Burner and water heating device

Abstract

The embodiment of the present application provides a burner and water heating equipment, which belongs to the field of fuel heating. The burner includes a cover and a fire grate. The fire grate is at least partially located in the cover. The fire grate and the cover are arranged to form a reaction zone. The fire grate is formed with a first air duct, a mixing chamber and a first through hole. The first air duct is used to receive primary air. The mixing chamber is connected to the reaction zone. The mixing chamber and the first air duct are connected through the first through hole. At least two first through holes are flame stabilizing holes. The mixing chamber has a fuel-air mixing section that is at least partially located at one end of the mixing chamber facing the reaction zone. The position where the flame stabilizing hole intersects the fuel-air mixing section is downstream of the mixing starting position of the fuel-air mixing section. Flame stabilizing holes are provided on opposite sides of the fuel-air mixing section, and the flame stabilizing holes on both sides are arranged relative to each other. The burner and water heating equipment of the embodiment of the present application can improve flame stability and reduce the possibility of flame extinction.

Description

Technical Field

[0001] The present application relates to the technical field of fuel heating, and in particular to a burner and a water heating device. Background Art

[0002] In the water heating equipment in the related art, the burner has the problem of unstable flame during the fuel combustion process, and the flame may go out. Summary of the Invention

[0003] In view of this, embodiments of the present application hope to provide a burner and a water heating device to improve flame stability and reduce the possibility of flame extinction.

[0004] To achieve the above objectives, a first aspect of an embodiment of the present application provides a burner, comprising:

[0005] housing; and

[0006] A fire bar is at least partially located in the cover, and the fire bar and the cover form a reaction zone. The fire bar is formed with a first air duct, a mixing chamber and a first through hole. The first air duct is used to receive primary air, and the mixing chamber is connected to the reaction zone. The mixing chamber and the first air duct are connected through the first through hole. At least two of the first through holes are flame-stabilizing holes. The mixing chamber has a fuel-air mixing section that is at least partially located at one end of the mixing chamber facing the reaction zone. The position where the flame-stabilizing hole intersects the fuel-air mixing section is downstream of the mixing starting position of the fuel-air mixing section. The flame-stabilizing holes are provided on opposite sides of the fuel-air mixing section, and the flame-stabilizing holes on both sides are arranged relative to each other.

[0007] In one embodiment, the flame stabilizing holes on both sides are arranged symmetrically.

[0008] In one embodiment, the central axis of the flame stabilizing hole is arranged to intersect with the central axis of the mixing chamber.

[0009] In one embodiment, at least two of the first through holes are mixing holes, and the mixing holes are provided on opposite sides of the mixing chamber. The mixing holes on both sides are arranged relatively to each other, and the position where the mixing holes intersect with the mixing chamber is the mixing starting position of the fuel-air mixing section. The fire bar is also formed with a second through hole connected to the mixing chamber, and the second through hole is used to introduce fuel into the mixing chamber. The position where the second through hole intersects with the mixing chamber is located upstream of the mixing starting position of the fuel-air mixing section.

[0010] In one embodiment, the axial direction of the mixing hole and the axial direction of the second through hole are arranged to intersect.

[0011] In one embodiment, the sum of the flow areas of all the first through holes is greater than or equal to 5 times the sum of the flow areas of all the second through holes, and the sum of the flow areas of all the first through holes is less than or equal to 10 times the sum of the flow areas of all the second through holes.

[0012] In one embodiment, there are multiple fire bars, which are arranged at intervals. The multiple fire bars and the cover shell form a second air duct, and the second air duct is used to receive secondary air.

[0013] In one embodiment, the minimum flow area of ​​the second air duct is the first area, the flow area of ​​all the first through holes is the second area, the ratio of the second area to the sum of the first area and the second area is the second area ratio, the ratio of the volume of the primary air to the sum of the volume of the primary air and the volume of the secondary air is the primary air ratio, the second area ratio is greater than or equal to the difference between the primary air ratio and 5%, the second area ratio is less than or equal to the sum of the primary air ratio and 5%, and the primary air ratio is 50% to 70%.

[0014] In one embodiment, there are multiple mixing chambers, and the multiple mixing chambers are arranged at intervals.

[0015] In one embodiment, the fire bar comprises:

[0016] an air hood at least partially located within the housing, the air hood and the housing enclosing the reaction zone, the first air channel being formed on a side of the air hood facing away from the reaction zone; and

[0017] The communicating vessel is at least partially located in the first air passage, the communicating vessel is connected to the air cover, and the mixing chamber and the first through hole are formed in the communicating vessel.

[0018] In one embodiment, there are multiple communicating vessels, and the multiple communicating vessels are arranged at intervals.

[0019] In one embodiment, the fire bar further includes a fuel supply mechanism connected to the communicating vessel, wherein the fuel supply mechanism is formed with a fuel cavity and a second through hole, and the fuel cavity and the mixing cavity are communicated with each other through the second through hole.

[0020] In one embodiment, the fuel supply mechanism includes:

[0021] a supply container connected to an end of the communicating vessel away from the reaction zone, the fuel cavity and the second through hole being formed in the supply container; and

[0022] An injection pipe is connected to an end of the supply container away from the communicating vessel, the injection pipe is at least partially located outside the first air channel, and the injection pipe is communicated with the fuel chamber.

