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

Abstract

The invention relates to an air duct structure, a combustion device, a combustion system and combustion equipment. The air duct structure comprises a mixing chamber and an air inlet piece. The mixing chamber is used for communicating with a combustor; the gas inlet piece is communicated with the mixing chamber, the end, away from the mixing chamber, of the gas inlet piece is used for introducing combustion-supporting gas, and at least one of the mixing chamber and the gas inlet piece is used for introducing fuel gas; wherein the gas inlet piece comprises a mixing section, the mixing section is used for allowing the combustion-supporting gas and / or the fuel gas to flow through and enter the mixing chamber, and the circulation path of the combustion-supporting gas and / or the fuel gas in the mixing section is in an S shape. According to the air duct structure provided by the embodiment of the invention, the path for circulation of the fuel gas and the combustion-supporting gas in the mixing section is set to be S-shaped, so that the mixing path of the fuel gas and the combustion-supporting gas can be prolonged, airflow is prevented from directly entering the mixing chamber, sufficient mixing time of the fuel gas and the combustion-supporting gas is ensured, and the fuel gas and the combustion-supporting gas are mixed more uniformly.

Description

Technical Field

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

[0002] A burner is a general term for a device that sprays and mixes fuel and air for combustion. Burners can be classified into types such as premixed combustion, diffusion combustion, and flameless combustion according to the combustion method. In order to expand the application range of burners, some burners combine premixed combustion and diffusion combustion in the same burner so that the burner can work in different ways according to the situation.

[0003] Because the air duct structures adopted for different combustion methods are different, in order for a burner to achieve premixed combustion and diffusion combustion, its air duct structure needs to be equipped with a variety of components, resulting in a complex structure of the air duct structure and a large assembly difficulty. Summary of the Invention

[0004] In view of the problem of the complex structure of the air duct structure of the existing burner, the present application provides an air duct structure, a combustion device, a combustion system, and a combustion equipment, which have the technical effects of simple structure and easy assembly.

[0005] An air duct structure includes:

[0006] A mixing chamber for communicating with a burner;

[0007] An air inlet member communicating with the mixing chamber, 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 fuel gas;

[0008] Wherein, the air inlet member includes a mixing section through which the combustion-supporting gas and / or the fuel gas flows and enters the mixing chamber, and the flow path of the combustion-supporting gas and / or the fuel gas in the mixing section is in an S shape.

[0009] In one embodiment, at least two blocking blocks are provided on the inner wall of the mixing section, and along the extending direction of the mixing section, the at least two blocking blocks are staggered, and the longitudinal section of the cavity formed by the blocking blocks and the inner wall of the mixing section is in an S shape.

[0010] In one embodiment, the air inlet member further includes a blowing section communicating with the mixing section, the blowing section is used for introducing the combustion-supporting gas and the fuel gas, and one end of the mixing section away from the blowing section communicates with the mixing chamber.

[0011] In one embodiment, the air inlet member further includes a diffuser section, which is connected between the air blowing section and the mixing section, and the cross-sectional area of the diffuser section gradually increases from one end connected to the air blowing section to the other end connected to the mixing section.

[0012] In one embodiment, the air duct structure further includes a flow disturbing member, which is disposed in the diffuser section and / or the air blowing section and is used to mix the fuel gas and the combustion-supporting gas in the diffuser section.

[0013] In one embodiment, the structure of the flow disturbing member is configured in a shape of a fan blade.

[0014] In one embodiment, the paths for the combustion-supporting gas and the fuel gas to flow in the air blowing section are in an arc shape.

[0015] In one embodiment, the air blowing section includes a first part and a second part that are connected in sequence. The second part is connected to the mixing section through the first part. The second part is used to introduce the fuel gas, and one end of the second part away from the first part is used to introduce the combustion-supporting gas;

[0016] Wherein, the first part is bent relative to the first part.

[0017] In one embodiment, the mixing chamber and the air inlet member are integrally formed.

[0018] In one embodiment, 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;

[0019] 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;

[0020] 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.

[0021] In one embodiment, 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.

[0022] In one embodiment, the first air inlet portion includes a first mixing section, the first mixing section includes at least two first blocking blocks, the second air inlet portion includes a second mixing section, the second mixing section includes at least two second blocking blocks, and the number and positions of the first blocking blocks and the second blocking blocks correspond one by one, such that after the first housing and the second housing are hermetically connected, any one of the blocking blocks is formed by hermetically connecting one of the first blocking blocks and a corresponding one of the second blocking blocks.

