Fully premixed combustion device and gas equipment

Abstract

This utility model relates to the field of gas equipment technology, and discloses a fully premixed combustion device and gas equipment. The outer wall of the liquid cooling pipe is at least partially in contact with the inner wall of the corresponding receiving tank, which facilitates the transfer of heat energy from the flame orifice plate to the liquid cooling pipe, where it is absorbed by the medium flowing within the pipe. This reduces the temperature of the flame orifice plate, thereby lowering the probability of backfire. The outlet center axis of the flame orifice is perpendicular to the plane of the opening of the receiving tank, preventing the mixed gas entering the combustion chamber through the flame orifice from directly blowing onto the liquid cooling pipe. This avoids the accumulation of gas near the surface of the liquid cooling pipe, preventing combustion from occurring on its surface and reducing the thermal corrosion effect of the high-temperature flame on the pipe. It also slows down the heating rate of the medium inside the liquid cooling pipe, allowing it to flow out before vaporization, reducing internal pressure and extending the pipe's service life.

Description

Technical Field

[0001] This utility model relates to the field of gas equipment technology, and in particular to a fully premixed combustion device and gas equipment. Background Technology

[0002] A fully premixed burner mixes air and gaseous fuel in a certain proportion before combustion to form a mixed gas. The mixed gas burns rapidly and completely on the burner head surface, resulting in high combustion efficiency, fast combustion speed, and short flame. This effectively reduces the generation of thermal nitrogen oxides, achieves full and efficient combustion of fuel, and reduces harmful gas emissions.

[0003] To reduce pollutant emissions, related technologies propose using natural gas blended with other clean gaseous fuels or using clean gaseous fuels for combustion to meet emission requirements. During operation of a fully premixed combustion device, the surface temperature around the combustion surface of the burner orifices is high, resulting in more concentrated thermal stress. Clean gaseous fuels have characteristics such as low ignition energy, easy ignition, and rapid combustion speed, making backfire more likely to occur inside the burner head. This causes the flame to flow back into the premixing chamber along the airflow direction, leading to deflagration or detonation, increasing the probability of burner head damage, and in severe cases, even causing safety accidents.

[0004] To address this, existing technologies propose installing liquid-cooled pipes around the combustion surface of the burner's flame holes. The medium flowing within these pipes absorbs heat, reducing the burner's head temperature and thus lowering the probability of backfire. However, this exposes the liquid-cooled pipes directly to the high-temperature flame. The high flame corrodes the pipes, and the rapid vaporization of the cooling medium causes a rapid increase in pressure within the pipes. Over prolonged burner use, this can lead to pipe rupture and shorten the pipes' lifespan. Utility Model Content

[0005] One of the technical problems solved by this utility model is to provide a fully premixed combustion device that can reduce the probability of flame backfire, extend the service life of the liquid cooling pipe, and improve the safety performance of the fully premixed combustion device.

[0006] The second technical problem solved by this utility model is to provide a gas equipment that can reduce the probability of backfire, extend the service life of the gas equipment, and improve the safety performance of the gas equipment.

[0007] The fully premixed combustion device includes:

[0008] The burner shell has a hollow inner cavity that extends through the height direction;

[0009] The orifice plate divides the hollow inner cavity into a combustion chamber and a mixing chamber distributed along the height direction; the orifice plate has multiple receiving grooves and multiple orifices on the side facing the combustion chamber, and the multiple receiving grooves and multiple orifices are arranged alternately along the width direction of the burner shell. Each orifice has multiple orifices, and the mixing chamber communicates with the combustion chamber through the orifices. The central axis of the opening of each orifice is perpendicular to the plane where the opening of the receiving groove is located.

[0010] Multiple liquid cooling tubes extend along the length of the burner housing. The liquid cooling tubes are located inside the combustion chamber and correspond one-to-one with the receiving grooves. At least a portion of the liquid cooling tube is located inside the corresponding receiving groove, and at least a portion of the outer wall of the liquid cooling tube is in contact with the inner wall of the corresponding receiving groove.

[0011] The fully premixed combustion device described in this utility model has the following advantages compared with the prior art:

[0012] The fully premixed combustion device provided by this utility model allows the mixed gas in the mixing chamber to enter the combustion chamber through the flame hole and burn there. Since the outer wall of the liquid cooling pipe is at least partially in contact with the inner wall of the corresponding accommodating groove, it is beneficial for the heat energy on the flame hole plate to be transferred to the liquid cooling pipe and absorbed by the medium flowing inside the liquid cooling pipe, which can reduce the temperature of the flame hole plate and thus reduce the probability of backfire.

[0013] Because the central axis of the burner outlet is perpendicular to the plane of the opening of the receiving groove, the mixed gas entering the combustion chamber through the burner will not blow directly onto the liquid cooling pipe. This prevents the gas from accumulating near the surface of the liquid cooling pipe, thus reducing the thermal corrosion effect of the high-temperature flame on the liquid cooling pipe and extending its service life. Furthermore, it slows down the heating rate of the medium inside the liquid cooling pipe, allowing the medium to flow out of the liquid cooling pipe before it vaporizes, reducing the internal pressure of the liquid cooling pipe and further extending its service life.