[0023] In one embodiment, the supply container comprises:

[0024] a container body connected to the injection pipe; and

[0025] A cover plate is connected to the communicating vessel, covers the container body, and the cover plate and the container body enclose the fuel cavity. The second through hole is formed in the cover plate.

[0026] A second aspect of an embodiment of the present application provides a water heating device, comprising:

[0027] Burners of any of the above types;

[0028] a heat exchanger located at one end of the housing to receive heat released from the housing to heat water in the heat exchanger; and

[0029] A fan is used to provide power to the primary air so that the primary air flows toward the reaction zone.

[0030] In the burner of the embodiment of the present application, the mixing chamber is connected to the reaction zone, and the fuel-air mixture in the fuel-air mixing section of the mixing chamber flows to the reaction zone for combustion. Since the intersection of the flame-stabilizing hole and the fuel-air mixing section is located downstream of the mixing start position of the fuel-air mixing section, the fuel and primary air begin to mix at the mixing start position to form a fuel-air mixture that flows toward the downstream flame-stabilizing hole. Since the flame-stabilizing holes on both sides are relatively arranged, the primary air in the first air channel enters the fuel-air mixing section through the relatively arranged flame-stabilizing holes on both sides, collides to form turbulence and is further mixed with the fuel-air mixture, thereby enhancing the turbulence intensity of the fuel-air mixture and forming multiple cyclones in the fuel-air mixture, which is beneficial to enhancing the stability of the flame and reducing the possibility of flame extinction. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic structural diagram of a combustion device according to an embodiment of the present application, showing one end of the fire bar facing the reaction zone;

[0032] Figure 2 This is a schematic structural diagram of a combustion device according to an embodiment of the present application, showing an end of the fire bar facing away from the reaction zone;

[0033] Figure 3 This is a schematic structural diagram of a combustion device according to an embodiment of the present application, showing a cutaway position and an enlarged position of the combustion device;

[0034] Figure 4 for Figure 3 Cross-sectional view at position AA;

[0035] Figure 5 for Figure 4 Magnified view at position C in the middle;

[0036] Figure 6 for Figure 3 Magnified view at position B in the middle;

[0037] Figure 7 This is a schematic structural diagram of a fire bar according to an embodiment of the present application;

[0038] Figure 8 This is an exploded view of the fire bar according to an embodiment of the present application.

[0039] Explanation of the reference numerals: cover 1; fire grate 2; first air duct 21; fuel chamber 22; mixing chamber 23; air outlet 231; fuel-air mixing section 232; feed section 233; flame stabilizing hole 241; mixing hole 242; second through hole 25; air hood 26; top wall 261; communicating vessel 27; fuel supply mechanism 28; supply container 281; cover plate 2811; container body 2812; injection pipe 282; reaction zone 3; second air duct 4. DETAILED DESCRIPTION

[0040] It should be noted that, unless there is a conflict, the embodiments and technical features in the embodiments of this application can be combined with each other, and the detailed description in the specific implementation method should be understood as an explanation of the purpose of this application and should not be regarded as an improper restriction on this application.

[0041] In the description of the embodiments of the present application, "upper", "lower", "top", "bottom", orientation or position relationship is based on the attached Figure 4 It should be understood that these directional terms are only used to facilitate the description of this application and simplify the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting this application. Figure 4 , the up and down directions are the directions indicated by arrow R1 in the figure.

[0042] As part of the creative concept of this application, before describing the embodiments of this application, it is necessary to analyze the reasons why the burner flame of the water heating equipment in the related art is unstable and may go out, and obtain the technical solution of the embodiments of this application through reasonable analysis.

[0043] In the related art, the fuel and the primary air are pre-mixed in the fire grate to form a fuel-air mixture, and the fuel-air mixture enters the reaction zone for combustion. For some specific combustion requirements, the fuel in the fuel-air mixture is diluted by the primary air, and the proportion of fuel is relatively low. When such a fuel-air mixture burns under high temperature and high pressure, the flame propagation speed formed by the combustion of the fuel-air mixture under high temperature and high pressure is relatively fast, and the flame can burn relatively stably, and the flame will basically not go out. For example, when such a fuel-air mixture burns in a gas turbine, the fuel-air mixture is under high temperature and high pressure conditions, and the flame will basically not go out. However, for commonly used household water heating equipment, such as gas water heaters, it is difficult to reach such high temperatures and pressures during the fuel combustion process, the flame propagation speed is relatively slow, it is difficult to maintain stable combustion, and there is a possibility that the flame will go out. Research has found that the stability of the flame is not only related to the propagation speed of the flame, but also related to the turbulence intensity of the fuel-air mixture at the opening of the mixing chamber toward the reaction zone. In the related art, the turbulence intensity of the fuel-air mixture at the opening of the mixing chamber toward the reaction zone is low, and it is difficult to form multiple cyclones. If the turbulence intensity of the fuel-air mixture at the opening of the mixing chamber toward the reaction zone can be increased, so that the fuel-air mixture forms multiple cyclones at the opening of the mixing chamber toward the reaction zone, even if higher temperature and pressure are not reached, the stability of the flame can be improved and the possibility of flame extinction can be reduced.

