CN115560326A - Combustor subassembly and gas hot water equipment - Google Patents

Abstract

The invention discloses a burner assembly and gas water heating equipment, the burner assembly includes: the combustion body is provided with a first combustion chamber and a second combustion chamber which are sequentially communicated; the premixer is used for conveying mixed gas to the first combustion chamber and the second combustion chamber; the air inlet assembly is provided with an air inlet, a first air outlet and a second air outlet, the air inlet of the air inlet assembly is connected with air, the first air outlet of the air inlet assembly is communicated with the air inlet of the premixer, and the second air outlet of the air inlet assembly is communicated with the first combustion chamber; the air inlet assembly is used for conveying air to the premixer and the first combustion chamber and can control the air flow conveyed to the first combustion chamber.

Description

Combustor subassembly and gas hot water equipment

Technical Field

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

Background

High temperature air combustion (high temperature air combustion) is called MILD and deep low oxygen dilution combustion, and is called a novel combustion mode for short, namely MILD combustion. The main characteristics of the combustion are as follows: the chemical reaction mainly takes place in a high-temperature low-oxygen environment, the temperature of the reactants is higher than the autoignition temperature of the reactants, the maximum temperature rise in the combustion process is lower than the autoignition temperature of the reactants, and the volume fraction of oxygen is diluted by combustion products to an extremely low concentration, usually 3-10%. Compared with conventional combustion, in the combustion state, the pyrolysis of fuel is inhibited, the flame thickness is thickened, and the flame front surface disappears, so that the temperature of the whole hearth is very uniform during the combustion, and the emission of pollutants NOx and CO is greatly reduced.

Although high-temperature air combustion has the advantages, at present, it is difficult to meet combustion conditions in a gas-fired water heating device to produce a good combustion effect.

Disclosure of Invention

The main object of the present invention is to propose a burner assembly and a gas-fired water heating apparatus, aiming at reducing the emission of pollutants (CO and NOx) and reducing the noise of the gas-fired water heating apparatus.

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

the combustion device comprises a combustion main body, a first combustion chamber and a second combustion chamber, wherein the first combustion chamber and the second combustion chamber are sequentially communicated;

the premixer is used for conveying mixed gas to the first combustion chamber and the second combustion chamber; and the number of the first and second groups,

the air intake assembly is provided with an air inlet, a first air outlet and a second air outlet, the air inlet of the air intake assembly is connected with air, the first air outlet of the air intake assembly is communicated with the air inlet of the premixer, and the second air outlet of the air intake assembly is communicated with the first combustion chamber; wherein the content of the first and second substances,

the air intake assembly is used for delivering air to the premixer and the first combustion chamber, and can control the air flow delivered to the first combustion chamber.

Optionally, the air intake assembly comprises:

an air line communicating the air inlet, the first air outlet and the second air outlet;

a first air flow adjustment device disposed on the air line for adjusting the air flow output to the premixer and the first combustor.

Optionally, the first air flow adjustment device is an air flow valve disposed in series between the first air outlet and the premixer;

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

Optionally, the premixer comprises:

an air inlet and a gas inlet;

a venturi tube, a first air inlet of the venturi tube communicating with a first air outlet of the first air flow regulating device, a second air inlet of the venturi tube communicating with the gas inlet;

and the mixing cavity is communicated with the Venturi tube and the first combustion chamber and the second combustion chamber.

Optionally, the intake assembly further comprises:

the fan, the fan establish ties set up in air inlet and with between the venturi.

Optionally, the burner assembly further comprises:

and the flow dividing assembly is arranged between the premixer and the first combustion chamber and is used for dividing the air flow of the premixer and conveying the air flow to the first combustion chamber and the second combustion chamber respectively.

Optionally, the combustion body comprises:

a combustion case in which the first combustion chamber and the second combustion chamber are formed; and

the air inlet shell is covered on one side of the combustion shell and forms the mixing cavity with the combustion shell in an enclosing manner;

the combustion shell is provided with a first air inlet communicated with the mixing cavity and the first combustion chamber and a second air inlet communicated with the mixing cavity and the second combustion chamber.

Optionally, the burner assembly further comprises:

a gas valve disposed between the gas inlet and the venturi.

Optionally, 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.

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

Optionally, the burner assembly further comprises:

and the electric control assembly is electrically connected with the air inlet assembly and used for controlling the air inlet assembly to respectively convey air to the premixer and the first combustion chamber and controlling the air flow conveyed to the first combustion chamber so as to ensure that mixed gas and air are heated to a preset target temperature in the first combustion chamber and then conveyed to the second combustion chamber for high-temperature air combustion.

The invention also provides gas water heating equipment comprising the burner assembly.

Optionally, the gas-fired water heating apparatus further comprises:

and one end of the heat exchanger is communicated with the cold water inlet pipe, the other end of the heat exchanger is communicated with the hot water outlet pipe, and the heat exchanger is used for absorbing heat generated by combustion of the first combustion chamber and the second combustion chamber of the burner assembly and exchanging the absorbed heat with water in the heat exchanger.

The combustor assembly is provided with the air inlet assembly, so that the output air is divided into at least two air flow paths to be output under the air shunting action of the air inlet assembly, one air flow path is output to the premixer, part of the gas and the air are mixed and then enter the first combustion chamber and the second combustion chamber, the other part of the gas is only input into the first combustion chamber, the mixed gas and the air output by the air inlet assembly are combusted in the first combustion chamber to form high-temperature flue gas, the high-temperature flue gas formed by combustion in the first combustion chamber is sucked by the high-speed mixed gas injected in the second combustion chamber, and therefore after the gas injected in the second combustion chamber is diluted with the preheated high-temperature air, the high-temperature air combustion is finally realized, and the emission of CO and NOx of gas water heating equipment is reduced. In the invention, the air inlet assembly is used for completing high-temperature air combustion, after the mixed air is properly distributed to the two-stage combustion chambers, the air inlet assembly can also output another path of air to the first combustion chamber, and more air can be preheated in the first combustion chamber under the condition of certain air-fuel ratio, so that the excess air ratio of the first combustion chamber can be improved, namely more air participates in the combustion of the first combustion chamber and is directly heated, the preheating effect is favorably improved, the water heater is more easily in a high-temperature air combustion state, and the emission of NOx and CO is favorably reduced.

