Fire grate and gas equipment

Abstract

The utility model discloses a fire grate and gas equipment, and relates to the technical field of gas equipment. Wherein the fire grate comprises a drainage section, a transition section and a mixing section which are sequentially connected from bottom to top, and the transition section is connected between the drainage section and the mixing section in a necking shape; a main fire outlet hole is formed in the top of the mixing section; and at least one expanded cavity is formed in the mixing section along the flowing path of the air flow. According to the technical scheme, flames can be uniform, the height of the flames is reduced, combustion is more sufficient, and emission of nitric oxide is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of gas equipment, in particular to a fire grate and gas equipment. 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 aims to reduce the flame height, ensure complete combustion and reduce the emission of nitrogen oxides.

[0005] To achieve the above-mentioned purpose, the fire grate proposed in the present invention comprises a drainage section, a transition section and a mixing section connected in sequence from bottom to top, wherein the transition section is connected between the drainage section and the mixing section in a necked shape; a main fire outlet is provided at the top of the mixing section;

[0006] At least one expansion cavity is provided in the mixing section along the path of the air flow.

[0007] In one embodiment of the present application, the side wall of the mixing section is provided with a convex bulge protruding outward to form a first expansion cavity.

[0008] In one embodiment of the present application, the fire grate further includes a diversion component provided in the mixing section, the diversion component divides the flow channel in the mixing section into multiple diversion channels in the width direction of the fire grate, and the multiple diversion channels are all connected to the main fire outlet.

[0009] In one embodiment of the present application, a second expansion cavity is provided at the outlet of at least one of the diversion channels, and the width of the second expansion cavity is greater than that of the corresponding diversion channel.

[0010] In one embodiment of the present application, the plurality of diversion channels include a plurality of first diversion channels and a plurality of second diversion channels, the width of the first diversion channels is smaller than the width of the second diversion channels, and the second expansion cavity is formed at the outlet of the first diversion channels.

[0011] In one embodiment of the present application, the diverter component includes a plurality of diverter plates spaced apart along the width direction of the mixing section;

[0012] The two outermost diverter plates are spaced apart from the sidewalls of the corresponding mixing sections to form the first diverter channel; and / or the two adjacent diverter plates in the middle are spaced apart to form the first diverter channel;

[0013] The upper end of the diverter plate expands outward away from the corresponding first diverter channel to form the second expansion cavity.

[0014] In one embodiment of the present application, the fire bar further includes two flame stabilizing plates respectively provided on both sides of the mixing section in the width direction, the two flame stabilizing plates are respectively spaced apart from the two side walls of the mixing section to form a third flow channel, the side walls of the mixing section are provided with side air outlets connected to the third flow channel, and the top of the third flow channel is provided with side fire holes;

[0015] The flame stabilizing plate is provided with a recessed portion facing the third flow channel.

[0016] In one embodiment of the present application, the fire bar further includes a metal mesh covering the main fire outlet, and the metal mesh has at least two layers of mesh structure with different mesh sizes.

[0017] In one embodiment of the present application, the metal mesh includes a first metal mesh and a second metal mesh, the first metal mesh is wrapped around the outside of the second metal mesh, and the mesh number of the first metal mesh is greater than the mesh number of the second metal mesh.

[0018] To achieve the above objectives, the present application also provides a gas device, including the above-mentioned fire grate.

[0019] In the fire grate of the technical solution of the present invention, at least one expansion cavity is provided on the air flow path within the mixing section, so that the mixed air flow of gas and air can flow through at least one expansion cavity on the path to the main fire outlet. The expansion cavity is used to increase the flow cross-sectional area to reduce the speed, thereby realizing the speed reduction function of the mixed air flow, thereby reducing the speed of the air flow ejected from the main fire outlet, and further making the flame uniform, reducing the flame height, making the combustion more complete, and reducing the emission of nitrogen oxides. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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.

