CN114526483A

CN114526483A - Combustor and gas equipment

Info

Publication number: CN114526483A
Application number: CN202011206778.XA
Authority: CN
Inventors: 钱晓林; 梁泽锋; 李鑫; 陆祖安; 曲绍鹤
Original assignee: Midea Group Co Ltd; Wuhu Midea Kitchen and Bath Appliances Manufacturing Co Ltd
Current assignee: Midea Group Co Ltd; Wuhu Midea Kitchen and Bath Appliances Manufacturing Co Ltd
Priority date: 2020-10-30
Filing date: 2020-10-30
Publication date: 2022-05-24

Abstract

The invention discloses a combustor and gas equipment. The combustor comprises a combustion main body, an air inlet assembly and a premixer, wherein the combustion main body forms a first combustion chamber and a second combustion chamber and is used for heating the temperature in the first combustion chamber to a preset temperature, and the second combustion chamber is provided with a smoke outlet; the gas inlet assembly is used for connecting gas; the air inlet assembly is used for accessing air to the first combustion chamber; the premixer is provided with a mixing cavity which is respectively communicated with the air inlet assembly and the smoke outlet for mixing and injects mixed gas to the second combustion chamber so as to enable the second combustion chamber to carry out high-temperature air combustion. In the invention, the gas provided by the gas inlet component entrains primary air to the first combustion chamber and ignites the primary air; the air inlet assembly sucks secondary air, and the combustion main body burns to generate high-temperature flue gas; after the gas and the flue gas at the flue gas outlet are mixed by the premixer, the mixed gas is injected into the second combustion chamber to generate a entrainment effect, so that the purpose of high-temperature air combustion is achieved.

Description

Combustor and gas equipment

Technical Field

The invention relates to the technical field of high-temperature air combustion, in particular to a combustor and gas equipment.

Background

High temperature air combustion (high temperature air combustion) technology is a MILD combustion mode under low oxygen dilution conditions, also known as MILD combustion. The main combustion characteristics are as follows: low reaction rate, less local heat release, uniform heat flow distribution, low combustion peak temperature, low noise and the like. Because the MILD combustion temperature field is more uniform, the combustion peak temperature is low, the generation of thermal nitrogen oxides is reduced, and compared with a common combustion mode, the emission of pollutants NOx and CO can be greatly reduced.

Although high temperature air combustion has many of the advantages described above, it is currently an industrial application and is not used in everyday life.

Disclosure of Invention

The invention mainly aims to provide a combustor with a high-temperature air combustion function and gas equipment.

To achieve the above object, the present invention provides a burner comprising:

the combustion body is formed with a first combustion chamber and a second combustion chamber which are sequentially communicated, the combustion body is used for being ignited in the first combustion chamber so as to heat the temperature in the first combustion chamber to a preset temperature, and the second combustion chamber is provided with a smoke outlet;

the gas inlet assembly is used for connecting gas and communicated with the first combustion chamber;

the air inlet assembly is used for accessing air to the first combustion chamber; and the number of the first and second groups,

and the premixer is provided with a mixing cavity, the mixing cavity is respectively communicated with the air inlet assembly and the smoke outlet and is used for mixing, and mixed gas is injected into the second combustion chamber, so that high-temperature air combustion is carried out in the second combustion chamber.

In one embodiment, the premixer includes a housing forming the mixing chamber, and a return duct communicating with the mixing chamber and the flue gas outlet, respectively.

In one embodiment, a plurality of injection ports are arranged at intervals on the side part of the second combustion chamber;

the premixer also comprises an air distribution structure, and the mixing cavity is communicated with the plurality of injection ports in a one-to-one correspondence manner through the air distribution structure.

In one embodiment, the gas distribution structure is provided with a gas distribution cavity, the gas distribution cavity comprises a first chamber and a second chamber which are sequentially communicated, the gas inlet of the first chamber is communicated with the mixing cavity, and the gas outlet of the second chamber is communicated with the second combustion chamber;

the second chamber is arranged along the gas flowing direction in a gradually expanding mode.

In one embodiment, two gas distributing structures are arranged on the gas distributing structure corresponding to two opposite sides of the second combustion chamber;

the mixing cavity is respectively communicated with the two gas distributing structures.

