WO2023274381A1

WO2023274381A1 - Combustor assembly and gas water heater device

Info

Publication number: WO2023274381A1
Application number: PCT/CN2022/103047
Authority: WO
Inventors: 李鑫; 陆祖安; 梁泽锋; 钱晓林
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: 2021-06-30
Filing date: 2022-06-30
Publication date: 2023-01-05

Abstract

A combustor assembly and a gas water heater device. The combustor assembly comprises: a combustion body (100) having a first combustion chamber (20) and a second combustion chamber (30) that are sequentially communicated; a pre-mixer (200) for transferring a mixed gas to the first combustion chamber (20) and the second combustion chamber (30); and an air inlet assembly (300) having an air inlet (31a), a first air outlet (31b), and a second air outlet (31c), the air inlet (31a) of the air inlet assembly (300) being connected to air, the first air outlet (31b) of the air inlet assembly (300) being communicated with an air inlet of the pre-mixer (200), and the second air outlet (31c) of the air inlet assembly (300) being communicated with the first combustion chamber (20), wherein the air inlet assembly (300) is configured to transfer air to the pre-mixer (200) and the first combustion chamber (20), and can control the amount of an airflow transferred to the first combustion chamber (20).

Description

Burner components and gas hot water equipment

This application claims the priority of the Chinese patent application with the application numbers 202110754658.1, 202121507477.0, 202110754539.6, 202121505420.7 on June 30, 2021, and the application name is "Burner Assembly and Gas Hot Water Equipment", which is hereby incorporated by reference in its entirety .

technical field

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

Background technique

High temperature air combustion (high temperature air combustion) is called "mild and deep hypoxic dilution combustion", referred to as soft combustion, which is a new type of combustion, also known as MILD combustion. The main characteristics of this combustion are: the chemical reaction mainly occurs in a high-temperature and low-oxygen environment, the temperature of the reactants is higher than its autoignition temperature, and the maximum temperature rise during the combustion process is lower than its autoignition temperature, and the oxygen volume fraction is diluted to the extreme by the combustion products. Low concentration, usually 3% to 10%. Compared with conventional combustion, in this combustion state, the pyrolysis of fuel is suppressed, the flame thickness becomes thicker, and the flame front disappears, so that the temperature of the entire furnace is very uniform during this combustion, and pollutants NOx and CO are emitted significantly reduced.

Although high-temperature air combustion has the above-mentioned many advantages, at present, it is difficult to meet the combustion conditions and produce better combustion effects in gas-fired hot water equipment.

application content

The main purpose of this application is to propose a burner assembly and gas-fired water heating equipment, aiming at reducing the emission of pollutants (CO and NOx) and reducing the noise of the gas-fired water heating equipment.

In order to achieve the above purpose, the present application proposes a burner assembly, which includes:

a combustion body, the combustion body has a first combustion chamber and a second combustion chamber connected in sequence;

a pre-mixer for delivering mixed gas to the first combustion chamber and the second combustion chamber; and,

The intake assembly has an air intake, a first air outlet and a second air outlet, the air intake of the intake assembly receives air, the first air outlet of the intake assembly is connected to the pre-mixer The air intake port of the air intake assembly communicates with the second air outlet of the air intake assembly and the first combustion chamber; wherein,

The intake assembly is used to deliver air to the pre-mixer and the first combustion chamber, and can control the flow rate of air delivered to the first combustion chamber.

Optionally, the air intake assembly includes:

an air pipeline communicating with the air inlet, the first air outlet and the second air outlet;

A first air flow adjustment device is arranged on the air pipeline, and the first air flow adjustment device is used to adjust the air flow output to the pre-mixer and the first combustion chamber.

Optionally, the first air flow regulating device is an air flow valve, and the air flow valve is arranged in series between the first air outlet and the pre-mixer;

And/or, the air flow valve is arranged in series between the second air outlet and the first combustion chamber.

Optionally, the premixer includes:

Air inlet and gas inlet;

A Venturi tube, the first air inlet of the Venturi tube communicates with the first air outlet of the first air flow regulating device, and the second air inlet of the Venturi tube communicates with the gas inlet;

A mixing chamber, the mixing chamber communicates with the Venturi tube and the first combustion chamber and the second combustion chamber.

Optionally, the air intake assembly also includes:

A fan, the fan is arranged in series between the air inlet and the Venturi tube.

Optionally, the burner assembly also includes:

A splitter component is arranged between the pre-mixer and the first combustion chamber, and the splitter component is used to divide the airflow of the pre-mixer into the first combustor and the second combustor respectively. Combustion chamber delivery.

Optionally, the combustion body includes:

a combustion housing formed with said first and second combustion chambers; and

an air intake casing, the air intake casing is covered on one side of the combustion casing, and is enclosed with the combustion casing to form the mixing chamber;

The combustion casing is provided with a first air inlet connecting the mixing chamber and the first combustion chamber and a second air inlet connecting the mixing chamber and the second combustion chamber.

Optionally, the burner assembly also includes:

A gas valve, the gas valve is arranged between the gas inlet and the Venturi tube.

Optionally, the number of gas channels formed between the second air outlet of the first air flow regulating device and the first combustion chamber is multiple.

Optionally, the first combustion chamber is a preheating combustion chamber, and the second combustion chamber is a high-temperature air combustion chamber.

Optionally, the burner assembly also includes:

An electric control assembly, the electric control assembly is electrically connected to the air intake assembly, and is used to control the air intake assembly to deliver air to the premixer and the first combustion chamber respectively, and to control the delivery to the first combustion chamber The air flow rate of the chamber is such that the mixed gas and air are heated to a preset target temperature in the first combustion chamber and then delivered to the second combustion chamber for high-temperature air combustion.

The present application also proposes a gas-fired water heater, including the above-mentioned burner assembly.

Optionally, the gas hot water equipment also includes:

One end of the heat exchanger is connected to the cold water inlet pipe, and the other end is connected to the hot water outlet pipe. The heat exchanger is used to absorb the heat generated by the combustion of the first combustion chamber and the second combustion chamber of the burner assembly and Exchange the absorbed heat with the water inside the heat exchanger.

In this application, the burner assembly sets the air intake assembly so that under the action of the air intake assembly on the air split, the output air gas is divided into at least two gas flow paths for output, and one path is output to the pre-mixer so that a part of the gas and air are mixed and then enter the first The first combustion chamber and the second combustion chamber, the other part of the gas is only input to the first combustion chamber, the mixed gas and the air output from the intake assembly form high-temperature flue gas after combustion in the first combustion chamber, and the high-temperature flue gas formed by combustion in the first combustion chamber The flue gas is entrained by the high-speed mixed gas injected into the second combustion chamber, so that after the gas injected into the second combustion chamber is diluted with the preheated high-temperature air, high-temperature air combustion is finally realized, reducing the cost of gas-fired hot water equipment. CO and NOx emissions. In this application, the air intake assembly is used to complete high-temperature air combustion. After the mixed gas is properly distributed to the two-stage combustion chamber, the intake assembly can also output another way of air to the first combustion chamber, which can be used under a certain air-fuel ratio. More air is preheated in the first combustion chamber, which can increase the excess air ratio of the first combustion chamber, that is, more air can participate in the combustion of the first combustion chamber and be directly heated, which is beneficial to improve the preheating effect. It makes it easier for the water heater to enter the high-temperature air combustion state, which is beneficial to achieve lower NOx and CO emissions.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to the structures shown in these drawings without creative effort.

Fig. 1 is the structural representation of an embodiment of the burner assembly of the present application;

Fig. 2 is a schematic structural view of another embodiment of the burner assembly of the present application;

Fig. 3 is a functional module schematic diagram of an embodiment of the burner assembly of the present application;

Fig. 4 is a functional module schematic diagram of another embodiment of the burner assembly of the present application;

Fig. 5 is a schematic diagram of a partially exploded structure of the burner in Fig. 1;

Fig. 6 is a schematic diagram of a partially exploded structure of the frame part in Fig. 1;

Fig. 7 is a schematic diagram of the gas flow of an embodiment of the burner assembly of the present application;

Fig. 8 is a schematic structural view of another embodiment of the burner assembly of the present application;

Fig. 9 is a schematic structural view of another embodiment of the burner assembly of the present application;

Fig. 10 is a schematic structural view of another embodiment of the burner assembly of the present application;

Fig. 11 is a schematic structural view of another embodiment of the burner assembly of the present application;

Fig. 12 is a schematic diagram of functional modules of another embodiment of the new burner assembly of the present application;

Fig. 13 is a schematic diagram of functional modules of another embodiment of the new burner assembly of the present application.

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

Explanation of reference numbers:

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

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

In order to form MILD combustion in the combustion chamber of the water heater, it is the key to preheat the MILD intake air and increase the speed of the MILD intake air. Therefore, how to distribute air between the two combustion chambers has become a research direction for realizing high-temperature air combustion.

This application proposes a burner assembly, which is suitable for gas hot water equipment and related products and equipment including gas wall-hung boilers that use gas combustion to generate high-temperature hot water for family bathing and heating. Take hot water equipment as an example.

