Air duct structure, combustion device, combustion system and gas equipment

Abstract

The invention relates to an air duct structure, a combustion device, a combustion system and fuel gas equipment. In the combustion process, combustion-supporting gas can be introduced into a gas inlet piece; and meanwhile, fuel gas is introduced into the gas inlet piece and / or the mixing chamber, so that the combustion-supporting gas and the fuel gas can be at least mixed in the mixing chamber. And the mixed gas can flow into the combustor from the mixing chamber for combustion, so that stable combustion is realized. Due to the fact that the air inlet piece and the mixing chamber are of the integrated structure, on the premise that stable combustion is achieved, the number of parts of the air channel structure is reduced, the structure is simplified, and assembling is convenient.

Description

Technical Field

[0001] The present application relates to the technical field of gas appliances, in particular to an air duct structure, a combustion device, a combustion system and a gas equipment. Background Art

[0002] A gas water heater is a small thermal device that uses the heat released by gas combustion to heat domestic water to the required temperature through a heat exchanger. It has the advantages of high efficiency, fast water output, stable water temperature adjustment, and continuous use, etc. It has become the first choice for people's hot water products, and small-sized and low-emission gas water heaters have gradually become a new market demand.

[0003] Most traditional burners adopt diffusion combustion, atmospheric combustion and premixed combustion, and the combustion chamber provides the space required for combustion. In existing gas water heaters, atmospheric combustion and premixed combustion are mainly separate combustions, and their air duct structures have their own emphases. However, they have a large number of parts, a complex system structure, and a great assembly difficulty. Summary of the Invention

[0004] Based on this, it is necessary to provide an air duct structure, a combustion device, a combustion system and a gas equipment, which reduce the number of parts of the air duct structure, have a simple structure and are easy to assemble.

[0005] An air duct structure, the air duct structure includes: a mixing chamber for communicating with a burner; an air inlet member communicating with the mixing chamber, and one end of the air inlet member away from the mixing chamber is used for introducing combustion-supporting gas, and at least one of the mixing chamber and the air inlet member is used for introducing gas; wherein, the mixing chamber and the air inlet member are of an integrated structure.

[0006] In the above air duct structure, during the combustion process, combustion-supporting gas can be introduced into the air inlet member; at the same time, gas is introduced into the air inlet member and / or the mixing chamber, so that the combustion-supporting gas and the gas can be mixed at least in the mixing chamber. The mixed gas can flow into the burner from the mixing chamber for combustion. In this way, stable combustion is achieved. Since the air inlet member and the mixing chamber are of an integrated structure, therefore, on the premise of achieving stable combustion, the number of parts of the air duct structure is reduced, the structure is simplified, and it is convenient for assembly.

[0007] In some embodiments, the air duct structure includes a first housing and a second housing, the first housing includes a first mixing part and a first air inlet part, and the second housing includes a second mixing part and a second air inlet part; the first housing and the second housing are hermetically connected so that the first mixing part and the second mixing part form the mixing chamber, and the first air inlet part and the second air inlet part form the air inlet member; wherein, the first mixing part and the first air inlet part are of an integrated structure; and / or, the second mixing part and the second air inlet part are of an integrated structure.

[0008] In some of these embodiments, among the two mating surfaces of the first housing and the second housing facing each other, a positioning protrusion is provided on one of them, and a positioning groove for inserting the positioning protrusion is provided on the other.

[0009] In some of these embodiments, the air inlet member includes a gas mixing section and a gas blowing section communicating with the gas mixing section. One end of the gas mixing section away from the gas blowing section communicates with the mixing chamber. The gas blowing section is used for introducing the combustion-supporting gas, and at least one of the gas mixing section and the gas blowing section is used for introducing the fuel gas.

[0010] In some of these embodiments, the air inlet member further includes a diffusing section communicating between the gas mixing section and the gas blowing section. The cross-sectional area of the diffusing section gradually increases from the end connected to the gas blowing section to the end connected to the gas mixing section.

[0011] In some of these embodiments, the gas blowing section includes a first part and a second part connected in sequence. The second part communicates with the gas mixing section through the first part. The second part is used for inputting the fuel gas, and the end of the second part away from the first part is used for introducing the combustion-supporting gas; wherein, the first part is bent relative to the second part.

[0012] In some of these embodiments, the gas blowing section includes a first part and a second part connected in sequence. The second part communicates with the diffusing section through the first part. The second part is used for inputting the fuel gas, and the end of the second part away from the first part is used for introducing the combustion-supporting gas; wherein, the first part is bent relative to the second part.

[0013] In some of these embodiments, the part where the first part and the second part are connected is an arc-shaped bending structure. The bending angle between the first part and the second part is denoted as θ, where 80° ≤ θ ≤ 100°.

[0014] In some of these embodiments, the air duct structure further includes a turbulator provided in the gas mixing section and used for mixing the fuel gas and the combustion-supporting gas in the gas mixing section.

