Fire grate and gas equipment

Abstract

The utility model discloses a fire grate and gas equipment, and relates to the technical field of combustion. Wherein the fire grate comprises a shell, a combustion cover and a metal net, and an airflow channel is formed in the shell; the combustion cover is arranged at the top of the shell and provided with a plurality of first fire holes communicating with the airflow channel. A plurality of first riveting parts are arranged on the top surface of the combustion cover; the metal net is arranged on the upper surface of the combustion cover and covers the first fire holes. The metal net is pressed and fixed to the upper surface of the combustion cover through the first riveting parts. According to the technical scheme, the height of flames can be reduced, the flames are uniform, and the purposes of sufficient combustion and reduction of nitrogen oxide emission are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of combustion, in particular to a fire grate and a gas device. Background Art

[0002] The burner is the core component of gas equipment.

[0003] In the related art, the flame intensity of the burner is high, and the flue gas emitted by instantaneous combustion has poor performance, resulting in high nitrogen oxides and failing to meet the low nitrogen emission performance requirements. Utility Model Content

[0004] The main purpose of the utility model is to provide a fire grate, which is intended to reduce the flame height and make the flame uniform so as to achieve full combustion and reduce nitrogen oxide emissions.

[0005] To achieve the above-mentioned purpose, the fire grate proposed in the present invention comprises:

[0006] a housing having an air flow channel formed therein;

[0007] a combustion cover, disposed on the top of the shell and provided with a plurality of first fire holes communicating with the air flow channel; a top surface of the combustion cover is provided with a plurality of first riveted portions; and

[0008] A metal mesh is provided on the upper surface of the combustion cover and covers the plurality of first fire holes; and the plurality of first rivets press and fix the metal mesh to the upper surface of the combustion cover.

[0009] In one embodiment of the present application, the combustion cover includes a panel extending from one end to the other end in the longitudinal direction of the shell, and the plurality of first fire holes are spaced apart along the longitudinal direction of the panel; the metal mesh is provided on the upper surface of the panel;

[0010] The plurality of first riveting portions are respectively located on both sides of the width of the panel to respectively clamp the two side edges of the surface of the metal mesh away from the panel.

[0011] In one embodiment of the present application, the combustion cover further includes two side plates respectively provided on both sides of the panel in the width direction, and both side plates are bent relative to the panel toward the back side of the panel to be inserted into the air flow channel;

[0012] The first riveted portions on both sides are connected to the two side plates respectively.

[0013] In one embodiment of the present application, the first riveting portion includes:

[0014] a connecting portion, one end of which is connected to the upper edge of the side plate and the other end of which extends upward in a direction away from the side plate; and

[0015] The clamping portion is connected to one end of the connecting portion away from the side plate and is arranged opposite to the panel to form a clamping space for fixing the metal mesh.

[0016] In one embodiment of the present application, the metal mesh is welded to portions of the panel at both ends in the length direction where the first fire holes are not provided.

[0017] In one embodiment of the present application, the first riveted portion and the combustion cover are an integrally formed structure.

[0018] In one embodiment of the present application, the panel has a hollow area, and the panel is provided with a plurality of first dividing ribs extending along the width direction of the panel in the hollow area, and the plurality of first dividing ribs are arranged at intervals along the length direction of the panel to divide the hollow area into a plurality of first fire holes arranged at intervals along the length direction of the panel;

[0019] The panel is provided with a second dividing rib extending along the length direction of the panel at the first fire hole, and the second dividing rib divides the first fire hole into two first sub-fire holes; two adjacent second dividing ribs are staggered in the width direction of the panel.

[0020] In one embodiment of the present application, a rectifying plate is further included below the panel, wherein side plates are respectively provided on both sides of the rectifying plate in the width direction, and the two side plates are inserted between the two side plates; a plurality of rectifying holes are provided on the rectifying plate;

[0021] A plurality of second riveted portions are provided on one end of the side plate away from the panel, and the plurality of second riveted portions clamp the rectifying plate and the two side plates in the combustion cover.

[0022] In one embodiment of the present application, the shell includes two side shell walls respectively located outside the two side plates, each of the side shell walls is provided with a plurality of convex bumps protruding outward, the plurality of convex bumps are arranged at intervals along the length direction of the shell, and a cavity connected to the airflow channel is formed between each convex bump and the adjacent side plate, and the top of the cavity is open to form a second fire hole;

[0023] The total area of ​​the rectifying holes is defined as S1, and the total area of ​​all the first fire holes and the second fire holes is defined as S, satisfying: 0.3≤S1 / S≤0.45.

