CN216953572U - Combustion device and gas water heating equipment - Google Patents

Abstract

The utility model relates to a combustion device and gas water heating equipment.A circulating pipe is arranged between a mixing cavity and a smoke exhaust structure, so that part of smoke in the smoke exhaust 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 to a combustor through an air supply flow passage for combustion. Because 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 not mixed with the primary air before entering the gas 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 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 stable combustion is ensured.

Description

Combustion device and gas water heating equipment

Technical Field

The utility model relates to the technical field of gas combustion, in particular to a combustion device and gas water heating equipment.

Background

When the gas appliance uses gas with high combustion speed, the combustion potential of the gas is large. When the atmospheric combustion mode is adopted, after the gas is mixed with primary air, the gas concentration of the mixed gas is in a combustible range, and deflagration is easy to occur in a combustor and a combustion chamber, so that the use of a gas appliance is influenced, even safety accidents are caused, and the utilization of the gas is influenced.

SUMMERY OF THE UTILITY MODEL

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

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

The first technical problem is solved by the following technical scheme:

a combustion apparatus, comprising: a combustion chamber; the smoke exhaust structure is used for exhausting part of smoke generated in the combustion chamber out of the combustion device; a burner, a combustion end of the burner being located within the combustion chamber; air feed subassembly, the air feed subassembly includes mixing piece, intake pipe and circulating pipe, be equipped with the hybrid chamber in the mixing piece and communicate in the air feed runner of hybrid chamber, the intake pipe with air feed runner intercommunication, circulating pipe one end with the structure intercommunication of discharging fume, the other end with the hybrid chamber intercommunication, be used for restricting primary air admission in the hybrid chamber, the air feed runner with the inlet end intercommunication of combustor.

Compared with the background art, the combustion device of the utility model has the following beneficial effects: a circulating pipe is arranged between the mixing cavity and the smoke exhaust structure, so that part of smoke in the smoke exhaust structure is guided into the mixing cavity and enters the gas supply flow channel to be mixed with fuel gas; after mixing, the mixture is uniformly conveyed to a combustor through an air supply flow passage for combustion. Because 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 not mixed with the primary air before entering the gas 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 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 stable combustion is ensured.

In one embodiment, the combustion device further comprises a fan, wherein the fan is used for providing power for the flow of the flue gas in the combustion device and is not communicated with the mixing cavity.

In one embodiment, the working end of the fan is communicated with the combustion chamber or the smoke exhausting structure.

In one embodiment, the smoke exhaust structure comprises a smoke exhaust pipe and a manifold communicated with the smoke exhaust pipe, an included angle alpha between the axis of the manifold and the flow direction of smoke in the smoke exhaust pipe is an acute angle, the smoke exhaust pipe is communicated with the combustion chamber, and the circulating pipe is communicated with the manifold.

In one embodiment, the included angle alpha between the axis of the manifold and the flow direction of the smoke in the smoke exhaust pipe is 30-75 degrees.

In one embodiment, the smoke exhaust structure further comprises a smoke collecting hood, an opening is formed in the combustion chamber, the smoke collecting hood is arranged above the opening, and the smoke exhaust pipe is communicated with the smoke collecting hood.

In one embodiment, at least a section of the circulation tube is in contact with the combustion chamber.

In one embodiment, at least one section of the circulating pipe along the length direction of the circulating 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 embodiment, the combustion device further comprises a control valve, wherein the control valve is arranged on the circulating pipe and is used for controlling the on-off of the flow of the flue gas in the circulating pipe and/or the regulation of the circulating amount of the flue gas.

In one embodiment, the combustion apparatus further comprises a discharge pipe communicating with the circulation pipe to guide the condensed water in the circulation pipe to be discharged.

In one embodiment, the combustion apparatus further includes a nozzle installed on the air inlet pipe and located between the mixing chamber and the air supply flow passage or located in the air supply flow passage.

In one embodiment, the cross-sectional area S1 of the air supply passageway increases from the end of the air supply passageway near the mixing chamber to the end of the air supply passageway near the burner.

In one embodiment, the cross-sectional area S2 of the mixing chamber is reduced from the end of the mixing chamber far from the air supply channel to the end of the mixing chamber near the air supply channel, so that an injection area is formed between the mixing chamber and the air supply channel, and one end of the air inlet pipe extends into the injection area.