In one embodiment, the air inlet assembly comprises an air draft assembly, and the air draft assembly is arranged at the smoke outlet.

In one embodiment, the combustion body comprises:

a housing forming the first combustion chamber and the second combustion chamber; and the number of the first and second groups,

the atmospheric burner is used for igniting in the first combustion chamber so as to heat the temperature in the first combustion chamber to a preset temperature.

In one embodiment, when the air draft assembly is in operation, the drawn air circulates in a first direction in the first combustion chamber;

the atmospheric burner comprises a combustion single body arranged in the first combustion chamber, the combustion single body is provided with an airflow channel used for circulating mixed gas, and the airflow channel is arranged in a penetrating way along the first direction.

In one embodiment, the atmospheric burner comprises a combustion unit formed with an airflow channel, a combustion assembly arranged at an air outlet of the airflow channel, and an ignition device arranged in the first combustion chamber and used for igniting the combustion assembly.

In one embodiment, the combustion assembly includes a plate-shaped body covering the air outlet of the airflow channel, and a plurality of air vents penetrating through the plate-shaped body in a thickness direction of the plate-shaped body.

In one embodiment, the plate-shaped body has two first outer peripheral sides which are oppositely arranged;

the plate-shaped body is inclined from the two first outer peripheral sides to the center in a direction gradually facing the airflow channel.

In one embodiment, the combustion assembly further includes two guide plates respectively protruding at two first outer peripheral sides of the plate-like body, the two guide plates extending in directions away from each other in a direction protruding from the plate-like body.

In one embodiment, the guide plate is provided with an air supply port extending through the guide plate in the thickness direction.

In one embodiment, a plurality of the vent holes are arranged on the plate-shaped body in a grid shape; and/or the presence of a gas in the gas,

the air supply ports are arranged in a plurality of grids on the guide plate.

In an embodiment, the burner further includes a control device and a flame sensing device, wherein the control device is electrically connected to the flame sensing device and the first air draft assembly, so that when the flame sensing device senses that the burning main body is ignited, the first air draft assembly is controlled to work.

In one embodiment, the atmospheric burner comprises a plurality of combustion units, each of which has a gas flow channel for circulating a mixed gas;

the gas inlet assembly comprises a gas pipeline and a gas distributing rod, and the gas pipeline is communicated with a plurality of gas flow channels of the combustion monomers in a one-to-one correspondence mode through the gas distributing rod.

In one embodiment, the intake assembly includes a gas conduit including two gas flow passages, one of the two gas flow passages communicating with the first combustion chamber and the other communicating with the premixer, and a gas proportional valve for regulating a gas flow rate of each of the gas flow passages.

In addition, in order to achieve the above object, the present invention further provides a gas appliance, comprising a heat exchanger and the burner as described above, wherein the heat exchanger produces hot water by using heat generated by the burner.

In one embodiment, the gas equipment further comprises a main body, the main body is provided with a heat exchange chamber communicated with the second combustion chamber, and the heat exchange chamber is provided with a smoke outlet;

the air draft assembly is arranged at a smoke exhaust port of the heat exchange chamber, and the premixer is connected with the smoke exhaust port of the heat exchange chamber.

In an embodiment, the gas appliance comprises a gas water heater or a gas wall-hanging stove.

In the technical scheme provided by the invention, the gas provided by the gas inlet assembly sucks primary air to the first combustion chamber and ignites the primary air; the air inlet assembly sucks secondary air, and the combustion main body burns to generate high-temperature flue gas; after the gas provided by the gas inlet assembly and the smoke returned from the smoke outlet are mixed by the premixer, the mixed gas is injected into the second combustion chamber so that the mixed gas is matched with the high-temperature smoke to generate a entrainment effect, so that the high-temperature smoke is returned, a heat preservation effect can be realized on the second combustion chamber, the temperature in the second combustion chamber is higher than the spontaneous combustion point of the fuel, and the spontaneous combustion of the fuel is realized; and dilution air can be sucked by jet flow entrainment, so that the oxygen concentration in the second combustion chamber is lower than a certain value, uniform combustion is realized, and the aim of high-temperature air combustion is fulfilled.