Drawings

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

FIG. 1 is a schematic structural view of an embodiment of a burner assembly of the present invention;

FIG. 2 is a schematic structural view of another embodiment of a burner assembly of the present invention;

FIG. 3 is a functional block diagram of an embodiment of the burner assembly of the present invention;

FIG. 4 is a functional block diagram of another embodiment of a burner assembly of the present invention;

FIG. 5 is a schematic view of a partially exploded structure of the burner of FIG. 1;

FIG. 6 is a partially exploded view of the frame of FIG. 1;

FIG. 7 is a schematic gas flow diagram of an embodiment of the burner assembly of the present invention.

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

The reference numbers illustrate:

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

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

Preheating the MILD intake air and increasing the speed of the MILD intake air are critical in order to create MILD combustion within the combustion chamber of the water heater. Therefore, how to distribute the gas to the two combustion chambers becomes a research direction for realizing high-temperature air combustion.

The invention provides a burner assembly which is suitable for gas water heating equipment and related products and equipment such as a gas wall-mounted boiler and the like which use high-temperature hot water generated by gas combustion for household bathing, heating and the like, and the burner assembly is convenient to understand and is applied to the gas water heating equipment as an example.

Referring to fig. 1 to 7, in an embodiment of the present invention, the burner assembly includes:

a combustion body 100, the combustion body 100 having a first combustion chamber 20 and a second combustion chamber 30 which are communicated in sequence;

a premixer 200, the premixer 200 being used for delivering a mixed gas to the first and second combustion chambers 20 and 30; and the number of the first and second groups,

an intake assembly 300 having an air inlet 31a, a first air outlet 31b and a second air outlet 31c, the air inlet 31a of the intake assembly 300 receiving air, the first air outlet 31b of the intake assembly 300 communicating with the air inlet 31a of the premixer 200, the second air outlet 31c of the intake assembly 300 communicating with the first combustion chamber 20; wherein the content of the first and second substances,

the air intake assembly 300 is used for delivering air to the premixer 200 and the first combustion chamber 20, and is capable of controlling the amount of air flow delivered to the first combustion chamber 20.

It can be understood that the main features of high temperature air combustion are: the chemical reaction needs to take place in a high temperature, low oxygen environment, with the reactants at a temperature above their auto-ignition temperature and the maximum temperature rise during combustion below their auto-ignition temperature, with the oxygen volume fraction being diluted to a very low concentration by the combustion products. Compared with conventional combustion, in the combustion state, the pyrolysis of fuel is inhibited, the flame thickness is thickened, and the flame front surface disappears, so that the temperature of the whole hearth is uniform, the combustion peak temperature is low, the noise is low, and the emission of pollutants NOx and CO is greatly reduced. However, achieving high temperature air combustion requires certain conditions: the oxygen concentration in most areas in the furnace is required to be ensured to be lower than a certain value, generally lower than 5% -10%, the gas is ensured to be fully combusted and uniformly combusted, the temperature is higher than the self-ignition point of the fuel, and the self-ignition is maintained. In addition, the following conditions are also achieved, and the high-temperature preheating of air and the matching of high-speed jet flow are the main modes for realizing high-temperature air combustion; the technical key of maintaining high-temperature air combustion is to entrain high-temperature flue gas and dilute combustion air jet flow, so that the scheme of the invention can realize reasonable gas distribution for the two combustors and realize the purpose of stably performing high-temperature air combustion.

The combustion main body 100 includes a housing formed with the first combustion chamber 20 and the second combustion chamber 30, and in the present embodiment, the shape of the housing of the combustion main body 100 may be square, cylindrical, and the like, and may be selected and designed according to actual requirements, and is not limited in particular. The shell is also provided with a smoke outlet, and after the gas is burnt at high temperature in the second combustion chamber 30, the burnt heat is discharged through the smoke outlet, so that the heat can be exchanged with a heat exchanger of the gas water heating equipment to realize the preparation of hot water. Due to the upward flow characteristic of the flue gas, the second combustion chamber 30 can be positioned at the upper half part of the whole burner assembly 100, and the flue gas is more favorably discharged. And in order to further increase the exhaust rate of the smoke, the upper end of the combustion body 100 is open to form a smoke discharge port. The gas water heating apparatus further includes a preheating burner installed in the first combustion chamber 20; a heat exchanger located between the smoke exhaust and the second combustion chamber 30; the burner assembly further comprises an electric control assembly 500, and the gas water heating device further comprises a water inlet pipe for introducing water into the gas water heating device, a hot water outlet pipe for providing hot water to the outside, a smoke exhaust pipe connected with a smoke exhaust port, a gas inlet pipeline for accessing gas and an air inlet valve. Wherein the preheating burner is used for heating the gas of the MILD combustion chamber. The preheating burner may have a honeycomb structure effective for preventing backfire during combustion, and for example, the gas water heater may further include an igniter for igniting the gas injected from the preheating burner. The gas water heater further includes an electric control assembly 500 for controlling the preheating burner to perform combustion operation when the gas water heater is started, and the gas and air entering the first combustion chamber 20 are ignited and ignited by the preheating burner, so that the mixed gas mixed with the gas and air is combusted to heat the air in the first combustion chamber 20, thereby forming high-temperature flue gas. It is understood that the air in the first combustion chamber 20 can be heated to the target temperature, i.e., the above-mentioned preset temperature, by controlling the heating temperature, so that the high-temperature preheating of the air is realized. After the high-temperature gas subjected to high-temperature preheating is sent into the second combustion chamber 30, the fuel gas is sprayed into the second combustion chamber 30, the fuel gas is combined with the high-temperature gas, and the high-temperature gas ignites the fuel gas, so that MILD combustion is formed in the second combustion chamber 30. Wherein the first combustor 20 is a preheating combustor, and the second combustor 30 is a high temperature air combustor.

In order to improve the combustion efficiency of the burner assembly, one embodiment of the present invention is to mix air and gas when providing air and gas for the first combustion chamber 20 and the second combustion chamber 30, for example, the present invention is applied to a fully premixed gas water heating apparatus, the fully premixed burner assembly is installed in the first combustion chamber, the fan 330 is used to suck air, the air is mixed with gas, and then the mixed gas of gas and air is injected into the first combustion chamber 20 and the second combustion chamber 30.

