Fully premixed combustion device and gas equipment

Abstract

The utility model relates to gas equipment technical field discloses a kind of full premix combustion device and gas equipment. Due to the contact of fire hole plate and heat conduction structure surface, heat conduction structure is set in the outer liquid cooling pipe and with the contact of the outer circumferential wall surface of liquid cooling pipe, the heat energy of fire hole plate is conducted to the medium flowing in liquid cooling pipe by heat conduction structure, the temperature of fire hole plate can be effectively reduced, thereby reduce the probability of flame occurrence backfire problem. Since the heat conduction structure is set outside the liquid cooling pipe, the flame in the liquid cooling pipe and combustion chamber is separated by using the heat conduction structure, the liquid cooling pipe will not directly contact the flame, the degree of thermal corrosion of the liquid cooling pipe by the flame is greatly reduced, the temperature rising rate of the medium in the liquid cooling pipe can be slowed down, the medium in the liquid cooling pipe is beneficial to flow out before gasification, the internal pressure of the liquid cooling pipe is reduced, thereby prolonging the service life of the liquid cooling pipe.

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] The 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 surface of the flame plate, resulting in high combustion efficiency, fast combustion speed, and short flame. It can effectively reduce the generation of thermal nitrogen oxides, achieve full and efficient combustion of fuel gas, and reduce the emission of harmful gases.

[0003] To reduce pollutant emissions, related technologies propose using natural gas mixed with other clean gases or using clean gas combustion to meet emission requirements. During the operation of a fully premixed burner, the surface temperature around the combustion surface of the burner orifices is high, resulting in more concentrated thermal stress. Clean gas combustion is characterized by low ignition energy, easy ignition, and rapid combustion speed, making it easier for backfire to occur inside the burner. 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 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 extend the service life of liquid cooling pipes.

[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 first technical problem mentioned above is solved by the following technical solution:

[0008] The fully premixed combustion device includes:

[0009] The burner shell has a hollow inner cavity that extends along its height.

[0010] The fire-perforated plate divides the hollow inner cavity into a combustion chamber and a mixing chamber distributed along the height direction, and the heat-conducting structure is provided with multiple fire holes that penetrate along the height direction;

[0011] A heat-conducting structure is located inside the mixing chamber and in contact with the surface of the heat-conducting structure. The heat-conducting structure is provided with a first gas passage that extends along the height direction. Along the flow path of the mixed gas, the mixing chamber, the first gas passage, and the flame hole are sequentially connected.

[0012] The liquid cooling pipe is located at least partially within the mixing chamber, and the heat-conducting structure is sleeved around the liquid cooling pipe and in contact with the surface of the liquid cooling pipe.

[0013] The fully premixed combustion device described in this utility model has the following advantages compared with the prior art:

[0014] The fully premixed combustion device provided by this utility model has a heat-conducting structure located inside the mixing chamber. The heat energy around the heat-conducting structure inside the mixing chamber is transferred to the liquid cooling pipe through the heat-conducting structure, reducing the temperature of the mixed gas before combustion. After the mixed gas is cooled by the heat-conducting structure, it is sent to the flame orifice plate, which helps to slow down the flame propagation speed and reduce the probability of flame backfire. Moreover, the temperature of the area of ​​the mixing chamber near the flame orifice plate is lower, so that the area of ​​the heat-conducting structure near the flame orifice plate forms a low-temperature boundary region. The unburned mixed gas in this low-temperature boundary region can block the back propagation of the flame, further reducing the probability of flame backfire.

[0015] The mixed gas entering the mixing chamber sequentially passes through the first gas passage and the flame hole into the combustion chamber, where it is burned. Since the flame hole plate and the heat-conducting structure are in contact, and the heat-conducting structure is sleeved outside the liquid cooling pipe and in contact with the outer peripheral wall of the liquid cooling pipe, the heat energy of the flame hole plate is conducted to the medium flowing in the liquid cooling pipe through the heat-conducting structure, which can effectively reduce the temperature of the flame hole plate, thereby reducing the probability of flame backfire.

[0016] Because the heat-conducting structure is fitted outside the liquid cooling pipe, it separates the liquid cooling pipe from the flame in the combustion chamber, preventing the liquid cooling pipe from coming into contact with the flame. This significantly reduces the degree of thermal corrosion of the liquid cooling pipe by the flame, slows down the heating rate of the medium inside the liquid cooling pipe, and facilitates the flow of the medium out of the liquid cooling pipe before it vaporizes, thereby reducing the internal pressure of the liquid cooling pipe and extending its service life.