[0021] Figure 1 This is a structural diagram of an embodiment of the fire grate of the present utility model;

[0022] Figure 2 for Figure 1 A partial cross-sectional view of an embodiment at AA;

[0023] Figure 3 for Figure 2A schematic structural diagram of the diversion component in the embodiment;

[0024] Figure 4 for Figure 1 A partial cross-sectional view of another embodiment at AA;

[0025] Figure 5 for Figure 4 A schematic structural diagram of the diversion component in the embodiment;

[0026] Figure 6 This is a schematic structural diagram of the shell of the fire bar in an embodiment of the present utility model;

[0027] Figure 7 for Figure 6 A partial cross-sectional view at the middle BB;

[0028] Figure 8 This is a structural diagram of an embodiment of a metal mesh in an embodiment of the present utility model;

[0029] Figure 9 for Figure 8 A schematic structural diagram of the second metal mesh in the embodiment;

[0030] Figure 10 for Figure 8 Schematic diagram of the structure of the first metal mesh when it is unfolded in the embodiment.

[0031] Description of Figure Numbers:

[0032] Label name Label name 1 Fire broiler 103 Side fire hole 11 drainage segment 14 Diverter components 12 transition section 141 Manifold 13 Mixing section 142 Connecting plate 13a convex hull 142a vents 131 First expansion cavity 15 Metal mesh 132 Second expansion cavity 151 First Metal Mesh 133 The first diversion channel 152 Second metal mesh 134 Second diversion channel 16 Flame stabilizer 101 Main fire outlet 161 The third flow channel 102 Side air outlet 162 concavity

[0033] 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

[0034] 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 are within the scope of protection of the present invention.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] Based on this, the present invention proposes a fire grate 1, which aims to reduce the air flow velocity by setting an expansion cavity in the air flow channel of the fire grate near the fire outlet, so as to achieve uniform flame, reduce flame height, and fully reduce the production of nitrogen oxides through combustion.

[0040] In the embodiment of the present utility model, Figure 1 、 Figure 2 、 Figure 6 as well as Figure 7 As shown, the fire bar 1 includes a diversion section 11, a transition section 12 and a mixing section 13 connected in sequence from bottom to top. The transition section 12 is necked and connected between the diversion section 11 and the mixing section 13. A main fire outlet 101 is provided at the top of the mixing section 13. At least one expansion cavity is provided in the mixing section 13 along the path of the airflow.

[0041] The fire grate 1 is used on a burner, wherein the guide section 11 is provided with an air inlet connected to an air flow source for introducing gas and air, which can be initially mixed within the guide section 11. The transition section 12 is connected in a necked shape between the guide section 11 and the mixing section 13. It can be understood that the transition section 12 can serve as a guide, directing the gas and air mixture in the guide section 11 to the mixing section 13 for mixing there. The mixed airflow is ultimately ejected from the main fire outlet 101 at the top of the mixing section 13 and ignited, forming a combustion flame. Optionally, the guide section 11, transition section 12, and mixing section 13 can be integrally molded structures or split-molded structures. In this embodiment, considering the ease of molding, the side walls on the same side of the guide section 11, transition section 12, and mixing section 13 can be integrally molded, and then the two side panel structures are riveted and welded to form an airflow channel. Optionally, the main fire outlet 101 can include fire holes of the same or different areas and the same or different shapes.

[0042] Along the path of air flow, at least one expansion cavity is provided in the mixing section 13, so that the gas-air mixture flow injected into the mixing section 13 from the transition section 12 can pass through at least one expansion cavity on the path to the main fire outlet 101, and the expansion cavity can increase the flow cross-sectional area, that is, when the flow rate is constant, the expansion cavity can reduce the air flow velocity, thereby reducing the flow velocity of the gas-air mixture flow to the main fire outlet 101, reducing the air flow ejection speed, and reducing the flame height, making the combustion more complete and reducing the emission of nitrogen oxides.

[0043] It should be noted that the expansion cavity in this embodiment refers to an expansion cavity structure in the airflow path relative to the upstream flow channel. It is understood that the expansion cavity can be a cavity structure that is externally extended based on the original inner cavity of the mixing section 13, in which case the expansion cavity increases the width of the original inner cavity of the mixing section 13; alternatively, the expansion cavity can be an expansion cavity structure constructed within the original inner cavity of the mixing section 13, for example, a flared structure can be constructed at the flow channel outlet of the inner cavity of the mixing section 13. The specific location and structure of the expansion cavity can be determined according to actual conditions, as long as the expansion cavity can be formed in the airflow path to reduce the flow rate.

