WO2022089616A1

WO2022089616A1 - Combustor and gas equipment

Info

Publication number: WO2022089616A1
Application number: PCT/CN2021/127700
Authority: WO
Inventors: 钱晓林; 梁泽锋
Original assignee: 芜湖美的厨卫电器制造有限公司; 美的集团股份有限公司
Priority date: 2020-10-30
Filing date: 2021-10-29
Publication date: 2022-05-05
Also published as: CN114459028A

Abstract

A combustor and gas equipment. The combustor comprises a combustion main body, a gas inlet component (120), an air suction component (130), and a premixer (140). A first combustion chamber (101) and a second combustion chamber (102) are formed in the combustion main body. The combustion main body is configured to heat the temperature in the first combustion chamber (101) to a preset temperature; the gas inlet component (120) is configured to introduce fuel gas into the first combustion chamber (101); the air suction component (130) is configured to introduce air into the first combustion chamber (101); the premixer (140) is configured to mix the introduced fuel gas and air, and spray the mixed gas to the second combustion chamber (102), so that high temperature air combustion is conducted in the second combustion chamber (102).

Description

Burners and Gas Equipment

This application claims the priority of the Chinese patent application with the application number 202011206871.0 and the invention title "Burner and Gas Equipment" filed with the China Patent Office on October 30, 2020, the entire contents of which are incorporated in the application by reference.

technical field

The present application relates to the technical field of high temperature air combustion, in particular to a burner and gas equipment.

Background technique

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

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

technical problem

The main purpose of this application is to propose a burner and gas equipment with a high temperature air combustion function.

technical solutions

In order to achieve the above purpose, a burner proposed in this application includes:

a combustion body, which is formed with a first combustion chamber and a second combustion chamber communicated in sequence, the combustion body is configured to be ignited in the first combustion chamber and heat the temperature in the first combustion chamber to a preset temperature;

an air intake assembly configured to feed gas into the first combustion chamber;

an extraction assembly configured to access air for the first combustion chamber; and,

The premixer is configured to insert and mix the gas and air, and inject the mixed gas into the second combustion chamber, so that high-temperature air combustion is performed in the second combustion chamber.

Optionally, the air extraction assembly is provided on a side of the second combustion chamber away from the first combustion chamber.

Optionally, the combustion body includes:

a casing forming the first combustion chamber and the second combustion chamber; and,

An atmospheric burner configured to ignite within the first combustion chamber to heat the temperature within the first combustion chamber to a preset temperature.

Optionally, when the air extraction assembly works, the drawn air circulates in the first combustion chamber along a first direction;

The atmospheric burner includes a combustion unit provided in the first combustion chamber, the combustion unit having an air flow passage configured to flow a mixed gas, and the air flow passage is provided penetratingly in the first direction.

Optionally, the atmospheric burner includes a combustion unit formed with an air flow channel, a combustion assembly disposed at an air outlet of the air flow channel, and a combustion assembly disposed in the first combustion chamber and configured to burn the combustion chamber. An ignition device that ignites the component.

Optionally, the combustion assembly includes a plate-shaped body covering the air outlet of the airflow channel, and a plurality of ventilation openings extending through a thickness direction of the plate-shaped body.

Optionally, the plate-shaped body has two first outer peripheral sides arranged oppositely;

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

Optionally, the combustion assembly further includes two guide plates protruding from the two first outer peripheral sides of the plate-shaped body respectively, and the two guide plates are in a protruding direction relative to the plate-shaped body extending away from each other.

Optionally, the guide plate is provided with an air supply port along its thickness direction.

Optionally, a plurality of the ventilation openings are arranged on the plate-shaped body in a grid shape; and/or,

There are a plurality of the air supply ports, and the plurality of the air supply ports are arranged in a grid shape on the guide plate.

Optionally, the burner further includes a control device and a flame sensing device, the control device is electrically connected to the flame sensing device and the air extraction assembly, and is configured to sense the combustion body when the flame sensing device senses the combustion body. When ignited, the ventilation assembly is controlled to work.

Optionally, the atmospheric burner includes a plurality of combustion cells, each of the combustion cells having an air flow channel configured to circulate the mixed gas;

The air intake assembly includes a gas pipeline and an air distribution rod, and the gas pipeline is in one-to-one correspondence with the plurality of air flow channels of the plurality of combustion units through the air distribution rod.

