Air duct system, combustion device and gas stove

Abstract

The invention relates to the technical field of kitchen equipment, in particular to an air duct system, a combustion device and a gas stove. The air duct system comprises a fan, a first shell and a second shell, the first shell and the second shell are buckled with each other, and an air duct cavity is defined by the first shell and the second shell. The draught fan is connected with the second shell and used for driving airflow to flow to the fire cover assembly from the air channel cavity so as to provide secondary air supply for the fire cover assembly. According to the air duct system of the combustion device, the air duct system with the air duct cavity is arranged, so that the air duct cavity can provide a buffering and pressure reducing space for air flow with high flow speed and high air pressure, and the air flow can be uniformly distributed in the air duct cavity firstly and can enter the fire cover assembly more stably; therefore, stable supplementary airflow can be provided for the combustion area of the fire cover, and the flame stability can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of kitchen appliances, and particularly to an air duct system, a combustion device, and a gas stove. Background Art

[0002] A gas stove is a combustion device that heats a workpiece to be heated, such as a cooking pot, placed on the gas stove. Currently, gas stoves are developing towards intelligent stoves and high-efficiency stoves. In related technologies, in order to make the combustion device have a better combustion effect, it can be achieved by increasing the secondary air supply amount of the combustion device.

[0003] Specifically, there is a forced air supply gas stove in the prior art. The fan is installed at the ejector nozzle of the burner head, and the fan blows air to forcibly provide the primary air for combustion to achieve the full premixed combustion of gas and air. However, it is difficult for the gas stove to achieve matching in terms of gas ratio and air volume, which is likely to cause uneven flames. In addition, the flame temperature of the full premixed burner is high, which easily causes a high temperature in the cavity of the gas stove, a hot panel, and a high temperature of the knob. These will all affect the use of consumers. In addition, the controller is in a high temperature environment for a long time, and its service life will also be shortened. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the related technologies. For this purpose, the present invention provides an air duct system, a combustion device, and a gas stove.

[0005] According to an air duct system of a combustion device provided by the present invention, it includes:

[0006] A first housing and a second housing that are buckled with each other. The first housing and the second housing define an air duct cavity, and the first housing is used to connect to the burner head assembly;

[0007] A fan, which is connected to the second housing. The fan is used to drive air flow from the air duct cavity to the burner head assembly to provide secondary air supply for the burner head assembly.

[0008] According to the air duct system of the combustion device of the embodiment of the present invention, by providing an air duct system with an air duct cavity, the air duct cavity can provide a space for buffering and decompressing the air flow with a large flow rate and high air pressure. In this way, the air flow can be evenly distributed in the air duct cavity first, and thus can enter the burner head assembly more stably, thereby providing a stable supplementary air flow for the combustion area of the burner head, and further improving the flame stability.

[0009] According to the air duct system of the combustion device provided by the present invention, a plurality of first air holes are provided on the first housing, and each first air hole is communicated with the air duct cavity;

[0010] On one side of the first housing facing away from the second housing, there are two spaced-apart first limiting ribs. Each first limiting rib is annular. A first air supplement groove is formed between the two first limiting ribs. The first air supplement groove communicates with the air duct cavity through the first air holes. A plurality of the first air holes are spaced apart and distributed on the bottom wall of the first air supplement groove.

[0011] According to the air duct system of the combustion device provided by the present invention, a plurality of second air holes are provided on the first housing, and each second air hole communicates with the air duct cavity;

[0012] On one side of the first housing facing away from the second housing, there are two spaced-apart second limiting ribs. A second air supplement groove is formed between the two second limiting ribs. The second air supplement groove is sleeved outside the first air supplement groove. The second air supplement groove communicates with the air duct cavity through the second air holes. A plurality of the second air holes are spaced apart and distributed on the bottom wall of the second air supplement groove.

[0013] According to the air duct system of the combustion device provided by the present invention, an outer ring gas groove is defined between the second limiting rib located in the inner ring and the first limiting rib located in the outer ring. The outer ring gas groove is adapted to supply gas to the outer ring fire holes of the burner head assembly;

[0014] An independent outer ring gas passage is provided in the air duct cavity. One end of the outer ring gas passage penetrates through the second housing and communicates with the outer ring intake pipe of the burner head, and the other end penetrates through the first housing and communicates with the outer ring gas groove.

[0015] According to the air duct system of the combustion device provided by the present invention, there are a plurality of the outer ring gas passages, and the plurality of outer ring gas passages are evenly distributed on the same circle;

[0016] In the circumferential direction of the first limiting rib, the outer ring gas passage is strip-shaped.

[0017] According to the air duct system of the combustion device provided by the present invention, the surface of the first housing facing the second housing has a first outer ring convex column, and the first outer ring convex column is a hollow structure.

[0018] The surface of the second housing facing the first housing has a second outer ring convex column, and the second outer ring convex column is a hollow structure. The first outer ring convex column and the second outer ring convex column are spliced, and their hollow structures define the outer ring gas passage.

[0019] According to the air duct system of the combustion device provided by the present invention, the first housing is provided with spaced ribs and a central air duct. The central air duct penetrates through the first housing and communicates with the air duct cavity. There are a plurality of spaced-apart central air ducts, and the plurality of central air ducts are arranged in a circular shape. The spaced ribs are cylindrical, the spaced ribs are sleeved inside the inner ring of the first air supplement groove, and the plurality of central air ducts are distributed inside the spaced ribs.

[0020] According to the air duct system of the combustion device provided by the present invention, an inner ring gas groove is defined between the spaced ribs and the first limiting rib located in the inner ring. The inner ring gas groove is adapted to supply gas to the central fire holes of the burner head assembly.

[0021] An independent inner ring gas passage is provided in the air duct cavity. One end of the inner ring gas passage penetrates through the second housing and communicates with the inner ring intake pipe of the burner, and the other end penetrates through the first housing and communicates with the inner ring gas groove.

[0022] According to the air duct system of the combustion device provided by the present invention, there are a plurality of inner ring gas passages, and the plurality of inner ring gas passages are evenly distributed on the same circle.

[0023] In the circumferential direction of the first limiting rib, the inner ring gas passage is strip-shaped.

[0024] According to the air duct system of the combustion device provided by the present invention, the surface of the first housing facing the second housing has a first inner ring convex column, and the first inner ring convex column is a hollow structure.

[0025] The surface of the second housing facing the first housing has a second inner ring convex column, and the second inner ring convex column is a hollow structure. The first inner ring convex column and the second inner ring convex column are spliced, and their hollow structures define the inner ring gas passage.

[0026] According to the air duct system of the combustion device provided by the present invention, a part of the surface of the second housing facing the first housing is concave to define a buffer cavity. The buffer cavity communicates with the air duct cavity, and the air outlet end of the blower is communicated with the buffer cavity.

[0027] According to the air duct system of the combustion device provided by the present invention, it further includes a mounting bracket, and the blower is connected to the second housing through the mounting bracket.