[0044] It is understandable that the number of expansion cavities can be determined according to actual conditions, for example, it can be one, two, three or more.

[0045] It can be seen from this that in the fire grate 1 of the technical solution of the present invention, by arranging at least one expansion cavity on the air flow path within the mixing section 13, the gas and air mixed flow can flow through at least one expansion cavity on the path to the main fire outlet 101. The expansion cavity is used to increase the flow cross-sectional area to reduce the speed, thereby realizing the function of reducing the speed of the mixed flow, thereby reducing the speed of the air flow ejected from the main fire outlet 101, and then being able to even out the flame, reduce the flame height, make the combustion more complete, and reduce the emission of nitrogen oxides.

[0046] In one embodiment of the present application, Figure 2 、 Figure 4 、 Figure 6 as well as Figure 7 The side wall of the mixing section 13 is provided with a convex bulge 13a protruding outward to form a first expansion cavity 131.

[0047] In this embodiment, a convex bulge 13a is provided on the side wall of the mixing section 13. The convex bulge 13a is provided to protrude outward relative to the original inner cavity of the mixing section 13, thereby forming a first expansion cavity 131 that expands outward relative to the original flow channel in the mixing section 13, thereby increasing the flow area. Therefore, when the airflow enters the mixing section 13 from the transition section 12, the airflow velocity can be effectively reduced when flowing through the first expansion cavity 131, so that the mixing of gas and air is more uniform.

[0048] Optionally, the convex hull 13a can be formed by extruding the sidewall of the mixing section 13 outward. In practical applications, the longitudinal cross-sectional shape of the convex hull 13a can be trapezoidal, circular, rectangular, or other shapes. In this embodiment, to avoid excessive wind resistance, the convex hull 13a can be configured as a convex hull structure with a trapezoidal or arc-shaped longitudinal cross-sectional shape. In this case, the connection between the convex hull 13a and the mixing section 13 is a smooth transition, which can avoid the formation of corners.

[0049] In one embodiment of the present application, Figures 2 to 5 The fire grate 1 also includes a diversion component 14 provided in the mixing section 13. The diversion component 14 divides the flow channel in the mixing section 13 into multiple diversion channels in the width direction of the fire grate 1. The multiple diversion channels are all connected to the main fire outlet 101.

[0050] In this embodiment, a diversion component 14 is provided in the mixing section 13. The diversion component 14 divides the flow channel in the mixing section 13 into a plurality of diversion channels in the width direction of the fire bar 1, so that when the airflow flows toward the main fire outlet 101, the diversion component 14 can generate resistance to the airflow, thereby reducing the airflow speed; at the same time, the diversion component 14 can also break up the airflow and divert it to different diversion channels, so that the airflow distribution is more uniform.

[0051] As an example, in combination with the first expansion cavity 131 provided in the aforementioned mixing section 13, the diverter component 14 can be arranged on the downstream side of the first expansion cavity 131, so that the airflow in the mixing section 13 can first be decelerated by passing through the first expansion cavity 131, and then decelerated by passing through the diverter component 14 and dispersed into multiple diverter channels, so that the airflow distribution is more uniform, thereby improving the uniformity of the flame distribution.

[0052] Furthermore, if Figures 2 to 5 A second expansion cavity 132 is provided at the outlet of at least one diversion channel, and the width of the second expansion cavity 132 is greater than that of the corresponding diversion channel.

[0053] By providing a second expansion cavity 132 at the outlet of at least one diversion channel, the airflow flowing out of the diversion channel can be decelerated in the second expansion cavity 132 , thereby further reducing the airflow velocity flowing to the main ignition hole 101 .

[0054] It can be understood that the second expansion cavity 132 is located at the outlet of the diversion channel, and the second expansion cavity 132 is located on the downstream side of the first expansion cavity 131. As a result, the airflow in the mixing section 13 can first be decelerated by the first expansion cavity 131, and then decelerated and dispersed into multiple diversion channels by the diversion component 14. Furthermore, after the airflow flows out of the diversion channel, it can also be decelerated by the second expansion cavity 132, thereby realizing multiple deceleration functions of the airflow velocity, reducing the intensity of the airflow ejection, and achieving the purpose of reducing the flame intensity.