Referring to Figures 1 to 7, in an embodiment of the present application, the burner assembly includes:

A combustion body 100, the combustion body 100 has a first combustion chamber 20 and a second combustion chamber 30 connected in sequence;

A pre-mixer 200, the pre-mixer 200 is used to deliver mixed gas to the first combustion chamber 20 and the second combustion chamber 30; and,

The air intake assembly 300 has an air inlet 31a, a first air outlet 31b and a second air outlet 31c, the air inlet 31a of the air intake assembly 300 receives air, the first air of the air intake assembly 300 The outlet 31b communicates with the air inlet 31a of the premixer 200, and the second air outlet 31c of the air intake assembly 300 communicates with the first combustion chamber 20; wherein,

The intake assembly 300 is used to deliver air to the pre-mixer 200 and the first combustion chamber 20 , and can control the flow rate of the air delivered to the first combustion chamber 20 .

It can be understood that the main characteristics of high-temperature air combustion are: the chemical reaction needs to occur in a high-temperature and low-oxygen environment, the temperature of the reactants is higher than its auto-ignition temperature, and the maximum temperature rise during the combustion process is lower than its auto-ignition temperature, the oxygen volume fraction Diluted to very low concentrations by combustion products. Compared with conventional combustion, in this combustion state, the pyrolysis of fuel is inhibited, the flame thickness becomes thicker, and the flame front disappears, so that the temperature in the entire furnace is very uniform, the combustion peak temperature is low and the noise is extremely small, and Pollutant NOx and CO emissions are greatly reduced. However, certain conditions are required to achieve high-temperature air combustion: it is necessary to ensure that the oxygen concentration in most areas of the furnace is lower than a certain value, generally lower than 5% to 10%, to ensure that the gas is fully decomposed and burns evenly, and the temperature must be Sustains spontaneous combustion above the self-ignition point of the fuel. In addition, the following conditions must be met. High-temperature preheating air combined with high-speed jets is the main way to achieve high-temperature air combustion; entraining high-temperature flue gas and diluting the combustion air jet is the key to maintaining high-temperature air combustion. The two burners achieve reasonable distribution of gas and achieve the purpose of stable high-temperature air combustion.

The combustion main body 100 includes a shell, and the shell is formed with a first combustion chamber 20 and a second combustion chamber 30. In this embodiment, the shape of the combustion main body 100 shell can be square, cylindrical, etc., and can be customized according to actual needs. Selection and design are not specifically limited here. There is also a smoke exhaust port on the shell. When the gas burns at high temperature in the second combustion chamber 30, the heat after combustion is discharged through the smoke exhaust port, and then it can exchange heat with the heat exchanger of the gas water heating equipment to Realize making hot water. Due to the upward flow of the flue gas, the second combustion chamber 30 can also be located in the upper half of the entire burner assembly 100 , which is more conducive to the exhaust of the flue gas. And in order to further increase the smoke exhaust rate, the upper end of the combustion body 100 is opened to form a smoke exhaust port. The gas hot water equipment also includes a preheating burner installed in the first combustion chamber 20; a heat exchanger located between the smoke outlet and the second combustion chamber 30; the burner assembly also includes an electric control The equipment also includes a water inlet pipe for introducing water into the gas hot water equipment, a hot water outlet pipe for providing hot water to the outside, a smoke exhaust pipe connected to the smoke exhaust port, and a gas inlet pipeline for connecting the gas and intake valve. Among them, the preheating burner is used to heat the gas in the MILD combustion chamber. The preheating burner can adopt a honeycomb structure that can effectively prevent flashback during combustion. For example, the gas hot water equipment also includes an igniter, which is used to ignite the gas injected from the preheating burner. The gas water heating equipment also includes an electric control component 500, which is used to control the combustion work of the preheating burner when the gas water heating equipment is started, and the gas and air entering the first combustion chamber 20 are ignited by the preheating burner. Combusting the mixed gas mixed with gas and air heats the air in the first combustion chamber 20 to form high-temperature flue gas. It can be understood that, by controlling the heating temperature, the air in the first combustion chamber 20 can be heated to the target temperature, that is, the above-mentioned preset temperature, so that high-temperature preheating of the air is realized. After the high-temperature preheated gas is sent into the second combustion chamber 30 , gas is injected into the second combustion chamber 30 , the gas is combined with the high-temperature gas, and the high-temperature gas ignites the gas to realize MILD combustion in the second combustion chamber 30 . Wherein, the first combustion chamber 20 is a preheating combustion chamber, and the second combustion chamber 30 is a high-temperature air combustion chamber.

When performing preheating combustion and high-temperature air combustion, it is necessary to provide air and gas to the first combustion chamber 20 and the second combustion chamber 30 respectively. In order to improve the combustion efficiency of the burner assembly, one of the embodiments of the present application is for the first When the combustion chamber 20 and the second combustion chamber 30 provide air and gas, the air and gas are mixed first. For example, this solution is applied to a fully premixed gas hot water equipment, and a fully premixed burner assembly is installed in the first combustion chamber. , the blower 330 is used to inhale the air, mix it with the gas, and then inject the gas-air mixture into the first combustion chamber 20 and the second combustion chamber 30 .

Another embodiment of this application is to provide unmixed gas through different pipelines, which is applied in the forced-pump gas hot water equipment, by injecting the gas into the air, and then spraying it into the first combustion chamber 20 and the second combustion chamber 30, the strong drum type can be inhaled by the fan 330211, and then sprayed into the combustion chamber respectively. The above-mentioned ways of supplying air and gas to the first combustion chamber 20 and the second combustion chamber 30 are mostly realized through pipelines. Therefore, in specific application embodiments, control valves installed on each pipeline, such as electromagnetic valves, are used to control the flow of pipelines. The gas and air flow rates are used to distribute the gas and air flowing into the first combustion chamber 20 and the second combustion chamber 30 . In this embodiment, the gas delivered to the first combustion chamber 20 and the second combustion chamber 30 is an example for illustration. The pre-mixer 200 has a gas inlet and an air inlet. The pre-mixer 200 connects the gas and air The air output from the intake assembly 300 is mixed and then output to the first combustion chamber 20 and the second combustion chamber 30 to complete preheating combustion and high-temperature air combustion.

In this implementation, the intake assembly 300 is provided so that during the operation of the burner assembly, the intake assembly 300 divides the incoming air into two parts, so as to deliver air to the pre-mixer 200 and the first combustion chamber 2030 respectively, specifically , the air intake assembly 300 sends a part of air to the pre-mixer 200, so that the pre-mixer 200 mixes the incoming gas and air, and then sends the mixed gas to the first combustion chamber 20 and the second combustion chamber 30, the air intake assembly 300 A further part of the air is then fed to the first combustion chamber 20 . In this way, when the gas is delivered to the first combustion chamber 20, the preheating of the gas and all the air required for high-temperature air combustion is completed, so that when the air is injected into the first combustion chamber 2030 through the air intake assembly 300, more A large amount of air is preheated in the first combustion chamber 20 to form high-temperature gas, so that the excess air of the high-temperature gas is relatively high, which is enough to ignite the gas. And form the entrainment effect in the second combustion chamber 30, and form the injection combustion zone and the flue gas recirculation zone in the second combustion chamber 30, make part of the high-temperature flue gas (rich in N2 and CO2 exhaust gas) in the second combustion chamber 30 internal loops to dilute the reactants. Air is added to the first combustion chamber 20 in two ways through the air intake assembly 300, one of which is directly fed into the air through the air intake assembly 300, and the other is pre-mixed with the gas through the pre-mixer 200 and then passed into the first combustion chamber 20 and the second combustion chamber 30, and then through the first combustion chamber 20, most of the air required for preheating combustion and high-temperature air combustion is preheated. When the mixed gas is passed into the second combustion chamber 30, the air in the preheated mixed gas is fully diluted by the mixed gas passed into the second combustion chamber 30, forming a lower oxygen concentration, reducing the combustion reaction speed, and maintaining The higher temperature of the second combustion chamber 30 ensures that the temperature is higher than the self-ignition point of the fuel to realize self-ignition, thereby realizing high-temperature air combustion.

It should be noted that the target temperature of the high-temperature preheating air should not be too low, try not to be lower than 600 degrees Celsius, generally controlled at 600 to 1200 degrees Celsius can ensure that when the high-temperature gas contacts the gas in the second combustion chamber 30, a better Automatic combustion, no longer need to ignite to start ignition. Among them, the target temperature can be achieved by controlling the heating time, controlling the gas-air ratio, keeping warm, increasing the residence time of the high-temperature gas in the first combustion chamber 20 and other methods. The gas injection speed and gas flow rate delivered by the air intake assembly 300 to the second combustion chamber 30 can be adjusted according to demand, specifically according to the preset temperature, ambient temperature, water inlet flow rate, water outlet temperature, ambient pressure, etc., and the adjusted ratio And the process can be predetermined and set by experiment.