[0028] According to the air duct system of the combustion device provided by the present invention, the mounting bracket includes a fitting part and a supporting part connected to the fitting part. The fitting part is fitted and fixedly connected to the second housing. The fitting part is provided with a hollow part, and the air outlet end of the blower passes through the hollow part to communicate with the air duct cavity.

[0029] The blower is fixedly connected to the supporting part.

[0030] According to the air duct system of the combustion device provided by the present invention, the surface of the first housing facing the second housing has a first stepped portion, the first stepped portion extends along the circumferential direction of the first housing, the surface of the second housing facing the first housing has a second stepped portion, the second stepped portion extends along the circumferential direction of the second housing, and the second stepped portion is in sealing cooperation with the first stepped portion.

[0031] According to the air duct system of the combustion device provided by the present invention, at least one of the first housing and the second housing is a casting or a die casting.

[0032] The combustion device provided according to the present invention includes:

[0033] A burner head;

[0034] An air duct system, the air duct system being the air duct system as described above;

[0035] A burner cap assembly, the air duct system being connected between the burner cap assembly and the burner head,

[0036] The burner cap assembly includes:

[0037] A central burner cap, on which a first central air supply hole, a second central air supply hole and a central flame hole are provided, the first central air supply hole being used to supply air to the central flame hole, and the central flame holes being distributed around the central axis of the central burner cap;

[0038] An outer ring burner cap, which is sleeved outside the central burner cap, on which outer ring flame holes are provided, the second central air supply hole being used to supply air to the outer ring flame holes, and the outer ring flame holes being distributed around the central axis of the central burner cap,

[0039] Wherein, the first central air supply hole and the second central air supply hole are both communicated with the air duct cavity.

[0040] According to the combustion device provided by the present invention, a first air supply channel is provided on the central burner cap, and the first air supply channel is communicated with both the first central air supply hole and the second central air supply hole.

[0041] The gas stove provided according to the present invention includes the combustion device as described above.

[0042] The additional aspects and advantages of the present invention will be partly given in the following description, partly will become obvious from the following description, or be understood through the practice of the present invention. Description of the Drawings

[0043] To more clearly illustrate the technical solutions in the embodiments of the present invention or in the related art, the following will briefly introduce the drawings required for use in the description of the embodiments or the related art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0044] Figure 1 is a schematic three-dimensional structure diagram of a combustion device provided by an embodiment of the present invention;

[0045] Figure 2 is an exploded view of a combustion device provided by an embodiment of the present invention;

[0046] Figure 3 is a schematic structure diagram of a first housing of a combustion device provided by an embodiment of the present invention;

[0047] Figure 4 is a schematic structure diagram of the first housing of the combustion device from another perspective provided by an embodiment of the present invention;

[0048] Figure 5 is a schematic structure diagram of the first housing of the combustion device from yet another perspective provided by an embodiment of the present invention;

[0049] Figure 6 is a schematic structure diagram of a second housing of the combustion device from another perspective provided by an embodiment of the present invention;

[0050] Figure 7 is a partial cross-sectional schematic diagram of a combustion device with a cover provided by an embodiment of the present invention;

[0051] Figure 8 is Figure 7 a partial structure schematic diagram of;

[0052] Figure 9 is Figure 7 a partial structure schematic diagram of;

[0053] Figure 10 is Figure 7 a schematic diagram of another perspective of the combustion device structure in;

[0054] Figure 11 is Figure 10 a partial structure schematic diagram of;

[0055] Figure 12 is Figure 10 a partial structure schematic diagram of.

[0056] Reference numerals:

[0057] 100, burner cap assembly;

[0058] 110. Central burner cap; 111. First air supplement channel; 112. First central air supplement hole; 113. Second central air supplement hole; 114. Central burner hole; 115. Central air hole;

[0059] 120. Outer ring burner cap; 121. Outer ring burner hole; 122. Outer ring air hole; 123. Assembly gap;

[0060] 200. Combustion device;

[0061] 210. Burner head; 211. Ignition pin; 212. Thermocouple; 213. Outer ring intake pipe; 214. Inner ring intake pipe; 215. Outer ring intake cavity; 216. Inner ring intake cavity;

[0062] 220. Air duct system; 221. Air duct cavity; 222. Central air duct; 2201. Outer ring gas channel; 2202. Inner ring gas channel; 2203. Buffer cavity;

[0063] 227. First housing; 2271. First air hole; 223. First limiting rib; 224. First air supplement groove; 2272. First outer ring convex column; 2273. Spacing rib; 2274. Inner ring gas groove; 2275. First inner ring convex column; 2276. First step portion;

[0064] 228. Second housing; 2281. Second air hole; 225. Second limiting rib; 226. Second air supplement groove; 2282. Outer ring gas groove; 2283. Second outer ring convex column; 2284. Second inner ring convex column; 2285. Second step portion;

[0065] 230. Fan; 231. Mounting bracket; 232. Fitting portion; 233. Hollowed portion; 234. Supporting portion. Detailed implementation manners

[0066] The following further describes in detail the implementation manners of the present invention in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0067] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationships indicated by the terms "central", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the embodiments of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0068] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly defined and limited, the terms "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0069] In the embodiments of the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0070] In the description of this specification, the descriptions with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples.

[0071] The following will refer to Figures 1 - 12 Describe in detail the air duct system 220, the combustion device 200 and the gas stove according to the embodiments of the present invention. The structure of the combustion device 200 can be applied to a gas stove. Of course, the combustion device 200 can also be applied to other combustion devices. In this regard, this application does not make any restrictions.

[0072] It should be understood that the combustion device 200 is a device that generates a flame by burning fuel gas. After the fuel gas is introduced into the gas device, the fuel gas mixes with air to form a mixed gas. After the mixed gas is ignited, a flame can be formed. Therefore, the combustion device 200 needs to be connected to a gas pipe to input fuel gas into the combustion device 200, and the combustion device 200 also needs to be provided with an air inlet for air to enter, so that air can mix with the fuel gas to form a mixed gas. The fuel gas input into the gas stove by the gas pipe can mix with the primary air to form a mixed gas. The primary air is sucked into the ejector pipe during the process of the gas being input into the ejector pipe of the combustion device 200, so that the primary air mixes with the gas to form a mixed gas. The secondary air is the air that mixes with the gas again after the primary air and the gas are mixed.

[0073] In addition, it should also be understood that in the combustion device 200, whether it is the primary air or the secondary air, their functions are to make the gas burn more fully. Therefore, when the gas flow rate of the gas stove is constant, the higher the supply amounts of the primary air and the secondary air, the more fully the gas can burn, and thus the combustion device 200 has a better combustion effect.

[0074] As Figure 2 shown, the air duct system 220 of the combustion device 200 according to an embodiment of the present invention includes a blower 230 and a first housing 227 and a second housing 228 that are buckled with each other.