The second technical problem is solved by the following technical solutions:

the gas water heating equipment comprises a heat exchanger and the combustion device, wherein the heat exchanger is communicated with the combustion chamber, and the smoke exhaust structure is covered on one end of the heat exchanger, which is back to the combustion chamber.

Compared with the background art, the gas water heating equipment has the beneficial effects that: by adopting the combustion device, the circulating pipe is arranged between the mixing cavity and the smoke exhaust structure, so that part of smoke in the smoke exhaust structure is guided into the mixing cavity and enters the gas supply flow channel to be mixed with gas; after mixing, the mixture is uniformly conveyed to a combustor through an air supply flow passage to be combusted. Because 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 not mixed with the primary air before entering the gas 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 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 stable combustion is ensured.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic diagram of a gas-fired water heating apparatus according to an embodiment;

FIG. 2 is a schematic diagram of a gas-fired water heating apparatus with a control valve according to an embodiment;

FIG. 3 is a schematic structural diagram of a strong pumping gas-fired water heating apparatus according to an embodiment;

fig. 4 is a schematic structural diagram of a gas-fired water heating device as a balancing machine in one embodiment.

Reference numerals are as follows:

100. a combustion device; 110. a combustion chamber; 111. an opening; 120. a smoke evacuation structure; 121. a smoke exhaust pipe; 122. a manifold; 123. a smoke collecting hood; 130. a gas supply assembly; 131. a mixing member; 1311. a mixing chamber; 1312. an air supply flow channel; 1313. an ejection area; 132. an air inlet pipe; 133. a circulation pipe; 1331. a heating section; 1332. a first buffer section; 1333. a second buffer section; 134. a control valve; 135. a discharge pipe; 136. a nozzle; 140. a burner; 141. an ejector; 150. a fan; 151. a volute; 200. a heat exchanger; 210. a water inlet pipe; 220. a water outlet pipe; 300. a housing; 310. a channel.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In one embodiment, referring to fig. 1, a combustion apparatus 100, the combustion apparatus 100 includes: a combustion chamber 110, a smoke evacuation structure 120, a burner 140, and an air supply assembly 130. The smoke evacuation structure 120 is used to evacuate a portion of the flue gas generated in the combustion chamber 110 out 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 part 131, an air inlet pipe 132, and a circulation pipe 133. A mixing chamber 1311 and a gas supply flow passage 1312 communicating with the mixing chamber 1311 are provided in the mixing member 131. The intake pipe 132 communicates with the mixing chamber 1311. The circulation pipe 133 has one end communicating with the smoke evacuation structure 120 and the other end communicating with the mixing chamber 1311. The mixing chamber 1311 is configured to restrict the entry of primary air, and the air supply channel 1312 communicates with the air intake end of the burner 140.

In the combustion apparatus 100, the circulating pipe 133 is disposed between the mixing chamber 1311 and the smoke exhausting structure 120, so that a part of the smoke in the smoke exhausting structure 120 is guided into the mixing chamber 1311 and enters the gas supply channel 1312 to be mixed with the gas; after mixing, the mixture is uniformly delivered to the burner 140 through the air supply channel 1312 for combustion. Because the mixing chamber 1311 can restrict the primary air from entering, the flue gas can completely replace the primary air during mixing, so that the gas is not mixed with the primary air before entering the gas 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 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 speed of the mixed gas is obviously reduced, the combustion potential reduction range is 35% -50%, the combustion characteristic of the mixed gas is effectively improved, the occurrence of combustion and explosion risks is reduced, and the stable combustion is ensured. In addition, the flue gas circulation mode can effectively reduce the flame temperature in the combustion process, is beneficial to inhibiting the generation of nitrogen oxides, improves the control of pollutants in the discharged smoke, and correspondingly improves the environmental protection index of the combustion device 100.