Drawings

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

FIG. 1 is a schematic front view of an embodiment of a combustor provided by the present invention;

FIG. 2 is an enlarged schematic view of the structure at A in FIG. 1;

FIG. 3 is a schematic longitudinal sectional view of the burner of FIG. 1;

fig. 4 is an enlarged schematic view of fig. 3 at B.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				100	Shell body	122	Air distributing rod
101	First combustion chamber	123	Gas proportional valve
				102	Second combustion chamber	124	Gas flow channel
110	Atmospheric burner	130	Air inlet assembly
				111	Combustion monomer	140	Premixing apparatus
112	Combustion assembly	141	Mixing chamber
				112a	Plate-shaped body	142	Return conduit
112b	Vent port	150	Gas distribution structure
				112c	Guide plate		151	The first chamber
112d	Air supplement port	152	Second chamber
				120	Air inlet assembly	200	Heat exchange chamber
121	Gas pipeline

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.

The invention aims to design a novel burner by utilizing the combustion characteristic of high-temperature air and apply the novel burner to gas equipment, so that the gas equipment can effectively reduce the emission of CO and NOx and reduce the noise of the gas equipment.

The invention provides a burner which is applied to gas equipment and related products and equipment such as a gas wall-mounted boiler and the like which are used for household bathing, heating and the like by using high-temperature hot water generated by gas combustion. Fig. 1 to 4 show an embodiment of a burner according to the present invention.

Referring to fig. 1 to 4, the burner provided by the present invention includes a combustion body, an air intake assembly 120, an air intake assembly 130 and a premixer 140, wherein the combustion body is formed with a first combustion chamber 101 and a second combustion chamber 102 which are sequentially communicated, the combustion body is ignited in the first combustion chamber 101 to heat the temperature in the first combustion chamber 101 to a preset temperature, and the second combustion chamber 102 has a flue gas outlet; the air inlet assembly 120 is used for receiving fuel gas, and the air inlet assembly 120 is communicated with the first combustion chamber 101; the air inlet assembly 130 is used for accessing air to the first combustion chamber 101; the premixer 140 is formed with a mixing cavity 141, and the mixing cavity 141 is respectively communicated with the air intake assembly 120 and the flue gas outlet for mixing, and injects a mixed gas into the second combustion chamber 102, so that high-temperature air combustion is performed in the second combustion chamber 102.

In the technical scheme provided by the invention, the gas provided by the gas inlet component 120 sucks primary air to the first combustion chamber 101 and ignites the primary air; the air intake assembly 130 sucks secondary air, and the combustion main body burns to generate high-temperature flue gas; after the gas provided by the gas inlet assembly 120 and the flue gas flowing back from the flue gas outlet are mixed by the premixer 140, the mixed gas is injected into the second combustion chamber 102, so that the mixed gas and the high-temperature flue gas cooperate to generate a entrainment effect, and the high-temperature flue gas flows back, which can play a role in heat preservation on the second combustion chamber 102, so that the temperature in the second combustion chamber 102 is higher than the spontaneous combustion point of the fuel, and the spontaneous combustion of the fuel is realized; and dilution air can be sucked through jet flow, so that the oxygen concentration in the second combustion chamber 102 is lower than a certain value, uniform combustion is realized, and the purpose of high-temperature air combustion is achieved.

The specific expression of the combustion body is not limited in the present design, but for the sake of understanding, in the following embodiments, the combustion body includes a housing 100 and an atmospheric burner 110, wherein the housing 100 forms the first combustion chamber 101 and the second combustion chamber 102; the atmospheric burner 110 is used for igniting in the first combustion chamber 101 to heat the temperature in the first combustion chamber 101 to a preset temperature.

It is understood that the atmospheric burner 110 includes a combustion unit 111, the combustion unit 111 has a gas flow channel for the combustion gas to pass through, in a specific application, the combustion unit 111 can be accommodated in the first combustion chamber 101, and the gas flow channel of the combustion unit 111 is communicated with the first combustion chamber 101. The air intake assembly 120 provides the gas to the atmospheric burner 110, and when the gas directly enters the gas flow channel or enters the gas flow channel through the first combustion chamber 101, the gas sucks part of the primary air in the indoor environment or in the first combustion chamber 101, and sufficient mixed gas is formed in the gas flow channel, so that the combustion unit 111 can be ignited.