It can be understood that when the gas and air are mixed first, it can be realized by using the pre-mixer 200, and part of the mixed gas flow enters the first combustion chamber 20 for preheating combustion; the other part of the mixed gas is injected into the second combustion chamber. The combustion chamber 30 performs high-temperature air combustion. Since the mixed gas containing gas and air is provided by the pre-mixer 200, the preheating burner ignites and burns the mixed gas and the air delivered by the intake assembly 300, realizing high-temperature preheated air, and delivering gas to the second combustion chamber 30 When mixed with air, more air can be preheated in the first combustion chamber 20, thereby generating an entrainment effect in the second combustion chamber 30, causing high-temperature flue gas to flow back. Due to the self-point of the fuel, the gas in the combustion chamber can spontaneously ignite. On the other hand, the dilute air is entrained by the jet, so that the oxygen concentration is lower than a certain value, and uniform combustion is realized. In this way, high-temperature air combustion occurs in the combustion chamber, and MILD combustion can be achieved. Requirements, reduce CO and NOx emissions. In order to achieve better preheating of air and gas, different excess air coefficients, that is, air excess coefficients, can be set for the first combustion chamber 20 and the second combustion chamber 30. The combustion chamber 20 provides air, while the gas flowing to the first combustion chamber 20 and the second combustion chamber 30 is all provided through the pre-mixer 200, so that more air can be preheated by the preheating burner in the first combustion chamber 20 That is, the excess air ratio of the first combustion chamber 20 is higher than that of the second combustion chamber 30, so that more air participates in the combustion of the first combustion chamber 20 and is directly heated, which can improve the preheating effect. The technical solution of this embodiment is conducive to simultaneously achieving the above two conditions required for realizing MILD combustion, and successfully realizing high-temperature air combustion. Moreover, the structure of the burner component 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. Water equipment and related products and equipment, including gas wall-hung boilers, which use gas combustion to generate high-temperature hot water for family bathing and heating, not only meet the requirements, but also bring about advantages that the burner components of existing water heaters do not have. The effect of complete combustion and low pollutant emission.

In this embodiment, the air intake assembly 300 is set so that under the action of the air intake assembly 300 on air splitting, the output air gas is divided into at least two gas flow paths for output, and one path is output to the pre-mixer 200 so that a part of the gas and air are mixed and then enter The first combustion chamber 20 and the second combustion chamber 30, the other part of the air is only input into the first combustion chamber 20, the mixed gas and the air output from the intake assembly 300 form high-temperature smoke after combustion in the first combustion chamber 20, in the first After the high-temperature flue gas formed by combustion in the combustion chamber 20 enters the second combustion chamber 30, high-temperature air combustion is realized in the second combustion chamber 30, reducing CO and NOx emissions from gas-fired hot water equipment.

In this application, the air intake assembly 300 is used to complete high-temperature air combustion. After the mixed gas is properly distributed to the two-stage combustion chambers, the air intake assembly 300 can also output another way of air to the first combustion chamber 20, which can be used under a certain air-fuel ratio. In this way, more air is preheated in the first combustion chamber 20, thereby increasing the excess air ratio of the first combustion chamber 20, that is, more air participates in the combustion of the first combustion chamber 20 and is directly heated. It is conducive to improving the preheating effect, making it easier for the water heater to enter the high-temperature air combustion state, and is conducive to achieving lower NOx and CO emissions.

Referring to Fig. 2, in one embodiment, the air intake assembly 300 includes:

an air pipeline 310, communicating with the air inlet 31a, the first air outlet 31b and the second air outlet 31c;

The first air flow adjustment device 320 is disposed on the air pipeline 310 , and the first air flow adjustment device 320 is used to adjust the air flow output to the pre-mixer 200 and the first combustion chamber 20 .

In this embodiment, the pre-mixer 200 and the air intake assembly 300 are connected through pipelines, and a gas passage is formed in the combustion body 100, and the mixing passage is connected with the pre-mixer 200, the gas passage and the air pipe in turn, and the first gas The flow regulating device can regulate the gas flow output to the pre-mixer 200 and the second combustion chamber 30 . Specifically, the first air flow regulating device 320 can control the on/off of the air output to the pre-mixer 200 and the first combustion chamber 20, and can also adjust the air output to the pre-mixer 200 and the first combustion chamber 20. The air flow rate can also adjust the proportion of air output to the pre-mixer 200 and the first combustion chamber 20 , which can be set according to actual needs, and there is no limitation here. The excess air ratio of the first combustion chamber 20 can be adjusted through the first air flow adjustment device 320, so that the air and gas can be preheated better and the air and gas can enter high temperature better without changing the air-fuel ratio. air burning state.

1 to 4, in one embodiment, the first air flow regulating device 320 is an air flow valve 321, and the air flow valve 321 is arranged in series between the first air outlet 31b and the pre-mixer Between 200;

And/or, the air flow valve 321 is arranged in series between the second air outlet 31c and the first combustion chamber 20 .

In this embodiment, the air flow valve 321 can be located between any one of the two air pipelines 310 . Specifically, the air flow valve 321 can be arranged in series between the air inlet 31a and the pre-mixer 200, or arranged in series between the air inlet 31a and the first combustion chamber 20, and the air flow valve 321 can be set at different thermal loads. Timely adjust the opening, so as to achieve different excess air coefficients, to achieve the purpose of good preheating effect. Wherein, the air flow valve 321 may be a solenoid valve with only opening and closing, or an air flow valve 321 that can adjust different opening degrees. A higher excess air ratio in the first combustion chamber 20 can be achieved.

By adjusting the opening of the air flow valve 321, the ratio of the air flow output to the pre-mixer 200 and the first combustion chamber 20 can be adjusted, for example, the air flow valve 321 is arranged between the air inlet 31a and the first combustion chamber 20 When the opening degree of the air flow valve 321 is increased, the proportion of air output to the first combustion chamber 20 increases, and the proportion of air output to the pre-mixer 200 decreases. Conversely, if the opening of the air flow valve 321 decreases, the proportion of air output to the first combustion chamber 20 decreases, and the proportion of air output to the pre-mixer 200 increases. Similarly, when the air flow valve 321 is disposed between the air inlet 31 a and the pre-mixer 200 , the air ratio between the pre-mixer 200 and the first combustion chamber 20 can also be adjusted. In this way, it can be ensured that the air flow output to the first combustion chamber 20 and the second combustion chamber 30 can meet the preheating combustion in the first combustion chamber 20, and in the case of the high-temperature air combustion in the second combustion chamber 30, the improvement The excess air ratio of the first combustion chamber 20 .

3 and 4, in one embodiment, the pre-mixer 200 includes:

Air inlet and gas inlet;

Venturi tube 210, the first air inlet of the Venturi tube 210 communicates with the first air outlet 31b of the first air flow regulating device 320, the second air inlet of the Venturi tube 210 communicates with the Gas inlet connection;

The mixing chamber 10 , the mixing chamber 10 communicates with the venturi tube 210 and the first combustion chamber 20 and the second combustion chamber 30 .

In this embodiment, the burner assembly can also be provided with a gas pipeline, the venturi tube 210 is located between the air pipeline 310 and the gas pipeline, and between the mixing chamber 10, the venturi tube 210 and the air pipeline 310 and the gas inlet pipe Together they form a pre-mixer 200 communicating with the mixing chamber 10 . Air can enter the venturi tube 210 from the air inlet of the air pipeline 310 and form an air vortex at the outlet of the venturi tube 210 . The air vortex can entrain the gas entering from the gas inlet pipe, so that the gas and air are fully mixed in the Venturi tube 210, so that the fully mixed gas and air mixture can be fully combusted in the gas hot water equipment, thereby It can improve combustion efficiency and reduce the generation of harmful substances such as nitrogen oxides (NOx) and carbon monoxide. In this embodiment, the Venturi tube 210 communicates with the intake port and the mixing chamber 10 to output the mixed gas to the first combustion chamber 20 and the second combustion chamber 30 .

Referring to Fig. 3 and Fig. 4, in an embodiment, the air intake assembly 300 further includes:

The fan 330 is arranged in series between the air inlet and the Venturi tube 210 .

In this embodiment, the gas and air can first enter the Venturi structure, and then the mixed gas enters the fan 330 for mixing. Therefore, the fan 330 needs to use an explosion-proof fan 330, so that the air and gas have a better mixing effect. Alternatively, the fan 330 can also be placed before the Venturi device. At this time, the fan 330 can use a common fan 330 to draw air into the Venturi tube 210 through the fan 330 to complete the mixing of air and gas in the Venturi tube 210. . Wherein, under the control of the electronic control unit 500, the blower 330 adjusts its rotational speed to provide the burner unit with a corresponding flow rate of air or mixed gas under different working conditions, such as different heat load demands, to complete high-temperature air combustion.

Referring to Figures 3 and 4, in one embodiment, the burner assembly further includes:

The splitter assembly 400 is arranged between the pre-mixer 200 and the first combustion chamber 20, and the splitter assembly 400 is used to split the airflow of the pre-mixer 200 and flow them to the first combustion chamber respectively. 20 and the second combustion chamber 30 delivery.