[0017] In one embodiment, the liquid cooling pipe includes a plurality of sub-pipes sequentially distributed along the width direction of the burner housing, and the heat-conducting structure includes a first heat-conducting part corresponding to each of the sub-pipes, wherein the sub-pipes pass through the corresponding first heat-conducting part along the length direction of the burner housing;

[0018] The first gas passage is formed by two adjacent first heat-conducting parts spaced apart along the width direction of the burner housing.

[0019] In one embodiment, at least two first gas passages are provided, and a gas transmission channel is formed between the first heat-conducting part and the fire orifice plate, with two adjacent first gas passages connected through the gas transmission channel.

[0020] In one embodiment, the fully premixed combustion device further includes a burner gasket, the burner gasket being made of a thermally conductive material; the burner gasket includes:

[0021] The first sealing gasket is sandwiched between the circumferential edge of the fire hole plate and the heat-conducting structure.

[0022] In one embodiment, the burner gasket further includes a second gasket portion connected to the first gasket portion, at least one of the first heat-conducting portions is provided with the second gasket portion, the second gasket portion is located in the area enclosed by the first gasket portion, and the second gasket portion is sandwiched between the corresponding first heat-conducting portion and the fire orifice plate.

[0023] In one embodiment, the heat-conducting structure further includes a second heat-conducting part, and two adjacent first heat-conducting parts are connected through the second heat-conducting part. The fire hole plate is provided with a mounting protrusion, and the mounting protrusion is connected to the second heat-conducting part in surface contact.

[0024] In one embodiment, the fully premixed combustion device includes a one-piece molded structural component, which includes the heat-conducting structure and the burner housing;

[0025] The integrally molded structural component is a cast aluminum structural component, and the liquid cooling pipe is a copper pipe.

[0026] In one embodiment, the fully premixed combustion device further includes:

[0027] 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;

[0028] A porous medium structure is located within the mixing cavity. 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, the first gas passage, and the flame hole are sequentially connected.

[0029] In one embodiment, a baffle is provided in the mixing cavity. The baffle is disposed between the air inlet and the porous medium structure along the height direction. The baffle is opposite to and spaced apart from both the air inlet and the porous medium structure along the height direction. The baffle is spaced apart from the circumferential sidewall of the mixing cavity.

[0030] The baffle's orthographic projection along the height direction in a plane perpendicular to the height direction covers the air inlet.

[0031] The second technical problem mentioned above is solved by the following technical solution:

[0032] Gas-fired equipment, including the fully premixed combustion device provided in any of the above embodiments.

[0033] Compared with the prior art, the gas equipment described in this utility model has the following beneficial effects:

[0034] 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

[0035] Figure 1 A schematic diagram showing the disassembled state of the fully premixed combustion device provided in this embodiment of the utility model;

[0036] Figure 2 A partial cross-sectional view of a burner housing with an integrated heat-conducting structure provided for an embodiment of this utility model;

[0037] Figure 3 A schematic diagram showing the disassembly of the burner housing with integrated heat-conducting structure and the liquid cooling pipe provided for an embodiment of this utility model;

[0038] Figure 4 A first cross-sectional view of the fully premixed combustion device provided in an embodiment of this utility model;

[0039] Figure 5 for Figure 4 A magnified view of a portion of point N in the diagram;

[0040] Figure 6 A schematic diagram of the structure of a burner housing with an integrated heat-conducting structure provided for an embodiment of this utility model;

[0041] Figure 7 A cross-sectional view of a burner housing with an integrated heat-conducting structure provided for an embodiment of this utility model;

[0042] Figure 8 A second cross-sectional view of the fully premixed combustion device provided in an embodiment of this utility model;

[0043] Figure 9 This is a schematic diagram of the structure of the fire-perforated plate provided in an embodiment of the present utility model;

[0044] Figure 10 A first-view structural schematic diagram of the fully premixed combustion device provided in an embodiment of this utility model;

[0045] Figure 11 for Figure 10 A magnified view of a portion of point A in the middle;

[0046] Figure 12 A schematic diagram of the structure of a baffle with an ear plate provided in an embodiment of this utility model;

[0047] Figure 13 for Figure 4 A magnified view of a portion of point M in the middle.

[0048] Label Explanation:

[0049] 11. Burner housing; 12. Heat-conducting structure; 121. First heat-conducting section; 1211. First heat-conducting sub-section; 1212. Second heat-conducting sub-section; 122. Second heat-conducting section; 123. First gas passage; 124. Gas transmission groove;

[0050] 2. Flame hole plate; 21. Flame hole; 22. Heat-conducting protrusion; 23. Mounting protrusion;

[0051] 3. Liquid cooling pipe; 31. Sub-pipe; 32. U-bend; 33. U-shaped bend; 34. Pipe joint;

[0052] 4. Porous media structure; 5. Mixing shell; 51. Inlet top wall; 511. Inlet;

[0053] 6. Burner gasket; 61. First gasket portion; 62. Second gasket portion; 63. Second gas passage;

[0054] 71. Baffle; 72. Ear plate;

[0055] 8. Premixer; 9. Fan;

[0056] 101. Ignition feedback needle; 102. Ignition seal;

[0057] 201. Insulation board; 202. Insulation pressure plate;

[0058] 301. Mixed seal; 302. Premixed seal; 303. Inlet seal;

[0059] 100. Mixing chamber; 200. Combustion chamber; 300. Gas transmission passage. Detailed Implementation

[0060] 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.