[0024] To achieve the above objectives, the present application also provides a gas device, including the above-mentioned fire grate.

[0025] In the fire grate of the present invention, an airflow channel is formed in the shell, and a combustion cover with multiple first fire holes is provided on the top of the shell, so that airflow can be ejected from the multiple first fire holes for combustion; a metal mesh is provided on the upper surface of the combustion cover, and the metal mesh can cover the multiple first fire holes, and multiple first riveted parts are provided on the upper surface of the combustion cover, and the metal mesh is crimped and fixed to the upper surface of the combustion cover by using the multiple first riveted parts, so as to increase the combustion area, break up the airflow, make the combustion more uniform and stable, and prevent backfire, so as to achieve the purpose of full combustion and reduce nitrogen oxide emissions. In addition, the metal mesh is fixed by riveting, which can reduce the welding position between the metal mesh and the combustion cover and improve the thermal deformation problem of the metal mesh and the combustion cover during the welding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0027] Figure 1 This is a structural diagram of an embodiment of the fire grate of the present utility model;

[0028] Figure 2 This is a schematic diagram of the explosion structure of an embodiment of the fire grate of the present utility model;

[0029] Figure 3 This is a schematic diagram of the explosion structure of the metal mesh, combustion cover and rectifier plate in the embodiment of the utility model;

[0030] Figure 4 for Figure 1 A top view of an embodiment;

[0031] Figure 5 for Figure 1 Cross-sectional view of an embodiment;

[0032] Figure 6 This is a schematic diagram of the assembly structure of the metal mesh, combustion cover and rectifying plate in the embodiment of the present utility model;

[0033] Figure 7 for Figure 6 Bottom view of

[0034] Figure 8 It is a bottom view of the combustion cover in the embodiment of the present utility model.

[0035] Description of Figure Numbers:

[0036]

[0037]

[0038] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0040] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0041] At the same time, the meaning of "and / or" or "and / or" appearing in the full text includes three options. Taking "A and / or B" as an example, it includes option A, or option B, or an option in which both A and B are satisfied.

[0042] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features specified as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0043] The burner is the core component of gas equipment, equipped with a flame grate. Traditional burner structures typically achieve flame stabilization by changing the shape of the flame outlet. However, the rapid exhaust velocity can easily lead to excessively high flames, incomplete combustion, and high nitrogen oxide emissions.

[0044] To this end, the utility model proposes a fire grate, which aims to reduce the flame intensity and stabilize the flame by covering the fire hole with a metal mesh, and fix the metal mesh by riveting, reducing the welding process and avoiding thermal deformation problems.

[0045] In the embodiment of the present utility model, Figures 1 to 5 As shown, the fire bar includes a shell 1, a combustion cover 2 and a metal mesh 3.

[0046] An air flow channel is formed in the shell 1; the combustion cover 2 is arranged on the top of the shell 1 and is provided with a plurality of first fire holes 201 connected to the air flow channel, and the top surface of the combustion cover 2 is provided with a plurality of first rivet parts 23; the metal mesh 3 is arranged on the upper surface of the combustion cover 2 and covers the plurality of first fire holes 201; the plurality of first rivet parts 23 crimp the metal mesh 3 to the upper surface of the combustion cover 2.

[0047] It can be understood that the combustion cover 2 is arranged on the top of the shell 1 of the fire bar, and the air inlet 101 of the air flow channel in the shell 1 is connected to the air flow source. The air flow source includes air and gas. The gas and air enter the air flow channel from the air inlet 101, and after being pre-mixed in the air flow channel, they are ejected through the multiple first fire holes 201 on the combustion cover 2 and ignited to form a combustion flame. Optionally, the specific structure of the combustion cover 2 can be determined according to actual conditions. For example, it can be a plate structure, a U-shaped structure or other shape structures. The combustion cover 2 can be made of high-temperature resistant sheet metal. The multiple first fire holes 201 are distributed at intervals, which can play a role in equalizing the flow, so that the air flow is more uniform when ejected. Optionally, the first fire holes 201 can be circular holes, square holes, triangular holes, strip holes or other irregular shaped holes.

