Fire grate for a burner, burner and water heater

Abstract

The utility model provides a kind of fire for burner, burner and water heater, fire for burner includes integrally-formed shell, airflow passage and the long strip combustion chamber that is communicated with airflow passage are arranged in shell, the flame hole arrangement of fire is arranged on the top wall of combustion chamber;The top wall of combustion chamber is upwardly convex in middle part, and its two sides are curved or inclined extension from middle part downwardly.This utility model sets up as the structure that top wall located in integrally-formed shell top is upwardly convex in middle part, two sides are curved or inclined from middle part downwardly, can make the flame form on it more stable, it is favorable to cancel the flame stabilizing structure of existing fire, simultaneously, the above-mentioned setting can expand flame coverage, improve the mixing effect of gas and air, so as to improve the combustion efficiency of gas, improve the heating effect to heating surface.

Description

Technical Field

[0001] This utility model belongs to the field of burner technology, specifically relating to a burner vent, burner, and water heater. Background Technology

[0002] In traditional burner designs, the burner typically consists of a shell, an airflow channel, and a combustion chamber. The function of the airflow channel is to guide the combustion gas into the combustion chamber, where it mixes with air and burns, releasing heat.

[0003] However, in existing technologies, the top wall of a one-piece burner is typically designed as a flat surface, meaning the flame surface on the burner used to arrange the flame holes is flat. A flame stabilizing structure is also added to the one-piece burner to ensure stable combustion. For example, Chinese invention patent application CN202210887623.X discloses a burner, burner, and water heater. In this design, a separate flame cap is required, which is placed over the burner body, forming an auxiliary channel between the cap and the burner body.

[0004] The addition of a flame stabilizing structure increases the structural complexity and assembly difficulty of the burner's flame deck.

[0005] In view of this, this utility model is proposed. Utility Model Content

[0006] This utility model provides a burner grating for a burner. By setting the top wall of the one-piece molded shell to be convex upward in the middle and curved or inclined downward from the middle on both sides, it solves the problem of the complexity of the existing burner structure and the high assembly difficulty caused by the need to add a flame stabilizing structure due to the unstable flame shape.

[0007] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by this utility model is: a burner for a burner, including an integrally formed shell, an airflow channel and a long strip-shaped combustion chamber connected to the airflow channel, and flame exhaust holes of the burner arranged on the top wall of the combustion chamber; the top wall of the combustion chamber protrudes upward in the middle, and its two sides bend downward or extend obliquely from the middle.

[0008] Furthermore, the exhaust holes are arranged from the middle of the top wall to both sides until they are close to the lower edges of the two sides of the top wall.

[0009] Furthermore, the top wall includes multiple sections with exhaust holes, the multiple sections are arranged at intervals along the length of the combustion chamber, and the exhaust holes are evenly arranged in each section; or, the exhaust holes include a first exhaust hole, which is arranged or extended obliquely from both sides of the bisector of the top wall to the lower edge of both sides of the top wall; and a second exhaust hole, which is arranged at intervals along the bisector of the top wall.

[0010] Furthermore, the first row of flame holes is provided with multiple sets arranged at intervals along the bisector of the top wall. The arrangement path of each set of first row of flame holes is symmetrical with respect to the bisector of the top wall, and the arrangement path of the first row of flame holes and the projection of the bisector of the top wall onto the horizontal plane form an acute angle.

[0011] Furthermore, the first exhaust port includes a strip-shaped hole extending along the arrangement path, and / or, the first exhaust port includes circular holes arranged along the arrangement path.

[0012] Furthermore, multiple sets of first flame exhaust holes are evenly arranged along the bisector of the top wall; or, at least two sets of first flame exhaust holes arranged at intervals along the bisector of the top wall constitute a unit, the arrangement interval of the first flame exhaust holes in two adjacent units is the first interval, the arrangement interval between two adjacent first flame exhaust holes in a unit is the second interval, and the first interval is greater than the second interval.

[0013] Furthermore, the interval between two adjacent second flame exhaust holes is less than or equal to the interval between two adjacent first flame exhaust holes; in the horizontal direction perpendicular to the bisector of the top wall, the second flame exhaust holes are arranged correspondingly to or intersecting with the first flame exhaust holes.

[0014] Furthermore, the top wall is symmetrical with respect to the vertical plane containing its bisector; the top wall is an arc surface that curves downward on both sides, with the central angle corresponding to the arc surface being less than or equal to 180°, and the central angle corresponding to the area on the top wall with the exhaust hole is in the range of 90° to 130°; or, the top wall has a pointed structure with a pointed protrusion in the middle and downward sloping extensions on both sides; or, the top wall extends horizontally in the middle and downward sloping extensions on both sides.

[0015] This utility model also provides a burner, which is equipped with the above-mentioned burner vent.

[0016] This utility model also provides a water heater equipped with the aforementioned burner.

[0017] By adopting the above technical solution, this utility model has the following beneficial effects compared with the prior art.