It should be noted that the use of the mixing chamber 1311 to restrict the entry of primary air should be understood as: the mixing chamber 1311 is designed to allow only smoke to enter. At this time, the primary air cannot enter the mixing chamber 1311 through an injection action or a blowing action of the fan 150. For example: the mixing chamber 1311 is constructed such that the remaining portions thereof are kept in a sealed state except for the communication with the air supply flow path 1312, the circulation pipe 133 and the air inlet pipe 132; meanwhile, the connection between the mixing chamber 1311 and the intake pipe 132 and the circulation pipe 133, respectively, is sealed. In addition, if the combustion apparatus 100 includes a fan 150 or other devices, the air outlet of the fan 150 is not communicated with the mixing chamber 1311, i.e., a part of the air cannot be blown into the mixing chamber 1311. Where "primary air" refers to air that is premixed with the combustion gases prior to entering the combustor 140.

It is further noted that the combustion device 100 of the present application can be applied in different apparatuses, such as: the combustion device 100 of the present application can be applied to gas water heating equipment, gas stove, and the like, as long as the equipment related to gas combustion can be used, which is not listed.

Further, referring to fig. 1, the combustion apparatus 100 further includes a fan 150. The fan 150 is used to provide power for the flow of flue gas in the combustion apparatus 100 and is not in communication with the mixing chamber 1311, i.e., the fan 150 is not in communication with the mixing element 131 when designed. Therefore, the fan 150 and the mixing chamber 1311 are not communicated with each other, so that the situation that the oxygen concentration of the mixed gas is increased again due to the fact that the air flow formed by the fan 150 enters the mixing chamber 1311 can be effectively avoided.

It should be noted that there are at least two ways for the fan 150 to provide power for the flow of the flue gas, for example: strong pumping and strong drum. Referring to fig. 3, when the fan 150 is a strong draft type, the fan 150 provides a suction force for the smoke flowing; referring to fig. 1, when the fan 150 is a strong drum type, the fan 150 provides a blowing force for the flow of the flue gas.

Further, referring to fig. 1 and fig. 3, the working end of the fan 150 is connected to the combustion chamber 110 or the smoke exhausting structure 120, so that the fan 150 drives the smoke to flow stably in a forced-blowing or forced-pumping manner. Wherein, the working end can be an air outlet end or an air inlet end. Such as: when the working end of the fan 150 is communicated with the combustion chamber 110, the working end is an air outlet end, and provides blowing force for the flow of the flue gas; when the working end of the fan 150 is connected to the smoke evacuation structure 120, the working end is the air intake end, which provides suction for the smoke flowing.

In addition, referring to fig. 3, when the fan 150 is connected to the smoke exhausting structure 120, a volute 151 structure may be disposed between the fan 150 and the smoke exhausting structure 120 to reduce the resistance of the flow of the smoke and ensure smooth smoke exhausting.

Alternatively, the fan 150 may be mounted on the combustion chamber 110 or the smoke evacuation structure 120 by welding, snapping, bolting, pinning, riveting, or the like.

In one embodiment, referring to FIG. 1, smoke evacuation structure 120 includes smoke evacuation tube 121 and manifold 122 in communication with smoke evacuation tube 121. The smoke exhaust pipe 121 communicates with the combustion chamber 110. The circulation pipe 133 communicates with the manifold 122. An included angle alpha between the axis of the manifold 122 and the smoke flowing direction in the smoke discharge pipe 121 is an acute angle, that is, the inclined extending direction of the manifold 122 on the smoke discharge pipe 121 and the smoke flowing direction in the smoke discharge pipe 121 keep the same orientation, so that part of smoke led out from the smoke discharge pipe 121 obtains initial dynamic pressure, stable smoke flowing after being led out is facilitated, and the regulation characteristic of the circulating smoke flow is effectively improved. To facilitate understanding of the axis of manifold 122 and the direction of flue gas flow within smoke exhaust 121, taking FIG. 1 as an example, the axis of manifold 122 is the line denoted by T1 in FIG. 1; the direction of the flue gas flow in the flue gas discharge pipe 121 is the direction indicated by T2 in fig. 1.

It should be noted that the communication between smoke exhaust pipe 121 and combustion chamber 110 may be direct communication; or may be indirect. Where indirect communication is understood to be: an intermediate structure is further arranged between the smoke exhaust pipe 121 and the combustion chamber 110, and smoke circulation between the combustion chamber 110 and the smoke exhaust pipe 121 is realized through the intermediate structure.

