Air duct structure, fuel gas combustion equipment and combustion heat system

Abstract

The invention relates to an air duct structure, fuel gas combustion equipment and a combustion heat system. A swirler is arranged in a gas inlet piece and located at the downstream end of a fuel gas piece, so that entering fuel gas and combustion-supporting gas are mixed under the action of the swirler; and the mixed gas enters the air bin to be mixed again, so that the fuel gas and the combustion-supporting gas are fully mixed. Due to the fact that the ratio of the distance between the cyclone and the axis of the fuel gas piece to the inner diameter of the fuel gas piece is controlled to be 3-5, the space between the cyclone and the fuel gas piece and the inner diameter of the fuel gas piece are changed in a positive correlation mode. By means of the design, it can be guaranteed that the space between the swirler and the fuel gas piece can meet stable flowing of fuel gas in the fuel gas pieces of different sizes, the fuel gas and combustion-supporting gas are premixed at the upstream end of the swirler, it is avoided that due to the fact that the space of the upstream end of the swirler is insufficient, the fuel gas passes through the swirler in an accelerated mode, and the mixing degree of the fuel gas and the combustion-supporting gas is effectively enhanced; stable and efficient combustion is achieved, and heat efficiency is improved.

Description

Technical Field

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

[0002] A gas heating system refers to a device that utilizes the heat released by gas combustion to supply hot water or for heating, such as gas water heaters, wall-mounted boilers, etc. It has the characteristics of high efficiency, fast water output, stable water temperature adjustment, and continuous use, and has become the preferred hot water product for people.

[0003] The mixing process of gas and air is an important factor determining the nature of the combustion process. For example, in the case of flame combustion, characteristics such as the flame length, width, and temperature distribution will mainly depend on the mixing of gas and air. However, limited by the traditional air duct structure design, problems such as insufficient mixing of gas and air in the premixed combustion mode, low combustion efficiency, high pollutant emissions, and easy flashback occur. Summary of the Invention

[0004] Based on this, it is necessary to provide an air duct structure, a gas combustion device, and a gas heating system to optimize the structural design, effectively enhance the mixing degree of gas and combustion-supporting gas, achieve stable and efficient combustion, and improve the thermal efficiency.

[0005] An air duct structure, the air duct structure includes: a gas mixture, including an air inlet member and an air chamber communicated with the air inlet member, a gas member is communicated with the air inlet member, and the air chamber is used for communicating with a burner; a swirler is arranged on the inner wall of the air inlet member and is located at the downstream end of the gas member along the air flow direction in the air inlet member, and the swirler is used for mixing gas with combustion-supporting gas; the inner diameter of the gas member is denoted as D, and the distance between the end of the swirler facing away from the air chamber and the axis of the gas member is denoted as L1, wherein 3 ≤ L1 / D ≤ 5.

[0006] In the above air duct structure, a swirler is arranged in the air inlet member and is located at the downstream end of the gas member, so that the incoming gas and combustion-supporting gas are mixed under the action of the swirler; the mixed gas after mixing enters the air chamber for re-mixing, so that the gas and combustion-supporting gas are fully mixed. Since the ratio of the distance between the swirler and the axis of the gas member to the inner diameter of the gas member is controlled to be 3 - 5, therefore, in the structural design, the space between the swirler and the gas member changes positively with the inner diameter of the gas member. Designed in this way, it can ensure that the space between the swirler and the gas member can meet the smooth flow of gas in gas members of different sizes, so that the gas and combustion-supporting gas are premixed at the upstream end of the swirler, avoiding insufficient space at the upstream end of the swirler resulting in the gas accelerating through the swirler, so that the gas and combustion-supporting gas are mixed sufficiently under the action of the swirler, effectively enhancing the mixing degree of gas and combustion-supporting gas, achieving stable and efficient combustion, and improving the thermal efficiency.

[0007] In some of these embodiments, the inner diameter D of the gas component satisfies the condition: 6 mm ≤ D ≤ 16 mm.

[0008] In some of these embodiments, the inner diameter D of the gas component further satisfies the condition: 8 mm ≤ D ≤ 12 mm.

[0009] In some of these embodiments, the spacing L1 satisfies the condition: 27 mm ≤ L1 ≤ 45 mm.

[0010] In some of these embodiments, the spacing between the end of the swirler facing the air chamber and the end of the swirler facing away from the air chamber is denoted as L2, where 1 ≤ L2 / D ≤ 2.

[0011] In some of these embodiments, the spacing L2 satisfies the condition: 9 mm ≤ L2 ≤ 18 mm.

[0012] In some of these embodiments, the spacing between the end of the swirler facing the air chamber and the end of the air inlet component close to the air chamber is denoted as L3, where 2 ≤ L3 / D ≤ 4.

[0013] In some of these embodiments, the spacing L3 satisfies the condition: 18 mm ≤ L3 ≤ 36 mm.

[0014] In some of these embodiments, the swirler includes blades, and grooves are provided on the inner wall of the air inlet component, and the blades are arranged on the groove walls of the grooves.

