Combustion system and gas equipment

Abstract

The invention relates to a combustion system and gas equipment, the combustion system comprises a combustion device, a mixing device and a gas supply device, the gas inlet end of a second mixer communicates with the gas outlet end of a first mixer, the gas outlet end of the second mixer communicates with the combustion device, and the gas supply device communicates with the gas inlet end of the first mixer and the combustion device. The gas equipment comprises the combustion system. According to the combustion system and the fuel gas equipment, the gas supply device is used for supplying the combustion-supporting gas and the fuel gas, the first mixer can pre-mix the combustion-supporting gas and the fuel gas, and the second mixer can further mix the combustion-supporting gas and the fuel gas, so that combustion is more sufficient during pre-mixing combustion.

Description

Technical Field

[0001] The present application relates to the technical field of hot water equipment, and in particular to a combustion system and a gas equipment. Background Art

[0002] Fully premixed combustion technology has been widely used in gas heating furnaces and gas water heaters. However, in existing fully premixed gas water heaters, the combustion flame is unstable after the power of the combustion system is adjusted, and the mixing ratio of air and gas cannot meet the use requirements well, and cannot adapt to the heat load requirements of multiple working conditions. Summary of the invention

[0003] Based on this, it is necessary to provide a combustion system and gas equipment to address the problem that the mixing ratio of air and gas in the existing combustion system cannot meet the usage requirements.

[0004] A combustion system includes a combustion device, a mixing device and an air supply device. The combustion device includes a combustion shell. The mixing device includes a first mixer arranged outside the combustion shell and a second mixer arranged inside the combustion shell. The air inlet end of the second mixer is connected to the air outlet end of the first mixer, and the air outlet end of the second mixer is connected to the combustion device. The air supply device is connected to the air inlet end of the first mixer and the combustion device respectively.

[0005] In the above combustion system, the gas supply device is used to supply combustion-supporting gas and fuel gas, the first mixer can premix the combustion-supporting gas and fuel gas, and the second mixer can further mix the combustion-supporting gas and fuel gas, so that the premixed combustion can be more complete.

[0006] In one embodiment, the air supply device includes a third ventilation assembly, a first ventilation assembly and a second ventilation assembly, the second ventilation assembly and the third ventilation assembly are both connected to the air inlet end of the first mixer, and the first ventilation assembly is connected to the combustion device; wherein the third ventilation assembly is used to transport one of the fuel gas and the combustion-supporting gas, the first ventilation assembly and the second ventilation assembly are both used to transport the other of the fuel gas and the combustion-supporting gas, and at least one of the first ventilation assembly and the second ventilation assembly can be conducted.

[0007] In one embodiment, the third ventilation component includes a first air supply component, the air supply device includes a second air supply component, and at least one of the first ventilation component and the second ventilation component can be connected to the second air supply component.

[0008] In one embodiment, the air supply device also includes a control valve arranged on the second air supply member, and the control valve is used to control at least one of the first ventilation component and the second ventilation component to be connected to the second air supply member; when the heat load demand is less than the preset heat load amount, the control valve connects the second air supply member and the first ventilation component; when the heat load demand is greater than or equal to the preset heat load amount, the control valve connects the second air supply member and the second ventilation component.

[0009] In one embodiment, the combustion device includes a first combustion zone and a second combustion zone, the second combustion zone is connected to the gas outlet end of the second mixer, and the first combustion zone is connected to the first ventilation component.

[0010] In one embodiment, the first mixer is a Venturi structure, and the second mixer includes a mixing shell and a gas chamber arranged in the mixing shell, the gas outlet end of the gas chamber is connected to the second combustion zone, and the gas inlet end of the gas chamber is connected to the gas outlet end of the first mixer.

[0011] In one embodiment, the combustion device also includes a fire cover and an ignition needle. The fire cover is accommodated in the mixing shell and divides the mixing shell into the gas chamber and a combustion chamber located at the top of the gas chamber. The ignition needle is arranged in the combustion chamber, and the first combustion zone and the second combustion zone are arranged in the fire cover.

[0012] In one of the embodiments, a circumferential side wall of the mixing housing is provided with a perspective window.