In another embodiment of the present invention, unmixed gas is provided through different pipelines, and is applied to a strong pumping type gas hot water device, by injecting gas into the first combustion chamber 20 and the second combustion chamber 30, the gas can be sucked by the fan 330211, and then is injected into the combustion chambers respectively. The above-mentioned manner of supplying the first and second combustion chambers 20 and 30 with air and gas is mostly implemented by pipes, and therefore, in a specific application embodiment, the flow rate of the gas and air in the pipes is controlled by installing control valves, such as solenoid valves, on the respective pipes to distribute the gas and air flowing into the first and second combustion chambers 20 and 30. In the present embodiment, the gas delivered to the first combustion chamber 20 and the second combustion chamber 30 is taken as an example of a mixed gas, the premixer 200 has a gas inlet and an air inlet, and the premixer 200 mixes the gas received from the gas inlet and the air output from the air intake assembly 300 and outputs the mixture to the first combustion chamber 20 and the second combustion chamber 30, thereby completing the preheating combustion and the high-temperature air combustion.

In the present embodiment, the air intake assembly 300 is arranged such that, during operation of the burner assembly, the air intake assembly 300 divides the incoming air into two parts to respectively supply air to the pre-mixer 200 and the first combustion chamber 2030, specifically, the air intake assembly 300 supplies a part of air to the pre-mixer 200, so that the pre-mixer 200 mixes the incoming gas with the air and then supplies the mixed gas to the first combustion chamber 20 and the second combustion chamber 30, and the air intake assembly 300 supplies another part of air 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 air required for the combustion of the high-temperature air is completed, so that when the air is injected into the first combustion chamber 2030 through the air intake assembly 300, more air can be preheated in the first combustion chamber 20 to form the high-temperature gas, and the excess air of the high-temperature gas is relatively high and is sufficient for igniting the gas. And forms a entrainment effect in the second combustion chamber 30, and forms a jet combustion zone and a flue gas recirculation zone in the second combustion chamber 30, so that part of the high temperature flue gas (the waste gas rich in N2 and CO 2) circulates and dilutes the reactants in the second combustion chamber 30. Air is added into the first combustion chamber 20 in two ways through the air inlet assembly 300, wherein one way directly leads in air through the air inlet assembly 300, the other way leads in the first combustion chamber 20 and the second combustion chamber 30 after being premixed with fuel gas through the premixer 200, and then most of air required by preheating combustion and high-temperature air combustion is preheated through the first combustion chamber 20. When the mixed gas is introduced into the second combustion chamber 30, the preheated air in the mixed gas is fully diluted by the mixed gas introduced into the second combustion chamber 30 to form a lower oxygen concentration, reduce the combustion reaction speed, maintain the higher temperature of the second combustion chamber 30, ensure the temperature to be higher than the self-ignition point of the fuel, realize self-ignition, and thus realize high-temperature air combustion.

It should be noted that the target temperature of the high-temperature preheated air cannot be too low, and cannot be lower than 600 ℃, and is generally controlled to be 600 to 1200 ℃, so that when the high-temperature gas contacts with the fuel gas in the second combustion chamber 30, better automatic combustion is realized, and ignition are no longer needed. Wherein, the target temperature can be achieved by controlling the heating time, controlling the ratio of the fuel gas and the air, performing heat preservation, increasing the residence time of the high-temperature gas in the first combustion chamber 20, and the like. The injection speed and the flow rate of the fuel gas delivered to the second combustion chamber 30 by the air intake assembly 300 can be adjusted according to requirements, specifically, the injection speed and the flow rate of the fuel gas can be adjusted according to preset temperature, ambient temperature, water intake flow rate, water outlet temperature, ambient pressure, and the like, and the adjustment proportion and the adjustment process can be predetermined and set through experiments.

It is understood that, when the fuel gas and the air are mixed in advance, the premixing device 200 may be used to realize that a part of the mixed gas flows into the first combustion chamber 20 for preheating combustion; and the other part of the mixed gas is injected into the second combustion chamber 30 to be subjected to high-temperature air combustion. Because the mixed gas containing the fuel gas and the air is provided by the pre-mixer 200, the pre-heating burner ignites and burns the mixed gas and the air conveyed by the air inlet assembly 300, high-temperature pre-heating air is realized, when the mixed gas of the fuel gas and the air is conveyed to the second combustion chamber 30, more air can be preheated in the first combustion chamber 20, thereby generating entrainment effect in the second combustion chamber 30, high-temperature flue gas backflow is realized, on one hand, the heat preservation is realized, the temperature is higher than the self-point of the fuel, the fuel gas in the combustion chamber can be spontaneously combusted, on the other hand, the diluted air is entrained by jet flow, the oxygen concentration is lower than a certain value, uniform combustion is realized, so, the high-temperature air combustion in the combustion chamber is realized, the MILD combustion requirement can be reached, and the discharge amount of CO and NOx is reduced. In order to achieve better preheating of air and fuel gas, different air excess coefficients, that is, air excess coefficients, may be set for the first combustion chamber 20 and the second combustion chamber 30, and in this embodiment, air is supplied to the first combustion chamber 20 at least in two portions, and fuel gas flowing to the first combustion chamber 20 and the second combustion chamber 30 is supplied entirely through the premixer 200, so that more air can be preheated by the preheating combustor in the first combustion chamber 20, that is, the air excess coefficient of the first combustion chamber 20 is higher than that of the second combustion chamber 30, so that more air participates in the combustion in the first combustion chamber 20 and is directly heated, and the preheating effect can be improved. The technical scheme of this embodiment is favorable to reaching above-mentioned two conditions that need satisfy that realize MILD burning simultaneously, realizes the high temperature air burning smoothly. And, the structure of this kind of combustor subassembly frame can be with the subassembly miniaturization that realizes the high temperature air burning for have more application space and value, the noise is low in addition, and the burning is abundant, and it is little to discharge waste gas pollution, when being applied to gas hot water equipment and including using gas burning production high temperature hot water such as gas hanging stove to carry out relevant products and equipment that use such as family's shower and heating, not only satisfied the requirement, but also brought the abundant, the low pollutant of burning that the combustor subassembly did not possess in the current water heater effect.

In the embodiment, the air intake assembly 300 is arranged to divide the output air into at least two air flow paths to output under the air dividing effect of the air intake assembly 300, one air flow path is output to the premixer 200, so that a part of the gas and the 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 to the first combustion chamber 20, the mixed gas and the air output by the air intake assembly 300 are combusted in the first combustion chamber 20 to form high-temperature flue gas, and the high-temperature flue gas formed by combustion in the first combustion chamber 20 enters the second combustion chamber 30, so that high-temperature air combustion is realized in the second combustion chamber 30, and the emission of CO and NOx of the gas water heating equipment is reduced.