[0023] In one embodiment, the mixing chamber extends along a preset direction, and the 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.

[0024] In one embodiment, the longitudinal section of the mixing chamber is S-shaped.

[0025] A combustion device includes:

[0026] A burner;

[0027] The air duct structure in any of the above embodiments, the burner is disposed on a side of the mixing chamber away from the air inlet member and communicates with the mixing chamber.

[0028] In one embodiment, 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;

[0029] Wherein, among the first gas delivery member and the second gas delivery member, at least one is used to introduce the fuel gas.

[0030] In one embodiment, 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.

[0031] In one embodiment, 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; and / or,

[0032] The combustion device further includes a blower, and the blower communicates with one end of the air inlet member away from the mixing chamber.

[0033] A combustion system, the combustion system includes the combustion device in any of the above embodiments.

[0034] A combustion device, which includes the combustion device in any of the above embodiments.

[0035] For the above air duct structure, combustion device, combustion system and combustion equipment, by setting the path for the flow of fuel gas and combustion-supporting gas in the mixing section of the air duct structure as an S shape, the mixing path of the fuel gas and the combustion-supporting gas can be extended, preventing the air flow from directly entering the mixing chamber, ensuring sufficient mixing time for the fuel gas and the combustion-supporting gas, and making the mixing between the fuel gas and the combustion-supporting gas more uniform. Description of the Drawings

[0036] Figure 1 It is a front view of the air duct structure provided by some embodiments of the present application.

[0037] Figure 2 It is a cross-sectional view of the air duct structure provided by some embodiments of the present application.

[0038] Figure 3 It is a three-dimensional view of the air duct structure provided by some embodiments of the present application.

[0039] Figure 4 It is a three-dimensional view of the air duct structure provided by some embodiments of the present application from another perspective.

[0040] Figure 5 It is Figure 4 an enlarged view of part B in

[0041] Figure 6 It is a schematic structural view of the air duct structure provided by some embodiments of the present application with some structures hidden.

[0042] Figure 7 It is Figure 6 an enlarged view of part A in

[0043] Figure 8 It is a schematic structural view of the combustion device provided by some embodiments of the present application.

[0044] Description of the Reference Numerals:

[0045] 10. Mixing chamber; 20. Intake component; 21. Mixing section; 21a. Blocking block; 22. Air-blowing section; 22a. First part; 22b. Second part; 23. Diffusion section; 30. Turbulence component; 40. First housing; 41. First mixing part; 42. First intake part; 421. First mixing section; 4211. First blocking block; 50. Second housing; 51. Second mixing part; 52. Second intake part; 53. Positioning projection; 54. Positioning groove; 100. Air duct structure; 200. Burner; 210. First combustion module; 211. First combustion hole; 220. Second combustion module; 221. Second combustion hole; 230. First outer shell; 300. First gas transmission component; 400. Second gas transmission component; 500. Control valve; 600. Fan; 700. Second outer shell; 800. Electrical box; 1000. Combustion device; X. Preset direction; Y. First direction. Detailed implementation manners

[0046] 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 in conjunction with 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.

[0047] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are 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 therefore should not be construed as a limitation of the present application.

[0048] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0049] In this application, unless otherwise clearly specified or limited, terms such as "installed", "connected", "linked", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0050] In this application, unless otherwise clearly specified or 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 first feature is at a higher horizontal level than 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 first feature is at a lower horizontal level than the second feature.

[0051] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When 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. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation.

[0052] Please refer to Figure 1 , some embodiments of this application provide an air duct structure 100. The air duct structure 100 includes a mixing chamber 10 and an air inlet member 20. The mixing chamber 10 is used to communicate with a burner 200; the air inlet member 20 is in communication with the mixing chamber 10, and one end of the air inlet member 20 away from the mixing chamber 10 is used to introduce combustion-supporting gas, and at least one of the mixing chamber 10 and the air inlet member 20 is used to introduce fuel gas; wherein, the air inlet member 20 includes a mixing section 21, and the mixing section 21 allows the combustion-supporting gas and / or the fuel gas to flow through and enter the mixing chamber 10, and the flow path of the combustion-supporting gas and / or the fuel gas in the mixing section 21 is in an S shape.