[0018] 1. By setting the top wall of the one-piece molded shell to be convex upward in the middle and curved or inclined downward from the middle on both sides, the flame pattern on it can be made more stable, which is conducive to eliminating the existing flame stabilization structure of the fire rack. At the same time, the above setting can expand the flame coverage area and improve the mixing effect of gas and air, thereby improving the combustion efficiency of gas and improving the heating effect on the heating surface.

[0019] 2. By setting the arrangement path of the first flame exhaust hole symmetrical with respect to the bisector of the top wall, this utility model increases the coverage area of ​​the flame exhaust hole on the combustion chamber, thereby expanding the heat coverage area. At the same time, the inclined and symmetrical arrangement of the flame exhaust hole can also make the flame converge, concentrate the heat, and improve the heating effect.

[0020] 3. This invention features a combustion chamber with a circular arc-shaped top wall, where the cross-section transitions into an arc and curves downwards. This allows the combustion airflow to flow smoothly along the arc, reducing turbulence and flow losses, and improving flame uniformity. Simultaneously, the arc-shaped top wall creates a flame surface structure within the combustion chamber that is higher in the center and lower on both sides, effectively increasing the flame surface area. This expands the combustion zone, improves combustion completeness, reduces flame deviation, and enhances flame self-stability, eliminating the need for a flame stabilization structure.

[0021] 4. This utility model sets the second flame exhaust holes on the top wall of the combustion chamber, which are mainly distributed in the central area of ​​the combustion chamber, i.e. the top of the top wall of the combustion chamber, to form the core flame of combustion; the first flame exhaust holes are distributed on both sides, i.e. the two sides of the top wall, to expand the flame coverage range and ensure more complete combustion.

[0022] 5. This utility model sets up a circular first flame exhaust hole and a strip-shaped second flame exhaust hole. The strip-shaped first flame exhaust hole extends downward from the top of the top wall to the side of the top wall. The direction of inclination is at an acute angle to the arrangement direction of the second flame exhaust hole, forming a three-dimensional cross-combustion structure, which improves the space utilization of combustion and eliminates the need for a flame stabilization structure.

[0023] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings. Attached Figure Description

[0024] The accompanying drawings, as part of this utility model, are used to provide a further understanding of the present utility model. The illustrative embodiments and descriptions of the present utility model are used to explain the present utility model, but do not constitute an undue limitation of the present utility model. Obviously, the drawings described below are merely some embodiments; those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings:

[0025] Figure 1 This is a schematic diagram of the structure of the fire bar in an embodiment of this utility model;

[0026] Figure 2 This is a cross-sectional schematic diagram of the fire bar in an embodiment of this utility model;

[0027] Figure 3 This is a cross-sectional schematic diagram from another perspective in an embodiment of this utility model;

[0028] Figure 4This is a schematic diagram of the arrangement of the exhaust holes at the top of the combustion chamber in an embodiment of this utility model;

[0029] Figure 5 This is a schematic diagram of the structure of the fire bar in another embodiment of the present invention;

[0030] Figure 6 This is a schematic diagram of the flame exhaust hole structure in another embodiment of the present invention;

[0031] Figure 7 This is a schematic diagram of the flame exhaust hole structure in another embodiment of the present invention;

[0032] Figure 8 This is a schematic diagram of the flame exhaust hole structure in another embodiment of the present invention;

[0033] Figure 9 This is a cross-sectional schematic diagram of the top wall of the combustion chamber in an embodiment of this utility model;

[0034] Figure 10 This is a cross-sectional schematic diagram of the top wall of the combustion chamber in another embodiment of the present invention;

[0035] Figure 11 This is a cross-sectional schematic diagram of the top wall of the combustion chamber in another embodiment of the present invention.

[0036] Description of main components in the diagram:

[0037] 1. Shell; 10. Channel; 11. Input section; 110. Inlet of input section; 111. Contraction section; 112. Horizontal section; 113. Expansion section; 1131. Outlet of input section; 12. Output section; 121. Inlet of output section; 122. Outlet of output section; 13. Bend; 130. Guide surface; 1301. First guide surface; 1302. Second guide surface; 14. Connecting port; 141. Diverting port; 142. Connecting point; 20. Combustion chamber; 201. Top wall; 2011. First exhaust port; 2012. Second exhaust port.

[0038] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0040] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0041] In the description of this utility model, it should be noted that, unless otherwise explicitly 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0042] like Figures 1 to 11 As shown in the embodiment of this utility model, a burner vent is introduced.

[0043] In this embodiment, the burner is a grate burner, including a housing 1, an airflow channel 10 and a combustion chamber 20 communicating with the airflow channel 10 are formed inside the housing 1.

[0044] Specifically, in this embodiment, the combustion chamber 20 is located at the top of the housing 1, and the airflow channel 10 communicates with the combustion chamber 20 from the bottom of the combustion chamber 20 to guide the combustion gas into the combustion chamber 20.

