Combustor and water heater

Abstract

The application discloses a burner and a water heater, wherein the burner comprises a shell formed with a combustion chamber, the shell has a first side wall and a second side wall, the first side wall and the second side wall are oppositely arranged, a plurality of first nozzles are arranged on the first side wall, and a plurality of second nozzles are arranged on the second side wall, and the axis of the first nozzle and the axis of the second nozzle are arranged staggeredly. The application arranges a plurality of first nozzles and a plurality of second nozzles on the first side wall and the second side wall of the combustion chamber respectively, so that the plurality of nozzles can spray the gas for combustion from two sides respectively, the flame formed in the combustion chamber can be relatively dispersed, and the problem that the inner wall of the combustion chamber is overheated due to excessive air pressure when the airflow is concentrated and sprayed out is reduced; the first nozzle and the second nozzle are arranged staggeredly, the mutual collision of the airflow of the first nozzle and the second nozzle is reduced, and the combustion efficiency of the gas is improved.

Description

Technical Field

[0001] This invention relates to the field of water heaters, and particularly to a burner and a water heater. Background Technology

[0002] High-temperature air combustion, also known as mild and deep oxygen dilution combustion (MILD), is a novel combustion method. When the fuel gas and air mixture is injected into the combustion chamber at high speed, incomplete combustion can easily occur due to the high velocity of the gas mixture. Furthermore, the high temperature of the combustion gases can cause overheating of the inner walls of the combustion chamber, affecting the burner's lifespan. Summary of the Invention

[0003] The main objective of this invention is to provide a burner and water heater that aims to improve the problem of high side wall temperatures caused by airflow impacting the inner wall of the burner in existing burners.

[0004] To achieve the above objectives, the present invention provides a burner for a water heater, the burner comprising:

[0005] The housing has a combustion chamber, and the housing has a first sidewall and a second sidewall, which are disposed opposite to each other.

[0006] Multiple first nozzles are disposed on the first sidewall; and

[0007] Multiple second nozzles are disposed on the second sidewall, with the axes of the first nozzle and the second nozzles being offset from each other.

[0008] Optionally, the orthographic projection of the first nozzle onto the second sidewall is located at the midpoint between two adjacent second nozzles.

[0009] Optionally, the first nozzle and the second nozzle are arranged parallel to each other.

[0010] Optionally, the number of the first nozzles is not less than 12 and not more than 24, the distance between adjacent first nozzles is not less than 10 mm and not more than 40 mm, and the inner diameter of the first nozzle is not less than 3.6 mm and not more than 7 mm.

[0011] The number of the second nozzles shall be no less than 12 and no more than 24, the distance between adjacent second nozzles shall be no less than 10 mm and no more than 40 mm, and the inner diameter of the second nozzles shall be no less than 3.6 mm and no more than 7 mm.

[0012] Optionally, the number of the first nozzles is 10, the spacing between adjacent first nozzles is 18 mm, and the inner diameter of the first nozzle is 4 mm; and / or

[0013] The number of the second nozzles is 10, the spacing between adjacent second nozzles is 18mm, and the inner diameter of the second nozzle is 4mm.

[0014] Optionally, the burner further includes:

[0015] An air intake shroud, wherein the air intake shroud forms an air intake chamber and an air intake pipe communicating with the air intake chamber;

[0016] The air intake shroud is located on the side of the first sidewall facing away from the combustion chamber, and the end of the first nozzle away from the combustion chamber is connected to the air intake cavity; and / or

[0017] The air intake shroud is located on the side of the second sidewall facing away from the combustion chamber, and the end of the second nozzle away from the combustion chamber is connected to the air intake pipe.

[0018] Optionally, the air intake chamber is provided with a baffle plate, which divides the air intake chamber into a first chamber close to the air intake pipe and a second chamber away from the air intake pipe. The baffle plate is provided with a flow hole connecting the first chamber and the second chamber.

[0019] When the air intake shroud is located on the side of the first sidewall facing away from the combustion chamber, the first nozzle is connected to the second chamber; when the air intake shroud is located on the side of the second sidewall facing away from the combustion chamber, the second nozzle is connected to the second chamber.

[0020] Optionally, the airflow channel formed by the intake pipe is parallel to the length direction of the spoiler, and the effective flow area of ​​the flow hole at the end closer to the intake pipe is greater than the effective flow area of ​​the flow hole at the end farther from the intake pipe.