[0048] The metal mesh 3 is arranged on the upper surface of the combustion cover 2 and covers the multiple first fire holes 201, playing the role of breaking up the airflow so that the mixed gas can fully burn after being ignited, forming a stable and uniform flame. Optionally, the metal mesh 3 is made of a high-temperature resistant material, such as an iron-chromium-aluminum material. Optionally, the number of layers of the metal mesh 3 can be multiple layers. The multi-layer metal mesh 3 can further break up the air and gas so that the gas and air can be mixed evenly. At the same time, the multi-layer metal mesh 3 can increase the resistance and play a better anti-backfire effect. In actual application, the number of layers of the metal mesh 3 is related to the mesh number of the metal mesh 3. The metal mesh 3 with a large mesh number has fewer layers, and the metal mesh 3 with a small mesh number has more layers. For example, the number of layers of the metal mesh 3 can be 2 to 10 layers, specifically 2 layers, 3 layers, 4 layers, 5 layers, 6 layers, 7 layers, 8 layers, 9 layers or 10 layers. The mesh number of the metal mesh 3 can be 20 meshes to 100 meshes, specifically 20 meshes, 40 meshes, 50 meshes, 60 meshes, 80 meshes or 100 meshes.

[0049] It should be noted that in the related art, the metal mesh 3 is disposed below the combustion cover 2. Typically, the upper surface of the metal mesh 3 has a rib structure. When the fire grate is operating, the rib structure above the metal mesh 3 directly contacts the flame, which can easily cause problems such as rib burnout and flashback. In this embodiment, the metal mesh 3 is disposed on the upper surface of the combustion cover 2. Therefore, when the fire grate is operating, the flame burns directly on the surface of the metal mesh 3. Compared to the related art in which the metal mesh 3 is disposed below the combustion cover 2, this prevents flashback from causing safety accidents such as explosions.

[0050] In this embodiment, the top surface of the combustion cover 2 is provided with a plurality of first rivet portions 23. During assembly, the metal mesh 3 can be first stacked on the upper surface of the combustion cover 2 to cover the plurality of first fire holes 201. The metal mesh 3 is then crimped and fixed to the upper surface of the combustion cover 2 via the plurality of first rivet portions 23, thereby achieving the assembly function of the metal mesh 3 and the combustion cover 2. This design can reduce the number of welds between the metal mesh 3 and the combustion cover 2 and improve the thermal deformation problem of the metal mesh 3 and the combustion cover 2 during the welding process.

[0051] It is understandable that the metal mesh 3 can be consistent with the extension direction of the top surface of the combustion cover 2, and the specific positions of the multiple first rivet parts 23 can be determined according to actual conditions. For example, they can be set on a single side or on two opposite sides of the combustion cover 2. When set on a single side, multiple first rivet parts 23 can be set at intervals on the long side of the combustion cover 2 to limit and fix the long side of the metal mesh 3; when set on two opposite sides of the combustion cover 2, multiple first rivet parts 23 can be set on the two long sides of the combustion cover 2 respectively to limit and fix the two long sides of the metal mesh 3. Of course, in some embodiments, the first rivet parts 23 can also be set on the short side of the combustion cover 2 to limit and fix the short side of the metal mesh 3.

[0052] Optionally, the specific structure of the first riveted portion 23 may be a rivet structure, a flange structure, a claw structure or some other structure, as long as it can rivet the metal mesh 3 toward the upper surface of the combustion cover 2 .

[0053] Optionally, the first riveted portion 23 and the combustion cover 2 may be an integrally formed structure or a separately formed structure.

[0054] In summary, in the fire grate of the technical solution of the present invention, an air flow channel is formed in the shell 1, and a combustion cover 2 with multiple first fire holes 201 is provided on the top of the shell 1, so that the air flow can be ejected from the multiple first fire holes 201 for combustion; a metal mesh 3 is provided on the upper surface of the combustion cover 2, and the metal mesh 3 can cover the multiple first fire holes 201, and by providing multiple first rivet parts 23 on the upper surface of the combustion cover 2, the metal mesh 3 is crimped and fixed to the upper surface of the combustion cover 2 using the multiple first rivet parts 23, thereby increasing the combustion area, breaking up the air flow, making the combustion more uniform and stable, and preventing backfire, so as to achieve the purpose of full combustion and reducing nitrogen oxide emissions. In addition, the metal mesh 3 is fixed by riveting, which can reduce the welding position between the metal mesh 3 and the combustion cover 2 and improve the thermal deformation problem of the metal mesh 3 and the combustion cover 2 during the welding process.