[0045] In this embodiment, the shell 1 is a one-piece molded structure. In some specific embodiments, the shell 1 is made of a metal plate with grooves formed by pressing, and then the metal plate is folded and welded to form a shell with a combustion chamber and airflow channel.

[0046] In some possible embodiments, the metal plate is a rectangular metal plate with a grooved molding in the middle. The grooved molding has a symmetrical structure. The metal plate is folded along the symmetry line of the grooved molding, so that the grooved moldings on the left and right sides of the symmetry line are fastened together, forming the shell with a combustion chamber and an airflow channel. The symmetry line is the bisector of the top wall of the combustion chamber.

[0047] In this embodiment, the top wall 201 of the combustion chamber 20 protrudes upward in the middle, and its two sides bend downward or extend obliquely from the middle; the flame exhaust holes of the burner are arranged on the top wall 201 of the combustion chamber 20.

[0048] In this embodiment, as Figure 9 As shown, the top wall 201 is an arc surface that curves downwards on both sides; or, as... Figure 10As shown, the top wall has a pointed structure with a pointed protrusion in the middle and downward sloping sides; or, as... Figure 11 As shown, the top wall extends horizontally in the middle and slopes downward on both sides.

[0049] Preferably, the exhaust holes are arranged from the middle of the top wall 201 to both sides until they are close to the lower edges of both sides of the top wall 201.

[0050] like Figure 1 As shown, in some possible embodiments, the top wall 201 includes multiple sections with exhaust holes, the multiple sections are arranged at intervals along the length of the combustion chamber 20, and the exhaust holes are evenly arranged in each section.

[0051] like Figures 4 to 8 As shown, the flame exhaust holes include a first flame exhaust hole 2011 and a second flame exhaust hole 2012. The first flame exhaust hole 2011 is arranged or extends obliquely from both sides of the bisector of the top wall 201 to the lower edge of both sides of the top wall 201. The second flame exhaust hole 2012 is arranged at intervals along the bisector of the top wall 201.

[0052] Specifically, in this embodiment, the top wall 201 of the combustion chamber 20 is provided with a first flame exhaust hole 2011, which is obliquely arranged or extended on the top wall 201. This expands the flame coverage area, improves the mixing effect of fuel gas and air, and makes the flame shape more stable, thereby improving the combustion efficiency of the fuel gas and enhancing the heating effect on the heating surface.

[0053] In some specific embodiments, the first exhaust port 2011 includes multiple sets arranged at intervals along the bisector of the top wall to ensure that the airflow can be evenly distributed into the combustion chamber 20; the arrangement path of each set of first exhaust ports 2011 is symmetrically arranged with respect to the bisector of the top wall 201 of the combustion chamber 20, and the angle between the first exhaust port 201 and the bisector of the top wall is an acute angle projected onto the horizontal plane.

[0054] In some preferred embodiments, the bisector of the top wall extends along the length of the combustion chamber, and the top wall 201 is symmetrical about its bisector.

[0055] Specifically, in this embodiment, the arrangement path of the first flame exhaust hole 2011 in each group is symmetrically arranged with respect to the bisector of the top wall 201 of the combustion chamber 20; the angle between the arrangement path of the first flame exhaust hole 2011 on one side of the bisector of the top wall and the arrangement path of the first flame exhaust hole 2011 on the other side of the bisector of the top wall in each group can be an acute angle or an obtuse angle.

[0056] Preferably, in this embodiment, the angle between the arrangement path of the first flame exhaust hole 2011 on one side of the bisector of the top wall and the arrangement path of the first flame exhaust hole 2011 on the other side of the bisector of the top wall in each group is an obtuse angle.

[0057] The above design increases the coverage area of ​​the first flame hole 2011 on the horizontal plane, thereby increasing the contact area between the airflow and the air in the combustion chamber 20, promoting full mixing of gas and oxygen, improving combustion efficiency and reducing harmful gas emissions.

[0058] In this embodiment, the first exhaust hole 2011 includes a strip-shaped hole extending along the arrangement path, and / or a circular hole arranged along the arrangement path.

[0059] In one specific embodiment, the first exhaust port 2011 can be a strip-shaped port, specifically, it can be a plurality of strip-shaped ports arranged at intervals along the bisector of the top wall, or it can be a single strip-shaped port extending along the arrangement path; the strip-shaped port extends along the arrangement path, and the length and width of the port can be adjusted according to specific combustion requirements to optimize the airflow distribution effect.

[0060] Preferably, in the above specific embodiments, each group of first exhaust holes 2011 is configured as two symmetrically arranged along the bisector of the top wall, and the two first exhaust holes 2011 are strip-shaped, and the angle between each strip-shaped first exhaust hole 2011 and the bisector of the top wall is an acute angle projected onto the horizontal plane.