[0061] In the description of this utility model, it should be understood that the terms "center", "length direction", "width direction", "height direction", "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.

[0062] 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.

[0063] 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.

[0064] 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 equipment that uses gas as its fuel.

[0065] like Figures 1 to 6As shown, the fully premixed combustion device includes a burner housing 11, a heat-conducting structure 12, a liquid-cooled pipe 3, and a flame orifice plate 2. The burner housing 11 has a hollow inner cavity extending along its height. The flame orifice plate 2 divides the hollow inner cavity into a combustion chamber 200 and a mixing chamber 100 distributed along the height direction. The flame orifice plate 2 has multiple flame holes 21 extending along the height direction. The heat-conducting structure 12 is located within the mixing chamber 100 and is in contact with the flame orifice plate 2. The heat-conducting structure 12 has a first gas passage 123 extending along the height direction. Along the gas flow path, the mixing chamber 100, the first gas passage 123, and the flame holes 21 are sequentially connected. The liquid-cooled pipe 3 is at least partially located within the mixing chamber 100, and the heat-conducting structure 12 is sleeved around the liquid-cooled pipe 3 and in contact with the outer peripheral wall of the liquid-cooled pipe 3. For example, the medium flowing within the liquid-cooled pipe 3 is water.

[0066] Since the heat-conducting structure 12 is located inside the mixing chamber 100, the heat energy around the heat-conducting structure 12 inside the mixing chamber 100 is transferred to the liquid cooling pipe 3 through the heat-conducting structure 12, reducing the temperature of the mixed gas before combustion. After the mixed gas is cooled by the heat-conducting structure 12, it is sent to the flame orifice plate 2, which helps to slow down the flame propagation speed and reduce the probability of flame backfire. Moreover, it makes the temperature of the area of ​​the mixing chamber 100 near the flame orifice plate 2 lower, so that the area of ​​the heat-conducting structure 12 near the flame orifice plate 2 forms a low-temperature boundary region. The unburned mixed gas in this low-temperature boundary region can block the flame from propagating in the reverse direction, thereby further reducing the probability of flame backfire.

[0067] The mixed gas entering the mixing chamber 100 sequentially passes through the first gas passage 123 and the flame hole 21 into the combustion chamber 200, where it is burned. Since the flame hole plate 2 and the heat-conducting structure 12 are in contact, and the heat-conducting structure 12 is sleeved outside the liquid cooling pipe 3 and in contact with the outer peripheral wall of the liquid cooling pipe 3, the heat energy of the flame hole plate 2 is conducted to the medium flowing in the liquid cooling pipe 3 through the heat-conducting structure 12, thereby reducing the probability of flame backfire.

[0068] Since the heat-conducting structure 12 is sleeved outside the liquid cooling pipe 3, it separates the liquid cooling pipe 3 from the flame in the combustion chamber 200, so that the liquid cooling pipe 3 will not come into contact with the flame. The degree of thermal corrosion of the liquid cooling pipe 3 by the flame is greatly reduced, which can slow down the heating rate of the medium inside the liquid cooling pipe 3. This is conducive to the medium inside the liquid cooling pipe 3 flowing out of the liquid cooling pipe 3 before it vaporizes, reducing the internal pressure of the liquid cooling pipe 3, thereby extending the service life of the liquid cooling pipe 3.

[0069] In some embodiments, such as Figure 1As shown, the fully premixed combustion device includes a one-piece molded structural component, which includes a heat-conducting structure 12 and a burner housing 11. This arrangement integrates the heat-conducting structure 12 and the burner housing 11 into a single one-piece molded structural component, which helps to reduce the number of parts, lower costs, and also helps to prevent the liquid cooling pipe 3, which is located in the mixing chamber 100, from being exposed and directly contacting the flame.

[0070] For example, the integrally formed structural component is a cast aluminum structural component, which has good rigidity and thermal conductivity. As the heat energy on the fire orifice plate 2 and the heat energy in the mixing cavity 100 around the heat-conducting structure 12 are quickly and efficiently transferred to the liquid cooling pipe 3, the cooling effect on the fire orifice plate 2 and the temperature before combustion of the gas are improved; moreover, the forming method is simple and the cost is low.