[0014] The receiving groove is located on the side of the flame orifice plate facing the combustion chamber, and the liquid cooling pipe is located inside the receiving groove. This allows the liquid cooling pipe to be placed inside the combustion chamber and directly in the heat radiation zone of the flame, which helps to quickly reduce the temperature of the flame orifice plate. This not only helps to prevent high-temperature creep of the flame orifice plate, but also helps to reduce the temperature at the flame root and destroy the high-temperature generation zone of nitrogen oxides.

[0015] In one embodiment, along the height direction, the outer peripheral wall of the liquid-cooled pipe on the side away from the mixing chamber includes a liquid-cooled plane, which is perpendicular to the outlet center axis of the fire hole.

[0016] In one embodiment, the fire hole is a flat plate structure perpendicular to the height direction.

[0017] In one embodiment, the surface of the flame hole away from the mixing chamber is a combustion plane;

[0018] The liquid cooling plane is flush with the combustion plane; or, along the height direction, the liquid cooling plane is closer to the bottom wall of the receiving tank than the combustion plane.

[0019] In one embodiment, the receiving groove causes the fire hole plate to form a protrusion protruding from the fire hole on the side facing the mixing chamber.

[0020] In one embodiment, the burner housing includes a burner frame with the hollow inner cavity, a flow guide end cover, a liquid inlet end cover, and a liquid outlet end cover. The flow guide end cover is located on one side of the burner frame along the length direction and is sealed to the outer wall of the burner frame to form a flow guide chamber.

[0021] The liquid inlet cap is located on the other side of the burner frame along the length direction and is sealed to the outer wall of the burner frame to form an inlet chamber; the liquid outlet cap is located on the same side of the burner frame as the liquid inlet cap along the length direction and is sealed to the outer wall of the burner frame to form an outlet chamber.

[0022] The liquid inlet cap is connected to an inlet pipe connector that communicates with the inlet chamber, and the liquid outlet cap is connected to an outlet pipe connector that communicates with the outlet chamber.

[0023] In one embodiment, the liquid cooling pipe and the fire orifice plate are welded and fixed together;

[0024] And / or, the circumferential edge of the fire hole plate is folded to form an annular mounting flange, which is sealed and welded to the inner wall of the hollow cavity;

[0025] And / or, the flow guide end cap is sealed and welded to the outer wall of the burner frame;

[0026] And / or, the liquid inlet cap is sealed and welded to the outer wall of the burner frame;

[0027] And / or, the liquid outlet cap is sealed and welded to the outer wall of the burner frame;

[0028] And / or, the inlet pipe connector is sealed and welded to the liquid inlet end cap;

[0029] And / or, the outflow pipe joint is sealed and welded to the liquid outlet cap;

[0030] And / or, the liquid cooling pipe is sealed and welded to the burner frame.

[0031] In one embodiment, the fully premixed combustion device further includes an ultraviolet detector, which is mounted and fixed outside the burner housing; the burner housing has a light-transmitting window communicating with the combustion chamber, the light-transmitting window is fitted with quartz glass, and the detection end of the ultraviolet detector is located at the quartz glass.

[0032] In one embodiment, the fully premixed combustion device further includes:

[0033] A mixing housing is sealed to the burner housing, and the mixing housing blocks the opening of the mixing chamber to form a mixing cavity; the mixing housing is provided with an air inlet;

[0034] A porous medium structure is located inside the mixing chamber. The porous medium structure is positioned opposite to and spaced apart from the air inlet along the height direction. Along the flow path of the mixed gas, the air inlet, the flow channel within the porous medium structure, and the flame hole are sequentially connected.

[0035] The second technical problem mentioned above is solved by the following technical solution:

[0036] Gas-fired equipment, including the fully premixed combustion device provided in any of the above embodiments.

[0037] Compared with the prior art, the gas equipment described in this utility model has the following beneficial effects:

[0038] The gas equipment provided by this utility model, by adopting the above-mentioned fully premixed combustion device, can reduce the probability of flame backfire, extend the service life of the gas equipment, and improve the safety performance of the gas equipment. Attached Figure Description

[0039] Figure 1 A schematic diagram showing the disassembled state of the fully premixed combustion device provided in this embodiment of the utility model;

[0040] Figure 2 A first-view structural schematic diagram of the fully premixed combustion device provided in an embodiment of this utility model;

[0041] Figure 3 A cross-sectional view of the fully premixed combustion device provided in an embodiment of this utility model;

[0042] Figure 4 A schematic diagram of a perforated plate with a liquid cooling pipe installed, provided for an embodiment of this utility model;

[0043] Figure 5 A cross-sectional view of a fire-fighting plate with a liquid-cooled pipe installed, provided for an embodiment of this utility model;

[0044] Figure 6yes Figure 5 A magnified view of a portion of point Q;

[0045] Figure 7 A disassembled schematic diagram of the burner housing, liquid cooling pipe, and fire orifice plate provided for an embodiment of this utility model;

[0046] Figure 8 A second-view structural schematic diagram of the fully premixed combustion device provided in an embodiment of this utility model;

[0047] Figure 9 A third-view structural schematic diagram of the fully premixed combustion device provided in an embodiment of this utility model;

[0048] Figure 10 A first-view structural schematic diagram of a burner housing with liquid cooling pipes and a fire orifice plate provided for an embodiment of the present utility model;

[0049] Figure 11 A second-view structural schematic diagram of a burner housing with liquid cooling pipes and a fire orifice plate provided for an embodiment of this utility model;

[0050] Figure 12 A first cross-sectional view of a burner housing with liquid cooling pipes and a fire orifice plate provided for an embodiment of the present utility model;

[0051] Figure 13 This is a second cross-sectional view of a burner housing with a liquid cooling pipe and a fire orifice plate provided for an embodiment of the present invention.