[0075] Specifically, as shown in Figure 2 shown, the first housing 227 is connected to the burner cap assembly 100, the blower 230 is connected to the second housing 228, the first housing 227 and the second housing 228 define an air duct cavity 221, and the blower 230 is used to drive the air flow to flow from the air duct cavity 221 to the burner cap assembly 100 to provide secondary air supply for the burner cap assembly 100. It should be noted that the air flow blown by the blower 230 can flow through the air duct cavity 221 to the burner cap assembly 100. In this way, the air duct cavity 221 can provide a space for buffering and decompressing the air flow with high flow rate and high air pressure. In this way, the air flow can be evenly distributed in the air duct cavity 221 first, and thus can enter the burner cap assembly 100 more stably, so as to provide a stable supplementary air flow for the combustion area of the burner cap, and further improve the flame stability.

[0076] The air duct system 220 of the combustion device 200 according to an embodiment of the present invention, by providing the air duct system 220 with the air duct cavity 221, the air duct cavity 221 can provide a space for buffering and decompressing the air flow with high flow rate and high air pressure. In this way, the air flow can be evenly distributed in the air duct cavity 221 first, and thus can enter the burner cap assembly 100 more stably, so as to provide a stable supplementary air flow for the combustion area of the burner cap, and further improve the flame stability.

[0077] In some examples, the blower 230 can be a blower. The blower 230 can be used to provide an air flow to a combustion process or other applications that require a large amount of air flow. During the combustion process, the blower 230 can promote the combustion reaction of the fuel by providing sufficient air flow. The blower 230 sucks in air and sends the air into the air duct cavity 221 through the air flow generated by the blower 230, thereby providing the oxygen required for the combustion process. This helps to increase the combustion efficiency and ensure that the fuel can burn fully. The blower 230 needs to have a high air flow generating capacity, stability and reliability. Therefore, when selecting the blower 230, parameters such as the air volume, air pressure, power, and efficiency of the blower 230 need to be considered to ensure that it can meet the requirements of the blower 230 application.

[0078] According to some embodiments of the present invention, such as Figure 3 and Figure 4 shown, a plurality of first air holes 2271 are provided on the first housing 227, and each first air hole 2271 communicates with the air duct cavity 221. In this way, the supply air flow can flow through the first air holes 2271 to the burner head assembly 100. Further, two spaced-apart first limiting ribs 223 are provided on a side of the first housing 227 facing away from the second housing 228. Each first limiting rib 223 is annular, and a first air supplement groove 224 is formed between the two first limiting ribs 223. The first air supplement groove 224 communicates with the air duct cavity 221 through the first air holes 2271, and the plurality of first air holes 2271 are spaced apart and distributed on the bottom wall of the first air supplement groove 224. It should be noted that, on the one hand, when the air flow passes through the first air holes 2271 and enters the first air supplement groove 224, the air flow can be depressurized again, so that the air flow can be more stable; on the other hand, the plurality of first air holes 2271 are spaced apart and distributed on the bottom wall of the first air supplement groove 224, so that the air flow can be evenly distributed in the first air supplement groove 224, and then the air flow can evenly flow to the burner head assembly 100. In addition, the two spaced-apart first limiting ribs 223 can also support the burner head assembly 100, thereby improving the assembly stability between the burner head assembly 100 and the air duct system 220.

[0079] Combined with Figure 12 and Figure 3 shown, the first limiting rib 223 can separate the air duct cavity 221 and the burner head assembly 100, that is, the air duct system 220 separates the mixed gas and air respectively. The mixed gas is introduced into the fire holes of the burner head assembly 100, and air can be introduced to supplement air on both sides of the fire holes, thereby fully supplementing air for gas combustion and enabling the gas to burn fully.

[0080] According to some embodiments of the present invention, combined with Figure 12 , Figure 2 and Figure 3As shown, a central air hole 115 is provided on the central burner cap 110, and a central air duct 222 is provided on the air duct system 220. One end of the central air duct 222 communicates with the air duct cavity 221, and the other end communicates with the central air hole 115. In this way, the air in the air duct cavity 221 can flow through the central air duct 222 to the central air hole 115, so that the air flow can stably flow to the central air hole 115, and the air in the central air hole 115 can stably flow to the combustion area of the central burner hole 114, thereby realizing stable and sufficient secondary air supply.

[0081] According to some embodiments of the present invention, as Figure 3 and Figure 4 shown, a plurality of second air holes 2281 are provided on the first housing 227, and each second air hole 2281 communicates with the air duct cavity 221. In this way, the supplementary air flow can flow to the burner cap assembly 100 through the second air holes 2281. Further, on the side of the first housing 227 facing away from the second housing 228, two spaced second limiting ribs 225 are provided, and a second air supply groove 226 is constructed between the two second limiting ribs 225. The second air supply groove 226 is sleeved outside the first air supply groove 224, and the second air supply groove 226 communicates with the air duct cavity 221 through the second air holes 2281. The plurality of second air holes 2281 are spaced apart and distributed on the bottom wall of the second air supply groove 226. It should be noted that, on the one hand, when the air flow enters the second air supply groove 226 through the second air holes 2281, the air flow can be depressurized again, so that the air flow can be more stable; on the other hand, the plurality of second air holes 2281 are spaced apart and distributed on the bottom wall of the second air supply groove 226, so that the air flow can be evenly distributed in the second air supply groove 226, and then the air flow can evenly flow to the burner cap assembly 100. In addition, the two spaced second limiting ribs 225 can also support the burner cap assembly 100, thereby improving the assembly stability between the burner cap assembly 100 and the air duct system 220.

[0082] According to some embodiments of the present invention, in combination with Figure 2 and Figure 4 shown, the second limiting rib 225 can separate the air duct cavity 221 and the burner cap assembly 100, that is, the air duct system 220 separates the mixed gas and air respectively. The mixed gas is introduced into the burner holes of the burner cap assembly 100, and air can be introduced to supplement air on both sides of the burner holes, thereby fully supplementing air for gas combustion and enabling the gas to burn fully.

[0083] According to some embodiments of the present invention, as Figure 5 and Figure 6As shown, an outer ring gas groove 2282 is defined between a second limiting rib 225 located in the inner ring and a first limiting rib 223 located in the outer ring. The outer ring gas groove 2282 is adapted to supply gas to the outer ring fire holes 121 of the burner head assembly 100. An independent outer ring gas passage 2201 is provided in the air duct cavity 221. One end of the outer ring gas passage 2201 penetrates through the second housing 228 and communicates with the outer ring intake pipe 213 of the burner head 210, and the other end penetrates through the first housing 227 and communicates with the outer ring gas groove 2282. For example, refer to Figure 2 As shown, an outer ring intake cavity 215 is provided on the burner head 210. The outer ring intake cavity 215 communicates with the outer ring gas passage 2201 and the outer ring intake pipe 213. The gas entering the outer ring intake cavity 215 through the outer ring intake pipe 213 can enter the outer ring gas passage 2201 through the outer ring intake cavity 215, so as to supply gas to the burner head assembly 100. On the one hand, the air duct system 220 can be arranged between the burner head 210 and the burner head assembly 100. The outer ring gas passage 2201 can flow from the burner head 210 through the air duct system 220 to the burner head assembly 100. The outer ring gas passage 2201 is independent of the air duct cavity 221, so that the burner head 210 can supply gas to the burner head assembly 100.

