Combustion devices and gas-fired hot water equipment

Abstract

This invention relates to a combustion device and a gas-fired hot water equipment. A circulation pipe is installed between the mixing chamber and the exhaust structure, allowing some of the flue gas from the exhaust structure to be guided into the mixing chamber and then into the gas supply channel to mix with the gas. After mixing, the gas is then uniformly transported to the burner for combustion via the gas supply channel. Because the mixing chamber restricts the entry of primary air, the flue gas can completely replace the primary air during mixing, preventing the gas from mixing with primary air again before entering the gasifier. Furthermore, the oxygen concentration in the flue gas is much lower than that in the air, approximately 1 / 3 to 1 / 2. Therefore, during the gas mixing process, the mixture effectively avoids reaching combustible concentration conditions, effectively improving the combustion characteristics of the mixture, reducing the risk of combustion explosion, and ensuring stable combustion.

Description

Technical Field

[0001] This invention relates to the field of gas combustion technology, and in particular to combustion devices and gas-fired hot water equipment. Background Technology

[0002] When gas appliances use gas with a high combustion rate, the combustion potential of the gas is relatively large. When using atmospheric combustion, after the gas mixes with primary air, the gas concentration in the mixture is already within the combustible range. This can easily lead to deflagration in the burner and combustion chamber, affecting the use of the gas appliance and even causing safety accidents, thus impacting the utilization of this type of gas. Summary of the Invention

[0003] The first technical problem solved by this invention is to provide a combustion device that can effectively improve the combustion characteristics of the gas mixture, reduce the risk of combustion explosion, and ensure stable combustion.

[0004] The second technical problem solved by the present invention is to provide a gas-fired hot water device that can effectively improve the combustion characteristics of the gas mixture, reduce the risk of combustion explosion, and ensure stable combustion.

[0005] The first technical problem mentioned above is solved by the following technical solution:

[0006] A combustion device includes: a combustion chamber; a smoke exhaust structure for partially exhausting the smoke generated in the combustion chamber outside the combustion device; a burner with its combustion end located in the combustion chamber; and a gas supply assembly including a mixing component, an air inlet pipe, and a circulation pipe. The mixing component has a mixing chamber and a gas supply passage communicating with the mixing chamber. The air inlet pipe is connected to the gas supply passage. One end of the circulation pipe is connected to the smoke exhaust structure, and the other end is connected to the mixing chamber. The mixing chamber is used to restrict the entry of primary air. The gas supply passage is connected to the air inlet end of the burner.

[0007] The combustion device of this invention offers the following advantages compared to the prior art: A circulation pipe is installed between the mixing chamber and the exhaust structure, allowing some of the flue gas from the exhaust structure to be guided into the mixing chamber and mixed with the combustion gas in the gas supply channel. After mixing, the gas is then uniformly transported to the burner for combustion via the gas supply channel. Because the mixing chamber restricts the entry of primary air, the flue gas completely replaces the primary air during mixing, preventing the combustion gas from mixing with primary air before entering the burner. Furthermore, the oxygen concentration in the flue gas is much lower than that in the air, approximately 1 / 3 to 1 / 2. Therefore, during the combustion gas mixing process, the formation of a combustible gas mixture is effectively avoided, significantly improving the combustion characteristics of the mixture, reducing the risk of combustion explosion, and ensuring stable combustion.

[0008] In one embodiment, the combustion device further includes a fan for powering the flow of flue gas within the combustion device and is not connected to the mixing chamber.

[0009] In one embodiment, the working end of the fan is connected to the combustion chamber or the exhaust structure.

[0010] In one embodiment, the exhaust structure includes an exhaust pipe and a manifold connected to the exhaust pipe, wherein the angle α between the axis of the manifold and the direction of flue gas flow in the exhaust pipe is an acute angle, the exhaust pipe is connected to the combustion chamber, and the circulation pipe is connected to the manifold.

[0011] In one embodiment, the angle α between the axis of the manifold and the direction of flue gas flow in the exhaust pipe is 30° to 75°.

