Air duct gas mixing structure and gas water heating equipment

Abstract

The air duct gas mixing structure comprises an outer shell and an inner shell, the outer shell comprises a gas inlet section, the inner shell is arranged in the gas inlet section, a first air duct is formed in the inner shell, a second air duct is formed between the inner shell and the gas inlet section, and the inner shell is provided with a first gas inlet communicating with the first air duct; the air inlet section is provided with a second air inlet communicated with the second air duct, the first air inlet is used for introducing a first medium, the second air inlet is used for introducing a second medium, one of the fuel gas and the combustion-supporting gas is the first medium, the other of the fuel gas and the combustion-supporting gas is the second medium, at least two overflowing holes are formed in the inner shell, and the overflowing holes are communicated with the first air duct. And each overflowing hole is communicated with the first air duct and the second air duct. Therefore, according to the air duct gas mixing structure, gas mixing is simple, mixed fuel gas which is more uniform in mixing and more suitable in proportion can be formed, and the combustion efficiency of the fuel gas water heating equipment is improved.

Description

Technical Field

[0001] The present application relates to the technical field of water heaters, and particularly to an air duct gas mixing structure and a gas water heating device. 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. Because of its advantages such as high efficiency, fast water outlet, stable and adjustable water temperature, and continuous use, it has become the first choice product in the domestic gas appliance market.

[0003] In a traditional premixed combustion water heater, premixed combustion requires mixing gas with a certain proportion of primary air in the burner, and then participating in combustion together with secondary air, and providing the space required for combustion through the combustion chamber, and the combustion is stable. And premixed combustion requires designing a separate gas mixing structure to control the intake air volume of gas and air, ensure uniform mixing of gas and air, and prevent flashback and flameout during the combustion process.

[0004] However, in the existing premixed combustion gas mixing structure, an explosion-proof fan is generally used to mix gas and air in advance inside the fan. The system structure and assembly process are complex, the cost is high, and there are potential safety hazards. Summary of the Invention

[0005] Based on this, in view of the problems such as the complex gas mixing structure and potential safety hazards of the premixed combustion water heater, the present application provides an air duct gas mixing structure and a water heater, and the air duct gas mixing structure and the water heater have the technical effects of simple gas mixing structure and safety.

[0006] An air duct gas mixing structure for a gas water heating device, comprising:

[0007] An outer housing including an air intake section;

[0008] An inner housing disposed in the air intake section, a first air duct is formed inside the inner housing, and a second air duct is formed between the inner housing and the air intake section;

[0009] The inner housing is provided with a first air inlet communicating with the first air duct, the air intake section has a second air inlet communicating with the second air duct, the first air inlet is used for introducing a first medium, the second air inlet is used for introducing a second medium, and one of the fuel gas and the combustion-supporting gas is the first medium, and the other of the fuel gas and the combustion-supporting gas is the second medium;

[0010] Wherein, at least two flow holes are provided on the inner housing, and each flow hole communicates the first air duct and the second air duct.

[0011] Thus, the air duct gas mixing structure provided by the present application has simple gas mixing and can make the distribution of the second medium entering the first air duct more uniform and the contact with the first medium more sufficient. When applied to a gas water heater, it can form a mixed gas with more uniform mixing and more suitable proportion, improving the combustion efficiency of the gas water heater.

[0012] In one embodiment, at least two of the flow holes are arranged along the air flow direction in the first air duct.

[0013] In one embodiment, along the air flow direction in the first air duct, the apertures of all the flow holes gradually increase.

[0014] In one embodiment, along the air flow direction in the first air duct, the cross-sectional area of the first air duct gradually increases.

[0015] Thus, when a fixed amount of the first medium enters the first air duct, at the beginning of entry, the cross-sectional area of the inner housing is the smallest and the flow velocity is the largest. As the first medium flows, the first air duct gradually narrows and the flow velocity of the first medium slows down. The speed at which the second medium enters the first air duct from the second air duct is larger upstream and smaller downstream in the first air duct, making the change trend of the second medium entering the first air duct the same as that of the first medium itself, so that they can be mixed more evenly.