[0052] Label Explanation:

[0053] 1. Burner shell; 11. Flange end plate; 12. Burner frame; 121. Light-transmitting window; 122. Observation window; 13. Flow guide end cover; 14. Liquid inlet end cover; 15. Liquid outlet end cover; 16. Inlet pipe connector; 17. Outlet pipe connector; 18. Detector bracket;

[0054] 2. Flame hole plate; 21. Receiving groove; 22. Mounting flange; 23. Flame hole section; 231. Flame hole; 232. Combustion plane;

[0055] 3. Liquid cooling pipes; 31. Liquid cooling plane;

[0056] 41. Quartz glass; 42. First sealing gasket; 43. First pressure plate; 44. Ultraviolet detector;

[0057] 51. Transparent glass; 52. Second sealing gasket; 53. Second pressure plate;

[0058] 6. Porous media structure; 7. Mixing shell; 71. Inlet top wall; 711. Inlet;

[0059] 8. Premixer; 9. Fan; 101. Ignition feedback needle; 102. Ignition seal;

[0060] 201. Insulation board; 202. Insulation pressure plate;

[0061] 301. Mixed seal; 302. Premixed seal; 303. Inlet seal;

[0062] 100. Mixing chamber; 200. Combustion chamber; 300. Flow guiding chamber; 400. Inlet chamber; 500. Outlet chamber. Detailed Implementation

[0063] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0064] In the description of this utility model, it should be understood that the terms "center", "length direction", "width direction", "height direction", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the 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.

[0065] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0066] 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0067] This utility model provides a fully premixed combustion device and a gas appliance. The gas appliance includes a fully premixed combustion device, and the gas can be natural gas, a mixture of natural gas and hydrogen, pure hydrogen, or other combustible gases. The gas appliance can be a wall-hung boiler, a gas water heater, a gas heater, or other gas-powered equipment.

[0068] like Figures 1 to 7 As shown, the fully premixed combustion device includes a burner housing 1, a flame perforation plate 2, and multiple liquid cooling pipes 3. The burner housing 1 has a hollow inner cavity extending along its height. The flame perforation plate 2 divides the hollow inner cavity into a combustion chamber 200 and a mixing chamber 100 distributed along the height. The side of the flame perforation plate 2 facing the combustion chamber 200 has multiple receiving grooves 21 and multiple flame perforations 23. The multiple receiving grooves 21 are sequentially distributed along the width of the burner housing 1, and the flame perforations 23 have multiple... The mixing chamber 100 is connected to the combustion chamber 200 through the flame hole 231. The central axis of the outlet of the flame hole 231 is perpendicular to the plane where the opening of the receiving groove 21 is located. The liquid cooling pipe 3 extends along the length of the burner housing 1. The liquid cooling pipe 3 is located in the combustion chamber 200. The liquid cooling pipe 3 corresponds to the receiving groove 21 one by one. The liquid cooling pipe 3 is at least partially located in the corresponding receiving groove 21. The outer wall of the liquid cooling pipe 3 is at least partially in contact with the inner wall of the corresponding receiving groove 21.

[0069] The mixed gas in the mixing chamber 100 enters the combustion chamber 200 through the flame hole 231 and burns in the combustion chamber 200. Since the outer wall of the liquid cooling pipe 3 is at least partially in contact with the inner wall of the corresponding receiving groove 21, it is beneficial for the heat energy on the flame hole plate 2 to be transferred to the liquid cooling pipe 3 and absorbed by the medium flowing in the liquid cooling pipe 3, which can reduce the temperature of the flame hole plate 2 and thus reduce the probability of flame backfire.

[0070] Since the outlet center axis of the flame hole 231 is perpendicular to the plane where the opening of the receiving groove 21 is located, the mixed gas entering the combustion chamber 200 through the flame hole 231 will not blow directly onto the liquid cooling pipe 3, so as to avoid the gas from accumulating near the surface of the liquid cooling pipe 3 and causing the combustion of the gas to occur on the surface of the liquid cooling pipe 3. This helps to reduce the thermal corrosion effect of the high temperature flame on the liquid cooling pipe 3 and extend the service life of the liquid cooling pipe 3. Moreover, it can slow down the heating rate of the medium inside the liquid cooling pipe 3, which is conducive to the medium inside the liquid cooling pipe 3 flowing out of the liquid cooling pipe 3 before it is vaporized, reducing the internal pressure of the liquid cooling pipe 3, thereby further extending the service life of the liquid cooling pipe 3.