[0055] Optionally, the second expansion cavity 132 may be provided at the outlet of one diversion channel, or the second expansion cavity 132 may be provided at the outlet of two or more diversion channels.

[0056] In one embodiment, if Figures 2 to 5 The plurality of diversion channels include a plurality of first diversion channels 133 and a plurality of second diversion channels 134 . The width of the first diversion channels 133 is smaller than that of the second diversion channels 134 . The second expansion cavity 132 is formed at the outlet of the first diversion channels 133 .

[0057] In this embodiment, the diversion component divides the airflow channel into multiple diversion channels of different widths, wherein the width of the first diversion channel 133 is smaller than the width of the second diversion channel 134, thereby forming a narrow channel structure in the first diversion channel 133, which can generate resistance to the airflow, thereby further reducing the speed of the airflow. On this basis, by arranging the second expansion cavity 132 at the outlet of the first diversion channel 133 with a relatively smaller width, compared to the method of arranging the second expansion cavity 132 at the outlet of the second diversion channel 134 with a relatively larger width, this embodiment increases the difference between the flow area of ​​the second expansion cavity 132 and the flow area of ​​the first diversion channel 133, that is, the flow area is expanded to a greater extent, thereby achieving a better airflow reduction effect.

[0058] Optionally, the number of the first diversion channels 133 may be determined according to actual conditions, such as two, three, four, five or more, etc. Correspondingly, the number of the second expansion cavities 132 may match the number of the first diversion channels 133 .

[0059] Optionally, the number of the second diversion channels 134 may be determined according to actual conditions, such as one, two, three, four or more.

[0060] In practical applications, the first diversion channels 133 and the second diversion channels 134 may be arranged alternately, regularly, or irregularly in the width direction of the mixing section 13 .

[0061] In practical applications, the second expansion cavity 132 may be formed by the structure of the diverter component 14 itself, or the second expansion cavity 132 may be formed by the diverter component 14 and the side wall of the mixing section 13 .

[0062] Specifically, if Figures 2 to 5 The diverter component 14 includes a plurality of diverter plates 141 spaced apart along the width direction of the mixing section 13; the two outermost diverter plates 141 are spaced apart from the side walls of the corresponding mixing section 13 to form a first diverter channel 133; and / or, the two adjacent diverter plates 141 in the middle are spaced apart to form a first diverter channel 133; wherein the upper end of the diverter plate 141 expands outward away from the corresponding first diverter channel 133 to form a second expansion cavity 132.

[0063] This embodiment illustrates the structure of the diverter component 14. The diverter component 14 includes a plurality of spaced-apart diverter plates 141. The two outermost diverter plates 141 may be spaced-apart from the sidewalls of the corresponding fire bar body 11 to form a first diverter channel 133. Alternatively, the first diverter channel 133 may be formed between two adjacent diverter plates 141. Of course, in some embodiments, a second diverter channel 134 may also be formed between two adjacent diverter plates 141.

[0064] It can be understood that whether the first diversion channel 133 or the second diversion channel 134 is formed in the diversion component 14 can be determined by the distance between two adjacent diversion plates 141, which can be determined according to actual conditions and is not limited here.

[0065] In this embodiment, the second expansion cavity 132 is formed by expanding the upper end of the diverter plate 141 away from the corresponding first diverter channel 133 , thereby simplifying the molding process and improving the assembly efficiency.

[0066] Furthermore, two adjacent diverter plates 141 can be connected by a connecting plate 142, which is provided with vent holes 142a to allow air to pass smoothly to the main fire outlet 101. This design, with a connecting plate 142 connected between each two adjacent diverter plates 141, allows multiple diverter plates 141 to be connected into a single integral component, making installation easier. In addition, the connection between the connecting plate 142 and the diverter plates 141 ensures the structural strength of the diverter component 14.