[0053] In the above air duct structure 100, during the combustion process, combustion-supporting gas can be introduced into the air inlet member 20; at the same time, fuel gas is introduced into the air inlet member 20 and / or the mixing chamber 10, so that the combustion-supporting gas and the fuel gas can be mixed at least in the mixing chamber 10. The mixed gas can flow from the mixing chamber 10 into the burner 200 for combustion. When the combustion-supporting gas and / or the fuel gas flow through the mixing section 21, since the flow path of these gases in the mixing section 21 is S-shaped, the mixing path of the fuel gas and the combustion-supporting gas can be extended, preventing the air flow from directly entering the mixing chamber 10, ensuring sufficient mixing time for the fuel gas and the combustion-supporting gas, and making the mixing between the fuel gas and the combustion-supporting gas more uniform.

[0054] Among them, the combustion-supporting gas can be, but is not limited to, air.

[0055] Please refer to Figure 2 , in some embodiments, at least two blocking blocks 21a are provided on the inner wall of the mixing section 21. Along the extending direction of the mixing section 21, the at least two blocking blocks 21a are staggered, and the longitudinal section of the cavity formed by the blocking blocks 21a and the inner wall of the mixing section 21 is S-shaped.

[0056] Exemplarily, as Figure 2 shown, the mixing section 21 extends along the first direction Y. In the first direction Y, a plurality of blocking blocks 21a are provided on the inner wall of the mixing section 21. In other words, all the blocking blocks 21a are spaced along the first direction Y. In this way, in the first direction Y, the blocking blocks 21a and the inner wall of the mixing section 21 jointly form a chamber for the combustion-supporting gas and / or the fuel gas to flow through. The longitudinal section of this chamber, that is, the cross-section in the first direction Y, is S-shaped.

[0057] With such a setting, the internal structure of the mixing section 21 is simplified, and it is easy to manufacture the mixing section 21.

[0058] In some embodiments, please refer to Figure 2 , the air inlet member 20 further includes a blowing section 22. The blowing section 22 is communicated with the mixing section 21. The blowing section 22 is used to introduce the combustion-supporting gas and the fuel gas, and one end of the mixing section 21 far from the blowing section 22 is communicated with the mixing chamber 10.

[0059] It can be seen from this that during premixed combustion, the fuel gas and the combustion-supporting gas are introduced into the blowing section 22, so that the fuel gas and the combustion-supporting gas are mixed once in the gas mixing section; after mixing, they uniformly flow into the mixing chamber 10 and are mixed again. With such a design, the mixing path of the fuel gas and the combustion-supporting gas can be extended, preventing the air flow from directly entering the mixing chamber 10, ensuring sufficient mixing time for the fuel gas and the combustion-supporting gas, making the mixing between the fuel gas and the combustion-supporting gas more uniform, and further realizing efficient and low-emission premixed combustion.

[0060] It should be noted that the air injection section 22 is connected to the air mixing section, which can be directly connected. For example, one end of the air injection section 22 is directly connected to and communicates with one end of the air mixing section; it can also be indirectly connected. For example, one end of the air injection section 22 is connected to one end of the air mixing section through an intermediate structure and communicates with the air injection section 22 through the intermediate structure.

[0061] Furthermore, the air inlet member 20 further includes a diffuser section 23, and the diffuser section 23 is connected between the air injection section 22 and the mixing section 21. It can be seen from this that the air mixing section and the air injection section 22 are indirectly connected, and the combustion-supporting gas in the air injection section 22 enters the air mixing section through the diffuser section 23. The cross-sectional area of the diffuser section 23 gradually increases from the end where the diffuser section 23 is connected to the air injection section 22 to the other end where the diffuser section 23 is connected to the mixing section 21. Therefore, the diffuser section 23 is in an expanded state, slowing down the flow rate of the combustion-supporting gas, expanding the range where the combustion-supporting gas enters the air mixing section, making the combustion-supporting gas evenly dispersed in the air mixing section, improving the mixing uniformity with the fuel gas, and enhancing the stability of combustion.

[0062] It should be noted that the air injection section 22, the diffuser section 23 and the air mixing section 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.

[0063] In some embodiments, please refer to Figure 2 , the air duct structure 100 further includes a flow disturbing member 30, and the flow disturbing member 30 is arranged in the diffuser section 23 and / or the air injection section 22 and is used to mix the fuel gas and the combustion-supporting gas in the diffuser section 23. It can be understood that the flow disturbing member 30 is arranged at a certain position between the diffuser section 23 and the air injection section 22. It can be seen from this that the flow disturbing member 30 is arranged in the air mixing section, and the flow disturbing member 30 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 the uniform and sufficient mixing of the two.

[0064] It should be noted that the flow disturbing member 30 refers to a device that can stir the combustion-supporting gas and the fuel gas in the air mixing section to make the two fully mixed. The installation method of the flow disturbing member 30 in the air mixing section can be, but is not limited to, bolt connection, clamping, riveting, welding, bonding, etc.