[0071] The receiving groove 21 is located on the side of the flame orifice plate 2 facing the combustion chamber 200, and the liquid cooling pipe 3 is located inside the receiving groove 21. This allows the liquid cooling pipe 3 to be placed inside the combustion chamber 200 and directly placed in the heat radiation zone of the flame, which helps to quickly reduce the temperature of the flame orifice plate 2. This not only helps to prevent the flame orifice plate 2 from undergoing high-temperature creep, but also helps to reduce the temperature at the root of the flame and destroy the high-temperature generation zone of nitrogen oxides.

[0072] For example, the medium flowing through the liquid cooling pipe 3 is water, which can prevent the water from boiling over too quickly and causing scale formation. It should be noted that the medium flowing through the liquid cooling pipe 3 is not limited to water, but can also be other heat exchange media, such as ethanol.

[0073] In some embodiments, such as Figures 4 to 6 As shown, along the height direction, the outer peripheral wall of the liquid cooling pipe 3 on the side away from the mixing chamber 100 includes a liquid cooling plane 31, which is perpendicular to the outlet center axis of the fire hole 231.

[0074] For the design where the liquid cooling pipe 3 extends into the receiving groove 21 along the height direction on the side away from the mixing chamber 100, this arrangement prevents the liquid cooling plane 31 from having a guiding effect, further reducing the amount of gas flowing directly from the mixed gas entering the combustion chamber 200 through the flame hole 231 to the liquid cooling pipe 3. Regardless of whether the side of the liquid cooling pipe 3 away from the mixing chamber 100 extends into the receiving groove 21 along the height direction, it helps to reduce the outer surface area of ​​the portion of the liquid cooling pipe 3 placed in the combustion chamber 200 that is not in contact with the receiving groove 21, thereby reducing the outer surface area of ​​the liquid cooling pipe 3 that can be radiated by flame heat and reducing the impact of flame thermal corrosion on the lifespan of the liquid cooling pipe 3.

[0075] In some embodiments, such as Figures 4 to 6 As shown, the flame port 23 is a flat plate structure perpendicular to the height direction, and the central axis of the flame port 231 extends along the height direction. This effectively prevents the mixed gas entering the combustion chamber 200 through the flame port 231 from directly blowing onto the liquid cooling pipe 3, reducing the thermal corrosion effect of the high-temperature flame on the liquid cooling pipe 3.

[0076] In some embodiments, such as Figure 4 and Figure 5As shown, the surface of the flame port 23 away from the mixing chamber 100 is the combustion plane 232, and the liquid cooling plane 31 is flush with the combustion plane 232. This arrangement can minimize the amount of gas flowing directly from the mixed gas entering the combustion chamber 200 through the flame port 231 to the liquid cooling pipe 3 while ensuring the contact area between the liquid cooling pipe 3 and the inner wall of the receiving tank 21. This reduces the impact of flame thermal corrosion on the service life of the liquid cooling pipe 3 and extends its service life. It also helps to reduce the outer surface area of ​​the liquid cooling pipe 3 that can be radiated by flame heat, thus reducing the impact of flame thermal corrosion on the service life of the liquid cooling pipe 3. Furthermore, it helps to reduce the minimum distance between the flame port 231 closest to the liquid cooling pipe 3 in the width direction and the liquid cooling pipe 3, thereby reducing the size of the flame port plate 2 in the second direction and thus reducing the size of the burner housing 1 in the second direction.

[0077] In other embodiments, the liquid-cooled plane 31 may be positioned closer to the bottom wall of the receiving tank 21 than the combustion plane 232 in the height direction; the combustion plane 232 may be positioned closer to the bottom wall of the receiving tank 21 than the liquid-cooled plane 31 in the height direction, i.e., the side of the liquid-cooled pipe 3 away from the mixing chamber 100 extends out of the receiving tank 21 in the height direction. In this case, the minimum distance between the flame hole 231 closest to the liquid-cooled pipe 3 in the width direction and the liquid-cooled pipe 3 may be appropriately increased to reduce the amount of gas flowing directly to the liquid-cooled pipe 3 in the mixed gas entering the combustion chamber 200 through the flame hole 231.

[0078] In some embodiments, such as Figures 4 to 6 As shown, the receiving groove 21 forms a protrusion on the side of the flame orifice plate 2 facing the mixing chamber 100, extending beyond the flame orifice 23. This arrangement increases the contact area between the portion of the liquid cooling pipe 3 placed within the receiving groove 21 and the inner wall of the receiving groove 21. Furthermore, the protrusion increases the surface area of ​​the side of the flame orifice plate 2 facing the mixing chamber 100, thereby increasing the contact area between the gas mixture in the mixing chamber 100 and the flame orifice plate 2. This facilitates the transfer of heat energy in the gas mixture through the bottom of the receiving groove 21 to the liquid cooling pipe 3, reducing the temperature of the gas mixture before combustion. The gas mixture enters the combustion chamber 200 through the flame orifice 231, which helps to slow down the flame propagation speed, reducing the probability of backfire and improving heat transfer efficiency. Specifically, forming the receiving groove 21 by stamping improves the structural strength of the flame orifice plate 2.

[0079] For example, the receiving groove 21 is an arc structure with its opening facing the combustion chamber 200, and the central angle of the arc structure is less than or equal to 180°.