In the invention, the air intake assembly 300 is used for completing high-temperature air combustion, after the mixed air is properly distributed to the two-stage combustion chambers, the air intake assembly 300 can also output another path of air to the first combustion chamber 20, and more air can be preheated in the first combustion chamber 20 under the condition of a certain air-fuel ratio, so that the excess air ratio of the first combustion chamber 20 can be improved, namely more air participates in the combustion of the first combustion chamber 20 and is directly heated, the preheating effect is improved, a water heater is easier to enter a high-temperature air combustion state, and the lower emission of NOx and CO is favorably realized.

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

an air line 310 that communicates the air inlet 31a, the first air outlet 31b, and the second air outlet 31c;

a first air flow regulator 320 disposed on the air pipe 310, the first air flow regulator 320 being configured to regulate the air flow output to the premixer 200 and the first combustion chamber 20.

In this embodiment, the premixer 200 is communicated with the air intake assembly 300 through a pipeline, a gas passage is further formed in the combustion main body 100, the mixing passage is sequentially communicated with the premixer 200, the gas passage and the air pipeline, and the first gas flow rate adjusting device can adjust the gas flow rate output to the premixer 200 and the second combustion chamber 30. Specifically, the first air flow adjusting device 320 may control on/off of air output to the premixer 200 and the first combustion chamber 20, may adjust the size of the air flow output to the premixer 200 and the first combustion chamber 20, and may also adjust the proportion of the air output to the premixer 200 and the first combustion chamber 20, which may be specifically set according to actual requirements, and is not limited herein. The excess air ratio of the first combustion chamber 20 can be adjusted by the first air flow adjusting device 320, so that the air and the fuel gas can be well preheated under the condition that the air-fuel ratio is not changed, and the air and the fuel gas can be better brought into a high-temperature air combustion state.

Referring to fig. 1 to 4, in an embodiment, the first air flow regulating device 320 is an air flow valve 321, the air flow valve 321 being arranged in series between the first air outlet 31b and the premixer 200;

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

In this embodiment, the airflow valve 321 may be located between any of the two air lines 310. Specifically, the airflow valve 321 may be disposed in series between the air intake port 31a and the premixer 200, or between the air intake port 31a and the first combustion chamber 20, and the opening degree of the airflow valve 321 may be adjusted at different thermal loads, so as to achieve different excess air coefficients and achieve the purpose of good preheating effect. The airflow valve 321 may be an electromagnetic valve having only an opening/closing type, or may be an airflow valve 321 that adjusts different opening degrees. A higher excess air ratio in the first combustion chamber 20 can be achieved.

The air flow rate ratio outputted to the premixer 200 and the first combustion chamber 20 can be adjusted by adjusting the opening degree of the airflow valve 321, and for example, when the airflow valve 321 is provided between the air intake port 31a and the first combustion chamber 20, the opening degree of the airflow valve 321 is increased, the hole air ratio outputted to the first combustion chamber 20 is increased, and the air ratio outputted to the premixer 200 is decreased. Conversely, when the opening degree of the airflow valve 321 is decreased, the ratio of the air output to the first combustion chamber 20 is decreased, and the ratio of the air output to the premixer 200 is increased. Similarly, when the airflow valve 321 is provided between the air intake port 31a and the premixer 200, the air ratio of the premixer 200 and the first combustion chamber 20 can also be adjusted. In this way, it is possible to ensure that the air flow rates output to the first combustion chamber 20 and the second combustion chamber 30 can satisfy the demand for the warm-up combustion in the first combustion chamber 20 and the high-temperature air combustion in the second combustion chamber 30, and the air excess ratio in the first combustion chamber 20 is increased.

Referring to fig. 3 and 4, in one embodiment, the premixer 200 includes:

an air inlet and a gas inlet;

a venturi tube 210, a first air inlet of the venturi tube 210 communicating with the first air outlet 31b of the first air flow regulating device 320, a second air inlet of the venturi tube 210 communicating with the gas inlet;

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

In this embodiment, the burner assembly may further include a gas pipeline, the venturi 210 is located between the air pipeline 310 and the gas pipeline, and the mixing chamber 10, and the venturi 210, the air pipeline 310 and the gas inlet pipe together form the premixer 200 communicating with the mixing chamber 10. Air may enter the venturi 210 from the inlet of the air line 310 and form a vortex of air at the outlet of the venturi 210. But the gas that the air vortex was inhaled by the gas intake pipe entrainment to make gas and air carry out the intensive mixing in venturi 210, the gas of intensive mixing like this and the mist of air can realize abundant burning in gas hot water equipment, thereby can improve combustion efficiency, and can reduce the production of harmful substance such as nitrogen oxide (NOx) and carbon monoxide. In the present embodiment, the venturi 210 communicates with the air inlet and the mixing chamber 10 to output the mixed gas to the first and second combustion chambers 20 and 30.

Referring to fig. 3 and 4, in one embodiment, the intake assembly 300 further includes:

a fan 330, the fan 330 being serially disposed between the air inlet and the venturi 210.

In this embodiment, the gas and the air can enter the venturi structure first, and the mixture enters the fan 330 again for mixing, so this fan 330 needs to use the explosion-proof fan 330 for the air gas has better mixed effect. Alternatively, the blower 330 may be disposed before the venturi device, and the blower 330 may use a common blower 330 to draw air into the venturi 210 through the blower 330 to mix the air and the fuel gas in the venturi 210. The fan 330 adjusts the rotation speed to provide air or mixed gas with corresponding flow rate for the burner assembly under different working conditions, such as different heat load requirements, based on the control of the electric control assembly 500, so as to complete high-temperature air combustion.

Referring to fig. 3 and 4, in an embodiment, the burner assembly further comprises:

and a flow dividing assembly 400 disposed between the premixer 200 and the first combustion chamber 20, wherein the flow dividing assembly 400 is configured to divide the gas flow of the premixer 200 and deliver the gas flow to the first combustion chamber 20 and the second combustion chamber 30, respectively.