[0021] Optionally, the effective flow area of ​​the first chamber gradually increases from the direction of the air intake pipe toward the spoiler.

[0022] Optionally, the spoiler has a wavy structure along its length, and the flow holes are located on the rising and / or falling surfaces of the wavy structure.

[0023] Optionally, the air intake shroud includes:

[0024] Back cover;

[0025] A front cover, disposed opposite to the rear cover, wherein the front cover has a through hole; and

[0026] A side panel is disposed between the rear cover and the front cover. The front cover, the rear cover, and the side panel together form the air intake chamber. The air intake pipe is connected to the side panel or the rear cover. When the air intake hood is disposed on the side of the first side wall facing away from the combustion chamber, the first nozzle is connected to the air intake chamber through the through hole. When the air intake hood is disposed on the side of the second side wall facing away from the combustion chamber, the second nozzle is connected to the air intake chamber through the through hole.

[0027] Optionally, the burner further includes a heat-conducting pipe disposed near the first sidewall and / or the second sidewall.

[0028] Optionally, the heat pipe is disposed on the side of the first sidewall and / or the second sidewall facing the combustion chamber.

[0029] Optionally, the housing further includes:

[0030] A third sidewall, wherein a first protrusion is provided on the third sidewall; and

[0031] The fourth sidewall is disposed opposite to the third sidewall. The first sidewall, the third sidewall, the second sidewall and the fourth sidewall enclose the combustion chamber. The fourth sidewall is provided with a second convex bulge. Hollow cavities are formed in the first convex bulge and the second convex bulge. The heat-conducting pipe is connected to the first convex bulge and the second convex bulge respectively.

[0032] Optionally, the burner further includes:

[0033] A preheater is used to preheat the gas to a target temperature before delivering it to the combustion chamber;

[0034] Specifically, combustion gas and / or air are injected into the combustion chamber through the first nozzle and the second nozzle, causing a high-temperature air combustion reaction to occur in the combustion chamber.

[0035] Based on the burner described above, this invention proposes a water heater, which includes the burner as described above.

[0036] The technical solution of this invention provides a plurality of first nozzles and a plurality of second nozzles respectively on the first and second sidewalls of the combustion chamber. The multiple nozzles disperse the gas into the combustion chamber from both sides, thereby reducing the problem of excessive local gas pressure when the gas is concentrated and causing overheating of the inner wall of the combustion chamber. By staggering the first and second nozzles, the mutual collision of the gas flow between the first and second nozzles is reduced, thereby improving the combustion efficiency of the gas. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of the structure of an embodiment of the burner of the present invention;

[0039] Figure 2 Simulated velocity contour plot of the first nozzle exit section;

[0040] Figure 3 This is a magnified view of the simulated velocity of the first nozzle cross-section.

[0041] Figure 4 for Figure 1 Exploded view;

[0042] Figure 5 This is a schematic diagram of the structure of an embodiment of the spoiler of the present invention.

[0043] Explanation of icon numbers:

[0044] label name label name 10 Combustion chamber 11 air intake hood 12 intake manifold 13 Back cover 14 Front cover 15 Side panels 16 spoilers 17 Flow hole 20 First side wall 21 First nozzle 22 First side panel 23 First air intake pipe 24 First back cover 25 First spoiler 26 First front cover 27 Slot 30 Second side wall 31 Second nozzle 32 Second side panel 33 Second air intake pipe 34 Second back cover 35 Second spoiler 36 Second front cover 40 heat pipe 50 Third side wall 51 First convex hull 60 Fourth sidewall 61 Second convex hull

[0045] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0046] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0047] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0048] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0049] Please see Figure 1 This invention proposes a burner for water heaters, particularly suitable for gas water heaters that use high-temperature air combustion and other related products and equipment that use gas combustion to generate high-temperature hot water for home bathing and heating. For ease of understanding, the following example is applied to water heaters.

[0050] In one embodiment, the burner includes: a housing having a combustion chamber 10, the housing having a first sidewall 20 and a second sidewall 30, the first sidewall 20 and the second sidewall 30 being disposed opposite to each other; a plurality of first nozzles 21 disposed on the first sidewall 20; and a plurality of second nozzles 31 disposed on the second sidewall 30, the axes of the first nozzles 21 and the axes of the second nozzles 31 being offset from each other.