Optionally, the air intake assembly includes a gas pipeline and a gas proportional valve, the gas pipeline includes two gas flow channels, one of the two gas flow channels is communicated with the first combustion chamber, and the other is connected with the other gas flow channels. The premixer is in communication, and the gas proportional valve is configured to adjust the gas flow rate of each of the gas flow passages.

Optionally, the premixer includes a casing and a fan, the casing is formed with an air inlet channel and a mixing channel, and the mixing channel is respectively connected with the air inlet channel and the gas flow channel;

Wherein, the fan is arranged in the air inlet duct or the mixing duct.

Optionally, a plurality of injection ports are arranged at intervals on the side of the second combustion chamber;

The burner further includes a gas distribution structure, and the mixing channel communicates with the plurality of injection ports in a one-to-one correspondence through the gas distribution structure.

Optionally, the air distribution structure has an air distribution chamber, the air distribution chamber includes a first chamber and a second chamber that are connected in sequence, and an air inlet of the first chamber is communicated with the mixing channel, The air outlet of the second chamber communicates with the second combustion chamber;

Wherein, the second chamber is arranged in a gradually expanding manner along the gas flow direction.

Optionally, two gas distribution structures are provided on opposite sides of the second combustion chamber;

The premixer is respectively connected with the two gas distribution structures through connecting pipes.

In addition, in order to practice the above purpose, the present application also provides a gas-fired equipment, comprising a heat exchanger and the above-mentioned burner, wherein the heat exchanger produces hot water by using the heat generated by the burner.

Optionally, the gas equipment further includes a main body, the main body is formed with a heat exchange chamber communicating with the second combustion chamber, and the heat exchange chamber is provided with a smoke exhaust port;

The air extraction assembly is arranged at the smoke exhaust port of the heat exchange chamber.

Optionally, the gas equipment includes a gas water heater or a gas wall-hung boiler.

beneficial effect

In the technical solution provided by this application, the gas provided by the air intake assembly entrains the primary air to the first combustion chamber and is ignited; the exhaust air assembly inhales the secondary air, and the combustion main body burns to generate high-temperature flue gas; the premixer mixes the air and After the gas is fired, the mixed gas is injected into the second combustion chamber, so that the mixed gas and the high-temperature flue gas can cooperate to produce an entrainment effect, so that the high-temperature flue gas can flow back, which can not only play a thermal insulation role in the second combustion chamber, and make the The temperature is higher than the self-ignition point of the fuel to realize the self-ignition of the fuel; the diluting air can also be entrained by the jet, so that the oxygen concentration in the second combustion chamber is lower than a certain value, so as to achieve uniform combustion and achieve the purpose of high-temperature air combustion.

Description of drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained according to the structures shown in these drawings without any creative effort.

1 is a schematic front view of an embodiment of a burner provided by the application;

Fig. 2 is the enlarged structure schematic diagram of A place in Fig. 1;

Fig. 3 is the longitudinal sectional schematic diagram of the burner in Fig. 1;

FIG. 4 is an enlarged schematic view of B in FIG. 3 .

Description of reference numbers:

标号 label	名称 name	标号 label	名称 name
100 100	壳体 case	122 122	分气杆 Air divider
101 101	第一燃烧室 first combustion chamber	123 123	燃气比例阀 Gas proportional valve
102 102	第二燃烧室 second combustion chamber	124 124	燃气流道 Gas runner
110 110	大气式燃烧器 Atmospheric burner	130 130	抽风组件 Exhaust components
111 111	燃烧单体 Combustion monomer	140 140	预混合器 premixer
112 112	气流通道 airflow channel	141 141	机壳 chassis
113 113	燃烧组件 combustion components	142 142	风机 fan
114 114	板状本体 plate body	143 143	进风风道 intake air duct
115 115	通气口 vent	150 150	分气结构 Air distribution structure
116 116	导板 Guides	151 151	第一腔室 first chamber
117 117	补气口 air intake	152 152	第二腔室 second chamber
120 120	进气组件 Air intake assembly	200 200	换热室 heat exchange chamber
121 121	燃气管道 gas pipeline	201 201	容置槽 accommodating slot

The realization, functional characteristics and advantages of the purpose of the present application will be further described with reference to the accompanying drawings in conjunction with the embodiments.