[0015] In some of these embodiments, the turbulator includes blades. Grooves are provided on the inner wall of the gas mixing section, and at least part of the blades are stuck into the grooves.

[0016] In some of these embodiments, the gas mixing section is configured as a straight-line segment structure. The length of the gas mixing section is denoted as L, and the distance between the end of the turbulator close to the mixing chamber and the end of the gas mixing section close to the mixing chamber is denoted as D, where D / L ≤ 1 / 3.

[0017] In some of these embodiments, the mixing chamber extends along a preset direction, and an outlet end of the air inlet member communicating with the mixing chamber is disposed at one end of the mixing chamber along the preset direction.

[0018] A combustion device, the combustion device includes: a burner; a duct structure as described in any one of the above, the burner is disposed on a side of the mixing chamber away from the air inlet member and communicates with the mixing chamber.

[0019] For the above-mentioned combustion device, with the above duct structure, during the combustion process, a combustion-supporting gas can be introduced into the air inlet member; at the same time, a fuel gas is introduced into the air inlet member and / or the mixing chamber, so that the combustion-supporting gas and the fuel gas can be mixed at least in the mixing chamber. The mixed gas can flow from the mixing chamber into the burner for combustion, thus achieving stable combustion. Since the air inlet member and the mixing chamber are an integrated structure, on the premise of achieving stable combustion, the number of parts of the duct structure is reduced, the structure is simplified, and assembly is facilitated.

[0020] In some of these embodiments, the combustion device further includes a first gas delivery member and a second gas delivery member, the first gas delivery member communicates with the air inlet member, and the second gas delivery member communicates with the burner; wherein, at least one of the first gas delivery member and the second gas delivery member is used to introduce the fuel gas.

[0021] In some of these embodiments, a stepped portion is provided on a side of the mixing chamber away from the burner, an opening groove is provided on the stepped portion, and at least a part of the second gas delivery member is disposed through the opening groove.

[0022] In some of these embodiments, the mixing chamber extends along a preset direction, and the outlet end of the air inlet member communicating with the mixing chamber and the stepped portion are spaced apart along the preset direction of the mixing chamber.

[0023] In some of these embodiments, the burner includes a first combustion module and a second combustion module nested with each other, the first combustion module is provided with at least one first combustion hole, the second combustion module is provided with at least one second combustion hole, one of the first combustion hole and the second combustion hole communicates with the mixing chamber, and the other of the first combustion hole and the second combustion hole communicates with the second gas delivery member.

[0024] In some of these embodiments, the combustion device further includes a control valve, the control valve is respectively connected to the first gas delivery member and the second gas delivery member, and is used to selectively introduce the fuel gas into the first gas delivery member and the second gas delivery member.

[0025] In some of these embodiments, the combustion device further includes a blower, and the blower communicates with an end of the air inlet member away from the mixing chamber.

[0026] In some of these embodiments, the combustion device further includes a control valve and a blower. The mixing chamber extends along a preset direction, and along the preset direction, the air inlet member, the blower, and the control valve are arranged in sequence.

[0027] A combustion system, the combustion system includes the combustion device according to any one of the above.

[0028] A combustion equipment, the combustion equipment includes the combustion device according to any one of the above. Description of the Drawings

[0029] Figure 1 Structural schematic of the air duct structure and the burner in some embodiments of the present application Figure 1 。

[0030] Figure 2 is Figure 1 the structural cross-sectional view shown in

[0031] Figure 3 Structural schematic of the air duct structure and the burner in some embodiments of the present application Figure 2 。

[0032] Figure 4 Schematic diagram of the air duct structure in some embodiments of the present application.

[0033] Figure 5 is Figure 4 the enlarged schematic diagram of the structure at circle A in

[0034] Figure 6 Schematic diagram of the structure of the gas equipment in some embodiments of the present application.

[0035] 100. Air duct structure; 11. Mixing chamber; 111. Opening groove; 112. Step portion; 12. Air inlet member; 121. Gas mixing section; 122. Air blowing section; 12a. First part; 12b. Second part; 123. Diffuser section; 124. Groove; 13. First gas delivery member; 14. Second gas delivery member; 141. Limiting portion; 15. First housing; 151. First mixing portion; 152. First air inlet portion; 16. Second housing; 161. Second mixing portion; 162. Second air inlet portion; 163. Positioning groove; 164. Positioning protrusion; 20. Control valve; 21. Gas component; 30. Blower; 40. Turbulator; 200. Burner; 210. Outer shell; 220. First combustion module; 221. First combustion hole; 222. Second combustion hole; 223. Water cooling member; 224. Second combustion module; 300. Water cooling jacket; 400. Electrical box module; 500. Cold water member; 600. Hot water member; 700. Machine shell; X. Preset direction. Detailed implementation manners

[0036] To make the above objects, features, and advantages of the present application more obvious and understandable, the following will describe the detailed implementation manners of the present application with reference to the accompanying drawings. Many specific details are set forth in the following description 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 departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0037] In the description of the present application, it should be understood that if terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application 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 thus should not be construed as a limitation to the present application.