[0016] In one embodiment, the flow holes are arranged at intervals and evenly along the outer circumference of the inner housing; and / or

[0017] The flow holes are arranged at intervals and evenly along the air flow direction in the inner housing, and the plane where the outer circumference is located intersects with the air flow direction.

[0018] Thus, the uniformity of the distribution of the second medium in the first air duct is improved, thereby improving the uniformity of the mixing of the first medium and the second medium.

[0019] In one embodiment, the outer housing further includes a premixing section, the inside of the premixing section has a premixing chamber, a first air inlet is formed on one side of the inner housing away from the premixing chamber, and the outlet of the first air duct is communicated with the premixing chamber.

[0020] Thus, the setting of the premixing chamber is convenient for subsequently transferring the mixed gas to the combustion chamber of the gas water heating device through the premixing outlet for combustion. At the same time, the existence of the premixing chamber can also prevent the docking of the combustion chamber and the air duct gas mixing structure from affecting the mixing of the first medium and the second medium, and can store a certain amount of mixed gas to ensure that a uniformly mixed mixed gas can be continuously provided to the combustion chamber.

[0021] In one embodiment, the distance L1 between the first air inlet and the second air inlet, and the distance L2 between the second air inlet and the outlet of the first air duct, the ratio of L2 to L1 is greater than 1.

[0022] In this way, after the second medium enters the second air duct, it can flow along a relatively long path to mix with the first medium in the first air duct 21, extending the premixing path and improving the premixing effect.

[0023] In one embodiment, the air duct mixing structure has an air inlet member, one end of the air inlet member is communicated with the first air inlet, and the other end is communicated with the air inlet assembly and is used for introducing the first medium.

[0024] In this way, when the air inlet assembly is an air pump, air enters the air inlet member of the air duct mixing structure through the air pump, and with the pumping of the air pump, enters the first air duct and flows along the set direction, so as to realize the directional flow of the air flow in the first air duct. After the second medium enters the second air duct through the second air inlet, it enters the first air duct through the flow holes and flows directionally with the air along with the pumping of the air pump.

[0025] In one embodiment, the opposite ends of the air inlet section are hermetically connected to the outer wall of the inner housing forming the outlet of the first air duct and the outer wall of the inner housing forming the first air inlet.

[0026] In one embodiment, along the air flow direction in the first air duct, the cross-sectional area of the second air duct first increases and then decreases.

[0027] In this way, a sealed second air duct is formed, so that the gas in the second air duct can only enter from the second air inlet. The end point of the second air duct is the part where the air inlet section fits with the outer wall of the inner housing. The air flow in the second air duct flows in the closed second air duct and can only enter the first air duct through the flow holes, and cannot directly enter the premixing cavity.

[0028] In one embodiment, the outer housing includes a first half housing and a second half housing. One of the first half housing and the second half housing is integrally formed with the inner housing to form a first housing;

[0029] The first housing is hermetically connected to the other of the first half housing and the second half housing;

[0030] The first half housing, the second half housing, and the inner housing jointly define and form the second air duct.

[0031] In one embodiment, the inner housing is in a frustum shape, so that it is convenient to form a second air duct with a gradually increasing cross-sectional area.

[0032] According to another aspect of the present application, there is also provided a gas water heating device, including the air duct gas mixing structure of any one of the above.

[0033] The above air duct gas mixing structure can introduce gas into the second air duct between the inner housing and the outer housing through the second air inlet, introduce air into the first air duct inside the inner housing through the first air inlet, and at the same time, a plurality of flow holes are provided on the inner housing, so that the second medium can gradually and uniformly mix with the first medium while flowing in the air duct gas mixing structure. The structure is simple and the mixing is uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 The first partial three-dimensional structure schematic diagram of the air duct gas mixing structure provided for one or more embodiments;

[0035] Figure 2 For Figure 1 The second partial structure schematic diagram of the air duct gas mixing structure provided in

[0036] Figure 3 For Figure 1 The first perspective plane structure schematic diagram of the air duct gas mixing structure provided in

[0037] Figure 4 For Figure 1 The second perspective structure schematic diagram of the air duct gas mixing structure provided in

[0038] Reference numerals: 100, air duct gas mixing structure; 10, outer housing; 10a, first half housing; 10b, second half housing; 12, intake section; 121, second air inlet; 13, premixing section; 131, premixing chamber; 132, premixing outlet; 14, intake member; 20, inner housing; 21, first air duct; 22, first air inlet; 23, flow hole; 30, second air duct; 50, flange. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0039] In order to make the above objects, features and advantages of the present application more obvious and understandable, the following detailed description of the specific embodiments of the present application will be given with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand 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.