In this embodiment, under the splitting action of the splitter assembly 400, a part of the gas enters the first combustion chamber 20 for combustion through the splitter assembly 400; the other part of the gas is blocked by the splitter assembly 400, and is sprayed downward from both sides into the second combustion chamber 30. combustion. In this way, during the working process of the burner assembly, since the pre-mixer 200 provides the mixed gas containing gas and air, the preheating burner ignites and burns the mixed gas to achieve high-temperature preheated air, and the splitter assembly 400 will mix The gas delivered by the cavity 10 is split to deliver the gas to the first combustion chamber 20 and the second combustion chamber 30 respectively, so that when the gas is delivered to the first combustion chamber 20 , preheating of gas and air is completed.

In one embodiment, due to the structural design of the splitter assembly, the second combustion chamber can achieve high-temperature air combustion conditions without separately injecting gas; in other embodiments, in order to better promote high-temperature air Combustion, in addition to separately injecting gas into the second combustion chamber 30, the combination of gas and high-temperature gas can be completed, so that the high-temperature gas ignites the gas, and forms an entrainment effect in the second combustion chamber 30, so that an injection is formed in the second combustion chamber 30 The combustion zone and the flue gas recirculation zone allow part of the high-temperature flue gas to circulate and dilute the reactants inside the second combustion chamber 30, and then fully dilute the injected gas and air to form a lower oxygen concentration, reduce the combustion reaction speed, and maintain the first The higher temperature of the second combustion chamber 30 ensures that the temperature is higher than the self-ignition point of the fuel to realize self-ignition, and through the diversion of the diverter assembly 400, the oxygen concentration can be lower than a certain value to achieve uniform combustion, thereby realizing high-temperature air combustion. When performing MILD combustion, the electronic control assembly 500 can also control the preheating burner to stop working when the temperature of the MILD burner assembly reaches above the ignition temperature of MILD combustion.

5 to 7, in one embodiment, the shunt assembly 400 includes:

The splitter 410 includes a baffle 411 between the intake chamber 10 and the first combustion chamber 20, and the baffle 411 is provided with a plurality of air holes 411a to form a space for the intake chamber. The gas of 10 flows into the first flow path of the first combustion chamber 20;

A second flow path for the gas in the intake cavity 10 to flow into the second combustion chamber 30 is formed between the side of the baffle plate 411 and the wall of the intake cavity 10 .

In this embodiment, as shown in Figure 5, the dotted line in Figure 5 indicates that the gas flowing out of the air intake cavity 10 forms at least two flow paths under the action of the baffle 411, and the baffle 411 can extend into the air intake cavity 10, and a gap is formed between the baffle plate 411 and the wall of the intake chamber 10, an air hole 411a is set in the middle of the baffle plate 411 or at a position corresponding to the first combustion chamber 20, and the gas output from the air intake chamber 10 passes through the air hole Under the action of 411a, it flows into the first combustion chamber 20 to provide the first combustion chamber 20 with air and gas required for preheating and combustion. The side of the baffle 411 and the wall of the intake chamber 10 define a gas flow path that flows into the second combustion chamber 30 at least. The second flow path formed between the walls of the intake chamber 10 flows into the second combustion chamber 30 , so as to provide the air and gas required for high-temperature air combustion for the second combustion. Wherein, the number, position and aperture of the air holes 411a on the baffle 411, as well as the area of the baffle 411, etc. can be set according to the type of gas water heating equipment used, so as to adjust the flow to the first combustion chamber 20 and the second combustion chamber 30 gas flow distribution, so as to achieve MILD combustion state.

Referring to FIG. 5 to FIG. 7 , in an embodiment, a side of the baffle plate 411 facing the air intake cavity 10 is surrounded by a plurality of side plates 412 .

In this embodiment, a plurality of plates are arranged on the side of the baffle plate 411 facing the intake chamber 10, that is, on the side away from the first combustion chamber 20, and the number of side plates 412 can be two or four. When there are two, the two side plates 412 are arranged on opposite sides of the side of the baffle 411 , and when there are four, the four side plates 412 are respectively arranged on the four sides of the baffle 411 . The height of the baffle plate 411 is adjustable. When the height of the baffle plate 411 is higher, the flow of gas flowing into the second combustion chamber 30 is less; when the height of the baffle plate 411 is lower, the gas flow into the second combustion chamber 30 The more the flow rate is, the ratio of gas flow distribution to the first combustion chamber 20 and the second combustion chamber 30 can be adjusted.

5 to 7, in one embodiment, the shunt assembly 400 further includes:

The spoiler 420 , the spoiler 420 is disposed between the flow splitter 410 and the first combustion chamber 20 to disturb the gas flowing into the first combustion chamber 20 .

Specifically, the spoiler 420 is a porous spoiler, and the porous spoiler is provided with a plurality of spoiler flow holes, and the apertures of the plurality of spoiler flow holes are smaller than the apertures of the air holes 411a of the flow divider 410 .

In this embodiment, the spoiler 420 can be implemented with a porous spoiler or a comb structure. In this embodiment, the spoiler 420 is selected as a porous spoiler to make the gas flowing into the first combustion chamber 20 more uniform , so as to ensure that the gas can be evenly mixed with the mixed gas and air in each area of the first combustion chamber 20 . The aperture of the turbulent flow hole is smaller than the aperture of the air hole 411a of the flow divider 410, and the ratio of the aperture of the turbulence flow hole to the aperture of the flow divider 410 is adjustable, and the flow to the first combustion chamber 20 and the first combustion chamber 20 can also be adjusted by adjusting the aperture of the multi-hole spoiler. The gas flow distribution ratio of the second combustion chamber 30 . When the diameter of the turbulent flow hole is larger, the flow rate of the gas flowing into the first combustion chamber 20 is larger, which can make the gas flow into the first combustion chamber 20 faster while making the gas more uniform. When the aperture of the spoiler flow hole is smaller, the gas flowing into the first combustion chamber 20 is more uniform, and the speed of the gas flowing to the first combustion chamber 20 is also blocked, and the residence time of the gas in the intake chamber is increased, so that more The gas flows to the second combustion chamber 30. Wherein, the air hole 411a and the turbulence flow hole of the flow divider 410 can be set as a circular through hole, or a square through hole, or a strip-shaped through hole, and the air hole 411a and the turbulence flow hole of the flow divider 410 can be set to be the same or different. .

Referring to Figures 5 to 7, in one embodiment, the burner assembly further includes:

Preheating burner, the preheating burner is installed in the first combustion chamber 20 formed by the main body, the preheating burner is used to ignite the mixed gas and transport it to the first combustion chamber 20 of the burner 100, and preheat the first combustion chamber 20 Heat to target temperature. Wherein, the preheating burner includes: a porous media burner 430 disposed between the spoiler 300 and the first combustion chamber 20 .

In this embodiment, the porous medium 430 combustion method is adopted, and the porous medium burner 430 is set in the first combustion chamber 20

The heat exchange tube directly exchanges heat with the high-temperature porous medium 430 in the combustion chamber in the form of radiation and heat conduction, and the high-temperature flue gas realizes a strong heat exchange between the surrounding heat exchange tube and the porous medium 430, and can rapidly cool the flue gas so that The water vapor condenses directly on the tube wall of the heat exchanger, which is beneficial to the heat exchange between the flue gas and water, greatly reduces the exhaust gas temperature of the combustion chamber, and can collect the latent heat of the water vapor in the flue gas to improve thermal efficiency. Wherein, the porous medium 430 can be a porous medium 430 material made of metal fibers, which has good thermal conductivity and mechanical strength, which is conducive to heat return, helps to reduce combustion space and enhance combustion intensity and heat transfer intensity.

1 and 2, in one embodiment, the combustion body 100 includes:

a combustion casing 110 formed with the first combustion chamber 20 and the second combustion chamber 30; and

The air intake housing 120, the air intake housing 120 is covered on one side of the combustion housing 110, and is enclosed with the combustion housing 110 to form the mixing chamber 10;

The combustion casing 110 is provided with a first air inlet connecting the mixing chamber 10 and the first combustion chamber 20 and a second air inlet connecting the mixing chamber 10 and the second combustion chamber 30 .

In this embodiment, the intake housing 120 may be the housing of the pre-mixer 200, and the pre-mixer 200 may be assembled into the intake housing 120, or the intake housing 120 may also be formed as a gas distribution chamber. The combustion housing 110 forms the first combustion chamber 20 and the second combustion chamber 30. At the same time, the heat exchanger 600 of the gas water heating equipment can also be assembled into the combustion housing 110. The combustion housing 110 and the intake housing 120 are integrated The connection can be fixed directly by means of screws, buckles, etc. Under the splitting action of the splitter assembly 400, the gas in the mixing chamber 10 flows to the first air inlet and the second air inlet respectively, so as to provide the first combustion chamber 20 with the air required for preheating combustion through the first air inlet. and gas, the air and gas required for high-temperature air combustion are increased to the second combustion chamber 30 through the second air inlet.