[0038] In addition, if terms such as "first" and "second" appear, these terms are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0039] In the present application, unless otherwise clearly specified and limited, if terms such as "installation", "connection", "connection", "fixation", etc. appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0040] In this application, unless otherwise clearly defined and limited, if there is a description such as a first feature being "on" or "under" a second feature, its meaning can be 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, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or simply means that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower horizontal height than the second feature.

[0041] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there can also be an intermediate element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. If so, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in this application are only for the purpose of illustration and do not represent the only implementation.

[0042] In some instances, please refer to Figure 1 , this application provides an air duct structure 100, and the air duct structure 100 includes: a mixing chamber 11 and an air inlet member 12. The mixing chamber 11 is used to communicate with a burner 200; the air inlet member 12 is communicated with the mixing chamber 11, and one end of the air inlet member 12 away from the mixing chamber 11 is used to introduce combustion-supporting gas, and at least one of the mixing chamber 11 and the air inlet member 12 is used to introduce fuel gas. Among them, the mixing chamber 11 and the air inlet member 12 are of an integrated structure.

[0043] For the above-mentioned air duct structure 100, during the combustion process, combustion-supporting gas can be introduced into the air inlet member 12; at the same time, fuel gas is introduced into the air inlet member 12 and / or the mixing chamber 11, so that the combustion-supporting gas and the fuel gas can be mixed at least in the mixing chamber 11. The mixed gas can flow from the mixing chamber 11 into the burner 200 for combustion, thus realizing stable combustion. Since the air inlet member 12 and the mixing chamber 11 are of an integrated structure, therefore, on the premise of realizing stable combustion, the number of parts of the air duct structure 100 is reduced, the structure is simplified, and the assembly is facilitated.

[0044] It should be noted that the mixing chamber 11 and the air inlet member 12 being of an integrated structure means that the connection between the mixing chamber 11 and the air inlet member 12 is in an integrally formed manner, such as: it can be but not limited to extrusion, injection molding, die casting, 3D printing, etc. However, the structures of the mixing chamber 11 and the air inlet member 12 themselves can be designed as an integrated structure or a combined structure, such as: connected by bolts, snap connection, pin connection, welding, riveting, etc.

[0045] Among them, the combustion-supporting gas can be but is not limited to air.

[0046] Furthermore, please refer to Figure 4 , the air duct structure 100 includes a first housing 15 and a second housing 16. The first housing 15 includes a first mixing part 151 and a first air inlet part 152, and the second housing 16 includes a second mixing part 161 and a second air inlet part 162. The first housing 15 and the second housing 16 are hermetically connected so that the first mixing part 151 and the second mixing part 161 form a mixing chamber 11, and the first air inlet part 152 and the second air inlet part 162 form an air inlet member 12; wherein, the first mixing part 151 and the first air inlet part 152 are of an integrated structure; and / or, the second mixing part 161 and the second air inlet part 162 are of an integrated structure.

[0047] It can be seen from this that in this embodiment, the integrated structure between the mixing chamber 11 and the air inlet member 12 means that the connection manner between the mixing chamber 11 and the air inlet member 12 is an integral molding manner, and the structures of the mixing chamber 11 and the air inlet member 12 themselves are both combined structures. In this way, on the premise of simplifying the number of structures of the air duct structure 100, the first housing 15 and the second housing 16 are combined, which is convenient for processing or assembling components inside the air duct structure 100.

[0048] It should be noted that the hermetic connection between the first housing 15 and the second housing 16 means that after the first housing 15 and the second housing 16 are mated, the mating junction between the two is in a sealed state to avoid the risk of leakage. Among them, the connection manner between the first housing 15 and the second housing 16 can be but is not limited to bolt connection, clamping connection, riveting connection, welding, etc. Of course, in order to further improve the sealing effect between the first housing 15 and the second housing 16, a sealing rubber can be provided between the first housing 15 and the second housing 16.

[0049] Even further, please refer to Figure 5 , among the two mating surfaces of the first housing 15 and the second housing 16 facing each other, a positioning protrusion 164 is provided on one of them, and a positioning groove 163 for inserting the positioning protrusion 164 is provided on the other. In this way, through the cooperation of the positioning protrusion 164 and the positioning groove 163, the first housing 15 and the second housing 16 are tightly connected, which is beneficial to improving the sealing performance and stability of the air duct structure 100.

[0050] It should be noted that the structures of the positioning groove 163 and the positioning protrusion 164 can have various designs. For example: the positioning groove 163 and the positioning protrusion 164 can be designed as a complete structure. For example: the positioning groove 163 and the positioning protrusion 164 can extend along the circumferential direction of the first housing 15 or the second housing 16; or, the positioning groove 163 and the positioning protrusion 164 can be designed as a multi-segmented and spaced structure along the circumferential direction of the first housing 15 or the second housing 16.

