Combustion device and gas hot water equipment

Abstract

The invention relates to a combustion device and gas water heating equipment.A circulating pipe is arranged between a mixing cavity and a smoke discharging structure, so that part of smoke in the smoke discharging structure is guided into the mixing cavity and enters a gas supply flow channel to be mixed with gas; after mixing, the mixture is uniformly conveyed into a burner through an air supply flow channel for combustion. Since the mixing chamber can restrict the primary air from entering, the flue gas can completely replace the primary air during mixing, so that the fuel gas is no longer mixed with the primary air before entering the burner. In addition, the oxygen concentration in the flue gas is far lower than that in the air and is about 1/3-1/2 of that in the air, so that the condition that the mixed gas reaches the combustible concentration is effectively avoided in the gas mixing process, the combustion characteristic of the mixed gas is effectively improved, the occurrence of the explosion risk is reduced, and the combustion stability is ensured.

Description

technical field

The invention relates to the technical field of gas combustion, in particular to a combustion device and gas hot water equipment.

Background technique

When a gas appliance uses a gas with a higher combustion speed, the combustion potential of the gas is greater. When the atmospheric combustion method is adopted, after the gas is mixed with the primary air, the gas concentration of the mixture is already in the combustible range, and the burner and the combustion chamber are prone to deflagration, which affects the use of gas appliances and even leads to safety accidents. Affected the utilization of this kind of gas.

Contents of the invention

The first technical problem to be solved by the present invention is to provide a combustion device, which can effectively improve the combustion characteristics of the mixture, reduce the risk of explosion, and ensure stable combustion.

The second technical problem to be solved by the present invention is to provide a gas water heating device, which can effectively improve the combustion characteristics of the mixture, reduce the risk of explosion, and ensure stable combustion.

Above-mentioned first technical problem is solved by following technical scheme:

A combustion device, the combustion device comprising: a combustion chamber; a smoke exhaust structure, the smoke exhaust structure is used to discharge part of the smoke generated in the combustion chamber to the outside of the combustion device; a burner, the burner The combustion end is located in the combustion chamber; the air supply assembly, the air supply assembly includes a mixing piece, an air intake pipe and a circulation pipe, the mixing piece is provided with a mixing chamber and a supply flow channel connected to the mixing chamber, the The air intake pipe communicates with the air supply channel, one end of the circulation pipe communicates with the smoke exhaust structure, and the other end communicates with the mixing chamber, the mixing chamber is used to limit the entry of primary air, and the air supply channel communicates with the The intake end of the burner is connected.

Compared with the background technology, the combustion device of the present invention has beneficial effects: a circulation pipe is arranged between the mixing chamber and the smoke exhaust structure, so that part of the smoke in the smoke exhaust structure is guided into the mixing chamber and enters the air supply flow It is mixed with gas in the channel; after mixing, it is uniformly transported to the burner through the air supply channel for combustion. Since the primary air can be restricted from entering the mixing chamber, the flue gas can completely replace the primary air during mixing, so that the gas is no longer mixed with the primary air before entering the gas burner. In addition, the oxygen concentration in the flue gas is much lower than the oxygen concentration in the air, which is about 1/3~1/2 of that in the air. Therefore, in the process of gas mixing, the condition that the mixed gas reaches a flammable concentration can be effectively avoided, and the condition can be effectively improved. The combustion characteristics of the mixed gas reduce the risk of explosion and ensure stable combustion.

In one of the embodiments, the combustion device further includes a fan, which is used to provide power for the flue gas to flow in the combustion device, and is not communicated with the mixing chamber.

In one of the embodiments, the working end of the blower is connected to the combustion chamber or the smoke exhaust structure.

In one of the embodiments, the smoke exhaust structure includes a smoke exhaust pipe and a manifold connected to the smoke exhaust pipe, the axis between the manifold and the flow direction of the smoke in the smoke exhaust pipe The angle α is an acute angle, the exhaust pipe communicates with the combustion chamber, and the circulation pipe communicates with the manifold.

In one of the embodiments, the angle α between the axis of the manifold and the flow direction of the smoke in the smoke exhaust pipe is 30°-75°.