The purpose of this application is to use the characteristics of high temperature air combustion to design a new type of burner and apply it to gas equipment, so that the gas equipment can effectively reduce CO and NOx emissions and reduce the noise of gas equipment.

The present application provides a burner, which is used in gas equipment and related products and equipment including gas wall-hung boilers that use gas combustion to generate high-temperature hot water for domestic bathing and heating. The following is for the convenience of understanding. example. 1 to 4 are embodiments of the burner provided by the application.

Referring to FIGS. 1 to 4 , the burner provided by the present application includes a combustion main body, an air intake assembly 120 , an air extraction assembly 130 and a premixer 140 , wherein the combustion main body is formed with a first combustion chamber 101 and a second combustion chamber 101 that communicate in sequence. Second combustion chamber 102, the combustion main body is used for igniting in the first combustion chamber 101 to heat the temperature in the first combustion chamber 101 to a preset temperature; the intake assembly 120 is used for all The first combustion chamber 101 is connected to gas; the air extraction assembly 130 is used to connect air to the first combustion chamber 101; the premixer 140 is used to connect and mix the The second combustion chamber 102 injects the mixed gas, so that high temperature air combustion is performed in the second combustion chamber 102 .

In the technical solution provided by this application, the gas provided by the air intake assembly 120 entrains the primary air to the first combustion chamber 101 and is ignited; the exhaust air assembly 130 inhales the secondary air, and the combustion main body burns to generate high-temperature flue gas; the premixer 140 After mixing air and gas, the mixed gas is injected into the second combustion chamber 102, so that the mixed gas and the high-temperature flue gas cooperate to produce an entrainment effect, so that the high-temperature flue gas flows back, which can not only play a heat preservation effect on the second combustion chamber 102, The temperature in the second combustion chamber 102 is made higher than the self-ignition point of the fuel, so that the self-ignition of the fuel is realized; the dilution air can also be entrained by the jet, so that the oxygen concentration in the second combustion chamber 102 is lower than a certain value, and uniform combustion is achieved. The purpose of high temperature air combustion.

The specific manifestation of the combustion body is not limited in this design, but for ease of understanding, in the following embodiments, the combustion body includes a casing 100 and an atmospheric burner 110, wherein the casing 100 forms the The first combustion chamber 101 and the second combustion chamber 102; the atmospheric burner 110 is used for ignition in the first combustion chamber 101 to heat the temperature in the first combustion chamber 101 to a preset value temperature.

It can be understood that the atmospheric burner 110 includes a combustion unit 111, and the combustion unit 111 has an airflow passage 112 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 burns The airflow passage 112 of the unit 111 communicates with the first combustion chamber 101 . The air intake assembly 120 provides gas for the atmospheric burner 110. When the gas directly enters the airflow passage 112, or enters the airflow passage 112 through the first combustion chamber 101, it entrains part of the indoor environment or the primary combustion chamber 101. Air, sufficient mixed gas is formed in the airflow channel 112 so that the combustion unit 111 can be ignited.

Next, the air extraction assembly 130 realizes the suction of external air into the first combustion chamber 101 or the airflow channel 112, and accelerates the circulation of the air, so that the combustion unit 111 obtains more and continuous secondary air, and realizes the combustion unit 111. The continuous combustion of the first combustion chamber 101 can heat the temperature in the first combustion chamber 101 to a preset temperature to achieve high-temperature preheating air.

The premixer 140 is respectively connected to external air and external gas, and after fully mixing to form a mixed gas, the mixed gas is injected into the second combustion chamber 102 . Specifically, the premixer 140 may be configured to include a nozzle arranged in communication with the second combustion chamber 102, and the flow area at the nozzle is reduced by arranging the body structure of the premixer 140, or the body structure of the premixer 140 is provided to The purpose of injecting the mixed gas into the second combustion chamber 102 can be achieved by means of increasing the pressure at the nozzle, so as to achieve a high-speed jet.