[0044] In view of this, an embodiment of the present application provides a water heating device, comprising a burner, a heat exchanger, and a fan. The burner is used to heat water in the heat exchanger, and the fan is used to provide the burner with air required for combustion.

[0045] It should be noted that the water heating equipment provides the air required for combustion to the burner through a fan. The temperature and pressure of the fuel and air in the burner are low during the combustion process, making it difficult to achieve a faster flame propagation speed under high temperature and high pressure conditions.

[0046] In one embodiment, the water heating device may be a gas water heater.

[0047] For the burner of the embodiment of this application, please refer to Figures 1 to 5, including a cover shell 1 and a fire bar 2. The fire bar 2 is at least partially located in the cover shell 1, and the fire bar 2 and the cover shell 1 enclose a reaction zone 3. The fire bar 2 is formed with a first air duct 21, a mixing chamber 23 and a first through hole. The first air duct 21 is used to receive primary air. The mixing chamber 23 is communicated with the reaction zone 3. The mixing chamber 23 and the first air duct 21 are communicated through the first through hole. At least two of the first through holes are flame-stabilizing holes 241. The mixing chamber 23 has a fuel-air mixing section 232 at least partially located at one end of the mixing chamber 23 facing the reaction zone 3. The position where the flame-stabilizing hole 241 intersects the fuel-air mixing section 232 is located downstream of the mixing starting position of the fuel-air mixing section 232. The flame-stabilizing holes 241 are provided on opposite sides of the fuel-air mixing section 232, and the flame-stabilizing holes 241 on both sides are arranged oppositely. With such a structural form, the mixing chamber 23 is connected with the reaction zone 3, and the fuel-air mixture in the fuel-air mixing section 232 of the mixing chamber 23 flows to the reaction zone 3 for combustion. Since the intersection of the flame-stabilizing hole 241 and the fuel-air mixing section 232 is located downstream of the mixing start position of the fuel-air mixing section 232, the fuel and primary air begin to mix at the mixing start position to form a fuel-air mixture that flows toward the downstream flame-stabilizing hole 241. Since the flame-stabilizing holes 241 on both sides are relatively arranged, the primary air in the first air channel 21 enters the fuel-air mixing section 232 through the flame-stabilizing holes 241 arranged relatively on both sides, collides to form turbulence and is further mixed with the fuel-air mixture, thereby enhancing the turbulence intensity of the fuel-air mixture and forming multiple cyclones in the fuel-air mixture, which is beneficial to enhancing the stability of the flame and reducing the possibility of flame extinction.

[0048] It should be noted that the position where the flame stabilizing hole 241 intersects the fuel-air mixing section 232 is located downstream of the mixing start position of the fuel-air mixing section 232. The upstream and downstream here are based on the approximate flow direction of the airflow in the mixing chamber 23. For example, the airflow in the mixing chamber 23 gradually flows toward the reaction zone 3. One position is closer to the opening of the mixing chamber 23 at one end toward the reaction zone 3 relative to the other position along the axis of the mixing chamber 23. The position close to the opening at one end of the mixing chamber 23 toward the reaction zone 3 is the downstream position, and the position away from the opening at one end of the mixing chamber 23 toward the reaction zone 3 is the upstream position.

[0049] It should be noted that primary air refers to air that is pre-mixed with fuel to form a fuel-air mixture. The fuel-air mixture flows through the fire bar 2 to the reaction zone 3 for combustion.

[0050] It should be noted that the reaction zone 3 refers to the area where the fuel and primary air in the fuel-air mixture undergo combustion reaction.

[0051] It should be noted that the fuel-air mixture refers to a mixture of fuel and air. For example, the fuel-air mixture in the mixing chamber 23 is mainly a mixture of primary air and fuel.

[0052] It should be noted that the starting mixing position of the fuel-air mixing section 232 refers to the position where the fuel and primary air begin to contact and mix. The area within the mixing chamber 23 from the starting mixing position to the position where the mixing chamber 23 opens toward one end of the reaction zone 3 is the fuel-air mixing section 232.

[0053] In one embodiment, please refer to Figure 5 The mixing starting position of the fuel-air mixing section 232 is the position shown by the center line Q1 in the figure.

[0054] In one embodiment, please refer to Figure 5 The opening of the mixing chamber 23 at one end facing the reaction zone 3 is the gas outlet 231 shown in the figure.

[0055] In one embodiment, the turbulence intensity of the air outlet 231 can be maintained at approximately 10% to 20%.

[0056] It can be understood that the turbulence intensity can be set according to actual needs and is not limited to the above range.

[0057] In one embodiment, the fuel may be natural gas.

[0058] In one embodiment, the fuel may be pure hydrogen gas or hydrogen-rich synthetic gas.

[0059] In one embodiment, the heat exchanger is located at one end of the housing 1 to receive heat released from the housing 1 to heat water in the heat exchanger.

[0060] In one embodiment, the heat exchanger is located above the housing 1 .