[0051] In some embodiments, referring to Figure 2 , the air intake member 12 includes a gas mixing section 121 and a gas blowing section 122 communicated with the gas mixing section 121. One end of the gas mixing section 121 away from the gas blowing section 122 is communicated with the mixing chamber 11. Combustion-supporting gas is introduced into the gas blowing section 122, and at least one of the gas mixing section 121 and the gas blowing section 122 is used for introducing fuel gas. It can be seen that during premixed combustion, fuel gas is introduced into the gas mixing section 121 and / or the gas blowing section 122, and combustion-supporting gas is blown into the gas blowing section 122, so that the fuel gas and the combustion-supporting gas are mixed for the first time in the gas mixing section 121; after mixing, they uniformly flow into the mixing chamber 11 and are mixed again. Designed in this way, the mixing path of the fuel gas and the combustion-supporting gas can be extended, the air flow is prevented from directly entering the mixing chamber 11, sufficient mixing time of the fuel gas and the combustion-supporting gas is ensured, the mixing between the fuel gas and the combustion-supporting gas is made more uniform, and high-efficiency and low-emission premixed combustion is further realized.

[0052] It should be noted that the gas blowing section 122 and the gas mixing section 121 are communicated, and they can be directly connected. For example, one end of the gas blowing section 122 is directly connected to one end of the gas mixing section 121 and remains communicated; they can also be indirectly connected. For example, one end of the gas blowing section 122 is connected to one end of the gas mixing section 121 through an intermediate structure and remains communicated with the gas blowing section 122 through the intermediate structure.

[0053] It should also be noted that at least one of the gas mixing section 121 and the gas blowing section 122 can introduce fuel gas, which can be understood as: the fuel gas is introduced into the gas mixing section 121; or, the fuel gas is introduced into the gas blowing section 122; or, the fuel gas is introduced into both the gas mixing section 121 and the gas blowing section 122. When the fuel gas is introduced into the gas blowing section 122, the fuel gas and the combustion-supporting gas can be mixed earlier, the mixing path can be extended, the mixing degree of the mixed gas can be improved, and the combustion stability can be ensured.

[0054] Furthermore, the air intake member 12 further includes a diffuser section 123, and the diffuser section 123 is communicated between the gas mixing section 121 and the gas blowing section 122. It can be seen that the gas mixing section 121 and the gas blowing section 122 are indirectly communicated, and the combustion-supporting gas in the gas blowing section 122 enters the gas mixing section 121 through the diffuser section 123. The cross-sectional area of the diffuser section 123 gradually increases from the end connected to the gas blowing section 122 to the end connected to the gas mixing section 121. Therefore, the diffuser section 123 presents an expanded state, the flow rate of the combustion-supporting gas is slowed down, the range of the combustion-supporting gas entering the gas mixing section 121 is expanded, the combustion-supporting gas is dispersed uniformly in the gas mixing section 121, the mixing uniformity with the fuel gas is improved, and the combustion stability is enhanced.

[0055] It should be noted that the air injection section 122, the air expansion section 123, and the air mixing section 121 can be connected in a combined manner; they can also be designed as an integrated structure, which can further simplify the number of parts of the air duct structure 100 and is easy to assemble.

[0056] In addition, for the convenience of understanding the cross-sectional area of the air expansion section 123, Figure 2 an example is given for illustration. The cross-section of the air expansion section 123 is Figure 2 the area indicated by S in

[0057] In some embodiments, referring to Figure 2 , the air injection section 122 includes a first part 12a and a second part 12b that are sequentially connected. The second part 12b is connected to the air mixing section 121 through the first part 12a. The second part 12b is used to input fuel gas, and one end of the second part 12b away from the first part 12a is used to introduce combustion-supporting gas. Among them, the first part 12a is bent relative to the second part 12b. It can be seen from this that the first part 12a has a curved structure. In this way, the air injection section 122 is designed as a structure with mutual bending, so that when the combustion-supporting gas or the mixed gas (i.e., the mixture of the combustion-supporting gas and the fuel gas) flows from the second part 12b into the first part 12a, its flow direction changes, causing the combustion-supporting gas to generate air flow disturbance in advance, which is beneficial to strengthening the mixing of the fuel gas and the combustion-supporting gas.

[0058] It should be noted that the bending angle between the first part 12a and the second part 12b can be selected between 0° (excluding the endpoints) and 180° (excluding the endpoints). At the same time, for the convenience of the smooth flow of the combustion-supporting gas between the first part 12a and the second part 12b, the first part 12a and the second part 12b should be smoothly connected.