After the mixed gas is injected into the second combustion chamber 102 , it cooperates with the high-temperature preheated air in the second combustion chamber 102 to generate an entrainment effect, so that the high-temperature flue gas continues to flow back in the second combustion chamber 102 . The circulating backflow of the high-temperature flue gas can maintain the heat preservation effect on the second combustion chamber 102, so that the temperature in the second combustion chamber 102 is higher than the self-ignition point of the fuel, thereby realizing the self-ignition of the fuel; the circulating and back-flowing of the high-temperature flue gas can also pass The jet entrains the dilution air, so that the oxygen concentration in the second combustion chamber 102 is lower than a certain value, so as to achieve uniform combustion and achieve the purpose of high temperature air combustion.

It should be noted that the structure of the above-mentioned burner frame can miniaturize the components that realize high-temperature air combustion, so that it has more application space and value, and in addition, it has low noise, sufficient combustion, and low exhaust gas pollution. It is used in gas water heaters and Including gas-fired wall-hung boilers and other related products and equipment that use gas combustion to generate high-temperature hot water for domestic bathing and heating, it not only meets the requirements, but also brings sufficient and low combustion that the burners in existing water heaters do not have. The effect of pollutant emissions.

It can be understood that the target temperature of the high-temperature preheating air should not be too low, and it should not be lower than 600 degrees Celsius as far as possible. Generally, it is controlled at 600 to 1200 degrees Celsius to ensure better automatic combustion when the high-temperature gas is in contact with the gas in the combustion chamber. It is no longer necessary. Ignite. There are various schemes for realizing high temperature preheating air, for example, it can be realized by controlling the heating time, controlling the ratio of fuel gas and air, maintaining heat preservation, and increasing the residence time of the high temperature gas in the second combustion chamber 102 .

In the above, the oxygen concentration of the second combustion chamber 102 needs to be lower than a certain value, and can be specifically 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 fuel gas to air in the premixer 140. For example, when the amount of fuel gas is constant, the real-time intake air volume in the second combustion chamber 102 can be adjusted. , to adjust the oxygen concentration in the second combustion chamber 102 to control the ratio of fuel gas to air. The size of the oxygen concentration in the second combustion chamber 102 can be controlled according to the size of the second combustion chamber 102 and the speed of the control injection.

The air extraction assembly 130 may be disposed at a suitable position of the first combustion chamber 101 or the second combustion chamber 102 . In one embodiment, the air extraction assembly 130 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 for discharging the high temperature flue gas backflowing from the second combustion chamber 102 to the heat exchange chamber 200 . , exchanging heat for the tap water passing through the heat exchange chamber 200 to produce hot water. The air extraction assembly 130 is arranged at the flue gas outlet of the second combustion chamber 102, so that when the air extraction assembly 130 is working, the outside air can be sucked into the airflow channel 112, and the atmospheric burner 110 can be supplemented with the required secondary At the same time, the air extraction assembly 130 can drive the high-temperature flue gas of the second combustion chamber 102 to be discharged into the heat exchange chamber 200 to improve the heat exchange effect.

Further, in an embodiment, when the air suction assembly 130 is working, the drawn air circulates in the first combustion chamber 101 along a first direction; the atmospheric burner 110 includes a The combustion unit 111 in the combustion chamber 101 has an air flow channel 112 for circulating the mixed gas, and the air flow channel 112 is arranged through the first direction. The direction of the airflow channel 112 is set to be consistent with the flow direction of the drawn air. On the one hand, the wind resistance of the drawn air can be reduced, and more air can flow through the airflow channel 112 in a unit time, which is helpful to improve the secondary air. On the other hand, it can reduce the obstruction of the combustion unit 111 to the circulation of the drawn air, so as to avoid the collision between the drawn air and the outer surface of the combustion unit 111, which is helpful for noise reduction and noise reduction.

In view of the above, the atmospheric burner 110 includes a combustion unit 111 formed with an air flow channel 112 , a combustion component 113 disposed at the air outlet of the air flow channel 112 , and a combustion component 113 disposed in the first combustion chamber 101 and An ignition device for igniting the combustion assembly 113 . The combustion assembly 113 is disposed at the air outlet of the airflow channel 112, so that after the air and gas are substantially mixed in the airflow channel 112, the ignition device ignites the combustion assembly 113 to achieve continuous and uniform combustion.