[0013] In one embodiment, the first ventilation assembly includes a first air inlet and a distribution unit, one end of the first air inlet is connected to the second air supply member and the other end is connected to one end of the distribution unit, and the other end of the distribution unit is connected to the first combustion zone.

[0014] In one embodiment, the distribution unit includes a first distribution member and a second distribution member, one end of the first distribution member is connected to the first air inlet member and the other end is connected to one end of the second distribution member, and the other end of the second distribution member is connected to the first combustion zone.

[0015] In one embodiment, the first distribution member is disposed outside the gas chamber, and the second distribution member is disposed inside the gas chamber.

[0016] In one embodiment, the first combustion zone includes a first combustion hole, and the second distribution member includes a diverter and a connecting member, one end of the connecting member is connected to the first combustion hole and the other end is connected to one end of the diverter, and the other end of the diverter is connected to the first distribution member.

[0017] In one embodiment, the second combustion zone includes at least two second combustion holes, and the first combustion zone includes at least two first combustion holes. The first combustion holes and the second combustion holes are distributed in the same direction to form a sub-combustion zone. The sub-combustion zone is arranged downstream of the diverter, and the number of the diverter corresponds one-to-one to the number of the sub-combustion zones.

[0018] In one embodiment, the second combustion zone includes at least two second combustion holes, and the first combustion zone includes at least two first combustion holes, the first combustion holes form a sub-combustion zone, and the second combustion holes form another sub-combustion zone, the sub-combustion zones formed by the first combustion holes and the sub-combustion zones formed by the second combustion holes are arranged alternately, and the sub-combustion zones are arranged downstream of the diverter, and the number of the diverters corresponds one-to-one to the number of sub-combustion zones formed by the first combustion holes.

[0019] In one of the embodiments, each of the flow dividers is connected to at least two of the connecting members, and the number of the connecting members corresponds one-to-one to the number of the first combustion holes connected to the corresponding flow dividers.

[0020] A gas-burning device comprises the above-mentioned combustion system.

[0021] In the above-mentioned gas equipment, the gas supply device of the combustion system is used to supply combustion-supporting gas and fuel gas. The first mixer can premix the combustion-supporting gas and fuel gas, and the second mixer can further mix the combustion-supporting gas and fuel gas, so that the premixed combustion can be more complete. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of a combustion system in one embodiment.

[0023] Figure 2 for Figure 1 Schematic diagram of the mixing device in the combustion system shown.

[0024] Figure 3 for Figure 1 Schematic diagram of the second mixer and distribution unit in the combustion system shown.

[0025] Figure 4 for Figure 3 A cross-sectional view of the second mixer and distribution unit is shown.

[0026] Reference numerals:

[0027] 100, combustion device; 101, first combustion hole; 102, second combustion hole; 110, fire cover; 120, ignition needle; 200, air supply device; 201, first air inlet; 202, second ventilation assembly; 210, first air supply; 211, air inlet; 212, air outlet; 220, control valve; 300, mixing device; 310, first mixer; 311, mixing chamber; 311, first air inlet end; 312, second air inlet end; 313, air outlet end; 320, second mixer; 321, mixing shell; 321a, bottom plate; 321b, first side plate; 321c, second side plate; 322, gas chamber; 322a, through hole; 323, combustion chamber; 324, perspective window; 400, distribution unit; 410, first distribution part; 420, second distribution part; 421, diverter; 422, connecting part. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0029] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0031] In this application, unless otherwise clearly specified and limited, the terms "initial", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0032] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0033] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0034] Please refer to Figure 1 and Figure 2 In one embodiment, a combustion system includes a combustion device 100, a mixing device 300 and an air supply device 200. The combustion device 100 includes a combustion shell. The mixing device 300 includes a first mixer 310 arranged outside the combustion shell and a second mixer 320 arranged inside the combustion shell. The air inlet end of the second mixer 320 is connected to the air outlet end 313 of the first mixer 310, and the air outlet end of the second mixer 320 is connected to the combustion device 100. The air supply device 200 is connected to the air inlet end of the first mixer 310 and the combustion device 100 respectively.