[0080] In some embodiments, such as Figures 4 to 6As shown, the liquid cooling pipe 3 and the flame perforation plate 2 are welded and fixed together. This arrangement improves the connection stability between the liquid cooling pipe 3 and the flame perforation plate 2, reduces the possibility of the liquid cooling pipe 3 separating from the inner wall of the receiving tank 21 due to minor deformation of the liquid cooling pipe 3 and the flame perforation plate 2 under high temperature conditions, and ensures that the portion of the liquid cooling pipe 3 placed in the receiving tank 21 always maintains surface contact with the inner wall of the receiving tank 21. This allows the medium flowing in the liquid cooling pipe 3 to effectively absorb the heat energy of the flame perforation plate 2, reduce the flame temperature and flame propagation rate, reduce the probability of backfire, and also help reduce the generation of thermal nitrogen oxides.

[0081] In some embodiments, such as Figures 4 to 7 As shown, the circumferential edge of the orifice plate 2 is folded to form an annular mounting flange 22, which is sealed and welded to the inner wall of the hollow cavity. Exemplarily, the mounting flange 22 is brazed to the inner wall of the hollow cavity, preventing combustion gases from entering the combustion chamber 200 from the circumferential edge of the orifice plate 2, reducing the flame at the circumferential edge of the orifice plate 2, and thus improving combustion efficiency. No sealing element is required, reducing the number of parts and lowering costs. Exemplarily, the circumferential edge of the orifice plate 2 is folded towards the side where the mixing chamber 100 is located to form the aforementioned mounting flange 22. Alternatively, the circumferential edge of the orifice plate 2 can also be folded towards the side where the combustion chamber 200 is located to form the aforementioned mounting flange 22.

[0082] In some embodiments, such as Figures 7 to 13 As shown, the burner housing 1 includes a burner frame 12 with a hollow inner cavity, a flow guide end cap 13, a liquid inlet end cap 14, and a liquid outlet end cap 15. The flow guide end cap 13 is located on one side of the burner frame 12 along its length and is sealed to the outer wall of the burner frame 12 to form a flow guide chamber 300. The liquid inlet end cap 14 is located on the other side of the burner frame 12 along its length and is sealed to the outer wall of the burner frame 12 to form an inlet chamber 400. The liquid outlet end cap 15 is located on the same side of the burner frame 12 as the liquid inlet end cap 14 along its length and forms an outlet chamber 500 with the outer wall of the burner frame 12. The liquid inlet end cap 14 is connected to an inlet pipe connector 16 communicating with the inlet chamber 400, and the liquid outlet end cap 15 is connected to an outlet pipe connector 17 communicating with the outlet chamber 500.

[0083] The external heat exchange medium enters the corresponding inlet chamber 400 through the inlet pipe joint 16, and then enters the guide chamber 300 through multiple liquid cooling pipes 3 connected to the inlet chamber 400. The heat exchange medium entering the guide chamber 300 enters the outlet chamber 500 through multiple liquid cooling pipes 3 connected to the outlet chamber 500, and then flows out.

[0084] For example, the inlet cap 14 and the outlet cap 15 are distributed along the width direction.

[0085] It should be noted that the connection method between multiple liquid cooling pipes 3 is not limited to the above arrangement. The guide end cap 13 can also be omitted, and the burner frame 12 can be arranged along the length direction between the liquid inlet end cap 14 and the liquid outlet end cap 15. Multiple liquid cooling pipes 3 can also be connected sequentially to form a serpentine channel.

[0086] In some embodiments, such as Figure 7 As shown, the flow guide end cap 13, the liquid inlet end cap 14, and the liquid outlet end cap 15 are all welded and fixed to the outer wall of the burner frame 12 in a sealing manner. For example, the fixing is achieved by brazing, eliminating the need for seals, thus achieving a sealed connection between each end cap and the burner frame 12. This reduces the number of parts and provides a good sealing effect.

[0087] In some embodiments, such as Figure 7 As shown, the burner frame 12 has two first sidewalls that are opposite to each other and spaced apart along its length. The first sidewalls have through holes for the liquid cooling pipe 3 to pass through. The inner circumferential wall of the through hole and the outer circumferential wall of the liquid cooling pipe 3 are sealed and welded together. For example, by using brazing for fixation, no sealing element is needed to achieve a sealed connection between the liquid cooling pipe 3 and the first sidewalls, which helps reduce the number of parts and provides a good sealing effect.

[0088] In some embodiments, such as Figure 7 As shown, a flange end plate 11 is connected to each end of the burner frame 12 in the height direction, facilitating the connection of the burner housing 1 to other structures. Exemplarily, the burner frame 12 and the flange end plates 11 are brazed together to ensure a sealed connection and prevent air leakage.

[0089] The burner housing 1 is fixed by brazing the two flange end plates 11, the burner frame 12, the flow guide end cover 13, the liquid inlet end cover 14, the liquid outlet end cover 15, the inlet pipe joint 16, and the outlet pipe joint 17 in one go according to the design requirements. This helps to reduce leakage points, ensure the sealing performance of the entire burner housing 1, and improve the structural strength of the burner housing 1.