[0059] It should also be noted that when the intake member 12 further includes the air expansion section 123, one end of the first part 12a away from the second part 12b is connected to the air expansion section 123, and one end of the air expansion section 123 away from the second part 12b is connected to the air mixing section 121. In this way, the combustion-supporting gas or the mixed gas can flow through the second part 12b, the first part 12a, the air expansion section 123, the air mixing section 121, and the mixing chamber 11 in sequence.

[0060] In addition, in addition to introducing the combustion-supporting gas at one end of the second part 12b itself, fuel gas is also introduced into its interior. There can be various designs for the introduction position of the fuel gas on the second part 12b. For example: it can also be introduced from one end of the second part 12b and enter the second part 12b together with the combustion-supporting gas; it can also be introduced from the side of the second part 12b, etc.

[0061] In some embodiments, referring to Figure 2, the air inflation section 122 includes a first part 12a and a second part 12b that are connected in sequence. The second part 12b is connected to the air expansion section 123 through the first part 12a. The second part 12b is used to input fuel gas, and one end of the second part 12b away from the first part 12a is used to introduce combustion-supporting gas. Among them, the first part (12a) is bent relative to the second part (12b). It can be seen from this that after the combustion-supporting gas and the fuel gas flow through the first part 12a, they enter the air expansion section 123 to expand the distribution range of the mixed gas and make the mixed gas evenly distributed.

[0062] In some embodiments, please refer to Figure 2 , the part where the first part 12a is connected to the second part 12b is an arc-shaped bending structure. The bending angle between the first part 12a and the second part 12b is denoted as θ, where 80° ≤ θ ≤ 100°. It can be seen from this that the bending angle θ can be, but is not limited to, 80°, 85°, 90°, 95°, 100°, etc. In this way, by controlling the bending angle θ between 80° and 100°, the combustion-supporting gas or the mixed gas in the second part 12b is significantly blocked before flowing into the first part 12a, so that the combustion-supporting gas or the mixed gas generates significant airflow disturbance in advance, which is convenient for full mixing with the fuel gas.

[0063] Specifically, the bending angle θ can be 90°.

[0064] It should be noted that the bending angle between the first part 12a and the second part 12b can be understood as: the bending angle of the first part 12a relative to the second part 12b, that is, the angle θ by which the axis of the outlet end of the first part 12a rotates counterclockwise relative to the axis of the outlet end of the second part 12b. For specific reference, please refer to Figure 2 .

[0065] In some embodiments, please refer to Figure 2 , the air duct structure 100 further includes a spoiler 40. The spoiler 40 is arranged in the gas mixing section 121 and is used to mix the fuel gas and the combustion-supporting gas in the gas mixing section 121. It can be seen from this that by arranging the spoiler 40 in the gas mixing section 121, the spoiler 40 is used to remix the combustion-supporting gas and the fuel gas, further strengthening the mixing of the fuel gas and the combustion-supporting gas and ensuring uniform and full mixing of the two.

[0066] It should be noted that the spoiler 40 refers to a device that can stir the combustion-supporting gas and the fuel gas in the gas mixing section 121 to make the two fully mixed. The installation method of the spoiler 40 in the gas mixing section 121 can be, but is not limited to, bolt connection, clamping, riveting, welding, bonding, etc.

[0067] Furthermore, please refer to Figure 2, the spoiler 40 includes vanes, and a groove 124 is provided on the inner wall of the gas mixing section 121. At least part of the vanes are snapped into the groove 124. In this way, by installing the vanes through the groove 124, not only is the installation convenient, but also it is convenient for the vanes to swirl the air flow in the air intake member 12 and strengthen the mixing.

[0068] It should be noted that the vanes can be fixed in the groove 124 or can rotate around their own axes to further stir the mixing of the air flow.

[0069] The arrangement of the spoiler 40 in the gas mixing section 121 can keep the axis of the vanes in line with the axis of the gas mixing section 121, so that the air and the fuel gas are more likely to impact on the vanes to form a swirling effect. At the same time, the vanes can be designed at a certain inclination angle to increase the force-bearing area of the vanes.

[0070] In some embodiments, please refer to Figure 2 , the gas mixing section 121 is configured as a straight section structure. The length of the gas mixing section 121 is denoted as L, and the distance between the end of the spoiler 40 close to the mixing chamber 11 and the end of the gas mixing section 121 close to the mixing chamber 11 is denoted as D. Among them, D / L ≤ 1 / 3. It can be seen from this that the spoiler 40 is arranged at or below the position close to the last 1 / 3, so that full mixing is achieved before entering the mixing chamber 11, and the mixing uniformity between the fuel gas and the combustion-supporting gas is improved.

[0071] In some embodiments, please refer to Figure 2 , the mixing chamber 11 extends along a preset direction X, and the outlet end of the air intake member 12 communicated with the mixing chamber 11 is arranged at one end of the mixing chamber 11 along the preset direction X. In this way, by arranging the outlet end of the air intake member 12 at one end of the mixing chamber 11 along the preset direction X, the mixed gas can start to flow from one end along the preset direction X when entering the mixing chamber 11, which can not only make the mixed gas fill or approximately fill the mixing chamber 11; but also extend the mixing path and improve the mixing uniformity.