[0051] The housing has a hollow chamber inside, which is the combustion chamber 10. The first sidewall 20 and the second sidewall 30 are two opposing sidewalls of the housing. The first nozzles 21 are spaced apart on the first sidewall 20 and connect to the inner and outer sides of the combustion chamber 10, used to inject gas from outside the combustion chamber 10 into the combustion chamber 10. The second nozzles 31 are spaced apart on the second sidewall 30 and connect to the inner and outer sides of the combustion chamber 10, used to inject gas from outside the combustion chamber 10 into the combustion chamber 10.

[0052] The combustion chamber 10 is used to create a space for gas combustion. The first nozzle 21 and the second nozzle 31 inject gas at high speed into the combustion chamber 10. This gas can be natural gas or a mixture of natural gas and air injected into the first nozzle 21 and the second nozzle 31, with air present in the combustion chamber 10 for combustion of the natural gas. Alternatively, the combustion chamber 10 may contain natural gas, with air or a mixture of air and natural gas injected into the combustion chamber 10 by the first nozzle 21 and the second nozzle 31. The burner is used in a water heater. The high-temperature flue gas generated by combustion in the combustion chamber 10 exchanges heat with the heat exchange tubes of the water heater to heat the water in the heat pipe 40, forming hot water which is then output.

[0053] Since the first sidewall 20 and the second sidewall 30 are arranged opposite to each other, the airflows generated by the first nozzle 21 and the second nozzle 31 may interfere with each other. In this embodiment, the axial direction of the first nozzle 21 is offset from the axial direction of the second nozzle 31 so that the airflow generated by the first nozzle 21 and the airflow generated by the second nozzle 31 do not directly collide, thereby avoiding the problem of incomplete combustion caused by the airflows colliding with each other.

[0054] When the gas ejected by the first nozzle 21 and the second nozzle 31 forms a flame, the gas flow from the first nozzle 21 and the second nozzle 31 can burn rapidly within the combustion chamber 10, quickly creating a high-temperature state within the combustion chamber 10 and accelerating the combustion speed. When the gas flow enters the combustion chamber 10, it is burned rapidly, and the force exerted by the gas flow on the first sidewall 20 and the second sidewall 30 is relatively small, thereby reducing the problem of gas flow impacting the chamber.

[0055] Because the airflows ejected by the first nozzle 21 and the second nozzle 31 are staggered, with the first nozzle 21 ejecting airflow towards the second sidewall 30 and the second nozzle 31 ejecting airflow towards the first sidewall 20, the combustion efficiency of the combustible gas near the outer flame is relatively higher. Therefore, the combustion efficiency of the combustible gas near the nozzle is lower than that of the combustible gas farther from the nozzle. In this embodiment, the heat of the outer flame of the flame formed by the airflow ejected by the first nozzle 21 can act on the second sidewall 30, enabling the combustible gas near the second sidewall 30 in the airflow ejected by the second nozzle 31 to be burned. The combustible gas near the second nozzle 31 is fully burned, improving the uniformity of combustible gas combustion and helping to improve the temperature uniformity within the combustion chamber 10, thereby delivering uniformly heated gas to the water heater.

[0056] In this embodiment, a rectangular combustion chamber 10 is formed inside the burner, and the housing also includes a third side wall 50 and a fourth side wall 60. The fourth side wall 60 is disposed opposite to the third side wall 50, and the first side wall 20, the third side wall 50, the second side wall 30 and the fourth side wall 60 enclose the combustion chamber 10.

[0057] Optionally in this embodiment, the orthographic projection of the first nozzle 21 onto the second sidewall 30 is located in the middle of two adjacent second nozzles 31, so that the airflow generated by the first nozzle 21 and the second nozzle 31 does not form turbulence, and the combustion of the combustible gas is more complete.

[0058] The first nozzle 21 and the second nozzle 31 spray gas towards each other, with multiple first nozzles 21 dispersively injecting airflow into the combustion chamber 10. This ensures that the airflow entering the combustion chamber 10 is slower than the airflow from a single nozzle, thereby reducing the impact of the airflow from the first nozzle 21 on the second sidewall 30 and preventing localized overheating caused by overly concentrated flame combustion in the second nozzle 31. The first nozzle 21 and the second nozzle 31 can be staggered so that the airflows injected by the first nozzle 21 and the second nozzle 31 interweave.

[0059] Optionally in this embodiment, the first nozzle 21 and the second nozzle 31 are arranged parallel to each other so that the airflows ejected by the first nozzle 21 and the second nozzle 31 move towards each other. Since the first nozzle 21 and the second nozzle 31 are staggered, the airflows can be staggered. When a flame is formed, the flames formed by the first nozzle 21 and the second nozzle 31 do not interfere with each other, which can improve the combustion efficiency of combustible gas.

