EP4273449A1 - Burner bar, manufacturing method therefor, burner, and water heater - Google Patents

Burner bar, manufacturing method therefor, burner, and water heater Download PDF

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Publication number
EP4273449A1
EP4273449A1 EP22774353.1A EP22774353A EP4273449A1 EP 4273449 A1 EP4273449 A1 EP 4273449A1 EP 22774353 A EP22774353 A EP 22774353A EP 4273449 A1 EP4273449 A1 EP 4273449A1
Authority
EP
European Patent Office
Prior art keywords
fire grate
top portion
ventilation channel
flame stabilizing
dividing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP22774353.1A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP4273449A4 (en
Inventor
Wenfeng Chen
Jin Wang
Guorong LIANG
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Midea Group Co Ltd
Wuhu Midea Kitchen and Bath Appliances Manufacturing Co Ltd
Original Assignee
Midea Group Co Ltd
Wuhu Midea Kitchen and Bath Appliances Manufacturing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Midea Group Co Ltd, Wuhu Midea Kitchen and Bath Appliances Manufacturing Co Ltd filed Critical Midea Group Co Ltd
Publication of EP4273449A1 publication Critical patent/EP4273449A1/en
Publication of EP4273449A4 publication Critical patent/EP4273449A4/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/26—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid with provision for a retention flame
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/18—Arrangement or mounting of grates or heating means
    • F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/0027—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters using fluid fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
    • F23D14/04—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner
    • F23D14/045—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner with a plurality of burner bars assembled together, e.g. in a grid-like arrangement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
    • F23D14/04—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner
    • F23D14/10—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner with elongated tubular burner head
    • F23D14/105—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner with elongated tubular burner head with injector axis parallel to the burner head axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/12—Radiant burners
    • F23D14/14—Radiant burners using screens or perforated plates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/12—Radiant burners
    • F23D14/14—Radiant burners using screens or perforated plates
    • F23D14/145—Radiant burners using screens or perforated plates combustion being stabilised at a screen or a perforated plate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/48—Nozzles
    • F23D14/58—Nozzles characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/48—Nozzles
    • F23D14/58—Nozzles characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration
    • F23D14/583—Nozzles characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration of elongated shape, e.g. slits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/18—Arrangement or mounting of grates or heating means
    • F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
    • F24H9/1832—Arrangement or mounting of combustion heating means, e.g. grates or burners
    • F24H9/1836—Arrangement or mounting of combustion heating means, e.g. grates or burners using fluid fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2203/00—Gaseous fuel burners
    • F23D2203/10—Flame diffusing means
    • F23D2203/103—Flame diffusing means using screens
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2212/00—Burner material specifications
    • F23D2212/20—Burner material specifications metallic
    • F23D2212/201—Fibres
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2213/00—Burner manufacture specifications
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/18—Arrangement or mounting of grates or heating means

Definitions

  • the disclosure relates to a technical field of fluid heating equipment, in particular to a fire grate and a manufacturing method thereof, a burner and a water heater.
  • a burner is a core component of a water heater.
  • An existing burner of the water heater may use fully premixed combustion technology, rich-lean combustion technology or water-cooling combustion technology in terms of low nitrogen oxides combustion technology, while a structure of fire port of the existing burner usually adopts a single strip-shaped structure of fire port. Due to a small area of fire port of the single strip-shaped structure of fire port, a burning intensity of the fire port is high, and a performance of a flue gas emitted by instantly combusted fuels is not good, resulting in that a content of nitrogen oxides is high, and performance requirements of low nitrogen emission cannot be met. Thus, it is necessary to improve a structure of a fire grate of the existing burner.
  • the main purpose of the present invention is to propose a fire grate, aiming to solve a technical problem that a content of nitrogen oxides contained in a flue gas is relatively high due to an insufficient combustion of combustion gas in a burner, causing relatively great pollution to the environment.
  • the fire grate proposed by the present invention may comprise:
  • the metal mesh is located below the dividing hole.
  • the dividing hole comprises a plurality of first dividing holes and a plurality of second dividing holes, an open area of the first dividing hole being larger than an open area of the second dividing hole.
  • the plurality of first dividing holes and the plurality of the second dividing holes are arranged at an interval along a length direction of the top portion of the fire grate body.