In the present embodiment, under the shunting action of the shunting assembly 400, a part of the gas enters the first combustion chamber 20 through the shunting assembly 400 for combustion; another portion of the gas is blocked by the flow splitting assembly 400 and is injected downward into the second combustion chamber 30 for combustion from a two-sided turbulent flow. In this way, during the operation of the burner assembly, since the mixed gas containing the gas and the air is provided through the pre-mixer 200, the pre-heating burner performs ignition combustion on the mixed gas, so as to preheat the air at a high temperature, the flow dividing assembly 400 divides the gas delivered from the mixing chamber 10 to deliver the gas to the first combustion chamber 20 and the second combustion chamber 30, respectively, so as to complete preheating of the gas and the air when delivering the gas to the first combustion chamber 20.

In one embodiment, due to the structural design of the flow dividing assembly, the second combustion chamber can reach the condition of high-temperature air combustion under the condition of not separately injecting fuel gas; in other embodiments, in order to better promote the combustion of high-temperature air, the combination of the fuel gas and the high-temperature gas can be completed by separately injecting the fuel gas into the second combustion chamber 30, so that the high-temperature gas ignites the fuel gas, and a entrainment effect is formed in the second combustion chamber 30, so that a spray combustion area and a flue gas recirculation area are formed in the second combustion chamber 30, so that part of the high-temperature flue gas circulates and dilutes the reactant in the second combustion chamber 30, and then the injected fuel gas and the air are sufficiently diluted to form a lower oxygen concentration, thereby reducing the combustion reaction speed, maintaining the higher temperature of the second combustion chamber 30, ensuring the temperature to be higher than the spontaneous combustion point of the fuel, and realizing spontaneous combustion. The electronic control assembly 500 may also control the preheat burner to cease operation when the MILD burner assembly temperature reaches above the MILD combustion light-off temperature while MILD combustion is occurring.

Referring to fig. 5-7, in one embodiment, the flow diversion assembly 400 includes:

a flow divider 410 including a baffle 411 disposed between the air intake chamber 10 and the first combustion chamber 20, wherein the baffle 411 is provided with a plurality of air holes 411a to form a first flow path for the gas in the air intake chamber 10 to flow into the first combustion chamber 20;

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

In this embodiment, as shown in fig. 5, a dashed line in fig. 5 indicates that the gas flowing out from the intake chamber 10 forms at least two flow paths under the action of the baffle 411, the baffle 411 may extend into the intake chamber 10, a gap is formed between the baffle 411 and the wall of the intake chamber 10, an air hole 411a is arranged in the middle of the baffle 411 or at a position corresponding to the first combustion chamber 20, and the gas output from the intake chamber 10 flows into the first combustion chamber 20 under the action of the air hole 411a to provide the air and the fuel gas required for preheating combustion for the first combustion chamber 20. A gas flow path which at least flows into the second combustion chamber 30 is defined between the side edge of the baffle 411 and the cavity wall of the air inlet cavity 10, and under the turbulent flow effect of the baffle 411, gas flows into the second combustion chamber 30 through a second flow path which is formed between the side edge of the baffle 411 and the cavity wall of the air inlet cavity 10, so that air and fuel gas required by high-temperature air combustion are provided for second combustion. The number, position, and aperture of the air holes 411a of the baffle 411, and the area of the baffle 411 may be set according to the type of the gas water heater, so as to adjust the distribution of the gas flow rate flowing to the first combustion chamber 20 and the second combustion chamber 30, thereby achieving the mld combustion state.

Referring to fig. 5 to 7, in an embodiment, a plurality of side plates 412 surround a side of the baffle 411 facing the intake chamber 10.

In this embodiment, the plurality of plates are disposed on one side of the baffle 411 facing the intake chamber 10, that is, on one side facing away from the first combustion chamber 20, the number of the side plates 412 may be two or four, when two side plates are disposed, two side plates 412 are disposed on two opposite sides of the side of the baffle 411, and when four side plates are disposed, four side plates 412 are disposed on four sides of the baffle 411. The height of the baffle 411 is adjustable, and the flow rate of the gas flowing into the second combustion chamber 30 is smaller as the height of the baffle 411 is higher, and the flow rate of the gas flowing into the second combustion chamber 30 is larger as the height of the baffle 411 is lower, so that the gas flow rate distribution ratio to the first combustion chamber 20 and the second combustion chamber 30 can be adjusted.

Referring to fig. 5-7, in an embodiment, the flow diversion assembly 400 further comprises:

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

Specifically, the spoiler 420 is a porous spoiler, a plurality of spoiler through holes are formed in the porous spoiler, and the diameters of the spoiler through holes are smaller than the diameters of the air holes 411a of the splitter 410.

In this embodiment, the spoiler 420 may be implemented by a multi-hole spoiler or a comb-shaped structure, and in this embodiment, the spoiler 420 is selected to be a multi-hole spoiler, so that the gas flowing into the first combustion chamber 20 is more uniform, thereby ensuring that the gas can be uniformly mixed with the mixed gas and air in each region of the first combustion chamber 20. The aperture of the turbulent flow through hole is smaller than the aperture of the air hole 411a of the flow divider 410, the ratio of the aperture of the turbulent flow through hole to the aperture of the flow divider 410 is adjustable, and the distribution ratio of the gas flow to the first combustion chamber 20 and the second combustion chamber 30 can be adjusted by adjusting the aperture of the multi-hole turbulent flow plate. When the aperture of the turbulent flow through hole is larger, the flow rate of the gas flowing into the first combustion chamber 20 is larger, so that the gas is more uniform, and the velocity of the flow velocity of the gas flowing into the first combustion chamber 20 can be faster. When the aperture of the turbulent flow through hole is smaller, the gas flowing into the first combustion chamber 20 is more uniform, the speed of the gas flowing to the first combustion chamber 20 is also blocked, and the residence time of the gas in the gas inlet chamber is increased, so that more gas flows to the second combustion chamber 30. Wherein, the air hole 411a and the spoiler through hole of the splitter 410 can be set as circular through holes, or square through holes, or bar-shaped through holes, and the air hole 411a and the spoiler through hole of the splitter 410 can be set as the same or different.

Referring to fig. 5-7, in an embodiment, the burner assembly further comprises:

and a preheating burner mounted to the first combustion chamber 20 formed in the main body, for delivering the ignited mixture gas to the first combustion chamber 20 of the burner 100 and preheating the first combustion chamber 20 to a target temperature. Wherein, the preheating combustor includes: a porous medium burner 430 disposed between the spoiler 300 and the first combustion chamber 20.