[0072] Among them, the preset direction X can be the length direction of the mixing chamber 11 or the width direction.

[0073] In some embodiments, please refer to Figure 3 , the present application provides a combustion device, which includes: a burner 200 and an air duct structure 100 as described in any one of the above. The burner 200 is arranged on the side of the mixing chamber 11 away from the air intake member 12 and is communicated with the mixing chamber 11.

[0074] The above combustion device adopts the above air duct structure 100. During the combustion process, combustion-supporting gas can be introduced into the air inlet part 12; at the same time, fuel gas is introduced into the air inlet part 12 and / or the mixing chamber 11, so that the combustion-supporting gas and the fuel gas can be mixed at least in the mixing chamber 11. The gas after mixing can flow from the mixing chamber 11 into the burner 200 for combustion, thus achieving stable combustion. Since the air inlet part 12 and the mixing chamber 11 are of an integrated structure, on the premise of achieving stable combustion, the number of parts of the air duct structure 100 is reduced, the structure is simplified, and assembly is facilitated.

[0075] Furthermore, please refer to Figure 1 , the combustion device further includes a first gas delivery part 13 and a second gas delivery part 14. The first gas delivery part 13 is communicated with the air inlet part 12, and the second gas delivery part 14 is communicated with the burner 200. Among them, at least one of the first gas delivery part 13 and the second gas delivery part 14 is used for introducing fuel gas. When premixed combustion is carried out, the fuel gas is controlled to be introduced into the first gas delivery part 13 and flow into the air inlet part 12. At the same time, combustion-supporting gas is blown into the air inlet part 12, and the combustion-supporting gas and the fuel gas are mixed in the air inlet part 12 and the mixing chamber 11 respectively. The mixed gas enters the burner 200 for ignition and combustion to achieve high-efficiency and low-emission premixed combustion. When diffusion combustion is carried out, the fuel gas is controlled to be introduced into the second gas delivery part 14, so that the fuel gas is directly introduced into the burner 200 for ignition and combustion to achieve short flame and stable combustion of diffusion combustion under small load conditions. In this way, on the premise of realizing the uniform mixing and distribution of the fuel gas and the combustion-supporting gas, and at the same time realizing short flame, stable and efficient combustion and reducing pollutant emissions within the full load adjustment range, the number of parts of the air duct structure 100 is reduced, and the structure is simple and easy to assemble.

[0076] Optionally, there are various installation methods for the first gas delivery part 13 and the second gas delivery part 14. For example: the first gas delivery part 13 and the second gas delivery part 14 can be fixed by bolt connection, clamping, welding and other methods respectively.

[0077] Furthermore, please refer to Figure 2 , a step part 112 is provided on the side of the mixing chamber 11 away from the burner 200, and an opening groove 111 is provided on the step part 112. At least part of the second gas delivery part 14 is disposed through the opening groove 111. In this way, by providing the step part 112 on the side of the mixing chamber 11 facing away from the burner 200, the installation of the second gas delivery part 14 is facilitated, and the assembly efficiency is improved.

[0078] In addition, to make the structure of the second gas delivery part 14 more stable, please refer to Figure 2 , a limiting part 141 is provided on the second gas delivery part 14, and the limiting part 141 abuts against the inner wall of the opening groove 111.

[0079] Even further, please refer to Figure 2, the mixing chamber 11 extends along a preset direction X, and the outlet end of the air inlet member 12 communicating with the mixing chamber 11 and the step portion 112 are arranged at intervals along the preset direction X of the mixing chamber 11. In this way, the positions of the air inlet member 12 and the step portion 112 are reasonably arranged to enable stable premixed combustion and diffusion combustion. Specifically, in some embodiments, the outlet end of the air inlet member 12 and the step portion 112 are respectively arranged at opposite ends of the mixing chamber 11 along the preset direction X.

[0080] In some embodiments, please refer to Figure 2 , the burner 200 includes a first combustion module 220 and a second combustion module 224 nested with each other. The first combustion module 220 is provided with at least one first combustion hole 221, and the second combustion module 224 is provided with at least one second combustion hole 222. One of the first combustion hole 221 and the second combustion hole 222 communicates with the mixing chamber 11, and the other of the first combustion hole 221 and the second combustion hole 222 communicates with the second gas delivery member 14.

[0081] In this way, the nested first combustion module 220 and second combustion module 224 can respectively introduce the fuel gas and the combustion-supporting gas into the first combustion hole 221 or the first combustion hole 221, so as to realize the switching between premixed combustion and diffusion combustion or enable premixed combustion and diffusion combustion to occur simultaneously.