[0067] In one embodiment of the present application, Figure 1 、 Figure 2 as well as Figure 4 The fire grate 1 also includes two flame-stabilizing plates 16 respectively provided on both sides of the mixing section 13 in the width direction. The two flame-stabilizing plates 16 are respectively separated from the two side walls of the mixing section 13 to form a third flow channel 161. The side walls of the mixing section 13 are provided with side air outlets 102 connected to the third flow channel 161, and the top of the third flow channel 161 is provided with side fire holes 103; the flame-stabilizing plates 16 are provided with a recessed portion 162 facing the third flow channel 161.

[0068] In this embodiment, two flame-stabilizing plates 16 are respectively arranged on both sides of the mixing section 13. The two flame-stabilizing plates 16 can be welded or riveted to the corresponding side walls of the mixing section 13, and a third flow channel 161 is formed between each flame-stabilizing plate 16 and the corresponding side wall of the mixing section 13. It can be understood that the two flame-stabilizing plates 16 extend upward and protrude from the top of the fire grate 1, which can play the role of flame guidance and flame stabilization, so that the side flames are gathered toward the target area of ​​the fire grate 1, which is conducive to improving the heat accumulation effect during the combustion process. The airflow in the airflow channel can flow into the third flow channel 161 through the side air outlet 102, and then flow out from the side fire outlet 103 at the top, which can increase the air output of the fire grate 1 and make the combustion flame more stable.

[0069] By providing a recess 162 on the flame stabilizing plate 16 that is recessed toward the third flow channel 161 , the recess 162 can block the airflow in the third flow channel 161 to a certain extent, thereby reducing the flow velocity and making the flame more uniform and stable.

[0070] Furthermore, the side air outlet 102 can be set on the downstream side of the first expansion cavity 131, so that the airflow is first decelerated after passing through the first expansion cavity 131, and then enters the third flow channel 161 through the side air outlet 102, thereby further reducing the airflow ejection speed at the side fire hole 103, making the flame distribution more uniform.

[0071] In one embodiment of the present application, Figure 2 、 Figure 4 as well as Figures 8 and 9 The fire bar 1 further includes a metal mesh 15 covering the main fire outlet 101, and the metal mesh 15 has at least two layers of mesh structure with different mesh sizes.

[0072] It is understood that the metal mesh 15 is a mesh structure. The higher the mesh count of the metal mesh 15, the more holes per unit area and the smaller the pore size. The smaller the mesh count, the fewer holes per unit area and the larger the pore size. In this embodiment, the metal mesh 15 has at least two layers of mesh structures with different mesh counts along the direction of the airflow. The mesh holes in the at least two layers of mesh structures with different mesh counts are staggered. This not only increases the resistance to the airflow, thereby reducing its speed, but also further disperses the air and gas, ensuring a more uniform mixing of the gas and air, improving flame uniformity, and achieving a flame stabilization effect.

[0073] With such an arrangement, the airflow in the mixing section 13 can first be decelerated by the first expansion cavity 131, and then be decelerated and dispersed into multiple diversion channels by the diversion component 14. Furthermore, after the airflow flows out of the diversion channel, it can also be decelerated by the second expansion cavity 132, and then flow to the metal mesh 12 for further diversion and dispersion to reduce the speed, and then flow out from the main fire outlet 101 for combustion, thereby realizing the multiple deceleration functions of the airflow velocity, reducing the intensity of the airflow spray, and achieving the purpose of reducing the flame intensity.

[0074] In actual application, the number of layers of the metal mesh 15 can be 2, 3, 4, 5, 6, 7, 8, 9 or 10 layers, etc. The mesh number of the metal mesh 15 can be 20 to 100 mesh, specifically 20, 30, 40, 50, 60, 70, 80 or 100 mesh, etc. The metal mesh 15 of this embodiment has a mesh structure with at least two layers of different mesh numbers. For example, if the metal mesh 2 has two layers, the mesh number of one layer can be 20 mesh, and the mesh number of the other layer can be 30 mesh, 40 mesh or 50 mesh, etc.; if the metal mesh 15 has three layers, the mesh number of each layer can be different, or the mesh number of one layer can be different from the mesh numbers of the other two layers; if the metal mesh 15 has four or more layers, the mesh number of each layer can be different, or the mesh number of one layer can be different from the mesh number of the other layers, or the mesh number of two or three layers can be different from the mesh number of the other layers, etc. The specific number of layers and mesh size of the metal mesh 15 can be determined according to actual conditions and are not specifically limited here.