  • the plurality of first dividing holes and the plurality of the second dividing holes are alternately arranged at an interval along a length direction of the top portion of the fire grate body.
  • the second dividing hole comprises a plurality of sub-dividing holes, the plurality of sub-dividing holes being arranged along a width direction of the top portion of the fire grate body.
  • the flame stabilizing device is also provided with a reinforcement rib at the opening.
  • the reinforcement rib is fixedly connected to the metal mesh, or the reinforcement rib is fixedly connected to the top portion of the fire grate body.
  • an edge of at least one layer of metal mesh is bent to form a bent part.
  • the top portion of the fire grate body is plate-shaped, the fire grate body having two side plates extending from the top portion to a same side of the top portion, the ventilation channel being formed between the two side plates, the side plate having a gas outlet thereon to communicate the ventilation channel to the gap.
  • a flow passing area at the gas outlet gradually increases from the ventilation channel to the gap.
  • the disclosure also discloses a manufacturing method of a fire grate, and the manufacturing method of a fire grate comprises the following steps:
  • the step of shaping the metal plate to form a fire grate body with a ventilation channel and a dividing hole, the dividing hole being located at a top portion of the fire grate body and in communication with the ventilation channel comprises:
  • the step of stamping the two side plates to form the ventilation channel between the two side plates comprises:
  • the following step is further comprised: forming a gas outlet at a preset position of the two side plates, to cause the ventilation channel to be in communication with the gap after the flame stabilizing device is sleeved on the upper portion of the fire grate body.
  • the present invention also discloses a burner and a water heater comprising the burner.
  • the burner comprises the aforementioned fire grate.
  • the fire grate comprises a fire grate body, a flame stabilizing device and a metal mesh.
  • the fire grate body is formed with a ventilation channel.
  • a top portion of the fire grate body is provided with a dividing hole communicating with the ventilation channel.
  • An opening corresponds to the dividing hole.
  • the flame stabilizing device is sleeved on an upper portion of the fire grate body.
  • a cavity with a top surface as an opening is formed within the flame stabilizing device.
  • the metal mesh is attached onto the fire grate body at a position corresponding to the dividing hole.
  • the top portion of the fire grate is provided with a structure of fire port and a flame stabilizing device, and the structure of fire port is formed by combining the dividing hole with a larger open area and the metal mesh.
  • a flue gas emission performance of instant combustion can be better, and the nitrogen oxides generated can be reduced.
  • a dual flame stabilizing effect can be formed, thus an adaptability range of a combustion thermal load of a single piece of fire grate can be increased, and the usage problem that a small load of the adaptability range of the combustion thermal load of the single piece of fire grate cannot be lowered can be solved.
  • the number of segments of the fire grate 10 can be reduced, thus a simple structure, a convenient manufacture, and a low cost can be achieved. A usage requirement of a whole machine for low nitrogen emission can be met.
  • Reference number Name Reference number Name 10 fire grate 122 second dividing hole 100 fire grate body 122a sub-dividing hole 130 top portion of the fire grate body 200 flame stabilizing device 140 side plate 210 cavity 150 gas outlet 211 opening 110 ventilation channel 212 gap 120 dividing hole 220 reinforcement rib 121 first dividing hole 300 metal mesh 230 lateral convex hull 231 external convex hull 232 inner convex hull 240 flame guiding part 201 flame stabilizing sheet 310 bent part
  • the directional indications are only used to explain a relative position relationship and/or a state of motion or the like among various components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.
  • a fire grate 10 comprises: a fire grate body 100, a flame stabilizing device 200 and a metal mesh 300.
  • the fire grate body 100 is formed with a ventilation channel 110, and a top portion 130 of the fire grate body 100 is provided with a dividing hole 120 communicating with the ventilation channel 110.
  • the flame stabilizing device 200 is sleeved on an upper portion of the fire grate body 100, and a cavity 210 with a top surface as an opening 211 is formed within the flame stabilizing device 200.
  • a gap 212 is formed between a side wall of the cavity 210 and a surface of the fire grate body 100, and the gap 212 is in communication with the ventilation channel 110.
  • the metal mesh 300 is attached onto the fire grate body 100 at a position corresponding to the dividing hole 120.
  • the fire grate 10 is mainly used on a burner, and the fire grate 10 is one of core components of the burner.