[0090] In some embodiments, such as Figures 1 to 3 As shown, the fully premixed combustion device also includes a mixing shell 7 and a porous media structure 6. The mixing shell 7 is sealed to the burner shell 1 and forms a mixing cavity by blocking the opening of the mixing chamber 100. The mixing shell 7 is provided with an air inlet 711. The porous media structure 6 is located in the mixing cavity and is positioned opposite to and spaced apart from the air inlet 711 along the height direction. Along the flow path of the mixed gas, the air inlet 711, the flow channel in the porous media structure 6, the first gas passage and the flame hole 231 are sequentially connected.

[0091] The mixed gas enters the mixing cavity through the inlet 711. Because the porous media structure 6 is positioned opposite and spaced apart from the inlet 711 along its height, it ensures that the airflow is evenly distributed throughout the mixed cavity. The porous media structure 6, with its irregularly connected network of pores, allows for more uniform mixing of the mixed gas as it flows through these channels. This results in a more uniform distribution of the mixed gas near the flame plate 2, a more even pressure distribution, and consistent flow rates at each flame hole 231 on the flame plate 2. This improves the uniformity of thermal intensity on the surface of the flame plate 2 and enhances combustion stability.

[0092] The porous medium structure 6 also has a certain heat capacity. The larger the heat capacity, the stronger the ability of the porous medium structure 6 to absorb and store heat energy. Combined with the porosity and pore size distribution characteristics of the porous medium structure 6, it can effectively isolate more heat transfer and achieve a good heat insulation effect. Even if a flame backfire occurs, after the flame flows back into the mixing chamber 100 through the flame hole 231, the porous medium structure 6 is used for heat insulation to prevent the flame from continuing to spread backfire.

[0093] For ease of description, the side wall of the mixing housing 7 with the air inlet 711 is referred to as the air inlet top wall 71. Exemplarily, the air inlet 711 is located at the center of the air inlet top wall 71, which facilitates the airflow entering the mixing cavity through the air inlet 711 to flow in all directions, so that the airflow enters each area of ​​the porous medium structure 6 more evenly.

[0094] In some embodiments, such as Figures 1 to 3 As shown, the mixing housing 7 has an opening at one end facing the burner housing 1. The circumferential edge of the opening end of the mixing housing 7 is folded outward to form an annular flange. The annular flange and the burner housing 1 are connected by fasteners, and a mixing seal 301 is provided between the annular flange and the burner housing 1. By providing the mixing seal 301, the mixed gas in the mixing cavity can be prevented from leaking through the gap between the annular flange and the burner housing 1.

[0095] In some embodiments, a limiting protrusion is provided on the inner wall of the mixing housing 7, and the porous media structure 6 is sandwiched between the limiting protrusion and the fire hole plate 2 along the height direction, so that the porous media structure 6 is spaced apart from the air intake top wall 71 along the height direction.

[0096] In some embodiments, such as Figures 1 to 3As shown, the fully premixed combustion device also includes a premixer 8, which is installed at the end of the mixing housing 7 away from the burner housing 1. The mixing outlet and the air inlet 711 of the premixer 8 are connected. A premixing seal 302 is provided between the premixer 8 and the mixing housing 7. The premixing seal 302 surrounds the outer periphery of the mixing outlet and the outer periphery of the air inlet 711 to prevent the mixed gas from leaking through the gap between the premixer 8 and the mixing housing 7. The premixer 8 is used to mix the fuel gas and air to form a uniform combustible mixture, ensuring a more complete and stable combustion process, achieving efficient combustion and energy-saving effects.

[0097] The air inlet of the premixer 8 is connected to a fan 9, and an air inlet seal 303 is provided between the air inlet of the premixer 8 and the outlet of the fan 9 to prevent gas leakage.

[0098] In some embodiments, such as Figure 1 and Figure 2 As shown, the fully premixed combustion device also includes an ignition feedback needle 101. The ignition end of the ignition feedback needle 101 extends into the burner housing 1 and is located within the combustion chamber 200. The end of the ignition feedback needle 101 furthest from the ignition end is positioned outside the mixing housing 7, facilitating connection of the ignition feedback needle 101 to other structures. The ignition feedback needle 101 is used to release an electric arc to ignite the mixture and to provide feedback on the flame signal.

[0099] An ignition seal 102 is provided between the ignition feedback needle 101 and the outer wall of the burner housing 1 to prevent the gas from leaking out through the gap between the ignition feedback needle 101 and the burner housing 1.

[0100] In some embodiments, such as Figure 9 As shown, the fully premixed combustion device also includes an ultraviolet detector 44 for monitoring whether there is a flame in the combustion chamber 200. It is particularly suitable for fully premixed combustion devices that use hydrogen mixed with gas or pure hydrogen for combustion. Since the combustion products of hydrogen are singular, it is not convenient to use ion current for detection. However, hydrogen combustion emits a large amount of ultraviolet radiation, and the ultraviolet detector 44 can be used to effectively detect whether there is a hydrogen flame in the combustion chamber 200.

[0101] In some embodiments, such as Figure 9 As shown, the ultraviolet detector 44 is mounted and fixed to the outside of the burner housing 1. This helps to prevent the ultraviolet detector 44 from being exposed to high-temperature flames, thus extending the service life of the ultraviolet detector 44.