[0015] In some of these embodiments, a first positioning member and a second positioning member are provided on the inner wall of the air inlet component at intervals along the air flow direction, the first positioning member is arranged farther away from the air chamber than the second positioning member, the first positioning member, the second positioning member and the inner wall of the air inlet component enclose to form the groove, the blades are arranged between the first positioning member and the second positioning member, and the distance between the side surface of the first positioning member facing the blades and the axis of the gas component is the spacing L1.

[0016] In some of these embodiments, a blocking member is provided on the inner wall of the air chamber, and the blocking member is used to block at least part of the mixed gas flowing out of the air inlet component.

[0017] In some of these embodiments, the air inlet component includes a gas blowing section, a diffusing section and a gas mixing section that are connected in sequence, the gas mixing section is communicated with the air chamber, the swirler is arranged on the inner wall of the gas mixing section, and the cross-sectional area of the diffusing section gradually increases from the end of the diffusing section close to the gas blowing section to the end of the diffusing section close to the gas mixing section.

[0018] A gas combustion device, the gas combustion device comprising: a burner; a duct structure as described in any one of the above, the burner communicating with the air chamber.

[0019] For the above gas combustion device, with the above duct structure, a swirler is provided in the intake member and is located at the downstream end of the gas member, so that the incoming gas and the combustion-supporting gas are mixed under the action of the swirler; the mixed gas after mixing enters the air chamber for re-mixing, so that the gas and the combustion-supporting gas are fully mixed. Since the ratio of the distance between the axis of the swirler and the gas member to the inner diameter of the gas member is controlled to be 3-5, therefore, in the structural design, the space between the swirler and the gas member changes in a positive correlation with the inner diameter of the gas member. Designed in this way, it can ensure that the space between the swirler and the gas member can meet the stable flow of the gas in gas members of different sizes, so that the gas and the combustion-supporting gas are premixed at the upstream end of the swirler, avoiding the insufficient space at the upstream end of the swirler resulting in the gas accelerating through the swirler, so that the gas and the combustion-supporting gas are fully mixed under the action of the swirler, effectively enhancing the mixing degree of the gas and the combustion-supporting gas, achieving stable and efficient combustion, and improving the thermal efficiency.

[0020] A gas heating system, the gas heating system comprising the above gas combustion device.

[0021] For the above gas heating system, with the above duct structure, a swirler is provided in the intake member and is located at the downstream end of the gas member, so that the incoming gas and the combustion-supporting gas are mixed under the action of the swirler; the mixed gas after mixing enters the air chamber for re-mixing, so that the gas and the combustion-supporting gas are fully mixed. Since the ratio of the distance between the axis of the swirler and the gas member to the inner diameter of the gas member is controlled to be 3-5, therefore, in the structural design, the space between the swirler and the gas member changes in a positive correlation with the inner diameter of the gas member. Designed in this way, it can ensure that the space between the swirler and the gas member can meet the stable flow of the gas in gas members of different sizes, so that the gas and the combustion-supporting gas are premixed at the upstream end of the swirler, avoiding the insufficient space at the upstream end of the swirler resulting in the gas accelerating through the swirler, so that the gas and the combustion-supporting gas are fully mixed under the action of the swirler, effectively enhancing the mixing degree of the gas and the combustion-supporting gas, achieving stable and efficient combustion, and improving the thermal efficiency. Description of the Drawings

[0022] Figure 1 The cross-section of the duct structure described in some embodiments of the present application Figure 1 。

[0023] Figure 2 The cross-section of the duct structure described in some embodiments of the present application Figure 2 。

[0024] Figure 3Schematic structural diagram of the combustion heating system described in some embodiments of the present application.

[0025] 100, air duct structure; 10, mixed gas; 11, air chamber; 111, blocking member; 12, air inlet member; 121, gas mixing section; 122, air blowing section; 12a, first part; 12b, second part; 123, gas expansion section; 124, groove; 13, gas component; 131, opening; 20, gas valve; 30, blower; 40, swirler; 41, blade; 42, first positioning member; 43, second positioning member; 200, burner; 300, water jacket; 400, controller; 500, power plug. Detailed implementation manners

[0026] To make the above objects, features, and advantages of the present application more apparent and understandable, the following will describe the detailed implementation manners of the present application with reference to the accompanying drawings. Many specific details are set forth in the following description to 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.

[0027] In the description of the present application, it should be understood that if these 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. appear, the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation of the present application.

[0028] In addition, if these terms "first" and "second" appear, these terms are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity 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, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0029] In this application, unless otherwise clearly defined and limited, if terms such as "installed", "connected", "joined", "fixed", etc. appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two 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.

[0030] In this application, unless otherwise clearly defined and limited, if there is a description such as the first feature being "on" or "under" the second feature, its meaning can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or just means 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 can be that the first feature is directly below or obliquely below the second feature, or just means that the first feature is at a lower horizontal level than the second feature.

[0031] 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 can also be an intermediate element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. If so, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in this application are only for the purpose of illustration and do not represent the only implementation.