[0035] It should be noted that the gas supply device 200 is used to supply combustion-supporting gas and fuel gas, the combustion-supporting gas is air or oxygen, and the fuel gas is fuel. The first mixer 310 plays a role in preliminarily mixing air and gas, and the second mixer 320 is used to further mix air and gas so that the premixed combustion can be more fully burned.

[0036] In the above combustion system, the gas supply device 200 is used to supply combustion-supporting gas and fuel gas, the first mixer 310 can premix the combustion-supporting gas and fuel gas, and the second mixer 320 can further mix the combustion-supporting gas and fuel gas, so that the premixed combustion can be more complete.

[0037] Specifically, please refer to Figure 1 and Figure 2 The air supply device 200 includes a third ventilation component, a first ventilation component and a second ventilation component 202 . The second ventilation component 202 and the third ventilation component are both connected to the air inlet end of the first mixer 310 , and the first ventilation component is connected to the combustion device 100 .

[0038] Among them, the third ventilation assembly is used to transport one of the fuel gas and the combustion-supporting gas, the first ventilation assembly and the second ventilation assembly 202 are both used to transport the other of the fuel gas and the combustion-supporting gas, and at least one of the first ventilation assembly and the second ventilation assembly 202 can be conducted.

[0039] It should be noted that the user can choose to turn on at least one of the first ventilation component and the second ventilation component 202 according to the heat load demand, that is, the user can select at least one component that supplies fuel gas or combustion-supporting gas corresponding to the heat load demand.

[0040] For example, refer to Figure 1 When the heat load demand is small, only the first ventilation component is turned on, and air is input into the combustion device 100 through the third ventilation component, the first mixer 310, and the second mixer 320, and the gas is input into the combustion device 100 through the first ventilation component. After the air and the gas are sprayed into the combustion device 100, they are mixed and burned in the combustion device 100. At this time, when the heat load demand is small, the diffusion combustion mode is adopted to achieve flame stability, and no flashback occurs at low fire; when the heat load demand is large, only the second ventilation component 202 is turned on, and the third ventilation component inputs The air and the gas input from the second ventilation component 202 are premixed in the first mixer 310, enter the second mixer 320 for remixing, and then are output to the combustion device 100 for combustion. At this time, when the heat load demand is large, a premixed combustion mode is adopted to achieve full combustion, high combustion efficiency, and less exhaust gas generation; alternatively, the first ventilation component and the second ventilation component 202 can be turned on at the same time. At this time, there are both a premixed combustion mode and a diffusion combustion mode in the combustion device 100, which improves the combustion efficiency, ensures stable combustion, and reduces the generation of exhaust gas.

[0041] In the above-mentioned embodiment, no matter in the diffusion combustion mode or the premixed combustion mode, the third ventilation assembly is always the same, so as to make improvements on the basis of retaining the original structure of the air supply device 200, which is beneficial to saving costs.

[0042] Please refer to Figure 1The third ventilation component includes a first air supply component 210, the air supply device 200 includes a second air supply component, and at least one of the first ventilation component and the second ventilation component 202 can be connected to the second air supply component.

[0043] It should be noted that the first gas supply member 210 is used to supply one of the fuel gas and the combustion-supporting gas, and the second gas supply member is used to supply the other of the fuel gas and the combustion-supporting gas.

[0044] In this embodiment, the first gas supply member 210 is used to supply combustion-supporting gas, and the second gas supply member is used to supply fuel gas. Figure 1 The first air supply member 210 is a fan, and the fan has an air inlet 211 and an air outlet 212, and the air outlet 212 is connected to the first air inlet end 311 of the mixing device 300. When the fan is running, air flows into the fan from the air inlet 211, and is input into the first air inlet end 311 from the air outlet 212, and the air inlet 211 and the air outlet 212 form an air channel. In other embodiments, the first air supply member 210 is used to supply fuel gas, and the second air supply member is used to supply combustion-supporting gas.

[0045] Please refer to Figure 1 The air supply device 200 also includes a control valve 220 arranged on the second air supply component, and the control valve 220 is used to control at least one of the first ventilation component and the second ventilation component 202 to be connected to the second air supply component; when the heat load demand is less than the preset heat load amount, the control valve 220 connects the second air supply component and the first ventilation component; when the heat load demand is greater than the preset heat load amount, the control valve 220 connects the second air supply component and the second ventilation component 202.