[0082] It should be noted that the number of the first combustion holes 221 and the second combustion holes 222 can be designed to be multiple, and the first combustion holes 221 and the second combustion holes 222 can be arranged at intervals to ensure uniform flame emission. At the same time, the burner 200 further includes a housing 210, the housing 210 is connected to the mixing chamber 11, and at least a part of the first combustion module 220 and the second combustion module 224 are arranged inside the housing 210. In addition, the burner 200 may further include a water-cooling pipe, and the water-cooling pipe is arranged on the first combustion module 220 and / or the second combustion module 224 for cooling the part of the first combustion module 220 and / or the second combustion module 224 located outside the housing 210.

[0083] In some embodiments, please refer to Figure 6 , the combustion device further includes a control valve 20, and the control valve 20 is respectively connected to the first gas delivery member 13 and the second gas delivery member 14 for selectively introducing the fuel gas into the first gas delivery member 13 and the second gas delivery member 14. It can be seen from this that when premixed combustion occurs, the control valve 20 controls the fuel gas to be introduced into the first gas delivery member 13 and then into the air inlet member 12. When diffusion combustion occurs, the control valve 20 controls the fuel gas to be introduced into the second gas delivery member 14, so that the fuel gas is directly introduced into the burner 200 for ignition combustion to achieve short flame and stable combustion of diffusion combustion under low-load conditions.

[0084] In some embodiments, please refer to Figure 6, the combustion device further includes a blower 30, and the blower 30 is communicated with one end of the air inlet member 12 away from the mixing chamber 11. In this way, the combustion-supporting gas is stably transported into the air inlet member 12 through the blower 30 to achieve stable combustion. At the same time, the blower 30 is communicated with one end of the air inlet member 12, making the spatial layout of the components in the combustion device more reasonable and saving space.

[0085] In some embodiments, please refer to Figure 6 , the combustion device further includes a control valve 20 and a blower 30. The mixing chamber 11 extends along a preset direction X. Along the preset direction X, the air inlet member 12, the blower 30, and the control valve 20 are sequentially distributed. In this way, the spatial layout of the components in the combustion device is more reasonable, further saving space.

[0086] In some embodiments, the present application provides a combustion system, and the combustion system includes the combustion device of any one of the above.

[0087] In some embodiments, please refer to Figure 6 , the present application provides a combustion device, and the combustion device includes the combustion device of any one of the above. Among them, the combustion device can be, but is not limited to, a gas water heater, a wall-mounted boiler, etc.

[0088] Furthermore, please refer to Figure 6 , the combustion device further includes a water cooling jacket 300, an electrical box module 400, a cold water pipe, a hot water pipe, and a casing 700. The water cooling jacket 300 is arranged above the burner 200 and is used to absorb the waste heat of the flue gas and maintain the low temperature of the body surface at the same time. The electrical box module 400 is arranged in the casing 700, and the cold water pipe and the hot water pipe are respectively arranged outside the casing 700.

[0089] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0090] The above embodiments only express several implementation manners of the present application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An air duct structure, characterized in that, The air duct structure includes: A mixing chamber (11) for communicating with a burner (200); An air inlet member (12) communicating with the mixing chamber (11), and one end of the air inlet member (12) away from the mixing chamber (11) is used for introducing combustion-supporting gas, and at least one of the mixing chamber (11) and the air inlet member (12) is used for introducing fuel gas; Wherein, the mixing chamber (11) and the air inlet member (12) are of an integral structure.

2. The air duct structure according to claim 1, characterized in that, The air duct structure includes a first housing (15) and a second housing (16), the first housing (15) includes a first mixing part (151) and a first air inlet part (152), and the second housing (16) includes a second mixing part (161) and a second air inlet part (162); The first housing (15) and the second housing (16) are hermetically connected so that the first mixing part (151) and the second mixing part (161) form the mixing chamber (11), and the first air inlet part (152) and the second air inlet part (162) form the air inlet member (12); Wherein, the first mixing part (151) and the first air inlet part (152) are of an integral structure; and / or, the second mixing part (161) and the second air inlet part (162) are of an integral structure.

3. The air duct structure according to claim 2, characterized in that, Among the two mating surfaces of the first housing (15) and the second housing (16) facing each other, a positioning protrusion (164) is provided on one of them, and a positioning groove (163) for inserting the positioning protrusion (164) is provided on the other.

4. The air duct structure according to claim 1, wherein The air inlet member (12) includes a gas mixing section (121) and a gas blowing section (122) communicating with the gas mixing section (121). One end of the gas mixing section (121) away from the gas blowing section (122) communicates with the mixing chamber (11), the gas blowing section (122) is used for introducing the combustion-supporting gas, and at least one of the gas mixing section (121) and the gas blowing section (122) is used for introducing the fuel gas.

