Inner fire cap for a burner and burner

Abstract

The utility model provides a kind of inner fire cover for combustor and combustor, it is related to combustor technical field, wherein, the inner fire cover for combustor includes inner fire cover body and mesh;Inner fire cover body is columnar, with opposite gas inlet end and fire outlet end;Fire outlet end has the steady flow recess that is recessed to the direction of gas inlet end, and the multiple flow holes that are communicated with gas inlet end and fire outlet end are opened in this steady flow recess;Mesh is provided with multiple fire outlet holes, and mesh cover is arranged at the opening of steady flow recess, and steady flow cavity is formed by being surrounded with steady flow recess.By the embodiment provided in the present application, the mixed gas of gas and primary air is injected into steady flow cavity from flow hole, the space suddenly expands, the flow rate significantly reduces, and multiple jets collide and mix in the space, realizing the secondary mixing of gas and air, forming a uniform and stable premixed gas flow, avoiding backfire, and the limited volume of steady flow cavity makes it difficult to have enough combustion space, so the backfire state cannot be maintained.

Description

Technical Field

[0001] This utility model relates to the field of burner technology, and in particular to an inner flame cap for a burner and a burner. Background Technology

[0002] In existing gas stoves, to improve thermal efficiency and heating uniformity, a dense cluster direct injection flame structure is often set in the center of the burner cap to fill the heating gap between the inner and outer ring flames of a traditional burner. Currently, there are two main ways to achieve dense cluster direct injection flames: one is to directly drill small-diameter flame holes in the copper burner cap. This method is difficult to process, and the thicker wall results in greater airflow resistance, affecting combustion performance; the other is to cover the burner cap with a porous metal mesh. Although this method reduces airflow resistance, the thin mesh wall is prone to backfire, especially when the primary air coefficient is high or during continuous combustion under high load.

[0003] Therefore, existing dense cluster direct injection fire structures suffer from problems such as easy backfire and insufficient combustion stability. Utility Model Content

[0004] This application addresses the shortcomings of existing methods by providing an inner flame cap and burner for a burner, thereby solving the technical problems of easy backfire and uneven combustion in existing dense cluster direct injection fire structures.

[0005] In the first aspect, embodiments of this application provide an inner flame cap for a burner, which mainly includes an inner flame cap body and a mesh; the inner flame cap body is columnar and has an inlet end and an outlet end opposite to each other; the outlet end has a flow-stabilizing recess recessed towards the inlet end, and a plurality of flow holes communicating with the inlet end and the outlet end are opened in the flow-stabilizing recess; the mesh has a plurality of outlet holes, and the mesh covers the opening of the flow-stabilizing recess and surrounds the flow-stabilizing recess to form a flow-stabilizing cavity.

[0006] As an optional implementation, the diameter of the flow orifice is larger than the diameter of the flame outlet orifice.

[0007] As an optional implementation, the spacing between the plurality of flow orifices is greater than the spacing between the plurality of flame outlet orifices.

[0008] As an optional implementation, the cross-sectional area of ​​the flow-stabilizing recess perpendicular to the axis of the inner flame cap body gradually decreases along the direction from the flame outlet end to the air inlet end.

[0009] As an optional implementation, the cross-section of the flow-stabilizing recess is circular; the axial cross-section of the flow-stabilizing recess is trapezoidal.

[0010] As an optional implementation, the plurality of flow holes are formed at the bottom of the flow stabilizing recess, and the bottom of the flow stabilizing recess is flat.

[0011] As an optional implementation, the flame outlet end of the inner flame cover body is also provided with an annular liquid accumulation groove that is recessed towards the air inlet end. The liquid accumulation groove is arranged around the outer periphery of the mesh, and the outer wall of the liquid accumulation groove is provided with a liquid discharge outlet.

[0012] As an optional implementation, the inner flame cover body also has a stepped portion formed along the outer side of the opening edge of the flow-stabilizing recess, the stepped portion being supported by the mesh.

[0013] As an optional implementation, the mesh is a metal mesh.

[0014] Secondly, embodiments of this application provide a burner including the inner flame cap as described in any of the foregoing embodiments.

[0015] This application provides an inner flame cap for a burner and a burner. The technical solution provided by the embodiments of this application brings at least the following beneficial effects: The mixture of fuel gas and primary air enters the inner burner cap body from the inlet end, and then is injected at a high velocity into the flow stabilizing cavity through the flow orifice. The space suddenly expands, the flow velocity decreases significantly, and multiple jets collide and mix within this space, achieving secondary mixing of the fuel gas and air. This process effectively eliminates localized non-uniformity in fuel gas concentration, forming a uniform and stable premixed airflow. This prevents backfire caused by excessive primary air in some areas leading to excessively rapid local combustion. Furthermore, the limited volume of the flow stabilizing cavity means that there is insufficient combustion space when backfire occurs, making it impossible to maintain the backfire state. The airflow flows out uniformly through the densely distributed flame outlets on the mesh, and after ignition, forms a dense and stable direct-injection flame covering the entire surface of the mesh.

