Combustion device and gas water heater

Abstract

The embodiments of the present application provide a combustion device and a gas water heater, belonging to the field of fuel heating technology. The combustion device includes a combustion chamber and a fire grate, which is at least partially located in the combustion chamber. The fire grate and the combustion chamber are arranged to form a combustion cavity. There is at least one fire grate, and each fire grate is formed with a first receiving cavity, an air supply cavity, and a mixing hole group. The air supply cavity and the mixing hole group are both located between the first receiving cavity and the combustion chamber. The air supply cavity is connected to the first receiving cavity and the combustion chamber, respectively. There are multiple mixing hole groups corresponding to each fire grate, and each mixing hole group includes at least one mixing hole. The mixing hole is connected to the air supply cavity. The opening of the air supply cavity toward one end of the combustion chamber is an air outlet. Along the length of the fire grate, the lengths of the flow paths from two adjacent mixing hole groups to the corresponding air outlets are unequal. The combustion device and gas water heater of the embodiments of the present application can reduce the possibility of thermoacoustic oscillation.

Description

Technical Field

[0001] The present application relates to the field of fuel heating technology, and in particular to a combustion device and a gas water heater. Background Art

[0002] In the related art, the flame formed by the combustion device of the gas water heater during the combustion process may generate thermoacoustic oscillations. Summary of the Invention

[0003] In view of this, embodiments of the present application hope to provide a combustion device and a gas water heater to reduce the possibility of thermoacoustic oscillation.

[0004] To achieve the above objectives, the first aspect of the present application provides a combustion device, comprising:

[0005] combustion chamber; and

[0006] A fire bar is at least partially located in the combustion chamber, and the fire bar and the combustion chamber are arranged to form a combustion chamber. There is at least one fire bar, and each fire bar is formed with a first receiving chamber, an air supply chamber and a mixing hole group. The air supply chamber and the mixing hole group are both located between the first receiving chamber and the combustion chamber, and the air supply chamber is communicated with the first receiving chamber and the combustion chamber respectively. There are multiple mixing hole groups corresponding to each fire bar, and each mixing hole group includes at least one mixing hole, which is communicated with the air supply chamber. The opening of the air supply chamber at one end facing the combustion chamber is an air outlet. Along the length direction of the fire bar, the lengths of the flow paths from two adjacent mixing hole groups to the corresponding air outlets are not equal.

[0007] In one embodiment, among two adjacent mixing hole groups along the length direction of the fire bar, one of the mixing hole groups is a first mixing hole group, and the other mixing hole group is a second mixing hole group. The length of the flow path from the first mixing hole group to the corresponding air outlet and the length of the flow path from the second mixing hole group to the corresponding air outlet are not equal. The first mixing hole group and the second mixing hole group are alternately arranged along the length direction of the fire bar.

[0008] In one embodiment, along the length direction of the fire bar, the length of the flow path from the mixing hole group to the corresponding air outlet changes periodically, and the length of the flow path from the mixing hole group to the corresponding air outlet first increases and then decreases or first decreases and then increases within one cycle.

[0009] In one embodiment, the first receiving chamber is used to receive primary air, and the mixing hole is used to provide fuel to the air supply chamber. The number of air supply chambers corresponding to each fire bar is at least one, and the mixing hole groups are provided on opposite sides of each air supply cavity. The mixing holes of the mixing hole groups on both sides are arranged relative to each other, and the relative arrangement direction of the mixing holes on both sides is arranged crosswise with the length direction of the fire bar.

[0010] In one embodiment, the lengths of the flow paths from all mixing holes in each mixing hole group to the corresponding air outlet are equal, and the length of the flow path from each mixing hole group to the air outlet is the length of the flow path from the corresponding mixing hole to the corresponding air outlet.

[0011] In one embodiment, the first receiving chamber is used to receive primary air, and the mixing hole is used to provide fuel to the air supply chamber, and the number of air supply chambers corresponding to each fire bar is one or more; along the length direction of the fire bar, among all the mixing hole groups corresponding to each fire bar, the mixing hole group located at one end of the air supply chamber is the third mixing hole group, and the length of the flow path from the third mixing hole group to the corresponding air outlet is the third distance, and the mixing hole group located at the other end of the air supply chamber is the fourth mixing hole group, and the length of the flow path from the fourth mixing hole group to the corresponding air outlet is the fourth distance, and the remaining mixing hole groups are all located between the third mixing hole group and the fourth mixing hole group, and the length of the flow path from the remaining mixing hole groups to the corresponding air outlet is greater than or equal to the larger of the third distance and the fourth distance.

[0012] In one embodiment, each fire bar corresponds to a plurality of air supply cavities, and the plurality of air supply cavities are arranged at intervals along the length direction of the fire bar, and each air supply cavity corresponds to one mixing hole group.

[0013] In one embodiment, the first receiving chamber is used to receive primary air, the air supply chamber is used to receive primary air from the first receiving chamber, the mixing hole is used to provide fuel to the air supply chamber, the opening at one end of the first receiving chamber away from the air supply chamber is an air collecting port, and the opening at one end of the air supply chamber toward the first receiving chamber is an air inlet, and the sum of the flow areas of all the air collecting ports is greater than the sum of the flow areas of all the air inlets.

[0014] In one embodiment, the first receiving chamber is used to receive primary air, the air supply chamber is used to receive primary air from the first receiving chamber, the mixing hole is used to provide fuel to the air supply chamber, the air supply chamber has a columnar structure, the flow cross-section of the air supply chamber is a target cross-section, the air supply chamber has a characteristic size, the characteristic size is the hydraulic diameter of the air supply chamber or the minimum span on the target cross-section through the geometric center of the target cross-section, the length of the flow path from the mixing hole to the corresponding air outlet is greater than or equal to the characteristic size, and the length of the flow path from the mixing hole to the corresponding air outlet is less than or equal to ten times the characteristic size.

[0015] In one embodiment, the first receiving chamber is used to receive primary air, the air supply chamber is used to receive primary air from the first receiving chamber, and the mixing hole is used to provide fuel to the air supply chamber. Along the direction from the first receiving chamber to the air supply chamber, the flow area of ​​the first receiving chamber gradually decreases, and the opening of the first receiving chamber toward one end of the air supply chamber is a transition port. Projected along the arrangement direction of the first receiving chamber and the air supply chamber, the opening of the air supply chamber toward one end of the first receiving chamber is an air inlet, and the projected area of ​​the air inlet is located within the projected area of ​​the transition port; the sum of the flow areas of all the air inlets is greater than or equal to 5 times the sum of the cross-sectional areas of all the mixing holes, and the sum of the flow areas of all the air inlets is less than or equal to 10 times the sum of the cross-sectional areas of all the mixing holes.

[0016] In one embodiment, the first receiving chamber is used to receive primary air, the air supply chamber is used to receive primary air from the first receiving chamber, the mixing hole is used to provide fuel to the air supply chamber, the opening of the air supply chamber at one end of the first receiving chamber facing the receiving chamber is an air inlet, and the opening of the first receiving chamber at one end facing the air inlet is a transition port. Projected along the arrangement direction of the first receiving chamber and the air supply chamber, the projected area of ​​the air inlet is located within the projected area of ​​the transition port; there are multiple fire bars, multiple fire bars are arranged at intervals, and multiple fire bars and the combustion chamber are enclosed to form an auxiliary chamber connected to the combustion chamber, the auxiliary chamber is used to receive secondary air, the minimum flow area of ​​the auxiliary chamber is the first area, the sum of the flow areas of all the air inlets 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%, and the second area ratio is less than or equal to the sum of the primary air ratio and 5%.

[0017] In one embodiment, the primary air accounts for 50% to 70%.

[0018] In one embodiment, the fire bar comprises:

[0019] an air collector, wherein the first receiving cavity is formed in the air collector;

[0020] a fuel collector, at least partially located in the combustion chamber, the fuel collector and the combustion chamber enclosing the combustion chamber, the combustion collector being connected to the air collector, and the fuel collector forming a second receiving chamber; and

[0021] A communicating vessel is connected to the fuel collector, the communicating vessel is at least partially located in the second receiving cavity, and the air supply cavity and the mixing hole group are formed in the communicating vessel.