  • the fire grate 10 comprises a fire grate body 100, a flame stabilizing device 200 and a metal mesh 300.
  • a ventilation channel 110 is formed within the fire grate body 100, and the ventilation channel 110 has a gas inlet.
  • the gas inlet is usually connected to an airflow source, and the airflow source comprises an air and a combustion gas.
  • the combustion gas and air enter the ventilation channel 110 from the gas inlet.
  • the combustion gas and air are pre-mixed within the ventilation channel 110, then completely mixed and divided by the metal mesh 300 or the dividing hole 120, finally ignited at the top portion 130 of the fire grates 10, and then a stable and uniform flame is formed.
  • an open area of the dividing hole 120 of the present invention is larger than that of an existing common thin and long strip-shaped dividing hole, and generally is between 5 times to 100 times than that of the current common dividing hole, exemplarily, comprising but not limited to 5 times, 6 times, 8 times, 10 times, 20 times, 30 times, 40 times, 50 times, 60 times, 70 times, 80 times, 90 times and 100 times.
  • the dividing hole 120 may be of circular, ellipse, square or other regular or irregular shape designs. The following uses the square design as an example to introduce.
  • a metal mesh is attached onto the fire grate body 100, and the metal mesh is arranged corresponding to the dividing hole 120.
  • the metal mesh is arranged corresponding to the dividing hole 120.
  • the number of layers of metal meshes 300 is negatively related with the mesh number of the metal mesh 300, that is, the number of layers of metal meshes with a large mesh number is relatively small, and the number of layers of metal meshes with a small mesh number is relatively large.
  • the number of layers of metal meshes 300 comprises but is not limited to 2-10 layers. In some embodiments, it may be 2 layers, 3 layers, 5 layers, 8 layers or 10 layers.
  • the mesh number of the metal mesh commonly used ranges from 20 meshes to 100 meshes. In some embodiments, it may be 20 meshes, 40 meshes, 50 meshes, 60 meshes, 80 meshes or 100 meshes.
  • an optimal combination of the number of layers and the mesh number for the metal mesh 300, after a test and research, is 50 meshes and 3 layers.
  • the metal mesh 300 is attached on the top portion 130 of the fire grate body, and at the same time, the open area of the dividing hole 120 is increased, so that the flue gas emission performance of the fire grate 10 on condition of instant combustion is better, and the nitrogen oxides generated can be reduced.
  • a flame stabilizing function is realized by using the metal mesh 300 as a main structure of the fire port, thus an adaptability range of a combustion thermal load of a single piece of fire grate 10 can be increased, which can solve the usage problem that a small load of the adaptability range of the combustion thermal load cannot be lowered.
  • the number of segments of the fire grate 10 can be reduced, thus a simple structure, a convenient manufacture, and a low cost can be achieved.
  • the usage requirement of low nitrogen emission for a whole machine can be met.
  • the metal mesh 300 is attached onto the fire grate body 100 at a position corresponding to the dividing hole 120.
  • the metal mesh 300 may be attached to an interior of the fire grate body 100 at a position corresponding to the dividing hole 120, that is, the metal mesh 300 is actually located within the ventilation channel 110.
  • the metal mesh 300 may also be attached to an outer surface of the fire grate body 100 at a position corresponding to the dividing hole 120, that is, the metal mesh 300 is located between a top of the flame stabilizing device 200 and the top portion 130 of the fire grate body 100, and disposed against the top portion 130 of the fire grate body 100.
  • an airflow consisted of a mixture of air and combustion gas from the ventilation channel 110 is divided by the metal mesh 300 for a first time, then is fully divided and mixed by the metal mesh 300, and finally, burns above the dividing hole 120 to form a stable and uniform flame.
  • the metal mesh 300 will be used longer. At the same time, the flame will burn more completely because of the metal mesh 300, and the flame is relatively uniform and stable.
  • the airflow consisted of a mixture of air and combustion gas from the ventilation channel 110 is divided by the dividing hole 120 for a first time, then is fully divided and mixed by the metal mesh 300, and finally burns above the metal mesh 300 to form a stable and uniform flame.
  • a damage to the metal mesh 300 will be greater, but a combustion of the combustion gas is more sufficient than the previous embodiments, and the flame is more uniform and stable.
  • the dividing hole 120 may divide the flame, or may divide the airflow consisted of a mixture of air and combustion gas, which depends on an installation position of the metal mesh 300.