The specific expression form of the combustion assembly 113 is not limited in this design. In one embodiment, the combustion assembly 113 includes a plate-shaped body 114 covering the air outlet of the airflow channel 112 , and a plate-shaped body 114 along the plate. A plurality of vents 115 are formed through the thickness direction of the body 114 . The plurality of vents 115 can pass the mixed gas, and realize the uniform distribution of the mixed gas on the plate surface of the plate-shaped body 114, thereby facilitating the uniform combustion of the mixed gas.

For ease of understanding, it is defined from the outer peripheral side of the plate-shaped body 114 to the center of the plate-shaped body 114 to be from the outside to the inside. Further, connecting plate segments are protruded outward from the outer peripheral side of the plate-shaped body 114 and toward the direction of the airflow channel 112 , and the connecting plate segments extend along the circumferential direction of the plate-shaped body 114 to improve the effect of the plate-shaped body 114 on the airflow channel. The capping effect of the air outlet of 112.

Next, in an embodiment, the plate-shaped body 114 is inclined and disposed in a direction gradually toward the airflow channel 112 from the outside to the inside, so that a concave structure recessed toward the airflow channel 112 is formed in the middle of the plate-shaped body 114 , and the recessed structure can The mixed gas flowing out of the airflow channel 112 plays a certain guiding and gathering function, so as to prevent the mixed gas from being diffused by the influence of the external air flow and affecting the combustion effect.

Specifically, please refer to FIG. 4 , in one embodiment, the plate-shaped body 114 has two first outer peripheral sides arranged oppositely; the plate-shaped body 114 extends from the two first outer peripheral sides to the center It is inclined gradually toward the direction of the airflow channel 112 , and roughly forms a V-shaped structure, which helps to simplify the structure of the plate-shaped body 114 while gathering the mixed gas to a certain extent, and is easy to process and shape.

Further, in one embodiment, the combustion assembly 113 further includes two guide plates 116 protruding from the two first outer peripheral sides of the plate-shaped body 114 respectively, and the two guide plates 116 are opposite to each other. The protruding direction of the plate-shaped body 114 extends away from each other. The setting of the guide plate 116 can, on the one hand, block the interference of the external air flow to the combustion flame at the plate-shaped body 114 and ensure stable combustion; .

It can be understood that the guide plate 116 can be arranged in an inclined straight plate, or can be arranged in a cambered surface with a gradual radian, so as to reduce the obstruction and interference to the airflow.

In one embodiment, the guide plate 116 is provided with an air supply port 117 along the thickness direction thereof. The air supply port 117 is used to supply a certain amount of air to the combustion flame at the plate-shaped body 114 to achieve better and more stable combustion. The air supply port 117 can be set to one, or set to multiple.

In the above, the arrangement of the plurality of ventilation ports 115 on the plate-shaped body 114 and the arrangement of the plurality of air supply ports 117 on the guide plate 116 are not limited. Taking the arrangement of the plurality of air vents 115 on the plate-shaped body 114 as an example, the plurality of air-vents 115 can be randomly distributed, arranged in an array, arranged in a radial shape or in a grid shape on the plate-shaped body 114 . layout etc. The arrangement of the plurality of air supply ports 117 on the guide plate 116 is similar to that, and will not be repeated here. The specific size and shape of the air vent 115 and the air supply port 117 are also not limited, and can be set according to specific needs.

In one embodiment, the burner further includes a control device and a flame sensing device, and the control device is electrically connected to the flame sensing device and the suction component 130, so that the flame sensing device senses the combustion when the flame sensing device senses the combustion. When the main body is ignited, the ventilation assembly 130 is controlled to work. Wherein, the flame sensing device is used to detect the flame of the combustion body to determine whether the atmospheric burner 110 is in a combustion state. The control device can be an independent control unit set independently from the inherent control system of the gas equipment, or it can directly improve the inherent control system of the gas equipment. When the air intake assembly 120 is connected to gas for the atmospheric burner 110, the gas entrains part of the primary air, so that the atmospheric burner 110 is ignited to generate a combustion flame; when the flame sensing device senses the combustion flame, it sends a signal to the control The control device controls the operation of the air extraction assembly 130, so that under the action of the air extraction assembly 130, secondary air is replenished in time to achieve continuous combustion of the atmospheric burner 110, and to achieve high temperature air preheating.