[0071] For example, the liquid cooling pipe 3 is a copper pipe, which is safe and hygienic, has high corrosion resistance, long service life, and good thermal conductivity. This facilitates the rapid and efficient transfer of heat energy from the heat-conducting structure 12 to the liquid cooling pipe 3, where it is absorbed and carried away by the medium flowing inside the liquid cooling pipe 3.

[0072] In some embodiments, such as Figures 1 to 7 As shown, the liquid cooling pipe 3 includes a plurality of sub-pipes 31 distributed sequentially along the width direction of the burner housing 11. The heat-conducting structure 12 includes a first heat-conducting part 121 corresponding to each sub-pipe 31. The sub-pipe 31 passes through the corresponding first heat-conducting part 121 along the length direction of the burner housing 11. Two adjacent first heat-conducting parts 121 are spaced apart along the width direction of the burner housing 11 to form a first gas passage 123.

[0073] The sub-tube 31 extends through the corresponding first heat-conducting part 121 along the length of the burner shell 11, enabling the sub-tube 31 to be completely covered by the first heat-conducting part 121. This completely separates the sub-tube 31 from the flame, reducing the degree of thermal corrosion of the sub-tube 31 by the flame. By setting multiple sub-tubes 31, the heat exchange efficiency is improved. Two adjacent first heat-conducting parts 121 are spaced apart along the width of the burner shell 11 to form a first gas passage 123. This not only enables the mixed gas in the mixing chamber 100 to be sent to the flame orifice plate 2 through the first gas passage 123, but also increases the surface area of ​​the first heat-conducting part 121 that can contact the gas, thereby allowing more heat energy to radiate to the first heat-conducting part 121 and improving the effect of reducing flame temperature and flame propagation rate.

[0074] Each sub-tube 31 is installed into the integrally formed structural component using a pressure-embedding process. Specifically, each sub-tube 31 is placed into its corresponding through hole and then heated to ensure a tight fit between the outer peripheral wall of the sub-tube 31 and the inner peripheral wall of the through hole, ensuring stable surface contact between the two to guarantee efficient heat conduction. Alternatively, the sub-tubes 31 can be installed into the integrally formed structural component using a high-frequency brazing process.

[0075] In some embodiments, such as Figure 3 and Figure 7 As shown, the liquid cooling pipe 3 includes at least two U-shaped pipes distributed along the width direction. The openings of the different U-shaped pipes face the same direction, and the opening direction of the U-shaped pipes is parallel to the length direction. Two adjacent U-shaped pipes are connected by a U-shaped bend 32 to form a serpentine liquid cooling pipe 3. Each U-shaped pipe includes two sub-pipes 31 and a U-shaped bend 33 connecting the two sub-pipes 31. An integrally formed structural component is located between the U-shaped bend 33 and the U-shaped bend 32 along the length direction.

[0076] Using a U-shaped tube for the liquid cooling pipe 3 and connecting two adjacent U-shaped tubes through a U-shaped bend 32 helps to reduce the number of parts, improve integration, and reduce costs. The liquid cooling pipe 3 is easy to install and can be completely covered within the combustion chamber 200.

[0077] For example, the U-shaped elbow 32 and the U-shaped pipe are sealed together by welding, which is a simple and low-cost connection method.

[0078] For example, each end of the liquid cooling pipe 3 is connected to a pipe joint 34, and the pipe joint 34 and the cooling pipe are sealed together by welding. The connection method is simple and low cost.

[0079] As an alternative, the liquid cooling pipe 3 can also be composed of multiple sub-pipes 31 distributed sequentially along the width direction. Among three adjacent sub-pipes 31, one end of the middle sub-pipe 31 is connected to an adjacent sub-pipe 31 through a U-shaped bend 32, and the other end of the middle sub-pipe 31 is connected to another adjacent sub-pipe 31 through a U-shaped bend 32.

[0080] In some embodiments, such as Figure 5 As shown, at least two first gas passages 123 are provided, and a gas transmission passage 300 is formed between the first heat-conducting part 121 and the fire hole plate 2. Two adjacent first gas passages 123 are connected through the gas transmission passage 300.

[0081] This configuration facilitates the flow of the gas mixture between two adjacent first gas passages 123, promoting a uniform distribution of the gas mixture.

[0082] For example, the first heat-conducting part 121 is provided with a gas transmission groove 124 on the side facing the fire hole plate 2. The gas transmission groove 124 is provided through the second direction. The first heat-conducting part 121 covers the opening of the gas transmission groove 124 to form the gas transmission channel 300.

[0083] In some embodiments, the perforated plate 2 is made of stainless steel, such as 310 stainless steel, which has high temperature resistance, oxidation resistance and corrosion resistance. When hydrogen or a mixture of hydrogen and other gases is burned, the perforated plate 2 can maintain good stability in a high-temperature environment.