[0055] In one embodiment of the present application, Figures 1 to 4 The combustion cover 2 includes a panel 21 extending from one end to the other end in the length direction of the shell 1, and a plurality of first fire holes 201 are spaced apart along the length direction of the panel 21; a metal mesh 3 is provided on the upper surface of the panel 21; a plurality of first riveted portions 23 are respectively located on both sides of the width of the panel 21 to respectively clamp the two side edges of the surface of the metal mesh 3 away from the panel 21.

[0056] In this embodiment, the panel 21 is positioned within the housing 1 and extends from one end to the other in the longitudinal direction of the housing 1. Multiple first flame holes 201 are spaced apart along the length of the panel 21, increasing the airflow outlet area and reducing flame intensity. It will be appreciated that the panel 21 also supports the metal mesh 3, allowing it to be placed on the upper surface of the panel 21 and then secured in place by multiple first rivets 23 on both sides of the width of the panel 21, thereby improving the assembly reliability of the metal mesh 3.

[0057] In addition, multiple first riveted portions 23 are arranged on both sides of the width of the panel 21 to respectively clamp the two side edges of the surface of the metal mesh 3 facing away from the panel 21. It can be understood that multiple first riveted portions 23 respectively limit the two relatively long side edges of the metal mesh 3. Such a design, on the one hand, can make the force on both sides of the width of the metal mesh 3 balanced, not easy to warp, and ensure the flatness of the metal mesh 3; on the other hand, it can avoid the first riveted portions 23 blocking the main air outlet area in the middle of the metal mesh 3 to ensure the air outlet area.

[0058] To further enhance the flame-stabilizing effect of the metal mesh 3, the metal mesh 3 may cover as much of the upper surface of the panel 21 as possible to ensure that all of the multiple first flame holes 201 are covered. In this manner, in addition to covering the multiple first flame holes 201, the metal mesh 3 may also cover the areas at both ends of the panel 21 along its length, excluding those where the first flame holes 201 are located. In this case, the metal mesh 3 may be welded to the ends of the panel 21 to limit the length of the metal mesh 3. This further enhances the assembly reliability of the metal mesh 3 and prevents warping of the ends of the metal mesh 3 along its length.

[0059] Furthermore, if Figures 2 to 5 The combustion cover 2 also includes two side panels 22 respectively arranged on both sides of the panel 21 in the width direction. Both side panels 22 are bent relative to the panel 21 toward the back of the panel 21 to be inserted into the air flow channel; the first rivet portions 23 on both sides are respectively connected to the two side panels 22.

[0060] It can be understood that the combustion cover 2 includes a panel 21 and two side panels 22. The two side panels 22 are connected to the two sides of the panel 21 to roughly form a "∩"-shaped structure. When applied to the fire bar, the panel 21 is set on the top of the shell 1, and the two side panels 22 are inserted in the air flow channel and fixed to the two side walls 11 of the shell 1 respectively. In actual applications, the panel 21 and the two side panels 22 can be formed separately and then welded and fixed, or they can be formed as a whole by bending sheet metal parts. The metal mesh 3 is stacked on the upper surface of the panel 21, and the two side edges of the metal mesh 3 are limited by the first riveted parts 23 provided on the two side panels 22, which is beneficial to the stability and overall consistency of the assembly of the metal mesh 3 and the combustion cover 2, and is beneficial to improving the combustion stability.

[0061] It should be noted that the first riveted portion 23 and the side plate 22 can be formed as one piece, or the first riveted portion 23 and the side plate 22 can be connected and fixed after the metal mesh 3 is stacked on the front of the panel 21, as long as it is ensured that the first riveted portion 23 can finally abut against the side edge of the metal mesh 3 facing away from the panel 21.

[0062] Specifically, if Figures 3 to 5 The first riveted portion 23 includes a connecting portion 231 and a clamping portion 232. One end of the connecting portion 231 is connected to the upper edge of the side plate 22, and the other end extends upward in a direction away from the side plate 22; the clamping portion 232 is connected to the end of the connecting portion 231 away from the side plate 22, and is arranged opposite to the panel 21 to form a clamping space for fixing the metal mesh 3.