Referring to FIG. 3 , in one embodiment, the atmospheric burner 110 includes a plurality of combustion units 111 , and each of the combustion units 111 has an air flow passage 112 for circulating the mixed gas; the air intake assembly 120 includes a gas pipe 121 and a gas divider rod 122 , and the gas pipe 121 communicates with the plurality of air flow channels 112 of the plurality of combustion units 111 in a one-to-one correspondence through the gas divider rod 122 . Through the arrangement of the gas splitting rod 122 , the same gas pipeline 121 can provide substantially equivalent gas to the multiple combustion units 111 at the same time, so that the combustion effects of the multiple combustion units 111 are basically the same.

Both the atmospheric burner 110 and the premixer 140 need to be connected to gas. In one embodiment, a gas source can be provided for the atmospheric burner 110 and the premixer 140 respectively, and the atmospheric burner 110 and the premixer 140 can be provided with a gas source respectively. A regulating valve is respectively set at the burner 140, and the gas flow rate of the atmospheric burner 110 and the premixer 140 is controlled by adjusting the opening degrees of the two regulating valves respectively.

Or in another embodiment, the air intake assembly 120 includes a gas pipeline 121 and a gas proportional valve 123, the gas pipeline 121 includes two gas flow passages 124, and one of the two gas flow passages 124 is connected to the other gas flow passages 124. The first combustion chamber 101 communicates with the other, and the other is communicated with the premixer 140 . The gas proportional valve 123 is used to adjust the gas flow rate of each of the gas flow passages 124 . The air inlet of the gas pipeline 121 is used to connect to the gas source, and the gas outlet of the gas pipeline 121 is connected to the two gas flow channels 124 respectively. The gas proportional valve 123 can adjust the respective gas flow rates of the two gas flow channels 124, so that the atmospheric type The gas volume in the burner 110 and the premixer 140 can be adjusted, so that the ratio of gas to air can be adjusted and controllable.

In one embodiment, the premixer 140 includes a casing 141 and a fan 142. The casing 141 is formed with an air inlet duct 143 and a mixing channel. The gas flow passages 124 are respectively connected; wherein, the fan 142 is provided in the air inlet air passage 143 or the mixing passage. The air inlet duct 143 is used to connect external air, the gas flow channel 124 is used to connect external gas, the external air and the external gas are mixed in the mixing channel, and the air outlets of the mixing channel are respectively connected to the second combustion chamber 102 . Since the external air and external gas enter the mixing channel, they still circulate in the form of two airflows to a certain extent, or only part of the airflow is mixed. Therefore, the fan 142 is arranged at the mixing channel to pass the air in the fan 142. The rotation of the blade disturbs the two airflows in the mixing channel, which is equivalent to fully dispersing the outside air and the outside gas, so as to realize the full mixing of the outside air and the outside gas. In addition, the rotation of the fan blades in the fan 142 can also drive the circulation of the gas in the mixing channel, and accelerate the entry of the mixed gas into the second combustion chamber 102, thereby helping to improve the work of the burner to a certain extent. efficiency. However, arranging the fan 142 at the air inlet duct 143 can realize the adjustment of the air intake in the second combustion chamber 102 , which is also beneficial to the adjustable and controllable ratio of gas to air in the second combustion chamber 102 .

Next, in an embodiment, the side of the second combustion chamber 102 is provided with a plurality of injection ports at intervals; wherein, when the premixer 140 further includes a nozzle, the nozzle can be arranged to be installed at the injection port , or it is arranged that the communication between the nozzle and the second combustion chamber 102 directly constitutes the injection port.

The specific arrangement of the plurality of injection ports is not limited. In specific applications, the plurality of injection ports may be spaced along the circumferential direction of the second combustion chamber 102, so that the high-temperature smoke in the second combustion chamber 102 can be monitored from multiple directions. The high-speed jet of the gas is carried out to enhance the circulation and return of the high-temperature flue gas; or, after several injection ports form an injection port group, at least two injection port components are arranged on opposite sides of the second combustion chamber 102, so that the airflow is jetted toward each other and intensified Flue gas convection in the second combustion chamber 102 .