5. The air duct structure according to claim 4, characterized in that, The air inlet member (12) further includes a diffuser section (123), the diffuser section (123) is connected between the gas mixing section (121) and the gas blowing section (122), and the cross-sectional area of the diffuser section (123) gradually increases from the end connected to the gas blowing section (122) to the end connected to the gas mixing section (121).

6. The air duct structure according to claim 4, characterized in that, The gas blowing section (122) includes a first part (12a) and a second part (12b) connected in sequence. The second part (12b) communicates with the gas mixing section (121) through the first part (12a). The second part (12b) is used for inputting fuel gas, and one end of the second part (12b) away from the first part (12a) is used for introducing the combustion-supporting gas; Wherein, the first part (12a) is bent relative to the second part (12b).

7. The air duct structure according to claim 5, characterized in that, The air-blowing section (122) includes a first part (12a) and a second part (12b) that are connected in sequence. The second part (12b) is connected to the air-expanding section (123) through the first part (12a). The second part (12b) is used to input fuel gas, and one end of the second part (12b) away from the first part (12a) is used to introduce the combustion-supporting gas. Wherein, the first part (12a) is bent relative to the second part (12b).

8. The air duct structure according to claim 6 or 7, characterized in that The part where the first part (12a) is connected to the second part (12b) is an arc-shaped bending structure. The bending angle between the first part (12a) and the second part (12b) is denoted as θ, where 80° ≤ θ ≤ 100°.

9. The air duct structure according to any one of claims 4-7, characterized in that, The air duct structure further includes a turbulator (40). The turbulator (40) is arranged in the gas mixing section (121) and is used to mix the fuel gas and the combustion-supporting gas in the gas mixing section (121).

10. The air duct structure according to claim 9, characterized in that, The turbulator (40) includes blades. Grooves (124) are provided on the inner wall of the gas mixing section (121), and at least part of the blades are clamped into the grooves (124).

11. The air duct structure according to claim 9, wherein, The gas mixing section (121) is configured as a straight section structure. The length of the gas mixing section (121) is denoted as L, and the distance between one end of the turbulator (40) close to the mixing chamber (11) and one end of the gas mixing section (121) close to the mixing chamber (11) is denoted as D, where D / L ≤ 1 / 3.

12. The air duct structure according to any one of claims 4-7, characterized in that, The mixing chamber (11) extends along a preset direction (X). The outlet end of the air inlet member (12) communicated with the mixing chamber (11) is arranged at one end of the mixing chamber (11) along the preset direction (X).

13. A combustion device, characterized in that, The combustion device includes: A burner (200); The air duct structure according to any one of claims 1-12, wherein the burner (200) is arranged on a side of the mixing chamber (11) away from the air inlet member (12) and is communicated with the mixing chamber (11).

14. The combustion device according to claim 13, characterized in that, The combustion device further includes a first gas delivery member (13) and a second gas delivery member (14). The first gas delivery member (13) is communicated with the air inlet member (12), and the second gas delivery member (14) is communicated with the burner (200); Wherein, at least one of the first gas delivery member (13) and the second gas delivery member (14) is used to introduce the fuel gas.

15. The combustion device according to claim 14, characterized in that, One side of the mixing chamber (11) away from the burner (200) has a stepped portion (112). An opening groove (111) is provided on the stepped portion (112), and at least part of the second gas delivery member (14) passes through the opening groove (111).

16. The combustion device according to claim 15, characterized in that, The mixing chamber (11) extends along the preset direction (X). The outlet end of the air inlet member (12) communicated with the mixing chamber (11) and the stepped portion (112) are arranged at intervals along the preset direction (X) of the mixing chamber (11).

17. The combustion device according to claim 14, characterized in that, The burner (200) includes a first combustion module (220) and a second combustion module (224) nested with each other. The first combustion module (220) is provided with at least one first combustion hole (221), and the second combustion module (224) is provided with at least one second combustion hole (222). One of the first combustion hole (221) and the second combustion hole (222) is in communication with the mixing chamber (11), and the other of the first combustion hole (221) and the second combustion hole (222) is in communication with the second gas delivery member (14).

18. The combustion device according to claim 14, characterized in that, The combustion device further includes a control valve (20). The control valve (20) is respectively connected to the first gas delivery member (13) and the second gas delivery member (14) and is configured to selectively introduce fuel gas into the first gas delivery member (13) and the second gas delivery member (14); and / or, The combustion device further includes a blower (30). The blower (30) is in communication with one end of the air intake member (12) away from the mixing chamber (11).

19. The combustion device according to claim 13, characterized in that, The combustion device further includes a control valve (20) and a blower (30). The mixing chamber (11) extends along a preset direction (X). Along the preset direction (X), the air intake member (12), the blower (30), and the control valve (20) are sequentially arranged.

20. A combustion system, characterized in that, The combustion system includes the combustion device according to any one of claims 13-19.

21. A combustion device, characterized in that, The combustion equipment includes the combustion device according to any one of claims 13-19.

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