[0063] This embodiment illustrates the structure of the first riveted portion 23. The connecting portion 231 connects the support panel 21 and the clamping portion 232, allowing the clamping portion 232 to be spaced apart from the panel 21 to form a clamping space, allowing the metal mesh 3 to be clamped between the clamping portion 232 and the panel 21 for assembly and fixation. Optionally, the connecting portion 231 can be integrally formed with the side panel 22, with the connecting portion 231 extending upward from the upper edge of the side panel 22; the clamping portion 232 can also be formed by bending the upper edge of the connecting portion 231 into an integral shape. This can simplify the molding process and improve production efficiency.

[0064] Optionally, the connecting portion 231 and the holding portion 232 are in a right-angle structure, so that the structural strength of the first riveted portion 23 is stronger, thereby further improving the limiting strength of the metal mesh 3.

[0065] In order to further improve the flame stabilization effect of the fire grate, Figure 2 、 Figure 3 as well as Figure 8 In one embodiment of the present application, the panel 21 has a hollow area, and the panel 21 is provided with a plurality of first dividing ribs 211 extending along the width direction of the panel 21 in the hollow area. The plurality of first dividing ribs 211 are arranged at intervals along the length direction of the panel 21 to divide the hollow area into a plurality of first fire holes 201 arranged at intervals along the length direction of the panel 21.

[0066] In this embodiment, the hollowed-out area of ​​the panel 21 is connected to the airflow channel of the housing 1. A plurality of first dividing ribs 211 extending along the width of the hollowed-out area are provided. These first dividing ribs 211 are spaced apart along the length of the panel 21, dividing the hollowed-out area into a plurality of first flame holes 201. It is understood that the first dividing ribs 211 not only strengthen the structure, but also separate the plurality of first flame holes 201 and disperse the airflow. The plurality of first flame holes 201 are spaced apart along the length of the panel 21, providing uniform airflow and ensuring more stable flame combustion.

[0067] Furthermore, if Figure 8 The panel 21 is provided with a second dividing rib 212 extending along the length direction of the panel 21 at the first fire hole 201. The second dividing rib 212 divides the first fire hole 201 into two first sub-fire holes 201a.

[0068] By setting a second dividing rib 212 at the first fire hole 201, the second dividing rib 212 further divides the first fire hole 201 into two first sub-fire holes 201a with smaller areas, thereby further breaking up the airflow, making the airflow distribution more uniform and the combustion more complete.

[0069] Furthermore, if Figure 8The two adjacent second dividing ribs 212 are staggered in the width direction of the panel 21 .

[0070] This arrangement ensures that the two first sub-fire holes 201a within the same first fire hole 201 have different areas, and that the first sub-fire holes 201a of different areas are alternately arranged along the length of the panel 21. This not only increases the overall fire output area, but also reduces the airflow velocity through the smaller first sub-fire holes 201a, thereby lowering the flame height and stabilizing the flame, ensuring more complete combustion and reducing nitrogen oxide emissions. This also reduces combustion noise.

[0071] On this basis, the metal mesh 3 is arranged above the plurality of first separation ribs 211 and the second separation ribs 212 and is fixed in position by the plurality of first riveted portions 23 above.

[0072] In one embodiment of the present application, Figure 2 、 Figure 3 as well as Figures 5 to 7 The fire grate also includes a rectifying plate 4 located below the panel 21. Side panels 41 are provided on both sides of the rectifying plate 4 in the width direction. The two side panels 41 are inserted between the two side panels 22. A plurality of rectifying holes 401 are provided on the rectifying plate 4. A plurality of second rivet portions 24 are provided on the end of the side panel 22 away from the panel 21. The plurality of second rivet portions 24 clamp the rectifying plate 4 and the two side panels 41 in the combustion cover 2.

[0073] A rectifying plate 4 is spaced below the panel 21, ensuring that the airflow passes through the rectifying plate 4 before entering the first flame hole 201 of the combustion cover 2. As will be appreciated, a mixing chamber is formed between the rectifying plate 4 and the combustion cover 2. The airflow is dispersed and divided by the multiple rectifying holes 401 of the rectifying plate 4, where it mixes and decelerates within the mixing chamber, thereby reducing the velocity of the airflow out of the first flame hole 201 and preventing flameout.