[0084] To improve the cooling effect of the heat-conducting structure 12 on the orifice plate 2, the orifice plate 2 and the heat-conducting structure 12 can be bonded together to improve heat transfer efficiency. However, when the fully premixed combustion device is working, because the orifice plate 2 and the heat-conducting structure 12 are in a high-temperature environment, they may undergo slight high-temperature deformation. This causes a small gap to appear at the bonding area between the orifice plate 2 and the heat-conducting structure 12, resulting in separation. Consequently, they cannot bond well, thus reducing the heat transfer effect between the heat-conducting structure 12 and the orifice plate 2.

[0085] To address the aforementioned technical problems, in some embodiments, such as Figure 1 as well as Figure 5 and Figure 8 As shown, the fully premixed combustion device also includes a burner gasket 6, which is made of a heat-conducting material. The burner gasket 6 includes a first sealing gasket portion 61, which is sandwiched between the circumferential edge of the fire orifice plate 2 and the heat-conducting structure 12. Exemplarily, the first sealing gasket portion 61 has an annular structure.

[0086] For example, the burner gasket 6 is made of graphite.

[0087] By providing the first sealing gasket 61, the combustion gas can be prevented 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 improving the combustion effect. Since the burner sealing gasket 6 is made of a heat-conducting material, it facilitates the conduction of heat energy from the circumferential edge of the orifice plate 2 to the heat-conducting structure 12 through the first sealing gasket 61, thereby improving the heat conduction effect. Furthermore, due to the sealing structure characteristics of the burner sealing gasket 6, it can undergo slight elastic deformation. Even if the orifice plate 2 and the heat-conducting structure 12 undergo high-temperature deformation under high-temperature conditions, the first sealing gasket 61 can still maintain surface contact with both the circumferential edge of the orifice plate 2 and the heat-conducting structure 12, ensuring that the heat energy from the circumferential edge of the orifice plate 2 can be stably conducted to the heat-conducting structure 12, thus guaranteeing the heat conduction effect between the heat-conducting structure 12 and the orifice plate 2.

[0088] In some embodiments, such as Figure 1 , Figure 5as well as Figure 8 and Figure 9 As shown, at least one first heat-conducting part 121 is provided with a second sealing gasket part 62, the second sealing gasket part 62 is located in the area enclosed by the first sealing gasket part 61, and the second sealing gasket part 62 is sandwiched between the corresponding first heat-conducting part 121 and the fire hole plate 2.

[0089] By providing a second sealing gasket 62 between the first heat-conducting part 121 and the orifice plate 2, the heat energy of the orifice plate 2 can be conducted to the first heat-conducting part 121 through the second sealing gasket 62, thereby improving the heat conduction effect. Due to the structural characteristics of the burner sealing gasket 6, even if the orifice plate 2 and the first heat-conducting part 121 undergo high-temperature deformation under high-temperature conditions, the second sealing gasket 62 can still maintain surface contact with both the orifice plate 2 and the first heat-conducting part 121, so as to ensure that the heat energy on the orifice plate 2 can be stably conducted to the first heat-conducting part 121, and to ensure the heat conduction effect between the first heat-conducting part 121 and the orifice plate 2.

[0090] Specifically, the fire plate 2 has a heat-conducting protrusion 22 on the side facing the first heat-conducting part 121, and the second sealing gasket part 62 is sandwiched between the corresponding first heat-conducting part 121 and the heat-conducting protrusion 22.

[0091] For example, forming the above-mentioned heat-conducting protrusion 22 by stamping the fire hole plate 2 is beneficial to improving the structural strength of the fire hole plate 2.

[0092] Specifically, the perforated plate 2 has a recess on the side facing the heat-conducting structure 12. A heat-conducting protrusion 22 protrudes from the bottom wall of the recess and extends along a third direction. The heat-conducting protrusion 22 is spaced apart from the circumferential sidewall of the recess at either end in the third direction, and spaced apart from the adjacent heat-conducting protrusion 22 at either end in the second direction. Each heat-conducting protrusion 22 includes at least two heat-conducting sub-protrusions spaced apart along its length. A flame hole 21 is located on the bottom wall of the recess and penetrates the bottom wall of the recess along a first direction. Flame holes 21 are provided between adjacent heat-conducting protrusions 22, between adjacent heat-conducting sub-protrusions of the same heat-conducting protrusion 22, between the heat-conducting protrusion 22 at either end in the third direction and the circumferential sidewall of the recess, and between the circumferential sidewall of the recess at either end in the second direction and the adjacent heat-conducting protrusion 22, allowing the gas to circulate throughout the entire recess and improving gas uniformity.