[0012] In one embodiment, the exhaust structure further includes a smoke collection hood, the combustion chamber has an opening, the smoke collection hood covers the opening, and the exhaust pipe is connected to the smoke collection hood.

[0013] In one embodiment, at least one section of the circulation pipe is in contact with the combustion chamber.

[0014] In one embodiment, at least one section of the circulation pipe along its length is a heating section, which is attached to the combustion chamber and extends along the height of the combustion chamber.

[0015] In one embodiment, the combustion device further includes a control valve disposed on the circulation pipe and used to control the on / off flow of flue gas in the circulation pipe and / or adjust the amount of flue gas circulating.

[0016] In one embodiment, the combustion device further includes a discharge pipe connected to the circulation pipe to guide condensate in the circulation pipe out.

[0017] In one embodiment, the combustion device further includes a nozzle mounted on the intake pipe and located between the mixing chamber and the supply air passage or within the supply air passage.

[0018] In one embodiment, the cross-sectional area S1 of the air supply passage increases from one end of the air supply passage near the mixing chamber to the other end of the air supply passage near the burner.

[0019] In one embodiment, the cross-sectional area S2 of the mixing chamber decreases from one end of the mixing chamber away from the supply air passage to the end of the mixing chamber near the supply air passage, so that an ejector region is formed between the mixing chamber and the supply air passage, and one end of the air inlet pipe extends into the ejector region.

[0020] The second technical problem mentioned above is solved by the following technical solution:

[0021] A gas-fired water heater includes a heat exchanger and a combustion device as described in any one of the above, wherein the heat exchanger is connected to the combustion chamber, and the exhaust structure is shrouded on the end of the heat exchanger facing away from the combustion chamber.

[0022] The gas-fired water heater of this invention offers the following advantages compared to the prior art: Using the above-described combustion device, a circulation pipe is installed between the mixing chamber and the exhaust structure, allowing some of the flue gas from the exhaust structure to be guided into the mixing chamber and mixed with the gas supply channel. After mixing, the gas is then uniformly transported to the burner for combustion via the supply channel. Because the mixing chamber restricts the entry of primary air, the flue gas completely replaces the primary air during mixing, preventing the gas from mixing with primary air before entering the gasifier. Furthermore, the oxygen concentration in the flue gas is much lower than that in the air, approximately 1 / 3 to 1 / 2. Therefore, during the gas mixing process, the mixture effectively avoids reaching combustible concentration conditions, effectively improving the combustion characteristics of the mixture, reducing the risk of combustion explosion, and ensuring stable combustion. Attached Figure Description

[0023] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of a gas-fired water heater as described in one embodiment;

[0026] Figure 2 This is a schematic diagram of a gas-fired hot water device with a control valve as described in one embodiment;

[0027] Figure 3 This is a schematic diagram of the forced-extraction gas-fired water heater structure described in one embodiment;

[0028] Figure 4 This is a schematic diagram of a gas-fired water heater as a balancing machine in one embodiment.

[0029] Figure label:

[0030] 100. Combustion device; 110. Combustion chamber; 111. Opening; 120. Exhaust structure; 121. Exhaust pipe; 122. Manifold; 123. Smoke hood; 130. Gas supply assembly; 131. Mixing component; 1311. Mixing chamber; 1312. Gas supply channel; 1313. Injector area; 132. Inlet pipe; 133. Circulation pipe; 1331. Heating section; 1332. First buffer section; 1333. Second buffer section; 134. Control valve; 135. Discharge pipe; 136. Nozzle; 140. Burner; 141. Injector; 150. Fan; 151. Volute; 200. Heat exchanger; 210. Water inlet pipe; 220. Water outlet pipe; 300. Shell; 310. Channel. Detailed Implementation

[0031] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0032] In one embodiment, please refer to Figure 1 A combustion device 100 includes a combustion chamber 110, a flue gas exhaust structure 120, a burner 140, and an air supply assembly 130. The flue gas exhaust structure 120 is used to discharge part of the flue gas generated in the combustion chamber 110 outside the combustion device 100. The combustion end of the burner 140 is located inside the combustion chamber 110. The air supply assembly 130 includes a mixing component 131, an air inlet pipe 132, and a circulation pipe 133. The mixing component 131 has a mixing chamber 1311 and an air supply passage 1312 communicating with the mixing chamber 1311. The air inlet pipe 132 communicates with the mixing chamber 1311. One end of the circulation pipe 133 communicates with the flue gas exhaust structure 120, and the other end communicates with the mixing chamber 1311. The mixing chamber 1311 is used to restrict the entry of primary air, and the air supply passage 1312 communicates with the air inlet end of the burner 140.