[0046] It can be understood that in the embodiment where the third ventilation component delivers combustion-supporting gas, and the first ventilation component and the second ventilation component 202 deliver fuel gas: when the heat load demand is less than the preset heat load, the control valve 220 conducts between the second air supply component and the first ventilation component, and the second air supply component and the second ventilation component 202 are not conducted, and the gas is input into the combustion device 100 by the first ventilation component, and the gas does not enter the mixing device 300 and is not mixed with the air. At this time, when the heat load of the combustion system is small, the diffusion combustion mode is adopted, which can achieve flame stability, and no backfire occurs at a low fire;

[0047] When the heat load demand is greater than or equal to the preset heat load amount, the control valve 220 connects the second air supply part and the second ventilation component 202, and the second air supply part and the first ventilation component are not connected, and the gas is input into the mixing device 300 from the second ventilation component 202, and the gas will be mixed with the air in the mixing device 300. At this time, when the heat load of the combustion system is large, a premixed combustion method is adopted to achieve full combustion, high combustion efficiency, and less exhaust gas generation.

[0048] It should be noted that the hot water outlet temperature T is set by the user.设定 , and the controller obtains the inlet water temperature T 进水 , water inlet flow q. Current required heat load Q = k·C 水 ·(T 设定 -T 进水 )·q, where k is the correction factor, C 水 is the specific heat capacity of water, (T 设定 -T 进水 ) is the target temperature difference, and qwater flow is the water inlet flow.

[0049] The preset heat load is preferably the total heat load of the combustion system or gas equipment * preset percentage. The total heat load of the combustion system or gas equipment is the total heat load input or output of the combustion system or gas equipment, wherein the total heat load input of the combustion system or gas equipment = gas calorific value * gas consumption / t, t is the time required to input the corresponding gas consumption, and the total heat load output of the combustion system or gas equipment = k·C 水 ·25℃·q 标准 , where k is the correction factor, q 标准 is the water inlet flow rate under the standard test conditions of the corresponding system or whole machine, such as the water inlet flow rate q under the standard test conditions of a 16L gas water heater 标准 It is 16L / min.

[0050] In this embodiment, the preset percentage is preferably 10%-30%, that is, the preset heat load is preferably any value in the range of the total heat load of the combustion system or gas equipment * 10% to the total heat load of the combustion system or gas equipment * 30%, and the preset heat load is preferably the total heat load of the system or gas equipment * 20%. In other embodiments, the preset heat load can be any other value.

[0051] In this embodiment, the control valve 220 is an electromagnetic proportional valve, that is, the control valve 220 can be opened and closed by electric control. In other embodiments, the control valve 220 can also be a mechanical control valve, that is, the control valve 220 can be opened and closed manually.

[0052] Please refer to Figure 1 The combustion device 100 includes a first combustion zone and a second combustion zone. The second combustion zone is connected to the gas outlet end of the second mixer 320, and the first combustion zone is connected to the first ventilation assembly.

[0053] Specifically, in conjunction with reference Figure 3 , Figure 4 and Figure 2 The first mixer 310 is a Venturi structure, and the second mixer 320 includes a mixing shell 321 and an air chamber 322 arranged in the mixing shell 321, the air outlet end of the air chamber 322 is connected to the second combustion zone, and the air inlet end of the air chamber 322 is connected to the air outlet end 313 of the first mixer 310.

[0054] Here, the air inlet end of the air chamber 322 is provided with at least two through holes 322a, and the through holes 322a are connected to the air outlet end 313 of the first mixer 310. Among them, all the through holes 322a are round holes, square holes or other shapes.

[0055] It should be noted that the first mixer 310 is a Venturi structure, and its operating principle is similar to that of a Venturi tube. Figure 2 and Figure 1 The first mixer 310 has a first air inlet end 311, a second air inlet end 312 and an air outlet end 313. After the air enters the first mixer 310 from the first air inlet end 311, the pressure at the throat of the first mixer 310 decreases and a negative pressure is generated. Under the action of the negative pressure, the gas can be sucked into the first mixer 310 from the second air inlet end 312. The air and the gas merge at the throat and move together toward the air outlet end 313 of the first mixer 310, thereby playing a role of preliminary mixing.