[0032] In some embodiments, please refer to Figure 1 , this application provides an air duct structure 100, and the air duct structure 100 includes: a mixed gas 10 and a swirler 40. The mixed gas 10 includes an air inlet member 12 and an air chamber 11 communicating with the air inlet member 12. A gas member 13 is communicated with the air inlet member 12, and the air chamber 11 is used for communicating with a burner 200. The swirler 40 is disposed on the inner wall of the air inlet member 12 and is located at the downstream end of the gas member 13 along the air flow direction in the air inlet member 12. The swirler 40 is used for mixing gas and combustion-supporting gas. The inner diameter of the gas member 13 is denoted as D, and the distance between one end of the swirler 40 facing away from the air chamber 11 and the axis of the gas member 13 is denoted as L1, where 3 ≤ L1 / D ≤ 5.

[0033] For the above air duct structure 100, a swirler 40 is provided in the air inlet member 12 and is located at the downstream end of the gas member 13, so that the incoming gas and the combustion-supporting gas are mixed under the action of the swirler 40; the mixed gas after mixing enters the air chamber 11 for re-mixing, so that the gas and the combustion-supporting gas are fully mixed. Since the ratio of the distance between the axis of the swirler 40 and the gas member 13 to the inner diameter of the gas member 13 is controlled to be 3 to 5, therefore, in the structural design, the space between the swirler 40 and the gas member 13 changes positively with the inner diameter of the gas member 13. Designed in this way, it can ensure that the space between the swirler 40 and the gas member 13 can meet the stable flow of the gas in the gas members 13 of different sizes, so that the gas and the combustion-supporting gas are premixed at the upstream end of the swirler 40, avoiding insufficient space at the upstream end of the swirler 40 and resulting in the gas accelerating through the swirler 40, so that the gas and the combustion-supporting gas are fully mixed under the action of the swirler 40, effectively enhancing the mixing degree of the gas and the combustion-supporting gas, achieving stable and efficient combustion, and improving the thermal efficiency.

[0034] It should be noted that the air chamber 11 and the air inlet member 12 can be connected in a combined manner. For example, the air chamber 11 and the air inlet member 12 can be connected by welding, threaded connection, clamping, pin connection, etc.; they can also be designed as an integral structure. For example, they can be formed by injection, die-casting, 3D printing, etc.

[0035] Specifically, the air chamber 11 and the air inlet member 12 are of an integral structure. Designed in this way, by designing the air chamber 11 and the air inlet member 12 as an integral structure, the number of parts of the air duct structure 100 can be reduced, and the structure is simple and easy to assemble.

[0036] At the same time, the swirler 40 refers to a device that can stir the combustion-supporting gas and the gas in the air inlet member 12 to make the two fully mixed. The installation method of the swirler 40 in the air inlet member 12 can be but is not limited to bolt connection, clamping, riveting, welding, bonding, etc. Among them, the combustion-supporting gas can be but is not limited to air.

[0037] During premixed combustion, the fan 30 is connected to one end of the air inlet member 12, which is a device that provides the combustion-supporting gas and the flow power. At this time, the gas input in the gas member 13 and the combustion-supporting gas are premixed at the upstream end of the swirler 40 and are fully mixed under the action of the swirler 40; the mixed gas after mixing enters the air chamber 11 and flows from the air chamber 11 into the burner 200 for ignition and combustion.

[0038] In addition, the gas member 13 refers to a component that passes the gas into the air inlet member 12, and there are various installation methods of it on the air inlet member 12. For example, one end of the gas member 13 is welded to the side of the air inlet member 12 and is communicated with the inside of the air inlet member 12; or, one end of the gas member 13 penetrates into the air inlet member 12, etc. When one end of the gas member 13 penetrates into the air inlet member 12, please refer toFigure 2 A number of openings 131 are provided on the part of the gas component 13 extending into the intake component 12 so that gas can pass through the openings 131 and enter the intake component 12.

[0039] It should also be noted that one end of the swirler 40 facing away from the air chamber 11 can be understood as the gas inlet end of the swirler 40. When designing the distribution of the swirler 40, if the size of the gas component 13 is large, it means that the gas flow rate is large. At this time, if the space between the swirler 40 and the gas is designed to be small, it will affect the premixing effect of the gas and the combustion-supporting gas before the swirler 40. At the same time, if the upstream end space of the swirler 40 is small, it will increase the pressure of the gas in the intake component 12, causing the gas to accelerate through the swirler 40 and reducing the mixing effect. Therefore, the ratio of the distance between the axis of the swirler 40 and the gas component 13 to the inner diameter of the gas component 13 is controlled to be 3 - 5 to strengthen the mixing of the gas and the combustion-supporting gas.

[0040] Among them, L1 / D can take values between 3 and 5. For example, L1 / D can be, but is not limited to, 3, 3.2, 3.4, 3.6, 3.8, 4, 4.2, 4.4, 4.6, 4.8, 5, etc. Specifically in some embodiments, L1 / D can be 3.

[0041] Furthermore, please refer to Figure 1 the inner diameter D of the gas component 13 satisfies the condition: 6mm ≤ D ≤ 16mm. It can be seen that the inner diameter D of the gas component 13 can take values between 6mm and 16mm. For example, the inner diameter D can be, but is not limited to, 6mm, 7mm, 8mm, 9mm, 10mm, 12mm, 14mm, 16mm, etc. In this way, the inner diameter of the gas component 13 is reasonably controlled so that the distance between the axis of the swirler 40 and the gas component 13 is controlled within a reasonable range, ensuring full mixing of the gas and the combustion-supporting gas.