[0075] Further, if Figures 8 and 9 The metal mesh 15 includes a first metal mesh 151 and a second metal mesh 152 . The first metal mesh 151 is wrapped around the outside of the second metal mesh 152 . The mesh number of the first metal mesh 151 is greater than the mesh number of the second metal mesh 152 .

[0076] In this embodiment, the first metal mesh 151 is wrapped around the outside of the second metal mesh 152. Compared with other methods such as welding or clamping, this embodiment is simpler to operate and has higher assembly efficiency. In addition, it should be noted that since the larger the mesh number, the smaller the wire diameter of the metal mesh 15, the weaker the strength of the metal mesh 15; the larger the mesh number, the larger the wire diameter of the metal mesh 15, and the higher the strength of the metal mesh 15. Based on this, in this embodiment, the mesh number of the first metal mesh 151 is greater than the mesh number of the second metal mesh 152, and the strength of the second metal mesh 152 is higher than the strength of the first metal mesh 151. By wrapping the first metal mesh 151 with poor strength around the second metal mesh 152 with high strength, the second metal mesh 152 can support the first metal mesh 151, ensuring the overall structural strength of the first metal mesh 151 and the second metal mesh 152. As an example, the first metal mesh 151 can be a mesh structure with 2 to 4 layers of approximately 40 mesh, and the second metal mesh 152 can be a mesh structure with 1 to 2 layers of approximately 20 to 30 mesh.

[0077] 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.

[0078] As an example, the gas appliance may be a burner.

[0079] As an example, the gas equipment may also be a gas water heater, boiler or other equipment.

[0080] 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: It comprises a diversion section, a transition section and a mixing section which are sequentially connected from bottom to top, wherein the transition section is connected between the diversion section and the mixing section in a necked shape; a main fire outlet is provided on the top of the mixing section; At least one expansion cavity is provided in the mixing section along the path of the air flow.

2. The fire bar according to claim 1, characterized in that: The side wall of the mixing section is provided with a convex bulge protruding outward to form a first expansion cavity.

3. The fire bar according to claim 1, wherein: The fire grate further includes a diversion component provided in the mixing section, the diversion component divides the flow channel in the mixing section into a plurality of diversion channels in the width direction of the fire grate, and the plurality of diversion channels are all connected to the main fire outlet.

4. The fire bar according to claim 3, characterized in that: A second expansion cavity is provided at the outlet of at least one of the diversion channels, and the width of the second expansion cavity is greater than that of the corresponding diversion channel.

5. The fire bar according to claim 4, characterized in that: The plurality of diverter channels include a plurality of first diverter channels and a plurality of second diverter channels. The width of the first diverter channels is smaller than the width of the second diverter channels. The second expansion cavity is formed at the outlet of the first diverter channels.

6. The fire bar according to claim 5, characterized in that: The flow dividing component includes a plurality of flow dividing plates spaced apart along the width direction of the mixing section; The two outermost diverter plates are spaced apart from the sidewalls of the corresponding mixing sections to form the first diverter channel; and / or the two adjacent diverter plates in the middle are spaced apart to form the first diverter channel; The upper end of the diverter plate expands outward away from the corresponding first diverter channel to form the second expansion cavity.

7. The fire bar according to any one of claims 1 to 6, characterized in that The fire bar further includes two flame stabilizing plates respectively provided on both sides of the mixing section in the width direction, the two flame stabilizing plates are respectively spaced apart from the two side walls of the mixing section to form a third flow channel, the side walls of the mixing section are provided with side air outlets connected to the third flow channel, and the top of the third flow channel is provided with side fire holes; The flame stabilizing plate is provided with a recessed portion facing the third flow channel.

8. The fire bar according to any one of claims 1 to 6, characterized in that: The fire bar also includes a metal mesh covering the main fire outlet, and the metal mesh has at least two layers of mesh structures with different mesh sizes.

9. The fire bar according to claim 8, characterized in that The metal mesh includes a first metal mesh and a second metal mesh, the first metal mesh is wrapped around the outside of the second metal mesh, and the mesh number of the first metal mesh is greater than the mesh number of the second metal mesh.

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

Images