[0056] In this embodiment, reference Figure 2 , the first air inlet end 311, the second air inlet end 312 and the air outlet end 313 of the first mixer 310 are arranged on different sides of the first mixer 310, the first air inlet end 311 is a square opening, and the second air inlet end 312 and the air outlet end 313 are circular openings. In other embodiments, the first air inlet end 311, the second air inlet end 312 and the air outlet end 313 of the first mixer 310 can also be arranged on the same side of the first mixer 310, and the first air inlet end 311, the second air inlet end 312 and the air outlet end 313 can also be in other shapes.

[0057] Please refer to Figure 4 The combustion device 100 also includes a fire cover 110 and an ignition needle 120. The fire cover 110 is accommodated in the mixing shell 321 and divides the mixing shell 321 into an air chamber 322 and a combustion chamber 323 located at the top of the air chamber 322. The ignition needle 120 is arranged in the combustion chamber 323, and the first combustion zone and the second combustion zone are arranged in the fire cover 110.

[0058] It is understandable that the gas output from the first combustion zone or the second combustion zone can flow to the combustion chamber 323 , be ignited by the ignition needle 120 and burn in the combustion chamber 323 .

[0059] In this embodiment, combined with reference Figure 3 and Figure 4 The mixing housing 321 includes a bottom plate 321a, a first side plate 321b and a second side plate 321c. The bottom plate 321a, the first side plate 321b and the second side plate 321c are arranged to form a receiving space. The fire cover 110 is received in the receiving space and divides the receiving space into a gas chamber 322 and a combustion chamber 323. The combustion chamber 323 is arranged in a height direction (i.e. Figure 4The bottom plate 321a, the first side plate 321b and the second side plate 321c are fixed by screws and sealed with a sealant. In other embodiments, the bottom plate 321a, the first side plate 321b and the second side plate 321c can also be an integrally formed structure.

[0060] For further information, please refer to Figure 3 The circumferential side wall of the mixing housing 321 is provided with a perspective window 324. Thus, the flame state in the combustion chamber 323 can be observed through the perspective window 324.

[0061] In this embodiment, the perspective window 324 may be provided on the first side plate 321 b and / or the second side plate 321 c.

[0062] Please refer to Figure 1 and Figure 4 The first ventilation assembly includes a first air inlet 201 and a distribution unit 400. One end of the first air inlet 201 is connected to the second air supply member and the other end is connected to one end of the distribution unit 400. The other end of the distribution unit 400 is connected to the first combustion zone. In this way, the fuel gas can be input into the distribution unit 400 through the first air inlet 201 and diverted to the first combustion zone through the distribution unit 400.

[0063] For further information, please refer to Figure 1 and Figure 4 The distribution unit 400 includes a first distribution member 410 and a second distribution member 420. One end of the first distribution member 410 is connected to the first air inlet member 201 and the other end is connected to one end of the second distribution member 420. The other end of the second distribution member 420 is connected to the first combustion zone.

[0064] Specifically, the first distribution member 410 is disposed outside the gas chamber 322, and the second distribution member 420 is disposed inside the gas chamber 322. In this way, the space utilization rate of the second mixer 320 can be improved.

[0065] In this embodiment, the first distribution member 410 is fixedly connected to the bottom wall of the combustion housing by screws. In other embodiments, the first distribution member 410 can also be detachably connected to the outer wall of the combustion housing by means of snap-fitting or plug-fitting.

[0066] In this embodiment, the first distribution member 410 and the second distribution member 420 are split structures and fixed by welding. In other embodiments, the first distribution member 410 and the second distribution member 420 can also be an integrated structure, which has good integrity and is easy to assemble quickly.

[0067] Specifically, refer to Figure 4The first combustion zone includes a first combustion hole 101, and the second distribution member 420 includes a diverter 421 and a connecting member 422. One end of the connecting member 422 is connected to the first combustion hole 101 and the other end is connected to one end of the diverter 421. The other end of the diverter 421 is connected to the first distribution member 410.

[0068] It can be understood that the gas supplied by the second gas supply member can be diverted to the first combustion zone through the first gas inlet member 201, the first distribution member 410, the diverter member 421 and the connecting member 422, which is conducive to more uniform distribution of the gas.