[0093] For example, the above-mentioned recess and heat-conducting protrusion 22 are formed by stamping to improve the structural strength of the fire hole plate 2.

[0094] As an alternative, when the fire hole plate 2 and the heat-conducting structure 12 are made of the same metal material, the fire hole plate 2 and the heat-conducting structure 12 can be brazed and fixed so that the fire hole plate 2 and the heat-conducting structure 12 can remain in contact, thus solving the problem of separation of the contact parts of the fire hole plate 2 and the heat-conducting structure 12 caused by high temperature deformation.

[0095] In some embodiments, such as Figure 1 , Figure 5 as well as Figure 8 and Figure 9 As shown, the second sealing gasket portion 62 is integrally formed on the first sealing gasket portion 61 to form the burner sealing gasket 6. In other words, the burner sealing gasket 6 is an integrally formed structure, which helps to reduce the number of parts and simplify assembly. For example, the burner sealing gasket 6 is a graphite sealing gasket, which has good sealing performance and strong thermal conductivity.

[0096] Specifically, the plurality of first heat-conducting parts 121 include two first heat-conducting sub-parts 1211 spaced apart along the width direction, and a second heat-conducting sub-part 1212 located between the two first heat-conducting sub-parts 1211. For example, there are two second heat-conducting sub-parts 1212, and the second sealing gasket part 62 and the second heat-conducting sub-part 1212 are arranged in a one-to-one correspondence. A second gas passage 63 is formed between two adjacent second sealing gasket parts 62 and between the second sealing gasket part 62 and the first sealing gasket part 61. The mixed gas in the mixing chamber 100 enters the combustion chamber 200 sequentially through the second gas passage 63 and the flame hole 21 on the flame hole plate 2.

[0097] In some embodiments, such as Figure 1 , Figures 4 to 6 as well as Figure 9 As shown, the heat-conducting structure 12 also includes a second heat-conducting part 122. Two adjacent first heat-conducting parts 121 are connected through the second heat-conducting part 122. The orifice plate 2 is provided with a mounting protrusion 23, which is connected to the second heat-conducting part 122 in surface contact. Exemplarily, the mounting protrusion 23 is connected to the second heat-conducting part 122 by fasteners, and one end of the second heat-conducting part 122 passes through the second gas passage 63 and abuts against the corresponding mounting protrusion 23. This arrangement improves the stability of the heat-conducting structure 12 and the stability between the orifice plate 2 and the second heat-conducting part 122, facilitating the transfer of heat energy from the orifice plate 2 to the second heat-conducting part 122, and then from the second heat-conducting part 122 to the connected first heat-conducting parts 121, thus improving heat transfer efficiency.

[0098] In some embodiments, the first heat-conducting part 121 protrudes from the second heat-conducting part 122 along the height direction toward the side where the mixing chamber 100 is located, so that the first heat-conducting part 121 can absorb more heat energy.

[0099] In some embodiments, the second heat-conducting part 122 protrudes from the first heat-conducting part 121 along the height direction toward the side where the combustion chamber 200 is located, so as to arrange the burner sealing gasket 6 by utilizing the height difference between the first heat-conducting part 121 and the second heat-conducting part 122.

[0100] Specifically, the surface of the heat-conducting protrusion 22 facing the second sealing gasket 62, the surface of the mounting protrusion 23 facing the second heat-conducting part 122, and the surface of the circumferential edge of the heat-conducting structure 12 facing the first sealing gasket 61 are flush, i.e., located on the same plane. This arrangement allows the burner gasket 6 to directly adopt a flat plate structure with a second gas passage 63, simplifying the structure of the burner gasket 6 and reducing costs.

[0101] In some embodiments, such as Figure 4 and Figure 5 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 11 can be reduced, thereby reducing heat loss. For example, 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.

[0102] Specifically, the burner housing 11 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 the height direction. Exemplarily, the heat insulation plate 202 is fastened to the burner housing 11.

[0103] In some embodiments, such as Figure 4 , Figure 5 , Figures 10 to 13 As shown, the fully premixed combustion device also includes a mixing shell 5, a premixer 8, and a porous media structure 4. The mixing shell 5 is sealed to the burner shell 11. The mixing shell 5 blocks the opening of the premixer 8 to form a mixing cavity. An air inlet 511 is provided on the air inlet top wall 51 of the mixing shell 5. The porous media structure 4 is located in the mixing cavity. The porous media structure 4 is opposite to and spaced apart from the air inlet 511 along the height direction. Along the flow path of the mixed gas, the air inlet 511, the flow channel in the porous media structure 4, the first gas passage 123, and the flame hole 21 are sequentially connected.