[0074] The rectifier plate 4 has two side panels 41 on both sides, and the two side panels 41 can play the role of installing and fixing the rectifier plate 4 and increasing the structural strength of the rectifier plate 4. By setting a plurality of second rivet parts 24 at the end of the side panel 22 away from the panel 21, the plurality of second rivet parts 24 can clamp the rectifier plate 4 and the two side panels 41 in the combustion cover 2, thereby realizing the assembly function of the rectifier plate 4 and the combustion cover 2. In actual application, the two side panels 41 of the rectifier plate 4 can be inserted between the two side panels 22 first, and then the lower surface of the rectifier plate 4 can be clamped by the second rivet parts 24, so that the rectifier plate 4 and the two side panels 41 are fixed in the combustion cover 2. Such a design can reduce the welding position between the rectifier plate 4 and the combustion cover 2, and improve the thermal deformation problem of the rectifier plate 4 and the combustion cover 2 during the welding process.

[0075] Alternatively, the second riveted portion 24 may be a rivet buckle structure, a flange structure, a claw structure, or some other structure. In this embodiment, the structure of the second riveted portion 24 is the same as that of the first riveted portion 23, which facilitates molding and processing. Optionally, the second riveted portion 24 and the side panel 22 are integrally formed, and the second riveted portion 24 may be formed by bending the lower edge of the side panel 22.

[0076] Optionally, a plurality of second rivet portions 24 may be arranged at intervals along the length direction of the side plate 22 , so that the rectifier plate 4 is subjected to uniform force, thereby improving the installation reliability of the rectifier plate 4 .

[0077] In this embodiment, during assembly, the rectifying plate 4 can be first installed on the combustion cover 2, and then the whole can be inserted into the housing 1, which simplifies the assembly structure and improves the installation efficiency.

[0078] Furthermore, if Figure 1 、 Figure 2 、 Figure 4 as well as Figure 5 The shell 1 includes two side shell walls 11 located on the outside of the two side plates 22 respectively. Each side shell wall 11 is provided with a plurality of convex bumps 111 protruding outward. The plurality of convex bumps 111 are arranged at intervals along the length direction of the shell 1. A cavity connected to the air flow channel is formed between each convex bump 111 and the adjacent side plate 22. The top of the cavity is open to form a second fire hole 102.

[0079] In this embodiment, the housing 1 includes two opposing side walls 11. These two side walls 11 are formed by press-forming to form an air inlet 101, an air outlet, and an airflow channel connecting the air inlet 101 and the air outlet. The air inlet 101 is typically located on the side of the bottom of the housing 1, while the air outlet is typically located on the top surface of the housing 1. During assembly, the combustion cover 2 is inserted into the air outlet, with the panel 21 and metal mesh 3 positioned opposite the air outlet. Side panels 22 are positioned on the inner sides of the two side walls 11, respectively. The side walls 11 and adjacent side panels 22 can be secured by welding. Alternatively, the side walls 11 may be sheet metal.

[0080] Each side shell wall 11 is equipped with multiple outwardly projecting bumps 111. A cavity connected to the airflow channel is formed between the bumps 111 and the adjacent side panels 22. The top of the cavity is open to form second flame holes 102. When the fire grate burns, part of the mixed gas in the airflow channel flows to the metal mesh 3 for combustion, while part of the mixed gas passes through the cavity of the bumps 111 and burns at the second flame holes 102. Providing second flame holes 102 on both sides allows for more efficient use of the space on both sides, increasing the combustion area. Furthermore, the higher flow rate of the second flame holes 102 on both sides, combined with the flame-stabilizing effect of the intermediate metal mesh 3, can further reduce nitrogen oxide emissions.

[0081] Furthermore, the total area of ​​the rectifying holes 401 is defined as S1, and the total area of ​​all the first flame holes 201 and the second flame holes 102 is defined as S, satisfying: 0.3≤S1 / S≤0.45.

[0082] It is understandable that the airflow in the airflow channel first passes through the multiple rectifying holes 401 before being discharged from the first and second flame holes 201, 102. The rectifying holes 401 can divert and reduce the speed of the airflow, and the total area S1 of the rectifying holes 401 will be smaller than the total area S of all the first and second flame holes 201, 102. In practical applications, the ratio of the total area S1 of the rectifying holes 401 to the total area S of all the first and second flame holes 201, 102 should not be too small or too large. If it is too small, it may lead to excessive flow resistance, resulting in too little air output and easy flameout; if it is too large, the air output flow rate may be too fast, resulting in flameout. Based on this, in this embodiment, the ratio of the total area S1 of the rectifying holes 401 to the total area S of all the first and second flame holes 201, 102 is set to meet 0.3≤S1 / S≤0.45, ensuring a balance between flow resistance and rectification uniformity, thereby achieving better flame stabilization and reducing nitrogen oxide emissions.