In one of the embodiments, the smoke exhaust structure further includes a smoke collection hood, an opening is provided on the combustion chamber, and the smoke collection hood is arranged above the opening, and the smoke exhaust pipe and the collection The hood is connected.

In one of the embodiments, at least one section of the circulation pipe is in contact with the combustion chamber.

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

In one of the embodiments, the combustion device further includes a control valve, the control valve is arranged on the circulation pipe, and is used to control the on-off of the flue gas flow in the circulation pipe and/or the adjustment of the flue gas circulation amount .

In one of the embodiments, the combustion device further includes a discharge pipe, and the discharge pipe communicates with the circulation pipe to guide and discharge the condensed water in the circulation pipe.

In one of the embodiments, the combustion device further includes a nozzle, and the nozzle is installed on the intake pipe and is located between the mixing chamber and the air supply channel or in the air supply channel.

In one of the embodiments, the cross-sectional area S1 of the air supply channel increases from an end of the air supply channel close to the mixing chamber to an end of the air supply channel close to the burner.

In one of the embodiments, the cross-sectional area S2 of the mixing chamber decreases from an end of the mixing chamber away from the air supply channel to an end of the mixing chamber close to the air supply channel, so that the An ejection area is formed between the mixing chamber and the air supply channel, and one end of the air intake pipe extends into the ejection area.

Above-mentioned second technical problem is solved by following technical scheme:

A gas-fired water heating device, the gas-fired water heating device includes a heat exchanger and any one of the above-mentioned combustion devices, the heat exchanger communicates with the combustion chamber, and the smoke exhaust structure cover is arranged on the The end of the heat exchanger facing away from the combustion chamber.

Compared with the background technology, the gas-fired hot water equipment according to the present invention has beneficial effects: the above combustion device is adopted, and a circulation pipe is arranged between the mixing chamber and the smoke exhaust structure, so that part of the smoke in the smoke exhaust structure is guided to In the mixing chamber, it enters the air supply channel to mix with the gas; after mixing, it is uniformly transported to the burner through the air supply channel for combustion. Since the primary air can be restricted from entering the mixing chamber, the flue gas can completely replace the primary air during mixing, so that the gas is no longer mixed with the primary air before entering the gas burner. In addition, the oxygen concentration in the flue gas is much lower than the oxygen concentration in the air, which is about 1/3~1/2 of that in the air. Therefore, in the process of gas mixing, the condition that the mixed gas reaches a flammable concentration can be effectively avoided, and the condition can be effectively improved. The combustion characteristics of the mixed gas reduce the risk of explosion and ensure stable combustion.

Description of drawings

The accompanying drawings constituting a part of this application are used to provide further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to explain the present invention, and do not constitute an improper limitation of the present invention.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

Fig. 1 is a schematic structural diagram of a gas-fired water heater described in an embodiment;

Fig. 2 is a schematic structural diagram of a gas-fired water heater with a control valve described in an embodiment;

Fig. 3 is a structural schematic diagram of the forced pumping gas hot water equipment described in one embodiment;

Fig. 4 is a schematic structural diagram of a gas-fired water heater as a balancing machine in one embodiment.

Reference signs:

100. Combustion device; 110. Combustion chamber; 111. Opening; 120. Smoke exhaust structure; 121. Smoke exhaust pipe; 122. Manifold; Mixing chamber; 1312, air supply channel; 1313, injection area; 132, intake 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, ejector; 150, fan; 151, volute; 200, heat exchanger; 210, water inlet pipe; 220, water outlet pipe; 300, shell; 310 ,aisle.

Detailed ways

In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, the present invention can be implemented in many other ways different from those described here, and those skilled in the art can make similar improvements without departing from the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

In one embodiment, please refer to FIG. 1 , a combustion device 100 includes: a combustion chamber 110 , a smoke exhaust structure 120 , a burner 140 and an air supply assembly 130 . The smoke exhaust structure 120 is used to exhaust part of the smoke generated in the combustion chamber 110 to the outside of the combustion device 100 . The combustion end of the burner 140 is located within the combustion chamber 110 . The air supply assembly 130 includes a mixing element 131 , an air intake pipe 132 and a circulation pipe 133 . The mixing element 131 is provided with a mixing cavity 1311 and an air supply channel 1312 connected to the mixing cavity 1311 . The intake pipe 132 communicates with the mixing chamber 1311 . One end of the circulation pipe 133 communicates with the smoke exhaust structure 120 , and the other end communicates with the mixing chamber 1311 . The mixing chamber 1311 is used to limit the entry of primary air, and the air supply channel 1312 communicates with the intake end of the burner 140 .