[0061] In another specific embodiment, the first exhaust port 2011 is a circular port, and there are several of them. That is, each group of first exhaust ports 2011 includes several circular ports distributed on both sides of the bisector of the top wall. There are multiple circular first exhaust ports 2011 located on either side of the bisector of the top wall, and they are arranged at intervals along an acute-angled path along the projection of the angle with the bisector of the top wall onto the horizontal plane. The intervals between the multiple first exhaust ports 2011 in each group are the same. The first exhaust port 2011 is set as a circular port, which has a more uniform airflow injection effect and is suitable for situations where more uniform gas diffusion is required.

[0062] Furthermore, in each group, the interval between the two circular holes that are the smallest and symmetrically arranged along the bisector of the top wall is greater than the interval between the multiple circular holes that are inclinedly arranged on both sides of the bisector of the top wall.

[0063] Of course, the circular first flame exhaust hole 2011 in the other specific embodiment described above can also be set as square, etc., as long as multiple first flame exhaust holes 2011 are provided on either side of the bisector of the top wall.

[0064] In another specific embodiment, the first flame exhaust hole 2011 includes a circular first flame exhaust hole 2011 and a strip-shaped first flame exhaust hole 2011. Multiple first flame exhaust holes 2011 are provided on either side of the bisector of the top wall, and the circular and strip-shaped first flame exhaust holes 2011 are alternately arranged along the arrangement path.

[0065] Whether the orifices are strip-shaped or circular, their arrangement paths are symmetrically set relative to the bisector of the top wall 201 of the combustion chamber 20, ensuring that the airflow can flow into the combustion chamber 20 evenly. At the same time, the arrangement paths of the exhaust orifices form an acute angle with the horizontal projection of the bisector of the top wall 201, thereby further enhancing the contact between the airflow and the air, improving combustion efficiency and reducing harmful emissions.

[0066] like Figure 7 and Figure 8 As shown, in some possible embodiments, the plurality of first exhaust holes 2011 are evenly arranged along the bisector of the top wall 201.

[0067] like Figure 6 As shown, in some other possible embodiments, at least two sets of first exhaust holes 2011 arranged at intervals along the bisector of the top wall 201 constitute a unit. The first exhaust holes 2011 within each unit are arranged at a certain interval, and the arrangement interval between the first exhaust holes 2011 of two adjacent units is a first interval. The arrangement interval between the first exhaust holes 2011 within each unit is a second interval, and the first interval is greater than the second interval.

[0068] Specifically, the second interval is the interval between two adjacent first flame exhaust holes 2011 in at least two sets of first flame exhaust holes 2011 arranged at intervals along the bisector of the top wall 201 within each unit.

[0069] In this embodiment, a second exhaust port 2012 is also provided on the top wall 201 of the combustion chamber 20. The second exhaust port 2012 is located on the bisector of the top wall 201 and is arranged at intervals along the bisector of the top wall 201. Through this design, the second exhaust port 2012 can further optimize the airflow distribution in the combustion chamber 20, ensuring uniform diffusion of airflow within the combustion chamber 20. Since the second exhaust port 2012 is arranged along the bisector of the top wall 201 and is coordinated with the arrangement of the first exhaust port 2011 in the combustion chamber 20, they can effectively guide the airflow, making combustion more complete and stable.

[0070] Preferably, in this embodiment, the axis of the second flame hole 2012 is perpendicular to the bisector of the top wall 201, which further promotes the uniform distribution of airflow in the combustion chamber 20 and helps to improve the stability of the flame.

[0071] More preferably, in this embodiment, the second flame outlet 2012 is a circular hole, which can provide a uniform airflow injection effect and avoid uneven airflow or local overheating. The flow characteristics of the circular hole allow the airflow to enter the combustion chamber 20 smoothly and stably, further improving the combustion efficiency and ensuring the uniform distribution of the flame.

[0072] Of course, the second row of flame holes 2012 can also be set as square holes, and the specific structure of the second row of flame holes 2012 can be adjusted.

[0073] Specifically, in this embodiment, the interval between two adjacent second exhaust holes 2012 arranged along the bisector of the top wall 201 is less than or equal to the first interval, which helps to arrange the exhaust holes more compactly, increase the airflow distribution density, and enable the airflow to be distributed more evenly into the combustion chamber 20, thereby further improving the combustion efficiency.

[0074] In this embodiment, the second flame exhaust hole 2012 is arranged in a horizontal direction along the bisector of the top wall 201, corresponding to or intersecting with the first flame exhaust hole 2011.

[0075] When the second flame exhaust hole 2012 is set in correspondence with the first flame exhaust hole 2011, the ends of the first flame exhaust holes 2011 located on both sides of the bisector of the top wall 201 in each group that are closest to each other are set in correspondence with the second flame exhaust holes 2012 set on the bisector of the top wall 201 in that group. This helps to ensure uniform flow of air in the combustion chamber 20, ensures flame stability, avoids airflow concentration or excessive dispersion, and improves combustion efficiency.

[0076] When the second flame hole 2012 is staggered with the first flame hole 2011, the airflow can cover each area in the combustion chamber 20 more evenly, avoiding excessive airflow concentration, thereby improving the overall combustion and efficiency, and reducing unstable phenomena such as backfire and flame lift-off.