Next, air inlet subassembly 130 includes the convulsions subassembly, and the convulsions subassembly realizes sucking the outside air to first combustion chamber 101 or airflow channel in to the circulation of air accelerates, makes the monomer 111 that burns obtain more and lasting secondary air, realizes the continuous burning of the monomer 111 that burns, can heat the temperature in the first combustion chamber 101 to preset temperature, realizes high temperature preheated air.

The premixer 140 is connected to the external gas and the flue gas flowing back from the flue gas outlet, and injects the mixed gas into the second combustion chamber 102 after the gas is sufficiently mixed to form the mixed gas. Specifically, the premixer 140 may be provided with a nozzle communicating with the second combustion chamber 102, and the purpose of injecting the mixed gas into the second combustion chamber 102 can be achieved by providing a reduction in the flow area from the main structure of the premixer 140 to the nozzle, or by providing an increase in the pressure provided by the main structure of the premixer 140 to the nozzle, thereby achieving a high-speed jet.

After the mixed gas is injected into the second combustion chamber 102, the mixed gas is matched with the high-temperature preheated air in the second combustion chamber 102 to generate a entrainment effect, so that the high-temperature flue gas continuously flows back in the second combustion chamber 102. The circulating reflux of the high-temperature flue gas can play a role in preserving heat of the second combustion chamber 102, so that the temperature in the second combustion chamber 102 is higher than the spontaneous combustion point of the fuel, and the spontaneous combustion of the fuel is realized; the circulation reflux of the high-temperature flue gas can also entrain dilution air through jet flow, so that the concentration of oxygen in the second combustion chamber 102 is lower than a certain value, uniform combustion is realized, and the purpose of high-temperature air combustion is achieved.

It should be noted that, the structure of the above-mentioned burner frame can miniaturize the components for realizing high-temperature air combustion, so that more application space and value are provided, the noise is low, the combustion is sufficient, the pollution of the discharged waste gas is small, when the burner frame is applied to a gas water heater and related products and equipment which are used for household bathing, heating and the like by using high-temperature hot water generated by gas combustion including a gas wall-mounted furnace and the like, the requirements are met, and the effects of sufficient combustion and low pollutant discharge which are not provided by the burner in the existing water heater are also brought.

It can be understood that the target temperature of the high-temperature preheated air cannot be too low, and cannot be lower than 600 ℃, and generally, the target temperature is controlled to be 600-1200 ℃, so that when the high-temperature gas contacts with the fuel gas in the combustion chamber, better automatic combustion is realized, and ignition are not needed any more. The scheme for implementing high-temperature preheating of air can be various, and can be implemented by controlling the heating time, controlling the ratio of fuel gas to air, performing heat preservation, increasing the residence time of high-temperature gas in the second combustion chamber 102, and the like.

In the above, the oxygen concentration in the second combustion chamber 102 needs to be lower than a certain value, and specifically, may be set to be lower than 5% to 10%. The oxygen concentration in the second combustion chamber 102 can be achieved by adjusting the ratio of the fuel gas to the air in the premixer 140, for example, when the fuel gas amount is constant, the oxygen concentration in the second combustion chamber 102 can be adjusted by adjusting the real-time intake air amount in the second combustion chamber 102, thereby achieving the control of the ratio of the fuel gas to the air. The magnitude of the oxygen concentration in the second combustion chamber 102 may be controlled based on the size of the second combustion chamber 102 and the rate of control injection.

In order to achieve the return of the flue gas from the flue gas outlet to the mixing chamber 141, in an embodiment, the premixer 140 includes a housing forming the mixing chamber 141 and a return duct 142 respectively communicating with the mixing chamber 141 and the flue gas outlet. The flue gas discharged from the flue gas outlet includes a part of air, the flue gas flows back to the mixing cavity 141 through the return pipe 142, and is mixed with the fuel gas received by the gas inlet assembly 120 to form a mixed gas, and the mixed gas is injected into the second combustion chamber 102 to form a high-speed jet. Therefore, the residual flue gas can be reasonably recycled, and the resource reutilization can be realized.