5 to 7, in one embodiment, the combustion casing 110 includes:

The frame portion 111 has opposite first and second sides, and the first combustion chamber 20 and the second combustion chamber 30 are arranged in sequence from the first side to the second side, and the frame portion 111 The first side of the frame body part 111 is a frame opening, and at least one side frame of the frame body part 111 is provided with a gas connection piece 1114; and

The fixing plate 112, the fixing plate 112 is covered on the first side of the frame part 111, and the air intake housing 120 is covered on the side of the fixing plate 112 facing away from the frame part 111; The first air inlet 121a is arranged at the position of the fixed plate 112 corresponding to the first combustion chamber 20 , and the second air inlet 121b is arranged at the position of the fixed plate 112 corresponding to the gas connector 1114 position, the gas connecting piece 1114 communicates with the intake chamber 10 and the second combustion chamber 30 .

In this embodiment, the first side of the frame part 111 is fixedly connected to the air intake housing 120, the fixing plate 112 is interposed between the frame part 111 and the air intake housing 120, and the frame part 111 can be provided with Screw holes, corresponding positions on the air intake housing 120 and the fixed plate 112 are provided with through holes, the screws pass through the through holes on the air intake housing 120 and the fixed plate 112, and are installed in the screw holes of the frame part 111, so that The intake casing 120 , the fixing plate 112 and the frame part 111 are fixed by screws. The fixed plate 112 covers the frame opening, and at least two air inlets are provided on the fixed plate 112, that is, the first air inlet 121a and the second air inlet 121b. Further, the fixed plate 112 corresponds to the The periphery of the first air inlet 121a protrudes toward the first combustion chamber 20 to form an installation portion for the spoiler 420 and the porous medium 430 to be fixedly installed. Wherein, the size of the installation part, that is, the diameter of the first air inlet 121 a can be set according to the areas of the spoiler 420 and the porous medium 430 .

Referring to Fig. 5 and Fig. 6, in one embodiment, the heat exchanger assembly 1 includes a first end cover 1111, a second end cover 1112 and a circumference connecting the first end cover 1111 and the second end cover 1112, which are arranged oppositely. A side plate 1113, a first water cavity 111a is formed in the first end cover 1111, a second water cavity 111b is formed in the second end cover 1112, and the first water cavity 111a and the second water cavity 111b pass through At least one heat absorbing pipe 500 is connected in series to form a series waterway.

In this embodiment, the heat absorption pipe 500 can be arranged to form a water passage, and the water passage can also be designed inside the combustion body 100 . Then, the water passages may all be formed by the channels in the heat absorbing pipe 500 , or all be formed by the channels in the combustion body 100 . It is also possible to make the water channel partly formed by the channel in the heat absorption pipe 500 , and partly formed by the channel in the combustion body 100 . The flow path of the water passage can only extend along a part of the wall of the combustion body 100 , or can be arranged around the wall of the combustion body 100 , or can be arranged in a spiral shape and multi-layered around the wall of the combustion body 100 . The flow path of the water passage is not specifically limited here, and can be selected and designed according to actual needs. The first water cavity 111a is formed in the first end cover 1111, the second water cavity 111b is formed in the second end cover 1112, and a heat-absorbing pipe 500 is connected in series to form a water passage, so that the water capacity can be fully utilized. Specific heat capacity, the water flowing in the water passage can take away the heat of the combustion body 100 and absorb the heat of the first combustion chamber 20 and the second combustion chamber 30, so that the entire water passage can absorb the heat of the combustion body 100 and the combustion chamber 11 better. Wherein, the heat absorption pipe 500 may be specifically arranged as a straight pipe, extending along the length direction of the combustion body 100 . By forming the first water cavity 111a in the first end cover 1111 and the second water cavity 111b in the second end cover 1112, the space in the end cover is fully utilized without affecting the use effect of the end cover, so that the water channel The flow through the inside of the first end cover 1111 and the second end cover 1112 makes the overall cooling area larger. Moreover, the heat absorbing pipe 500 is located in the combustion chamber 11, and the heat exchange rate between the heat absorbing pipe 500 and the airflow in the combustion chamber 11 can be improved, and the temperature in the combustion chamber 11 can be sufficiently reduced to prevent heat from radiating to the outside of the burner assembly 100. Reduce the generation of pollutants. The material of the heat-absorbing pipe 500 should be a material with high temperature resistance and good thermal conductivity. Wherein, the first end cover 1111 is surrounded by the first sub-end cover 1111a and the first sub-end cover 1111b, and the first sub-end cover 1111a and the second sub-end cover 1111b form the first water cavity 111a. Similarly, the first end cover 1112 is surrounded by the second sub-end cover 1112a and the second sub-end cover 1112b, and the second sub-end cover 1112a and the second sub-end cover 1112b form the first water cavity 111b.

Referring to Fig. 5 and Fig. 6, in one embodiment, the number of the peripheral side plates 1113 is two, and the two peripheral side plates 1113 are arranged opposite to each other;

The two peripheral side plates 1113 are respectively provided with connection pieces 1114 communicating with the gas.

In this embodiment, MILD inlet chambers 10 are provided on the two peripheral side plates 1113, that is, the gas connection piece 1114, and the gas connection piece 1114 and the combustion body 100 can be integrally formed or separately formed. When separately installed, the gas connecting piece 1114 and the combustion body 100 can be fixedly connected by means of screws, welding or the like. By forming the connection channel in the gas connection part 1114 , the gas output from the intake chamber 10 can flow into the second combustion chamber 30 from the second flow path formed by the splitter assembly 400 and the wall of the intake chamber 10 . The gas connection 1114 extends along the length of the combustion body 100 . The gas connection piece 1114 has a pipe body with an opening (air inlet 1114a) on the side facing the inlet chamber 10, and the inlet 1114a facing the inlet chamber 10 is used to access the gas output by the inlet chamber 10, There is at least one gas outlet on the other side of the pipe body, and the gas outlet communicates with the second combustion chamber 30 . Two gas connectors 1114 are provided on both sides of the combustion body, so as to deliver gas to the second combustion chamber 30 from both sides, so that the gas flowing into the second combustion chamber 30 can be more uniform. Of course, in other embodiments, the number of the gas connecting piece 1114 can also be set to one, which is not limited here.

Referring to FIG. 5 and FIG. 6 , in one embodiment, a plurality of gas holes 1114 b are provided at one end of the gas connecting member 1114 near the second combustion chamber 30 for gas to flow into the second combustion chamber 30 .

In this embodiment, after the gas entering from the gas connecting piece 1114 is disturbed by the multiple gas holes 1114b, the gas is sprayed into the second combustion chamber 30, and the injection flow rate of the multiple gas holes 1114b is more uniform, and it can ensure that each The gas flow rate injected by each gas hole 1114b, and then realize the combustion of the whole second combustion chamber 30 is more stable, so as to realize entrainment and dilution of high-temperature flue gas, so that the gas and air in the second combustion chamber 30 can be mixed evenly, so that the second combustion chamber 30 The oxygen concentration in the second combustion chamber will also be balanced and lower than a certain value. When burning, not only the gas can be fully combusted, which reduces the emission of pollutants, but also the gas in the second combustion chamber 30 will also burn evenly, and there will be no The problem of excessive local combustion and noise. In addition, high-speed jet entrainment is achieved through multiple gas holes 1114b on both sides, and high-temperature flue gas backflow can be realized, so that the temperature of the second combustion chamber 30 can be kept higher than the self-ignition point of the fuel, as long as the gas is continuously injected. Keep burning. The heat after combustion can be exchanged with the heat exchanger 50 of the gas-fired hot water equipment to realize the production of hot water. By arranging gas connecting pieces 1114 on both sides in the width direction of the combustion body 100, and making the multiple gas holes 1114b of the two gas connecting pieces 1114 arranged sequentially in the length direction of the combustion body 100, the combustion body can be The opposite sides of 100 inject gas and/or air into the second combustion chamber 30. On the one hand, the gas injection volume is increased, and on the other hand, the mixed gas of gas and air is evenly distributed in the combustion chamber, and is fully combined with high-temperature air. to burn.

5 to 7, in one embodiment, a gap is formed between the flow divider 410 and the inner side wall of the intake housing 120, and the gap is for the gas of the intake chamber 10 to flow into The flow paths of the first combustion chamber 20 and the second combustion chamber 30 .

A gap α is formed between the splitter 410 and the fixing plate 112 , and the gap is a flow path for the gas in the intake chamber 10 to flow into the first combustion chamber 20 .