[0042] Even further, the inner diameter D of the gas component 13 also satisfies the condition: 8mm ≤ D ≤ 12mm. In this way, the value of the inner diameter D can be, but is not limited to, 8mm, 9mm, 10mm, 11mm, 12mm, etc. Specifically in some embodiments, the inner diameter D can be 9mm.

[0043] In some embodiments, please refer to Figure 1 the spacing L1 satisfies the condition: 27mm ≤ L1 ≤ 45mm. It can be seen that the value of the spacing L1 can be, but is not limited to, 27mm, 30mm, 35mm, 40mm, 45mm, etc. With such a design, the distribution of the swirler 40 in the intake component 12 is more reasonable, strengthening the mixing degree between the gas and the combustion-supporting gas and improving the combustion efficiency.

[0044] Of course, in other embodiments, the condition that the spacing L1 can also satisfy is: 27 mm ≤ L1 ≤ 36 mm. For example, the spacing L1 can be, but is not limited to, 27 mm, 28 mm, 29 mm, 30 mm, 31 mm, 32 mm, 33 mm, 34 mm, 35 mm, 36 mm. Specifically in some embodiments, the spacing L1 can be 27 mm.

[0045] In some embodiments, please refer to Figure 1 , the spacing between one end of the swirler 40 facing the air chamber 11 and the other end of the swirler 40 facing away from the air chamber 11 is denoted as L2, where 1 ≤ L2 / D ≤ 2. From this, it can be known that the spacing L2 can be understood as the thickness of the swirler 40. The greater the thickness of the swirler 40, the larger the internal design space of the swirler 40 can be increased, which is convenient for increasing the mixing ability of the fuel gas and the combustion-supporting gas. In this way, controlling the ratio of the spacing L2 of the swirler 40 to the inner diameter of the fuel gas component 13 between 1 and 2 enables the mixing ability of the swirler 40 to vary positively with the change in the fuel gas flow rate in the fuel gas component 13, further strengthening the mixing effect between the fuel gas and the combustion-supporting gas.

[0046] It should be noted that the swirler 40 can include blades 41, and the axis of the blades 41 is kept consistent with the air flow direction. Since the greater the inclination angle of the impeller relative to its own axis within a certain range, the greater the rotation rate driven by the air flow and the stronger the stirring ability of the fuel gas and the combustion-supporting gas. However, the greater the inclination angle, the greater the thickness of the swirler 40 in the air inlet component 12. The number of blades is not limited, for example: it can be, but is not limited to, 4, 6, 8, 12, 14, etc. In addition, it should be noted that when designing the thickness of the swirler 40, it cannot be too large; if it is too large, it will occupy too much space inside the air inlet component 12 and affect the air capacity inside the air inlet component 12.

[0047] Therefore, in this embodiment, the ratio of the spacing L2 of the swirler 40 to the inner diameter of the fuel gas component 13 is controlled between 1 and 2, making the structural design more reasonable. Specifically in some embodiments, L2 / D can be 1.

[0048] Furthermore, please refer to Figure 1 , the condition that the spacing L2 satisfies is: 9 mm ≤ L2 ≤ 18 mm. From this, it can be known that the value of the spacing L2 can be, but is not limited to, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, etc. Designed in this way, controlling the spacing L2 between 9 mm and 18 mm can reasonably design the thickness dimension of the swirler 40 on the premise of avoiding excessive occupation of the space inside the air inlet component 12, improve the mixing ability of the swirler 40 for the fuel gas and the combustion-supporting gas, and strengthen the mixing degree between the fuel gas and the combustion-supporting gas.

[0049] Of course, in other embodiments, the condition that the spacing L2 can also satisfy is: 9 mm ≤ L2 ≤ 12 mm. For example, the spacing L2 can be, but is not limited to, 9 mm, 10 mm, 11 mm, 12 mm. Specifically, in some embodiments, the spacing L2 can be 9 mm.

[0050] In some embodiments, please refer to Figure 1 , the spacing between the end of the swirler 40 facing the air chamber 11 and the end of the air inlet member 12 close to the air chamber 11 is denoted as L3, where 2 ≤ L3 / D ≤ 4. It can be seen from this that the spacing L3 represents the distance between the swirler 40 and the outlet end of the air inlet member 12, that is, the space through which the fuel gas and the combustion-supporting gas flow after passing through the swirler 40. This part of the space allows the flow disturbed by the swirler 40, so that the disturbed mixed gas can smoothly enter the air chamber 11, ensuring the stability of the flame on the burner 200. Of course, controlling the ratio between the spacing L3 and D within the range of 2 to 4 can also ensure that the thickness of the swirler 40 and the spacing between the swirler 40 and the fuel gas member 13 are within a reasonable range.

[0051] Among them, L3 / D can take values between 2 and 4. For example, L3 / D can be, but is not limited to, 2, 2.2, 2.4, 2.6, 2.8, 3, 3.2, 3.4, 3.6, 3.8, 4, etc. Specifically, in some embodiments, L3 / D can be 2.