[0084] In order to enable the gas to smoothly and sufficiently enter the burner head assembly 100, according to some embodiments of the present invention, such as Figure 4 and Figure 5 As shown, there are a plurality of outer ring gas passages 2201, and the plurality of outer ring gas passages 2201 are evenly distributed on the same circle. In the circumferential direction of the first limiting rib 223, the outer ring gas passage 2201 is strip-shaped. The strip-shaped structure has a large flow cross-section, so that the outer ring gas passage 2201 can supply sufficient gas to the burner head assembly 100, and thus the performance of the combustion device 200 can be improved.

[0085] Refer to Figure 4 As shown, a first air supplement groove 224 is provided on the radially inner side of the outer ring gas passage 2201, and a second air supplement groove 226 is provided on the radially outer side of the outer ring gas passage 2201. In this way, the first air supplement groove 224 and the second air supplement groove 226 can supplement air to the outer ring gas passage 2201 simultaneously from the radial inner side and the outer side, so that the gas in the outer ring gas passage 2201 can be fully burned in the combustion area, and thus the thermal conversion rate of the combustion device 200 can be improved.

[0086] According to some embodiments of the present invention, such as Figure 5 As shown, the surface of the first housing 227 facing the second housing 228 has a first outer ring convex column 2272, and the first outer ring convex column 2272 is a hollow structure. As Figure 6As shown, the surface of the second housing 228 facing the first housing 227 has a second outer ring convex column 2283. The second outer ring convex column 2283 is a hollow structure. The first outer ring convex column 2272 and the second outer ring convex column 2283 are spliced, and their hollow structures define an outer ring gas passage 2201. In this way, the outer ring gas passage 2201 is defined by the first outer ring convex column 2272 and the second outer ring convex column 2283, so that the outer ring gas passage 2201 can be isolated from the air duct cavity 221, and the internal spaces of the first outer ring convex column 2272 and the second outer ring convex column 2283 are independent. The gas and the supplementary air flow independently of each other. Thus, under the condition of ensuring the normal use of the combustion device 200, the structure of the air duct system 220 can be simplified.

[0087] According to some embodiments of the present invention, as Figure 3 and Figure 4 shown, the first housing 227 is provided with spaced ribs 2273 and a central air passage 222. The central air passage 222 penetrates the first housing 227 and communicates with the air duct cavity 221. The air in the air duct cavity 221 can flow through the central air passage 222 to the burner cap assembly 100 to supplement air for the burner cap assembly 100. The central air passages 222 are multiple and spaced apart. The multiple central air passages 222 are arranged in a circle. The spaced ribs 2273 are in a cylindrical shape. The spaced ribs 2273 are sleeved inside the inner ring of the first air supplement groove 224, and the multiple central air passages 222 are distributed inside the spaced ribs 2273.

[0088] See Figure 3 shown, an inner ring gas groove 2274 is defined between the spaced ribs 2273 and the first limiting rib 223 located in the inner ring. The inner ring gas groove 2274 is adapted to supply gas to the central flame holes 114 of the burner cap assembly 100. An independent inner ring gas passage 2202 is provided in the air duct cavity 221. One end of the inner ring gas passage 2202 penetrates the second housing 228 and communicates with the inner ring intake pipe 214 of the burner 210, and the other end penetrates the first housing 227 and communicates with the inner ring gas groove 2274.

[0089] See Figure 3 shown, the first air supplement groove 224 is sleeved outside the spaced ribs 2273. An inner ring gas groove 2274 is provided between the first air supplement groove 224 and the spaced ribs 2273. The multiple central air passages 222 are all located radially inside the annular spaced ribs 2273. In this way, the central air passages 222 can supplement air to the inner ring gas groove 2274 from the radial inside to the radial outside, and the first air supplement groove 224 supplements air to the inner ring gas groove 2274 from the radial outside to the radial inside. Thus, the gas in the inner ring gas passage 2202 can be fully burned in the combustion area, and further the thermal conversion rate of the combustion device 200 can be improved.

[0090] According to some embodiments of the present invention, there are multiple inner-ring gas channels 2202, and the multiple inner-ring gas channels 2202 are evenly distributed on the same circle. In this way, the gas can be evenly distributed in the inner-ring gas groove 2274, thereby improving the flame stability. In the circumferential direction of the first limiting rib 223, the inner-ring gas channels 2202 are strip-shaped. As Figure 3 shown, the strip-shaped structure has a relatively large flow cross-section, so that the inner-ring gas channels 2202 can provide sufficient gas for the burner head assembly 100, and thus the performance of the combustion device 200 can be improved.

[0091] For example, referring to Figure 2 shown, the burner head 210 is provided with an inner-ring air inlet cavity 216, and the inner-ring air inlet cavity 216 is communicated with the inner-ring gas channels 2202 and the inner-ring air inlet pipe 214. The gas entering the inner-ring air inlet cavity 216 through the inner-ring air inlet pipe 214 can enter the inner-ring gas channels 2202 through the inner-ring air inlet cavity 216, so as to provide gas for the burner head assembly 100.

[0092] Referring to Figure 5 and Figure 6 shown, according to some embodiments of the present invention, the surface of the first housing 227 facing the second housing 228 has a first inner-ring convex column 2275, and the first inner-ring convex column 2275 is a hollow structure; the surface of the second housing 228 facing the first housing 227 has a second inner-ring convex column 2284, and the second inner-ring convex column 2284 is a hollow structure. The first inner-ring convex column 2275 and the second inner-ring convex column 2284 are spliced, and their hollow structures define the inner-ring gas channels 2202. In this way, the inner-ring gas channels 2202 are defined by the first inner-ring convex column 2275 and the second inner-ring convex column 2284, so that the inner-ring gas channels 2202 can be isolated from the air duct cavity 221, and the internal spaces of the first inner-ring convex column 2275 and the second inner-ring convex column 2284 are independent. The gas and the supplementary air flow independently of each other. Thus, under the condition of ensuring the normal use of the combustion device 200, the structure of the air duct system 220 can be simplified.