[0033] The aforementioned combustion device 100 includes a circulation pipe 133 between the mixing chamber 1311 and the exhaust structure 120. This allows some of the flue gas from the exhaust structure 120 to be guided into the mixing chamber 1311 and then into the gas supply channel 1312 to mix with the combustion gas. After mixing, the gas is then uniformly transported to the burner 140 via the gas supply channel 1312 for combustion. Because the mixing chamber 1311 restricts the entry of primary air, the flue gas can completely replace the primary air during mixing, preventing the combustion gas from mixing with primary air before entering the burner. Furthermore, the oxygen concentration in the flue gas is much lower than that in the air, approximately 1 / 3 to 1 / 2. Therefore, during the combustion gas mixing process, the mixture effectively avoids reaching a combustible concentration, which would significantly reduce the combustion rate of the mixture. The combustion potential decreases by 35% to 50%, effectively improving the combustion characteristics of the mixture, reducing the risk of combustion explosion, and ensuring stable combustion. In addition, the flue gas recirculation method can effectively reduce the flame temperature during the combustion process, which helps to suppress the generation of nitrogen oxides, improve the control of pollutants in the exhaust gas, and improve the environmental protection indicators of the combustion device 100 accordingly.

[0034] It should be noted that the restriction on primary air entry within the mixing chamber 1311 should be understood as follows: due to its structural design, the mixing chamber 1311 only allows flue gas to enter. Primary air cannot enter the mixing chamber 1311 through ejection or the blowing action of the fan 150. For example, the structure of the mixing chamber 1311 is sealed except for its connection with the supply air passage 1312, circulation pipe 133, and intake pipe 132; simultaneously, the connections between the mixing chamber 1311 and the intake pipe 132 and circulation pipe 133 are also sealed. Furthermore, if the combustion device 100 contains equipment such as the fan 150, the outlet of the fan 150 is not connected to the mixing chamber 1311, meaning that no air can be blown into the mixing chamber 1311. Here, "primary air" refers to the air premixed with the combustion gas before entering the burner 140.

[0035] It should also be noted that the combustion device 100 of this application can be used in different devices, such as gas water heaters or gas stoves. As long as the device involves gas combustion, the combustion device 100 of this application can be used. Not all of them will be listed here.

[0036] Further, please refer to Figure 1The combustion device 100 also includes a fan 150. The fan 150 provides power for the flow of flue gas within the combustion device 100 and is not connected to the mixing chamber 1311; that is, the fan 150 is not designed to be connected to the mixing chamber 131. By limiting the connection between the fan 150 and the mixing chamber 1311, the airflow generated by the fan 150 can be effectively prevented from entering the mixing chamber 1311 and causing a further increase in the oxygen concentration of the mixture.

[0037] It should be noted that the fan 150 provides power for flue gas flow in at least two ways, such as forced draft and forced blow. Please refer to [reference needed]. Figure 3 When fan 150 is a forced draft type, fan 150 provides suction force for the flow of flue gas; please refer to... Figure 1 When the blower 150 is a forced-draft type, the blower 150 provides the blowing force for the flue gas flow.

[0038] Furthermore, please refer to Figure 1 and Figure 3 The working end of the blower 150 is connected to the combustion chamber 110 or the exhaust structure 120, enabling the blower 150 to drive the flue gas to flow stably using either a strong blowing or strong suction method. The working end can be either an outlet or an inlet. For example, when the working end of the blower 150 is connected to the combustion chamber 110, it is the outlet, providing blowing force for the flue gas flow; when the working end of the blower 150 is connected to the exhaust structure 120, it is the inlet, providing suction force for the flue gas flow.