[0022] In one embodiment, there are multiple communicating vessels, and the multiple communicating vessels are arranged at intervals along the length direction of the fire bar. The fuel collector has a surrounding wall that encloses the second receiving cavity, and the surrounding wall includes a first wall and a second wall that are arranged opposite to each other. The arrangement direction of the first wall and the second wall is arranged crosswise with the length direction of the fire bar. At least one of all the communicating vessels is a first communicating vessel, which is connected to the first wall and spaced apart from the second wall. At least one of all the communicating vessels is a second communicating vessel, which is connected to the second wall and spaced apart from the first wall. The first communicating vessel and the second communicating vessel are alternately arranged along the length direction of the fire bar. When projected along the length direction of the fire bar, the projection area of ​​the first communicating vessel partially overlaps with the projection area of ​​the second communicating vessel.

[0023] In one embodiment, the fuel collector comprises:

[0024] a first mounting portion, mounted on the combustion chamber, the first mounting portion penetrating a side wall of the combustion chamber, the first mounting portion forming a fuel input cavity communicating with the second receiving cavity; and

[0025] The second mounting portion is connected to the first mounting portion, the second mounting portion is located in the combustion chamber, and the second receiving cavity is formed in the second mounting portion.

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

[0027] Any of the above combustion devices;

[0028] a heat exchanger located at one end of the combustion chamber to receive heat released from the combustion chamber 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 combustion chamber.

[0030] In the combustion device of the embodiment of the present application, one of the first receiving chamber and the mixing hole is used to provide primary air to the air supply chamber, and the other of the first receiving chamber and the mixing hole is used to provide fuel to the air supply chamber. The fuel and primary air mix within the air supply chamber to form a fuel-air mixture, which then flows into the combustion chamber to burn and form a flame. Because the flow paths from two adjacent mixing hole groups to their corresponding air outlets along the length of the fire bar are unequal in length, the uniformity of the fuel-air mixtures corresponding to the two adjacent mixing hole groups may vary. This results in different natural frequencies of flames at adjacent locations along the length of the fire bar, reducing the possibility of resonance and the formation of thermoacoustic oscillations. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the structure of the combustion device according to an embodiment of the present application. In the figure, each fire bar has multiple communicating vessels, and each communicating vessel is provided with an air supply cavity;

[0032] Figure 2 for Figure 1 A schematic diagram of the structure shown at another viewing angle;

[0033] Figure 3 This is a schematic diagram of the bottom of a combustion device according to an embodiment of the present application. In the figure, each fire bar has multiple communicating vessels, and each communicating vessel is provided with an air supply cavity.

[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 diagram of the structure of the fire bar of an embodiment of the present application. The top wall of the fire bar is not shown in the figure. The fire bar in the figure has multiple communicating vessels, each of which is provided with an air supply cavity;

[0038] Figure 8 for Figure 5 A three-dimensional diagram of the communicating vessel shown;

[0039] Figure 9 This is a schematic structural diagram of an air collector according to an embodiment of the present application;

[0040] Figure 10 This is a schematic structural diagram of a combustion device according to an embodiment of the present application. In the figure, each fire bar is provided with a communicating vessel, and each communicating vessel is provided with an air supply cavity.

[0041] Figure 11 for Figure 10 Cross-sectional view at the middle position DD;

[0042] Figure 12 for Figure 10 A perspective view of the fire bar structure, showing the top wall of the fire bar;

[0043] Figure 13 for Figure 10 The three-dimensional view of the fire bar structure is shown, and the top wall of the fire bar is not shown in the figure.

[0044] Explanation of the accompanying drawings: combustion chamber 1; fire bar 2; first receiving chamber 21; air collecting port 211; transition port 212; air supply chamber 22; air inlet 221; air outlet 222; mixing hole group 23; first mixing hole group 23a; second mixing hole group 23b; third mixing hole group 23c; fourth mixing hole group 23d; mixing hole 231; second receiving chamber 24; air collector 25; fuel collector 26; surrounding wall 261; first wall 2611; second wall 2612; fourth wall 2613; top wall 2614; first mounting portion 262; fuel input chamber 2621; second mounting portion 263; communicating vessel 27; first communicating vessel 27a; second communicating vessel 27b; chamber wall 271; third wall 2711; combustion chamber 3; auxiliary chamber 4. DETAILED DESCRIPTION

[0045] 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.

[0046] 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 and Figure 11 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 and Figure 11 , the up and down directions are the directions indicated by arrow R1 in the figure.

[0047] It should be noted that, in the embodiments of the present application, the operator “*” refers to multiplication in mathematics.

[0048] 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 combustion device of the gas water heater generates thermoacoustic oscillations in the related art, and obtain the technical solution of the embodiments of this application through reasonable analysis.

[0049] In related art, the natural frequencies of the flames generated by the combustion devices of gas water heaters during combustion are relatively similar. It should be noted that the natural frequency of a flame refers to the frequency at which the heat released by the combustion of the fuel-air mixture forms a flame. This close proximity of the natural frequencies of the flames can cause resonance during combustion, generating thermoacoustic oscillations.

[0050] In view of this, an embodiment of the present application provides a gas water heater, which includes a combustion device, a heat exchanger, and a fan. The combustion device burns fuel to release heat to heat water in the heat exchanger. The fan is used to provide air required for combustion in the combustion device.

[0051] The combustion device of the embodiment of this application is shown in FIG. Figures 1 to 4 , Figure 10 as well as Figure 11 , comprising a combustion chamber 1 and a fire grate 2. The fire grate 2 is at least partially located in the combustion chamber 1, and the fire grate 2 and the combustion chamber 1 enclose a combustion chamber 3.

[0052] 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 grate 2 to the combustion chamber 3 for combustion.

[0053] In one embodiment, please refer to Figures 1 to 4 There is at least one fire bar 2, and each fire bar 2 is formed with a first receiving chamber 21, an air supply chamber 22 and a mixing hole group 23. The air supply chamber 22 and the mixing hole group 23 are both located between the first receiving chamber 21 and the combustion chamber 3, and the air supply chamber 22 is communicated with the first receiving chamber 21 and the combustion chamber 3 respectively. There are multiple mixing hole groups 23 corresponding to each fire bar 2, and each mixing hole group 23 includes at least one mixing hole 231. The mixing hole 231 is communicated with the air supply chamber 22, and the opening of one end of the air supply chamber 22 toward the combustion chamber 3 is an air outlet 222. Along the length direction of the fire bar 2, the lengths of the flow paths from two adjacent mixing hole groups 23 to the corresponding air outlets 222 are not equal. With this structure, one of the first receiving cavity 21 and the mixing hole 231 is used to supply primary air to the air supply cavity 22, and the other of the first receiving cavity 21 and the mixing hole 231 is used to supply fuel to the air supply cavity 22. The fuel and primary air mix within the air supply cavity 22 to form a fuel-air mixture, which then flows to the combustion cavity 3 to burn and form a flame. Because the flow paths from two adjacent mixing hole groups 23 to their corresponding air outlets 222 along the length of the fire bar 2 are unequal in length, the uniformity of the fuel-air mixtures corresponding to the two adjacent mixing hole groups 23 may vary. This results in different natural frequencies of flames at adjacent locations along the length of the fire bar 2, reducing the possibility of resonance and thermoacoustic oscillation.

[0054] It should be noted that the natural frequency of a flame refers to the frequency at which heat is released when a fuel-air mixture burns to form a flame.

[0055] It should be noted that primary air refers to air that is pre-mixed with fuel to form a fuel-air mixture, and the fuel-air mixture flows into the combustion chamber 3 for combustion.

[0056] It should be noted that the length of the flow path from the mixing hole group 23 to the corresponding air outlet 222 is the length of the flow path from the mixing hole 231 in the mixing hole group 23 to the corresponding air outlet 222 .

[0057] In one embodiment, please refer to Figure 8 and Figure 11 The lengths of the flow paths from all mixing holes 231 in each mixing hole group 23 to the corresponding air outlet 222 are equal, and the length of the flow path from each mixing hole group 23 to the air outlet 222 is the same as the length of the flow path from the corresponding mixing hole 231 to the corresponding air outlet 222. This structure allows the natural frequencies of flames within a certain range to be close, preventing the natural frequencies of the flames from changing too frequently to a certain extent.

[0058] It can be understood that when the number of mixing holes 231 in each mixing hole group 23 is one, the lengths of the flow paths from all mixing holes 231 in each mixing hole group 23 to the corresponding air outlet 222 are the lengths of the flow paths from this one mixing hole 231 to the corresponding air outlet 222, which belongs to the situation where the distances from all mixing holes 231 to the corresponding air outlet 222 in each mixing hole group 23 are equal as mentioned in the embodiment of the present application.