  • the fire grate 10 also comprises a flame stabilizing device 200, and the flame stabilizing device 200 is sleeved on an upper portion of the fire grate body 100.
  • a cavity 210 with a top surface as an opening 211 is formed within the flame stabilizing device 200, and the opening 211 corresponds to the dividing hole 120.
  • a first scheme for configuring the flame stabilizing device 200 is to dispose a flame guiding part 240 at the opening 211 of the flame stabilizing device 200.
  • the flame guiding part 240 is disposed in a width direction of the top portion 130 of the fire grate body, and the flame guiding part 240 is formed to extend upward and outwards relative to a horizontal direction.
  • the flame guiding part 240 can play a role in guiding a side flame formed at the dividing hole 120, thus the side flame can be caused to be gathered toward a target area of the fire grate 10, and it is beneficial to improve a heat accumulation effect in a combustion process.
  • a second scheme for configuring the flame stabilizing device 200 is that, by configuring an overall structure of the flame stabilizing device 200, a gap 212 is formed between the side wall of the cavity 210 and the surface of the fire grate body 100, the gap 212 being in communication with the ventilation channel 110.
  • a gas outlet space is increased, and in turn a resistance endured by the air flow can be reduced.
  • the gap 212 should not be too large, and is expected to be between 2 mm and 20 mm.
  • the gap 212 may be, comprising but not limited to 2 mm, 3 mm, 4 mm, 6 mm, 8 mm, 10 mm, 12 mm, 14 mm, 16 mm, 18 mm, and 20 mm.
  • a dividing device of a burner in the related art is usually provided with a plurality of strip-shaped dividing holes of a same shape.
  • an overall flow area of the dividing device as a whole is small, resulting in a high pressure of a mixed gas flowing through the dividing device and an too high combustion intensity of the mixed gas during a combustion process.
  • a combustion of the mixed gas is incomplete, resulting in a higher content of the nitrogen oxides formed during the combustion process.
  • processing a plurality of strip-shaped dividing holes on the dividing device leads to a relatively complicated structure of the dividing device, thus there are defects of a high processing difficulty and a low processing efficiency.
  • the top portion 130 of the fire grates 10 is provided with a fire port structure and a flame stabilizing device 200, the fire port structure being formed by combining the dividing hole 120 with a larger open area and the metal mesh 300.
  • the fire port structure being formed by combining the dividing hole 120 with a larger open area and the metal mesh 300.
  • the flue gas emission performance on condition of instant combustion can be better, and the nitrogen oxides generated can be reduced.
  • a dual flame stabilizing effect can be generated by adopting the metal mesh 30 and the flame stabilizing device 2, thus the adaptability range of the combustion thermal load of a single piece of fire grate 10 can be increased.
  • the usage problem that a small load of the adaptability range of the combustion thermal load cannot be lowered can be solved.
  • the number of segments of the fire grate 10 can be reduced, thus a simple structure, a convenient manufacture, and a low cost can be achieved.
  • the usage requirement of low nitrogen emission for a whole machine can be met.
  • the dividing holes 120 are arranged at intervals along a length direction of the top portion 130 of the fire grate body.
  • the dividing holes 120 comprise a plurality of first dividing holes 121 and a plurality of second dividing holes 122.
  • the plurality of first dividing holes 121 and the plurality of the second dividing holes 122 are arranged at intervals along the length direction of the top portion 130 of the fire grate body.
  • the plurality of first dividing holes 121 and the plurality of the second dividing holes 122 are alternately arranged at intervals along the length direction of the top portion 130 of the fire grate body.
  • the second dividing holes 122 comprise a plurality of sub-dividing holes 122a.
  • the plurality of sub-dividing holes 122a are arranged along a width direction of the top portion 130 of the fire grate body.
  • the open area of the first dividing holes 121 is larger than the open area of the second dividing holes 122. In this way, by configuring the dividing holes 120 with different open areas, the area of secondary time contact of combustion gas with the air can be increased.
  • the metal mesh 300 may be stacked in various ways, for example, in a way of rolling shutter shape or S shape and so on. It is worth mentioning that, in order to increase a strength of the metal mesh 300 and improve a combustion stability of the flame, edges of two opposite sides of each layer of metal mesh are bent to form a bent part 310. A tension will be generated at the bent part 310, and the strength of the metal mesh after being bent is higher.