[0104] The mixed gas enters the mixing cavity through the air inlet 511. Because the porous media structure 4 is positioned opposite and spaced apart from the air inlet 511 along its height, it ensures that the airflow is evenly distributed throughout the various areas of the porous media structure 4 after entering the mixing cavity. Furthermore, the irregularly interconnected network channels formed by the internal pores of the porous media structure 4 allow 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 uniform pressure distribution, and a consistent flow rate at each flame hole 21 on the flame plate 2. This improves the uniformity of the surface heat intensity of the flame plate 2 and enhances combustion stability.

[0105] The porous medium structure 4 also has a certain heat capacity. The larger the heat capacity, the stronger the ability of the porous medium structure 4 to absorb and store heat energy. Combined with the porosity and pore size distribution characteristics of the porous medium structure 4, 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 21, the porous medium structure 4 is used for heat insulation to prevent the flame from continuing to spread backfire.

[0106] An air inlet 511 is provided on the air inlet top wall 51 of the mixing housing 5. For example, the air inlet 511 is located at the center of the air inlet top wall 51, which facilitates the airflow entering the mixing cavity through the air inlet 511 to flow in all directions, so that the airflow enters each area of ​​the porous medium structure 4 more evenly.

[0107] In some embodiments, such as Figure 13 As shown, the mixing housing 5 has an opening at one end facing the burner housing 11. The circumferential edge of the opening end of the mixing housing 5 is folded outward to form an annular flange. The annular flange and the burner housing 11 are connected by fasteners, and a mixing seal 301 is provided between the annular flange and the burner housing 11. By providing the mixing seal 301, leakage of the mixed gas in the mixing cavity through the gap between the annular flange and the burner housing 11 can be prevented.

[0108] In some embodiments, such as Figure 13 As shown, the porous medium structure 4 is sandwiched between the end face of the mixing shell 5 with the opening and the heat-conducting structure 12 along the height direction, so that the porous medium structure 4 is spaced apart from the air inlet 511 along the height direction.

[0109] As an alternative, a limiting protrusion can be provided on the inner wall of the mixing shell 5, and the porous medium structure 4 can be sandwiched between the limiting protrusion and the heat-conducting structure 12 along the height direction, so that the porous medium structure 4 is spaced apart from the air inlet 511 along the height direction.

[0110] In some embodiments, such as Figure 12 and Figure 13As shown, a baffle 71 is provided in the mixing cavity. The baffle 71 is located between the air inlet 511 and the porous medium structure 4 along the height direction. The baffle 71 is opposite to and spaced apart from both the air inlet 511 and the porous medium structure 4 along the height direction. The baffle 71 and the circumferential sidewall of the mixing cavity are spaced apart. The orthographic projection of the baffle 71 in the plane perpendicular to the height direction covers the air inlet 511.

[0111] The baffle 71 is used to guide the airflow in the air intake mixing cavity, so that the airflow flows evenly around the baffle 71, avoiding the airflow blowing directly onto the porous medium structure 4, and ensuring the uniformity of airflow in the space between the porous medium structure 4 and the air intake 511.

[0112] For example, the center of the baffle 71 extending along the height direction is coaxially arranged with the air inlet 511, and the orthographic projection of the baffle 71 in the plane perpendicular to the height direction completely covers the air inlet 511.

[0113] Specifically, the baffle 71 is connected to at least two ear plates 72 spaced apart along its circumference, and the ear plates 72 are connected to the mixing housing 5. Exemplarily, four ear plates 72 are provided, and the ear plates 72 are connected to the air intake top wall 51 by fasteners, making installation convenient and quick. It should be noted that the number of ear plates 72 is not limited to four; it can also be two, three, or more.

[0114] In some embodiments, such as Figure 1 and Figure 8 As shown, the fully premixed combustion device also includes a premixer 8, which is installed at the end of the mixing housing 5 away from the burner housing 11. The mixing outlet and the air inlet 511 of the premixer 8 are connected. A premixing seal 302 is provided between the premixer 8 and the mixing housing 5. The premixing seal 302 surrounds the outer periphery of the mixing outlet and the outer periphery of the air inlet 511 to prevent the mixed gas from leaking through the gap between the premixer 8 and the mixing housing 5. The premixer 8 is used to mix the gas and air to form a uniform combustible mixture, ensuring a more complete and stable combustion process, achieving efficient combustion and energy-saving effects.

[0115] 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.

[0116] In some embodiments, such as Figure 1 and Figure 10 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 11 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 5, 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.

[0117] An ignition seal 102 is provided between the ignition feedback needle 101 and the outer wall of the burner housing 11 to prevent the gas from leaking out through the gap between the ignition feedback needle 101 and the burner housing 11.

[0118] 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 a first mixing process 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 511 on the mixing shell 5. Under the obstruction and diversion effect of the baffle 71, it flows evenly into the porous medium structure 4. Through the gaps inside the porous medium structure 4, the air and gas undergo a second mixing process, achieving a more uniform mixing state. Then, the mixed gas enters the combustion chamber 200 through the flame holes 21 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 11 away from the mixer.