[0061] In one embodiment, the fan is used to provide power to the primary air so that the primary air flows toward the reaction zone 3 , thereby enabling the fan to provide air to the reaction zone 3 .

[0062] In one embodiment, the fan can be an induced draft fan that forms a negative pressure. The induced draft fan is located downstream of the cover 1. Under the suction action of the induced draft fan, the primary air enters the mixing chamber 23 through the first air duct 21 and the first through hole, mixes with the fuel, and then flows to the reaction zone 3.

[0063] It can be understood that the induced draft fan is located downstream of the housing 1 , that is, the induced draft fan is located at the air outlet end of the housing 1 .

[0064] In one embodiment, referring to the figure, the induced draft fan is connected to the upper end of the cover.

[0065] In one embodiment, the fan can be a positive pressure blower located upstream of the fire bar 2 . The blower blows primary air through the first air channel 21 and the first through hole into the mixing chamber 23 to mix with the fuel and then flow to the reaction zone 3 .

[0066] It can be understood that the blower is located upstream of the fire bar 2 , that is, the blower is located at the air inlet end of the housing 1 .

[0067] In one embodiment, please refer to the figure, the blower is connected to the lower end of the housing 1.

[0068] It should be noted that the air pressure generated by the suction of the induced draft fan or the blowing of the blower is not too high, and the fuel-air mixture in the reaction zone burns under relatively low temperature and pressure conditions.

[0069] In one embodiment, please refer to Figure 4 and Figure 5 The first air channel 21 is located on the side of the fire bar 2 away from the reaction zone 3.

[0070] In one embodiment, please refer to Figure 4 and Figure 5 The mixing chamber 23 is at least partially located in the first air channel 21 , and the mixing chamber 23 is connected to the first air channel 21 through a first through hole located in the first air channel 21 .

[0071] In one embodiment, please refer to Figure 4 and Figure 5 With this structure, the momentum of the two primary air streams entering the fuel-air mixing section 232 from the flame stabilizing holes 241 on both sides is substantially the same, which is conducive to better collision and formation of multiple cyclones.

[0072] In one embodiment, the flame stabilization holes 241 on both sides may also be asymmetrically arranged. For example, among the flame stabilization holes 241 arranged opposite to each other on both sides, the flow area of ​​the flame stabilization holes 241 on one side is larger than the flow area of ​​the flame stabilization holes 241 on the other side.

[0073] In one embodiment, please refer to Figure 4 and Figure 5 The central axis of the flame stabilizing hole 241 is arranged to intersect the central axis of the mixing chamber 23. With this structure, multiple cyclones formed by the collision of air from the flame stabilizing holes 241 on both sides can rotate as much as possible in the plane intersecting the central axis of the mixing chamber 23, which is conducive to flame stabilization.

[0074] In one embodiment, please refer to Figure 4 and Figure 5 The central axis of the flame stabilizing hole 241 is perpendicular to the central axis of the mixing chamber 23.

[0075] In one embodiment, please refer to Figure 5 The central axis of the mixing chamber 23 is the center line Q2 shown in the figure.

[0076] In one embodiment, the flow cross section of the flame stabilization hole 241 is circular.

[0077] In one embodiment, the flow cross section of the flame stabilization hole 241 is polygonal in shape.

[0078] It is understandable that the shape of the flow cross section of the flame stabilizing hole 241 can be selected according to actual needs and is not limited to the above two shapes.

[0079] In one embodiment, please refer to Figure 4 and Figure 5 At least two first through holes are mixing holes 242, and mixing holes 242 are provided on opposite sides of the mixing chamber 23. The mixing holes 242 on both sides are arranged opposite to each other, and the position where the mixing holes 242 intersect the mixing chamber 23 is the mixing starting position of the fuel-air mixing section 232.

[0080] In one embodiment, please refer to Figure 4 and Figure 5 The fire bar 2 is also formed with a second through hole 25 connected to the mixing chamber 23. The second through hole 25 is used to introduce fuel into the mixing chamber 23. The intersection of the second through hole 25 and the mixing chamber 23 is located upstream of the mixing starting position of the fuel-air mixing section 232. With such a structural form, since the intersection of the second through hole 25 and the mixing chamber 23 is located upstream of the mixing starting position of the fuel-air mixing section 232, the fuel enters the mixing chamber 23 through the upstream second through hole 25 and flows to the mixing starting position of the fuel-air mixing section 232. The two primary air streams entering the mixing chamber 23 through the mixing holes 242 arranged opposite to each other on both sides collide at the mixing starting position of the fuel-air mixing section 232. The primary air colliding through the mixing holes 242 is intensely mixed with the fuel flowing from upstream to the mixing starting position of the fuel-air mixing section 232 to form a fuel-air mixture and flow to the reaction zone 3. Because the two streams of primary air passing through mixing holes 242 collide with the fuel and mix vigorously, the fuel and primary air form a relatively uniform fuel-air mixture over a relatively short distance. This results in a more uniform flame temperature, reducing the generation of thermal nitrogen oxides due to localized high flame temperatures. Furthermore, because the fuel and primary air form a relatively uniform fuel-air mixture over a relatively short distance, the fuel-air mixing section 232 can be shortened, reducing the risk of flashback.