[0083] Optionally, the number of the rectifying holes 401 can be determined according to actual conditions, for example, it can be a dozen, twenty or other numbers; the shape of the rectifying holes 401 can be determined according to actual conditions, for example, it can be a strip hole, a circular hole, a triangular hole or a hole structure of other shapes.

[0084] The present invention also proposes a gas device, which includes a fire grate. The specific structure of the fire grate refers to the above-mentioned embodiment. Since the gas device adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0085] As an example, the gas equipment may be a burner, such as a premix burner, a rich-lean burner, a water-cooled burner, and the like.

[0086] As an example, the gas equipment may also be a gas water heater, boiler or other equipment.

[0087] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A fire grate, characterized in that: include: a housing having an air flow channel formed therein; a combustion cover, disposed on the top of the shell and provided with a plurality of first fire holes communicating with the air flow channel; a top surface of the combustion cover is provided with a plurality of first riveted portions; and A metal mesh is provided on the upper surface of the combustion cover and covers the plurality of first fire holes; and the plurality of first rivets press and fix the metal mesh to the upper surface of the combustion cover.

2. The fire bar according to claim 1, characterized in that: The combustion cover includes a panel extending from one end to the other end in the longitudinal direction of the shell, and a plurality of the first fire holes are spaced apart along the longitudinal direction of the panel; the metal mesh is provided on the upper surface of the panel; The plurality of first riveting portions are respectively located on both sides of the width of the panel to respectively clamp the two side edges of the surface of the metal mesh away from the panel.

3. The fire bar according to claim 2, characterized in that: The combustion cover further includes two side plates respectively provided on both sides of the panel in the width direction, and both side plates are bent relative to the panel toward the back of the panel to be inserted into the air flow channel; The first riveted portions on both sides are connected to the two side plates respectively.

4. The fire bar according to claim 3, characterized in that: The first riveting portion includes: a connecting portion, one end of which is connected to the upper edge of the side plate and the other end of which extends upward in a direction away from the side plate; and The clamping portion is connected to one end of the connecting portion away from the side plate and is arranged opposite to the panel to form a clamping space for fixing the metal mesh.

5. The fire bar according to claim 2, wherein: The metal mesh is welded to the portions of the panel at both ends in the length direction where the first fire holes are not provided.

6. The fire bar according to any one of claims 1 to 5, characterized in that: The first riveted portion and the combustion cover are an integrally formed structure.

7. The fire bar according to any one of claims 2 to 5, characterized in that The panel has a hollow area, and the panel is provided with a plurality of first dividing ribs extending along the width direction of the panel in the hollow area, and the plurality of first dividing ribs are arranged at intervals along the length direction of the panel to divide the hollow area into a plurality of first fire holes arranged at intervals along the length direction of the panel; The panel is provided with a second dividing rib extending along the length direction of the panel at the first fire hole, and the second dividing rib divides the first fire hole into two first sub-fire holes; two adjacent second dividing ribs are staggered in the width direction of the panel.

8. The fire bar according to claim 3 or 4, characterized in that: It also includes a rectifying plate located below the panel, with side plates respectively provided on both sides of the rectifying plate in the width direction, and the two side plates are inserted between the two side plates; the rectifying plate is provided with a plurality of rectifying holes; A plurality of second riveted portions are provided on one end of the side plate away from the panel, and the plurality of second riveted portions clamp the rectifying plate and the two side plates in the combustion cover.

9. The fire bar according to claim 8, characterized in that The shell includes two side shell walls respectively located outside the two side plates, each of the side shell walls is provided with a plurality of convex bumps protruding outward, the plurality of convex bumps are arranged at intervals along the length direction of the shell, and a cavity connected to the air flow channel is formed between each convex bump and the adjacent side plate, and the top of the cavity is open to form a second fire hole; The total area of ​​the rectifying holes is defined as S1, and the total area of ​​all the first fire holes and the second fire holes is defined as S, satisfying: 0.3≤S1 / S≤0.

45.

10. A gas equipment, characterized in that: Comprising the fire bar according to any one of claims 1 to 9.

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