In the above-mentioned combustion device 100, a circulation pipe 133 is provided between the mixing chamber 1311 and the smoke exhaust structure 120, so that part of the smoke in the smoke exhaust structure 120 is guided into the mixing chamber 1311, and enters the gas supply channel 1312 to mix with the gas; Then it is uniformly transported to the burner 140 through the air supply channel 1312 for combustion. Since the primary air can be restricted in the mixing chamber 1311, during mixing, the flue gas can completely replace the primary air, so that the gas is no longer mixed with the primary air before entering the gas burner. In addition, the oxygen concentration in the flue gas is much lower than the oxygen concentration in the air, which is about 1/3~1/2 of that in the air. Therefore, in the process of gas mixing, it is effective to avoid the condition that the mixed gas reaches a flammable concentration, which will cause the mixed gas to burn. The combustion speed is significantly reduced, and the combustion potential is reduced by 35% to 50%, which effectively improves the combustion characteristics of the mixture, reduces the risk of explosion, and ensures stable combustion. In addition, the use of flue gas circulation can effectively reduce the flame temperature in the combustion process, which is beneficial to suppress the formation of nitrogen oxides, improve the control of pollutants in exhaust smoke, and improve the environmental protection index of the combustion device 100 accordingly.

It should be noted that the restriction of primary air entry in the mixing chamber 1311 should be understood as: the mixing chamber 1311 is only allowed to enter due to its own structural design. At this time, the primary air cannot enter the mixing chamber 1311 through the ejection effect or the blowing effect of the fan 150 . For example: except that the structure of the mixing chamber 1311 communicates with the air supply channel 1312, the circulation pipe 133 and the intake pipe 132, the remaining parts remain in a sealed state; All are sealed. In addition, if there is a fan 150 and other equipment in the combustion device 100 , the air outlet of the fan 150 is not connected to the mixing chamber 1311 , that is, part of the air cannot be blown into the mixing chamber 1311 . Wherein, “primary air” refers to the air that is pre-mixed with the gas before entering the burner 140 .

It should also be noted that the combustion device 100 of the present application can be applied to different equipment, for example: it can be applied to gas hot water equipment, and it can also be applied to gas stoves, as long as it can involve gas combustion equipment, it can be used The combustion device 100 of the present application is not listed one by one.

Further, please refer to FIG. 1 , the combustion device 100 further includes a fan 150 . The fan 150 is used to provide power for the flue gas to flow in the combustion device 100 , and is not connected to the mixing chamber 1311 , that is, the fan 150 is not connected to the mixing element 131 during design. In this way, the air blower 150 and the mixing chamber 1311 are not communicated, which can effectively prevent the airflow formed by the blower 150 from entering the mixing chamber 1311 and causing the oxygen concentration of the mixed gas to increase again.

It should be noted that there are at least two ways for the fan 150 to provide power for the flue gas flow, for example: strong suction type and strong drum type. Please refer to FIG. 3 , when the fan 150 is a strong suction type, the fan 150 provides suction for the flue gas flow; please refer to FIG. 1 , when the fan 150 is a strong drum type, the fan 150 provides a blowing force for the flue gas flow.

Further, please refer to FIG. 1 and FIG. 3 , the working end of the fan 150 is connected to the combustion chamber 110 or the exhaust structure 120 , so that the fan 150 drives the flue gas to flow stably in a strong drum or strong suction mode. Wherein, the working end can be the air outlet end or the air inlet end. For example: when the working end of the fan 150 is connected to the combustion chamber 110, the working end is the air outlet end, which provides blowing force for the flow of smoke; when the working end of the fan 150 is connected to the smoke exhaust structure 120, The working end is the air inlet end, which provides suction force for the flue gas flow.