[0069] In this embodiment, the flow divider 421 and the connecting member 422 are both in the shape of a circular tube. In other embodiments, the flow divider 421 and the connecting member 422 can also be in the shape of a square tube or other shapes.

[0070] In one embodiment, please refer to Figure 1 and Figure 4 The second combustion zone includes at least two second combustion holes 102, and the first combustion zone includes at least two first combustion holes 101. The first combustion holes 101 and the second combustion holes 102 are distributed in the same direction to form a sub-combustion zone. The sub-combustion zone is arranged downstream of the diverter 421, and the number of diverters 421 corresponds to the number of sub-combustion zones.

[0071] Here, the sub-combustion zone is arranged downstream of the diverter 421, which means that along the flow direction of the gas, the gas flows from the diverter 421 to the connecting member 422 and then flows through the sub-combustion zone.

[0072] It should be noted that during diffusion combustion, one of the fuel gas and the combustion-supporting gas is output from the first combustion hole 101, and the other of the fuel gas and the combustion-supporting gas is output from the second combustion hole 102; during premixed combustion, a mixture of the fuel gas and the combustion-supporting gas is output from the second combustion hole 102 or the first combustion hole 101.

[0073] For example, in an embodiment where the third ventilation assembly delivers combustion-supporting gas and the first ventilation assembly and the second ventilation assembly 202 deliver fuel gas:

[0074] When the heat load is small, the diffusion combustion mode is turned on, and only the first ventilation component is turned on. Air flows into the mixing device 300 and is ejected from the second combustion hole 102 connected to the mixing device 300 and the second combustion zone, and the gas is ejected from the first combustion hole 101 of the first combustion zone connected to the first ventilation component. After the gas and air are mixed in the combustion device 100, they are ignited by the ignition needle and burn in the combustion chamber of the combustion device 100, so that flame-stable combustion can be achieved.

[0075] When the heat load is large, the premixed combustion mode is turned on, and only the second ventilation assembly 202 is turned on, air flows into the mixing device 300, and the gas flows into the mixing device 300, the air and the gas are mixed in the mixing device 300, and are ejected from the second combustion hole 102 connected to the mixing device 300 and the second combustion zone, and the mixed gas is ignited by the ignition needle and burns in the combustion chamber of the combustion device 100, which can achieve full combustion, high combustion efficiency, and less exhaust gas.

[0076] When the first combustion mode and the second combustion mode are turned on at the same time, the first ventilation assembly and the second ventilation assembly 202 are turned on at the same time, the gas is ejected from the first combustion hole 101, and the mixture of gas and air is ejected from the second combustion hole 102. After the gas is ignited, the air in the mixture of the second combustion hole 102 can be supplemented to the gas of the first combustion hole 101, so that the gas of the first combustion hole 101 can be ignited to achieve diffusion combustion; the mixture of the second combustion hole 102 can be directly ignited, and the second combustion hole 102 achieves premixed combustion. Diffusion combustion and premixed combustion are achieved at the same time, which improves combustion efficiency, ensures stable combustion, and reduces the generation of exhaust gas.

[0077] Preferably, along the gas flow direction, the second combustion hole 102 is a trumpet-shaped hole with a gradually increasing cross-sectional area. During diffusion combustion, air is ejected from the second combustion hole 102. Since the cross-sectional area of ​​the second combustion hole 102 gradually increases, the air flow rate decreases, making it less likely for flame separation to occur during diffusion combustion, and the contact time between the air and the gas ejected from the first combustion hole 101 increases, resulting in more complete mixing before combustion, more complete combustion, and less exhaust gas generated; during premixed combustion, a mixed gas of air and gas is ejected from the second combustion hole 102. Since the cross-sectional area of ​​the second combustion hole 102 gradually increases, the mixing flow rate decreases, making it less likely for flame separation to occur during premixed combustion. In addition, since premixed combustion is only started when the combustion heat load demand is large, it is not easy to produce backfire.