[0059] In one embodiment, the lengths of the flow paths from all mixing holes 231 to the corresponding air outlets 222 in each mixing hole group 23 may not be equal. The length of the flow path from each mixing hole group 23 to the air outlet 222 is the average length of the flow paths from all mixing holes 231 in each mixing hole group 23 to the corresponding air outlet 222.

[0060] It should be noted that the flow path is the path through which the airflow flows, and the flow path should be understood as the path through which the airflow flows as a whole on a macro scale. For example, the airflow within the air supply chamber 22 flows toward the combustion chamber 23. On a macro scale, the airflow flows toward the combustion chamber 23 as a whole along the central axis of the air supply chamber 22. The flow path of the airflow within the air supply chamber 22 is the path along which the airflow flows along the central axis of the air supply chamber 22. When the central axis of the air supply chamber 22 is a straight line, the flow path length from the mixing hole 231 to the corresponding air outlet 222 is the distance from the mixing hole 231 to the corresponding air outlet 222.

[0061] It should be explained that the starting position of the flow path from the mixing hole 231 to the corresponding air outlet 222 is the position where the central axis of the mixing hole 231 intersects the central axis of the air supply cavity 22 .

[0062] It should be noted that the fuel-air mixture formed by the fuel and primary air entering the air supply chamber 22 through the mixing hole group 23 is primarily located between the mixing hole group 23 and the opening at the end of the air supply chamber 22 facing the combustion chamber 3. The primary air located between the air inlet 221 and the mixing hole group 23 has not yet mixed with the fuel. After this portion of primary air enters the air supply chamber 22 through the air inlet 221, the air supply chamber 22 has a certain rectifying effect on this portion of primary air, causing it to flow as close to parallel flow as possible overall. This can reduce energy loss caused by disordered airflow disturbances and help maintain a relatively high flow rate of the primary air.

[0063] In one embodiment, the first receiving chamber 21 can be used to receive primary air, and the primary air in the first receiving chamber 21 flows to the air supply chamber 22 to provide primary air to the air supply chamber 22. The mixing hole 231 of the mixing hole group 23 can be used to provide fuel to the air supply chamber 22. The fuel and the primary air are mixed in the air supply chamber to form a fuel-air mixture.

[0064] In one embodiment, the first receiving chamber 21 can be used to receive fuel, and the fuel in the first receiving chamber 21 flows to the air supply chamber 22 to provide fuel to the air supply chamber 22. The mixing hole 231 of the mixing hole group 23 can be used to provide primary air to the air supply chamber 22. The fuel and the primary air are mixed in the air supply chamber to form a fuel-air mixture.

[0065] In one embodiment, the fuel may be natural gas.

[0066] In one embodiment, the fuel may be hydrogen or hydrogen-rich synthetic gas.

[0067] In one embodiment, please refer to Figure 4 and Figure 11 The first receiving chamber 21 is located at one end of the air supply chamber 22 , and the combustion chamber 3 is located at the other end of the air supply chamber 22 .

[0068] In one embodiment, please refer to Figure 4 and Figure 11 The first receiving chamber 21 is located at the lower end of the air supply chamber 22, and the combustion chamber 3 is located at the upper end of the air supply chamber 22.

[0069] In one embodiment, please refer to Figures 4 to 7 , Figure 10 as well as Figure 11 The length direction of the fire bar 2 is the direction indicated by the arrow R2 in the figure.

[0070] In one embodiment, the heat exchanger is located at one end of the combustion chamber 1 to receive heat released from the combustion chamber 1 to heat water in the heat exchanger.

[0071] In one embodiment, the heat exchanger is located above the combustion chamber 1 .

[0072] In one embodiment, the fan is used to provide power to the primary air so that the primary air flows toward the combustion chamber 3 , thereby providing the combustion chamber 3 with air required for combustion.

[0073] In one embodiment, the fan may be an induced draft fan capable of forming negative pressure. The induced draft fan is located downstream of the fire bar 2 , and the primary air is sucked into the combustion chamber 3 through the first receiving chamber 21 and the air supply chamber 22 .

[0074] In one embodiment, the fan may be a blower capable of forming positive pressure. The blower is located upstream of the fire bar 2 , and the primary air is blown into the combustion chamber 3 through the first receiving chamber 21 and the air supply chamber 22 .

[0075] In one embodiment, the number of fire bars 2 can be selected according to actual needs, and the number of fire bars 2 is at least one. For example, the number of fire bars 2 can be one, two, five, seven, or eight.

[0076] In one embodiment, please refer to Figure 4 as well as Figure 5 Among the two adjacent mixing hole groups 23 along the length direction of the fire bar 2, one mixing hole group 23 is the first mixing hole group 23a, and the other mixing hole group 23 is the second mixing hole group 23b. The length of the flow path from the first mixing hole group 23a to the corresponding air outlet 222 and the length of the flow path from the second mixing hole group 23b to the corresponding air outlet 222 are not equal. The first mixing hole group 23a and the second mixing hole group 23b are alternately arranged along the length direction of the fire bar 2. With such a structural form, the length of the flow path from the mixing hole group 23 to the corresponding air outlet 222 is arranged alternately, one long and one short. On the one hand, the natural frequencies of adjacent flames are different, which reduces the possibility of thermoacoustic oscillation and the noise generated by combustion. On the other hand, in the shorter flow path, the primary air and fuel do not have time to be fully mixed, and the fuel concentration at some positions is higher, which is conducive to stable combustion of the flame. The fuel-air mixture corresponding to the shorter flow path burns to form a relatively stable on-duty flame. The longer flow path allows the fuel and primary air to be mixed more evenly, and the fuel can be burned as fully as possible, so that the fuel is diluted after mixing. A high primary air content and a fast flow rate of the fuel-air mixture may cause the flame to go out. The first mixing hole group 23a and the second mixing hole group 23b are arranged alternately. Even if some of its flames burn unstable and go out, the on-duty flame can re-ignite the fuel-air mixture at the extinguished position.

[0077] In one embodiment, please refer to Figure 5 The length of the flow path from the mixing holes 231 in the first mixing hole group 23a to the corresponding air outlet 222 is D1. The length of the flow path from the mixing holes 231 in the second mixing hole group 23b to the corresponding air outlet 222 is D2. D1 and D2 are not equal, where D2>D1.

[0078] In one embodiment, the lengths of the flow paths from all the mixing holes 231 in each first mixing hole group 23 a to the corresponding air outlet 222 are equal.

[0079] In one embodiment, the lengths of the flow paths from all the mixing holes 231 in each second mixing hole group 23 b to the corresponding air outlet 222 are equal.

[0080] In one embodiment, please refer to Figure 8 , the figure shows the arrangement of the mixing holes 231 of the mixing hole group 23 on the communicating vessel 27.

[0081] In one embodiment, please refer to Figures 1 to 7 , the number of air supply cavities 22 corresponding to each fire bar 2 is multiple.

[0082] In one embodiment, please refer to Figures 3 to 7 Multiple air supply cavities 22 are spaced apart along the length of the fire bar 2, each corresponding to a mixing hole group 23. This structure allows each air supply cavity 22 to form independent flames. These numerous independent flames create a more uniform temperature distribution within the combustion chamber 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.

[0083] In one embodiment, please refer to Figure 4 and Figure 5 When multiple air supply cavities 22 are spaced apart along the length of the fire bar 2, each corresponding to a mixing hole group 23, with the first mixing hole groups 23a and the second mixing hole groups 23b arranged alternately, multiple service flames can be formed. When the fuel-air mixture in the air supply cavities 22 on either side of the service flame extinguishes, the service flame can reignite the fuel-air mixture on both sides.

[0084] In one embodiment, please refer to Figures 10 to 13 Along the length direction of the fire bar 2, the length of the flow path from the mixing hole group 23 to the corresponding air outlet 222 changes periodically. The length of the flow path from the mixing hole group 23 to the corresponding air outlet 222 first increases and then decreases, or first decreases and then increases within a cycle. Such a structural form allows the natural frequency of the flame to have more changes within a cycle, which can effectively reduce the possibility of resonance and thermoacoustic oscillation. Furthermore, the length of the flow path from the mixing hole group 23 to the air outlet 222 first increases and then decreases, or first decreases and then increases within a cycle, so that the length of the flow path from the mixing hole group 23 to the air outlet 222 will not increase or decrease continuously. The length of the flow path from the mixing hole group 23 to the air outlet 222 can be maintained within a relatively suitable range during the periodic and continuous changes.