[0060] When the airflow injected by the first nozzle 21 and the airflow injected by the second nozzle 31 are burned in the combustion chamber 10, the airflow can fully interact with the air or combustible gas in the combustion chamber 10, so as to make the combustion efficiency of the combustible gas higher.

[0061] Because the first nozzle 21 and the second nozzle 31 can evenly disperse and input gas into the combustion chamber 10, the mixing of combustible gas and air within the combustion chamber 10 is more thorough, thereby improving combustion efficiency and reducing nitrogen oxides and carbon monoxide produced by the combustible gas. When the total amount of gas input is equal, the multiple first nozzles and multiple second nozzles disperse and inject airflow into the combustion chamber, compared to the method of a single nozzle, reduces the impact force of a single nozzle on the inner wall of the combustion chamber, thereby reducing damage to the burner components.

[0062] In one embodiment of the present invention, the burner further includes a preheater, which is used to preheat the gas to a target temperature before delivering it to the combustion chamber 10; wherein, gas and / or air are injected into the combustion chamber 10 through the first nozzle 21 and the second nozzle 31, so that a high-temperature air combustion reaction takes place in the combustion chamber 10.

[0063] High-temperature air combustion, also known as mild and deep oxygen dilution combustion (MILD), is a novel combustion method. Its main characteristics are: the chemical reaction primarily occurs in a high-temperature, low-oxygen environment (temperatures mainly between 600-1200 degrees Celsius, oxygen concentration of 3%–10%); the reactant temperature is higher than its auto-ignition temperature, and the maximum temperature rise during combustion is lower than its auto-ignition temperature; the oxygen volume fraction is diluted to an extremely low concentration by the combustion products, typically 3%–10%. Compared to conventional combustion, fuel pyrolysis is suppressed under this combustion condition, the flame thickness increases, and the flame front disappears, resulting in a highly uniform temperature throughout the furnace and a significant reduction in NOx and CO emissions.

[0064] The preheater or the first nozzle 21 and the second nozzle 31 input combustible gas into the combustion chamber 10. Taking the preheater injecting air into the combustion chamber 10 and the first nozzle 21 and the second nozzle 31 injecting a mixture of gas and air into the combustion chamber 10 as an example, when the first nozzle 21 and the second nozzle 31 inject the gas flow into the combustion chamber 10 at high speed, the high-speed incident gas flow exchanges heat with the preset gas in the combustion chamber 10, achieving rapid combustion. Under the action of the first nozzle 21 and the second nozzle 31, when the gas flow injected by the first nozzle 21 and the second nozzle 31 rapidly enters the combustion chamber 10, it will form a entrapment effect with the gas flow delivered to the combustion chamber 10 by the preheater. The high-speed gas flow injected into the combustion chamber 10 can impact the preheated gas flow in the combustion chamber 10, causing the gas flow to be rapidly disturbed. The preheated gas flow can quickly mix and burn with the gas, making the combustion speed of the gas faster and the combustion efficiency higher.

[0065] In one embodiment of the present invention, the number of first nozzles 21 is not less than 12 and not more than 24, the distance between adjacent first nozzles 21 is not less than 10 mm and not more than 40 mm, and the inner diameter of the first nozzle 21 is not less than 3.6 mm and not more than 7 mm; the number of second nozzles 31 is not less than 12 and not more than 24, the distance between adjacent second nozzles 31 is not less than 10 mm and not more than 40 mm, and the inner diameter of the second nozzle 31 is not less than 3.6 mm and not more than 7 mm.

[0066] When the number of first nozzles 21 is large, the inner diameter of the first nozzles 21 is increased accordingly to reduce the airflow velocity formed by the first nozzles 21, or the distance between adjacent first nozzles 21 is increased to ensure that the airflow entering the combustion chamber 10 can be fully combusted. The first nozzles 21 and the second nozzles 31 are adapted to each other.

[0067] In an optional embodiment of the present invention, the number of first nozzles 21 is 10, the distance between adjacent first nozzles 21 is 18mm, and the inner diameter of the first nozzle 21 is 4mm; the number of second nozzles 31 is 10, the distance between adjacent second nozzles 31 is 18mm, and the inner diameter of the second nozzle 31 is 4mm.