[0077] In this embodiment, the top wall 201 of the combustion chamber 20 protrudes upward in the middle, and its two sides bend downward or extend obliquely from the middle to connect with the side wall of the combustion chamber 20. This effectively guides the airflow into the combustion chamber 20 and ensures uniform airflow distribution during combustion. The protruding design in the middle of the top wall 201 helps improve the stability of the airflow in the combustion chamber 20 and promotes thorough mixing of gas and air, thereby improving combustion efficiency.

[0078] Preferably, the first flame orifice 2011 extends downwards at an angle from the middle of the top wall 201 of the combustion chamber 20 to the side of the top wall 201. The angle of inclination of the first flame orifice 2011 allows the airflow to smoothly enter the combustion chamber 20 along the inclined path, effectively improving combustion efficiency and avoiding uneven airflow distribution. The first flame orifice 2011 forms an acute angle with at least part of the vertical plane containing the bisector of the top wall 201, which helps to expand the airflow and makes the airflow more fully mixed with the air in the combustion chamber 20, thus improving the stability of the combustion process.

[0079] In this embodiment, the top wall 201 is symmetrical with respect to the vertical plane containing its bisector;

[0080] In one specific embodiment, the top wall 201 of the combustion chamber 20 is arc-shaped, meaning that the vertical cross-section of the top wall 201 is arc-shaped, with both ends curving downwards. This allows the combustion airflow to flow smoothly along the arc surface, reducing turbulence and flow losses, and improving flame uniformity. Simultaneously, the curved surface design of the arc-shaped top wall 201 provides a larger flame spread area during flame distribution, making the flame more stable and reducing localized overheating and incomplete combustion.

[0081] Preferably, in this embodiment, the central angle corresponding to the arc surface is less than or equal to 180°, and the central angle corresponding to the area on the top wall 201 where the flame exhaust hole is provided is in the range of 90° to 130°.

[0082] Specifically, the central angle corresponding to the arc surface is greater than 90° and less than or equal to 180°. The area with the exhaust holes is located in the middle of the arc surface along its circumference.

[0083] Preferably, the central angle corresponding to the arc surface is 180°. In the circumferential direction of the arc surface, the angle between the two ends of the area with the flame exhaust hole and the center of the arc surface is greater than or equal to 90° and less than or equal to 130°. The area with the flame exhaust hole on the top wall 201 is symmetrical about the bisector of the top wall 201. This ensures that the flame has a large coverage area and avoids the flame from being too dispersed, which is conducive to improving the coordination between adjacent flame rows and enhancing the heating effect.

[0084] like Figure 10 As shown, in another specific embodiment, the protruding portion of the top wall 201 of the combustion chamber 20 can have a pointed structure, that is, the top wall 201 forms a triangular structure with an acute-angled protrusion at the top, and the two sides slope downward and connect to the side walls of the combustion chamber 20. This allows the flame to be evenly distributed along both sides within the combustion chamber 20, forming a reasonable flame coverage area in the high-temperature zone, while enhancing the self-stability of the flame and helping to reduce flame drift during combustion. Furthermore, the triangular structure can be an isosceles triangle.

[0085] In another specific implementation, such as Figure 11 As shown, the protruding end face of the top wall 201 of the combustion chamber 20 extends horizontally, forming a trapezoidal structure. The top region is a relatively flat horizontal surface, while the sides slope downwards to the side walls of the combustion chamber 20. This trapezoidal top wall 201 structure optimizes the airflow within the combustion chamber 20, allowing for a more uniform airflow distribution after the combustion gas enters the chamber, reducing airflow concentration or turbulence, and improving combustion stability. Compared to a triangular cross-section, the trapezoidal top wall 201 provides a larger airflow buffer at the top, reducing flow resistance and further optimizing combustion efficiency.

[0086] In this embodiment, the second flame exhaust holes 2012 are mainly distributed in the central region of the combustion chamber 20, which is the top of the top wall 201 of the combustion chamber 20, and are used to form the core flame of combustion. The first flame exhaust holes 2011 are distributed in the lateral regions, which are the sides of the top wall 201, and are used to expand the flame coverage range to ensure more complete combustion. At least some of the axes of the first flame exhaust holes 2011 form an acute angle with the horizontal plane, that is, the flame spray direction of the second flame exhaust holes 2012 is relatively inclined, which can form cross combustion, improve combustion efficiency, and reduce flame retraction or drift.

[0087] In this embodiment, when the first row of flame holes 2011 is a strip-shaped flame hole, it can form a wider flame injection area, which helps to improve the flame interaction effect between adjacent flame rows, enhance the mixing efficiency of gas and air, and thus make combustion more complete. Furthermore, the specific shape of the strip-shaped hole cross-section can be set according to the actual situation.