  • a bent edge may be two sides in the width direction, or may be two sides in the length direction.
  • the bent parts 310 at two ends in the length direction of the metal mesh have a greater tension, and the strength of the metal mesh can also be greater.
  • the bent part 310 of each layer of metal mesh is connected to the bent part 310 of another layer or to another layer of metal mesh, and a gap is formed between adjacent two layers of metal mesh. In this way, the resistance endured by the airflow flowing through the metal mesh can be reduced to ensure an adequate airflow.
  • the flame stabilizing device 200 is also provided with reinforcement ribs 220 at the opening 211.
  • the reinforcement ribs 220 are fixedly connected to the metal mesh 300, or the reinforcement ribs 220 are fixedly connected to the top portion 130 of the fire grate body 100.
  • the flame stabilizing device 200 comprises two side plates disposed to be snapped with each other. The two side plates are respectively provided with lateral convex hulls 230, and the lateral convex hulls 230 are arranged at intervals along the length direction of the flame stabilizing device 200.
  • the lateral convex hull 230 comprise an inner convex hull 232 and at least two external convex hulls 231.
  • the inner convex hull 232 protrudes toward the cavity 210, and the at least two external convex hulls 231 protrude toward an outside of the fire grate 10.
  • the inner convex hull 232 is disposed between the at least two external convex hulls 231.
  • the two side plates are respectively named as a first side plate and a second side plate for introduction.
  • the first side plate and the second side plate can be snapped with each other, and the plurality of lateral convex hulls 230 are respectively provided along the length direction of the first side plate and the second side plate.
  • the plurality of lateral convex hulls 230 are arranged at intervals along the length direction of the first side plate or the second side plate.
  • the lateral convex hull 230 comprises an inner convex hull 232 and at least two external convex hulls 231.
  • the inner convex hull 232 protrudes toward the cavity 210.
  • a protruding direction of the at least two external convex hulls 231 is opposite to that of the inner convex hull 232.
  • such design of the inner convex hull 232 and external convex hulls 231 can firstly facilitate a positioning of the flame stabilizing device 200 during mounting, and secondly cause a ventilation channel to be formed between the flame stabilizing device 200 and an outer wall of the cavity 210.
  • the external convex hulls 231 guarantee a secondary air intake channel between the fire grates 10.
  • the convex hull of the first side plate and the lateral convex hull 230 of the second side plate are distributed symmetrically in the width direction of the fire grate body 100.
  • the first side plate and the second side plate are provided with a flame guiding part 240 extending upward.
  • the flame guiding part 240 can be formed by a top edge of the first side plate and a top edge of the second side plate extending upward and outward along a vertical direction. By disposing the flame guiding part 240 on the top edge of the first side plate and the second side plate, the flame guiding part 240 can play a role in guiding a formation of the flame at the top edge of the side plate, thus the side flame can be caused to be gathered toward a center of a single piece of fire grate 10, facilitating the improvement of the heat accumulation effect in the combustion process.
  • the top portion 130 of the fire grate body 100 is plate-shaped, and the fire grate body 100 has two side plates 140 extending from the top portion 130 to the same side of the top portion 130.
  • the ventilation channel 110 is formed between the two side plates.
  • the side plate has a gas outlet 150 thereon to communicate the ventilation channel 110 to the gap 212.
  • the gas outlet space of the mixed gas is increased on both sides, to facilitate a resistance endured by a mixed air flow to be reduced, thus mixed air flow can be enabled to stay above the fire grate 10 for a slightly longer time, and thus the combustion rate of the combustion gas is further improved and a content of nitrogen after gas combustion is further reduced.
  • a plurality of the gas outlets 150 are arranged at intervals on the side plate along the length direction of the top portion 130 of the fire grate body.
  • a flow passing area of the gas outlet 150 gradually increases from the ventilation channel 110 to the gap 212. That is to say, the gas outlet 150 is designed in a trumpet shape.
  • a portion on which the gas outlet 150 is located protrudes toward the ventilation channel 110 to further reduce the resistance endured by the mixed airflow.
  • the present invention also provides a method for manufacturing the fire grate 10, that is, how to manufacture the aforementioned fire grate 10.