[0068] Please see Figure 2 and Figure 3 In this embodiment, the cross-sectional velocity uniformity of the first nozzle 21 and the second nozzle 31 is good, with an experimentally calculated uniformity coefficient of 0.935. The outlet cross-sectional center uniformity of the first nozzle 21 and the second nozzle 31 is also very good, with a relatively low boundary velocity only due to the influence of the boundary layer. By adopting the above configuration, the gas uniformity within the combustion chamber 10 can be improved, resulting in more uniform gas combustion and thus reducing the emission of harmful gases. The first nozzle 21 and the second nozzle 31 have less impact on the inner wall of the combustion chamber 10, which helps to reduce the problem of gas impinging on the wall and also avoids the problem of overheating of the inner wall of the combustion chamber 10.

[0069] Please see Figure 4 In one embodiment of the present invention, the burner further includes an air intake shroud 11, the air intake shroud 11 forming an air intake chamber and an air intake pipe 12 communicating with the air intake chamber; the air intake shroud 11 is disposed on the side of the first sidewall 20 facing away from the combustion chamber 10, and the end of the first nozzle 21 away from the combustion chamber 10 is connected to the air intake chamber; and / or, the air intake shroud 11 is disposed on the side of the second sidewall 30 facing away from the combustion chamber 10, and the end of the second nozzle 31 away from the combustion chamber 10 is connected to the air intake pipe 12.

[0070] The intake pipe 12 is used to input a mixture of combustible gas into the intake chamber. The intake shroud 11 forms a chamber for airflow to enter the first nozzle 21 and / or the second nozzle 31. When the airflow enters the intake chamber from the intake pipe 12, the airflow can be mixed again in the intake chamber, so that the fuel gas and air in the mixture can be fully mixed. When the airflow is injected into the combustion chamber 10 from the first nozzle 21 and / or the second nozzle 31, the combustion will be more complete. The gas through multiple first nozzles and / or multiple second nozzles is more uniform. When the gas is injected into the combustion chamber to form a flame, the heat generated on the inner wall of the combustion chamber is also relatively more uniform, thereby avoiding deformation of the first side wall and / or the second side wall due to uneven heating.

[0071] Optionally in this embodiment, the air intake shroud 11 includes: a rear cover 13; a front cover 14, which is disposed opposite to the rear cover 13 and has a through hole; and a side panel 15, which is disposed between the rear cover 13 and the front cover 14. The front cover 14, the rear cover 13, and the side panel 15 enclose the air intake cavity, and the air intake pipe 12 is connected to the side panel 15 or the rear cover 13. When the air intake shroud 11 is disposed on the side of the first side wall 20 facing away from the combustion chamber 10, the first nozzle 21 is connected to the air intake cavity through the through hole. When the air intake shroud 11 is disposed on the side of the second side wall 30 facing away from the combustion chamber 10, the second nozzle 31 is connected to the air intake cavity through the through hole.

[0072] The side panel 15 forms the overall annular outline of the air intake cavity, and the front cover 14 and the rear cover 13 respectively cover the two ends of the side panel 15 to enclose and form the air intake cavity.

[0073] When the air intake shroud 11 is used to supply air to the first nozzle 21, the air intake shroud 11 is disposed on the side of the first side wall 20 facing away from the combustion chamber 10, the front cover 14 is attached to the first side wall 20, and the first nozzle 21 is connected to the through hole on the front cover 14.

[0074] When the air intake shroud 11 is used to supply air to the second nozzle 31, the air intake shroud 11 is located on the side of the second side wall 30 facing away from the combustion chamber 10, the front cover 14 is attached to the second side wall 30, and the second nozzle 31 is connected to the through hole on the front cover 14.

[0075] The air intake pipe 12 can be located at one end of the air intake shroud 11 away from the first nozzle 21 and the second nozzle 31, so that the airflow has a longer flow path after entering the air intake shroud 11, so that the airflow can be fully mixed in the air intake shroud 11.

[0076] In this embodiment, two air intake shrouds 11 are provided on the burner. The two air intake shrouds 11 are used to supply air to the first nozzle 21 and the second nozzle 31, respectively. The air intake shroud 11 located on the side of the first sidewall 20 facing away from the combustion chamber 10 is the first air intake shroud. The first nozzle 21 is connected to the first air intake shroud, and the first air intake shroud is provided with a first air intake pipe 23. The air intake shroud 11 located on the side of the second sidewall 30 facing away from the combustion chamber 10 is the second air intake shroud. The second nozzle 31 is connected to the second air intake shroud, and the second air intake shroud is provided with a second air intake pipe 33.