In this embodiment, a porous medium 430 combustion method is adopted, and a porous medium burner 430 is disposed 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 a radiation and heat conduction mode, strong heat exchange of high-temperature flue gas is realized between the heat exchange tube at the periphery of the heat exchange tube and the porous medium 430, and meanwhile, the flue gas can be quenched to directly condense water vapor on the tube wall of the heat exchanger, so that the heat exchange of the flue gas and water is facilitated, the exhaust gas temperature of the combustion chamber is greatly reduced, the latent heat of the water vapor in the flue gas can be collected, and the heat efficiency is improved. The porous medium 430 may be a porous medium 430 material made of metal fibers, and has good heat conductivity and mechanical strength, which is beneficial to heat return, combustion space reduction and combustion strength and heat exchange strength enhancement.

Referring to fig. 1 and 2, in an embodiment, the combustion body 100 includes:

a combustion case 110 in which the first combustion chamber 20 and the second combustion chamber 30 are formed; and

the air inlet shell 120 is covered on one side of the combustion shell 110, and the air inlet shell 120 and the combustion shell 110 enclose to form the mixing chamber 10;

the combustion housing 110 is provided with a first air inlet communicating the mixing chamber 10 and the first combustion chamber 20 and a second air inlet communicating the mixing chamber 10 and the second combustion chamber 30.

In the present embodiment, the intake housing 120 may be a housing of the premixer 200, and the premixer 200 may be fitted into the intake housing 120, or the intake housing 120 may be formed as a gas distribution chamber. The combustion housing 110 forms the first combustion chamber 20 and the second combustion chamber 30, and at the same time, the heat exchanger 600 of the gas water heating device can also be assembled into the combustion housing 110, and the combustion housing 110 and the air intake housing 120 can be directly and fixedly connected by means of screws, buckles and the like. Under the shunting action of the shunting assembly 400, the gas in the mixing chamber 10 flows to the first air inlet and the second air inlet respectively, so that the air and the gas required for preheating combustion are provided to the first combustion chamber 20 through the first air inlet, and the air and the gas required for high-temperature air combustion are improved to the second combustion chamber 30 through the second air inlet.

Referring to fig. 5 to 7, in an embodiment, the combustion casing 110 includes:

a frame portion 111 having a first side and a second side opposite to each other, wherein the first combustion chamber 20 and the second combustion chamber 30 are sequentially disposed from the first side to the second side, the first side of the frame portion 111 is a frame opening, and at least one side frame of the frame portion 111 is provided with a gas connector 1114; and

a fixing plate 112, wherein the fixing plate 112 is covered on a first side of the housing 111, and the air inlet housing 120 is covered on a side of the fixing plate 112 facing away from the housing 111; the first gas inlet 121a is disposed at a position of the fixing plate 112 corresponding to the first combustion chamber 20, the second gas inlet 121b is disposed at a position of the fixing plate 112 corresponding to the gas connector 1114, and the gas connector 1114 is communicated with the gas inlet cavity 10 and the second combustion chamber 30.

In this embodiment, the first side of the housing 111 is fixedly connected to the air intake housing 120, the fixing plate 112 is sandwiched between the housing 111 and the air intake housing 120, the housing 111 may be provided with a screw hole, the air intake housing 120 and the fixing plate 112 are provided with a through hole at corresponding positions, and a screw passes through the through holes of the air intake housing 120 and the fixing plate 112 and is installed in the screw hole of the housing 111, so that the air intake housing 120, the fixing plate 112 and the housing 111 are fixed by the screw. The fixing plate 112 is covered on the frame opening, and at least two air inlets, that is, a first air inlet 121a and a second air inlet 121b, are disposed on the fixing plate 112, and further, a mounting portion is formed by protruding the fixing plate 112 to the first combustion chamber 20 corresponding to the peripheral edge of the first air inlet 121a, so that the spoiler 420 and the porous medium 430 are fixedly mounted. The size of the mounting portion, that is, the aperture of the first air inlet 121a, may be set according to the areas of the spoiler 420 and the porous medium 430.

Referring to fig. 5 and 6, in an embodiment, the heat exchanger assembly 1 includes a first end cap 1111, a second end cap 1112 and a peripheral side plate 1113 connecting the first end cap 1111 and the second end cap 1112, the first end cap 1111 forms a first water chamber 111a therein, the second end cap 1112 forms a second water chamber 111b therein, and the first water chamber 111a and the second water chamber 111b are connected in series with each other through at least one heat absorbing pipe 500 to form a series water path.

In this embodiment, the water passage may be formed by providing the heat absorbing pipe 500, or the water passage may be designed inside the combustion body 100. The water running passage may be formed entirely by the passage in the heat absorbing pipe 500 or entirely by the passage in the combustion body 100. It is also possible to have the water running channel formed partly by the channel in the heat absorbing pipe 500 and partly by the channel in the combustion body 100. The flow path of the water passage may extend only along a part of the wall surface of the combustion body 100, may be provided around the peripheral wall surface of the combustion body 100, or may be provided around the wall surface of the combustion body 100 in a spiral shape or in multiple layers. The flow path of the water passage is not particularly limited, and can be selected and designed according to actual requirements. By forming the first water chamber 111a in the first end cap 1111 and the second water chamber 111b in the second end cap 1112 and forming the water passing channel by connecting the heat absorbing pipes 500 in series with each other, the heat of the combustion body 100 and the heat of the first and second combustion chambers 20 and 30 can be taken away by the water flowing in the water passing channel and the heat of the combustion body 100 can be absorbed by the water, so that the effect of absorbing the heat of the combustion body 100 and the combustion chamber 11 by the whole water passing channel is better. The heat absorbing pipe 500 may be a straight pipe extending along the length direction of the combustion body 100. Through making form first water cavity 111a in the first end cover 1111, form second water cavity 111b in the second end cover 1112, then when not influencing the result of use of end cover, make full use of the interior space of end cover for the water route flows through inside first end cover 1111 and the second end cover 1112, makes the holistic cooling area bigger. Moreover, the heat absorbing pipe 500 is located in the combustion chamber 11, so that the heat exchange rate between the heat absorbing pipe 500 and the airflow in the combustion chamber 11 can be improved, the temperature in the combustion chamber 11 can be sufficiently reduced, heat radiation to the outside of the burner assembly 100 can be prevented, and the generation of pollutants can be reduced. The heat absorbing tube 500 should be made of a material with high temperature resistance and good heat conductivity. The first end cover 1111 is defined by a first sub-end cover 1111a and a first sub-end cover 1111b, and the first sub-end cover 1111a and the second sub-end cover 1111b define a first water chamber 111a. Similarly, the first end cap 1112 is enclosed by the second sub-end cap 1112a and the second sub-end cap 1112b, and the second sub-end cap 1112a and the second sub-end cap 1112b enclose to form the first water chamber 111b.