[0016] The flow orifice diameter is larger than the flame outlet diameter, making the flow orifice easier to manufacture, while the flame outlet holes are small and dense, enabling dense cluster direct injection flames, thus improving thermal efficiency and heating uniformity.

[0017] The flow-stabilizing recess adopts a tapered design, which is conducive to the acceleration and stabilization of airflow and further suppresses the risk of backfire.

[0018] The liquid collection tank can collect overflow liquid and discharge it through the outlet, preventing liquid from entering the burner hole and affecting combustion, thus improving product lifespan and ease of cleaning.

[0019] The stepped section provides stable support and positioning for the mesh, ensuring structural reliability and ease of assembly.

[0020] Metal mesh is resistant to high temperatures and has uniform thermal conductivity, which is beneficial to flame stability and heat transfer.

[0021] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0022] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 This is a schematic diagram of the structure of an inner flame cap provided in an embodiment of this application; Figure 2 for Figure 1 A longitudinal cross-sectional schematic diagram; Figure 3 for Figure 1 Exploded view; Figure 4 This is a schematic diagram of the structure of the inner flame cover body in an embodiment of this application.

[0023] Figure labels and corresponding explanations: 1: Inner flame cap body; 11: Flow stabilizing recess; 12: Flow orifice; 13: Liquid collection tank; 14: Stepped section; 2: Mesh sheet; 21: Flame outlet; 22: Sheet body; 3: Steady flow cavity. Detailed Implementation

[0024] This application is described in detail below. Examples of embodiments of this application are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. Furthermore, detailed descriptions of known technologies that are unnecessary for the features of this application are omitted. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0025] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” and “the” used herein may also include the plural forms. It should be further understood that the term “comprising” as used in the specification of this application means the presence of the stated features, elements, and / or components, but does not exclude the presence or addition of one or more other features, elements, components, and / or groups thereof. The term “and / or” as used herein includes all or any units and all combinations thereof of one or more associated listed items.

[0026] like Figure 1-4As shown, this application embodiment provides an inner flame cap for a burner, which mainly includes an inner flame cap body 1 and a mesh 2. The inner flame cap body 1 is columnar and has an air inlet end and a flame outlet end. The flame outlet end has a flow stabilizing recess 11 recessed towards the air inlet end. Multiple flow holes 12 are opened in the flow stabilizing recess 11, which are connected to the air inlet end and the flame outlet end. The mesh 2 has multiple flame outlet holes 21. The mesh 2 covers the opening of the flow stabilizing recess 11 and forms a flow stabilizing cavity 3 with the flow stabilizing recess 11.

[0027] In this embodiment, the inner burner cap is positioned on a horizontal plane. The inner burner cap body 1 is cylindrical and is typically cast or machined from materials such as copper, aluminum alloy, or cast iron. The top end of the inner burner cap body 1 is the flame outlet, and the bottom end is the air inlet. A flow stabilizing recess 11 is located at the top and is recessed downwards. A flow orifice 12 passes through the flow stabilizing recess 11. Combustion gas flows in from the air inlet end of the inner burner cap body 1 and flows upwards, passing through the flow orifice 12 into the flow stabilizing recess 11, finally forming a flame at the flame outlet.

[0028] The mesh 2 includes a sheet 22, which is a circular or polygonal sheet structure. Multiple uniform flame outlet holes 21 are formed on the sheet 22 by laser drilling, etching, or stamping. The mesh 2 is adapted to the opening of the flow-stabilizing recess 11, with the opening of the flow-stabilizing recess 11 facing upwards. The mesh 2 horizontally covers the opening of the flow-stabilizing recess 11 and is fixed to the inner flame cap body 1 by means such as welding, fastening, or pressing. The mesh 2 and the inner wall of the flow-stabilizing recess 11 together form a flow-stabilizing cavity 3. This flow-stabilizing cavity 3 must be sufficiently small so that its limited volume can effectively suppress and maintain the generation of backfire.