[0081] In one embodiment, please refer to Figure 4 and Figure 5 , the second through hole 25 is located below the mixing hole 242 .

[0082] In one embodiment, please refer to Figure 4 and Figure 5 The mixing hole 242 is located below the flame stabilizing hole 241.

[0083] In one embodiment, please refer to Figure 4 and Figure 5The mixing chamber 23 further includes a feed section 233 located between the fuel-air mixing section 232 and the second through hole 25 . The fuel flows to the fuel-air mixing section 232 through the second through hole 25 and the feed section 233 .

[0084] In one embodiment, please refer to Figure 4 and Figure 5 The axial direction of the mixing hole 242 intersects the axial direction of the second through hole 25. With this structure, the primary air flowing into the mixing chamber 23 through the mixing hole 242 and the fuel flowing into the mixing chamber 23 through the second through hole 25 form a cross jet, which is conducive to uniform mixing of the fuel and the primary air.

[0085] In one embodiment, please refer to Figure 4 and Figure 5 The axial direction of the mixing hole 242 may be perpendicular to the axial direction of the second through hole 25 .

[0086] In one embodiment, please refer to Figure 4 and Figure 5 The fire bar 2 also forms a fuel cavity 22 , which is connected to the mixing cavity 23 via a second through hole 25 , and the fuel in the fuel cavity 22 flows to the corresponding mixing cavity 23 via the second through hole 25 .

[0087] In one embodiment, please refer to Figure 4 and Figure 5 The number of the mixing chamber 23 can be one or more.

[0088] In one embodiment, please refer to Figure 4 and Figure 5 Corresponding flame stabilizing holes 241 are provided on opposite sides of the fuel-air mixing section 232 of each mixing chamber 23.

[0089] In one embodiment, please refer to Figure 4 and Figure 5 , corresponding mixing holes 242 are provided on opposite sides of each mixing chamber 23 .

[0090] In one embodiment, please refer to Figure 4 and Figure 5 Multiple mixing chambers 23 are arranged at intervals. With this structure, each mixing chamber 23 forms an independent, smaller flame. These numerous independent flames create a more uniform temperature distribution within the housing 1, reducing localized high temperatures and extending the life of the heated components. For example, this can extend the life of the heated heat exchanger.

[0091] In one embodiment, please refer to Figure 3 and Figure 4, projected along the arrangement direction of the reaction zone 3 and the first gas channel 21, the projected area of ​​the mixing chamber 23 is located within the projected area of ​​the first gas channel 21. With this structural form, since the projected area of ​​the mixing chamber 23 is located within the projected area of ​​the first gas channel 21 along the arrangement direction of the reaction zone 3 and the first gas channel 21, the flow area of ​​the mixing chamber 23 is small. As the primary air enters the mixing chamber 23 with a small flow area from the first gas channel 21, the flow rate of the primary air increases, and the flow rate of the fuel-air mixture formed by the primary air and fuel in the mixing chamber 23 is faster, which can alleviate the risk of flashback caused by the low flow rate area of ​​the fuel-air mixture.

[0092] In one embodiment, please refer to Figure 4 and Figure 5 The second through hole 25 is located at one end of the mixing chamber 23 away from the reaction zone 3 , and the second through hole 25 is arranged opposite to the opening of the end of the mixing chamber 23 facing the reaction zone 3 .

[0093] In one embodiment, the sum of the flow areas of all first through-holes is greater than or equal to five times the sum of the flow areas of all second through-holes 25, and the sum of the flow areas of all first through-holes is less than or equal to ten times the sum of the flow areas of all second through-holes 25. With this structure, the relationship between the areas of the first through-holes and the areas of the second through-holes 25 is within a relatively suitable range. When sufficient primary air is present in the first air passage 21, the fuel-air mixture formed by the primary air entering the mixing chamber 23 through the first through-holes and mixing with the fuel has a high primary air content, resulting in a lean burn state. The fuel-air mixture also maintains a moderately low fuel content. The flame length in the lean burn state is shorter, allowing the height of the sidewalls of the housing 1 to be appropriately reduced, thereby reducing the volume of the burner. The flame in the lean burn state exhibits a certain lift, raising the bottom of the flame a certain distance from the opening of the mixing chamber 23 toward the reaction zone 3. This alleviates the problem of excessively high temperatures on the wall of the fire bar 2 toward the reaction zone 3 caused by the flame burning against the fire bar 2.

[0094] In one embodiment, please refer to Figure 4 and Figure 5 The sum of the flow areas of all the first through holes is the sum of the flow areas of all the flame stabilizing holes 241 plus the sum of the flow areas of all the mixing holes 242.

[0095] In one embodiment, please refer to Figure 4 and Figure 5 The axial direction of the first through hole is arranged to intersect with the axial direction of the second through hole 25 .

[0096] In one embodiment, the axial direction of the flame stabilizing hole 241 is intersected with the axial direction of the mixing hole 242. In this way, the fuel and the primary air, as well as the primary air-fuel-air mixture, are substantially in a cross-jet state.