Referring to fig. 5 and 6, in an embodiment, the number of the peripheral side plates 1113 is two, and the two peripheral side plates 1113 are arranged oppositely;

the two peripheral side plates 1113 are respectively provided with a communicating gas connector 1114.

In this embodiment, the mld intake cavities 10, i.e., the gas connectors 1114, are disposed on both the two peripheral side plates 1113, and the gas connectors 1114 and the combustion main body 100 may be integrally formed or may be separately formed. When the gas connecting piece 1114 is separately arranged, the gas connecting piece and the combustion main body 100 can be fixedly connected by means of screws, welding and the like. By forming the docking passage in the gas docking member 1114, gas output from the intake chamber 10 is enabled to flow from the second flow path formed by the flow divider assembly 400 and the wall of the intake chamber 10 into the second combustion chamber 30. The gas interface 1114 extends along the length of the combustion body 100. The gas connector 1114 has a tubular body disposed with an opening (inlet 1114 a) facing one side of the air intake chamber 10, the inlet 1114a disposed facing the air intake chamber 10 is used for receiving the gas output from the air intake chamber 10, and at least one outlet on the other side of the tubular body, the outlet is communicated with the second combustion chamber 30. Two gas connectors 1114 are provided on both sides of the combustion body to deliver gas to the second combustion chamber 30 from both sides, which may make the gas flow into the second combustion chamber 30 more uniform. Of course, in other embodiments, the number of the gas connectors 1114 may be set to one, and is not limited herein.

Referring to fig. 5 and 6, in an embodiment, the gas connector 1114 is provided with a plurality of gas holes 1114b near one end of the second combustion chamber 30 for gas to flow into the second combustion chamber 30.

In this embodiment, after the gas that gets into from gas connection member 1114 is disturbed the flow by a plurality of gas holes 1114b, establish gas injection to second combustion chamber 30, the injection flow of a plurality of gas holes 1114b is more even, and can guarantee the gas velocity of flow that every gas hole 1114b sprays, and then realize that whole second combustion chamber 30's burning is more stable, in order to realize the entrainment high temperature flue gas and dilute, make second combustion chamber 30 gas and air misce bene, the oxygen concentration of second combustion chamber 30 also can be balanced like this, and be less than a definite value, not only the gas can obtain abundant burning during the burning, just so reduced the emission of pollutant, and, the gas also can the burning in the second combustion chamber 30 is even, the problem of local combustion too prosperous and noise production can not appear. In addition, the high-speed jet entrainment is realized through the gas holes 1114b on the two sides, the backflow of high-temperature flue gas is also realized, the temperature of the second combustion chamber 30 can be kept higher than the self-ignition point of fuel, and the combustion can be maintained as long as the gas is continuously introduced. The heat after combustion can exchange heat with the heat exchanger 50 of the gas water heating device to realize the production of hot water. All set up gas through both sides on burning main part 100 width direction and plug into piece 1114, and make a plurality of gas holes 1114b of two gas plug into piece 1114 arrange in proper order on the length direction of burning main part 100, then can follow the relative both sides injection gas of burning main part 100 and/or air to the second combustion chamber 30 in, improve gas injection volume on the one hand, on the other hand makes the mist evenly distributed who is favorable to gas and air in the combustion chamber, combine to burn with high temperature air fully.

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

A gap α is formed between the flow divider 410 and the fixed plate 112, and the gap is a flow path through which the gas in the intake chamber 10 flows into the first combustion chamber 20.

In this embodiment, the gap β formed between the flow divider 410 and the inner sidewall of the intake housing 120 is the second flow path, and the gap formed between the flow divider 410 and the fixing plate 112 is the flow path flowing into the first combustion chamber 20, that is, the gas output from the intake cavity 10 flows to the flow divider 410, and a part of the gas directly flows to the porous spoiler through the porous structure on the flow divider 410 and enters the first combustion chamber 20 through the porous medium 430 for combustion; another portion of the gas is blocked by the flow splitter 410, swirls downward from both sides, and is split again at the junction of the fixed plate 112 and the combustion housing 110, a portion flows toward the perforated spoiler and enters the first combustion chamber 20 through the porous medium 430 for combustion, and another portion is injected into the second combustion chamber 30 for combustion through the gas connector 1114, i.e., the MILD intake chamber 10. Of course, in other embodiments, the baffle 411 may not be provided with the air holes 411a, and if no hole is formed in the baffle, the gas is disturbed to the peripheral side of the baffle 411 by the baffle 411 after flowing from the inlet of the gas inlet chamber 10. The flow distribution of the gases to the first and second combustion chambers 20, 30 can be adjusted by adjusting the size of the baffle 411, the number and distribution of the holes in the flow splitter 410, the distance α between the baffle and the intake housing 120, the distance β between the baffle and the fixed plate 112, and the size γ of the opening of the mld intake chamber 10 to achieve the mld combustion state. The distance between the flow splitter 410 and the inner side wall of the air intake housing 120 is adjustable. The distance between the flow diverter 410 and the fixed plate 112 is adjustable.

In an embodiment, the baffle 411 may be driven by a driving member to move, so as to adjust a relative distance between the baffle 411 and the fixed plate 112, and adjust a relative distance α between the baffle 411 and the air intake housing 120, thereby adjusting the gap size and achieving distribution of the gas flow.

Referring to fig. 3 and 4, in an embodiment, the burner assembly further comprises:

a gas valve 220, the gas valve 220 being disposed between the gas inlet and the venturi tube 210.

In this embodiment, the gas valve 220 may be an electromagnetic valve having only an open/close type, or may be a gas proportional valve that adjusts different opening degrees. The gas valve 220 is disposed between the gas inlet and the premixer 200, the opening degree of the gas valve 220 is adjustable, and the gas flow rate delivered to the first combustion chamber 20 and the second combustion chamber 30 can be adjusted by adjusting the opening degree of the gas valve 220, for example, when the opening degree of the gas valve 220 is increased, the gas amount output to the premixer 200 and the second combustion chamber 30 is increased.

Referring to fig. 3 and 4, in an embodiment, the number of gas passages formed between the second air outlet 31c of the first air flow regulator 320 and the first combustion chamber 20 is multiple.