[0093] According to some embodiments of the present invention, referring to Figure 11 and Figure 6As shown, a part of the surface of the second housing 228 facing the first housing 227 is concave to define a buffer chamber 2203. The buffer chamber 2203 communicates with the air duct chamber 221, and the air outlet end of the fan 230 communicates with the buffer chamber 2203. It should be noted that the fan 230 drives the air flow into the buffer chamber 2203. The air flow enters the air duct chamber 221 after primary buffering and pressure reduction in the buffer chamber 2203, and the air flow can be further decompressed and buffered in the air duct chamber 221. At the same time, the air flow can be evenly distributed in the air duct chamber 221, so that the air flow can be supplemented into the combustion area more smoothly and stably, thereby improving the flame stability of the combustion device 200.

[0094] According to some embodiments of the present invention, referring to Figure 11 and Figure 2 As shown, the air duct system 220 further includes a mounting bracket 231. The fan 230 is connected to the second housing 228 through the mounting bracket 231. The mounting bracket 231 provides a stable support structure for the fan 230, enabling the fan 230 and the second housing 228 to be effectively installed together and ensuring its normal operation. By connecting the fan 230 to the second housing 228 through the mounting bracket 231, the fan 230 can form a complete system. At the same time, this connection method also helps with maintenance and repair work, making the inspection of the internal components of the fan 230 more convenient.

[0095] In some examples, the mounting bracket 231 can be made of sheet metal. The first housing 227 and the second housing 228 can also be made of metal parts. The sheet metal part, the first housing 227, and the second housing 228 all belong to metal parts, and their thermal conductivity coefficients are the same. This can effectively prevent heat from being transferred to the fan 230, so that the fan 230 can stably drive the air flow. The fan 230 is installed on the side of the second housing 228. The lower part of the air duct system 220 is connected to the burner head 210, and the burner head 210 is composed of an inner and outer injection pipe (that is, the outer ring intake pipe 213 and the inner ring intake pipe 214). The upper part of the air duct system 220 is the burner cap assembly 100. During the combustion process, part of the heat of the flame will conduct and radiate heat to the air duct system 220. This part of the heat can heat the air in the air duct chamber 221. At this time, the air in the air duct chamber 221 receives this part of the heat and then participates in combustion, thereby improving the thermal efficiency of the combustion device 200, and the heat is reused.

[0096] According to some embodiments of the present invention, referring to Figure 1 and Figure 2As shown, the mounting bracket 231 may include a fitting portion 232 and a supporting portion 234 connected to the fitting portion 232. The fitting portion 232 is fitted and fixedly connected to the second housing 228. A hollow portion 233 is provided on the fitting portion 232. The air outlet end of the blower 230 passes through the hollow portion 233 to communicate with the air duct cavity 221. The blower 230 is fixedly connected to the supporting portion 234. In this way, the installation stability of the blower 230 can be further improved.

[0097] To improve the airtightness of the air duct cavity 221, according to some embodiments of the present invention, refer to Figure 5 and Figure 6 As shown, the surface of the first housing 227 facing the second housing 228 has a first step portion 2276, the first step portion 2276 extends along the circumferential direction of the first housing 227, the surface of the second housing 228 facing the first housing 227 has a second step portion 2285, the second step portion 2285 extends along the circumferential direction of the second housing 228, and the second step portion 2285 is in sealing fit with the first step portion 2276. It should be noted that by using the step structure to fit with each other, the sealing performance of the two can be improved, so that the airflow can be directed to flow to the burner cap assembly 100.

[0098] According to some embodiments of the present invention, at least one of the first housing 227 and the second housing 228 is a casting or a die casting. Casting or die casting has the advantages of low manufacturing cost and good structural strength. In some embodiments, both the first housing 227 and the second housing 228 can be aluminum alloy die castings.

[0099] The combustion device 200 according to an embodiment of the present invention includes a burner head 210, a burner cap assembly 100, and the air duct system 220 as described above.

[0100] Specifically, the air duct system is connected between the burner cap assembly 100 and the burner head 210. Refer to Figure 2 As shown, the burner head 210 supports the air duct system 220. An ignition pin 211 and a thermocouple 212 are provided on the burner head 210. The ignition pin 211 and the thermocouple 212 are spaced apart on the burner head 210. The ignition pin 211 passes through the air duct system 220 and the burner cap assembly 100, and the thermocouple 212 also passes through the air duct system 220 and the burner cap assembly 100. The free end of the ignition pin 211 is disposed opposite to the central flame hole 114 of the burner cap assembly 100 to facilitate improving the probability of successful ignition.

[0101] Refer to Figure 1 and Figure 2As shown, the burner cap assembly 100 includes a central burner cap 110 and an outer ring burner cap 120. Specifically, the central burner cap 110 is provided with a first central air supplement hole 112, a second central air supplement hole 113, and central burner holes 114. It should be noted that there are multiple central burner holes 114, and the multiple central burner holes 114 are arranged in a circular distribution on the central burner cap 110, that is, the central burner holes 114 are distributed around the central axis of the central burner cap 110. Here, it should also be noted that the central burner holes 114 include multiple large burner holes and multiple small burner holes, and the multiple large burner holes and multiple small burner holes are staggered. The mixed gas of gas and air can enter the central burner holes 114 and burn at the central burner holes 114.

[0102] To make the combustion device 200 have a better combustion effect, it is necessary to ensure sufficient oxygen supply, the temperature reaches above the ignition point, and the fuel stays in the combustion device 200 for enough time to complete the chemical reaction in the combustion device 200. In order to make the gas burn fully, it is necessary to use the secondary air supplement channel to supplement air to the central burner holes 114. For example, in this embodiment, the first central air supplement hole 112 is used to supplement air to the central burner holes 114, that is, air can flow through the first central air supplement hole 112 to the central burner holes 114. When the gas at the central burner holes 114 burns, the air in the first central air supplement hole 112 can be used as the supplementary gas for the combustion flame, so that the gas can burn fully.

[0103] Combined Figure 1 and Figure 7 As shown, the outer ring burner cap 120 is sleeved outside the central burner cap 110. The outer ring burner cap 120 and the central burner cap 110 cooperate to jointly support the cookware and provide heat for the cookware. See Figure 7 As shown, the outer ring burner cap 120 is provided with outer ring burner holes 121. The fire outlet points of the outer ring burner holes 121 are located on the outer circle of the central burner holes 114. After the outer ring burner holes 121 and the central burner holes 114 cooperate, the heat of the combustion device 200 can be adjusted. In some examples, the outer ring burner holes 121 include multiple large burner holes and multiple small burner holes, and the multiple large burner holes and multiple small burner holes are staggered. The mixed gas of gas and air can enter the outer ring burner holes 121 and burn at the outer ring burner holes 121.

[0104] See Figure 7 and Figure 8As shown, the second central air supplement hole 113 is used to supplement air to the outer ring flame holes 121, and the outer ring flame holes 121 are distributed around the central axis of the central burner cap 110. It should be noted that the outer ring flame holes 121 are located on the outer circle of the central flame holes 114. In the radial direction of the central axis, the first central air supplement hole 112 and the second central air supplement hole 113 are located between the outer ring flame holes 121 and the central flame holes 114. The first central air supplement hole 112 is used to supplement air to the central flame holes 114 on its radial inner side, and the second central air supplement hole 113 is used to supplement air to the outer ring flame holes 121 on its radial outer side. In this way, both the central flame holes 114 and the outer ring flame holes 121 can burn fully.