In this embodiment, the gap β formed between the flow divider 410 and the inner side wall of the intake housing 120 is the second flow path, and the gap formed between the flow divider 410 and the fixed plate 112 is the flow path into the first combustion chamber 20. That is to say, the gas output from the intake chamber 10 flows to the flow divider 410, and a part of the gas flows directly to the porous spoiler through the porous structure on the flow divider 410, and enters the first combustion chamber 20 for combustion through the porous medium 430; The other part of the gas is blocked by the flow divider 410, disturbed from both sides, and split again at the connection between the fixed plate 112 and the combustion shell 110, and part of it flows to the porous spoiler, and enters the first combustion chamber 20 through the porous medium 430 The other part is injected into the second combustion chamber 30 for combustion through the gas connecting piece 1114 , that is, the MILD intake chamber 10 . Of course, in other embodiments, the baffle plate 411 may not be provided with air holes 411a. If there is no hole on the baffle plate, after the gas flows in from the inlet of the air intake chamber 10, it will be directly disturbed by the baffle plate 411 to the peripheral side of the baffle plate 411. . It can be adjusted by adjusting the size of the baffle plate 411, the number and distribution of holes on the flow divider 410, the distance α between the baffle plate and the intake housing 120, the distance β between the baffle plate and the fixed plate 112, and the size of the MILD air intake chamber 10. The opening size γ is used to adjust the gas flow distribution to the first combustion chamber 20 and the second combustion chamber 30, so as to achieve the MILD combustion state. The distance between the flow divider 410 and the inner sidewall of the intake housing 120 is adjustable. The distance between the splitter 410 and the fixing plate 112 is adjustable.

In a specific embodiment, the baffle 411 can be driven to move by a driving member, thereby adjusting the relative distance between the baffle 411 and the fixed plate 112 , and adjusting the relative distance α between the baffle 411 and the intake housing 120 , Then adjust the size of the gap to realize the distribution of gas flow.

A gas valve 220 , the gas valve 220 is disposed between the gas inlet and the Venturi tube 210 .

In this embodiment, the gas valve 220 may be a solenoid valve with only opening and closing, or a gas proportional valve that adjusts different opening degrees. The gas valve 220 is arranged between the gas inlet port and the pre-mixer 200. The opening of the gas valve 220 is adjustable. By adjusting the opening of the gas valve 220, the gas delivered to the first combustion chamber 20 and the second combustion chamber can be adjusted. The gas flow rate in the chamber 30 increases, for example, when the opening of the gas valve 220 increases, the gas output to the pre-mixer 200 and the second combustion chamber 30 increases.

Referring to FIG. 3 and FIG. 4 , in one embodiment, the number of gas channels formed between the second air outlet 31c of the first air flow regulating device 320 and the first combustion chamber 20 is multiple.

In this embodiment, the gas pipeline is connected between the first air flow regulating device 320 and the first combustion chamber 20, and the number of gas pipelines between the first air flow regulating device 320 and the first combustion chamber 20 can be two or Multiple strips, for example, are arranged on opposite sides of the gas casing, so that the air output to the first combustion chamber 20 is more uniform, which is beneficial to improve the combustion effect of high-temperature air combustion.

An electric control assembly 500, the electric control assembly 500 is electrically connected with the air intake assembly 300, and is used to control the air intake assembly 300 to deliver air to the pre-mixer 200 and the first combustion chamber 20 respectively, and to control the delivery The air flow rate to the first combustion chamber 20 is such that the mixed gas and air are heated to a preset target temperature in the first combustion chamber 20 and then sent to the second combustion chamber 30 for high-temperature air combustion.

In this embodiment, the electric control assembly 500 includes an electric control board and a burner assembly control circuit arranged on the electric control board. Specifically, the burner assembly control circuit can be a main controller, a gas valve drive circuit, a fan drive Proportional valve drive circuit, etc., wherein, the gas valve drive circuit, fan drive circuit, gas proportional valve drive circuit can be realized by using a drive circuit composed of a relay, MOS tube, IGBT and other power tubes. The main controller can receive control instructions input by users through wireless communication circuits, such as Bluetooth modules, infrared induction circuits, WIFI modules, etc., and control the burner components to work according to the corresponding control instructions to meet the user's water demand.

As shown in Figures 8 to 13, in an embodiment of the present application, the burner assembly includes:

The pre-mixer 200 communicates with the first combustion chamber 20 and the second combustion chamber 30 in turn, and the pre-mixer 200 is used to deliver mixed gas to the first combustion chamber 20 and the second combustion chamber 30; and,

The air intake assembly 300 has a gas inlet 31a, a first gas outlet 31b and a second gas outlet 31c, the gas inlet 31a of the air intake assembly 300 is connected to gas, and the first gas The outlet 31b communicates with the gas inlet 31a of the premixer 200, and the second gas outlet 31c of the air intake assembly 300 communicates with the second combustion chamber 30; wherein,

The intake assembly 300 is used to deliver gas to the pre-mixer 200 and the first combustion chamber 20 respectively, and can control the gas flow rate delivered to the second combustion chamber 30 .

The combustion main body 100 includes a shell, and the shell is formed with a first combustion chamber 20 and a second combustion chamber 30. In this embodiment, the shape of the combustion main body 100 shell can be square, cylindrical, etc., and can be customized according to actual needs. Selection and design are not specifically limited here. The shell is also provided with a smoke exhaust port. When the gas burns at high temperature in the second combustion chamber 30, the heat after combustion is discharged through the smoke exhaust port, and can exchange heat with the heat exchanger of the gas water heater to realize the production Get hot water. The gas water heater also includes a preheating burner installed in the first combustion chamber 20; a heat exchanger located between the smoke outlet and the second combustion chamber 30; the burner assembly also includes an electric control assembly 500, and the gas water heater also includes The water inlet pipe for introducing water into the gas water heater, the hot water outlet pipe for providing hot water to the outside, the smoke exhaust pipe connected to the smoke exhaust port, the gas inlet pipeline and the inlet valve for connecting the gas. Among them, the preheating burner is used to heat the gas in the MILD combustion chamber. The preheating burner can adopt a honeycomb structure that can effectively prevent flashback during combustion. For example, the gas water heater also includes an igniter, which is used to ignite the gas injected from the preheating burner. The gas water heater also includes an electric control assembly 500, which is used to control the combustion work of the preheating burner when the gas water heater is started. The mixed gas with air is combusted to heat the air in the first combustion chamber 20 to form high-temperature flue gas. It can be understood that, by controlling the heating temperature, the air in the first combustion chamber 20 can be heated to the target temperature, that is, the above-mentioned preset temperature, so that high-temperature preheating of the air is realized. After the high-temperature preheated gas is sent into the second combustion chamber 30 , gas is injected into the second combustion chamber 30 , the gas is combined with the high-temperature gas, and the high-temperature gas ignites the gas to realize MILD combustion in the second combustion chamber 30 . Wherein, the first combustion chamber 20 is a preheating combustion chamber, and the second combustion chamber 30 is a high-temperature air combustion chamber.

When performing preheating combustion and high-temperature air combustion, it is necessary to provide air and gas to the first combustion chamber 20 and the second combustion chamber 30 respectively. In order to improve the combustion efficiency of the burner assembly, one of the embodiments of the present application is for the first When the combustion chamber 20 and the second combustion chamber 30 provide air and gas, the air and gas are mixed first. For example, this solution is applied to a fully premixed gas water heater, and a fully premixed burner assembly is installed in the first combustion chamber. The blower 220 sucks in air, mixes it with the gas, and injects the mixture of gas and air into the first combustion chamber 20 and the second combustion chamber 30 .

Another embodiment of the present application is to provide unmixed gas through different pipelines, which is applied in a forced-pump gas water heater. By injecting the gas into the air, and then spraying it into the first combustion chamber 20 and the second combustion chamber 30, the strong The drum type can be inhaled by the fan 220, and then sprayed into the combustion chamber respectively. The way of providing air and gas to the first combustion chamber 20 and the second combustion chamber 30 is realized through pipelines. Therefore, in a specific application embodiment, control valves, such as solenoid valves, are used to control the gas and gas in the pipelines in specific application embodiments. The air flow rate is used to distribute the gas and air flowing into the first combustion chamber 20 and the second combustion chamber 30 .

In this embodiment, the gas delivered to the first combustion chamber 20 and the second combustion chamber 30 is an example for illustration. The pre-mixer 200 has a gas inlet and an air inlet. The pre-mixer 200 connects the gas and air The air output from the intake assembly 300 is mixed and then output to the first combustion chamber 20 and the second combustion chamber 30 to complete preheating combustion and high-temperature air combustion.

In this implementation, the air intake assembly 300 is provided so that during the working process of the burner assembly, the air intake assembly 300 divides the incoming gas into two parts, so as to deliver the gas to the premixer 200 and the second combustion chamber 30 respectively, specifically , the air intake assembly 300 sends a part of the gas to the pre-mixer 200, so that the pre-mixer 200 mixes the incoming gas and air, and then sends the mixed gas to the first combustion chamber 20 and the second combustion chamber 30, the air intake assembly 300 Then another part of the gas is delivered to the second combustion chamber 30 .

In this way, when the gas is delivered to the first combustion chamber 20, the preheating of the gas and all air required for high-temperature air combustion is completed, so that when the gas is injected into the second combustion chamber 30 through the air intake assembly 300, more The combination of a large amount of mixed gas and the gas in the second combustion chamber 30 makes the excess air in the high-temperature gas relatively high, which is enough to ignite the gas. And the entrainment effect is formed in the second combustion chamber 30, and a spray combustion zone and a flue gas recirculation zone are formed in the second combustion chamber 30, so that part of the high-temperature flue gas (exhaust gas rich in N2 and CO2) in the second combustion chamber 30 internal loops to dilute the reactants.