[0077] The first air intake hood includes a first rear cover 24, a first side panel 22, and a first front cover 26. The first rear cover 24, the first side panel 22, and the first front cover 26 form a first air intake chamber. The first front cover 26 is attached to the side of the first side wall 20 facing away from the combustion chamber 10. The first nozzle 21 is connected to a through hole on the first front cover 26.

[0078] The second air intake shroud includes a second rear cover 34, a second side panel 32, and a second front cover 36. The second rear cover 34, the second side panel 32, and the second front cover 36 together form a second air intake chamber. The second front cover 36 is attached to the side of the second sidewall 30 facing away from the combustion chamber 10. The second nozzle 31 communicates with a through hole on the second front cover 36. The shape and size of the first air intake shroud and the second air intake shroud can be consistent so that the initial parameters of the airflow delivered to the first nozzle 21 and the second nozzle 31 are consistent.

[0079] Please see Figure 4 and Figure 5 In one embodiment of the present invention, a baffle 16 is provided in the air intake chamber, which divides the air intake chamber into a first chamber near the air intake pipe 12 and a second chamber away from the air intake pipe 12. The baffle 16 has a flow-through hole 17 connecting the first chamber and the second chamber. When the air intake shroud 11 is located on the side of the first sidewall 20 facing away from the combustion chamber 10, the first nozzle 21 connects to the second chamber. When the air intake shroud 11 is located on the side of the second sidewall 30 facing away from the combustion chamber 10, the second nozzle 31 connects to the second chamber. Airflow enters the first chamber from the air intake pipe 12, is turbulent by the baffle 16, enters the second chamber via the flow-through hole 17, and is then sprayed into the combustion chamber 10 through the first nozzle 21 and / or the second nozzle 31.

[0080] The flow-through hole 17 is a through hole provided on the baffle 16, and the flow-through hole 17 is arranged along the length direction of the baffle 16. The baffle 16 separates the air intake chamber, forming two independent chambers. Airflow can only enter the second chamber through the flow-through hole 17 on the baffle 16. Under the action of the baffle 16, the airflow direction changes, allowing the combustion gas and air in the airflow to mix fully, thereby making the mixed airflow delivered to the first nozzle 21 and / or the second nozzle 31 more uniform, thus improving the combustion efficiency of the combustible gas.

[0081] In order to improve the mixing efficiency of the gas, in this embodiment, the direction of the airflow channel formed by the intake pipe 12 is parallel to the length direction of the spoiler 16, and the effective flow area of ​​the flow hole 17 at the end closer to the intake pipe 12 is greater than the effective flow area of ​​the flow hole 17 at the end farther away from the intake pipe 12.

[0082] Airflow enters the first chamber through the intake pipe 12. Since the airflow channel formed by the intake pipe 12 is parallel to the length direction of the spoiler 16, the airflow rate at the end of the first chamber furthest from the intake pipe 12 is relatively large. Increasing the effective flow area of ​​the flow-through orifice 17 near the end of the intake pipe 12 increases the airflow rate on that side, preventing pressure differences at different positions of the first nozzle 21 and / or the second nozzle 31 when airflow enters the second chamber from the flow-through orifice 17 on the side furthest from the intake pipe 12. Changing the effective flow area of ​​the corresponding flow-through orifice helps improve airflow uniformity.

[0083] When the airflow channel direction of the air intake pipe 12 is set parallel to the length direction of the baffle 16, the air intake pipe 12 can be set close to the side of the air intake cover 11 to save space on the side of the burner and facilitate the internal structure layout of the water heater.

[0084] The effective flow area refers to the area of ​​the cross-section of the flow orifice 17 perpendicular to the airflow direction. The larger the effective flow area, the larger the area of ​​the cross-section of the flow orifice 17 perpendicular to the airflow direction. The flow orifice 17 can be a round hole, a square hole, or a combination of multiple holes.

[0085] Optionally, the spoiler 16 has a wavy structure along its length, and the flow holes 17 are disposed on the rising surface and / or falling surface of the wavy structure. The spoiler 16 has rising and falling surfaces so that when the airflow flows toward the spoiler 16, it can be deflected by the rising and / or falling surfaces of the spoiler 16, thereby allowing the fuel gas and air in the airflow to mix more fully and helping to improve the uniformity of the gas.