In addition, please refer to FIG. 3 , when the fan 150 is connected to the smoke exhaust structure 120 , a volute 151 structure can be provided between the fan 150 and the smoke exhaust structure 120 to reduce the resistance of the smoke flow and ensure smooth smoke exhaust.

Optionally, the installation method of the fan 150 on the combustion chamber 110 or the smoke exhaust structure 120 may be welding, clamping, bolting, pinning, riveting and the like.

In one embodiment, please refer to FIG. 1 , the smoke exhaust structure 120 includes a smoke exhaust pipe 121 and a manifold 122 connected to the smoke exhaust pipe 121 . The exhaust pipe 121 communicates with the combustion chamber 110 . The circulation pipe 133 communicates with the manifold 122 . The angle α between the axis of the manifold 122 and the flow direction of the flue gas in the exhaust pipe 121 is an acute angle, that is, the oblique extension direction of the manifold 122 on the exhaust pipe 121 and the flow direction of the flue gas in the exhaust pipe 121 Keep the same direction, so that part of the flue gas derived from the exhaust pipe 121 obtains an initial dynamic pressure, which is conducive to the stability of the flue gas flow after the flue gas is derived, and effectively improves the regulation characteristics of the circulating flue gas flow. In order to facilitate the understanding of the axis of the manifold 122 and the flow direction of the smoke in the exhaust pipe 121, taking Figure 1 as an example, the axis of the manifold 122 is the line indicated by T1 in Figure 1; the flow of smoke in the exhaust pipe 121 The direction is the direction indicated by T2 in FIG. 1 .

It should be noted that the communication between the smoke exhaust pipe 121 and the combustion chamber 110 may be direct communication or indirect communication. Wherein, indirect communication should be understood as: there is an intermediate structure between the smoke exhaust pipe 121 and the combustion chamber 110 , through which the smoke circulation between the combustion chamber 110 and the smoke exhaust pipe 121 is realized.

Further, please refer to FIG. 1 , the angle α between the axis of the manifold 122 and the flow direction of the flue gas in the exhaust pipe 121 is 30°˜75°. In this way, the angle between the manifold 122 and the smoke exhaust pipe 121 is reasonably controlled, so that the flow of the exported smoke is more stable.

In one embodiment, please refer to FIG. 1 , the smoke exhaust structure 120 further includes a smoke collection hood 123 . The combustion chamber 110 is provided with an opening 111 . The smoke collecting hood 123 is set above the opening 111, and the smoke exhaust pipe 121 communicates with the smoke collecting hood 123. In this way, through the smoke collecting hood 123, the smoke discharged from the combustion chamber 110 is effectively gathered, so that the smoke can flow uniformly to the exhaust. be exhausted in the smoke pipe 121 to ensure smooth smoke exhaust.

It should be noted that the fume collecting hood 123 can be directly sealed and connected to the combustion chamber 110 ; it can also maintain a distance from one end of the combustion chamber 110 , etc., as long as the fume collecting hood 123 is in a state of covering relative to the opening 111 .

In addition, please refer to FIG. 3 , when the fan 150 is arranged on the smoke exhaust structure 120 , the fan 150 can be connected to the smoke collecting hood 123 through the volute 151 to realize stable and strong smoke exhaust.

In one embodiment, please refer to FIG. 1 , at least one section of the circulation pipe 133 is in contact with the combustion chamber 110 , so that the heat released from the surface of the combustion chamber 110 is used to heat the flue gas in the circulation pipe 133 to avoid condensation and precipitation of water vapor in the flue gas and affect the flow of smoke.

It should be noted that the way that the circulation pipe 133 is in contact with the combustion chamber 110 can be that at least one section of the circulation pipe 133 is placed close to the combustion chamber 110; or, at least one section of the circulation pipe 133 can be wound around the periphery of the combustion chamber 110, etc. .