[0085] In one embodiment, please refer to Figures 10 to 13 The length direction of the air supply cavity 22 is arranged along the length direction of the fire bar 22. Along the length direction of the fire bar 2, the length of the flow path from the mixing hole group 23 to the corresponding air outlet 222 changes periodically. The length of the flow path from the mixing hole group 23 to the corresponding air outlet 222 first increases and then decreases, or first decreases and then increases within a cycle.

[0086] In one embodiment, please refer to Figures 10 to 13 , the number of the air supply cavity can be one.

[0087] In one embodiment, please refer to Figures 10 to 13 When there is only one air supply cavity, the length direction of the air supply cavity 22 is arranged along the length direction of the fire bar 22. Along the length direction of the fire bar 2, the length of the flow path from the mixing hole group 23 to the corresponding air outlet 222 changes periodically. The length of the flow path from the mixing hole group 23 to the corresponding air outlet 222 increases first and then decreases, or decreases first and then increases within a cycle.

[0088] It can be understood that, along the length direction of the fire bar 2 , the length of the flow path from the mixing hole group 23 to the corresponding air outlet 222 changes periodically, which is applicable to the situation of multiple air supply cavities 22 .

[0089] In one embodiment, the first receiving chamber 21 is used to receive primary air, and the mixing hole 231 is used to supply fuel to the air supply chamber 22. Thus, the primary air received by the first receiving chamber 21 flows into the air supply chamber 22 to provide primary air to the air supply chamber 22, and the fuel flows into the air supply chamber 22 through the mixing hole 231. The primary air and fuel mix in the air supply chamber 22 to form a fuel-air mixture.

[0090] In one embodiment, please refer to Figures 10 to 13Each fire bar 2 corresponds to at least one air supply cavity 22, and each air supply cavity 22 is provided with a mixing hole group 23 on opposite sides. The mixing holes 231 of the mixing hole groups 23 on both sides are arranged oppositely, and the relative arrangement direction of the mixing holes 231 on both sides is arranged crosswise with the length direction of the fire bar 2. With such a structural form, when the mixing holes 231 are used to supply fuel to the air supply cavity 23, the relatively arranged mixing holes 231 cause the two streams of fuel to collide in the air supply cavity 22 through the mixing holes 231 when the fuel flow rate is large and the flow rate is fast, reducing the possibility of the fuel being sprayed into the air supply cavity 231 through the mixing holes 231 and adhering to the inner wall of the air supply cavity 231. To a certain extent, it can prevent the flame from propagating into the air supply cavity 22 along the fuel adhering to the inner wall of the air supply cavity 231, thereby reducing the risk of backfire. Furthermore, when the fuel flow rate flowing through the mixing holes 231 of the mixing hole group 23 is large and the flow rate is fast, the fuel flowing through the mixing holes 231 symmetrically arranged on both sides collides with each other, so that the fuel and the primary air are fully mixed, and the fuel and the primary air are mixed more evenly. The flame temperature formed by the combustion of the fuel-air mixture formed by the mixture of the fuel and the primary air is more uniform, which can reduce the thermal nitrogen oxides generated by local high temperature.

[0091] In one embodiment, please refer to Figures 11 to 13 The mixing holes 231 of the mixing hole groups 23 on both sides are arranged symmetrically. In this way, the momentum of the two fuel streams colliding through the mixing holes 231 on both sides is relatively close, which is conducive to the two fuel streams colliding near the symmetry center, reducing the possibility of fuel adhering to the inner wall of the air supply cavity 22 and reducing the risk of flashback.

[0092] In one embodiment, please refer to Figures 10 to 13 The arrangement direction of the mixing holes 231 of the mixing hole groups 23 on both sides is the first direction.

[0093] In one embodiment, please refer to Figures 10 to 13 , the first direction is the direction indicated by arrow R3 in the figure.

[0094] In one embodiment, when the mixing holes 231 of the mixing hole groups 23 on both sides are arranged opposite to each other, the number of the air supply cavities 22 can also be multiple, and the arrangement direction of the multiple air supply cavities 22 is arranged to intersect with the first direction.

[0095] In one embodiment, the arrangement direction of the plurality of air supply cavities 22 is perpendicular to the first direction.

[0096] In one embodiment, please refer to Figures 10 to 13 There are multiple mixing hole groups 23 on each side, and the multiple mixing hole groups 23 on each side are arranged along the length direction of the fire bar 2.

[0097] In one embodiment, the length direction of the fire bar 2 is perpendicular to the first direction.

[0098] In one embodiment, please refer to Figures 10 to 13The lengths of the flow paths from all mixing holes 231 in each mixing hole group 23 to the corresponding air outlet 222 are equal, and the length of the flow path from each mixing hole group 23 to the air outlet 222 is the length of the flow path from the corresponding mixing hole 231 to the corresponding air outlet 222. Along the length direction of the fire bar 2, among all the mixing hole groups 23 corresponding to each fire bar 2, the mixing hole group 23 located at one end of the air supply cavity 22 is the third mixing hole group 23c, and the length of the flow path from the third mixing hole group 23c to the corresponding air outlet 222 is the third distance; the mixing hole group 23 located at the other end of the air supply cavity 22 is the fourth mixing hole group 23d, and the length of the flow path from the fourth mixing hole group 23d to the corresponding air outlet 222 is the fourth distance; the remaining mixing hole groups 23 are all located between the third mixing hole group 23c and the fourth mixing hole group 23d, and the length of the flow path from the remaining mixing hole groups 23 to the corresponding air outlet 222 is greater than or equal to the larger of the third distance and the fourth distance. With such a structural form, the fuel entering the air supply chamber 22 through the mixing holes 231 of the third mixing hole group 23c and the mixing holes 231 of the fourth mixing hole group 23d is mixed with the primary air in the air supply chamber 22 to form a fuel-air mixture. Since the length of the flow path from the third mixing hole group 23c and the fourth mixing hole group 23d to the corresponding air outlet 222 is relatively short, the local fuel concentration in the fuel-air mixture is relatively large, and a relatively stable duty flame can be formed at both ends of the air supply chamber 22 along the length direction of the fire bar 2. Even if the size of the air supply chamber 22 along the length direction of the fire bar 2 is relatively long, the duty flames at both ends of the air supply chamber 22 along the length direction of the fire bar 2 can gradually ignite the fuel-air mixture toward the middle position of the air supply chamber 22 along the length direction of the fire bar 2, thereby ensuring as much as possible that the flame of the entire air outlet 222 of the air supply chamber 22 does not go out or is quickly ignited again after being extinguished.

[0099] In one embodiment, the number of mixing holes 231 in each mixing hole group 23 can be one or more. Figure 11 , the number of mixing holes 231 in each mixing hole group 23 is two. In other embodiments, the number of mixing holes 231 in each mixing hole group 23 can be three, six or more.

[0100] It can be understood that the length of the flow path from the remaining mixing hole groups 23 to the corresponding air outlet 222 is greater than or equal to the larger of the third distance and the fourth distance, which means that when the third distance is greater than the fourth distance, the length of the flow path from the remaining mixing hole groups 23 to the corresponding air outlet 222 is greater than or equal to the third distance, and when the fourth distance is greater than the third distance, the length of the flow path from the remaining mixing hole groups 23 to the corresponding air outlet 222 is greater than or equal to the fourth distance.

[0101] In one embodiment, the third distance can be equal to the fourth distance. In this way, the third mixing hole group 23c and the fourth mixing hole group 23d can be as close as possible to the corresponding air outlet 222, so that the air supply cavity 22 can form a watch flame with roughly the same degree of stability at both ends of the fire bar 2 along the length direction.

[0102] It should be noted that when the third distance can be equal to the fourth distance, the distance from the remaining mixing hole groups 23 to the corresponding air outlet 222 is greater than or equal to the larger of the third distance and the fourth distance. It should be understood that the distance from the remaining mixing hole groups 23 to the corresponding air outlet 222 is greater than or equal to either the third distance or the fourth distance.