[0102] Specifically, a detection bracket 18 is provided on the outer wall of the burner housing 1, and an ultraviolet detector 44 is mounted on the detection bracket 18. For example, the detection bracket 18 is welded and fixed to the outer wall of the burner housing 1. If the detection bracket 18 is fixed to the outer wall of the burner housing 1 by brazing, it is beneficial to reduce the number of openings on the burner housing 1, reduce leakage points, and improve the structural strength of the burner housing 1.

[0103] For example, the detection bracket 18 is fixed to the back of the burner housing 1. It should be noted that, taking a gas water heater as an example, the side of the gas water heater with the control panel is the front side, the side of the gas water heater away from its control panel is the rear side, and the back of the burner housing 1 refers to the rear side wall of the burner housing 1.

[0104] In some embodiments, such as Figure 1 , Figure 9 and Figure 11 As shown, the burner housing 1 has a light-transmitting window 121 communicating with the combustion chamber 200. A quartz glass 41 is installed in the light-transmitting window 121, and the detection end of the ultraviolet detector 44 is located at the quartz glass 41, allowing light emitted from the flame inside the combustion chamber 200 to pass through the quartz glass 41 and enter the detection end of the ultraviolet detector 44. This enables the ultraviolet detector 44 to receive ultraviolet light to detect whether there is a flame inside the combustion chamber 200.

[0105] Specifically, the fully premixed combustion device also includes a first pressure plate 43 and a first sealing gasket 42. The first pressure plate 43 is installed on the burner housing 1, and the first sealing gasket 42 is sandwiched between the first pressure plate 43 and the outer wall of the burner housing 1. The first pressure plate 43 is provided with a first light-transmitting hole, and the inner wall of the first light-transmitting hole forms a first limiting surface. Quartz glass 41 is sandwiched between the first limiting surface and the first sealing gasket 42, and the first sealing gasket 42 is arranged around the outer periphery of the light-transmitting window 121. The light emitted by the flame in the combustion chamber 200 passes through the light-transmitting window 121, the central hole of the first sealing gasket 42, the quartz glass 41, and the first light-transmitting hole and enters the detection end of the ultraviolet detector 44.

[0106] In some embodiments, such as Figure 1 and Figure 10 As shown, the burner housing 1 has an observation window 122 communicating with the combustion chamber 200, and the observation window 122 is fitted with a light-transmitting glass 51 for observation. Exemplarily, the observation window 122 is located on the front side of the burner housing 1. It should be noted that the front side of the burner housing 1 refers to the front sidewall of the burner housing 1.

[0107] Specifically, the fully premixed combustion device also includes a second pressure plate 53 and a second sealing gasket 52. The second pressure plate 53 is installed on the burner housing 1, and the second sealing gasket 52 is sandwiched between the second pressure plate 53 and the outer wall of the burner housing 1. The second pressure plate 53 is provided with a second light-transmitting hole, and the inner wall of the second light-transmitting hole forms a second limiting surface. A light-transmitting glass 51 is sandwiched between the second limiting surface and the second sealing gasket 52, and the second sealing gasket 52 is arranged around the outer periphery of the observation window 122. The user can observe the combustion situation inside the combustion chamber 200 through the light-transmitting glass 51.

[0108] In some embodiments, such as Figures 1 to 3 As shown, a heat insulation plate 201 is provided on the circumferential inner wall of the combustion chamber 200. By providing the heat insulation plate 201, the heat transfer from the combustion flame to the burner housing 1 can be reduced, thereby reducing heat loss. Exemplarily, the heat insulation plate 201 is heat insulation cotton, and the heat insulation plate 201 has a ring structure, so that the entire inner wall of the combustion chamber 200 can be covered by the heat insulation plate 201.

[0109] Specifically, the burner housing 1 is connected to an annular heat insulation plate 202, which presses the heat insulation plate 201 against the circumferential edge of the fire hole plate 2 along its height direction. Exemplarily, the heat insulation plate 202 is fastened to the burner housing 1. It should be noted that the heat insulation plate 201 is provided with a first light-passing hole communicating with the light-transmitting window 121, a second light-passing hole communicating with the observation window 122, and a through hole for the ultraviolet detector 44.

[0110] Under a certain pressure and flow rate, the gas flows into the premixer 8. Simultaneously, the fan 9 starts operating, and outside air enters the premixer 8 through the fan 9. The gas and air undergo their first mixing in the premixer 8 to form a mixed gas. The mixed gas, after being mixed in the premixer 8, enters the mixing cavity through the air inlet 711 on the mixing shell 7. It then undergoes a second mixing of air and gas through the gaps inside the porous medium structure 6, achieving a more uniform mixing state. Then, the mixed gas enters the combustion chamber 200 through the flame holes 231 on the flame plate 2 and is ignited by the electric arc released by the ignition feedback needle 101. The flue gas generated by combustion is discharged through the opening at the end of the burner shell 1 away from the mixer.

[0111] At the same time, water enters the liquid cooling pipe 3 under the action of water pumps, etc. During the process of water flowing in the liquid cooling pipe 3, it absorbs heat energy and flows out to reduce the temperature of the fire orifice plate 2 and the root of the flame, reduce the flame propagation rate, and reduce the probability of backfire.

[0112] Meanwhile, the ultraviolet detector 44 receives the light emitted by the flame, effectively detecting its presence and ensuring normal combustion. Users can observe the combustion process inside the flame through the transparent glass 51.