Further, referring to FIG. 1 , at least one section of the circulation pipe 133 along its own length is a heating section 1331 . The heating section 1331 is attached to the combustion chamber 110 and extends along the height direction of the combustion chamber 110, so that the flue gas in the heating section 1331 can fully exchange heat with the combustion chamber 110, further avoiding the water vapor in the flue gas Condensation and precipitation affect the flow of flue gas. Wherein, in order to facilitate understanding of the height direction of the combustion chamber 110 , taking FIG. 1 as an example, the height direction of the combustion chamber 110 is the direction indicated by any arrow T3 in FIG. 1 .

In one embodiment, please refer to FIG. 2 , the combustion device 100 further includes a control valve 134 . The control valve 134 is arranged on the circulation pipe 133 and is used to control the on-off of the flue gas flow in the circulation pipe 133 and/or the adjustment of the circulation volume of the flue gas. It can be seen from this that when combustion is required, the control valve 134 is opened to allow a certain flow of flue gas to flow into the circulation pipe 133; 134 regulates the amount of flue gas circulation in the circulation pipe 133 to ensure the safety of gas combustion; meanwhile, it is also beneficial to improve the operating characteristics of the combustion device 100 . When the combustion is over, closing the control valve 134 can cut off the flow of flue gas in the circulation pipe 133 .

Optionally, the control valve 134 may be, but not limited to, a cut-off valve, a ball valve, a proportional valve, a butterfly valve, and the like.

In one embodiment, please refer to FIG. 1 , the combustion device 100 further includes an exhaust pipe 135 . The discharge pipe 135 communicates with the circulation pipe 133 to guide and discharge the condensed water in the circulation pipe 133 . In this way, through the discharge pipe 135 , the condensed water that may condense and accumulate in the flue gas circulation pipe 133 can be effectively removed, so as to keep the flue gas flow in the circulation pipe 133 stable.

Further, please refer to FIG. 1 , at least one section of the circulation pipe 133 is a first buffer section 1332 . The first buffer section 1332 is distributed closer to the exhaust pipe 121 than the heating section 1331 , and is arranged obliquely relative to the extending direction of the heating section 1331 . The discharge pipe 135 communicates with the first buffer section 1332 . It can be seen that the first buffer section 1332 is designed to be located at the upstream end of the heating section 1331 , so that when the flue gas flows in the circulation pipe 133 , it will first pass through the first buffer section 1332 and then flow into the heating section 1331 . Since the first buffer section 1332 is inclined relative to the extension direction of the heating section 1331, the first buffer section 1332 has a certain slope, which is beneficial to reduce the flue gas velocity in the first buffer section 1332, so that the water vapor that may be condensed and precipitated at the second A buffer section 1332 is slowed down, so that the condensed water vapor can be uniformly discharged from the discharge pipe 135 .

Specifically, please refer to FIG. 1 , the end of the first buffer section 1332 close to 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 .

In one embodiment, please refer to FIG. 1 , at least a section of the circulation pipe 133 is a second buffer section 1333 . The second buffer section 1333 is distributed closer to the mixing element 131 than the heating section 1331, and is arranged obliquely relative to the extension direction of the heating section 1331. The gas flow provides a certain resistance, which can slow down the flue gas flow 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.

Specifically, please refer to FIG. 1 , an end of the second buffer section 1333 close to the heating section 1331 is higher than an end of the second buffer section 1333 away from the heating section 1331 , and is set relatively close to the combustion chamber 110 .

In one embodiment, please refer to FIG. 1 , the combustion device 100 further includes a nozzle 136 . The nozzle 136 is installed on the intake pipe 132 and located between the mixing chamber 1311 and the air supply channel 1312 or in the air supply channel 1312 . In this way, the gas can be better transported into the mixing chamber 1311 by using the nozzle 136 so as to ensure stable combustion.

In one embodiment, please refer to FIG. 3 , when the intake end of the burner 140 is provided with an ejector 141 , the gas supply channel 1312 communicates with the ejector 141 to ensure stable delivery of gas. Of course, an adapter can be provided between the air supply channel 1312 and the injector 141 to achieve a stable connection between the two.