  • the method for manufacturing the fire grate 10 comprises the following steps that:
  • the metal plate is shaped to form the fire grate body 100 with the ventilation channel 110 and the dividing hole 120, and the metal plate is a relatively thin metal plate which needs to have certain properties of rigidity and high temperature resistance. Then the metal plate is shaped according to a preset shape, to cause the metal plate to form a preliminary shape of the fire grate body 100. Finally other three sides of the metal plate are cut, and then other three sides of the metal plate are snapped with one another to form the fire grate body 100 which has the ventilation channel 110 and the dividing hole 120.
  • the metal mesh 300 may be attached to an interior of the fire grate body 100 at a position corresponding to the dividing hole 120, that is, the metal mesh 300 is actually located within the ventilation channel 110.
  • the metal mesh 300 may also be attached to an outer surface of the fire grate body 100 at a position corresponding to the dividing hole 120, that is, the metal mesh 300 is located between a top portion of the flame stabilizing device 200 and the top portion 130 of the fire grate body 100, and disposed against the top portion 130 of the fire grate body 100.
  • the metal mesh 300 In an embodiment in which the metal mesh 300 is attached to the interior of the fire grate body 100, before other three sides of the metal plate are snapped to one another to form the fire grate body 100 which has the ventilation channel 110 and the dividing hole 120, the metal mesh 300 needs to be fixed firstly onto the fire grate body 100 at a position corresponding to the dividing hole 120. In an embodiment in which the metal mesh 300 is attached to the exterior of the fire grate body 100, the metal mesh 300 may be directly fixed onto the fire grate body 100 at a position corresponding to the dividing hole 120, or the metal mesh 300 may be directly fixed onto the flame stabilizing device 200, or the metal mesh 300 may be temporarily pre-mounted onto the flame stabilizing device 200 or the fire grate body 100.
  • the metal mesh 300 is fixed to the fire grate body 100 or the flame stabilizing device 200. That is to say, it is only necessary to ensure that the metal mesh 300 is attached onto the fire grate body 100 at a position corresponding to the dividing hole 120.
  • a flame stabilizing sheet 201 may also be similar to the above-mentioned thin metal plate.
  • One of the manufacturing methods of the flame stabilizing device 200 is to shape two original flame stabilizing sheets 201, then to wrap the upper portion of the fire grate body 100 from both sides of the fire grate body 100, and finally to snap the two flame stabilizing sheets together.
  • the flame stabilizing sheet 201 can also be a piece of metal plate.
  • the piece of metal plate is shaped according to a preset shape by stamping, bending and other processes to form an initial shape of the flame stabilizing device 200 which has a cavity 210 with a top surface as an opening 211, and then the flame stabilizing device 200 is sleeved onto the top portion 130 of the fire grate body 100, followed by snapping two ends of the one piece of metal plate to each other.
  • the flame stabilizing device 200 is provided with a reinforcement rib 220 at the opening 210.
  • the reinforcement rib 220 is usually fixedly connected to the metal mesh 300, or the reinforcement rib 220 is usually directly connected to the top portion 130 of the fire grate body 100.
  • the above-mentioned metal plates are generally thin iron plates.
  • Away of fixing the above-mentioned metal mesh 300 and the fire grate body 100, and a way of fixing the metal mesh 300 and the flame stabilizing device 200 comprise but are not limited to welding, which will not be described in details here. In some embodiments, in various ways of welding, a spot welding is preferred.
  • the manufacturing method of the present invention only needs processes such as stamping, bending and cutting, thus a reduced number of welding process ways are used; a machining process is simplified; and machining steps are reduced thereby improving a production efficiency of the fire grate 10.
  • a step that the metal plate is shaped to form a fire grate body 100 with a ventilation channel 110 and a dividing hole 120, the dividing hole 120 being located at a top portion 130 of the fire grate body 100 and being in communication with the ventilation channel 110 may comprise:
  • the dividing hole 120 may be firstly punched out at a predetermined position, or a position of the dividing hole 120 may be reserved first.
  • a reserved part as a central axis, the two ends of the metal plate are bent to a same side of the metal plate to form the top portion 130 of the fire grate body 100 and the two side plates 140 extending from the top portion 130 to the same side of the top portion 130.
  • the two side plates are stamped according to a preset shape and position of the ventilation channel 110, to cause the two side plates 140 after being snapped to form the ventilation channel 110.