In this embodiment, the first air flow adjusting device 320 is connected to the first combustion chamber 20 through a gas pipeline, and the number of the gas pipelines between the first air flow adjusting device 320 and the first combustion chamber 20 may be two or more, for example, the gas pipelines are disposed on two opposite sides of a gas casing, so that the air output to the first combustion chamber 20 is more uniform, and the combustion effect of high-temperature air combustion is improved.

Referring to fig. 3 and 4, in an embodiment, the burner assembly further comprises:

and the electronic control assembly 500 is electrically connected with the air intake assembly 300 and is used for controlling the air intake assembly 300 to respectively convey air to the premixer 200 and the first combustion chamber 20 and controlling the air flow conveyed to the first combustion chamber 20, so that the mixed gas and the air are heated to a preset target temperature in the first combustion chamber 20 and then conveyed to the second combustion chamber 30 for high-temperature air combustion.

In this embodiment, the electronic control assembly 500 includes an electronic control board, and a burner assembly control circuit disposed on the electronic control board, and the burner assembly control circuit can be realized by using a main controller, a gas valve driving circuit, a fan driving circuit, a gas proportional valve driving circuit, etc., wherein the gas valve driving circuit, the fan driving circuit, and the gas proportional valve driving circuit can be realized by using a driving circuit composed of power tubes such as a relay, a MOS transistor, and an IGBT. The main controller can receive control instructions input by a user through a wireless communication circuit, such as a Bluetooth module, an infrared induction circuit, a WIFI module and the like, and controls the work of the burner assembly according to the corresponding control instructions so as to meet the water demand of the user.

The invention also provides gas water heating equipment. The gas-fired water heating equipment comprises the burner assembly, and the heat exchanger is used for preparing hot water by the heat generated by the burner assembly. The detailed structure of the burner assembly can refer to the above embodiments, and is not described herein; it can be understood that, because the burner assembly is used in the gas water heater of the present invention, the embodiment of the gas water heater of the present invention includes all technical solutions of all embodiments of the burner assembly, and the achieved technical effects are also completely the same, and are not described herein again.

In an embodiment, the gas-fired water heating apparatus further comprises:

and the heat exchanger (not shown) is communicated with a cold water inlet pipe at one end and a hot water outlet pipe at the other end, and is used for absorbing heat generated by combustion of the first combustion chamber 20 and the second combustion chamber 30 of the burner assembly and exchanging the absorbed heat with water in the heat exchanger.

In this embodiment, the cold water inlet pipe is used for introducing cold water to the gas water heating device from the outside, and sending the cold water into the heat exchanger, the heat exchanger absorbs heat generated by combustion of the preheating burner and combustion of the MILD and then heats the cold water into hot water, and the hot water is led out of the gas water heating device through the hot water outlet pipe.

The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (13)

1. A burner assembly, comprising:

the combustion device comprises a combustion main body, a first combustion chamber and a second combustion chamber, wherein the first combustion chamber and the second combustion chamber are sequentially communicated;

the premixer is used for conveying mixed gas to the first combustion chamber and the second combustion chamber; and the number of the first and second groups,

the air inlet assembly is provided with an air inlet, a first air outlet and a second air outlet, the air inlet of the air inlet assembly is connected with air, the first air outlet of the air inlet assembly is communicated with the air inlet of the premixer, and the second air outlet of the air inlet assembly is communicated with the first combustion chamber; wherein the content of the first and second substances,

the air intake assembly is used for delivering air to the premixer and the first combustion chamber, and can control the air flow delivered to the first combustion chamber.

2. The burner assembly of claim 1, wherein the air intake assembly comprises:

an air line communicating the air inlet, the first air outlet and the second air outlet;

a first air flow adjustment device disposed on the air line, the first air flow adjustment device for adjusting the air flow output to the premixer and the first combustion chamber.

3. The burner assembly of claim 2 wherein the first air flow adjustment device is an air flow valve disposed in series between the first air outlet and the premixer;

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

4. The combustor assembly of claim 3, wherein the premixer comprises:

an air inlet and a gas inlet;

the first air inlet of the Venturi tube is communicated with the first air outlet of the first air flow adjusting device, and the second air inlet of the Venturi tube is communicated with the fuel gas inlet;

and the mixing cavity is communicated with the Venturi tube, the first combustion chamber and the second combustion chamber.

5. The burner assembly of claim 4, wherein the air intake assembly further comprises:

the fan, the fan establish ties set up in air inlet and with between the venturi.

6. The burner assembly of claim 4, further comprising:

and the flow dividing assembly is arranged between the premixer and the first combustion chamber and is used for dividing the air flow of the premixer and conveying the air flow to the first combustion chamber and the second combustion chamber respectively.

7. The burner assembly of claim 6, wherein the combustion body comprises:

a combustion case in which the first combustion chamber and the second combustion chamber are formed; and

the air inlet shell is covered on one side of the combustion shell and forms the mixing cavity with the combustion shell in an enclosing manner;

the combustion shell is provided with a first air inlet communicated with the mixing cavity and the first combustion chamber and a second air inlet communicated with the mixing cavity and the second combustion chamber.

8. The burner assembly of claim 4, further comprising:

a gas valve disposed between the gas inlet and the venturi.

9. The burner assembly of claim 2 wherein the number of gas passages formed between the second air outlet of the first air flow regulator and the first combustion chamber is multiplexed.

10. The burner assembly of claim 1 wherein the first combustion chamber is a preheat combustion chamber and the second combustion chamber is a high temperature air combustion chamber.

11. The burner assembly of any of claims 1-10, further comprising:

and the electric control assembly is electrically connected with the air inlet assembly and used for controlling the air inlet assembly to respectively convey air to the premixer and the first combustion chamber and controlling the air flow conveyed to the first combustion chamber so as to ensure that mixed gas and air are heated to a preset target temperature in the first combustion chamber and then conveyed to the second combustion chamber for high-temperature air combustion.

12. A gas-fired water heating apparatus comprising a burner assembly according to any one of claims 1 to 11.

13. The gas-fired water heating apparatus of claim 12, further comprising:

and one end of the heat exchanger is communicated with the cold water inlet pipe, the other end of the heat exchanger is communicated with the hot water outlet pipe, and the heat exchanger is used for absorbing heat generated by combustion of the first combustion chamber and the second combustion chamber of the burner assembly and exchanging the absorbed heat with water in the heat exchanger.

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