[0040] In the description of the present application, it should be understood that if there are terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the drawings. These 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. Therefore, it should not be construed as a limitation to the present application.

[0041] In addition, if there are terms such as "first" and "second", these terms are only used for descriptive purposes and should not be construed 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 there is a term "plurality", the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0042] In the present application, unless otherwise clearly defined and limited, if there are terms such as "mounted", "connected", "connected to", "fixed", etc., these terms should 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 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.

[0043] In the present application, unless otherwise clearly defined and limited, if there is a description such as a first feature being "on" or "under" a second feature, the meaning 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 mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height 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 has a lower horizontal height than the second feature.

[0044] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may 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 present, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are only for illustrative purposes and do not represent the only implementation.

[0045] Generally, a gas water heating device mainly consists of a combustion system, a heat exchange system, a smoke exhaust system and a temperature control system. Among them, the combustion system and the heat exchange system occupy two-thirds of the volume of the entire gas water heating device and are the main structures of the gas water heating device.

[0046] According to the different forms of the combustion system and the heat exchange system, the gas water heating device is divided into diffusion combustion, atmospheric combustion and premixed combustion. For premixed combustion, a separate gas mixing device and a duct assembly need to be designed to mix gas and air in a certain amount and then enter the combustion chamber for combustion, so that the combustion process does not flashback or blow off fire.

[0047] In order to reduce the volume of the gas water heating device, the existing premixed combustion gas mixing structure generally uses an explosion-proof fan to mix gas and air in advance inside the fan. The system structure and assembly process are complex, the cost is high, there are potential safety hazards, and the current duct assembly for mixing gas and air has a low degree of uniform mixing of gas and air, which will affect the combustion efficiency and reliability of the gas water heating device.

[0048] To solve the above problems, the present application provides a gas water heating device, which can provide a duct gas mixing structure with simple structure, simple assembly and uniform gas mixing to improve the combustion efficiency and reliability of the gas water heating device.

[0049] Specifically, referring to Figures 1 to 4 , the duct gas mixing structure 100 includes an outer housing 10 and an inner housing 20. The outer housing 10 includes an air inlet section 12. The inner housing 20 is disposed in the air inlet section 12 and a first air duct 21 is formed inside the inner housing 20. A second air duct 30 is formed between the inner housing 20 and the air inlet section 12. The inner housing 20 is provided with a first air inlet 22 communicating with the first air duct 21. The air inlet section 12 has a second air inlet 121 communicating with the second air duct 30. The first air inlet 22 is used to introduce a first medium, and the second air inlet 121 is used to introduce a second medium. One of the fuel gas and the combustion-supporting gas is the first medium, and the other of the fuel gas and the combustion-supporting gas is the second medium. Wherein, at least two flow holes 23 are provided on the inner housing 20, and each flow hole 23 communicates the first air duct 21 and the second air duct 30.

[0050] The flow-through hole 23 can be set to a circular, square or any other regular or irregular shape. Its aperture is proportional to the flow-through area formed by it. The larger the aperture, the larger the flow-through area and the smaller the flow velocity of the airflow passing through. On the contrary, the smaller the aperture, the smaller the flow-through area and the larger the flow velocity of the airflow passing through.

[0051] During actual gas mixing, the first inlet 22 introduces the first medium (one of the fuel gas and the combustion-supporting gas) into the first air duct 21 of the inner housing 20, and the second inlet 121 introduces the second medium (the other of the fuel gas and the combustion-supporting gas) into the second air duct 30. While the first medium flows in the first air duct 21 along the set direction, the second medium in the second air duct 30 flows along the second air duct 30 and enters the first air duct 21 through the flow-through holes 23 at different positions to be mixed with the first medium, thereby forming a mixed gas of fuel gas and combustion-supporting gas, so that the combustion-supporting gas can provide a combustion-supporting effect during the later combustion of the fuel gas.