The extraction assembly may be provided at a suitable location of the first combustion chamber 101 or the second combustion chamber 102. In one embodiment, the air extraction assembly is disposed on a side of the second combustion chamber 102 away from the first combustion chamber 101. Specifically, the second combustion chamber 102 is generally provided with a flue gas outlet, and the flue gas outlet is generally communicated with the heat exchange chamber 200, and is used for discharging high-temperature flue gas, which flows back in the second combustion chamber 102, to the heat exchange chamber 200, and exchanging heat with tap water passing through the heat exchange chamber 200, so as to obtain hot water. The air draft assembly is arranged at the smoke outlet of the second combustion chamber 102, so that when the air draft assembly works, external air can be sucked into the air flow channel, required secondary air is supplemented to the atmospheric burner 110, and meanwhile, the air draft assembly can drive high-temperature smoke of the second combustion chamber 102 to be discharged into the heat exchange chamber 200, and the heat exchange effect is improved.

Further, in one embodiment, when the air extracting assembly is operated, the extracted air circulates in a first direction in the first combustion chamber 101; the atmospheric burner 110 includes a combustion unit 111 disposed in the first combustion chamber 101, and the combustion unit 111 has an airflow passage through which a mixed gas flows, the airflow passage being disposed to penetrate in the first direction. The direction of the airflow channel is consistent with the flowing direction of the sucked air, so that on one hand, the wind resistance of the sucked air can be reduced, and more air flows through the airflow channel in unit time, which is beneficial to improving the supplementing efficiency of secondary air; on the other hand can reduce the circulation that burning monomer 111 formed the barrier to the suction air to avoid suction air and burning monomer 111 surface to bump, help the amortization to fall and make an uproar.

In view of the above, the atmospheric burner 110 includes a combustion unit 111 having an air flow channel, a combustion assembly 112 provided at an air outlet of the air flow channel, and an ignition device provided in the first combustion chamber 101 and configured to ignite the combustion assembly 112. The combustion assembly 112 is disposed at the air outlet of the airflow channel, so that after the air and the gas are substantially mixed in the airflow channel, the air and the gas are ignited by the ignition device at the combustion assembly 112, and continuous and uniform combustion is realized.

The specific expression of the combustion assembly 112 is not limited in this design, and in one embodiment, the combustion assembly 112 includes a plate-shaped body 112a covering the air outlet of the air flow channel, and a plurality of air vents 112b penetrating in the thickness direction of the plate-shaped body 112 a. The plurality of air vents 112b can allow the mixed gas to pass through and realize the uniform distribution of the mixed gas on the plate surface of the plate-shaped body 112a, thereby facilitating the uniform combustion of the mixed gas.

For convenience of understanding, the outer periphery side of the plate-like body 112a to the center of the plate-like body 112a is defined from the outside to the inside. Furthermore, a connecting plate section is formed by protruding from the outer periphery of the plate-shaped body 112a and toward the direction of the air flow channel, and the connecting plate section extends along the circumferential direction of the plate-shaped body 112a to improve the covering effect of the plate-shaped body 112a on the air outlet of the air flow channel.

Then, in an embodiment, the plate-shaped body 112a is inclined from outside to inside in a direction gradually facing the airflow channel, so that a concave structure recessed toward the airflow channel is formed in the middle of the plate-shaped body 112a, and the concave structure can play a certain role in guiding and gathering the mixed gas flowing out from the airflow channel, thereby preventing the mixed gas from being influenced by the external airflow to diffuse and influence the combustion effect.

Specifically, referring to fig. 4, in an embodiment, the plate-shaped body 112a has two first outer peripheral sides disposed oppositely; the plate-shaped body 112a is inclined from the two first outer peripheral sides to the center in a direction gradually toward the airflow channel, and approximately forms a V-shaped structure, so that the structure of the plate-shaped body 112a is simplified while the mixed gas is gathered to a certain degree, and the processing and forming are easy.

Further, in an embodiment, the combustion assembly 112 further includes two guide plates 112c respectively protruding from two first outer peripheral sides of the plate-shaped body 112a, and the two guide plates 112c extend in directions away from each other in a direction protruding from the plate-shaped body 112 a. The guide plate 112c is arranged to block interference of external airflow on the combustion flame at the plate-shaped body 112a, so that stable combustion is ensured; on the other hand, the mixed gas can be gathered together with the obliquely arranged plate-shaped body 112a to form a conical flame.