[0086] In one embodiment, the effective flow area of ​​the first chamber gradually increases from the air intake pipe 12 toward the spoiler 16. The first chamber is gradually expanded so that the airflow can gradually disperse after entering the first chamber. The end of the first chamber near the spoiler 16 can form a larger mixing space, so that the airflow can have higher uniformity in the first chamber.

[0087] When the airflow flows toward the baffle 16, it can be dispersed in the first chamber and further input into the second chamber through the flow hole 17 to avoid uneven air pressure in different parts of the baffle 16.

[0088] Since the spoiler 16 divides the air intake chamber into two parts, when the first chamber is gradually expanded, one side of the first chamber of the air intake shroud 11 can form as shown in the image. Figure 4 The V-shaped structure in the middle facilitates the layout of the air intake pipe 12. The air intake pipe 12 can be set on the side with the smallest effective flow area in the first chamber, so that a space for installing the air intake pipe 12 is formed outside the air intake shroud 11, thereby improving the space utilization of the burner.

[0089] In this embodiment, a first baffle 25 is provided in the first air intake chamber and a second baffle 35 is provided in the second air intake chamber, so as to improve the uniformity of the gas delivered to the first nozzle and the second nozzle 31, respectively.

[0090] In one embodiment of the invention, the burner further includes a heat pipe 40 disposed near the first sidewall 20 and / or the second sidewall 30. The heat pipe 40 is used to input cold water, which exchanges heat with the first sidewall 20 and / or the second sidewall 30 to reduce the temperature of the first sidewall 20 and the second sidewall 30.

[0091] Since the first nozzle 21 and the second nozzle 31 are disposed on the side wall of the housing, by reducing the temperature of the first side wall 20 and the second side wall 30, the temperature of the first nozzle 21 and the second nozzle 31 can be reduced, which in turn helps to reduce the flow rate of the airflow injected by the first nozzle 21 and the second nozzle 31, and helps to improve combustion efficiency.

[0092] The heat-conducting pipe 40 can be located inside or outside the combustion chamber 10. To improve heat exchange efficiency, in this embodiment, the heat-conducting pipe 40 is located on the side of the first sidewall 20 and / or the second sidewall 30 facing the combustion chamber 10. When manufacturing the burner, a metal heat-conducting element can be provided on the heat-conducting pipe 40, and connected to the first nozzle 21 and / or the second nozzle 31 to achieve rapid heat conduction. Since the heat-conducting pipe carries away some of the heat from the combustion chamber, in this embodiment, the output end of the heat-conducting pipe can be connected to the heat exchange pipe of the water heater to allow for secondary heat utilization.

[0093] To facilitate the fixing of the heat pipe 40, a locking groove 27 can be provided on the first side wall 20 or the second side wall 30 to lock the heat pipe 40 into the locking groove 27, thereby fixing the heat pipe 40 and increasing the heat exchange area between the heat pipe 40 and the first side wall 20 and the second side wall 30.

[0094] Please see Figure 1 and Figure 4 In one embodiment of the present invention, the housing further includes: a third sidewall 50, on which a first protrusion 51 is provided; and a fourth sidewall 60, which is disposed opposite to the third sidewall 50. The first sidewall 20, the third sidewall 50, the second sidewall 30 and the fourth sidewall 60 enclose the combustion chamber 10. The fourth sidewall 60 is provided with a second protrusion 61. The heat pipe 40 is connected to the first protrusion 51 and the second protrusion 61 respectively.

[0095] The first convex 51 forms a hollow cavity on the third sidewall 50, and the second convex 61 forms a hollow cavity on the fourth sidewall 60. Water from the heat pipe 40 can be output through the first convex 51 and the second convex 61 to cool the third sidewall 50 and the fourth sidewall 60.

[0096] The present invention also proposes an embodiment of a water heater, the water heater comprising a burner as described in any of the above embodiments.