Further, referring to fig. 1, an included angle α between the axis of the manifold 122 and the flow direction of the flue gas in the smoke discharge pipe 121 is 30 ° to 75 °. So, the contained angle between reasonable control manifold 122 and the pipe 121 of discharging fume for the flue gas after the derivation flows more stably.

In one embodiment, referring to fig. 1, the smoke evacuation 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 arranged above the opening 111 in a covering mode, the smoke exhaust pipe 121 is communicated with the smoke collecting hood 123, therefore, smoke exhausted by the combustion chamber 110 is effectively collected through the smoke collecting hood 123, the smoke is conveniently exhausted from the smoke exhaust pipe 121 in a unified flow mode, and the smooth smoke exhaust is guaranteed.

It should be noted that the smoke collecting hood 123 can be directly connected to the combustion chamber 110 in a sealing manner; and the distance between the cover and the combustion chamber 110 can be kept, and the cover can be arranged above the smoke collecting cover 123 relative to the opening 111.

In addition, referring to fig. 3, when the fan 150 is disposed on the smoke exhausting structure 120, the fan 150 can be communicated with the smoke collecting hood 123 through the volute 151 to realize stable strong suction type smoke exhausting.

In one embodiment, referring to fig. 1, at least a 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 utilized to heat the flue gas in the circulation pipe 133, thereby preventing the moisture in the flue gas from condensing and separating out to affect the flow of the flue gas.

It should be noted that the way of contacting the circulating pipe 133 with the combustion chamber 110 may be to arrange at least one section of the circulating pipe 133 closely to the combustion chamber 110; alternatively, at least one section of the circulation pipe 133 may be wound around the outer periphery of the combustion chamber 110, or the like.

Further, referring to fig. 1, at 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 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, and further the influence on the flow of the flue gas caused by the condensation and separation of the water vapor in the flue gas is avoided. For convenience of understanding the height direction of the combustion chamber 110, the height direction of the combustion chamber 110 is indicated by any arrow T3 in fig. 1, taking fig. 1 as an example.

In one embodiment, referring to fig. 2, the combustion apparatus 100 further comprises a control valve 134. The control valve 134 is disposed on the circulation pipe 133 and is used for controlling the on/off of the flow of the flue gas in the circulation pipe 133 and/or the adjustment of the circulation amount of the flue gas. Therefore, when combustion is required, the control valve 134 is opened to allow a certain flow of flue gas to be introduced into the circulating pipe 133; if the mixing ratio between the fuel gas and the flue gas in the mixed gas does not meet the preset condition, the circulating amount of the flue gas in the circulating pipe 133 can be adjusted through the control valve 134, so that the safety of fuel gas combustion is ensured; while also facilitating improved operating characteristics of the combustion apparatus 100. When combustion is complete, the control valve 134 is closed to shut off the flow of flue gas in the circulation duct 133.

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

In one embodiment, referring to fig. 1, the combustion apparatus 100 further comprises a discharge pipe 135. The discharge pipe 135 communicates with the circulation pipe 133 to guide and discharge the condensed water inside the circulation pipe 133. Thus, the condensed water which may be condensed and accumulated in the flue gas circulation pipe 133 can be effectively discharged through the discharge pipe 135 to maintain the flow of the flue gas in the circulation pipe 133 stable.

Further, referring 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 smoke exhaust pipe 121 than the heating section 1331, and is disposed obliquely with respect 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 the flue gas flows through the first buffer section 1332 and then into the heating section 1331 as it flows through the circulation pipe 133. Because the first buffer section 1332 is inclined relative to the extending direction of the heating section 1331, the first buffer section 1332 has a certain slope, which is beneficial to reducing the flow rate of the flue gas in the first buffer section 1332, so that the moisture possibly condensed out is all slowed down in the first buffer section 1332, and the condensed moisture is conveniently discharged from the discharge pipe 135 in a unified manner.

Specifically, referring to fig. 1, an end of the first buffer section 1332 near the heating section 1331 is lower than an end of the first buffer section 1332 far from the heating section 1331 and is disposed relatively close to the combustion chamber 110.

In one embodiment, referring to FIG. 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 part 131 than the heating section 1331, and is inclined with respect to the extending direction of the heating section 1331, that is, a pipeline with a certain gradient is also arranged at the downstream end of the heating section 1331, so as to provide a certain resistance to the flow of the flue gas in the heating section 1331, slow down the flow of the 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 separation of water vapor in the flue gas.