[0065] Specifically, the structure of the flow disturbing member 30 is configured as a fan blade shape. In this way, the structure of the flow disturbing member 30 is reduced, and it is easy to prepare the flow disturbing member 30. Among them, the fan blade can be fixed relative to the diffuser section 23 or can rotate around its own axis to further stir the mixing of the air flow.

[0066] Such as Figure 2As shown, in some embodiments, the path for the flow of combustion-supporting gas and fuel gas in the air-blowing section 22 is arc-shaped. When the combustion-supporting gas and fuel gas are introduced into the air-blowing section 22, appropriately extending the path for the flow of combustion-supporting gas and fuel gas in the air-blowing section 22 can extend the mixing path of the combustion-supporting gas and fuel gas during initial mixing, so as to extend the mixing time of the combustion-supporting gas and fuel gas, thereby improving the mixing uniformity of the combustion-supporting gas and fuel gas.

[0067] In some embodiments, please refer to Figure 2 , the air-blowing section 22 includes a first part 22a and a second part 22b that are sequentially connected. The second part 22b is connected to the gas mixing section through the first part 22a. The second part 22b is used to input fuel gas, and one end of the second part 22b away from the first part 22a is used to introduce combustion-supporting gas. Among them, the first part 22a is bent relative to the second part 22b. It can be seen from this that the first part 22a has a curved structure. In this way, the air-blowing section 22 is designed into a structure with mutual bending, so that when the combustion-supporting gas or mixed gas (that is, the mixture of combustion-supporting gas and fuel gas) flows from the second part 22b into the first part 22a, its flow direction changes, causing the combustion-supporting gas to generate airflow disturbance in advance, which is beneficial to strengthening the mixing of fuel gas and combustion-supporting gas.

[0068] It should be noted that the bending angle between the first part 22a and the second part 22b can be selected between 0° (excluding the endpoints) and 180° (excluding the endpoints). At the same time, for the combustion-supporting gas to flow smoothly between the first part 22a and the second part 22b, the first part 22a and the second part 22b should be smoothly connected.

[0069] It should also be noted that when the air intake member 20 further includes a diffusing section 23, one end of the first part 22a away from the second part 22b is connected to the diffusing section 23, and one end of the diffusing section 23 away from the second part 22b is connected to the gas mixing section. In this way, the combustion-supporting gas or mixed gas can flow through the second part 22b, the first part 22a, the diffusing section 23, the gas mixing section, and the mixing chamber 10 in sequence.

[0070] In addition, in addition to introducing combustion-supporting gas at one end of the second part 22b itself, fuel gas is also introduced into its interior. There are various designs for the introduction position of the fuel gas on the second part 22b. For example: it can also be introduced from one end of the second part 22b and enter the second part 22b together with the combustion-supporting gas; it can also be introduced from the side of the second part 22b, etc.

[0071] In some embodiments, the mixing chamber 10 and the air inlet member 20 are integrally formed. The integral formation here means that the connection between the mixing chamber 10 and the air inlet member 20 is in an integral formation manner, such as, but not limited to, extrusion, injection molding, die casting, 3D printing, etc. However, the structures of the mixing chamber 10 and the air inlet member 20 themselves can be designed as an integral structure or a combined structure, such as: connected by bolts, snap connection, pin connection, welding, riveting, etc.

[0072] With such a setting, not only can the connection strength between the mixing chamber 10 and the air inlet member 20 be improved, but also the manufacturing processes of the two are simplified.

[0073] Furthermore, please refer to Figure 3 and Figure 4 , the air duct structure 100 includes a first housing 40 and a second housing 50. The first housing 40 includes a first mixing portion 41 and a first air inlet portion 42. The second housing 50 includes a second mixing portion 51 and a second air inlet portion 52. The first housing 40 and the second housing 50 are sealingly connected so that the first mixing portion 41 and the second mixing portion 51 form the mixing chamber 10, and the first air inlet portion 42 and the second air inlet portion 52 form the air inlet member 20. Among them, the first mixing portion 41 and the first air inlet portion 42 are of an integral structure; and / or, the second mixing portion 51 and the second air inlet portion 52 are of an integral structure.

[0074] It can be seen from this that the integral structure between the mixing chamber 10 and the air inlet member 20 means that the connection manner between the mixing chamber 10 and the air inlet member 20 is an integral formation manner, and the structures of the mixing chamber 10 and the air inlet member 20 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 40 and the second housing 50 are combined, which is convenient for processing or assembling components inside the air duct structure 100.