[0103] In one embodiment, the opening at the end of the first receiving chamber 21 facing away from the air supply chamber 22 is the air collecting port 211, and the opening at the end of the air supply chamber 22 facing the first receiving chamber 21 is the air inlet 221. The sum of the flow areas of all the air collecting ports 211 is greater than the sum of the flow areas of all the air inlets 221. With such a structure, on the one hand, when the primary air flows to the air supply chamber 22 through the air collecting port 211 and the air inlet 221 to mix with the fuel, since the sum of the flow areas of all the air collecting ports 211 is greater than the sum of the flow areas of all the air inlets 221, the speed of the primary air will increase after flowing from the air collecting port 211 through the air inlet 221 to the air supply chamber 22. The faster primary air mixes with the fuel in the air supply chamber 22 to form a fuel-air mixture with a faster speed, thereby alleviating the backfire phenomenon caused by the low flow rate of the fuel-air mixture. On the other hand, primary air enters the air supply chamber 22 through the first receiving chamber 21, and the fuel mixing hole 231 enters the air supply chamber 22. The mixing hole group 23 is located between the combustion chamber 3 and the first receiving chamber 21. The fuel and primary air enter the fire grate 2 through different channels and mix in the air supply chamber 22. Compared with the fuel and primary air entering the fire grate 2 together, the fuel-air mixture flows along a shorter path to the combustion chamber 3, alleviating the flashback phenomenon caused by the fuel adhering to the wall of the air supply chamber 22 during the longer flow path. Therefore, the combustion device of the embodiment of the present application can effectively alleviate the flashback phenomenon of the fuel burning in the combustion device and reduce the risk of flashback.

[0104] It can be understood that the flow area is the area of ​​the flow section.

[0105] It is understandable that when there is only one gas collecting port 211 , the sum of the flow areas of all the gas collecting ports 211 is the flow area of ​​this one gas collecting port 211 .

[0106] It is understandable that when there is only one air inlet 221 , the sum of the flow areas of all the air inlets 221 is the flow area of ​​this one air inlet 221 .

[0107] In one embodiment, please refer to Figure 4The flow area of ​​the gas collecting port 211 is the area of ​​the region surrounded by the gas collecting port 211 on the plane where the gas collecting port 211 is located.

[0108] In one embodiment, the flow area of ​​the air inlet 221 is the area of ​​a region enclosed by the air inlet 221 on the plane where the air inlet 221 is located.

[0109] In one embodiment, please refer to Figure 4 、 Figure 5 、 Figure 11 as well as Figure 13 Each fire bar 2 is also formed with a second receiving chamber 24, and the mixing hole 231 is respectively connected to the second receiving chamber 24 and the air supply chamber 22. The first receiving chamber 21 is used to receive primary air, and the air supply chamber 22 is used to receive the primary air of the first receiving chamber 21 and to receive the fuel in the second receiving chamber 24 through the mixing hole 231.

[0110] In one embodiment, please refer to Figure 4 、 Figure 5 as well as Figure 11 The second receiving chamber 24 is located between the first receiving chamber 21 and the combustion chamber 3 , and the air supply chamber 22 is at least partially located in the second receiving chamber 24 .

[0111] In one embodiment, please refer to Figure 4 and Figure 5 , the air supply cavity 22 passes through the second receiving cavity 24 .

[0112] In one embodiment, please refer to Figure 4 、 Figure 5 ,as well as Figures 11 to 13 The mixing hole group 23 is located in the second receiving cavity 24 .

[0113] In one embodiment, please refer to Figure 4 、 Figure 5 、 Figure 8 ,as well as Figures 10 to 13 , the air supply cavity 22 has a columnar structure.

[0114] In one embodiment, the air supply cavity 22 has a columnar structure, and the flow cross section is a cross section perpendicular to the axial direction of the air supply cavity 22 .

[0115] In one embodiment, please refer to Figure 4 、 Figure 5 、 Figure 8 ,as well as Figures 10 to 13 The air supply cavity 22 is a columnar structure with a rectangular flow cross section, that is, the air supply cavity 22 is a rectangular parallelepiped.

[0116] In one embodiment, please refer to Figure 4 、 Figure 5 、 Figure 8 ,as well as Figures 10 to 13The air supply cavity 22 is a columnar structure with a rectangular flow cross section, and the flow area of ​​the air inlet 221 is a rectangular area.

[0117] In one embodiment, the flow cross-section of the air supply cavity 22 is not limited to a rectangle, and may also be a rectangle, a diamond, a circle, a hexagon, or the like.

[0118] In one embodiment, please refer to Figure 5 ,as well as Figures 11 to 13 The axial direction of the mixing holes 231 of the mixing hole group 23 is perpendicular to the axial direction of the air supply cavity 22 .

[0119] In one embodiment, please refer to Figure 4 、 Figure 9 and Figure 11 , along the direction from the first receiving cavity 21 to the air supply cavity 22 , the flow area of ​​the first receiving cavity 21 gradually decreases.

[0120] In one embodiment, please refer to Figure 4 、 Figure 9 and Figure 11 The direction from the first receiving cavity 21 to the air supply cavity 22 is from bottom to top.

[0121] In one embodiment, the flow cross-section of the air supply cavity 22 is a target cross-section.

[0122] It should be noted that the flow cross section refers to the flow cross section, and the flow area refers to the area of ​​the flow cross section.

[0123] In one embodiment, please refer to Figure 7 and Figure 8 , the air supply cavity 22 has a characteristic size.

[0124] In one embodiment, the characteristic dimension may be the hydraulic diameter of the air supply cavity 22 .

[0125] It should be explained that the hydraulic diameter is 4 times the ratio of the flow area to the perimeter. Specifically, the hydraulic diameter of the air supply cavity 22 is 4 times the ratio of the flow area of ​​the air supply cavity 22 to the perimeter of the flow cross section of the air supply cavity 22.

[0126] It should be noted that the hydraulic diameter is roughly equivalent to the characteristic size. Especially when the flow cross-section of the air supply cavity 22 has an irregular shape, the characteristic size is difficult to define clearly, and the hydraulic diameter can be used as the characteristic size.

[0127] In one embodiment, when the flow cross-section of the air supply cavity 22 is a target cross-section, the characteristic dimension is the minimum span on the target cross-section through the geometric center of the target cross-section.

[0128] In one embodiment, please refer to Figure 7 and Figure 8The target cross section is in the shape of a long strip, the two relatively long sides of the target cross section are parallel, and the minimum span through the geometric center of the target cross section on the target cross section is the distance between the two relatively long sides of the target cross section.

[0129] In one embodiment, please refer to Figure 7 and Figure 8 The long strip can be a rectangle, and the minimum span through the geometric center of the target section on the target section is equal to the width of the rectangle.

[0130] In one embodiment, the long strip shape may be a waist shape, and the minimum span on the target cross section through the geometric center of the target cross section is the distance between two oppositely arranged long sides of the target cross section.

[0131] In one embodiment, the target cross section may be elliptical, and the minimum span of the target cross section through the geometric center of the target cross section is equal to the length of the minor axis of the ellipse.

[0132] It is understandable that the shape of the target cross section is not limited to the above shapes and can be selected according to actual needs.

[0133] In one embodiment, please refer to Figure 5 、 Figure 8 as well as Figure 11 The length of the flow path from the mixing hole 231 to the corresponding air outlet 222 is greater than or equal to the characteristic dimension, and the length of the flow path from the mixing hole 231 to the corresponding air outlet 222 is less than or equal to ten times the characteristic dimension. With this structure, the length of the flow path from the mixing hole 231 to the air outlet 222 is more appropriate. On the one hand, it can alleviate the problem of uneven mixing of the fuel-air mixture due to a short mixing distance, resulting in incomplete fuel combustion. On the other hand, it can alleviate the problem of a long mixing distance of the fuel-air mixture, which can cause fuel (e.g., hydrogen) to adhere to the wall surface of the air supply chamber 22 during the long-distance flow of the fuel-air mixture to the combustion chamber 3, and thus cause backfire.

[0134] In one embodiment, please refer to Figure 7 and Figure 8 , the characteristic dimension shown in the figure is L, the distance from the geometric center of the mixing hole 231 to the corresponding air outlet 222 is greater than or equal to L, and the distance from the geometric center of the mixing hole 231 to the corresponding air outlet 222 is less than or equal to 10L. Exemplarily, the distance from the geometric center of the mixing hole 231 to the corresponding air outlet 222 can be L, 2L, 3L, 5.5L, 6.5L, 8L, or 10L.

[0135] In one embodiment, the distance from the geometric center of the mixing hole 231 to the corresponding air outlet 222 may be set to be smaller than the characteristic size or greater than ten times the characteristic size according to actual needs.

[0136] In one embodiment, please refer to Figure 5 A corresponding mixing hole group 23 is provided between each air supply cavity 22 and the second receiving cavity 24 .