Claims

1. A burner for a water heater, characterized in that, The burner includes: The housing has a combustion chamber, and the housing has a first sidewall and a second sidewall, which are disposed opposite to each other. Multiple first nozzles are disposed on the first sidewall; and Multiple second nozzles are disposed on the second sidewall, and the axes of the first nozzle and the second nozzles are offset from each other; A preheater is used to preheat the gas to a target temperature before delivering it to the combustion chamber; Wherein, gas and / or air are injected into the combustion chamber through the first nozzle and the second nozzle, so that a high-temperature air combustion reaction takes place in the combustion chamber; An air intake hood has an air intake chamber and an air intake pipe that connects to the air intake chamber. A baffle is provided inside the air intake chamber. The baffle divides the air intake chamber into a first chamber close to the air intake pipe and a second chamber away from the air intake pipe. The baffle is provided with a flow hole that connects the first chamber and the second chamber. The airflow channel formed by the intake pipe is parallel to the length direction of the spoiler. The effective flow area of ​​the flow hole at the end closer to the intake pipe is greater than the effective flow area of ​​the flow hole at the end farther from the intake pipe. The effective flow area refers to the area of ​​the cross section of the flow hole perpendicular to the airflow direction. From the direction of the air intake pipe toward the spoiler, the effective flow area of ​​the first chamber gradually increases, and the first chamber is arranged in a gradually expanding manner; The spoiler has a wavy structure along its length. The flow holes are provided on the rising surface and / or falling surface of the wavy structure. Some of the flow holes on the rising surface and / or falling surface are single round holes, some of the flow holes on the rising surface and / or falling surface are single square holes, and some of the flow holes on the rising surface and / or falling surface are multi-hole.

2. The burner as claimed in claim 1, characterized in that, The orthographic projection of the first nozzle onto the second sidewall is located at the midpoint between two adjacent second nozzles.

3. The burner as described in claim 1, characterized in that, The first nozzle and the second nozzle are arranged parallel to each other.

4. The burner as claimed in claim 1, characterized in that, The number of the first nozzles is not less than 12 and not more than 24, the distance between adjacent first nozzles is not less than 10mm and not more than 40mm, and the inner diameter of the first nozzle is not less than 3.6mm and not more than 7mm. The number of the second nozzles shall be no less than 12 and no more than 24, the distance between adjacent second nozzles shall be no less than 10 mm and no more than 40 mm, and the inner diameter of the second nozzles shall be no less than 3.6 mm and no more than 7 mm.

5. The burner as described in claim 4, characterized in that, The number of the first nozzles is 10, the spacing between adjacent first nozzles is 18 mm, and the inner diameter of the first nozzle is 4 mm; and / or The number of the second nozzles is 10, the spacing between adjacent second nozzles is 18mm, and the inner diameter of the second nozzle is 4mm.

6. The burner as claimed in claim 1, characterized in that, The burner also includes: The air intake shroud is located on the side of the first sidewall facing away from the combustion chamber, and the end of the first nozzle away from the combustion chamber is connected to the air intake cavity; and / or The air intake shroud is located on the side of the second sidewall facing away from the combustion chamber, and the end of the second nozzle away from the combustion chamber is connected to the air intake pipe.

7. The burner as claimed in claim 6, characterized in that, When the air intake shroud is located on the side of the first sidewall facing away from the combustion chamber, the first nozzle is connected to the second chamber; when the air intake shroud is located on the side of the second sidewall facing away from the combustion chamber, the second nozzle is connected to the second chamber.

8. The burner as claimed in claim 6, characterized in that, The air intake shroud includes: Back cover; A front cover, disposed opposite to the rear cover, wherein the front cover has a through hole; and A side panel is disposed between the rear cover and the front cover. The front cover, the rear cover, and the side panel together form the air intake chamber. The air intake pipe is connected to the side panel or the rear cover. When the air intake hood is disposed on the side of the first side wall facing away from the combustion chamber, the first nozzle is connected to the air intake chamber through the through hole. When the air intake hood is disposed on the side of the second side wall facing away from the combustion chamber, the second nozzle is connected to the air intake chamber through the through hole.

9. The burner as claimed in claim 1, characterized in that, The burner also includes a heat pipe disposed close to the first sidewall and / or the second sidewall.

10. The burner as claimed in claim 9, characterized in that, The heat pipe is located on the side of the first sidewall and / or the second sidewall facing the combustion chamber.

11. The burner as claimed in claim 9, characterized in that, The housing also includes: A third sidewall, wherein a first protrusion is provided on the third sidewall; and The fourth sidewall is disposed opposite to the third sidewall. The first sidewall, the third sidewall, the second sidewall and the fourth sidewall enclose the combustion chamber. The fourth sidewall is provided with a second convex bulge. Hollow cavities are formed in the first convex bulge and the second convex bulge. The heat-conducting pipe is connected to the first convex bulge and the second convex bulge respectively.

12. A water heater, characterized in that, The water heater includes a burner as described in any one of claims 1 to 11.

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