[0097] In one embodiment, when the fuel and primary air, as well as the primary air-fuel-air mixture are roughly in a cross-jet state, the sum of the flow areas of all the first through holes is greater than or equal to 5 times the sum of the flow areas of all the second through holes 25, and the sum of the flow areas of all the first through holes is less than or equal to 10 times the sum of the flow areas of all the second through holes 25, so that the momentum of the primary air and the momentum of the fuel are more appropriate, and the primary air can be sprayed to the central axis position of the mixing chamber 23 as much as possible, which is beneficial to the uniform mixing of the primary air and the fuel, and is also beneficial to the collision of the primary air to stir the fuel-air mixture to form multiple cyclones to stabilize the flame.

[0098] In one embodiment, the sum of the flow areas of all the first through holes is S1, the sum of the flow areas of all the second through holes 25 is S2, 5*S2≤S1≤10*S1, where the operator “*” represents a product.

[0099] In one embodiment, please refer to Figure 4 and Figure 5 The number of fire bars 2 is multiple, and the multiple fire bars 2 are arranged at intervals.

[0100] In one embodiment, please refer to Figure 4 and Figure 5 A plurality of fire bars 2 and the cover 1 are arranged to form a second air duct 4, and the second air duct 4 is used to receive secondary air.

[0101] It should be noted that the secondary air refers to the air that flows into the reaction zone 3 without being pre-mixed with the fuel.

[0102] It is understandable that the secondary air entering the reaction zone 3 can reburn the unburned fuel and cool the end of the fire bar 2 facing the reaction zone 3 and the side wall of the housing 1.

[0103] In one embodiment, the minimum flow area of ​​the second air passage 4 is the first area, the flow area of ​​all first through holes is the second area, the ratio of the second area to the sum of the first and second areas is the second area ratio, the ratio of the volume of the primary air to the sum of the volume of the primary air and the volume of the secondary air is the primary air ratio, the second area ratio is greater than or equal to the difference between the primary air ratio and 5%, and the second area ratio is less than or equal to the sum of the primary air ratio and 5%. In this structural form, the primary air ratio is closely related to the first and second areas. By setting the relationship between the first and second areas, a desired primary air ratio can be obtained.

[0104] In one embodiment, the first area is S3, the second area is S4, and the proportion of the second area is S4 / (S3+S4).

[0105] In one embodiment, the volume of the primary air is V1, the volume of the secondary air is V2, and the proportion of the primary air is V1 / (V1+V2).

[0106] In one embodiment, V1 / (V1+V2)-5%≤S4 / (S3+S4)≤V1 / (V1+V2)+5%.

[0107] In one embodiment, please refer to Figures 3 to 6 The minimum flow cross-section of the second gas channel 4 is located in the plane P1 where the opening of the second gas channel 4 is away from the reaction zone 3. The minimum flow cross-section of the second gas channel 4 is the section P2 shown by the oblique line in the figure. Only a part of the section P2 is shown in the figure, and the entire section P2 is not shown.

[0108] In one embodiment, the secondary air flows into the reaction zone 3 through the second air duct 4 under the suction action of the induced draft fan or the blowing of the blower.

[0109] In one embodiment, the primary air accounts for 50% to 70%. With this structural form, through the arrangement of the first area and the second area, the primary air accounts for 50% to 70%, and the first air passage 21 can receive sufficient primary air, which is conducive to keeping the fuel-air mixture in the reaction zone 3 in a lean state.

[0110] In one embodiment, when the proportion of primary air is 50% to 70%, the proportion of secondary air is 30% to 50%.

[0111] In one embodiment, please refer to Figure 4 、 Figure 5 、 Figure 7 as well as Figure 8 The fire bar 2 includes an air hood 26 and a manifold 27. The air hood 26 is at least partially located in the housing 1. The air hood 26 and the housing 1 enclose a reaction zone 3. The first air duct 21 is formed on the side of the air hood 26 away from the reaction zone 3. The manifold 27 is at least partially located in the first air duct 21. The manifold 27 is connected to the air hood 26. The mixing chamber 23 and the first through hole are formed in the manifold 27. With such a structural form, the air hood 26 with the first air duct 21 is used to collect primary air. The primary air in the air hood 26 enters the fuel-air mixing section 232 of the mixing chamber 23 of the manifold 27 through the flame stabilizing holes 241 on the manifold 27 to enhance the turbulence intensity of the fuel-air mixture in the fuel-air mixing section 232. The fuel-air mixture flows out of the mixing chamber 23 and enters the reaction zone 3 enclosed by the air hood 26 and the housing 1 for combustion. By reasonably arranging the positions between the air hood 26 and the communicating vessel 27, and reasonably arranging the first air duct 21, the mixing chamber 23 and the first through hole on the corresponding air hood 26 and the communicating vessel 27, the communicating arrangement between the first air duct 21, the mixing chamber 23 and the first through hole is realized, which is beneficial to achieving the turbulence intensity of the fuel-air mixture in the fuel-air mixing section 232.

[0112] In one embodiment, please refer to Figure 5 and Figure 7The communicating vessel 27 passes through the top wall 261 of the air cover 26 .