[0105] According to some embodiments of the present invention, as Figure 10 and Figure 12 shown, in the extending direction of the central axis, the central flame holes 114 and the outer ring flame holes 121 are spaced apart. Compared with the central flame holes 114, the outer ring flame holes 121 are closer to the cookware. In this way, in the extending direction of the central axis, the central flame holes 114 and the outer ring flame holes 121 are staggered in space, so that the flames at the central flame holes 114 and the outer ring flame holes 121 can be in full contact with air, thereby enabling the gas to burn fully and improving the heat conversion rate during gas combustion.

[0106] Refer to Figure 10 and Figure 12 shown, according to some embodiments of the present invention, in the extending direction of the central axis, the central flame holes 114 and the first central air supplement hole 112 are spaced apart. Compared with the central flame holes 114, the first central air supplement hole 112 is closer to the cookware. Air supplement is to increase the oxygen supply in the combustion device 200, thereby promoting the full combustion of the fuel. In the combustion device 200, the first central air supplement hole 112 can play a role in directional air supplement.

[0107] When air flows out through the first central air supplement hole 112, it can flow from the radial outer side of the central flame holes 114 to the central flame holes 114. The purpose of this design is to form an air flow around the central flame holes 114 and guide oxygen to the fuel area near the central flame holes 114, achieving the purpose of directional air supplement. Through directional air supplement, the fuel can be in better contact with oxygen, providing a more sufficient oxygen supply and promoting the progress of the combustion reaction. This helps to improve the combustion efficiency and heat release capacity of the fuel, so that the combustion device 200 has a better combustion effect.

[0108] Refer to Figure 10 and Figure 12As shown, according to some embodiments of the present invention, in the extending direction of the central axis, the outer ring flame holes 121 and the second central air supplement holes 113 are spaced apart. Compared with the second central air supplement holes 113, the outer ring flame holes 121 are closer to the cookware. In the combustion device 200, the second central air supplement holes 113 can play a role in directional air supplement. Specifically, when air flows out through the second central air supplement holes 113, it can flow from the radially inner side of the outer ring flame holes 121 to the outer ring flame holes 121. The purpose of such a design is to form an air flow around the outer ring flame holes 121 and guide oxygen to the fuel area near the outer ring flame holes 121, achieving the purpose of directional and precise air supplement. Through directional air supplement, the fuel can better contact with oxygen, providing a more sufficient oxygen supply and promoting the combustion reaction. This helps to improve the combustion efficiency and heat release capacity of the fuel, so that the combustion device 200 has a better combustion effect.

[0109] According to some embodiments of the present invention, referring to Figure 10 and Figure 12 As shown, the central burner cap 110 is provided with a central air hole 115. In the extending direction of the central axis, the central flame holes 114 and the central air hole 115 are spaced apart. Compared with the central air hole 115, the central flame holes 114 are closer to the cookware. The central air hole 115 is used to supplement air to the central flame holes 114. When air flows out through the central air hole 115, it can flow from the radially inner side of the central flame holes 114 to the combustion area of the central flame holes 114. The purpose of such a design is to form an air flow around the central flame holes 114 and guide oxygen to the fuel area near the central flame holes 114, achieving the purpose of directional and precise air supplement.

[0110] It should be noted that in some examples of the present application, in the extending direction of the central axis, the first central air supplement holes 112, the central flame holes 114, and the central air holes 115 are sequentially spaced apart. The central air holes 115 include a plurality of small hole structures and the plurality of small holes are arranged in a ring; the central flame holes 114 include a plurality of small hole structures and the plurality of small holes are arranged in a ring. The area where the central flame holes 114 are distributed covers the area where the central air holes 115 are located. In this way, after the gas discharged from the central flame holes 114 is ignited, a ring-shaped flame can be formed on the combustion device 200, so as to have a better heating effect on the object to be heated; the first central air supplement holes 112 also include a plurality of small hole structures and the plurality of small hole structures are arranged in a ring, and the area where the first central air supplement holes 112 are distributed covers the area where the central flame holes 114 are located.

[0111] In this way, in the direction of the central axis towards its radially inner side, the first central air supplement hole 112, the central flame hole 114, and the central air hole 115 are arranged in sequence. The first central air supplement hole 112 can supplement air to the central flame hole 114 from the radially outer side of the central flame hole 114, and the central air hole 115 can supplement air to the central flame hole 114 from the radially inner side of the central flame hole 114. It can be understood that both the first central air supplement hole 112 and the central air hole 115 can supplement air to the central flame hole 114 in a directional manner. The purpose of such a design is to form an air supplement airflow on both the radially inner side and the radially outer side of the central flame hole 114. Both the first central air supplement hole 112 and the central air hole 115 can direct oxygen to the fuel area near the central flame hole 114, achieving the purpose of directional and precise air supplement.

[0112] It should be noted that within the space defined by the axial direction and the radial direction of the central axis, the first central air supplement hole 112 and the central air hole 115 can supplement air to the central flame hole 114 in a directional manner from multiple directions. For example, the first central air supplement hole 112 can supplement air to the central flame hole 114 from top to bottom and from outside to inside; the central air hole 115 can supplement air to the central flame hole 114 from bottom to top and from inside to outside. In this way, a multi-directional air supplement airflow is formed around the central flame hole 114, guiding oxygen to the fuel area near the central flame hole 114, achieving the purpose of directional and precise air supplement, enabling the gas to burn fully at the central flame hole 114, and improving the gas heat conversion efficiency.

[0113] According to some embodiments of the present invention, referring to Figure 10 and Figure 12 As shown, the outer ring burner cap 120 is provided with outer ring air holes 122. In the extending direction of the central axis, the outer ring flame holes 121 and the outer ring air holes 122 are distributed at intervals. Compared with the outer ring flame holes 121, the outer ring air holes 122 are closer to the cookware. The outer ring air holes 122 are used to supplement air to the outer ring flame holes 121. When the air flows out through the outer ring air holes 122, it can flow from the radially outer side of the outer ring flame holes 121 to the combustion area of the outer ring flame holes 121. The purpose of such a design is to form an air current around the outer ring flame holes 121 and guide oxygen to the fuel area near the outer ring flame holes 121, achieving the purpose of directional and precise air supplement.