[0052] Moreover, the second medium in the second air duct 30, while flowing in the second air duct 30, enters the first air duct 21 through the flow-through holes 23 at multiple different positions, and along with the flow of the first medium in the first air duct 21, is fully mixed with the first medium at different positions, reducing the situation of local uneven mixing.

[0053] In this way, the air duct gas mixing structure 100 provided by the present application has simple gas mixing, and can make the distribution of the second medium entering the first air duct 21 more uniform and the contact with the first medium more sufficient. When applied to a gas water heater, it can form a mixed gas with more uniform mixing and more suitable proportion, improving the combustion efficiency of the gas water heater.

[0054] In one embodiment, as Figure 1 and Figure 2 , the outer housing 10 includes a first half housing 10a and a second half housing 10b. One of the first half housing 10a and the second half housing 10b is integrally formed with the inner housing 20 to form a first housing, and the first housing is hermetically connected to the other of the first half housing 10a and the second half housing 10b. The first half housing 10a, the second half housing 10b, and the inner housing 20 together define and form the second air duct 30.

[0055] In this way, when assembling the air duct gas mixing structure 100 of the present application, it is only necessary to hermetically connect the first half housing 10a and the second half housing 10b through external welding or screws and sealing medium. The assembly structure is simple, and the second air duct 30 can be formed between the inner wall of the first half housing 10a and the second half housing 10b facing the inner housing 20 and the outer wall of the inner housing 20.

[0056] In one embodiment, at least two flow holes 23 are arranged along the air flow direction L in the first air duct 21.

[0057] While the first medium in the first air duct 21 flows in a set direction, the second medium enters the first air duct 21 from different positions, such as entering the first air duct 21 from the downstream and the middle reaches of the first air duct 21 respectively, so that the second medium can be premixed with the first medium at different positions along the air flow direction L of the first air duct 21, making the distribution of the formed mixed gas more uniform along the air flow direction L of the first air duct 21.

[0058] Furthermore, it is set that the aperture diameters of all the flow holes 23 gradually increase along the air flow direction L, so as to control the flow velocity of the second medium entering the first air duct 21.

[0059] Specifically, when the second medium initially flows into the second air duct 30, the flow velocity of the second medium entering the first air duct 21 through the flow holes 23 with small aperture diameters becomes larger. At the upstream of the first air duct 21, the second medium quickly enters the first air duct 21 to be mixed with the first medium. When the second medium flows to the end of the second air duct 30, the flow velocity through the flow holes 23 with large aperture diameters becomes smaller, so that at the downstream of the first air duct 21, the mixing velocity of the second medium and the first medium is slowed down while ensuring the flow rate of the second medium, thereby further improving the uniformity of the mixing of the first medium and the second medium.

[0060] In some embodiments, along the air flow direction L in the first air duct 21, the cross-sectional area of the first air duct 21 gradually increases.

[0061] It can be understood that the larger the cross-sectional area of the first air duct 21 is, the larger the flow area is. On the contrary, the smaller the cross-sectional area of the first air duct 21 is, the smaller the flow area is. For example, when the cross-section of the first air duct 21 is circular, the gradual increase of its cross-sectional area means the gradual increase of its diameter.

[0062] When a fixed amount of the first medium enters the first air duct 21, at the beginning of the entry, the cross-sectional area of the inner shell 20 is the smallest and the flow velocity is the largest. As the first medium flows, the first air duct 21 gradually narrows, the flow velocity of the first medium slows down, and the velocity of the second medium entering the first air duct 21 from the second air duct 30 is larger at the upstream of the first air duct 21 and smaller at the downstream, making the change trend of the second medium entering the first air duct 21 the same as the change trend of the first medium itself, so that they can be more evenly mixed.