It is understood that the guide plate 112c may be disposed as an inclined straight plate, or may be disposed as an arc surface with gradually changing radian, so as to reduce obstruction and interference to the air flow.

In one embodiment, the guide plate 112c has an air supply opening 112d extending therethrough in a thickness direction thereof. The air supply port 112d is used to supply a certain amount of air to the combustion flame at the plate-shaped body 112a, thereby achieving better and more stable combustion. The air supply port 112d may be provided in one or more.

In the above description, the arrangement of the plurality of air vents 112b on the plate-like body 112a and the arrangement of the plurality of air replenishment vents 112d on the guide plate 112c are not limited. The description will be given by taking an example in which the plurality of air vents 112b are arranged on the plate-like body 112a, and the plurality of air vents 112b may be arranged on the plate-like body 112a in a random dispersed manner, in an array, in a radial pattern, in a grid pattern, or the like. The arrangement of the plurality of air supply ports 112d on the guide plate 112c is similar, and will not be described in detail. The specific size and shape of the air vent 112b and the air supplement port 112d are also not limited, and can be set according to specific requirements.

In an embodiment, the burner further comprises a control device and a flame induction device, wherein the control device is electrically connected with the flame induction device and the air draft assembly so as to control the air draft assembly to work when the flame induction device induces the burning main body to be ignited. The flame sensing device is used for detecting the flame of the combustion body to determine whether the atmospheric burner 110 is in a combustion state. The control device may be an independent control unit provided independently of the control system unique to the gas plant, or may be a simple modification of the control system unique to the gas plant. When the air intake assembly 120 is used for introducing gas into the atmospheric burner 110, the gas entrains partial primary air, so that the atmospheric burner 110 is ignited to generate combustion flame; flame induction system is when sensing to burning flame, and send signal to controlling means, controlling means control convulsions subassembly work for under the effect of convulsions subassembly, in time the make-up secondary air realizes atmospheric burner 110's sustained combustion, realizes that high temperature air preheats.

In one embodiment, a gas source is respectively provided for the atmospheric burner 110 and the premixer 140, and an adjusting valve is respectively provided for the atmospheric burner 110 and the premixer 140, and the gas flow rates of the atmospheric burner 110 and the premixer 140 are controlled by respectively adjusting the opening degrees of the two adjusting valves.

Or in another embodiment, the air intake assembly 120 includes a gas conduit 121 and a gas proportional valve 123, the gas conduit 121 includes two gas flow channels 124, one of the two gas flow channels 124 is communicated with the first combustion chamber 101, and the other is communicated with the pre-mixer 140, and the gas proportional valve 123 is used for adjusting the gas flow rate of each gas flow channel 124. The gas inlet of the gas pipeline 121 is used for being communicated to a gas source, the gas outlet of the gas pipeline 121 is respectively communicated with the two gas flow channels 124, and the gas proportional valve 123 can adjust the respective gas flow of the two gas flow channels 124, so that the gas flow in the atmospheric burner 110 and the premixer 140 can be adjusted, and the ratio of gas to air can be adjusted and controlled.

Next, in an embodiment, a plurality of injection ports are arranged at intervals on the side of the second combustion chamber 102;

where the premixer 140 further includes a nozzle, the nozzle may be arranged to be installed at the injection port, or the communication between the nozzle and the second combustion chamber 102 may directly constitute the injection port.

The specific arrangement mode of the plurality of injection ports is not limited, and in specific application, the plurality of injection ports can be arranged at intervals along the circumferential direction of the second combustion chamber 102, so that high-speed jet flow can be performed on high-temperature flue gas in the second combustion chamber 102 from multiple directions, and the circulating reflux of the high-temperature flue gas is enhanced; or after the plurality of injection ports form one injection port group, at least two injection port groups are arranged on two opposite sides of the second combustion chamber 102, so that the airflow is injected oppositely to intensify the convection of the flue gas in the second combustion chamber 102.