Gas is added to the second combustion chamber 30 in two ways through the air intake assembly 300, one of which is directly fed into the second combustion chamber 30 through the air intake assembly 300, and the other is pre-mixed with the gas through the pre-mixer 200. to the first combustion chamber 20 and the second combustion chamber 30 , and then the first combustion chamber 20 preheats most of the air required for preheating combustion and high-temperature air combustion. When the mixed gas and gas are passed into the second combustion chamber 30, the air in the preheated mixed gas is fully diluted by the mixed gas and gas passed into the second combustion chamber 30, forming a lower oxygen concentration and reducing combustion. reaction speed, and maintain a higher temperature in the second combustion chamber 30 to ensure that the temperature is higher than the self-ignition point of the fuel to achieve self-ignition, thereby realizing high-temperature air combustion.

It should be noted that the target temperature of the high-temperature preheating air should not be too low. Generally, it can be controlled at 1200 degrees Celsius to ensure that when the high-temperature gas contacts the gas in the second combustion chamber 30, better automatic combustion can be achieved, and ignition is no longer required. burn. Among them, the target temperature can be achieved by controlling the heating time, controlling the gas-air ratio, keeping warm, increasing the residence time of the high-temperature gas in the first combustion chamber 20 and other methods. The gas injection speed and gas flow rate delivered by the air intake assembly 300 to the second combustion chamber 30 can be adjusted according to demand, specifically according to the preset temperature, ambient temperature, water inlet flow rate, water outlet temperature, ambient pressure, etc., and the adjusted ratio And the process can be predetermined and set.

It can be understood that when the gas and air are mixed first, it can be realized by using the pre-mixer 200. Part of the mixed gas flow enters the first combustion chamber 20 for combustion for preheating combustion; the other part of the mixed gas is injected into the first combustion chamber. The second combustion chamber 30 burns. Since the mixed gas containing gas and air is provided by the pre-mixer 200, the preheating burner ignites and burns the mixed gas to realize high-temperature preheated air, and the mixed gas of gas and air is delivered to the second combustion chamber 30, and then passed The air intake assembly 300 sends gas to the second combustion chamber 30, so that more air can be preheated in the first combustion chamber 20, thereby generating an entrainment effect in the second combustion chamber 30, so that the high-temperature flue gas flows back, On the one hand, heat preservation can make the temperature higher than the spontaneous ignition point of the fuel, so that the gas in the combustion chamber can spontaneously ignite; Air combustion can meet MILD combustion requirements and reduce CO and NOx emissions. In order to achieve better preheating of air and gas, different excess air coefficients, that is, air excess coefficients, can be set for the first combustion chamber 20 and the second combustion chamber 30. The combustion chamber 30 provides gas, while the air flowing to the first combustion chamber 20 and the second combustion chamber 30 is all provided through the pre-mixer 200, so that more air can be preheated by the preheating burner in the first combustion chamber 20 That is, the excess air ratio of the first combustion chamber 20 is higher than that of the second combustion chamber 30, so that more air participates in the combustion of the first combustion chamber 20 and is directly heated, which can improve the preheating effect. The technical solution of this embodiment is conducive to simultaneously achieving the above two conditions required for realizing MILD combustion, and successfully realizing high-temperature air combustion. Moreover, the structure of the burner component frame can miniaturize the components that realize high-temperature air combustion, so that it has more application space and value. In addition, it has low noise, sufficient combustion, and low exhaust gas pollution. It is widely used in gas water heaters. And related products and equipment including gas wall-hung boilers that use gas combustion to generate high-temperature hot water for family bathing and heating, etc., not only meet the requirements, but also bring sufficient combustion that the burner components in existing water heaters do not have. , Low pollutant emission effect.

In this embodiment, the air intake assembly 300 is set so that under the action of the air intake assembly 300 on the gas splitting, the output gas gas is divided into at least two gas flow paths for output, and one path is output to the pre-mixer 200 so that a part of the gas and air are mixed and then enter The first combustion chamber 20 forms high-temperature flue gas after combustion in the first combustion chamber 20, and another part of the gas is directly injected into the second combustion chamber 30, and the high-temperature flue gas formed by combustion in the first combustion chamber 20 is discharged by the second combustion chamber 30. The injected high-speed gas is entrained, so that after the gas injected into the second combustion chamber 30 is diluted with the preheated high-temperature air, high-temperature air combustion is finally realized to reduce CO and NOx emissions of the gas water heater. In this application, the air intake assembly 300 is used to complete high-temperature air combustion. After the mixed gas is properly distributed to the two-stage combustion chamber, the air intake assembly 300 can also output another gas to the second combustion chamber 30, which can be used under a certain air-fuel ratio. In this way, more air is preheated in the first combustion chamber 20, thereby increasing the excess air ratio of the first combustion chamber 20, that is, more air participates in the combustion of the first combustion chamber 20 and is directly heated. It is conducive to improving the preheating effect, making it easier for the water heater to enter the high-temperature air combustion state, and is conducive to achieving lower NOx and CO emissions.

As shown in Figures 12 and 13, in one embodiment, the air intake assembly 300 includes:

a gas pipeline 310, communicating with the gas inlet 31a, the first gas outlet 31b and the second gas outlet 31c;

The first gas flow regulating device 320 is arranged on the gas pipeline 310 , and the first gas flow regulating device 320 is used for regulating the gas flow output to the pre-mixer 200 and the second combustion chamber 30 .

In this embodiment, the pre-mixer 200 and the air intake assembly 300 are connected through pipelines, and an air inlet duct is also formed in the combustion body 100, and the mixing channel communicates with the pre-mixer 200, the gas passage and the air inlet duct in turn. , the first gas flow regulating device 320 can regulate the gas flow output to the pre-mixer 200 and the second combustion chamber 30 . Specifically, the first gas flow regulating device 320 can control the on/off of the gas output to the pre-mixer 200 and the second combustion chamber 30 , and can also adjust the gas output to the pre-mixer 200 and the second combustion chamber 30 The gas flow rate can also be adjusted to the proportion of the gas output to the pre-mixer 200 and the second combustion chamber 30, which can be set according to actual needs, and there is no limitation here. The excess air ratio of the first combustion chamber 20 can be adjusted through the first gas flow regulating device 320, so that the air and gas can be preheated better and the air and gas can enter high temperature better without changing the air-fuel ratio. air burning state.

As shown in Figures 12 and 13, in one embodiment, the first gas flow regulating device 320 includes:

a gas valve 321, the gas valve 321 is arranged between the gas inlet 31a, and the first gas outlet 31b and the second gas outlet 31c;

a gas proportional valve 322, the gas proportional valve 322 is arranged in series between the gas valve 321 and the pre-mixer 200;

And/or, the gas proportional valve 322 is arranged in series between the gas valve 321 and the second combustion chamber 30 .

In this embodiment, the gas valve 321 and the gas proportional valve 322 are respectively located in the trunk road and the branch road 2 of the gas. Specifically, the gas proportional valve 322 is arranged in series between the gas valve 321 and the premixer 200, or is arranged in series between the gas valve 321 and the second combustion chamber 30. The gas proportional valve 322 can adjust the opening degree under different heat loads, In order to achieve different excess air coefficients, to achieve the best results. Wherein, the gas valve 321 may be a solenoid valve with only opening and closing, or a gas proportional valve 322 that can adjust different opening degrees. Of course, in other embodiments, the gas proportional valve 322 can also be replaced with an on-off electromagnetic valve, which can achieve a higher excess air coefficient in the first combustion chamber 20 and a better preheating effect; The solenoid valve of the circuit is replaced by a proportional valve. Of course, in other embodiments, the two valves can be arranged on the main road (on the gas inlet 31a), the branch road 1 (the pipeline between the gas valve 321 and the pre-mixer 200 ) and the branch road 2 (the pipeline between the gas valve 321 and the second combustion chamber 30 ) any two of the three. For example, the gas valve 321 is respectively arranged between the branch 1 and the branch 2, that is, the gas valve 321 is arranged between the gas inlet 31a and the first gas outlet 31b; the gas proportional valve 322 is connected in series It is arranged between the gas inlet 31 a and the second combustion chamber 30 .