[0075] It should be noted that the sealing connection between the first housing 40 and the second housing 50 means that after the first housing 40 and the second housing 50 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 40 and the second housing 50 can be, but not limited to, bolt connection, snap connection, riveting, welding, etc. Of course, to further improve the sealing effect between the first housing 40 and the second housing 50, a sealing rubber can be provided between the first housing 40 and the second housing 50.

[0076] Even further, please refer to Figure 5 , among the two mating surfaces of the first housing 40 and the second housing 50 facing each other, a positioning protrusion 53 is provided on one of them, and a positioning groove 54 for inserting the positioning protrusion 53 is provided on the other. In this way, through the cooperation of the positioning protrusion 53 and the positioning groove 54, the first housing 40 and the second housing 50 are tightly connected, which is beneficial to improving the sealing performance and stability of the air duct structure 100.

[0077] It should be noted that the structures of the positioning groove 54 and the positioning protrusion 53 can have various designs. For example: the positioning groove 54 and the positioning protrusion 53 can be designed as an integral structure. For example: the positioning groove 54 and the positioning protrusion 53 can extend along the circumferential direction of the first housing 40 or the second housing 50; alternatively, the positioning groove 54 and the positioning protrusion 53 can be designed as a multi-segmented and spaced structure along the circumferential direction of the first housing 40 or the second housing 50.

[0078] Please refer to Figure 3 , in some embodiments, the first air inlet portion 42 includes a first mixing section 421. The first mixing section 421 includes at least two first blocking blocks 4211. The second air inlet portion 52 includes a second mixing section (not shown in the figure). The second mixing section includes at least two second blocking blocks. The number and positions of the first blocking blocks 4211 and the second blocking blocks correspond one by one. After the first housing 40 and the second housing 50 are hermetically connected, any one of the blocking blocks 21a is formed by hermetically connecting one of the first blocking blocks 4211 and the corresponding second blocking block.

[0079] In this way, on the premise of simplifying the number of structures of the air duct structure 100, the first blocking blocks 4211 and the second blocking blocks can be combined, which is convenient for processing or assembling components inside the air duct structure 100.

[0080] In some embodiments, please refer to Figure 2 , the mixing chamber 10 extends along a preset direction X. The outlet end of the air inlet member 20 communicating with the mixing chamber 10 is arranged at one end of the mixing chamber 10 along the preset direction X. In this way, by arranging the outlet end of the air inlet member 20 at one end of the mixing chamber 10 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 10, which can not only make the mixed gas fill or approximately fill the mixing chamber 10; but also extend the mixing path and improve the mixing uniformity.

[0081] Among them, the preset direction X can be the length direction of the mixing chamber 10 or the width direction.

[0082] Specifically, the longitudinal section of the mixing chamber 10 is S-shaped. Along the first direction Y, the longitudinal section shape of the mixing chamber 10 is S-shaped. In this way, the flow paths of the combustion-supporting gas and the fuel gas in the mixing chamber 10 can be appropriately extended to increase the mixing time of the combustion-supporting gas and the fuel gas, thereby improving the mixing uniformity of the combustion-supporting gas and the fuel gas.

[0083] In some embodiments, please refer to Figure 6 , the present application provides a combustion device 1000. The combustion device 1000 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 10 away from the air inlet member 20 and communicates with the mixing chamber 10.

[0084] The above combustion device 1000 adopts the above air duct structure 100. During the combustion process, combustion-supporting gas can be introduced into the air inlet member 20; at the same time, fuel gas is introduced into the air inlet member 20 and / or the mixing chamber 10, so that the combustion-supporting gas and the fuel gas can be mixed at least in the mixing chamber 10. The gas after mixing can flow from the mixing chamber 10 into the burner 200 for combustion, thus realizing stable combustion.

[0085] Since the path for the internal fuel gas and the combustion-supporting gas to flow through the mixing section 21 of the air inlet member 20 is S-shaped, the mixing path of the fuel gas and the combustion-supporting gas can be extended, preventing the air flow from directly entering the mixing chamber 10, ensuring sufficient mixing time for the fuel gas and the combustion-supporting gas, and making the mixing between the fuel gas and the combustion-supporting gas more uniform.