Among the multiple injection ports, the opening direction of each injection port is also not limited. According to actual needs, the opening orientations of the plurality of injection ports can be set in the same way, or set at least partially different. In one embodiment, when a plurality of injection ports are arranged at intervals along the circumferential direction of the second combustion chamber 102, the openings of all injection ports may be set to face the central axis of the second combustion chamber 102; The injection ports are inclined along the same side of the circumferential direction of the second combustion chamber 102, so that the airflow injected from the plurality of injection ports is in a vortex shape, so that the high temperature flue gas flowing back after entrainment is roughly in a vortex shape, This helps to extend the return path of the high temperature flue gas, enhances the circulation return effect of the flue gas in the second combustion chamber 102 , and achieves good heat preservation in the second combustion chamber 102 .

In view of the above, the burner further includes an air distribution structure 150 , and the mixing channel communicates with the plurality of injection ports in a one-to-one correspondence through the air distribution structure 150 . Enables simultaneous, homogeneous jets of multiple jets.

Further, in one embodiment, the air distribution chamber includes a first chamber 151 and a second chamber 152 that are communicated in sequence, and the air inlet of the first chamber 151 is communicated with the premixer 140 , The gas outlet of the second chamber 152 is communicated with the second combustion chamber 102 ; wherein, the second chamber 152 is arranged to be gradually expanded along the gas flow direction. It can be understood that the flow area of the first chamber 151 is smaller than that of the second chamber 152, which helps to speed up the flow rate of the air flow from the premixer 140 into the air distribution chamber; Gradually expanding, that is, the flow area of the second chamber 152 is gradually increased along the gas flow direction, so that the flow velocity of the mixed gas in the second chamber 152 is gradually gentle and gradually dispersed, which is beneficial to each The mixed gas sprayed by the nozzle is uniform and stable.

Among the multiple injection ports, several injection ports may form an injection port group, and at least two injection port groups are arranged on opposite sides of the second combustion chamber 102 . There are two gas structures 150 corresponding to two opposite sides of the second combustion chamber 102 ; the premixer 140 is connected to the two gas distribution structures 150 through a connecting pipe, so that the same premixer 140 can simultaneously The purpose of providing the mixed gas synchronously by the two gas distribution structures 150 ensures that the mixed gas injected by each injection port is approximately the same.

In addition, the present application also provides a gas equipment. The gas equipment may be a gas water heater or a gas wall-hung boiler. The gas equipment includes a heat exchanger and the above-mentioned burner. Of course, the gas equipment also includes a main structure, and the main structure is provided with There is a heat exchange chamber 200 and a smoke exhaust port communicating with the heat exchanger, the heat exchanger is arranged in the heat exchange, the burner has a flue gas outlet, and the flue gas outlet of the burner communicates with the heat exchange chamber 200 . The heat exchanger is connected to an external water source, such as tap water, and 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 for the water in the heat exchanger, so that the temperature of the water rises to Hot water is produced if required. The air extraction assembly 130 is disposed at the exhaust port of the heat exchange chamber 200 .

Specifically, an accommodating groove 201 can be concavely formed on the main body adjacent to the smoke exhaust port, and the air extraction assembly 130 is limited in the accommodating groove 201 to reduce the space occupied by the air extraction assembly 130 and ensure that the air extraction assembly 130 is located on the main body. installation is stable.

It can be understood that the heat exchanger includes a heat exchange tube, and the heat exchange tube passes through the heat exchange chamber 200. One end of the heat exchange tube is connected to an external water source, and the other end is used for the user, so that when the burner is working and the air extraction assembly 130 is working, the combustion The flue gas generated by the indoor combustion enters the heat exchange chamber 200, and the tap water is heated through the heat conduction between the heat exchange tube and the high-temperature flue gas, thereby finally producing hot water. The specific arrangement of the heat exchange tubes in the heat exchange chamber 200 is not limited.

Claims

A burner comprising:

a combustion body, which is formed with a first combustion chamber and a second combustion chamber communicated in sequence, the combustion body is configured to be ignited in the first combustion chamber and heat the temperature in the first combustion chamber to a preset temperature;

an air intake assembly configured to feed gas into the first combustion chamber;

an extraction assembly configured to access air for the first combustion chamber; and,

The premixer is configured to insert gas and air and mix them, and inject the mixed gas into the second combustion chamber, so that high temperature air combustion is carried out in the second combustion chamber.
The burner according to claim 1, wherein the air suction assembly is provided on a side of the second combustion chamber away from the first combustion chamber.
The burner of claim 1, wherein the combustion body comprises:

a casing forming the first combustion chamber and the second combustion chamber; and,