In one embodiment, referring to FIG. 1 , the cross-sectional area S1 of the air supply channel 1312 increases from an end of the air supply channel 1312 close to the mixing chamber 1311 to an end of the air supply channel 1312 close to the burner 140 . Wherein, "increasing" may include gradually increasing, and may also include first increasing, then remaining unchanged, and then increasing, etc., so that the air supply channel 1312 is designed with an expanded structure, and the flow velocity of the mixed gas in the air supply channel 1312 is slowed down. , to ensure the stability of the intake air in the burner 140, so as to improve the combustion characteristics.

In one embodiment, please refer to FIG. 1 , the cross-sectional area S2 of the mixing chamber 1311 decreases from the end of the mixing chamber 1311 away from the air supply channel 1312 to the end of the mixing chamber 1311 close to the air supply channel 1312, so that the mixing chamber An ejection area 1313 is formed between 1311 and the air supply channel 1312 , and one end of the intake pipe 132 protrudes into the ejection area 1313 . That is, the closer the mixing chamber 1311 is to the air supply channel 1312, the smaller its cross-sectional area S2, which can speed up the flow rate of the mixed gas into the air supply channel 1312, so that the gas can form an ejection force in the injection area 1313 to attract the mixed gas. The flue gas in the cavity 1311 flows toward the air supply channel 1212 to make it mix with the gas, which is beneficial to ensure stable combustion.

Specifically, please refer to FIG. 1 , the cross-sectional area S2 of the mixing chamber 1311 decreases from the end of the mixing chamber 1311 away from the air supply channel 1312 to the end of the mixing chamber 1311 close to the air supply channel 1312; the cross-section of the air supply channel 1312 The area S1 increases from the end of the air supply channel 1312 close to the mixing chamber 1311 to the end of the air supply channel 1312 close to the burner 140, so that a guide with the smallest cross-sectional area is formed between the mixing chamber 1311 and the air supply channel 1312. Shooting area 1313. At this time, the nozzle 136 on the intake pipe 132 is located in the injection area 1313 .

In one embodiment, please refer to FIG. 1 , which is a gas-fired water heater, which includes a heat exchanger 200 and the combustion device 100 in any one of the above embodiments. The heat exchanger 200 communicates with the combustion chamber 110 . The smoke exhaust structure 120 is disposed on an end of the heat exchanger 200 facing away from the combustion chamber 110 .

The above-mentioned gas hot water equipment adopts the above combustion device 100, and a circulation pipe 133 is arranged between the mixing chamber 1311 and the smoke exhaust structure 120, so that part of the smoke in the smoke exhaust structure 120 is guided into the mixing chamber 1311 and enters the air supply flow The fuel gas is mixed with the gas in the channel 1312; after being mixed, it is uniformly transported to the burner 140 through the gas supply channel 1312 for combustion. Since the primary air can be restricted in the mixing chamber 1311, during mixing, the flue gas can completely replace the primary air, so that the gas is no longer mixed with the primary air before entering the gas burner. In addition, the oxygen concentration in the flue gas is much lower than the oxygen concentration in the air, which is about 1/3~1/2 of that in the air. Therefore, in the process of gas mixing, the condition that the mixed gas reaches a flammable concentration can be effectively avoided, and the condition can be effectively improved. The combustion characteristics of the mixed gas reduce the risk of explosion and ensure stable combustion.

It should be noted that the gas water heating equipment at least further includes a casing 300 and a water inlet pipe 210 and a water outlet pipe 220 respectively connected to the heat exchanger 200 . Both the combustion chamber 110 and the heat exchanger 200 are located in the casing 300 . Please refer to FIG. 4 , when the gas water heater is a balancing machine, the casing 300 has a channel 310 . The smoke exhaust pipe 121 extends into the channel 310 , and there is a gap between the outer wall of the smoke exhaust tube 121 and the inner wall of the channel 310 .

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial" , "radial", "circumferential" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the referred device or Elements must have certain orientations, be constructed and operate in certain orientations, and therefore should not be construed as limitations on the invention.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection , or integrated; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediary, and it may be the internal communication of two components or the interaction relationship between two components, unless otherwise specified limit. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In the present invention, unless otherwise clearly specified and limited, the first feature may be in direct contact with the first feature or the first and second feature may be in direct contact with the second feature through an intermediary. touch. Moreover, "above", "above" and "above" the first feature on the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "beneath" and "beneath" the first feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is less horizontally than the second feature.