[0086] In some embodiments, please refer to Figure 6 , the combustion device 1000 further includes a first gas delivery member 300 and a second gas delivery member 400. The first gas delivery member 300 is communicated with the air inlet member 20, and the second gas delivery member 400 is communicated with the burner 200; wherein, at least one of the first gas delivery member 300 and the second gas delivery member 400 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 member 300 and flow into the air inlet member 20. At the same time, combustion-supporting gas is blown into the air inlet member 20, and the combustion-supporting gas and the fuel gas are respectively mixed in the air inlet member 20 and the mixing chamber 10. After the mixed gas enters the burner 200, the mixed gas is ignited and burned in the combustion chamber to achieve high-efficiency and low-emission premixed combustion. When diffusion combustion is carried out, the first gas delivery member 300 is closed, and the fuel gas is controlled to be introduced into the second gas delivery member 400. After the fuel gas enters the burner 200 through the second gas delivery member 400, the combustion-supporting gas sequentially flows through the air inlet member 20 and the mixing chamber 10 into the burner 200. After the fuel gas and the combustion-supporting gas are respectively ejected from different combustion holes of the burner 200, they are ignited and burned in the burner 200 to achieve short flame and stable combustion of diffusion combustion under low load conditions. Thus, on the premise of realizing 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 within the full load adjustment range and reducing pollutant emissions, the number of parts of the air duct structure 100 is reduced, and the structure is simple and easy to assemble.

[0087] Optionally, there are various installation methods for the first gas delivery member 300 and the second gas delivery member 400. For example: the first gas delivery member 300 and the second gas delivery member 400 can be fixed by means of bolt connection, clamping, welding, etc.

[0088] In some embodiments, please refer to Figure 1 , Figure 6 and Figure 7, the burner 200 includes a first combustion module 210 and a second combustion module 220 nested with each other. The first combustion module 210 is provided with at least one first combustion hole 211, and the second combustion module 220 is provided with at least one second combustion hole 221. One of the first combustion hole 211 and the second combustion hole 221 is communicated with the mixing chamber 10, and the other of the first combustion hole 211 and the second combustion hole 221 is communicated with the second gas delivery member 400.

[0089] In this way, the mutually nested first combustion module 210 and second combustion module 220 can respectively introduce fuel gas and / or combustion-supporting gas into the first combustion hole 211 or the second combustion hole 221, so as to realize the switching between premixed combustion and diffusion combustion or make the premixed combustion and diffusion combustion proceed simultaneously.

[0090] Taking the first combustion hole 211 being communicated with the mixing chamber 10 and the second combustion hole 221 being communicated with the second gas delivery member 400 as an example.

[0091] During premixed combustion, the second gas delivery member 400 is closed, and the fuel gas is controlled to be introduced into the first gas delivery member 300 so that it flows into the intake member 20. At the same time, combustion-supporting gas is blown into the intake member 20, and the combustion-supporting gas and the fuel gas are respectively mixed in the intake member 20 and the mixing chamber 10. After the mixed gas is ejected from the first combustion hole 211, it is ignited and burned to achieve more complete combustion and less waste gas emission during premixed combustion. During diffusion combustion, the first gas delivery member 300 is closed, and the fuel gas is controlled to be introduced into the second gas delivery member 400. The fuel gas is ejected from the second combustion hole 221 through the second gas delivery member 400. At the same time, after the combustion-supporting gas passes through the intake member 20 and the mixing chamber 10 in sequence, it is ejected from the first combustion hole 211. The fuel gas and the combustion-supporting gas are ignited and burned in the combustion chamber to achieve short flame and stable combustion under low load conditions during diffusion combustion.

[0092] When the premixed combustion and the diffusion combustion proceed simultaneously, the fuel gas is controlled to be introduced into the first gas delivery member 300 so that the fuel gas flows into the intake member 20. At the same time, combustion-supporting gas is introduced into the intake member 20, and the combustion-supporting gas and the fuel gas are mixed in the intake member 20 and the mixing chamber 10. After the mixed gas is ejected from the first combustion hole 211, it is ignited and burned to achieve premixed combustion. At the same time, the fuel gas is controlled to be introduced from the second gas delivery member 400. After the fuel gas is ejected from the second combustion hole 221, the combustion-supporting gas in the mixed gas ejected from the first combustion hole 211 can be ignited with the fuel gas ejected from the second combustion hole 221 to achieve diffusion combustion.

[0093] It should be noted that the number of the first combustion holes 211 and the second combustion holes 221 can be designed to be multiple, and the first combustion holes 211 and the second combustion holes 221 can be arranged at intervals to ensure uniform flame emission. At the same time, the burner 200 further includes a housing, which is connected to the mixing chamber 10, and the first combustion module 210 and the second combustion module 220 are arranged inside the housing. In addition, the burner 200 may further include a water-cooling pipe, and at least part of the water-cooling pipe penetrates through the first combustion module 210 and / or the second combustion module 220 to cool the first combustion module 210 and / or the second combustion module 220.