[0113] In one embodiment, please refer to Figure 4 and Figure 5 , along the direction of the first gas channel 21 pointing to the reaction zone 3, the cross-sectional area of ​​the first gas channel 21 gradually decreases.

[0114] In one embodiment, please refer to Figure 4 、 Figure 5 、 Figure 7 as well as Figure 8 The number of communicating vessels 27 is multiple, and the multiple communicating vessels 27 are arranged at intervals. With this structure, since the mixing chamber 23 is formed in the communicating vessels 27, the multiple communicating vessels 27 are arranged at intervals so that the fuel-air mixture flowing out of each mixing chamber 23 and into the reaction zone 3 forms independent flames. The multiple independent flames make the temperature distribution in the housing 1 more uniform, reduce local high temperatures, and extend the service life of the heated components.

[0115] In one embodiment, please refer to Figure 4 and Figure 5 , the mixing chamber 23 has a columnar structure.

[0116] In one embodiment, please refer to Figures 3 to 7 The flow cross section of the mixing chamber 23 is rectangular.

[0117] In one embodiment, please refer to Figures 3 to 7 The flow cross section of the mixing chamber 23 is rectangular.

[0118] It is understandable that the specific shape of the flow cross section of the mixing chamber 23 is not limited and may be circular or diamond-shaped. The specific shape of the flow cross section may be selected according to actual needs.

[0119] In one embodiment, please refer to Figure 4 、 Figure 5 as well as Figure 8 The fire bar 2 further includes a fuel supply mechanism 28 connected to the communicating vessel 27. The fuel supply mechanism 28 is formed with a fuel cavity 22 and a second through hole 25. The fuel cavity 22 and the mixing cavity 23 are connected through the second through hole 25. With this structure, the fuel supply mechanism 28 can be used to centrally supply fuel and distribute the fuel to the corresponding mixing cavity 23 through the corresponding second through hole 25.

[0120] In one embodiment, please refer to Figure 1 、 Figure 2 、 Figure 4 as well as Figure 5The fuel supply mechanism 28 is connected to the end of the manifold 27 facing away from the reaction zone 3. This structure allows fuel to be easily supplied to the fuel chamber 22 of the fuel supply mechanism 28 without drilling holes in the sidewall of the housing 1, thereby better maintaining the integrity of the housing 1 and reducing unnecessary heat loss in the reaction zone 3.

[0121] In one embodiment, please refer to Figure 4 、 Figure 7 as well as Figure 8 The fuel supply mechanism 28 includes a supply container 281 and an injection pipe 282. The supply container 281 is connected to the end of the communicating vessel 27 away from the reaction zone 3, and the fuel cavity 22 and the second through hole 25 are formed in the supply container 281. The injection pipe 282 is connected to the end of the supply container 281 away from the communicating vessel 27. The injection pipe 282 is at least partially located outside the first gas channel 21, and the injection pipe 282 is connected to the fuel cavity 22. With such a structural form, since the injection pipe 282 is at least partially located outside the first gas channel 21, it is convenient to connect an external fuel supply pipeline, and the fuel injection operation can also be carried out more conveniently. The fuel enters the fuel cavity 22 of the supply container 281 through the injection pipe 282.

[0122] In one embodiment, please refer to Figure 8 The supply container 281 includes a container body 2812 and a cover plate 2811. The container body 2812 is connected to the injection pipe 282, and the cover plate 2811 is connected to the manifold 27. The cover plate 2811 covers the container body 2812, and the cover plate 2811 and the container body 2812 enclose a fuel chamber 22. A second through hole 25 is formed in the cover plate 2811. With such a structural form, the manifold 27 is connected to the cover plate 2811, which can maintain the position of the manifold 27 on the cover plate 2811 and better seal the opening of the manifold 27 toward one end of the cover plate 2811, ensuring that the second through hole 25 on the cover plate 2811 is connected to the corresponding mixing chamber 23, and the fuel enters the mixing chamber 23 through the second through hole 25. The fuel in the fuel chamber 22 is distributed to each mixing chamber 23 through the second through hole 25 on the cover plate 2811.

[0123] In one embodiment, the cover plate 2811 is integrally formed with the communicating vessel 27. With this structure, the communicating vessel 27 has a first through hole and a mixing chamber 23, and the cover plate 2811 has a second through hole 25. The integral formation of the cover plate 2811 and communicating vessel 27 facilitates the overall machining of the cover plate 2811 and communicating vessel 27, ensuring the positional accuracy of the second through hole 25 relative to the corresponding mixing chamber 23.

[0124] In one embodiment, the cover 2811 is detachably connected to the container body 2812 .

[0125] In one embodiment, the cover plate 2811 and the container body 2812 may also be connected in a non-detachable manner, for example, by welding.

[0126] The various embodiments / implementations provided in this application can be combined with each other without causing any contradiction.