[0113] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0114] The specific embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A fully premixed combustion device, characterized in that, include: The burner shell (1) has a hollow inner cavity that extends through its height. The orifice plate (2) divides the hollow inner cavity into a combustion chamber (200) and a mixing chamber (100) distributed along the height direction; the orifice plate (2) facing the combustion chamber (200) is provided with a plurality of receiving grooves (21) and a plurality of fire holes (23), and the plurality of receiving grooves (21) and the plurality of fire holes (23) are arranged alternately along the width direction of the burner shell (1); the fire hole (23) is provided with a plurality of fire holes (231), and the mixing chamber (100) is connected to the combustion chamber (200) through the fire holes (231), and the outlet center axis of the fire hole (231) is perpendicular to the plane where the opening of the receiving groove (21) is located; Multiple liquid cooling tubes (3) extend along the length of the burner housing (1). The liquid cooling tubes (3) are located in the combustion chamber (200) and correspond one-to-one with the receiving groove (21). The liquid cooling tubes (3) are at least partially located in the corresponding receiving groove (21). The outer side wall of the liquid cooling tubes (3) is at least partially in contact with the inner wall of the corresponding receiving groove (21).

2. The fully premixed combustion device according to claim 1, characterized in that, Along the height direction, the outer peripheral wall of the liquid cooling pipe (3) on the side away from the mixing chamber (100) includes a liquid cooling plane (31), which is perpendicular to the outlet center axis of the fire hole (231).

3. The fully premixed combustion device according to claim 2, characterized in that, The fire hole (23) is a flat plate structure perpendicular to the height direction, and the central axis of the fire hole (231) extends along the height direction.

4. The fully premixed combustion device according to claim 3, characterized in that, The surface of the fire hole (23) facing the combustion chamber (200) is a combustion plane (232); The liquid cooling plane (31) is flush with the combustion plane (232); or, along the height direction, the liquid cooling plane (31) is closer to the bottom wall of the accommodating tank (21) than the combustion plane (232).

5. The fully premixed combustion device according to claim 4, characterized in that, The receiving groove (21) causes the fire hole plate (2) to form a protrusion protruding from the fire hole (23) on the side facing the mixing chamber (100).

6. The fully premixed combustion device according to any one of claims 1 to 4, characterized in that, The burner housing (1) includes a burner frame (12) with the hollow inner cavity, a flow guide end cap (13), a liquid inlet end cap (14) and a liquid outlet end cap (15). The flow guide end cap (13) is located on one side of the burner frame (12) along the length direction and is sealed to the outer wall of the burner frame (12) to form a flow guide chamber (300). The liquid inlet cap (14) is located on the other side of the burner frame (12) along the length direction and is sealed to the outer wall of the burner frame (12) to form an inlet chamber (400); the liquid outlet cap (15) is located on the same side of the burner frame (12) along the length direction as the liquid inlet cap (14) and is sealed to the outer wall of the burner frame (12) to form an outlet chamber (500). The liquid inlet cap (14) is connected to an inlet pipe connector (16) that communicates with the inlet chamber (400), and the liquid outlet cap (15) is connected to an outlet pipe connector (17) that communicates with the outlet chamber (500).

7. The fully premixed combustion device according to claim 6, characterized in that, The liquid cooling pipe (3) and the fire hole plate (2) are welded and fixed together. And / or, the circumferential edge of the fire hole plate (2) is folded to form an annular mounting flange (22), which is sealed and welded to the inner wall of the hollow cavity; And / or, the flow guide end cap (13) is sealed and welded to the outer wall of the burner frame (12); And / or, the liquid inlet cap (14) is sealed and welded to the outer wall of the burner frame (12); And / or, the liquid outlet cap (15) is sealed and welded to the outer wall of the burner frame (12); And / or, the inlet pipe connector (16) is sealed and welded to the liquid inlet end cap (14). And / or, the outflow pipe joint (17) is sealed and welded to the liquid outlet cap (15). And / or, the liquid cooling pipe (3) is sealed and welded to the burner frame (12).

8. The fully premixed combustion device according to any one of claims 1 to 4, characterized in that, The fully premixed combustion device also includes an ultraviolet detector (44), which is installed and fixed outside the burner housing (1); the burner housing (1) has a light-transmitting window (121) communicating with the combustion chamber (200), and the light-transmitting window (121) is fitted with quartz glass (41), and the detection end of the ultraviolet detector (44) is located at the quartz glass (41).

9. The fully premixed combustion device according to any one of claims 1 to 4, characterized in that, The fully premixed combustion device also includes: The mixing housing (7) is sealed to the burner housing (1), and the mixing housing (7) blocks the opening of the mixing chamber (100) to form a mixing cavity; the mixing housing (7) is provided with an air inlet (711). A porous medium structure (6) is located in the mixing chamber (100). The porous medium structure (6) is opposite to and spaced apart from the air inlet (711) along the height direction. Along the flow path of the mixed gas, the air inlet (711), the flow channel in the porous medium structure (6) and the flame hole (231) are connected in sequence.

10. A gas-fired appliance, characterized in that, Includes the fully premixed combustion apparatus as described in any one of claims 1 to 9.

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