The opening orientation of each of the plurality of ejection ports is also not limited. According to actual needs, the opening orientations of the plurality of injection ports may be arranged identically or at least partially differently. In one embodiment, when the plurality of injection ports are arranged at intervals in the circumferential direction of the second combustion chamber 102, the openings of all the injection ports may be arranged to face the central axis of the second combustion chamber 102; alternatively, all the injection ports may be arranged obliquely along the same side of the second combustion chamber 102 in the circumferential direction, so that the airflow injected from the plurality of injection ports is in a spiral shape, and the high-temperature flue gas returning after entrainment is in a spiral shape, which is beneficial to extending the returning path of the high-temperature flue gas, enhancing the circulating and returning effect of the flue gas in the second combustion chamber 102, and realizing good heat preservation in the second combustion chamber 102.

In view of the above, the burner further includes a gas distribution structure 150, and the mixing passage is in one-to-one correspondence with the plurality of injection ports through the gas distribution structure 150. Synchronous and homogeneous jet flow of a plurality of jet ports is realized.

Further, in an embodiment, the air distribution chamber includes a first chamber 151 and a second chamber 152 which are communicated in sequence, an air inlet of the first chamber 151 is communicated with the premixer 140, and an air outlet of the second chamber 152 is communicated with the second combustion chamber 102; wherein the second chamber 152 is arranged in a gradually expanding manner along the gas flowing direction. It will be appreciated that the flow area of the first chamber 151 is smaller than the flow area of the second chamber 152, which helps to increase the flow rate of the gas stream from the premixer 140 into the distribution chamber; the second chamber 152 is the gradually-enlarged setting along the gas flow direction, and the flow area that also is the second chamber 152 is gradually big setting along the gas flow direction for mist is at the circulation in-process in the second chamber 152, and the velocity of flow is gentle gradually and is dispersed gradually, is favorable to the mist that each nozzle erupted even and stable.

Among the plurality of injection ports, several injection ports may form an injection port group, and at least two injection port groups are disposed on two opposite sides of the second combustion chamber 102, wherein, taking the injection port group as an example, two injection port groups are disposed, and two gas distribution structures 150 are disposed corresponding to two opposite sides of the second combustion chamber 102; the pre-mixer 140 is connected to the two gas distribution structures 150 through a connection pipe, so that the purpose that the same pre-mixer 140 simultaneously provides the mixed gas to the two gas distribution structures 150 synchronously is achieved, and the mixed gas ejected from each injection port is ensured to be approximately the same.

The atmospheric burner 110 comprises a plurality of combustion units 111, each combustion unit 111 having a gas flow passage for flowing a mixed gas; the air intake assembly 120 includes a gas pipe 121 and a gas distributing rod 122, and the gas pipe 121 is communicated with a plurality of gas flow channels of the plurality of combustion units 111 through the gas distributing rod 122 in a one-to-one correspondence manner. Through the arrangement of the gas distributing rod 122, the same gas pipeline 121 can simultaneously provide approximately equivalent gas for the plurality of combustion units 111, so that the combustion effects of the plurality of combustion units 111 are substantially the same and consistent.

In addition, the invention also provides a gas device, which can be a gas water heater or a gas wall-mounted furnace, and comprises a heat exchanger and the burner as described above, and of course, the gas device also comprises a main structure, wherein the main structure is internally provided with a heat exchange chamber 200 and a smoke outlet communicated with the heat exchanger, the heat exchanger is arranged in the heat exchange, the burner is provided with a smoke outlet, and the smoke outlet of the burner is communicated with the heat exchange chamber 200. The heat exchanger is connected to an external water source, such as tap water, the high-temperature flue gas entering the heat exchange chamber 200 through the flue gas outlet of the burner carries enough heat to continuously exchange heat with the water in the heat exchanger, so that the temperature of the water is increased to be required, and hot water is prepared. The air draft assembly is arranged at the smoke outlet of the heat exchange chamber 200, and the premixer 140 is connected with the smoke outlet of the heat exchange chamber 200.

It can be understood that the heat exchanger includes the heat exchange tube, and the heat exchange tube passes through heat transfer chamber 200, and the outside water source of one end intercommunication of heat exchange tube, the other end are used for supplying the user to use for when combustor work and convulsions subassembly during operation, the flue gas that the burning produced in the combustion chamber gets into heat transfer chamber 200 in, heat the running water through the heat-conduction between heat exchange tube and the high temperature flue gas, thereby finally make hot water. The specific arrangement manner of the heat exchange tube in the heat exchange chamber 200 is not limited, and for example, the heat exchange tube may be bent for multiple times and then arranged inside the heat exchange chamber 200, or wound around the periphery of the heat exchange chamber 200.