Specifically, referring to fig. 1, one end of the second buffer section 1333 close to the heating section 1331 is higher than one end of the second buffer section 1333 far from the heating section 1331, and is disposed relatively close to the combustion chamber 110.

In one embodiment, referring to FIG. 1, the combustion apparatus 100 further comprises a nozzle 136. The nozzle 136 is mounted on the air inlet pipe 132 and is positioned between the mixing chamber 1311 and the air supply flow passage 1312 or within the air supply flow passage 1312. In this way, the use of the nozzle 136 allows better delivery of the gas into the mixing chamber 1311, so as to guarantee a stable combustion.

In one embodiment, referring to fig. 3, when the injector 141 is disposed at the air inlet end of the burner 140, the air supply channel 1312 is communicated with the injector 141 to ensure stable gas delivery. Of course, an adapter may be disposed between the air supply channel 1312 and the ejector 141 to achieve stable connection therebetween.

In one embodiment, referring to FIG. 1, the cross-sectional area S1 of air supply channel 1312 increases from the end of air supply channel 1312 near mixing chamber 1311 to the end of air supply channel 1312 near burner 140. The "increase" may include gradual increase, or first increase, then do not change, then increase, etc., so that the air supply channel 1312 is in an expanded structure design, the flow rate of the mixture in the air supply channel 1312 is reduced, and the stable air intake in the burner 140 is ensured, so as to improve the combustion characteristics.

In one embodiment, referring 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 gas supply channel 1312 to the end of the mixing chamber 1311 near the gas supply channel 1312 such that an ejector region 1313 is formed between the mixing chamber 1311 and the gas supply channel 1312, and an end of the gas inlet 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 the cross-sectional area S2 is, so that the flow velocity of the mixed gas into the gas supply channel 1312 can be increased, the injection force can be formed in the injection region 1313 by the fuel gas, the flue gas in the mixing chamber 1311 is attracted to flow toward the gas supply channel 1212, and the flue gas is mixed with the fuel gas, thereby facilitating the guarantee of stable combustion.

Specifically, referring to FIG. 1, the cross-sectional area S2 of mixing chamber 1311 decreases from the end of mixing chamber 1311 distal from gas supply flow passage 1312 to the end of mixing chamber 1311 proximal to gas supply flow passage 1312; the cross-sectional area S1 of the air supply channel 1312 increases from the end of the air supply channel 1312 near the mixing chamber 1311 to the end of the air supply channel 1312 near the burner 140 such that an induction zone 1313 of minimum cross-sectional area is formed between the mixing chamber 1311 and the air supply channel 1312. At this time, the nozzle 136 of the inlet pipe 132 is positioned in the injection region 1313.

In one embodiment, please refer to fig. 1, a gas-fired water heating apparatus includes a heat exchanger 200 and the combustion device 100 of any of the above embodiments. The heat exchanger 200 communicates with the combustion chamber 110. The smoke evacuation structure 120 is covered on an end of the heat exchanger 200 facing away from the combustion chamber 110.

In the above gas water heating apparatus, the above combustion apparatus 100 is adopted, and the circulating pipe 133 is disposed between the mixing chamber 1311 and the smoke exhaust structure 120, so that a 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 be mixed with the gas; after mixing, the mixture is uniformly delivered to the burner 140 through the air supply channel 1312 for combustion. Because the mixing chamber 1311 can restrict the primary air from entering, the flue gas can completely replace the primary air during mixing, so that the gas is not mixed with the primary air before entering the gas 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 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 stable combustion is ensured.

It should be noted that the gas-fired water heating apparatus at least further includes a housing 300, and an inlet pipe 210 and an outlet pipe 220 respectively communicated with the heat exchanger 200. The combustion chamber 110 and the heat exchanger 200 are both located within the housing 300. Referring to fig. 4, when the gas-fired water heating apparatus is a balancer, the housing 300 has a channel 310. Smoke exhaust pipe 121 extends into this passage 310, and there is a gap between the outer side wall of smoke exhaust pipe 121 and the inner wall of passage 310.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the utility model.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. 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. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the utility model, and these changes and modifications are all within the scope of the utility model. Therefore, the protection scope of the present patent should be subject to the appended claims.