[0078] In this embodiment, the first combustion hole 101 and the second combustion hole 102 are arranged along Figure 1 and Figure 4 The X direction and / or Y direction are alternately distributed, Figure 1 and Figure 4 The X direction is the length direction of the combustion device 100. Figure 1 and Figure 4The Y direction is the width direction of the combustion device 100. In this way, it can effectively ensure that the air ejected from the second combustion hole 102 and the gas ejected from the first combustion hole 101 are evenly distributed during diffusion combustion, which is conducive to the uniform mixing of air and gas, and avoids the shortening of the life of the combustion device 100 due to uneven temperature distribution during combustion of the combustion device 100. At the same time, the first combustion hole 101 and the second combustion hole 102 are alternately distributed along the same direction, which can ensure that the second combustion hole 102 is evenly distributed in the combustion device 100, thereby ensuring that the mixed gas ejected from the second combustion hole 102 is evenly distributed in the combustion device 100, and avoids the shortening of the life of the combustion device 100 due to uneven temperature distribution during combustion of the combustion device 100.

[0079] In other embodiments, the first combustion holes 101 and the second combustion holes 102 may also be distributed in other ways, for example: the first combustion zone formed by the first combustion hole 101 and the second combustion zone formed by the second combustion hole 102 are distributed left and right along the length direction of the combustion device 100 or left and right along the width direction; or there are at least two first combustion zones and at least two second combustion zones, the first combustion zone includes at least two first combustion holes 101, the second combustion zone includes at least two second combustion holes 102, and the first combustion zone or the second combustion zone is evenly distributed on the combustion device 100.

[0080] In another embodiment, please refer to Figure 3 The second combustion zone includes at least two second combustion holes 102, and the first combustion zone includes at least two first combustion holes 101. The first combustion holes 101 form a sub-combustion zone, and the second combustion holes 102 form another sub-combustion zone. The sub-combustion zones formed by the first combustion holes 101 and the sub-combustion zones formed by the second combustion holes 102 are arranged alternately, and the sub-combustion zones are arranged downstream of the diverter 421. The number of diverters 421 corresponds one to one to the number of sub-combustion zones formed by the first combustion holes 101.

[0081] For further information, please refer to Figure 4 Each flow divider 421 is connected to at least two connecting members 422, and the number of connecting members 422 corresponds to the number of first combustion holes 101 connected to the corresponding flow divider 421. In this way, the gas is evenly distributed.

[0082] Please refer to Figure 1 , the gas equipment in one embodiment includes the above-mentioned combustion system.

[0083] Specifically, the gas equipment is a water heater or a wall-mounted boiler. In addition to the above-mentioned combustion system, the gas equipment also includes other components such as a shell, a heat exchange system, a control system, and a detection system.

[0084] In the above-mentioned gas equipment, the gas supply device 200 of the combustion system is used to supply combustion-supporting gas and fuel gas. The first mixer 310 can premix the combustion-supporting gas and fuel gas, and the second mixer 320 can further mix the combustion-supporting gas and fuel gas, so that the premixed combustion can be more complete.

[0085] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0086] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A combustion system, characterized in that: include: A combustion device (100) comprises a combustion casing; A mixing device (300), comprising a first mixer (310) arranged outside the combustion housing and a second mixer (320) arranged inside the combustion housing, wherein an air inlet end of the second mixer (320) is connected to an air outlet end of the first mixer (310), and an air outlet end of the second mixer (320) is connected to the combustion device (100); The air supply device (200) is respectively connected to the air inlet end ventilation component of the first mixer (310) and the combustion device (100).

2. The combustion system according to claim 1, characterized in that: The air supply device (200) comprises a third ventilation component, a first ventilation component and a second ventilation component (202), the second ventilation component (202) and the third ventilation component are both connected to the air inlet end of the first mixer (310), and the first ventilation component is connected to the combustion device (100); The third ventilation assembly is used to transport one of the fuel gas and the combustion-supporting gas, the first ventilation assembly and the second ventilation assembly (202) are both used to transport the other of the fuel gas and the combustion-supporting gas, and at least one of the first ventilation assembly and the second ventilation assembly (202) can be conducted.

3. The combustion system according to claim 2, characterized in that: The third ventilation component comprises a first air supply component (210), the air supply device (200) comprises a second air supply component, and at least one of the first ventilation component and the second ventilation component (202) can be in communication with the second air supply component.