[0137] In one embodiment, please refer to Figure 3 、 Figure 4 as well as Figure 6 The flow area of ​​the first receiving chamber 21 gradually decreases as it points toward the air supply chamber 22. The opening at one end of the first receiving chamber 21 facing the air supply chamber 22 forms a transition opening 212. Projected along the alignment of the first receiving chamber 21 and the air supply chamber 22, the projected area of ​​the air inlet 221 lies within the projected area of ​​the transition opening 212. With this structure, the flow area of ​​the first receiving chamber 21 gradually decreases as it points toward the air supply chamber 22, and the flow area of ​​the first receiving chamber 21 is minimized at the transition opening 212. Because the projected area of ​​the air inlet 221 lies within the projected area of ​​the transition opening 212, the sum of the flow areas of all the air inlets 221 is smaller than the flow area of ​​the first receiving chamber 21 at the transition opening 212. The flow rate of the primary air entering the air supply chamber 22 is significantly affected by the air inlets 221. By adjusting the relationship between the flow area of ​​the air inlet 221 and the cross-sectional area of ​​the mixing hole 231, the degree of uniform mixing of the fuel and primary air can be adjusted. The proportion of primary air can also be adjusted by setting the flow area of ​​the air inlet 221.

[0138] In one embodiment, the sum of the flow areas of all the air inlets 221 is greater than or equal to five times the sum of the cross-sectional areas of all the mixing holes 231, and the sum of the flow areas of all the air inlets 221 is less than or equal to ten times the sum of the cross-sectional areas of all the mixing holes 231. With this structure, the momentum of the primary air entering the air supply chamber 22 through the air inlets 211 and the momentum of the fuel entering the air supply chamber 22 through the mixing holes 231 are relatively appropriate. The fuel entering the air supply chamber 22 through the mixing holes 231 can be sprayed as close to the central axis of the air supply chamber 22 as possible to mix with the primary air, thereby ensuring that the fuel-air mixture in the air supply chamber 22 is more fully and evenly mixed. Furthermore, when there is sufficient primary air, the relationship between the flow area of ​​the air inlet 221 and the flow area of ​​the mixing hole 231 results in a fuel-air mixture formed by the primary air entering the air supply chamber 22 through the air inlet 221 and the fuel entering the air supply chamber 22 through the mixing hole 231, which contains a relatively high amount of primary air. The fuel-air mixture flows into the combustion chamber 3 for combustion in a lean burn state, and the flame formed by the combustion is relatively short. This can correspondingly reduce the height of the side wall of the combustion chamber 1, reduce the space occupied by the combustion device, and reduce costs. When the fuel-air mixture is in a lean burn state, the bottom of the flame formed will be lifted a distance away from the air outlet 222, preventing the flame from burning close to the fire grate 2 at the air outlet 222 of the air supply chamber 22, causing the local temperature of the fire grate 2 to be too high.

[0139] In one embodiment, the sum of the flow areas of all the air inlets is S1, the sum of the cross-sectional areas of all the mixing holes 231 is S2, and 5*S2≤S1≤10*S2.

[0140] In one embodiment, please refer to Figure 4 and Figure 11 There are multiple fire bars 2, arranged at intervals. The multiple fire bars 2 and the combustion chamber 1 enclose an auxiliary chamber 4 that communicates with the combustion chamber 3. The auxiliary chamber 4 is used to receive secondary air. With this structure, secondary air enters the combustion chamber 3 through the auxiliary chamber 4. This not only helps to reburn incompletely burned fuel, but also cools the sidewalls of the combustion chamber 1 and the fire bars 2 at the air outlets 222, preventing the combustion chamber 1 and the fire bars 2 from overheating.

[0141] It should be noted that secondary air refers to air that flows into the combustion chamber 3 without being pre-mixed with fuel.

[0142] In one embodiment, please refer to Figure 4 and Figure 6 The minimum flow area of ​​the auxiliary chamber 4 is the first area, the sum of the flow areas of all air inlets 221 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 primary air to the sum of the volume of primary air and the volume of 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%. This structural form clarifies the relationship between the first and second areas and the primary air ratio, and the primary air ratio can be controlled by setting the first and second areas.

[0143] In one embodiment, the first area is S3, the second area is S4, the volume of the primary air is V1, the volume of the secondary air is V2, and V1 / V1+V2-5%≤S2 / S1+S2≤V1 / V1+V2+5%.

[0144] In one embodiment, the fan is further used to provide power to the secondary air so that the secondary air flows through the auxiliary chamber 4 to the combustion chamber 3 , thereby enabling the fan to provide secondary air to the combustion chamber 3 .

[0145] In one embodiment, the proportion of primary air is 50% to 70%. Thus, by setting the first area and the second area to ensure that the proportion of primary air is 50% to 70%, the amount of primary air received by the first receiving chamber 21 is relatively sufficient, which is conducive to keeping the fuel-air mixture in the combustion chamber 3 in a lean burn state.

[0146] In one embodiment, when the proportion of primary air is 50% to 70%, the proportion of secondary air is 30% to 50%.

[0147] In one embodiment, the minimum flow cross-section of the auxiliary chamber 4 is located in the plane where the gas collecting port 211 is located, and the minimum flow area of ​​the auxiliary chamber 4 is the area of ​​the minimum flow cross-section of the auxiliary chamber 4. With this structure, since the flow area of ​​the first receiving chamber 21 gradually decreases in the direction from the first receiving chamber 21 to the gas supply chamber 22, the flow area of ​​the first receiving chamber 21 is largest at the gas collecting port 211. The minimum flow cross-section of the auxiliary chamber 4 is located in the plane where the gas collecting port 211 is located, resulting in a smaller gap between adjacent fire bars 2 on the plane where the gas collecting port 211 is located, a smaller gap between the fire bars 2 and the side wall of the combustion chamber 1, and a larger outer contour of the fire bars 2 on the plane where the gas collecting port 211 is located, thereby forming a gas collecting port 211 with a larger flow area on the fire bars 2. The minimum flow cross-section of the auxiliary chamber 4 is located in the plane where the gas collecting port 211 is located. The flow area of ​​the auxiliary chamber 4 on the side of the gas collecting port 211 facing the combustion chamber 3 is larger than the minimum flow area of ​​the auxiliary chamber 4. The gaps between adjacent fire bars 2 on the plane where the corresponding flow cross-sections are located are larger, and the gaps between the fire bars 2 and the sidewalls of the combustion chamber 1 are larger, resulting in a corresponding reduction in the outer profile of the fire bars 2. The outer profile of the fire bars 2 is larger on the side facing the gas collecting port 211 and smaller on the side facing the combustion chamber 3. This not only adapts to changes in the flow area of ​​the first receiving chamber 21, but also saves materials and reduces costs.

[0148] In one embodiment, please refer to Figure 4 and Figure 11 The plane where the gas collecting port 211 is located is the plane P1 indicated by the dotted line in the figure.

[0149] In one embodiment, please refer to Figure 3 、 Figure 4 as well as Figure 6 The minimum flow cross section of the auxiliary chamber 4 is the cross section P2 indicated by the parallel oblique lines in the figure. It should be noted that for clarity, only a portion of the cross section P2 is shown in the figure, and the entire cross section P2 is not shown.

[0150] In one embodiment, please refer to Figure 4 、 Figure 5 、 Figure 7 ,as well as Figures 11 to 13The fire bar 2 includes an air collector 25, a fuel collector 26 and a manifold 27. The first receiving chamber 21 is formed in the air collector 25. The fuel collector 26 is at least partially located in the combustion chamber 1. The fuel collector 26 and the combustion chamber 1 are enclosed to form a combustion chamber 3. The combustion collector is connected to the air collector 25. The fuel collector 26 forms a second receiving chamber 24. The manifold 27 is connected to the fuel collector 26. The manifold 27 is at least partially located in the second receiving chamber 24. The air supply chamber 22 and the mixing hole group 23 are formed in the manifold 27. With such a structural form, the primary air is collected into the air supply chamber 22 of the manifold 27 through the air collector 25. The fuel in the second receiving chamber 24 of the fuel collector 26 enters the air supply chamber 22 of the manifold 27 through the mixing hole group 23 on the manifold 27 and mixes with the primary air in the air supply chamber 22 to form a fuel-air mixture. The fuel-air mixture flows out of the manifold 27 through the outlet 222 of the air supply chamber 22 and into the combustion chamber 3 formed by the fuel collector 26 and the combustion chamber 1, where it is burned. The air collector 25, fuel collector 26, and manifold 27 ensure the optimal arrangement of the first receiving chamber 21, the second receiving chamber 24, the air supply chamber 22, and the mixing hole group 23 on the corresponding components. The fuel collector 26 centrally supplies air, and the fuel is distributed to the corresponding air supply chambers 22 through the mixing holes 231.