[0029] The flow orifice 12 controls the flow rate, the mesh 2 controls the flame shape, and the flow stabilizing cavity 3 stabilizes the airflow and prevents backfire. More specifically, the mixture of fuel gas and primary air enters the inner burner cap body 1 from the inlet, and then is injected at a high speed into the flow stabilizing cavity 3 through the flow orifice 12. The space suddenly expands, the flow velocity decreases significantly, and multiple jets collide and mix within this space, achieving secondary mixing of the fuel gas and air. This process effectively eliminates localized non-uniformity in fuel gas concentration, forming a uniform and stable premixed airflow. This prevents backfire caused by excessive primary air in some areas leading to excessively fast local combustion. Furthermore, the limited volume of the flow stabilizing cavity 3 means that there is insufficient combustion space when backfire occurs, making it impossible to maintain the backfire state. The airflow flows out uniformly through the densely distributed flame outlets 21 on the mesh 2, and after ignition, forms a dense and stable direct-injection flame covering the entire surface of the mesh 2.

[0030] like Figure 3 As shown, in one optional implementation, the diameter of the flow orifice 12 is larger than the diameter of the flame outlet 21.

[0031] Based on the aforementioned embodiments, in this embodiment, the larger diameter flow orifice 12 is easier to process and reduces airflow resistance; the smaller diameter flame outlet orifice 21 can increase the flame density and air contact area, enhance contact with secondary air, and improve combustion efficiency.

[0032] like Figure 3 As shown, in one optional implementation, the spacing between the plurality of flow holes 12 is greater than the spacing between the plurality of flame outlet holes 21.

[0033] Based on the aforementioned embodiments, in this embodiment, the flow orifices 12 are arranged relatively sparsely to avoid mutual interference between multiple jets within the flow stabilizing cavity 3, which is beneficial for the uniform diffusion of the gas into the flow stabilizing cavity 3. The flame outlets 21 are densely distributed to ensure full flame coverage, eliminate heating blind spots, achieve a dense cluster direct injection flame pattern, and improve thermal efficiency.

[0034] like Figure 2 As shown, as an optional implementation, the cross-sectional area of ​​the flow stabilizing recess 11 perpendicular to the axis of the inner flame cap body 1 gradually decreases along the direction from the flame outlet end to the air inlet end.

[0035] Based on the aforementioned embodiments, in this embodiment, the flow stabilizing recess 11 has a tapering structure from top to bottom. This tapering structure forms a Venturi effect, which accelerates and stabilizes the airflow as it passes through, which is beneficial for further mixing of gas and air and improves uniformity. The accelerated airflow can prevent gas stagnation and reduce the risk of backfire. like Figure 2 and 4 As shown, in one optional embodiment, the cross-section of the flow stabilizing recess 11 is circular; the axial cross-section of the flow stabilizing recess 11 is trapezoidal.

[0036] Based on the aforementioned embodiments, in this embodiment, a circular cross-section facilitates a uniform circumferential distribution of airflow; a trapezoidal cross-section ensures smooth and accelerated airflow. Both circular and trapezoidal cross-sections reduce processing difficulty and improve processing efficiency.

[0037] like Figure 2 As shown, in one optional implementation, a plurality of flow holes 12 are formed at the bottom of the flow stabilizing recess 11, and the bottom of the flow stabilizing recess 11 is flat.

[0038] Based on the aforementioned embodiments, in this embodiment, the bottom of the flow-stabilizing recess 11 is flat, which facilitates the processing and distribution of the flow holes 12. The flow holes 12 are opened along the thickness direction of the flat plate, ensuring consistent airflow direction and more controllable mixing. In addition, the gas is injected vertically upwards, which is beneficial for natural diffusion within the flow-stabilizing cavity 3. Multiple flow holes 12 can be arranged in a ring array or a regular polygon, simplifying the processing technology.

[0039] like Figure 1-4As shown, as an optional implementation, the flame outlet end of the inner flame cover body 1 is also provided with an annular liquid accumulation groove 13 that is recessed towards the air inlet end. The liquid accumulation groove 13 is arranged around the outer periphery of the mesh 2, and the outer wall of the liquid accumulation groove 13 is provided with a liquid discharge outlet.

[0040] Based on the aforementioned embodiments, in this embodiment, the flame outlet end of the inner flame cap body 1 is further provided with an annular liquid collection groove 13. The bottom of the liquid collection groove 13 is lower than the upper surface of the mesh 2, and it is used to collect the soup that overflows during cooking or the liquid that enters during cleaning. The outer wall of the liquid collection groove 13 is provided with at least one liquid discharge outlet, from which the liquid can be discharged to avoid entering the flame hole or the flow stabilizing cavity 3. The liquid discharge outlet has a guide plane that slopes downward toward the air inlet end to guide the liquid to be discharged outward.