[0063] Specifically, the gradual reduction of the first air duct 21 can be achieved by the inner housing 20. For example, the inner housing 20 can have various shapes, such as a frustum of a cone, a prism, or other irregular shapes with gradually decreasing cross-sectional dimensions. Along the air flow direction of the first air duct 21 inside, a plurality of flow-through holes 23 of any shape can be provided on its outer peripheral surface.

[0064] In one embodiment, the flow-through holes 23 are arranged at intervals and uniformly along the outer circumference of the inner housing 20, and / or the flow-through holes 23 are arranged at intervals and uniformly along the air flow direction L inside the inner housing 20. The plane where the outer circumference is located intersects the air flow direction L. The plane where the outer circumference is located can be considered as the cross-section of the inner housing 20 in the air flow direction.

[0065] Thus, the second medium in the second air duct 30 surrounding the outer periphery of the inner housing 20 can enter the first air duct 21 uniformly along the outer circumference of the inner housing 20 and / or enter the first air duct 21 uniformly along the air flow direction L, further improving the uniformity of the distribution of the second medium in the first air duct 21, and thus improving the uniformity of the mixing of the first medium and the second medium.

[0066] Specifically, all the flow-through holes 23 can be arranged in a matrix. For example, N columns are formed along the air flow direction L of the second air duct 30, and M rows are formed along the outer circumference of the inner housing 20, thus forming a matrix arrangement of flow-through holes 23 of N*M, making the distribution of the second medium entering the first air duct 21 more uniform.

[0067] In one embodiment, along the air flow direction L of the second air duct 30, the second air inlet 121 is located between the first air inlet 22 and the outlet of the first air duct 21.

[0068] The first air inlet 22 is the most downstream of the first air duct 21, and the outlet of the first air duct 21 is the most upstream of the first air duct 21. The second air inlet 121 is arranged to introduce the second medium between the most downstream and the most upstream of the first air duct 21, ensuring that the second medium is fully mixed with the first medium in the first air duct 21 during the flow of the second medium.

[0069] Furthermore, the second air inlet 121 is arranged closer to the first air inlet 22. The distance L1 between the first air inlet 22 and the second air inlet 121, and the distance L2 between the second air inlet 121 and the outlet of the first air duct 21. The ratio of L2 to L1 is greater than 1, that is, L2 is greater than L1. The distance between the first air inlet 22 and the second air inlet 121 is less than the distance between the outlet of the first air duct 21 and the second air inlet 121.

[0070] The second air inlet 121 is arranged to be closer to the first air inlet 22 than the outlet of the first air duct 21. In this way, after the second medium enters the second air duct 30, it can flow along a longer path to mix with the first medium in the first air duct 21, extending the premixing path and improving the premixing effect.

[0071] In one embodiment, the outer housing 10 has an air inlet member 14. One end of the air inlet member 14 is communicated with the first air inlet 22, and the other end is communicated with the air inlet assembly and is used for introducing the first medium.

[0072] For example, when the air inlet assembly is an air pump, the first medium is air and the second medium is gas. The air enters the air inlet member 14 through the air pump, and with the pumping of the air pump, it enters the first air duct 21 and flows in a set direction, so as to realize the directional flow of the air flow in the first air duct 21. After the second medium enters the second air duct 30 through the second air inlet 121, it enters the first air duct 21 through the flow holes 23 and, with the pumping of the air pump, flows directionally together with the air.

[0073] Furthermore, the air duct premixing structure 100 further includes a flange 50. The flange 50 is arranged on the outer periphery of the second air inlet 121 and is located outside the second air duct 30, so as to be fixedly arranged with the pipeline for transmitting gas into the outer housing 10.

[0074] In a specific embodiment, when the inner housing 20 is frustum-shaped, the aperture of the flow hole 23 can be set from 3 mm to 6 mm from small to large, the diameter of the first air inlet 22 is 42 mm, the diameter of the outlet of the first air duct 21 is 54 mm, the aperture of the second air inlet 121 can be set to 9 mm, and the air inlet member 14 can be a tubular structure with a diameter of 48 mm. In this way, a set of air duct premixing structure 100 with better mixing effect is formed.