[0088] In this embodiment, the top wall of the combustion chamber is preferably arc-shaped, that is, multiple arc-shaped flame rows are arranged in combination, and multiple circular first flame holes 2011 or strip-shaped first flame holes 2011 are inclinedly arranged on both sides of the top wall 201. This can form a three-dimensional cross flame structure in the combustion chamber 20, producing a fan-shaped scattering flame. In this way, a self-stabilizing combustion flame can be formed without relying on a flame stabilizing structure, making the flame more stable and reliable. Since there is no obstruction from the flame stabilizing structure, the air can come into more full contact with the flame, enhancing the mixing effect of the flame and secondary air, and realizing a three-dimensional combustion effect. This not only reduces the number of components and the manufacturing cost of the burner, but also improves the overall reliability and energy efficiency of the combustion system.

[0089] In this embodiment, the burner includes a combination of multiple parallel and spaced arc-shaped burners to optimize combustion uniformity and improve thermal efficiency.

[0090] like Figures 1 to 2 As shown, in this embodiment, the output section 12 of the channel 10 bends upward and extends, forming a bend 13 between the input section 11 and the output section 12. An upwardly inclined guide surface 130 is provided at the bend of the bend 13. The guide surface 130 is opposite to the extension direction of the input section 11 and is used to guide the adjustment of the airflow direction so that the gas mixture can flow along an optimized path, thereby improving the combustion efficiency.

[0091] Specifically, in this embodiment, the input section 11 includes a contraction section 111, a horizontal section 112, and an expansion section 113. The contraction section 111 is located at the inlet 110 of the input section and its main function is to accelerate the gas flow entering the channel 10, increase the kinetic energy of the gas, and enhance the jet effect of the subsequent airflow. The horizontal section 112 is connected downstream of the contraction section 111, which homogenizes the high-speed gas flow in a short period of stability, helps to improve the mixing state of gas and air, and avoids flow turbulence caused by sudden changes in flow velocity. The expansion section 113 is located downstream of the input section 11 and is connected to the bend 13. Its function is to appropriately reduce the airflow velocity, alleviate the flow impact, and make the airflow more stable before entering the bend 13, so as to ensure that the guide surface 130 can more effectively guide the airflow to change direction and improve the gas delivery efficiency.

[0092] In the specific working process, the gas is ejected through the nozzle and enters the channel 10 from the inlet 110 of the input section under the action of negative pressure and gas jet, and flows along the input section 11 to the bend between the input section 11 and the output section 12. When the airflow reaches the bend, it is affected by the guide surface 130, which adjusts the airflow direction. Then it enters the output section 12 and further flows into the combustion chamber 20, and flows out of the combustion chamber 20 for combustion.

[0093] In this embodiment, the flow guiding surface 130 is formed by a portion of the inner wall of the channel 10, and / or, a flow guiding plate is separately provided inside the channel 10, and the side of the flow guiding plate is used as the flow guiding surface 130.

[0094] Specifically, in this embodiment, the guide surface 130 includes a first guide surface 1301. The angle between the first guide surface 1301 and the axis of the input section 11 is an obtuse angle, which causes the airflow to gradually deflect along the tilt angle of the first guide surface 1301, avoiding flow separation, reducing the generation of turbulence, thereby reducing kinetic energy loss and improving air ejection efficiency.

[0095] Preferably, in this embodiment, the axis of the input segment 11 extends in the horizontal direction to further ensure the stability of the gas flow in the channel 10.

[0096] In this embodiment, the projections of the axis of the input section 11 and the axis of the output section 12 onto the vertical plane form an acute angle. The first guide surface 1301 extends upward at an angle from the lower end of the outlet 1131 of the input section to optimize the airflow direction and reduce kinetic energy loss. Simultaneously, to further adjust the airflow distribution, a second guide surface 1302 is provided at the upper end of the first guide surface 1301. The second guide surface 1302 bends towards the side near the inlet 110 of the input section, causing the airflow to undergo a reasonable flow direction adjustment under the action of the first guide surface 1301 and the second guide surface 1302. On one hand, refraction causes the high-speed flowing mixed gas to gradually deflect on the first guide surface 1301 and the second guide surface 1302, thus smoothly transitioning into the output section 12. On the other hand, scattering causes some of the airflow to undergo minor directional distribution adjustments on the first guide surface 1301 and the second guide surface 1302, allowing the airflow to enter the combustion chamber 20 more evenly and improving the mixing uniformity of the fuel gas and air.

[0097] In this embodiment, compared with the traditional U-shaped arc structure, both the first guide surface 1301 and the second guide surface 1302 are planar structures, rather than simply relying on curved surfaces to guide the airflow. This allows for more precise adjustment of the airflow when passing through the bend 13. Although the traditional U-shaped arc structure can guide the airflow, its continuous curved surface easily leads to enhanced local turbulence and uneven velocity distribution, thereby increasing energy loss. This embodiment optimizes the airflow path through the folded structure formed by the first guide surface 1301 and the second guide surface 1302, allowing the airflow to transition smoothly at the bend 13, reducing turbulence, improving airflow stability, and ensuring a more uniform flow state of the combustion gas before entering the combustion chamber 20, thereby improving combustion efficiency and flame stability.