[0052] Furthermore, the condition that the spacing L3 satisfies is: 18 mm ≤ L3 ≤ 36 mm. It can be seen from this that the value of the spacing L3 can be, but is not limited to, 18 mm, 19 mm, 20 mm, 22 mm, 24 mm, 26 mm, 28 mm, 30 mm, 34 mm, 36 mm, etc. Designed in this way, controlling the spacing L3 between 18 mm and 36 mm leaves enough space at the downstream end of the swirler 40, so that the fuel gas and the combustion-supporting gas after being disturbed can smoothly enter the air chamber 11, making the combustion more stable.

[0053] Of course, in other embodiments, the condition that the spacing L3 can also satisfy is: 18 mm ≤ L3 ≤ 27 mm. For example, the spacing L3 can be, but is not limited to, 18 mm, 19 mm, 20 mm, 22 mm, 24 mm, 26 mm, 27 mm. Specifically, in some embodiments, the spacing L3 can be 18 mm.

[0054] In some embodiments, please refer to Figure 1 , the spacing between the end of the swirler 40 facing the air chamber 11 and the axis of the fuel gas member 13 is denoted as L4, where 4 ≤ L4 / D ≤ 6. It can be seen from this that L4 / D can take values between 4 and 6. For example, L4 / D can be, but is not limited to, 4, 4.2, 4.4, 4.6, 4.8, 5, 5.2, 5.4, 5.6, 5.8, 6, etc. Specifically, in some embodiments, L4 / D can be 4.

[0055] Further, please refer to Figure 1 , the condition that the spacing L4 satisfies is: 36mm ≤ L4 ≤ 54mm.

[0056] It can be seen from this that the value of the spacing L4 can be but is not limited to 36mm, 38mm, 40mm, 42mm, 44mm, 46mm, 48mm, 50mm, 52mm, 54mm, etc. With such a design, by controlling the spacing L4 between 36mm and 54mm, the total distribution space between the cyclone 40 and the gas component 13 can be ensured.

[0057] Of course, in other embodiments, the condition that the spacing L4 can also satisfy is: 36mm ≤ L4 ≤ 45mm. For example: the spacing L4 can be but is not limited to 36mm, 38mm, 40mm, 42mm, 44mm, 45mm. Specifically in some embodiments, the spacing L4 can be 36mm.

[0058] In addition, in some embodiments, the inner diameter of the gas component 13 is designed to be 9mm; the spacing L1 between the end of the cyclone 40 facing away from the air chamber 11 and the axis of the gas component 13 is designed to be 27mm; the spacing L2 between the end of the cyclone 40 facing the air chamber 11 and the end of the cyclone 40 facing away from the air chamber 11 is designed to be 9mm; the spacing L3 between the end of the cyclone 40 facing the air chamber 11 and the end of the intake component 12 close to the air chamber 11 is designed to be 18mm. For the obtained air duct structure 100, a combustion test is carried out. In the experiment, it is evaluated by observing the flame color, recording the flue gas emission situation, etc. Among them, the experimental results are: NOx < 20ppm, CO < 200ppm.

[0059] In some embodiments, please refer to Figure 2 , the cyclone 40 includes blades 41, and a groove 124 is provided on the inner wall of the intake component 12, and the blades 41 are arranged on the groove wall of the groove 124. In this way, by installing the blades through the groove 124, it is not only convenient for installation, but also convenient for the blades to swirl the air flow in the intake component 12 and strengthen the mixing.

[0060] It should be noted that the blades 41 can be fixed in the groove 124 or can rotate around their own axes to further stir the mixing of the air flow.

[0061] The arrangement of the spoiler 40 in the groove 124 can keep the axis of the blades 41 in line with the axis of the gas mixing section 121, so that the combustion-supporting gas and the gas are more likely to impact on the blades to form a swirling effect. At the same time, the blades 41 can be designed at a certain inclination angle to increase the force-bearing area of the blades.

[0062] It should also be noted that the groove 124 can be formed in various ways on the inner wall of the air inlet member 12. For example, a groove can be directly dug on the inner wall of the air inlet member 12 to form the groove 124; or, convex structures can be arranged at intervals on the inner wall of the air inlet member 12 to form the groove 124 between the convex structures, etc.

[0063] Furthermore, please refer to Figure 1 With Figure 2 , a first positioning member 42 and a second positioning member 43 are arranged at intervals along the air flow direction on the inner wall of the air inlet member 12, and the first positioning member 42 is arranged farther away from the air storage chamber 11 than the second positioning member 43. The first positioning member 42, the second positioning member 43 and the inner wall of the air inlet member 12 enclose to form the groove 124. The blade 41 is arranged between the first positioning member 42 and the second positioning member 43, and the distance between the side surface of the first positioning member 42 facing the blade and the axis of the gas component 13 is the distance L1. In this way, through the first positioning member 42 and the second positioning member 43, the swirler 40 is stably installed in the air inlet member 12, which is beneficial to ensuring more stable mixing between the gas and the combustion-supporting gas.

[0064] It should be noted that the blade 41 refers to a structure that can disturb the gas and the combustion-supporting gas to achieve the mixing between the gas and the combustion-supporting gas. The blade 41 can be fixed or can rotate under the drive of the air flow to stir the gas and the combustion-supporting gas so that the two are mixed.