[0075] In other embodiments, the aperture of the flow hole 23, the diameter of the first air inlet 22, the diameter of the outlet of the first air duct 21, the aperture of the second air inlet 121, and the aperture of the air inlet member 14 can be set in other ranges, which are not limited in this application.

[0076] In one embodiment, the outer housing 10 further includes a premixing section 13. The premixing section 13 has a premixing chamber 131 inside. One side of the inner housing 20 away from the premixing chamber 131 forms the first air inlet 22, and the outlet of the first air duct 21 is communicated with the premixing chamber 131.

[0077] The first medium enters the first air duct 21 from the first air inlet 22 on the side of the inner housing 20 away from the premixing chamber 131. After the second medium enters the first air duct 21 when flowing through the air intake section 12 and is sufficiently premixed with the first medium over a long distance, the formed mixed gas then enters the premixing chamber 131 through the outlet of the first air duct 21. One end of the premixing chamber 131 away from the outlet of the first air duct 21 forms a premixing outlet 132, so as to facilitate the subsequent transfer of the mixed gas through the premixing outlet 132 to the combustion chamber of the gas water heater for combustion. At the same time, it can also prevent the docking of the combustion chamber and the air duct gas mixing structure 100 from affecting the mixing of the first medium and the second medium.

[0078] Furthermore, the presence of the premixing chamber 131 can store a certain amount of mixed gas to ensure continuous supply of uniformly mixed gas to the combustion chamber.

[0079] In one embodiment, the opposite ends of the air intake section 12 are hermetically connected to the outer wall of the inner housing 20 forming the outlet of the first air duct 21 and the outer wall of the inner housing 20 forming the first air inlet 22, so that the gas in the second air duct 30 can only enter from the second air inlet 121. The end point of the second air duct 30 is the part where the outer wall of the air intake section 12 fits with the inner housing 20. The air flow in the second air duct 30 flows in the closed second air duct 30 and can only enter the first air duct 21 through the flow holes 23 and cannot directly enter the premixing chamber 131.

[0080] Furthermore, along the air flow direction L in the first air duct 21, the cross-sectional area of the second air duct 30 gradually decreases.

[0081] Specifically, the second air duct 30 is defined between the air inlet section and the outer wall of the inner housing 20. Therefore, the second air duct 30 is an air flow channel annularly arranged outside the inner housing 20, and its specific size is determined by the air inlet section and the inner housing 20.

[0082] The air intake section 12 includes connecting parts at both ends and a working part between the connecting ends at both ends. The connecting parts are hermetically connected to the outer wall of the inner housing 20 forming the first air inlet 22 and the outer wall of the inner housing 20 forming the outlet of the first air duct 21. The working part is spaced from the outer wall of the inner housing 20 and forms the second air duct 30, and forms a closed second air duct 30 with a cross-section that first increases and then decreases, so that the second medium in the second air duct 30 can only enter through the second air inlet 121 and then discharge from the flow holes 23 of the second air duct 30.

[0083] Furthermore, the second air inlet 121 can be opened at the position with the largest cross-sectional area of the second air duct 30 to achieve rapid air intake.

[0084] In a specific embodiment, the complete premixing process of the gas water heater of the present application is as follows:

[0085] (1) Air passes through the intake assembly, enters the intake member 14, and enters the first air duct 21 through the first air inlet 22;

[0086] (2) Gas enters the second air duct 30 through the second air inlet 121;

[0087] (3) During the continuous pumping of air by the air pump, the gas in the second air duct 30 gradually enters the first air duct 21 through the flow holes 23 and is fully mixed with the air in the first air duct 21 to form a mixed gas;

[0088] (4) The mixed gas enters the premixing chamber 131 from the outlet of the first air duct 21 to complete the premixing process.

[0089] According to another aspect of the present application, the present application also provides an air duct structure as in the above-mentioned embodiment. The air duct structure can be used for premixing air and gas in a gas water heater, or can be used in other structures to achieve premixing of other first medium and second medium.

[0090] Further, the gas water heater further includes a combustion chamber, and the combustion chamber is communicated with the premixing chamber 131 of the air duct gas mixing structure 100, so as to fully burn the premixed mixed gas in the premixing chamber 131.