[0039] Additionally, please refer to Figure 3 When the fan 150 is connected to the smoke exhaust structure 120, a volute 151 structure can be installed between the fan 150 and the smoke exhaust structure 120 to reduce the resistance to the flow of flue gas and ensure smooth smoke exhaust.

[0040] Alternatively, the fan 150 can be installed on the combustion chamber 110 or the exhaust structure 120 by welding, snap-fitting, bolting, pinning, riveting, etc.

[0041] In one embodiment, please refer to Figure 1 The exhaust structure 120 includes an exhaust pipe 121 and a manifold 122 connected to the exhaust pipe 121. The exhaust pipe 121 is connected to the combustion chamber 110. The recirculation pipe 133 is connected to the manifold 122. The angle α between the axis of the manifold 122 and the direction of flue gas flow in the exhaust pipe 121 is an acute angle, that is, the inclined extension direction of the manifold 122 on the exhaust pipe 121 is in the same direction as the direction of flue gas flow in the exhaust pipe 121. This allows the portion of the flue gas exiting from the exhaust pipe 121 to obtain initial dynamic pressure, which is beneficial to the stability of the flue gas flow after exiting and effectively improves the regulation characteristics of the recirculated flue gas flow. To facilitate understanding of the axis of the manifold 122 and the direction of flue gas flow in the exhaust pipe 121, Figure 1 For example, the axis of manifold 122 is Figure 1 The line represented by T1; the direction of flue gas flow in the exhaust pipe 121 is Figure 1 The direction indicated by T2.

[0042] It should be noted that the connection between the exhaust pipe 121 and the combustion chamber 110 can be direct or indirect. Indirect connection should be understood as: there is an intermediate structure between the exhaust pipe 121 and the combustion chamber 110, through which flue gas can flow between the combustion chamber 110 and the exhaust pipe 121.

[0043] Further, please refer to Figure 1 The angle α between the axis of manifold 122 and the direction of flue gas flow in exhaust pipe 121 is 30° to 75°. By properly controlling the angle between manifold 122 and exhaust pipe 121, the flow of exhaust gas becomes more stable.

[0044] In one embodiment, please refer to Figure 1 The exhaust structure 120 also includes a smoke collection hood 123. An opening 111 is provided on the combustion chamber 110. The smoke collection hood 123 covers the opening 111, and the exhaust pipe 121 is connected to the smoke collection hood 123. Thus, the smoke exhaust from the combustion chamber 110 is effectively collected by the smoke collection hood 123, facilitating a unified flow of smoke into the exhaust pipe 121 for discharge, ensuring smooth exhaust.

[0045] It should be noted that the smoke hood 123 can be directly and sealed to the combustion chamber 110; or it can maintain a distance from the combustion chamber 110 at one end, as long as the smoke hood 123 is covered above the opening 111.

[0046] Additionally, please refer to Figure 3 When the fan 150 is installed on the smoke exhaust structure 120, the fan 150 can be connected to the smoke collection hood 123 through the volute 151 to achieve stable forced smoke exhaust.

[0047] In one embodiment, please refer to Figure 1 At least one section of the circulation pipe 133 is in contact with the combustion chamber 110. In this way, the heat released from the surface of the combustion chamber 110 is used to heat the flue gas in the circulation pipe 133, so as to avoid the condensation and precipitation of water vapor in the flue gas, which would affect the flow of the flue gas.

[0048] It should be noted that the circulation pipe 133 can contact the combustion chamber 110 by having at least one section of the circulation pipe 133 pressed tightly against the combustion chamber 110; or, at least one section of the circulation pipe 133 can be wrapped around the periphery of the combustion chamber 110, etc.