[0065] It should also be noted that the first positioning member 42 and the second positioning member 43 are respectively components for fixing the blade 41, and their connection methods can be but are not limited to bolt connection, clamping connection, welding, bonding, etc. Since the blade 41 is connected between the first positioning member 42 and the second positioning member 43, therefore, the distance L3 can be the distance between the side surface of the second positioning member 43 facing the blade and one end of the air inlet member 12 close to the air storage chamber 11, that is, the distance L3 includes the thickness of the second positioning member 43; the distance L1 is the distance between the side surface of the first positioning member 42 facing the swirler 40 and the axis of the gas component 13, that is, the distance L1 includes the thickness of the first positioning member 42. In addition, the distance L2 is the distance between the side surface of the first positioning member 42 facing the blade and the side surface of the second positioning member 43 facing the blade, that is, the distance L2 does not include the thicknesses of the first positioning member 42 and the second positioning member 43.

[0066] At the same time, both the first positioning member 42 and the second positioning member 43 can be designed as rib structures, and there are various designs for their shapes. For example, the shapes of the first positioning member 42 and the second positioning member 43 can be but are not limited to rectangle, trapezoid, etc. The connection methods of the first positioning member 42 and the second positioning member 43 on the inner wall of the air inlet member 12 can be but are not limited to bolt connection, welding, clamping connection, riveting, bonding, integral molding, etc. Among them, the integral molding can be but is not limited to injection molding, die casting, 3D printing, etc.

[0067] In addition, the arrangement of the cyclone 40 within the air inlet member 12 allows the axis of the vane 41 to be collinear with the axis of the air inlet member 12, such that the vane 41 is more likely to rotate under the impact of the combustion-supporting gas and the fuel gas.

[0068] In some embodiments, referring to Figure 1 , a blocking member 111 is provided on the inner wall of the air chamber 11. The blocking member 111 is used to block at least part of the mixed gas flowing out of the air inlet member 12. Thus, by providing the blocking member 111, the flow path of the mixed gas can be extended, allowing the mixed gas more time for sufficient mixing, thereby enabling the premixed combustion to be fully efficient.

[0069] It should be noted that the blocking member 111 refers to a component that can block at least part of the mixed gas, delaying or changing the original flow rate or flow direction of the mixed gas, but not restricting the continuous flow of the mixed gas within the air chamber 11. Here, the mixed gas refers to a mixture of fuel gas and combustion-supporting gas. It can be designed as a structure protruding from the inner wall of the air chamber 11, such as a block shape, a plate shape, etc., with a structure for blocking the flow of the mixed gas. To improve the blocking effect, the blocking member 111 can be designed as an inclined structure, for example, the end of the blocking member 111 away from the inner wall of the air chamber 11 is inclined towards the side of the air inlet member 12.

[0070] Meanwhile, the number of the blocking members 111 can be one or multiple. When the number of the blocking members 111 is multiple, there are also various distribution methods. For example, all the blocking members 111 are arranged at intervals along the direction of the gas flow on the inner wall of the air chamber 11; or they can be distributed at intervals around the outer periphery of the air inlet member 12, etc.

[0071] In some embodiments, referring to Figure 1 , the air inlet member 12 includes a gas-blowing section 122, a diffusing section 123, and a gas-mixing section 121 that are connected in sequence. The gas-mixing section 121 is connected to the air chamber 11, the cyclone 40 is provided on the inner wall of the gas-mixing section 121, and the cross-sectional area of the diffusing section 123 gradually increases from the end of the diffusing section 123 close to the gas-blowing section 122 to the end of the diffusing section 123 close to the gas-mixing section 121.

[0072] It can be seen therefrom that the gas-mixing section 121 is indirectly connected to the gas-blowing section 122, and the combustion-supporting gas in the gas-blowing section 122 enters the gas-mixing section 121 through the diffusing section 123. Since the cross-sectional area of the diffusing section 123 gradually increases from the end of the diffusing section 123 connected to the gas-blowing section 122 to the end of the diffusing section 123 connected to the gas-mixing section 121, the diffusing section 123 is in an expanding state, slowing down the flow rate of the combustion-supporting gas, expanding the range of the combustion-supporting gas entering the gas-mixing section 121, making the combustion-supporting gas evenly dispersed within the gas-mixing section 121, improving the mixing uniformity with the fuel gas, and enhancing the stability of combustion.

[0073] It should be noted that the air-blowing section 122, the air-expanding section 123 and the air-mixing section 121 can be connected in a combined manner; they can also be designed as an integrated structure, which can further simplify the number of parts of the air duct structure 100 and is easy to assemble.

[0074] In addition, for the convenience of understanding the cross-sectional area of the air-expanding section 123, Figure 1 take... as an example for illustration. The cross-section of the air-expanding section 123 is Figure 1 the area indicated by S in...

[0075] Furthermore, please refer to Figure 1 , the air-blowing section 122 includes a first part 12a and a second part 12b that are connected in sequence. The second part 12b is connected to the air-mixing section 121 through the first part 12a. One end of the second part 12b away from the first part 12a is used to introduce the combustion-supporting gas, and the second part 12b can also be used to input the fuel gas. Among them, the first part 12a is bent relative to the second part 12b. It can be seen from this that the first part 12a has a curved structure. In this way, the air-blowing section 122 is designed into a structure with mutual bending, so that when the combustion-supporting gas or the mixed gas (that is, the mixture of the combustion-supporting gas and the fuel gas) flows from the second part 12b into the first part 12a, its flow direction changes, causing the combustion-supporting gas to generate air flow disturbance in advance, which is beneficial to strengthening the mixing of the fuel gas and the combustion-supporting gas.