An atmospheric burner configured to ignite within the first combustion chamber and heat the temperature within the first combustion chamber to a preset temperature.
The burner according to claim 3, wherein when the air suction assembly works, the drawn air circulates in the first combustion chamber along a first direction;

The atmospheric burner includes a combustion unit provided in the first combustion chamber, the combustion unit having an air flow passage configured to flow a mixed gas, and the air flow passage is provided penetratingly in the first direction.
The burner of claim 3, wherein the atmospheric burner comprises a combustion unit formed with an air flow channel, a combustion assembly disposed at an air outlet of the air flow channel, and a combustion component disposed in the first combustion chamber and is configured as an ignition device for igniting the combustion assembly.
The burner according to claim 5, wherein the combustion assembly comprises a plate-shaped body covering the air outlet of the airflow channel, and a plurality of air vents extending through the thickness direction of the plate-shaped body .
The burner of claim 6, wherein the plate-like body has two first outer peripheral sides disposed oppositely;

The plate-shaped body is inclined from the two first outer peripheral sides to the center in a direction gradually facing the airflow channel.
The burner of claim 7, wherein the combustion assembly further comprises two guide plates protruding at the two first outer peripheral sides of the plate-shaped body, respectively, and the two guide plates are opposite to each other. The protruding direction of the plate-shaped body extends away from each other.
The burner according to claim 8, wherein the guide plate is provided with a supplementary air port along the thickness direction thereof.
The burner of claim 9, wherein a plurality of the vents are arranged in a grid on the plate-like body; and/or,

There are a plurality of the air supply ports, and the plurality of the air supply ports are arranged in a grid shape on the guide plate.
The burner of claim 1, wherein the burner further comprises a control device and a flame sensing device, the control device is electrically connected to the flame sensing device and the air extraction assembly, and is configured to When the induction device senses that the combustion body is ignited, the air extraction assembly is controlled to work.
4. The combustor of claim 3, wherein the atmospheric combustor includes a plurality of combustion cells, each of the combustion cells having a gas flow passage configured to flow a mixture;

The air intake assembly includes a gas pipeline and an air distribution rod, and the gas pipeline is in one-to-one correspondence with the plurality of air flow channels of the plurality of combustion units through the air distribution rod.
The burner of claim 1, wherein the air intake assembly comprises a gas pipeline and a gas proportional valve, the gas pipeline comprises two gas flow passages, and one of the two gas flow passages is connected to the first gas flow passage. The combustion chamber is in communication, the other is in communication with the premixer, and the gas proportional valve is configured to adjust the gas flow rate of each of the gas flow passages.
The burner according to claim 13, wherein the premixer comprises a casing and a fan, the casing is formed with an air inlet duct and a mixing passage, the mixing passage is connected with the air inlet duct and the fan. The gas flow channels are respectively connected;

Wherein, the fan is arranged in the air inlet duct or the mixing duct.
The burner of claim 14, wherein a plurality of injection ports are spaced apart on the side of the second combustion chamber;

The burner further includes a gas distribution structure, and the mixing channel communicates with the plurality of injection ports in a one-to-one correspondence through the gas distribution structure.
The burner according to claim 15, wherein the air distribution structure has an air distribution chamber, the air distribution chamber comprises a first chamber and a second chamber which are communicated in sequence, and the intake air of the first chamber is the port communicates with the mixing channel, and the air outlet of the second chamber communicates with the second combustion chamber;

Wherein, the second chamber is arranged in a gradually expanding manner along the gas flow direction.
The burner as claimed in claim 15, wherein two air distribution structures are provided corresponding to two opposite sides of the second combustion chamber;

The premixer is respectively connected with the two gas distribution structures through connecting pipes.
A gas-fired equipment comprising a heat exchanger and the burner according to any one of claims 1 to 17, the heat exchanger producing hot water by the heat generated by the burner.
The gas equipment according to claim 18, wherein the gas equipment further comprises a main body, the main body is formed with a heat exchange chamber communicating with the second combustion chamber, the heat exchange chamber is provided with a smoke exhaust port;

The air extraction assembly is arranged at the smoke exhaust port of the heat exchange chamber.
The gas appliance according to any one of claims 18 to 19, wherein the gas appliance comprises a gas water heater or a gas wall-hung boiler.