[0091] Thus, the gas water heater provided by the present application has simple gas mixing, and can form a mixed gas with more uniform mixing and more suitable ratio, improving the combustion efficiency of the gas water heater.

[0092] 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 described in this specification.

[0093] The above embodiments only represent 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 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 gas mixing structure, characterized in that, Comprising: An outer housing (10), including an intake section (12); An inner housing (20), disposed within the intake section (12), a first air duct (21) being formed within the inner housing (20), and a second air duct (30) being formed between the inner housing (20) and the intake section (12); The inner housing (20) is provided with a first air inlet (22) communicating with the first air duct (21), the intake section (12) has a second air inlet (121) communicating with the second air duct (30), the first air inlet (22) is used for introducing a first medium, the second air inlet (121) is used for introducing a second medium, and one of fuel gas and combustion-supporting gas is the first medium, and the other of fuel gas and combustion-supporting gas is the second medium; Wherein, at least two flow holes (23) are provided on the inner housing (20), and each flow hole (23) communicates the first air duct (21) and the second air duct (30).

2. The air duct gas mixing structure according to claim 1, characterized in that At least two of the flow holes (23) are arranged along the air flow direction (L) within the first air duct (21).

3. The air duct gas mixing structure according to claim 2, wherein Along the air flow direction (L) within the first air duct (21), the aperture of the flow hole (23) gradually increases.

4. The air duct gas mixing structure according to claim 1, characterized in that Along the air flow direction (L) within the first air duct (21), the cross-sectional area of the first air duct (21) gradually increases.

5. The air duct gas mixing structure according to claim 1, characterized in that, The flow holes (23) are arranged at intervals and uniformly along the outer circumference of the inner housing (20); and / or The flow holes (23) are arranged at intervals and uniformly along the air flow direction (L) within the inner housing (20), and the plane where the outer circumference is located intersects the air flow direction (L).

6. The air duct gas mixing structure according to claim 1, wherein, The outer housing (10) further includes a premixing section (13), and a premixing chamber (131) is formed inside the premixing section (13); One side of the inner housing (20) away from the premixing chamber (131) forms the first air inlet (22), and the outlet of the first air duct (21) communicates with the premixing chamber (131).

7. The air duct gas mixing structure according to claim 1, characterized in that, Along the air flow direction (L) of the second air duct (30), the second air inlet (121) is located between the first air inlet (22) and the outlet of the first air duct (21).

8. The air duct gas mixing structure according to claim 6, characterized in that, The distance L1 between the first air inlet (22) and the second air inlet (121), the distance L2 between the second air inlet (121) and the outlet of the first air duct (21), and the ratio of L2 to L1 is greater than 1.

9. The air duct gas mixing structure according to claim 1, characterized in that, The outer housing (10) further includes an intake member (14), one end of the intake member (14) communicates with the first air inlet (22), and the other end communicates with an intake assembly and is used for introducing the first medium.

10. The air duct gas mixing structure according to claim 1, wherein, The opposite ends of the intake section (12) are hermetically connected to the outer wall of the outlet of the first air duct (21) formed by the inner housing (20) and the outer wall of the first air inlet (22) formed by the inner housing (20).

11. The air duct gas mixing structure according to claim 10, characterized in that, Along the air flow direction (L) within the first air duct (21), the cross-sectional area of the second air duct (30) first increases and then decreases.

12. The air duct gas mixing structure according to claim 1, wherein, The inner housing (20) is in the shape of a frustum of a cone.

13. The air duct gas mixing structure according to claim 1, characterized in that, The outer housing (10) includes a first half housing (10a) and a second half housing (10b), one of the first half housing (10a) and the second half housing (10b) is integrally formed with the inner housing (20) to form a first housing; The first housing is sealingly connected to the other of the first half housing (10a) and the second half housing (10b); The first half housing (10a), the second half housing (10b), and the inner housing (20) jointly define and form the second air duct (30).

14. A gas water heating device, characterized in that, It includes the air duct mixing structure (100) according to any one of claims 1-13.

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