  • the step that the two side plates are stamped to form the ventilation channel 110 between the two side plates 140 comprises that:
  • the edges of other three sides of the two side plates are cut, to cause an edge of one of the two side plates 140 to be wrapped with an edge of the other side plate, thus a tight fit between the edges of two side plates is strengthened, and in turn an airtightness of the ventilation channel 110 is ensured.
  • a gas outlet 150 is formed at a preset position of the two side plates, to cause the ventilation channel 110 to be in communication with the gap 212 after the flame stabilizing device 200 is sleeved on the upper portion of the fire grate body 100.
  • the present invention also proposes a burner.
  • the burner comprises the aforementioned fire grate 10.
  • a specific structure of the fire grate 10 refers to the above-mentioned embodiments. Since this burner adopts all technical solutions of all the above-mentioned embodiments, it has at least all the above-mentioned beneficial effects brought by the technical solutions of the embodiments, which will not be repeated here.
  • the burner may be other types of burners such as an atmospheric burner, a rich-lean burner, or a water-cooled burner.
  • the fire grate 10 may comprise two side plates that are snapped with each other.
  • the two side plates are respectively provided with a lateral convex hull 230.
  • the lateral convex hull 230 is disposed adjacent to a top of the side plate, thus flame stabilizing holes are formed by the opening 211 and the lateral convex hull 230.
  • the first side plate and the second side plate are respectively provided with a plurality of lateral convex hulls 230 adjacent to an edge of the top.
  • the plurality of lateral convex hulls 230 are arranged at intervals along the length direction of the first side plate or the second side plate.
  • a flow channel being in communication with the ventilation channel 110 is defined by an inner side of the lateral convex hull 230, and the flame stabilizing holes are formed within the flow channel by the opening 211 and the lateral convex hull 230.
  • Two rows of flame stabilizing holes on the first side plate and the second side plate are respectively located on both sides of the fire grate body 100, and the two rows of flame stabilizing holes are symmetrically distributed in the width direction of the fire grate 10.
  • the side flames formed at the two rows of flame stabilizing holes on both sides of flame dividing device can play a stabilizing role on the flame formed above the flame distribution device, thus a flame stability during the combustion process of the burner can be further improved.
  • the flame guiding part 240 may be formed by a top edge of the lateral convex hull 230 extending upward and outwards relative to a horizontal direction.
  • the flame guiding part 240 can play a role in guiding a side flame formed at the flame stabilizing hole, to cause the side flame to be gathered toward a central area of the fire grate 10, facilitating the improvement of the heat accumulation effect in the combustion process.
  • the present invention also proposes a water heater, which comprises the aforementioned burner.
  • the burner comprises the aforementioned fire grate.
  • a specific structure of the fire grate refers to the above-mentioned embodiments. Since this burner adopts all technical solutions of all the above-mentioned embodiments, it has at least all the above-mentioned beneficial effects brought by the technical solutions of the embodiments, which will not be repeated here.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Gas Burners (AREA)
  • Baking, Grill, Roasting (AREA)
EP22774353.1A 2021-03-25 2022-03-25 BURNER BAR, MANUFACTURING METHOD THEREFOR, BURNER AND WATER HEATER Pending EP4273449A4 (en)

Applications Claiming Priority (2)

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CN202120612600 2021-03-25
PCT/CN2022/083165 WO2022199700A1 (zh) 2021-03-25 2022-03-25 火排及其制造方法、燃烧器和热水器

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EP4273449A1 true EP4273449A1 (en) 2023-11-08
EP4273449A4 EP4273449A4 (en) 2024-06-05

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US (1) US20230408147A1 (zh)
EP (1) EP4273449A4 (zh)
CN (6) CN217302793U (zh)
WO (3) WO2023151158A1 (zh)

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CN115127104A (zh) 2022-09-30
CN217302792U (zh) 2022-08-26
CN217356881U (zh) 2022-09-02
CN217503668U (zh) 2022-09-27
WO2022199700A1 (zh) 2022-09-29
US20230408147A1 (en) 2023-12-21
CN217302793U (zh) 2022-08-26
WO2023151158A1 (zh) 2023-08-17
CN115200016A (zh) 2022-10-18
WO2023151159A1 (zh) 2023-08-17
EP4273449A4 (en) 2024-06-05

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