[0119] 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.

[0120] It should be noted that the flame orifice plate 2 is roughly a plate-shaped structure. The thickness of the plate-shaped structure can be designed according to the power, so that the flame holes 21 on the flame orifice plate 2 have a certain depth, in order to further refine the flame temperature of each flame hole 21, thereby further reducing the probability of backfire and further reducing nitrogen oxide emissions.

[0121] 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.

[0122] 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 housing (11) has a hollow inner cavity that extends through its height. The fire hole plate (2) divides the hollow inner cavity into a combustion chamber (200) and a mixing chamber (100) distributed along the height direction. The fire hole plate (2) is provided with a plurality of fire holes (21) that penetrate along the height direction. A heat-conducting structure (12) is located inside the mixing chamber (100) and in contact with the surface of the flame plate (2). The heat-conducting structure (12) is provided with a first gas passage (123) that runs through the height direction. Along the flow path of the mixed gas, the mixing chamber (100), the first gas passage (123) and the flame (21) are connected in sequence. The liquid cooling pipe (3) is located at least partially inside the mixing chamber (100), and the heat-conducting structure (12) is sleeved outside the liquid cooling pipe (3) and in contact with the outer peripheral wall of the liquid cooling pipe (3).

2. The fully premixed combustion device according to claim 1, characterized in that, The liquid cooling pipe (3) includes a plurality of sub-pipes (31) arranged sequentially along the width direction of the burner housing (11), and the heat-conducting structure (12) includes a first heat-conducting part (121) corresponding to each of the sub-pipes (31). The sub-pipes (31) penetrate the corresponding first heat-conducting part (121) along the length direction of the burner housing (11). The first gas passage (123) is formed by two adjacent first heat-conducting parts (121) spaced apart along the width direction of the burner housing (11).

3. The fully premixed combustion device according to claim 2, characterized in that, The first gas passage (123) is provided with at least two, and a gas transmission passage (300) is formed between the first heat-conducting part (121) and the fire hole plate (2), and two adjacent first gas passages (123) are connected through the gas transmission passage (300).

4. The fully premixed combustion device according to claim 3, characterized in that, The fully premixed combustion device also includes a burner gasket (6), which is made of a thermally conductive material; the burner gasket (6) includes: The first sealing gasket (61) is sandwiched between the circumferential edge of the fire hole plate (2) and the heat-conducting structure (12).

5. The fully premixed combustion device according to claim 4, characterized in that, The burner gasket (6) further includes a second gasket (62) connected to the first gasket (61), at least one of the first heat-conducting parts (121) is provided with the second gasket (62), the second gasket (62) is located in the area enclosed by the first gasket (61), and the second gasket (62) is sandwiched between the corresponding first heat-conducting part (121) and the fire hole plate (2).

6. The fully premixed combustion device according to claim 2, characterized in that, The heat-conducting structure (12) further includes a second heat-conducting part (122), and two adjacent first heat-conducting parts (121) are connected through the second heat-conducting part (122). The fire hole plate (2) is provided with a mounting protrusion (23), and the mounting protrusion (23) is connected to the second heat-conducting part (122) in surface contact.

7. The fully premixed combustion device according to any one of claims 1 to 6, characterized in that, The fully premixed combustion device includes an integrally molded structural component, which includes the heat-conducting structure (12) and the burner shell (11). The integrally formed structural component is an aluminum casting structural component, and the liquid cooling pipe (3) is a copper pipe.

8. The fully premixed combustion device according to any one of claims 1 to 6, characterized in that, The fully premixed combustion device also includes: The mixing housing (5) is sealed to the burner housing (11), and the mixing housing (5) blocks the opening of the mixing chamber (100) to form a mixing cavity; the mixing housing (5) has an air inlet (511) on the air inlet top wall (51). A porous medium structure (4) is located in the mixing cavity. The porous medium structure (4) is opposite to and spaced apart from the air inlet (511) along the height direction. Along the flow path of the mixed gas, the air inlet (511), the flow channel in the porous medium structure (4), the first gas passage (123) and the flame hole (21) are connected in sequence.

9. The fully premixed combustion device according to claim 8, characterized in that, A baffle (71) is provided inside the mixing cavity. The baffle (71) is disposed between the air inlet (511) and the porous medium structure (4) along the height direction. The baffle (71) is opposite to and spaced apart from the air inlet (511) and the porous medium structure (4) along the height direction. The baffle (71) is spaced apart from the circumferential sidewall of the mixing cavity. The baffle (71) covers the air inlet (511) in the orthographic projection of the plane perpendicular to the height direction.

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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