In this embodiment, the gas valve 321 is arranged between the gas inlet 31a, and between the first gas outlet 31b and the second gas outlet 31c, and the gas proportional valve 322 is arranged in series between the gas valve 321 and the second gas outlet 31c. Between the chambers 30 as an example, and the opening of the gas valve 321 is adjustable, by adjusting the opening of the gas valve 321, the flow of gas delivered to the first combustion chamber 20 and the second combustion chamber 30 can be adjusted, for example, in As the opening of the gas valve 321 increases, the amount of gas output to the pre-mixer 200 and the second combustion chamber 30 increases. Conversely, if the opening degree of the gas valve 321 decreases, the amount of gas output to the pre-mixer 200 and the second combustion chamber 30 decreases. By adjusting the opening of the gas proportional valve 322, the gas flow ratio output to the pre-mixer 200 and the second combustion chamber 30 can be adjusted. For example, when the gas proportional valve 322 is arranged between the gas valve 321 and the second combustion chamber 30, As the opening of the gas proportional valve 322 increases, the proportion of gas output to the second combustion chamber 30 increases, and the proportion of gas output to the pre-mixer 200 decreases. Conversely, if the opening of the gas proportional valve 322 decreases, the proportion of gas output to the second combustion chamber 30 decreases, and the proportion of gas output to the pre-mixer 200 increases. Similarly, when the gas proportional valve 322 is arranged between the gas valve 321 and the pre-mixer 200 , the gas ratio between the pre-mixer 200 and the second combustion chamber 30 can also be adjusted. In this way, it can be ensured that the air flow output to the first combustion chamber 20 and the second combustion chamber 30 can meet the preheating combustion in the first combustion chamber 20, and in the case of the high-temperature air combustion in the second combustion chamber 30, the improvement The excess air ratio of the first combustion chamber 20 .

As shown in Figures 12 and 13, in one embodiment, the number of gas channels formed between the second gas outlet 31c of the first gas flow regulating device 320 and the second combustion chamber 30 is multiple.

In this embodiment, the gas pipeline is connected between the first gas flow regulating device 320 and the second combustion chamber 30, and the number of gas pipelines between the first gas flow regulating device 320 and the second combustion chamber 30 can be two or many lines. As shown in Figure 2, the two gas pipelines between the first gas flow regulating device 320 and the second combustion chamber 30 are marked as 311 and 312 respectively, and the

gas pipelines

311 and 312 are arranged on opposite sides of the gas casing 110, so that the output The gas delivered to the second combustion chamber 30 is more uniform, which is conducive to improving the combustion effect of high-temperature air combustion.

The present application also provides a gas hot water device. The gas water heating equipment includes the above-mentioned burner assembly, and the heat exchanger produces hot water through the heat generated by the burner assembly. The detailed structure of the burner assembly can refer to the above-mentioned embodiment, and will not be repeated here; The examples include all the technical solutions of all the embodiments of the above-mentioned burner assembly, and the achieved technical effects are also exactly the same, so they will not be repeated here.

In one embodiment, the gas hot water equipment further includes:

A heat exchanger (not shown in the figure), one end of the heat exchanger communicates with the cold water inlet pipe, and the other end communicates with the hot water outlet pipe, and the heat exchanger is used to absorb the combustion of the first combustion chamber 20 of the burner assembly and the second The combustion chamber 30 burns generated heat and exchanges the absorbed heat with water inside the heat exchanger.

In this embodiment, the cold water inlet pipe is used to introduce cold water from the outside to the gas hot water equipment, and send the cold water to the heat exchanger, and the heat exchanger absorbs the heat generated by the preheating burner and MILD combustion to heat the cold water into hot water. Water and hot water are led to the gas hot water equipment through the hot water outlet pipe.

The above are only optional embodiments of the application, and are not intended to limit the patent scope of the application. Under the application concept of the application, the equivalent structural transformation made by using the description of the application and the contents of the accompanying drawings, or direct/indirect Applications in other relevant technical fields are included in the patent protection scope of the present application.

Claims

A burner assembly, wherein the burner assembly includes:

a combustion body, the combustion body has a first combustion chamber and a second combustion chamber connected in sequence;

a pre-mixer for delivering mixed gas to the first combustion chamber and the second combustion chamber; and,

The intake assembly has an air intake, a first air outlet and a second air outlet, the air intake of the intake assembly receives air, the first air outlet of the intake assembly is connected to the pre-mixer The air intake port of the air intake assembly communicates with the second air outlet of the air intake assembly and the first combustion chamber; wherein,

The intake assembly is used to deliver air to the pre-mixer and the first combustion chamber, and can control the flow rate of air delivered to the first combustion chamber.
The burner assembly of claim 1, wherein said air intake assembly comprises:

an air pipeline communicating with the air inlet, the first air outlet and the second air outlet;

A first air flow regulating device is arranged on the air pipeline, and the first air flow regulating device is used for regulating the air flow output to the pre-mixer and the first combustion chamber.
The burner assembly of claim 2, wherein said first air flow regulating device is an air flow valve disposed in series between said first air outlet and said premixer.
The burner assembly according to claim 2, wherein said first air flow regulating device is an air flow valve disposed in series between said second air outlet and said first combustion chamber.
The burner assembly of claim 3, wherein said premixer comprises:

Air inlet and gas inlet;

A Venturi tube, the first air inlet of the Venturi tube communicates with the first air outlet of the first air flow regulating device, and the second air inlet of the Venturi tube communicates with the gas inlet;

A mixing chamber, the mixing chamber communicates with the Venturi tube and the first combustion chamber and the second combustion chamber.
The burner assembly of claim 5, wherein said air intake assembly further comprises:

A fan, the fan is arranged in series between the air inlet and the Venturi tube.
The burner assembly of claim 5, wherein said burner assembly further comprises:

A splitter component is arranged between the pre-mixer and the first combustion chamber, and the splitter component is used to divide the airflow of the pre-mixer into the first combustor and the second combustor respectively. Combustion chamber delivery.
The burner assembly of claim 7, wherein said flow diverter assembly comprises:

A flow splitter, including a baffle between the intake cavity and the first combustion chamber, and a plurality of air holes are arranged on the baffle to form the air for the gas in the intake cavity to flow into the the first flow path of the first combustion chamber;

A second flow path for the gas in the intake cavity to flow into the second combustion chamber is formed between the side of the baffle and the wall of the intake cavity;

A spoiler, the spoiler is arranged between the flow divider and the first combustion chamber to disturb the gas flowing into the first combustion chamber.
The burner assembly of claim 7, wherein said combustion body comprises:

a combustion housing formed with said first and second combustion chambers; and

an air intake casing, the air intake casing is covered on one side of the combustion casing, and is enclosed with the combustion casing to form the mixing chamber;

The combustion casing is provided with a first air inlet connecting the mixing chamber and the first combustion chamber and a second air inlet connecting the mixing chamber and the second combustion chamber.
The burner assembly of claim 5, wherein said burner assembly further comprises:

A gas valve, the gas valve is arranged between the gas inlet and the Venturi tube.
The burner assembly according to claim 2, wherein the number of gas passages formed between the second air outlet of the first air flow regulating device and the first combustion chamber is multiple.
The burner assembly of claim 2, wherein said first combustor is a preheat combustor and said second combustor is a high temperature air combustor.
The burner assembly of claim 1, wherein said burner assembly further comprises:

An electric control assembly, the electric control assembly is electrically connected to the air intake assembly, and is used to control the air intake assembly to deliver air to the premixer and the first combustion chamber respectively, and to control the delivery to the first combustion chamber The air flow rate of the chamber is such that the mixed gas and air are heated to a preset target temperature in the first combustion chamber and then delivered to the second combustion chamber for high-temperature air combustion.
A burner assembly, wherein the burner assembly includes:

A combustion body, the combustion body has a first combustion chamber and a second combustion chamber connected in sequence; a pre-mixer, which communicates with the first combustion chamber and the second combustion chamber in sequence, and the pre-mixer is used to give the first combustion chamber a combustion chamber and a second combustion chamber deliver the mixed gas; and,

The air intake assembly has a gas inlet, a first gas outlet and a second gas outlet, the gas inlet of the air intake assembly is connected to gas, the first gas outlet of the air intake assembly is connected to the pre-mixer The gas inlet port of the air intake assembly is connected, and the second gas outlet of the air intake assembly is connected with the second combustion chamber; wherein,

The air intake component is used to deliver gas to the pre-mixer and the second combustion chamber respectively, and can control the flow rate of the gas delivered to the gas.
The burner assembly of claim 14, wherein said air intake assembly comprises:

a gas pipeline, communicating with the gas inlet, the first gas outlet and the second gas outlet;

The first gas flow regulating device is arranged on the gas pipeline, and the first gas flow regulating device is used to regulate the gas flow output to the pre-mixer and the second combustion chamber.
The burner assembly of claim 15, wherein said first gas flow regulating means comprises:

A gas valve, the gas valve is arranged between the gas inlet and the first gas outlet and/or the second gas outlet.
The burner assembly according to claim 16, wherein said first gas flow adjustment device further comprises:

A gas proportional valve, the gas proportional valve is arranged in series between the gas valve and the pre-mixer.
The burner assembly of claim 17, wherein said gas proportional valve is arranged in series between said gas valve and said second combustion chamber.
A gas hot water device, comprising the burner assembly according to claim 1.
The gas water heater according to claim 19, wherein the gas water heater further comprises:

One end of the heat exchanger is connected to the cold water inlet pipe, and the other end is connected to the hot water outlet pipe. The heat exchanger is used to absorb the heat generated by the combustion of the first combustion chamber and the second combustion chamber of the burner assembly and The absorbed heat is exchanged with the water inside the heat exchanger.