[0114] It should be noted that in some embodiments of the present application, in the extending direction of the central axis, the outer ring air holes 122, the outer ring flame holes 121, and the second central air supplement hole 113 are sequentially spaced apart. The outer ring air holes 122 include a plurality of small hole structures and the plurality of small holes are arranged in a ring shape; the outer ring flame holes 121 include a plurality of small hole structures and the plurality of small holes are arranged in a ring shape. The area where the outer ring air holes 122 are distributed covers the area where the outer ring flame holes 121 are located. In this way, after the gas discharged from the outer ring flame holes 121 is ignited, a ring-shaped flame can be formed on the combustion device 200, so as to have a better heating effect on the object to be heated; the second central air supplement hole 113 also includes a plurality of small hole structures and the plurality of small hole structures are arranged in a ring shape, and the area where the second central air supplement hole 113 is distributed is sleeved inside the area where the outer ring flame holes 121 are located.

[0115] In this way, in the direction of the central axis towards its radial inner side, the outer ring air holes 122, the outer ring flame holes 121, and the second central air supplement hole 113 are sequentially arranged. The second central air supplement hole 113 can supplement air to the outer ring flame holes 121 from the radial inner side of the outer ring flame holes 121, and the outer ring air holes 122 can supplement air to the outer ring flame holes 121 from the radial outer side of the outer ring flame holes 121. It can be understood that both the second central air supplement hole 113 and the outer ring air holes 122 can supplement air to the outer ring flame holes 121 directionally. The purpose of such a design is that air supplement airflows are formed on both the radial inner side and the radial outer side of the outer ring flame holes 121. Both the second central air supplement hole 113 and the outer ring air holes 122 can direct oxygen to the fuel area near the outer ring flame holes 121, achieving the purpose of directional and precise air supplement.

[0116] It should be noted that within the space defined by the axial direction and the radial direction of the central axis, the second central air supplement hole 113 and the outer ring air holes 122 can supplement air to the outer ring flame holes 121 directionally from multiple directions. For example, the second central air supplement hole 113 can supplement air to the outer ring flame holes 121 from bottom to top and from inside to outside, and the outer ring air holes 122 can supplement air to the outer ring flame holes 121 from top to bottom and from outside to inside. In this way, a multi-directional air supplement airflow is formed around the outer ring flame holes 121, guiding oxygen to the fuel area near the central flame holes 114, achieving the purpose of directional and precise air supplement, enabling the gas to burn fully at the outer ring flame holes 121, and improving the gas heat conversion efficiency.

[0117] See Figure 8 、 Figure 9 and Figure 12As shown, according to some embodiments of the present invention, in the radial direction of the central axis, the central flame hole 114, the first central air supplement hole 112, the second central air supplement hole 113, and the outer ring flame hole 121 are arranged in sequence along the radially outer direction of the central axis. In this way, there is directional air supplement in the up and down, radial inner and outer directions of the outer ring flame hole 121 and the central flame hole 114, thereby achieving the purpose of directional and precise air supplement, enabling the gas to burn fully at the outer ring flame hole 121 and improving the gas heat conversion efficiency.

[0118] According to some embodiments of the present invention, referring to Figure 8 and Figure 12 As shown, a first air supplement channel 111 is provided on the central flame cover 110, and the first air supplement channel 111 is communicated with both the first central air supplement hole 112 and the second central air supplement hole 113. It can be understood that the first air supplement channel 111 can provide air flow for both the first central air supplement hole 112 and the second central air supplement hole 113 at the same time, which can simplify the structure of the central flame cover 110 and enable the central flame cover 110 to have the function of supplementing air to both the central flame hole 114 and the outer ring flame hole 121.

[0119] In order to improve the air supplement structure of the flame cover assembly 100 and make more air supplement to the outer ring flame hole 121, according to some embodiments of the present invention, referring to Figure 8 , Figure 9 and Figure 12 As shown, there is an assembly gap 123 between the outer circle of the central flame cover 110 and the inner circle of the outer ring flame cover 120. The assembly gap 123 is communicated with the first air supplement channel 111, the assembly gap 123 is opposite to the outer ring flame hole 121, and the assembly gap 123 is used to supplement air to the outer ring flame hole 121. In the extending direction of the central axis, the central flame hole 114 and the assembly gap 123 are spaced apart. Compared with the assembly gap 123, the central flame hole 114 is closer to the cookware. In this way, the assembly gap 123 can also supplement air to the outer ring flame hole 121. At the same time, the assembly gap 123 can also supplement air to the outer ring flame hole 121 from bottom to top and from inside to outside, so that the gas at the outer ring flame hole 121 can burn fully.

[0120] Referring to Figure 7 and Figure 2As shown, the air duct cavity 221 is in communication with both the first central air supply hole 112 and the second central air supply hole 113. It should be noted that the air in the air duct cavity 221 can flow towards the first central air supply hole 112 and the second central air supply hole 113. That is to say, ensuring sufficient oxygen content around the combustion area is the key to maintaining a stable flame. The air duct cavity 221 can serve as the air storage space for the first central air supply hole 112 and the second central air supply hole 113, so as to provide a stable air flow for the first central air supply hole 112 and the second central air supply hole 113, thereby providing a stable air supply for the burner holes, enabling the combustion flame at the burner head assembly 100 to remain stable, and at the same time enabling the gas to burn fully.

[0121] Furthermore, referring to Figure 2 As shown, the fan 230 is used to drive the air flow in the air duct cavity 221 to flow towards the first central air supply hole 112 and the second central air supply hole 113 of the burner head assembly 100. The fan 230 can serve as the power to drive the air flow, so that the air flow can stably flow from the air duct cavity 221 to the first central air supply hole 112 and the second central air supply hole 113, providing a stable oxygen source for fuel combustion. By reasonably designing the structure of the combustion device 200 and optimizing the flow path and speed of the air flow, the air flow at the flame can be kept stable, which helps the flame to burn stably.

[0122] In addition, it should also be noted that the air in the combustion area on the burner head assembly 100 can be supplemented by the air duct system 220, and the air in the air duct system 220 can be driven to flow by the fan 230. Sufficient air supply enables the gas to burn fully. The air duct system 220 is located below the burner head assembly 100. During the combustion process, part of the heat of the flame will conduct and radiate heat to the air duct system 220, and this part of the heat is also the heat lost by the combustion device 200 and cannot be utilized by the cookware. After the combustion is stable, the air temperature in the air duct cavity 221 can reach above 200 °C. At this time, the air in the air duct cavity 221 receives part of the heat lost by the combustion device 200 and participates in combustion again, thereby improving the thermal efficiency of the combustion device 200, and the heat can be reused.

[0123] Referring to Figure 1As shown, the gas stove provided by the embodiment of the present invention includes the combustion device 200 as described above. It should be noted that the air in the combustion area on the burner head assembly 100 can be supplemented by the air duct system 220, and the air in the air duct system 220 can be driven to flow by the fan 230. Sufficient air supply can enable the gas to burn fully. The air duct system 220 is located below the burner head assembly 100. During the combustion process, part of the heat of the flame will conduct and radiate heat to the air duct system 220. Moreover, this part of the heat is also the heat lost by the combustion device 200 and cannot be utilized by the cookware. After the combustion is stable, the air temperature in the air duct cavity 221 can reach above 200°C. At this time, the air in the air duct cavity 221 receives part of the heat lost by the combustion device 200 and participates in the combustion again, thereby improving the thermal efficiency of the combustion device 200, and the heat can be reused.