Claims (12)

1. A combustion device, characterized in that the combustion device (100) comprises:

a combustion chamber (110);

a smoke evacuation structure (120), the smoke evacuation structure (120) being configured to evacuate a portion of the smoke generated in the combustion chamber (110) out of the combustion device (100);

a burner (140), a combustion end of the burner (140) being located within the combustion chamber (110);

the gas supply assembly (130), the gas supply assembly (130) includes a mixing part (131), a gas inlet pipe (132) and a circulating pipe (133), a mixing cavity (1311) and a gas supply flow channel (1312) communicated with the mixing cavity (1311) are arranged in the mixing part (131), the gas inlet pipe (132) is communicated with the gas supply flow channel (1312), one end of the circulating pipe (133) is communicated with the smoke exhaust structure (120), the other end of the circulating pipe is communicated with the mixing cavity (1311), primary air is limited to enter the mixing cavity (1311), and the gas supply flow channel (1312) is communicated with a gas inlet end of the combustor (140).

2. The combustion device according to claim 1, wherein the combustion device (100) further comprises a fan (150), the fan (150) being adapted to power the flow of flue gases in the combustion device (100) and being not in communication with the mixing chamber (1311).

3. The combustion device as claimed in claim 2, wherein the working end of the fan (150) is connected to the combustion chamber (110) or the smoke evacuation structure (120).

4. The combustion device as claimed in claim 1, wherein the smoke exhaust structure (120) comprises a smoke exhaust pipe (121) and a manifold (122) communicated with the smoke exhaust pipe (121), an included angle α between an axis of the manifold (122) and a smoke flowing direction in the smoke exhaust pipe (121) is an acute angle, the smoke exhaust pipe (121) is communicated with the combustion chamber (110), and the circulation pipe (133) is communicated with the manifold (122).

5. A burner apparatus according to claim 4, wherein the angle α between the axis of the manifold (122) and the direction of the flue gas flow in the flue gas discharge duct (121) is between 30 ° and 75 °.

6. The combustion apparatus according to claim 4, wherein the smoke exhaust structure (120) further comprises a smoke collecting hood (123), the combustion chamber (110) is provided with an opening (111), the smoke collecting hood (123) is covered above the opening (111), and the smoke exhaust pipe (121) is communicated with the smoke collecting hood (123).

7. A combustion unit according to claim 1, characterized in that at least a section of said circulation duct (133) is in contact with said combustion chamber (110).

8. The combustion device as claimed in claim 7, wherein the circulation pipe (133) is a heating section (1331) along at least one section of its length, and the heating section (1331) is attached to the combustion chamber (110) and extends along the height direction of the combustion chamber (110).

9. The combustion device according to any one of claims 1 to 8, wherein the combustion device (100) further comprises a control valve (134), and the control valve (134) is arranged on the circulating pipe (133) and is used for controlling the on-off of the flow of the flue gas in the circulating pipe (133) and/or the adjustment of the circulating amount of the flue gas; and/or the presence of a gas in the gas,

the combustion device (100) further comprises a discharge pipe (135), wherein the discharge pipe (135) is communicated with the circulating pipe (133) to guide and discharge the condensed water in the circulating pipe (133); and/or the presence of a gas in the gas,

the combustion device (100) further comprises a nozzle (136), wherein the nozzle (136) is arranged on the air inlet pipe (132) and is positioned between the mixing cavity (1311) and the air supply flow passage (1312) or in the air supply flow passage (1312).

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

11. The combustion device according to claim 10, wherein the cross-sectional area S2 of the mixing chamber (1311) decreases from the end of the mixing chamber (1311) remote from the air supply channel (1312) to the end of the mixing chamber (1311) close to the air supply channel (1312) such that an ejector region (1313) is formed between the mixing chamber (1311) and the air supply channel (1312), and wherein one end of the air inlet pipe (132) protrudes into the ejector region (1313).

12. A gas-fired water heating apparatus, characterized in that it comprises a heat exchanger (200) and a combustion device (100) according to any one of claims 1 to 11, the heat exchanger (200) being in communication with the combustion chamber (110), the smoke evacuation structure (120) being housed at the end of the heat exchanger (200) facing away from the combustion chamber (110).

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