[0094] In some embodiments, please refer to Figure 8 , the combustion device 1000 further includes a control valve 500, which is respectively connected to the first gas delivery member 300 and the second gas delivery member 400, and is used to selectively introduce the fuel gas into the first gas delivery member 300 and the second gas delivery member 400. It can be seen from this that when premixed combustion occurs, the control valve 500 controls the fuel gas to be introduced into the first gas delivery member 300 and then into the intake member 20. When diffusion combustion occurs, the control valve 500 controls the fuel gas to be introduced into the second gas delivery member 400, so that the fuel gas is directly introduced into the burner 200 for ignition and combustion, so as to achieve short flame and stable combustion under low load conditions for diffusion combustion.

[0095] In some embodiments, please refer to Figure 8 , the combustion device 1000 further includes a blower 600, and the blower 600 is communicated with one end of the intake member 20 away from the mixing chamber 10. In this way, the combustion-supporting gas is stably transported into the intake member 20 through the blower 600 to achieve stable combustion. At the same time, the blower 600 is communicated with one end of the intake member 20, making the spatial layout of the components in the combustion equipment more reasonable and saving space.

[0096] In some embodiments, the present application further provides a combustion system. The combustion system includes the combustion device 1000 in any of the above embodiments.

[0097] In some embodiments, the present application further provides a combustion equipment. The combustion equipment includes the combustion device 1000 in any of the above embodiments. Among them, the combustion equipment can be, but is not limited to, a gas water heater, a wall-mounted boiler, etc.

[0098] In some embodiments, the combustion device further includes an electrical box 800. The outer shell of the burner 200 includes a first outer shell 230 and a second outer shell 700. The inner sidewall of the first outer shell 230 encloses a combustion chamber. Both the first combustion holes 211 and the second combustion holes 221 communicate with the combustion chamber. The second outer shell 700 is disposed on the outer sidewall of the first outer shell 230. The first outer shell 230 and the second outer shell 700 are parallel and spaced apart. A gap is formed between the first outer shell 230 and the second outer shell 700 and is communicated with the water-cooling pipes of the burner 200, so that the water in the water-cooling pipes flows into the gap between the first outer shell 230 and the second outer shell 700. The water between the first outer shell 230 and the second outer shell 700 can absorb part of the heat in the high-temperature flue gas in the combustion chamber to reduce the temperature of the outer shell of the burner 200.

[0099] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0100] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on 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 modifications 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 shall be subject to the appended claims.

Claims

1. An air duct structure (100), characterized in that, Comprising: A mixing chamber (10) for communicating with a burner (200); An air inlet member (20) communicating with the mixing chamber (10), one end of the air inlet member (20) away from the mixing chamber (10) being for introducing combustion-supporting gas, and at least one of the mixing chamber (10) and the air inlet member (20) being for introducing fuel gas; Wherein, the air inlet member (20) includes a mixing section (21), the mixing section (21) for the combustion-supporting gas and / or the fuel gas to flow through and enter the mixing chamber (10), and the flow path of the combustion-supporting gas and / or the fuel gas in the mixing section (21) is in an S shape.

2. The air duct structure according to claim 1, wherein At least two blocking blocks (21a) are provided on the inner wall of the mixing section (21), and along the extending direction of the mixing section (21), the at least two blocking blocks (21a) are staggeredly distributed, and the longitudinal cross-section of the cavity formed by the blocking blocks (21a) and the inner wall of the mixing section (21) is in an S shape.

3. The air duct structure according to claim 1, wherein, The air inlet member (20) further includes a blowing section (22), the blowing section (22) communicating with the mixing section (21), the blowing section (22) for introducing the combustion-supporting gas and the fuel gas, and one end of the mixing section (21) away from the blowing section (22) communicating with the mixing chamber (10).

4. The air duct structure according to claim 3, characterized in that, The air inlet member (20) further includes a diffusing section (23), the diffusing section (23) being connected between the blowing section (22) and the mixing section (21), and the cross-sectional area of the diffusing section (23) gradually increases from the end where the diffusing section (23) is connected to the blowing section (22) to the end where the diffusing section (23) is connected to the mixing section (21).

5. The air duct structure according to claim 4, characterized in that, The air duct structure (100) further includes a turbulator (30), the turbulator (30) being provided in the diffusing section (23) and / or the blowing section (22) and for mixing the fuel gas and the combustion-supporting gas in the diffusing section (23).