[0151] In one embodiment, please refer to Figure 4 、 Figure 5 as well as Figure 11 The air collector 25 , the fuel collector 26 and the combustion chamber 1 are arranged to form an auxiliary chamber 4 .

[0152] In one embodiment, please refer to Figure 4 and Figure 11 , the air collector 25 is located in the combustion chamber 1.

[0153] In one embodiment, please refer to Figure 4 and Figure 11 The air collector 25 is located on the side of the fuel collector 26 facing away from the combustion chamber 3.

[0154] In one embodiment, please refer to Figure 4 and Figure 11 The combustion chamber 3 is located above the fuel collector 26 , and the air collector 25 is located below the fuel collector 26 .

[0155] In one embodiment, please refer to Figure 4 and Figure 5 The communicating vessel 27 passes through the fuel collector 26 .

[0156] In one embodiment, the air collector 25 can be detachably connected to, welded to, or integrally formed with the fuel collector 26 .

[0157] In one embodiment, the communicating vessel 27 may be detachably connected to, welded to, or integrally formed with the fuel collector 26 .

[0158] In one embodiment, please refer to Figures 1 to 7 The number of communicating vessels 27 of each fire bar 2 can be multiple.

[0159] In one embodiment, please refer to Figures 10 to 13 The number of communicating vessels 27 of each fire bar 2 can be one.

[0160] In one embodiment, please refer to Figure 7 , the top wall 2614 of the fuel collector 26 is not shown in the figure, and multiple communicating vessels 27 are arranged at intervals along the length direction of the fire bar 2. The fuel collector 26 has a surrounding wall 261 that encloses the second receiving cavity 24. The surrounding wall 261 includes a first wall 2611 and a second wall 2612 arranged opposite to each other. The arrangement direction of the first wall 2611 and the second wall 2612 is arranged to intersect with the length direction of the fire bar 2. At least one communicating vessel 27 among all the communicating vessels 27 is a first communicating vessel 27a, which is connected to the first wall 2611 and spaced apart from the second wall 2612. At least one communicating vessel 27 among all the communicating vessels 27 is a second communicating vessel 27b, which is connected to the second wall 2612 and spaced apart from the first wall 2611. The first communicating vessel 27a and the second communicating vessel 27b are alternately arranged along the length direction of the fire bar 2. When projected along the length direction of the fire bar 2, the projection area of ​​the first communicating vessel 27a partially overlaps with the projection area of ​​the second communicating vessel 27b. With such a structural form, the fuel in the second receiving chamber 24 can bypass between the first communicating vessel 27a and the second communicating vessel 27b. The fuel can almost pass through the other parts of the first communicating vessel 27a except the connection with the first wall 2611, which is conducive to the fuel entering the air supply chamber 22 of the first communicating vessel 27a through the mixing hole 231 on the first communicating vessel 27a. The fuel can almost pass through the other parts of the second communicating vessel 27b except the connection with the second wall 2612, which is conducive to the fuel entering the air supply chamber 22 of the second communicating vessel 27b through the mixing hole 231 on the second communicating vessel 27b.

[0161] Understandably, see Figure 7 When the fuel passes through the mixing hole 231 between the first communicating vessel 27a and the second communicating vessel 27b, part of the fuel enters the corresponding air supply cavity 22 through the mixing hole 231, and part of the fuel continues to pass between the first communicating vessel 27a and the second communicating vessel 27b.

[0162] In one embodiment, when projected along the length direction of the fire bar 2 , the area where the projection area of ​​the first communicating vessel 27 a overlaps with the projection area of ​​the second communicating vessel 27 b is the reference area.

[0163] In one embodiment, the projections of at least a portion of the mixing holes 231 corresponding to the first communicating vessel 27a and / or the second communicating vessel 27b are located within the reference area. With this structure, as the fuel circulates between the first communicating vessel 27a and the second communicating vessel 27b, it will inevitably pass through the location of the mixing holes 231 before flowing into the gap between the next first communicating vessel 27a and the second communicating vessel 27b. This facilitates the fuel's entry into the first communicating vessel 27a or the second communicating vessel 27b through the corresponding mixing holes 231.

[0164] In one embodiment, please refer to Figure 13 The top wall 2614 of the fuel collector 26 is not shown in the figure. The communicating vessel 27 has a cavity wall 271 that surrounds the air supply cavity 22. The cavity wall 271 includes a third wall 2711. The third walls 2711 are provided on opposite sides of the air supply cavity 22. A mixing hole group 23 is formed on each side of the third wall 2711, and the mixing holes 231 of the mixing hole groups 23 on both sides are arranged opposite to each other.

[0165] In one embodiment, please refer to Figure 13 The top wall 2614 of the fuel collector 26 is not shown in the figure. The fuel collector 26 has a surrounding wall 261 that encloses the second receiving chamber 24. The surrounding wall 261 includes a fourth wall 2613. The fourth wall 2613 is provided on opposite sides of the air supply chamber 22. The third walls 2711 on both sides are located between the fourth walls 2613 on both sides. The second receiving chamber 24 is at least partially located between each third wall 2711 and the corresponding fourth wall 2613. With this structure, a mixing hole group 23 is provided on each third wall 2711 on both sides. The second receiving chamber 24 is at least partially located between each third wall 2711 and the corresponding fourth wall 2613 on each side. The fuel in the second receiving chamber 24 enters the air supply chamber 22 of the communicating vessel 27 through the mixing holes 231 on the third wall 2711, where it mixes with the primary air to form a fuel-air mixture, which then enters the combustion chamber 3 for combustion. The mixing hole groups 23 on both sides are arranged relative to each other. When the flow rate and flow velocity of the fuel are large, the two streams of fuel entering the air supply chamber 22 from the symmetrically arranged mixing holes 231 collide with each other, so that the fuel and primary air are mixed more evenly. The fuel (such as hydrogen) will not impact and adhere to the wall surface of the third wall 2711 of the communicating vessel 27, thereby alleviating the risk of backfire.

[0166] In one embodiment, please refer to Figure 4 and Figure 11The fuel collector 26 includes a first mounting portion 262 and a second mounting portion 263. The first mounting portion 262 is mounted on the combustion chamber 1, and the first mounting portion 262 passes through the side wall of the combustion chamber 1. The first mounting portion 262 is formed with a fuel input cavity 2621 that is connected to the second receiving cavity 24. The second mounting portion 263 is connected to the first mounting portion 262, and the second mounting portion 263 is located in the combustion chamber 1. The second receiving cavity 24 is formed in the second mounting portion 263. With such a structural form, the fuel collector 26 is mounted on the combustion chamber 1 through the first mounting portion 262. The first mounting portion 262 passes through the side wall of the combustion chamber 1 so that the first mounting portion 262 can partially extend outside the combustion chamber 1, which is conducive to providing fuel from the outside of the combustion chamber 1 through the fuel input cavity 2621 of the first mounting portion 262 to the second receiving cavity 24 of the second mounting portion 263. The method of providing fuel is relatively safe.

[0167] The various embodiments / implementations provided in this application can be combined with each other without causing any contradiction.

[0168] 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 combustion device, characterized in that: include: Combustion chamber (1); as well as A fire bar (2) is at least partially located in the combustion chamber (1), the fire bar (2) and the combustion chamber (1) are arranged to form a combustion chamber (3), the number of the fire bar (2) is at least one, each of the fire bars (2) is formed with a first receiving chamber (21), an air supply chamber (22) and a mixing hole group (23), the air supply chamber (22) and the mixing hole group (23) are both located between the first receiving chamber (21) and the combustion chamber (3), the air supply chamber (22) is respectively connected to the first receiving chamber (21) and the combustion chamber (3), and the mixing hole group (23) is respectively connected to the first receiving chamber (21) and the combustion chamber (3). The combustion chamber (3) is connected, and the number of the mixing hole groups (23) corresponding to each of the fire bars (2) is multiple, and each of the mixing hole groups (23) includes at least one mixing hole (231), and the mixing hole (231) is connected to the air supply chamber (22), and the opening of the air supply chamber (22) at one end facing the combustion chamber (3) is an air outlet (222). Along the length direction of the fire bar (2), the lengths of the flow paths from two adjacent mixing hole groups (23) to the corresponding air outlet (222) are not equal. Along the length direction of the fire bar (2), among all the mixing hole groups (23) corresponding to each of the fire bars (2), the mixing hole group located at one end of the air supply cavity (22) is the third mixing hole group (23c), and the length of the flow path from the third mixing hole group (23c) to the corresponding air outlet (222) is the third distance; the mixing hole group located at the other end of the air supply cavity (22) is the fourth mixing hole group (23d), and the length of the flow path from the fourth mixing hole group (23d) to the corresponding air outlet (222) is the fourth distance; the remaining mixing hole groups (23) are all located between the third mixing hole group (23c) and the fourth mixing hole group (23d), and the length of the flow path from the remaining mixing hole groups (23) to the corresponding air outlet (222) is greater than or equal to the larger of the third distance and the fourth distance.