[0049] Further, please refer to Figure 1At least one section of the circulation pipe 133 along its length is a heating section 1331. The heating section 1331 is attached to the combustion chamber 110 and extends along the height of the combustion chamber 110. This allows the flue gas in the heating section 1331 to fully exchange heat with the combustion chamber 110, further preventing water vapor condensation in the flue gas and thus avoiding its flow. For ease of understanding the height direction of the combustion chamber 110, [the following is used as an example]. Figure 1 For example, the height direction of combustion chamber 110 is... Figure 1 The direction pointed to by any arrow in T3.

[0050] In one embodiment, please refer to Figure 2 The combustion device 100 also includes a control valve 134. The control valve 134 is located on the circulation pipe 133 and is used to control the flow of flue gas within the circulation pipe 133 and / or adjust the flue gas circulation volume. Therefore, when combustion is required, the control valve 134 is opened to allow a certain flow of flue gas into the circulation pipe 133. If the mixing ratio between the fuel gas and flue gas in the mixture does not meet the preset conditions, the flue gas circulation volume in the circulation pipe 133 can be adjusted through the control valve 134 to ensure the safety of fuel gas combustion; it also helps to improve the operating characteristics of the combustion device 100. When combustion ends, closing the control valve 134 cuts off the flow of flue gas in the circulation pipe 133.

[0051] Optionally, the control valve 134 may be, but is not limited to, a gate valve, a ball valve, a proportional valve, a butterfly valve, etc.

[0052] In one embodiment, please refer to Figure 1 The combustion device 100 also includes a discharge pipe 135. The discharge pipe 135 is connected to the circulation pipe 133 to guide and discharge condensate in the circulation pipe 133. In this way, the discharge pipe 135 can effectively remove condensate that may condense and accumulate in the flue gas circulation pipe 133, so as to maintain stable flue gas flow in the circulation pipe 133.

[0053] Further, please refer to Figure 1At least one section of the circulation pipe 133 is a first buffer section 1332. The first buffer section 1332 is located closer to the exhaust pipe 121 than the heating section 1331 and is inclined relative to the extension direction of the heating section 1331. The exhaust pipe 135 is connected to the first buffer section 1332. Therefore, designing the first buffer section 1332 upstream of the heating section 1331 ensures that when flue gas flows in the circulation pipe 133, it first passes through the first buffer section 1332 before flowing into the heating section 1331. Because the first buffer section 1332 is inclined relative to the extension direction of the heating section 1331, it has a certain slope, which helps to reduce the flue gas velocity within the first buffer section 1332. This slows down any condensation of water vapor within the first buffer section 1332, facilitating the unified discharge of the condensed water vapor from the exhaust pipe 135.

[0054] For details, please refer to Figure 1 The end of the first buffer section 1332 near the heating section 1331 is lower than the end of the first buffer section 1332 away from the heating section 1331, and is relatively close to the combustion chamber 110.

[0055] In one embodiment, please refer to Figure 1 At least one section of the circulation pipe 133 is a second buffer section 1333. The second buffer section 1333 is distributed closer to the mixing component 131 than the heating section 1331, and is inclined relative to the extension direction of the heating section 1331. That is, a pipe with a certain slope is also provided at the downstream end of the heating section 1331, which provides a certain resistance to the flow of flue gas in the heating section 1331, which can slow down the flow of flue gas in the heating section 1331 to a certain extent, prolong the contact time between the flue gas and the combustion chamber 110, and effectively reduce the condensation and precipitation of water vapor in the flue gas.

[0056] For details, please refer to Figure 1 The end of the second buffer section 1333 near the heating section 1331 is higher than the end of the second buffer section 1333 away from the heating section 1331, and is relatively close to the combustion chamber 110.

[0057] In one embodiment, please refer to Figure 1 The combustion device 100 also includes a nozzle 136. The nozzle 136 is mounted on the intake pipe 132 and is located between the mixing chamber 1311 and the supply gas passage 1312 or within the supply gas passage 1312. In this way, the nozzle 136 allows the combustion gas to be delivered to the mixing chamber 1311 more effectively, so as to ensure stable combustion.