4. The combustion system according to claim 3, characterized in that: The air supply device (200) further comprises a control valve (220) provided on the second air supply component, wherein the control valve (220) is used to control at least one of the first ventilation component and the second ventilation component (202) to be in communication with the second air supply component; When the heat load demand is less than the preset heat load amount, the control valve (220) connects the second air supply component and the first ventilation component; when the heat load demand is greater than or equal to the preset heat load amount, the control valve (220) connects the second air supply component and the second ventilation component (202).

5. The combustion system according to claim 3, characterized in that: The combustion device (100) comprises a first combustion zone and a second combustion zone, the second combustion zone is connected to the gas outlet end of the second mixer (320), and the first combustion zone is connected to the first ventilation component.

6. The combustion system according to claim 5, characterized in that: The first mixer (310) is a Venturi structure, and the second mixer (320) includes a mixing shell (321) and an air chamber (322) arranged in the mixing shell (321), the air outlet end of the air chamber (322) is connected to the second combustion zone, and the air inlet end of the air chamber (322) is connected to the air outlet end of the first mixer (310).

7. The combustion system according to claim 6, characterized in that: The combustion device (100) further comprises a fire cover (110) and an ignition needle (120); the fire cover (110) is accommodated in the mixing shell (321) and divides the mixing shell (321) into the gas bin (322) and a combustion chamber (323) located at the top of the gas bin (322); the ignition needle (120) is arranged in the combustion chamber (323); and the first combustion zone and the second combustion zone are arranged in the fire cover (110).

8. The combustion system according to claim 6, characterized in that: A perspective window (324) is provided on the circumferential side wall of the mixing housing (321).

9. The combustion system according to claim 6, characterized in that: The first ventilation component comprises a first air inlet (201) and a distribution unit (400), one end of the first air inlet (201) is connected to the second air supply part and the other end is connected to one end of the distribution unit (400), and the other end of the distribution unit (400) is connected to the first combustion zone.

10. The combustion system according to claim 9, characterized in that: The distribution unit (400) comprises a first distribution member (410) and a second distribution member (420), one end of the first distribution member (410) is connected to the first air intake member (201) and the other end is connected to one end of the second distribution member (420), and the other end of the second distribution member (420) is connected to the first combustion zone.

11. The combustion system according to claim 10, characterized in that: The first distribution component (410) is disposed outside the gas chamber (322), and the second distribution component (420) is disposed inside the gas chamber (322).

12. The combustion system according to claim 10, characterized in that: The first combustion zone includes a first combustion hole (101), and the second distribution member (420) includes a diverter member (421) and a connecting member (422), one end of the connecting member (422) is connected to the first combustion hole (101) and the other end is connected to one end of the diverter member (421), and the other end of the diverter member (421) is connected to the first distribution member (410).

13. The combustion system according to claim 12, characterized in that: The second combustion zone includes at least two second combustion holes (102), and the first combustion zone includes at least two first combustion holes (101). The first combustion holes (101) and the second combustion holes (102) are distributed along the same direction to form a sub-combustion zone. The sub-combustion zone is arranged downstream of the diverter (421), and the number of the diverter (421) corresponds one-to-one to the number of the sub-combustion zones.

14. The combustion system according to claim 12, characterized in that: The second combustion zone includes at least two second combustion holes (102), and the first combustion zone includes at least two first combustion holes (101). The first combustion holes (101) form a sub-combustion zone, and the second combustion holes (102) form another sub-combustion zone. The sub-combustion zones formed by the first combustion holes (101) and the sub-combustion zones formed by the second combustion holes (102) are arranged alternately, and the sub-combustion zones are arranged downstream of the diverter (421). The number of the diverter (421) corresponds one-to-one to the number of the sub-combustion zones formed by the first combustion holes (101).

15. The combustion system according to claim 13 or 14, characterized in that: At least two connecting members (422) are connected to each of the flow dividing members (421), and the number of the connecting members (422) corresponds one-to-one to the number of the first combustion holes (101) connected to the corresponding flow dividing members (421).

16. A gas equipment, characterized in that: Comprising a combustion system as described in any one of claims 1-15.

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