[0076] It should be noted that the bending angle between the first part 12a and the second part 12b can be selected between 0° (excluding the endpoints) and 180° (excluding the endpoints). At the same time, for the convenience of the smooth flow of the combustion-supporting gas between the first part 12a and the second part 12b, the first part 12a and the second part 12b should be smoothly connected.

[0077] It should also be noted that when the intake part 12 further includes the air-expanding section 123, one end of the first part 12a away from the second part 12b is connected to the air-expanding section 123, and one end of the air-expanding section 123 away from the second part 12b is connected to the air-mixing section 121. In this way, the combustion-supporting gas or the mixed gas can flow through the second part 12b, the first part 12a, the air-expanding section 123, the air-mixing section 121 and the mixing chamber 11 in sequence.

[0078] In addition, in addition to introducing the combustion-supporting gas at one end of the second part 12b itself, the fuel gas is also introduced into its interior. There can be various designs for the introduction position of the fuel gas on the second part 12b. For example: it can also be introduced from one end of the second part 12b and enter the second part 12b together with the combustion-supporting gas; it can also be introduced from the side of the second part 12b, etc.

[0079] In some embodiments, please refer to Figure 1The gas expansion section 122 includes a first part 12a and a second part 12b which are connected in sequence, and the second part 12b is connected to the gas expansion section 123 through the first part 12a. The second part 12b is used to input fuel gas, and the end of the second part 12b away from the first part 12a is used to pass the combustion-supporting gas; wherein the first part 12a is bent relative to the second part 12b. It can be seen that after the combustion-supporting gas and the fuel gas flow through the first part 12a, they enter the gas expansion section 123 to diffuse the distribution range of the mixed gas so that the mixed gas is evenly distributed.

[0080] In some embodiments, please refer to Figure 1 , the portion where the first portion 12a and the second portion 12b are connected is an arc-shaped curved structure, and the bending angle between the first portion 12a and the second portion 12b is denoted as θ, wherein 80°≤θ≤100°. It can be seen from this that the bending angle θ can be, but is not limited to, 80°, 85°, 90°, 95°, 100°, etc. In this way, the bending angle θ is controlled between 80° and 100°, so that the combustion-supporting gas in the second portion 12b is greatly blocked before flowing into the first portion 12a, so that the combustion-supporting gas generates significant airflow disturbance in advance, which is convenient for being fully mixed with the fuel gas.

[0081] Specifically, the bending angle θ may be 90°.

[0082] It should be noted that the bending angle between the first portion 12a and the second portion 12b can be understood as: the bending angle of the first portion 12a relative to the second portion 12b, that is, the angle θ of the axis of the outlet end of the first portion 12a relative to the axis of the outlet end of the second portion 12b rotated counterclockwise. Figure 1 .

[0083] In some embodiments, please refer to Figure 3 The present application provides a gas combustion device, which includes: a burner 200 and an air duct structure 100 as described above, and the burner 200 is connected to the air bin 11.

[0084] The above-mentioned gas combustion equipment adopts the above air duct structure 100, sets a swirler 40 in the air inlet part 12, and locates it at the downstream end of the gas part 13, so that the incoming gas and the combustion-supporting gas are mixed under the action of the swirler 40; the mixed gas after mixing enters the air chamber 11 for re-mixing, so that the gas and the combustion-supporting gas are fully mixed. Since the ratio of the distance between the axis of the swirler 40 and the axis of the gas part 13 to the inner diameter of the gas part 13 is controlled to be 3-5, therefore, in the structural design, the space between the swirler 40 and the gas part 13 changes in positive correlation with the inner diameter of the gas part 13. Designed in this way, it can ensure that the space between the swirler 40 and the gas part 13 can meet the stable flow of the gas in the gas parts 13 of different sizes, so that the gas and the combustion-supporting gas are premixed at the upstream end of the swirler 40, avoiding the insufficient space at the upstream end of the swirler 40 resulting in the gas accelerating through the swirler 40, so that the gas and the combustion-supporting gas are fully mixed under the action of the swirler 40, effectively enhancing the mixing degree of the gas and the combustion-supporting gas, realizing stable and efficient combustion, and improving the thermal efficiency.

[0085] In some embodiments, please refer to Figure 3 , a gas heating system, which includes the above-mentioned gas combustion equipment.