[0124] Finally, it should be noted that the above embodiments are only used to illustrate the present invention, rather than to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, those of ordinary skill in the art should understand that various combinations, modifications or equivalent replacements of the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention, and should all be covered by the scope of the claims of the present invention.

Claims

1. An air duct system for a combustion device, characterized in that: include: A first shell and a second shell that are engaged with each other, wherein the first shell and the second shell define an air duct cavity, and the first shell is used to connect a fire cover assembly; A fan is connected to the second shell, and is used to drive air flow from the air duct cavity to the fire cover assembly to provide secondary air supply for the fire cover assembly.

2. The air duct system of the combustion device according to claim 1, characterized in that: The first shell is provided with a plurality of first air holes, each of which is connected to the air duct cavity; Two spaced-apart first limiting ribs are provided on the side of the first shell facing away from the second shell, each of the first limiting ribs is annular, and a first air-supplying groove is constructed between the two first limiting ribs. The first air-supplying groove is connected to the air duct cavity through the first air hole, and a plurality of the first air holes are spaced apart and distributed on the bottom wall of the first air-supplying groove.

3. The air duct system of the combustion device according to claim 2, characterized in that: The first shell is provided with a plurality of second air holes, each of which is in communication with the air duct cavity; Two spaced-apart second limiting ribs are provided on the side of the first shell facing away from the second shell, a second air-supplying groove is constructed between the two second limiting ribs, the second air-supplying groove is sheathed outside the first air-supplying groove, the second air-supplying groove is connected to the air duct cavity through the second air holes, and a plurality of the second air holes are spaced apart and distributed on the bottom wall of the second air-supplying groove.

4. The air duct system of the combustion device according to claim 3, characterized in that: An outer ring gas groove is defined between the second limiting rib located on the inner ring and the first limiting rib located on the outer ring, and the outer ring gas groove is suitable for supplying gas to the outer ring fire hole of the fire cover assembly; An independent outer ring gas channel is provided in the air duct cavity, one end of the outer ring gas channel passes through the second shell and is connected to the outer ring air inlet pipe of the burner head, and the other end passes through the first shell and is connected to the outer ring gas groove.

5. The air duct system of the combustion device according to claim 4, characterized in that: There are multiple outer ring gas channels, and the multiple outer ring gas channels are evenly distributed on the same circle; In the circumferential direction of the first limiting rib, the outer ring gas channel is in a long strip shape.

6. The air duct system of the combustion device according to claim 4, characterized in that: The surface of the first shell facing the second shell has a first outer ring protrusion, and the first outer ring protrusion is a hollow structure. The surface of the second shell facing the first shell has a second outer ring boss, the second outer ring boss is a hollow structure, the first outer ring boss and the second outer ring boss are spliced, and the hollow structures of the two define the outer ring gas channel.

7. The air duct system of the combustion device according to claim 2, characterized in that: The first shell is provided with a spacing rib and a central air duct, the central air duct runs through the first shell and is connected to the air duct cavity, the central air duct is multiple and spaced apart, the multiple central air ducts are arranged in a circular shape, the spacing rib is cylindrical, the spacing rib is internally sleeved in the inner ring of the first air replenishing groove, and the multiple central air ducts are distributed on the inner side of the spacing rib.

8. The air duct system of the combustion device according to claim 7, characterized in that: An inner ring gas groove is defined between the spacing rib and the first limiting rib located on the inner ring, and the inner ring gas groove is suitable for supplying gas to the central fire hole of the fire cover assembly; An independent inner ring gas channel is provided in the air duct cavity, one end of the inner ring gas channel passes through the second shell and is connected to the inner ring air inlet pipe of the burner head, and the other end passes through the first shell and is connected to the inner ring gas groove.

9. The air duct system of the combustion device according to claim 8, characterized in that: There are multiple inner ring gas channels, and the multiple inner ring gas channels are evenly distributed on the same circle; In the circumferential direction of the first limiting rib, the inner ring gas channel is in a long strip shape.

10. The air duct system of the combustion device according to claim 8, characterized in that: The surface of the first shell facing the second shell has a first inner ring protrusion, and the first inner ring protrusion is a hollow structure. The surface of the second shell facing the first shell has a second inner ring boss, the second inner ring boss is a hollow structure, the first inner ring boss and the second inner ring boss are spliced, and the hollow structures of the two define the inner ring gas channel.

11. The air duct system of a combustion device according to any one of claims 1 to 10, characterized in that: A portion of the surface of the second shell facing the first shell is concave to define a buffer cavity, the buffer cavity is communicated with the air duct cavity, and the air outlet end of the fan is communicated with the buffer cavity.

12. The air duct system of a combustion device according to any one of claims 1 to 10, characterized in that: It also includes a mounting frame, and the fan is connected to the second shell through the mounting frame.

13. The air duct system of the combustion device according to claim 12, characterized in that: The mounting frame includes a fitting portion and a supporting portion connected to the fitting portion, the fitting portion is fitted and fixedly connected to the second shell, a hollow portion is provided on the fitting portion, and an air outlet end of the fan is passed through the hollow portion to communicate with the air duct cavity. The fan is fixedly connected to the supporting part.

14. The air duct system of a combustion device according to any one of claims 1 to 10, characterized in that: The surface of the first shell facing the second shell has a first step portion, the first step portion extends along the circumferential direction of the first shell, the surface of the second shell facing the first shell has a second step portion, the second step portion extends along the circumferential direction of the second shell, and the second step portion is sealed and matched with the first step portion.

15. The air duct system of a combustion device according to any one of claims 1 to 10, characterized in that: At least one of the first housing and the second housing is a casting or a die-casting.

16. A combustion device, characterized in that: include: stove top; An air duct system, wherein the air duct system is an air duct system according to any one of claims 1 to 15; The fire cover assembly, the air duct system is connected between the fire cover assembly and the burner head, The fire cover assembly comprises: A central fire cover, wherein the central fire cover is provided with a first central air supply hole, a second central air supply hole and a central fire hole, wherein the first central air supply hole is used to supply air to the central fire hole, and the central fire holes are distributed around the central axis of the central fire cover; An outer ring fire cover, the outer ring fire cover is placed outside the central fire cover, the outer ring fire cover is provided with an outer ring fire hole, the second central air supply hole is used to supply air to the outer ring fire hole, and the outer ring fire holes are distributed around the central axis of the central fire cover. Wherein, the first central air supply hole and the second central air supply hole are both connected to the air duct cavity.

17. The combustion device according to claim 16, characterized in that: The central fire cover is provided with a first air supply channel, and the first air supply channel is connected with both the first central air supply hole and the second central air supply hole.

18. A gas stove, characterized in that: Comprising a combustion device according to claim 16 or 17.

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