2. The combustion device according to claim 1, characterized in that Among the two adjacent mixing hole groups (23) along the length direction of the fire bar (2), one of the mixing hole groups (23) is a first mixing hole group (23a), and the other mixing hole group (23) is a second mixing hole group (23b), the length of the flow path from the first mixing hole group (23a) to the corresponding air outlet (222) and the length of the flow path from the second mixing hole group (23b) to the corresponding air outlet (222) are not equal, and the first mixing hole group (23a) and the second mixing hole group (23b) are alternately arranged along the length direction of the fire bar (2).

3. The combustion device according to claim 1, characterized in that Along the length direction of the fire bar (2), the length of the flow path from the mixing hole group (23) to the corresponding air outlet (222) changes periodically, and the length of the flow path from the mixing hole group (23) to the corresponding air outlet (222) first increases and then decreases, or first decreases and then increases within a period.

4. The combustion device according to any one of claims 1 to 3, characterized in that: The first receiving cavity (21) is used to receive primary air, and the mixing hole (231) is used to provide fuel to the air supply cavity (22). The number of air supply cavities (22) corresponding to each fire bar (2) is at least one, and the mixing hole groups (23) are provided on opposite sides of each air supply cavity (22). The mixing holes (231) of the mixing hole groups (23) on both sides are arranged relative to each other, and the relative arrangement direction of the mixing holes (231) on both sides is arranged to intersect with the length direction of the fire bar (2).

5. The combustion device according to any one of claims 1 to 3, characterized in that: The lengths of the flow paths from all mixing holes (231) in each mixing hole group (23) to the corresponding air outlet (222) are equal, and the length of the flow path from each mixing hole group (23) to the air outlet (222) is the length of the flow path from the corresponding mixing hole (231) to the corresponding air outlet (222).

6. The combustion device according to any one of claims 1 to 3, characterized in that: Each fire bar (2) corresponds to a plurality of air supply cavities (22), the plurality of air supply cavities (22) being arranged at intervals along the length direction of the fire bar (2), and each air supply cavity (22) corresponding to one mixing hole group (23).

7. The combustion device according to any one of claims 1 to 3, characterized in that: The first receiving chamber (21) is used to receive primary air, the air supply chamber (22) is used to receive primary air from the first receiving chamber (21), the mixing hole (231) is used to supply fuel to the air supply chamber (22), the opening of the end of the first receiving chamber (21) away from the air supply chamber (22) is a gas collecting port (211), the opening of the end of the air supply chamber (22) facing the first receiving chamber (21) is an air inlet (221), and the sum of the flow areas of all the gas collecting ports (211) is greater than the sum of the flow areas of all the air inlets (221).

8. The combustion device according to any one of claims 1 to 3, characterized in that: The first receiving chamber (21) is used to receive primary air, the air supply chamber (22) is used to receive primary air from the first receiving chamber (21), the mixing hole (231) is used to supply fuel to the air supply chamber (22), the air supply chamber (22) is a columnar structure, the flow cross section of the air supply chamber (22) is a target cross section, the air supply chamber (22) has a characteristic size, the characteristic size is the hydraulic diameter of the air supply chamber (22) or the minimum span on the target cross section through the geometric center of the target cross section, the length of the flow path from the mixing hole (231) to the corresponding air outlet (222) is greater than or equal to the characteristic size, and the length of the flow path from the mixing hole (231) to the corresponding air outlet (222) is less than or equal to ten times the characteristic size.

9. The combustion device according to any one of claims 1 to 3, characterized in that: The first receiving chamber (21) is used to receive primary air, the air supply chamber (22) is used to receive primary air from the first receiving chamber (21), the mixing hole (231) is used to supply fuel to the air supply chamber (22), and the flow area of ​​the first receiving chamber (21) gradually decreases along the direction from the first receiving chamber (21) to the air supply chamber (22). The opening of one end of the first receiving chamber (21) toward the air supply chamber (22) is a transition port (212). The arrangement direction of the cavities (22) is projected, and the opening of one end of the air supply cavity (22) facing the first receiving cavity (21) is an air inlet (221), and the projection area of ​​the air inlet (221) is located within the projection area of ​​the transition port (212); the sum of the flow areas of all the air inlets (221) is greater than or equal to 5 times the sum of the cross-sectional areas of all the mixing holes (231), and the sum of the flow areas of all the air inlets (221) is less than or equal to 10 times the sum of the cross-sectional areas of all the mixing holes (231).

10. The combustion device according to any one of claims 1 to 3, characterized in that: The first receiving chamber (21) is used to receive primary air, the air supply chamber (22) is used to receive primary air from the first receiving chamber (21), the mixing hole (231) is used to supply fuel to the air supply chamber (22), the opening of the air supply chamber (22) at one end of the first receiving chamber (21) facing the receiving chamber (21) is an air inlet (221), the opening of the first receiving chamber (21) at one end of the first receiving chamber (21) facing the air inlet (221) is a transition port (212), and when projected along the arrangement direction of the first receiving chamber (21) and the air supply chamber (22), the projection area of ​​the air inlet (221) is located within the projection area of ​​the transition port (212); the fire bar The number of (2) is multiple, the multiple fire bars (2) are arranged at intervals, the multiple fire bars (2) and the combustion chamber (1) are surrounded by an auxiliary chamber (4) connected to the combustion chamber (3), the auxiliary chamber (4) is used to receive secondary air, the minimum flow area of ​​the auxiliary chamber (4) is the first area, the sum of the flow areas of all the air inlets (221) 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%, and the second area ratio is less than or equal to the sum of the primary air ratio and 5%.

11. The combustion device according to claim 10, characterized in that: The primary air accounts for 50% to 70%.

12. The combustion device according to claim 1, characterized in that The fire bar (2) comprises: an air collector (25), wherein the first receiving cavity (21) is formed in the air collector (25); a fuel collector (26) at least partially located in the combustion chamber (1), the fuel collector (26) and the combustion chamber (1) enclosing the combustion chamber (3), the combustion collector being connected to the air collector (25), and the fuel collector (26) forming a second receiving chamber (24); and A communicating vessel (27) is connected to the fuel collector (26), the communicating vessel (27) is at least partially located in the second receiving cavity (24), and the air supply cavity (22) and the mixing hole group (23) are formed in the communicating vessel (27).

13. The combustion device according to claim 12, characterized in that: The number of the communicating vessels (27) is multiple, and the multiple communicating vessels (27) are arranged at intervals along the length direction of the fire bar (2). The fuel collector (26) has a surrounding wall (261) that surrounds the second receiving cavity (24). The surrounding wall (261) includes a first wall (2611) and a second wall (2612) that are arranged opposite to each other. The arrangement direction of the first wall (2611) and the second wall (2612) is arranged to intersect with the length direction of the fire bar (2). At least one communicating vessel (27) among all the communicating vessels (27) is a first communicating vessel (27a). The first communicating vessel (27a) The communicating vessels (27) are connected to the first wall (2611) and spaced apart from the second wall (2612), at least one of the communicating vessels (27) is a second communicating vessel (27b), the second communicating vessel (27b) is connected to the second wall (2612) and spaced apart from the first wall (2611), the first communicating vessels (27a) and the second communicating vessels (27b) are alternately arranged along the length direction of the fire bar (2), and when projected along the length direction of the fire bar (2), the projection area of ​​the first communicating vessel (27a) partially overlaps with the projection area of ​​the second communicating vessel (27b).

14. The combustion device according to claim 12 or 13, characterized in that: The fuel collector (26) comprises: a first mounting portion (262) mounted on the combustion chamber (1), the first mounting portion (262) penetrating a side wall of the combustion chamber (1), the first mounting portion (262) forming a fuel input cavity (2621) communicating with the second receiving cavity (24); and The second mounting portion (263) is connected to the first mounting portion (262), the second mounting portion (263) is located in the combustion chamber (1), and the second receiving cavity (24) is formed in the second mounting portion (263).

15. A gas water heater, characterized in that: include: The combustion device according to any one of claims 1 to 14; a heat exchanger located at one end of the combustion chamber (1) to receive heat released from the combustion chamber (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 combustion chamber (3).

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