[0041] In some embodiments, the liquid discharge outlet is a hole structure that slopes downward toward the air inlet.

[0042] like Figure 2-4 As shown, as an optional embodiment, the inner fire cover body 1 also has a stepped portion 14 formed along the outer side of the opening edge of the flow stabilizing recess 11, which is supported on the mesh 2.

[0043] Based on the aforementioned embodiments, in this embodiment, the inner flame cover body 1 forms an annular step portion 14 on the outer side of the opening edge of the flow stabilizing recess 11. The upper surface of the step portion 14 is attached to the lower surface of the mesh 2, providing support and positioning for the mesh 2. The height of the step portion 14 is higher than the thickness of the mesh 2, ensuring that the mesh 2 does not shift or deform under high temperature and airflow impact.

[0044] As an optional implementation, mesh 2 is a metal mesh.

[0045] Based on the aforementioned embodiments, in this embodiment, the mesh 2 is made of metal materials such as stainless steel and nickel-based alloys. The metal mesh has fast heat conduction, uniform temperature, and reduced thermal stress. It also possesses characteristics such as high temperature resistance, resistance to deformation, long service life, and corrosion resistance. The metal mesh can be laser-processed with micro-holes, resulting in good pore size consistency. The relatively thin mesh 2 has low air outlet resistance, thus improving the burner's ejector performance and increasing the primary air coefficient of the furnace head.

[0046] In some embodiments, the surface of mesh 2 is covered with a ceramic coating to enhance its antioxidant properties.

[0047] In some embodiments, the mesh 2 is a ceramic porous plate.

[0048] In some embodiments, the mesh 2 is micro-arched to enhance structural rigidity.

[0049] Based on the same inventive concept, embodiments of this application provide a burner including the inner flame cap of any of the foregoing embodiments.

[0050] Based on the aforementioned embodiments, in this embodiment, the burner further includes a furnace base and an outer flame cap. The furnace base includes an inner ring gas passage and an outer ring gas passage. The gas outlet of the outer ring gas passage surrounds the outside of the gas outlet of the inner ring gas passage; the inner flame cap covers the inner ring gas passage, and the outer flame cap covers the outer ring gas passage, surrounding the outside of the outer flame cap.

[0051] In the description of this application, it should be understood that the terms "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0052] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0053] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0054] The above description is only a partial embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. An inner flame cap for a burner, characterized in that, include: The inner flame cap body (1) is columnar and has an air inlet end and a flame outlet end; the flame outlet end has a flow stabilizing recess (11) recessed towards the air inlet end, and a plurality of flow holes (12) connected to the air inlet end and the flame outlet end are opened in the flow stabilizing recess (11). The mesh (2) has multiple fire outlet holes (21). The mesh (2) covers the opening of the flow stabilizing recess (11) and forms a flow stabilizing cavity (3) with the flow stabilizing recess (11).

2. The inner flame cap for a burner according to claim 1, characterized in that, The diameter of the flow orifice (12) is larger than the diameter of the flame outlet orifice (21).

3. The inner flame cap for a burner according to claim 1, characterized in that, The spacing between the plurality of flow holes (12) is greater than the spacing between the plurality of fire outlet holes (21).

4. The inner flame cap for a burner according to claim 1, characterized in that, The cross-sectional area of ​​the flow-stabilizing recess (11) perpendicular to the axis of the inner flame cap body (1) gradually decreases along the direction from the flame outlet end to the air inlet end.

5. The inner flame cap for a burner according to claim 4, characterized in that, The cross-section of the flow-stabilizing recess (11) is circular; The axial cross section of the flow-stabilizing recess (11) is trapezoidal.

6. The inner flame cap for a burner according to claim 1, characterized in that, The plurality of flow holes (12) are opened at the bottom of the flow stabilizing recess (11), and the bottom of the flow stabilizing recess (11) is flat.

7. The inner flame cap for a burner according to claim 1, characterized in that, The flame outlet end of the inner flame cover body (1) is also provided with an annular liquid accumulation groove (13) that is recessed towards the air inlet end. The liquid accumulation groove (13) is arranged around the outer periphery of the mesh (2), and the outer wall of the liquid accumulation groove (13) is provided with a liquid discharge outlet.

8. The inner flame cap for a burner according to claim 1, characterized in that, The inner fire cover body (1) also has a stepped portion (14) formed on the outer side of the opening edge of the flow stabilizing recess (11), the stepped portion (14) being supported by the mesh (2).

9. The inner flame cap for a burner according to claim 1, characterized in that, The mesh (2) is a metal mesh (2).

10. A burner, characterized in that, Includes the inner flame cap as described in any one of claims 1-9.

Images