[0127] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Persons skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A burner, characterized in that: include: Cover (1); as well as A fire bar (2) is at least partially located in the housing (1), the fire bar (2) and the housing (1) enclose a reaction zone (3), the fire bar (2) is formed with a first air channel (21), a mixing chamber (23) and a first through hole, the first air channel (21) is used to receive primary air, the mixing chamber (23) is communicated with the reaction zone (3), and the mixing chamber (23) and the first air channel (21) are communicated through the first through hole. At least two of the first through holes are flame-stabilizing holes (241), and the mixing chamber (23) has a fuel-air mixing section (232) at least partially located at one end of the mixing chamber (23) facing the reaction zone (3). The intersection of the flame-stabilizing holes (241) and the fuel-air mixing section (232) is located downstream of the mixing start position of the fuel-air mixing section (232). The flame-stabilizing holes (241) are provided on opposite sides of the fuel-air mixing section (232), and the flame-stabilizing holes (241) on both sides are arranged relative to each other, so that primary air can flow from the first air duct (21) through the flame-stabilizing holes (241) into the mixing chamber (23).

2. The burner according to claim 1, characterized in that The flame stabilizing holes (241) on both sides are arranged symmetrically.

3. The burner according to claim 1, characterized in that The central axis of the flame stabilizing hole (241) is arranged to intersect with the central axis of the mixing chamber (23).

4. The burner according to any one of claims 1 to 3, characterized in that: At least two of the first through holes are mixing holes (242), and the mixing holes (242) are provided on opposite sides of the mixing chamber (23). The mixing holes (242) on both sides are arranged relative to each other, and the position where the mixing holes (242) intersect with the mixing chamber (23) is the mixing starting position of the fuel-air mixing section (232). The fire bar (2) is also formed with a second through hole (25) connected to the mixing chamber (23), and the second through hole (25) is used to introduce fuel into the mixing chamber (23). The position where the second through hole (25) intersects with the mixing chamber (23) is located upstream of the mixing starting position of the fuel-air mixing section (232).

5. The burner according to claim 4, characterized in that The axial direction of the mixing hole (242) and the axial direction of the second through hole (25) are arranged to intersect.

6. The burner according to claim 4, characterized in that The sum of the flow areas of all the first through holes is greater than or equal to 5 times the sum of the flow areas of all the second through holes (25), and the sum of the flow areas of all the first through holes is less than or equal to 10 times the sum of the flow areas of all the second through holes (25).

7. The burner according to any one of claims 1 to 3, characterized in that: There are multiple fire bars (2), and the multiple fire bars (2) are arranged at intervals. The multiple fire bars (2) and the cover (1) are arranged to form a second air duct (4), and the second air duct (4) is used to receive secondary air.

8. The burner according to claim 7, characterized in that The minimum flow area of ​​the second air duct (4) is the first area, the flow area of ​​all the first through holes is the second area, the ratio of the second area to the sum of the first area and the second area is the second area ratio, the ratio of the volume of the primary air to the sum of the volume of the primary air and the volume of the secondary air is the primary air ratio, the second area ratio is greater than or equal to the difference between the primary air ratio and 5%, the second area ratio is less than or equal to the sum of the primary air ratio and 5%, and the primary air ratio is 50% to 70%.

9. The burner according to any one of claims 1 to 3, characterized in that: There are multiple mixing chambers (23), and the multiple mixing chambers (23) are arranged at intervals.

10. The burner according to claim 1, characterized in that The fire bar (2) comprises: an air hood (26) at least partially located within the housing (1), the air hood (26) and the housing (1) enclosing the reaction zone (3), the first air channel (21) being formed on a side of the air hood (26) facing away from the reaction zone (3); and A communicating vessel (27) is at least partially located in the first air passage (21), the communicating vessel (27) is connected to the air cover (26), and the mixing chamber (23) and the first through hole are formed in the communicating vessel (27).

11. The burner according to claim 10, characterized in that There are multiple communicating vessels (27), and the multiple communicating vessels (27) are arranged at intervals.

12. The burner according to claim 10 or 11, characterized in that The fire bar (2) further comprises a fuel supply mechanism (28) connected to the communicating vessel (27), wherein the fuel supply mechanism (28) is formed with a fuel cavity (22) and a second through hole (25), and the fuel cavity (22) and the mixing cavity (23) are communicated through the second through hole (25).

13. The burner according to claim 12, characterized in that The fuel supply mechanism (28) includes: a supply container (281) connected to an end of the communicating vessel (27) away from the reaction zone (3), the fuel cavity (22) and the second through hole (25) being formed in the supply container (281); and An injection pipe (282) is connected to one end of the supply container (281) away from the communicating vessel (27), the injection pipe (282) is at least partially located outside the first gas channel (21), and the injection pipe (282) is in communication with the fuel chamber (22).

14. The burner according to claim 13, characterized in that The supply container (281) comprises: a container body (2812) connected to the injection pipe (282); and A cover plate (2811) is connected to the communicating vessel (27), the cover plate (2811) covers the container body (2812), the cover plate (2811) and the container body (2812) enclose the fuel cavity (22), and the second through hole (25) is formed in the cover plate (2811).

15. A water heating device, characterized in that: include: The burner according to any one of claims 1 to 14; A heat exchanger is located at one end of the housing (1) to receive heat released from the housing (1) to heat water in the heat exchanger; as well as A fan is used to provide power to the primary air so that the primary air flows toward the reaction zone (3).

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