[0098] In other embodiments, the flow guiding surface 130 includes a first flow guiding surface 1301, a second flow guiding surface 1302, and a third flow guiding surface; of course, the specific number of flow guiding surfaces 130 is not limited and can be adjusted according to actual usage requirements. For example, the flow guiding surface 130 can be set as one or more, and can be selected to be connected sequentially or spaced apart to adapt to different combustion requirements.

[0099] Specifically, in this embodiment, the projections of the axis of the input segment 11 and the axis of the output segment 12 on the horizontal plane coincide, thereby shortening the total length of the channel 10 to a certain extent, so as to improve the gas flow efficiency and thus improve the combustion efficiency.

[0100] In another specific embodiment, the projections of the axis of the input segment 11 and the axis of the output segment 12 onto the horizontal plane form an acute angle to accommodate different gas flow characteristics.

[0101] Preferably, in this embodiment, the angle between the second guide surface 1302 and the axis of the input section 11 is acute, so as to more accurately control the airflow direction and reduce turbulence generation.

[0102] In this embodiment, the angle between the second guide surface 1302 and the first guide surface 1301 is an obtuse angle, which allows the airflow to adjust its direction more smoothly when passing through the guide surface 130, further reducing turbulence and improving combustion stability and energy efficiency.

[0103] In the above embodiments, after the gas mixture of fuel gas and air enters the channel 10, due to the high flow velocity, the curved inner wall of the channel 10 causes severe energy dissipation during airflow, resulting in flow separation and turbulence, leading to kinetic energy loss, high airflow resistance, and affecting the mixing effect of fuel gas and air. Therefore, by providing an upwardly inclined guide surface 130, the curved inner wall of the channel 10 forms a bend 13, allowing the airflow to smoothly change direction sequentially along the directions of the first guide surface 1301 and the second guide surface 1302 as it passes through the channel 10, thereby reducing turbulence and minimizing the ineffective dissipation of kinetic energy.

[0104] like Figures 1 to 3 As shown, in this embodiment, the outlet 122 of the output section is connected to the middle of the combustion chamber 20 of the housing 1, and the pipe wall of the output section 12 connected to the upper end of the second guide surface 1302 is provided with a diversion port 141 that is connected to the combustion chamber 20, so as to make the airflow flow to the combustion chamber 20 more evenly.

[0105] Specifically, in this embodiment, the diversion port 141 is connected to the outlet 122 of the output section along the length of the combustion chamber 20, and the width of the connection 142 between the diversion port 141 and the outlet 122 of the output section gradually increases from the diversion port 141 to the outlet 122 of the output section, which facilitates the transition of airflow and reduces airflow separation and local airflow turbulence.

[0106] More specifically, in this embodiment, the width of the diversion port 141 is smaller than the width of the outlet 122 of the output section. Since the diversion port 141 is located above the bend 13, the diversion port 141 can restrict the airflow and prevent most of the airflow passing through the bend 13 from directly entering the combustion chamber 20 through the diversion port 141, thus avoiding unilateral flow deviation and affecting the uniform distribution of airflow, and improving the uniformity of airflow distribution in the combustion chamber.

[0107] Furthermore, the configuration of the diversion port 141 divides the upper pipe wall of the output section 12 into two opposing parts on the housing 1, namely the opposing first wall and the second wall. The distance between the first wall and the second wall is equal. At the same time, the side of the first wall and the second wall connected to the second guide surface 1302 bends outward to avoid insufficient airflow distribution at the edge of the combustion chamber 20 and improve combustion stability.

[0108] Preferably, in this embodiment, the projection of the diversion port 141 on the horizontal plane covers the inlet 121 of the output section.

[0109] In the above embodiment, the diversion port 141, the outlet 122 of the output section, and the connection 142 between the two together form the connection port 14 connecting the channel 10 and the combustion chamber 20.

[0110] As the airflow direction is adjusted when it passes through the bend 13 of the channel 10, part of the airflow enters the output section 12 along the second guide surface 1302 and is finally introduced into the combustion chamber 20 through the outlet 122 of the output section. Another part of the airflow enters the combustion chamber 20 directly through the diversion port 141 after passing through the second guide surface 1302. A portion of the airflow is diverted to the connection 142 between the diversion port 141 and the outlet 122 of the output section, so that the gas enters the combustion chamber 20 evenly and reduces the situation of excessive or insufficient local combustion.

[0111] Specifically, the connection between the bend and the inlet of the output section is shielded by the projection of the diversion port 141 in the vertical direction, which can prevent the airflow from the bend from flowing directly upward into the combustion chamber. Instead, part of the airflow enters the combustion chamber from the diversion port 141, and the other part is blocked and flows to the side where the connection port 142 and the outlet of the output section are located. It then flows into the combustion chamber through the connection port 142 and the outlet of the output section, so as to achieve the effect of dispersing the airflow in the length direction of the combustion chamber.