[0086] The above-mentioned gas heating system adopts the above air duct structure 100, sets a swirler 40 in the air inlet part 12, and locates it at the downstream end of the gas part 13, so that the incoming gas and the combustion-supporting gas are mixed under the action of the swirler 40; the mixed gas after mixing enters the air chamber 11 for re-mixing, so that the gas and the combustion-supporting gas are fully mixed. Since the ratio of the distance between the axis of the swirler 40 and the axis of the gas part 13 to the inner diameter of the gas part 13 is controlled to be 3-5, therefore, in the structural design, the space between the swirler 40 and the gas part 13 changes in positive correlation with the inner diameter of the gas part 13. Designed in this way, it can ensure that the space between the swirler 40 and the gas part 13 can meet the stable flow of the gas in the gas parts 13 of different sizes, so that the gas and the combustion-supporting gas are premixed at the upstream end of the swirler 40, avoiding the insufficient space at the upstream end of the swirler 40 resulting in the gas accelerating through the swirler 40, so that the gas and the combustion-supporting gas are fully mixed under the action of the swirler 40, effectively enhancing the mixing degree of the gas and the combustion-supporting gas, realizing stable and efficient combustion, and improving the thermal efficiency.

[0087] It should be noted that the gas heating system of this embodiment can be but is not limited to gas water heaters, wall-hung boilers, etc.

[0088] Furthermore, the combustion heating system further includes a housing, a water jacket 300, a controller 400, a gas valve 20, and a power plug 500. The air duct structure 100, the burner 200, the water jacket 300, the controller 400, and the gas valve 20 are all disposed inside the housing. The water jacket 300 is disposed above the burner 200 and is used to absorb the waste heat of the flue gas and at the same time maintain the low temperature of the body surface. The gas valve 20 is used to control the gas to be introduced into the air duct structure 100 and is electrically connected to the controller 400.

[0089] 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.

[0090] The above-described embodiments only represent several implementation manners of the present application. The description 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 should be subject to the appended claims.

Claims

1. An air duct structure, characterized in that, The air duct structure includes: A mixed gas (10), including an air inlet part (12) and an air chamber (11) communicated with the air inlet part (12). A gas component (13) is communicated with the air inlet part (12). The air chamber (11) is used to be communicated with a burner (200); A swirler (40) is arranged on the inner wall of the air inlet part (12) and is located at the downstream end of the gas component (13) along the air flow direction in the air inlet part (12). The swirler (40) is used to mix gas with combustion-supporting gas; The inner diameter of the gas component (13) is denoted as D, and the distance between the end of the swirler (40) facing away from the air chamber (11) and the axis of the gas component (13) is denoted as L1. Wherein, 3 ≤ L1 / D ≤ 5.

2. The air duct structure according to claim 1, wherein The condition satisfied by the inner diameter D of the gas component (13) is: 6mm ≤ D ≤ 16mm.

3. The air duct structure according to claim 2, characterized in that, The inner diameter D of the gas component (13) also satisfies the condition: 8mm ≤ D ≤ 12mm.

4. The air duct structure according to any one of claims 1 to 3, characterized in that The condition satisfied by the distance L1 is: 27mm ≤ L1 ≤ 45mm.

5. The air duct structure according to any one of claims 1 to 3, characterized in that, The distance between the end of the swirler (40) facing the air chamber (11) and the end of the swirler (40) facing away from the air chamber (11) is denoted as L2. Wherein, 1 ≤ L2 / D ≤ 2.

6. The air duct structure according to claim 5, characterized in that, The condition satisfied by the distance L2 is: 9mm ≤ L2 ≤ 18mm.

7. The air duct structure according to any one of claims 1-3, characterized in that, The distance between the end of the swirler (40) facing the air chamber (11) and the end of the air inlet part (12) close to the air chamber (11) is denoted as L3. Wherein, 2 ≤ L3 / D ≤ 4.

8. The air duct structure according to claim 7, characterized in that The condition satisfied by the distance L3 is: 18mm ≤ L3 ≤ 36mm.

9. The air duct structure according to any one of claims 1 to 3, characterized in that, The swirler (40) includes blades (41). A groove (124) is arranged on the inner wall of the air inlet part (12). The blades (41) are arranged on the groove wall of the groove (124).

10. The air duct structure according to claim 9, characterized in that, A first positioning part (42) and a second positioning part (43) are arranged on the inner wall of the air inlet part (12) at intervals along the air flow direction. The first positioning part (42) is arranged farther away from the air chamber (11) than the second positioning part (43). The first positioning part (42), the second positioning part (43) and the inner wall of the air inlet part (12) enclose to form the groove (124). The blades (41) are arranged between the first positioning part (42) and the second positioning part (43). And the distance between one side surface of the first positioning part (42) facing the blades and the axis of the gas component (13) is the distance L1.

11. The air duct structure according to any one of claims 1-3, characterized in that, A blocking part (111) is arranged on the inner wall of the air chamber (11). The blocking part (111) is used to block at least part of the mixed gas flowing out of the air inlet part (12).

12. The air duct structure according to any one of claims 1 to 3, characterized in that, The intake member (12) includes a blower section (122), a diffuser section (123), and a gas mixing section (121) that are connected in sequence. The gas mixing section (121) is in communication with the air chamber (11). The swirler (40) is provided on the inner wall of the gas mixing section (121). The cross-sectional area of the diffuser section (123) gradually increases from one end of the diffuser section (123) close to the blower section (122) to the other end of the diffuser section (123) close to the gas mixing section (121).

13. A gas combustion device, characterized in that, The gas combustion device includes: a burner (200); the air duct structure according to any one of claims 1-12, wherein the burner (200) is in communication with the air chamber (11).

14. A combustion heating system, characterized in that, The gas heating system includes the gas combustion device according to claim 13.

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