It should be noted that, the detailed structure of the burner in the gas appliance may refer to the above-mentioned embodiment of the burner, and is not described herein again; because the burner is used in the gas equipment, the embodiment of the gas equipment comprises all technical schemes of all embodiments of the burner, and the achieved technical effects are completely the same, which are not described again.

Claims

1. A burner, comprising:

and the premixer is formed with a mixing cavity, the mixing cavity is respectively communicated with the air inlet assembly and the smoke outlet and is used for mixing, and mixed gas is injected into the second combustion chamber, so that high-temperature air combustion is carried out in the second combustion chamber.

2. The burner of claim 1, wherein the premixer includes a housing forming the mixing chamber and a return conduit communicating with the mixing chamber and the flue gas outlet, respectively.

3. The burner of claim 1, wherein a plurality of injection ports are arranged at intervals on the side of the second combustion chamber;

4. The burner of claim 3, wherein the gas distribution structure is provided with a gas distribution cavity, the gas distribution cavity comprises a first chamber and a second chamber which are communicated in sequence, the gas inlet of the first chamber is communicated with the mixing cavity, and the gas outlet of the second chamber is communicated with the second combustion chamber;

5. The burner of claim 4, wherein there are two of said gas distribution structures corresponding to opposite sides of said second combustion chamber;

6. The burner of claim 1, wherein the air intake assembly comprises an air extraction assembly, the air extraction assembly being disposed at the flue gas outlet.

7. The burner of claim 1, wherein the combustion body comprises:

8. The burner of claim 7, wherein the extraction assembly is operable to draw air in a first direction within the first combustion chamber;

9. The burner of claim 7, wherein the atmospheric burner comprises a combustion unit formed with a gas flow channel, a combustion assembly disposed at an outlet of the gas flow channel, and an ignition device disposed in the first combustion chamber for igniting the combustion assembly.

10. The burner of claim 9, wherein the burner assembly includes a plate-shaped body covering the air outlet of the air flow channel, and a plurality of air vents provided through the plate-shaped body in a thickness direction thereof.

11. The burner of claim 10, wherein the plate-like body has two first outer peripheral sides disposed in opposition;

the plate-shaped body is gradually inclined towards the airflow channel from the two first outer peripheral sides to the center of the plate-shaped body.

12. The burner of claim 11, wherein said burner assembly further comprises two guide plates respectively protruded at two first outer peripheral sides of said plate-like body, said two guide plates extending in directions away from each other in a direction protruding from said plate-like body.

13. The burner of claim 12, wherein the guide plate has a supplementary air port extending therethrough in a thickness direction thereof.

14. The burner of claim 13, wherein a plurality of said air ports are arranged in a grid pattern on said plate-like body; and/or the presence of a gas in the gas,

the air supply ports are arranged in a plurality of grids on the guide plate.

15. The burner of claim 1, further comprising a control device and a flame induction device, wherein the control device is electrically connected to the flame induction device and the first exhaust assembly to control the first exhaust assembly to operate when the flame induction device senses the ignition of the combustion body.

16. The burner of claim 7, wherein the atmospheric burner comprises a plurality of combustion units, each of the combustion units having a gas flow passage for flowing a mixed gas;

17. The burner of claim 1, wherein the air intake assembly includes a gas conduit including two gas flow passages, one of the two gas flow passages communicating with the first combustion chamber and the other communicating with the premixer, and a gas proportioning valve for regulating gas flow to each of the gas flow passages.

18. A gas-fired appliance comprising a heat exchanger and a burner as claimed in any one of claims 1 to 17, the heat exchanger producing hot water from heat generated by the burner.

19. The gas-fired apparatus according to claim 18, further comprising a main body formed with a heat exchange chamber communicating with said second combustion chamber, said heat exchange chamber being provided with a smoke exhaust;

the air draft assembly is arranged at the smoke exhaust port of the heat exchange chamber, and the premixer is connected with the smoke exhaust port of the heat exchange chamber.

20. Gas appliance according to any of the claims 18 to 19, characterized in that it comprises a gas water heater or a gas wall-hung stove.