[0112] Based on this, the present invention further provides that the width of the connecting part 142 gradually decreases along the direction away from the outlet of the output section, the width of the diversion port 141 is equal to the width of the end of the connecting part 142 away from the outlet of the output section, and the width of the outlet of the output section is equal to the width of the end of the connecting part 142 close to the outlet of the output section. This can further improve the uniformity of the diffusion of the mixed gas in the length direction of the combustion chamber, thereby enabling the flames on the top wall of the combustion chamber to be evenly distributed.

[0113] Preferably, in this embodiment, the upper pipe wall of the output section 12, which is connected to the upper end of the second guide surface 1302, extends upward at an angle, and the upper end of the upper pipe wall is higher than the bottom wall of the combustion chamber 20. After the airflow passes through the bend 13, part of the airflow flows along the second guide surface 1302 to the output section 12 and is further guided along the inclined upper pipe wall, so that the airflow gradually adjusts its flow direction before entering the combustion chamber 20, avoiding flow separation and wall adhesion effects caused by abrupt changes in direction, thereby reducing the intensity of turbulence. At the same time, since the upper end of the upper pipe wall is higher than the bottom wall of the combustion chamber 20, the airflow can obtain a more stable flow path when entering the combustion chamber 20, reducing local airflow backflow and the formation of turbulent regions, and improving combustion stability.

[0114] like Figures 1 to 11As shown, in this embodiment, the burner is installed inside the water heater to provide a stable and efficient combustion heat source.

[0115] Of course, the burner in this embodiment is not only suitable for water heaters, but can also be installed in other equipment that requires stable combustion, such as gas-fired boilers.

[0116] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present utility model. The implementation schemes in the above embodiments can be further combined or replaced. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A burner grate for a burner, characterized in that, It includes an integrally formed shell (1), an airflow channel (10) and a long strip-shaped combustion chamber (20) connected to the airflow channel (10), and flame exhaust holes of the burner are arranged on the top wall (201) of the combustion chamber (20); the top wall (201) of the combustion chamber (20) protrudes upward in the middle, and its two sides bend downward or extend obliquely from the middle.

2. The burner grate for a burner according to claim 1, characterized in that, The exhaust holes are arranged from the middle of the top wall (201) to both sides until they are close to the lower edge of both sides of the top wall (201).

3. The burner grate for a burner according to claim 2, characterized in that, The top wall (201) includes multiple sections with exhaust holes, the multiple sections are arranged at intervals along the length of the combustion chamber (20), and the exhaust holes are evenly arranged in each section; Alternatively, the exhaust port may include: The first row of flame holes (2011) are arranged or extended obliquely from both sides of the bisector of the top wall (201) to the lower edge of both sides of the top wall (201). The second row of flame holes (2012) are arranged at intervals along the bisector of the top wall (201).

4. The burner grating for a burner according to claim 3, characterized in that, The first flame holes (2011) are provided with multiple sets arranged at intervals along the bisector of the top wall (201). The arrangement path of each set of first flame holes (2011) is symmetrical with respect to the bisector of the top wall (201). The projection of the arrangement path of the first flame holes (2011) and the bisector of the top wall (201) onto the horizontal plane forms an acute angle.

5. The burner grate for a burner according to claim 4, characterized in that, The first exhaust port (2011) includes a strip-shaped port extending along the arrangement path, and / or the first exhaust port (2011) includes circular ports arranged along the arrangement path.

6. The burner grate for a burner according to claim 4 or 5, characterized in that, Multiple sets of first-row flame holes (2011) are evenly arranged along the bisector of the top wall (201); or, At least two sets of first flame exhaust holes (2011) arranged at intervals along the bisector of the top wall (201) constitute a unit. The arrangement interval of the first flame exhaust holes (2011) of two adjacent units is the first interval, and the arrangement interval between two adjacent first flame exhaust holes (2011) within a unit is the second interval. The first interval is greater than the second interval.

7. The burner grate for a burner according to claim 6, characterized in that, The interval between two adjacent second row flame holes (2012) is less than or equal to the interval between two adjacent first row flame holes (2011); In the horizontal direction perpendicular to the bisector of the top wall (201), the second flame exhaust hole (2012) is arranged correspondingly to or intersecting with the first flame exhaust hole (2011).

8. The burner grating for a burner according to any one of claims 1 to 5, characterized in that, The top wall (201) is symmetrical with respect to the vertical plane containing its bisector; The top wall (201) is an arc surface that curves downward on both sides. The central angle corresponding to the arc surface is less than or equal to 180°. The central angle corresponding to the area with exhaust holes on the top wall (201) is between 90° and 130°. Alternatively, the top wall may have a pointed structure with a pointed protrusion in the middle and downward sloping extensions on both sides; or the top wall may have a horizontal extension in the middle and downward sloping extensions on both sides.

9. A burner, characterized in that, The burner is equipped with a burner grating as described in any one of claims 1 to 8.

10. A water heater, characterized in that, It is equipped with the burner as described in claim 9.

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