6. The air duct structure according to claim 5, characterized in that, The structure of the turbulator (30) is configured in a fan blade shape.

7. The air duct structure according to claim 3, characterized in that, The path for the combustion-supporting gas and the fuel gas to flow in the blowing section (22) is in an arc shape.

8. The air duct structure according to claim 7, characterized in that, The blowing section (22) includes a first part (22a) and a second part (22b) that are sequentially connected, the second part (22b) communicating with the mixing section (21) through the first part (22a), the second part (22b) for introducing the fuel gas, and one end of the second part (22b) away from the first part (22a) for introducing the combustion-supporting gas; Wherein, the first part (22a) is bent relative to the first part (22a).

9. The air duct structure according to claim 1, characterized in that The mixing chamber (10) and the air inlet member (20) are integrally formed.

10. The air duct structure according to claim 2, characterized in that, The air duct structure (100) includes a first housing (40) and a second housing (50), the first housing (40) including a first mixing part (41) and a first air inlet part (42), and the second housing (50) including a second mixing part (51) and a second air inlet part (52); The first housing (40) is hermetically connected to the second housing (50) so that the first mixing portion (41) and the second mixing portion (51) form the mixing chamber (10), and the first air inlet portion (42) and the second air inlet portion (52) form the air inlet member (20); Wherein, the first mixing portion (41) and the first air inlet portion (42) are of an integrated structure; and / or, the second mixing portion (51) and the second air inlet portion (52) are of an integrated structure.

11. The air duct structure according to claim 10, characterized in that, Of the two mating surfaces of the first housing (40) and the second housing (50) facing each other, a positioning protrusion (53) is provided on one of them, and a positioning groove (54) for inserting the positioning protrusion (53) is provided on the other.

12. The air duct structure (100) according to claim 10, characterized in that, The first air inlet portion (42) includes a first mixing section (421), the first mixing section (421) includes at least two first blocking blocks (4211), the second air inlet portion (52) includes a second mixing section, the second mixing section includes at least two second blocking blocks, and the number and positions of the first blocking blocks (4211) and the second blocking blocks correspond one by one, so that after the first housing (40) and the second housing (50) are hermetically connected, any one of the blocking blocks (21a) is formed by sealing and connecting one of the first blocking blocks (4211) and a corresponding second blocking block.

13. The air duct structure (100) according to any one of claims 1-12, characterized in that, The mixing chamber (10) extends in a preset direction, and the outlet end of the air inlet member (20) communicating with the mixing chamber (10) is arranged at one end of the mixing chamber (10) along the preset direction.

14. The air duct structure (100) according to any one of claims 1-12, characterized in that, The longitudinal section of the mixing chamber (10) is S-shaped.

15. A combustion device (1000), characterized in that, Including: A burner (200); The air duct structure (100) according to any one of claims 1-14, the burner (200) is arranged on a side of the mixing chamber (10) away from the air inlet member (20) and communicates with the mixing chamber (10).

16. The combustion device (1000) according to claim 15, characterized in that, The combustion device (1000) further includes a first gas delivery member (300) and a second gas delivery member (400), the first gas delivery member (300) communicates with the air inlet member (20), and the second gas delivery member (400) communicates with the burner (200); Wherein, at least one of the first gas delivery member (300) and the second gas delivery member (400) is used for introducing the fuel gas.

17. The combustion device (1000) according to claim 16, characterized in that, The burner (200) includes a first combustion module (210) and a second combustion module (220) nested with each other, the first combustion module (210) is provided with at least one first combustion hole (211), the second combustion module (220) is provided with at least one second combustion hole (221), one of the first combustion hole (211) and the second combustion hole (221) communicates with the mixing chamber (10), and the other of the first combustion hole (211) and the second combustion hole (221) communicates with the second gas delivery member (400).

18. The combustion device (1000) according to claim 16, characterized in that, The combustion device (1000) further includes a control valve (500), which is respectively connected to the first gas delivery member (300) and the second gas delivery member (400), and is configured to selectively introduce the fuel gas into the first gas delivery member (300) and the second gas delivery member (400); and / or, The combustion device (1000) further includes a blower (600), which is communicated with one end of the air intake member (20) away from the mixing chamber (10).

19. A combustion system, characterized in that, The combustion system includes the combustion device (1000) according to any one of claims 15-18.

20. A combustion device, characterized in that, The combustion equipment includes the combustion device (1000) according to any one of claims 15-18.

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