[0058] In one embodiment, please refer to Figure 3When the burner 140 is equipped with an ejector 141 at its air inlet, the gas supply channel 1312 is connected to the ejector 141 to ensure stable gas supply. Of course, an adapter can be installed between the gas supply channel 1312 and the ejector 141 to achieve a stable connection between the two.

[0059] In one embodiment, please refer to Figure 1 The cross-sectional area S1 of the gas supply passage 1312 increases from one end of the gas supply passage 1312 near the mixing chamber 1311 to the other end of the gas supply passage 1312 near the burner 140. This "increase" can include a gradual increase, or an initial increase followed by a period of inactivity followed by another increase. This design gives the gas supply passage 1312 an expanded structural design, reducing the flow velocity of the mixture within the gas supply passage 1312 and ensuring stable air intake in the burner 140, thereby improving combustion characteristics.

[0060] In one embodiment, please refer to Figure 1 The cross-sectional area S2 of the mixing chamber 1311 decreases from the end of the mixing chamber 1311 away from the gas supply channel 1312 to the end of the mixing chamber 1311 closer to the gas supply channel 1312, so that an ejector region 1313 is formed between the mixing chamber 1311 and the gas supply channel 1312, and one end of the intake pipe 132 extends into the ejector region 1313. That is, the closer the mixing chamber 1311 is to the gas supply channel 1312, the smaller its cross-sectional area S2 is. This can accelerate the flow velocity of the mixed gas into the gas supply channel 1312, so that the combustion gas can form an ejector force in the ejector region 1313, attracting the flue gas in the mixing chamber 1311 to flow towards the gas supply channel 1212, so that it mixes with the combustion gas, thereby helping to ensure stable combustion.

[0061] For details, please refer to Figure 1 The cross-sectional area S2 of the mixing chamber 1311 decreases from the end of the mixing chamber 1311 away from the supply air passage 1312 to the end of the mixing chamber 1311 near the supply air passage 1312; the cross-sectional area S1 of the supply air passage 1312 increases from the end of the supply air passage 1312 near the mixing chamber 1311 to the end of the supply air passage 1312 near the burner 140, so that an ejector region 1313 with the smallest cross-sectional area is formed between the mixing chamber 1311 and the supply air passage 1312. At this time, the nozzle 136 on the intake pipe 132 is located within the ejector region 1313.

[0062] In one embodiment, please refer to Figure 1 A gas-fired water heater includes a heat exchanger 200 and a combustion device 100 in any of the above embodiments. The heat exchanger 200 is connected to a combustion chamber 110. An exhaust structure 120 is mounted on the end of the heat exchanger 200 facing away from the combustion chamber 110.

[0063] The aforementioned gas-fired water heater uses the combustion device 100 described above. A circulation pipe 133 is installed between the mixing chamber 1311 and the exhaust structure 120, allowing some of the flue gas in the exhaust structure 120 to be guided into the mixing chamber 1311 and then into the gas supply channel 1312 to mix with the gas. After mixing, the gas is then uniformly transported to the burner 140 for combustion via the gas supply channel 1312. Because the mixing chamber 1311 restricts the entry of primary air, the flue gas can completely replace the primary air during mixing, preventing the gas from mixing with primary air before entering the gasifier. In addition, the oxygen concentration in the flue gas is much lower than that in the air, approximately 1 / 3 to 1 / 2. Therefore, during the gas mixing process, the mixture effectively avoids reaching the flammable concentration condition, effectively improving the combustion characteristics of the mixture, reducing the risk of combustion explosion, and ensuring stable combustion.

[0064] It should be noted that the gas-fired water heater also includes at least a casing 300 and an inlet pipe 210 and an outlet pipe 220 respectively connected to the heat exchanger 200. Both the combustion chamber 110 and the heat exchanger 200 are located within the casing 300. Please refer to [reference needed]. Figure 4 When the gas-fired water heater is a balancing machine, the housing 300 has a channel 310. The flue pipe 121 extends into the channel 310, and there is a gap between the outer wall of the flue pipe 121 and the inner wall of the channel 310.

[0065] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0066] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0067] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0068] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0069] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0070] The technical features of the above embodiments can be combined in any way. For the sake of brevity, 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, they should be considered to be within the scope of this specification.