It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions are for the purpose of illustration only and are not intended to represent the only embodiments.

The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, should be considered as within the scope of this specification.

The above-mentioned embodiments only express several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but should not be construed as limiting the patent scope of the invention. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims

1. A combustion device, characterized in that, the combustion device (100) comprises: combustion chamber (110); A smoke exhaust structure (120), the smoke exhaust structure (120) is used to partially exhaust the smoke generated in the combustion chamber (110) out of the combustion device (100); a burner (140), the combustion end of the burner (140) is located in the combustion chamber (110); The air supply assembly (130), the air supply assembly (130) includes a mixing piece (131), an air inlet pipe (132) and a circulation pipe (133), and a mixing chamber (1311) and a mixing chamber (1311) and The air supply channel (1312) connected to the mixing chamber (1311), the air intake pipe (132) communicates with the air supply channel (1312), and one end of the circulation pipe (133) is connected to the smoke exhaust structure ( 120), the other end communicates with the mixing chamber (1311), the mixing chamber (1311) is used to limit the entry of primary air, and the air supply channel (1312) is connected with the intake air of the burner (140) end connection.

2. The combustion device according to claim 1, characterized in that, the combustion device (100) further comprises a blower fan (150), and the blower fan (150) is used for blowing smoke into the combustion device (100). Flow provides power and is not in communication with the mixing chamber (1311).

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

4. The combustion device according to claim 1, characterized in that, the smoke exhaust structure (120) comprises a smoke exhaust pipe (121) and a manifold (122) connected to the smoke exhaust pipe (121), The angle α between the axis of the manifold (122) and the flow direction of the flue gas in the exhaust pipe (121) is an acute angle, and the exhaust pipe (121) communicates with the combustion chamber (110) , the circulation pipe (133) communicates with 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 flow direction of the flue gas in the exhaust pipe (121) is 30°- 75°.

6. The combustion device according to claim 4, characterized in that, the smoke exhaust structure (120) further comprises a smoke collecting hood (123), the combustion chamber (110) is provided with an opening (111), the A smoke collecting hood (123) is arranged above the opening (111), and the smoke exhaust pipe (121) communicates with the smoke collecting hood (123).

7. The combustion device according to claim 1, characterized in that at least one section of the circulation pipe (133) is in contact with the combustion chamber (110).

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

9. The combustion device according to any one of claims 1-8, characterized in that, the combustion device (100) further comprises a control valve (134), and the control valve (134) is arranged in the circulation pipe ( 133), and is used to control the on-off of the flue gas flow in the circulation pipe (133) and/or the adjustment of the flue gas circulation amount; and/or, The combustion device (100) further includes a discharge pipe (135), the discharge pipe (135) communicates with the circulation pipe (133), so as to guide and discharge the condensed water in the circulation pipe (133); and/ or, The combustion device (100) also includes a nozzle (136), the nozzle (136) is installed on the inlet pipe (132), and is located between the mixing chamber (1311) and the air supply channel (1312). between or within the air supply channel (1312).

10. The combustion device according to any one of claims 1-8, characterized in that, the cross-sectional area S1 of the air supply channel (1312) approaches the mixing chamber ( 1311) increases to the end of the air supply channel (1312) close to the burner (140).

11. The combustion device according to claim 10, characterized in that, the cross-sectional area S2 of the mixing chamber (1311) is from an end of the mixing chamber (1311) away from the air supply channel (1312) to the The end of the mixing chamber (1311) close to the air supply channel (1312) is reduced, so that an injection area (1313) is formed between the mixing chamber (1311) and the air supply channel (1312), and the inlet One end of the trachea (132) protrudes into the injection region (1313).

12. A gas-fired water heater, characterized in that the gas-fired water heater comprises a heat exchanger (200) and the combustion device (100) according to any one of claims 1-11, the heat exchanger ( 200) communicates with the combustion chamber (110), and the smoke exhaust structure (120) is covered on an end of the heat exchanger (200) facing away from the combustion chamber (110).