[0071] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A combustion device, characterized in that, The combustion device (100) includes: Combustion chamber (110); Smoke exhaust structure (120) is used to exhaust part of the smoke generated in the combustion chamber (110) outside the combustion device (100); A burner (140), the combustion end of which is located within the combustion chamber (110); An air supply assembly (130) includes a mixing component (131), an air inlet pipe (132), and a circulation pipe (133). The mixing component (131) has a mixing chamber (1311) and an air supply passage (1312) connected to the mixing chamber (1311). The air inlet pipe (132) is connected to the air supply passage (1312). One end of the circulation pipe (133) is connected to the exhaust structure (120), and the other end is connected to the mixing chamber (1311). Both the mixing chamber (1311) and the air supply passage (1312) are used to restrict the entry of primary air. The air supply passage (1312) is connected to the air inlet end of the burner (140). At least one section of the circulation pipe (133) is in contact with the combustion chamber (110).

2. The combustion device according to claim 1, characterized in that, The combustion device (100) further includes a fan (150) for providing power for the flow of flue gas in the combustion device (100) and is not connected to the mixing chamber (1311).

3. The combustion device according to claim 2, characterized in that, The working end of the fan (150) is connected to the combustion chamber (110) or the exhaust structure (120).

4. The combustion device according to claim 1, characterized in that, The exhaust structure (120) includes an exhaust pipe (121) and a manifold (122) connected to the exhaust pipe (121). The angle α between the axis of the manifold (122) and the direction of flue gas flow in the exhaust pipe (121) is an acute angle. The exhaust pipe (121) is connected to the combustion chamber (110), and the circulation pipe (133) is connected to the manifold (122).

5. The combustion device according to claim 4, characterized in that, The angle α between the axis of the manifold (122) and the direction of flue gas flow in the exhaust pipe (121) is 30° to 75°.

6. The combustion device according to claim 4, characterized in that, The exhaust structure (120) also includes a smoke hood (123), the combustion chamber (110) is provided with an opening (111), the smoke hood (123) is placed above the opening (111), and the exhaust pipe (121) is connected to the smoke hood (123).

7. The combustion device according to claim 1, characterized in that, The circulation pipe (133) has at least one section along its length that is a heating section (1331), the heating section (1331) is attached to the combustion chamber (110) and extends along the height of the combustion chamber (110).

8. The combustion device according to any one of claims 1-7, characterized in that, The combustion device (100) further includes a control valve (134), which is located on the circulation pipe (133) and is used to control the flow of flue gas in the circulation pipe (133) and / or adjust the amount of flue gas circulation.

9. The combustion device according to any one of claims 1-7, characterized in that, The combustion device (100) further includes a discharge pipe (135) connected to the circulation pipe (133) to guide condensate in the circulation pipe (133) out; and / or, The combustion device (100) further includes a nozzle (136), which is mounted on the air intake pipe (132) and located between the mixing chamber (1311) and the air supply channel (1312) or within the air supply channel (1312).

10. The combustion device according to any one of claims 1-7, characterized in that, The cross-sectional area S1 of the air supply channel (1312) increases from one end of the air supply channel (1312) near the mixing chamber (1311) to the other end of the air supply channel (1312) near the burner (140).

11. The combustion device according to claim 10, characterized in that, The cross-sectional area S2 of the mixing chamber (1311) decreases from one end of the mixing chamber (1311) away from the supply air channel (1312) to the other end of the mixing chamber (1311) near the supply air channel (1312), so that an ejector region (1313) is formed between the mixing chamber (1311) and the supply air channel (1312), and one end of the air inlet pipe (132) extends into the ejector region (1313).

12. A gas-fired hot water device, characterized in that, The gas-fired hot water equipment includes a heat exchanger (200) and a combustion device (100) as described in any one of claims 1-11. The heat exchanger (200) is connected to the combustion chamber (110), and the exhaust structure (120) is shrouded on the end of the heat exchanger (200) facing away from the combustion chamber (110).

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