CN216619817U - Combustor and water heater - Google Patents

Abstract

The utility model discloses a burner and a water heater, wherein the burner comprises: the combustor comprises a combustor main body, a first combustion chamber and a second combustion chamber, wherein the combustor main body is provided with the first combustion chamber and the second combustion chamber which are communicated in sequence; the pre-distribution device is arranged on the burner main body and is used for introducing gas and air to form mixed gas; the preheating combustion device is arranged on the burner main body and used for accessing the mixed gas input by the pre-distribution device and inputting the mixed gas into the first combustion chamber for preheating combustion; the gas injection assembly is arranged on the burner main body; and the air supplementing device is arranged on the burner main body, is communicated with the gas injection assembly and is used for inputting fuel gas to the gas injection assembly so as to enable the air-fuel ratio of the mixed gas output by the preheating combustion device to be unequal to that of the mixed gas output by the gas injection assembly. The utility model adjusts the air-fuel ratio of the gas injection assembly to realize the adjustment of the air-fuel ratio according to the combustion condition.

Description

Burners and Water Heaters

technical field

The utility model relates to the field of water heaters, in particular to a burner and a water heater.

Background technique

When the existing water heater is running, the gas supply required by the water heater is limited by the gas valve. The supply of gas and air is usually a constant state. When the water heater switches between different operating states, the gas volume required by the burner is different, and the constant state The lower gas supply will cause the combustion efficiency of the gas to be affected, and some of the gas will not be fully burned, resulting in an increase in the amount of harmful gases in the flue gas and a reduction in the effective utilization of the gas.

Utility model content

The main purpose of the utility model is to propose a burner and a water heater, aiming at improving the problem of low gas utilization rate caused by the unreasonable air-fuel ratio of the existing water heater.

In order to achieve the above-mentioned purpose, the burner proposed by the present utility model includes:

a burner main body, the burner main body is formed with a first combustion chamber and a second combustion chamber which are communicated in sequence;

a pre-distribution device, arranged on the burner body, for connecting gas and air to form a mixed gas;

A preheating combustion device is arranged on the main body of the burner, and is used to connect the mixed gas input by the pre-distribution device and input the mixed gas to the first combustion chamber for preheating combustion, so as to form high-temperature flue gas and transport it to the first combustion chamber. the second combustion chamber;

a gas injection assembly, arranged on the main body of the burner, for accessing the mixed gas input from the pre-distribution device and delivering it to the second combustion chamber, so that the combustion reaction of high temperature air is carried out in the second combustion chamber; and

a gas supplement device, which is arranged on the main body of the burner and communicates with the gas injection assembly, and is used for inputting fuel gas to the gas injection assembly, so that the mixed gas output by the preheating combustion device can be mixed with the gas injection assembly The air-fuel ratio of the output mixture is not equal.

Optionally, the pre-dispensing device includes:

The premixer is arranged on the main body of the burner and is used for connecting gas and air to form a mixed gas. The preheating combustion device and the gas injection assembly are respectively communicated with the premixer.

Optionally, the pre-distribution device further includes:

A pre-distribution chamber is provided on the main body of the burner and connected to the pre-mixer, and the preheating combustion device and the gas injection assembly are respectively connected to the pre-mixer through the pre-distribution chamber.

Optionally, the gas injection assembly includes:

a casing, disposed on the main body of the burner, a gas distribution chamber is formed in the casing, the air supplement device is connected with the gas distribution chamber, and the casing is communicated with the pre-distribution device; and

A nozzle is provided in the casing and communicates with the gas distribution chamber, and the nozzle is used for injecting gas into the second combustion chamber.

Optionally, the number of the nozzles is multiple, and the multiple nozzles are arranged on the housing at intervals.

Optionally, the gas injection assembly further includes:

A connecting assembly is provided on the burner main body and used to communicate the pre-distribution device and the gas distribution chamber.

Optionally, the connection assembly includes:

a first connecting section, which is arranged on the burner main body, and a first airflow channel that communicates with the pre-distribution device is formed in the first connecting section; and

A second connection section, the first connection section communicates with the housing through the second connection section, a second air flow channel is formed in the second connection section, and the first air flow channel passes through the second connection section The airflow channel is communicated with the gas distribution chamber, and the second connection section is arranged at a distance from the burner main body.

Optionally, the gas distribution chamber has a first end close to the nozzle and a second end away from the nozzle, and an end of the second airflow channel away from the first airflow channel is connected to the gas distribution chamber. The second end is connected.

Optionally, the burner further includes:

The gas valve is arranged on the main body of the burner, the pre-distribution device has an air inlet and a gas inlet, and the gas inlet of the pre-distribution device and the gas supplement device are respectively connected to the gas valve.

The utility model also proposes a water heater, comprising:

body;

The burner as described above, provided in the body; and

The heat exchanger is arranged on the body and communicated with the second combustion chamber of the burner.

Optionally, the water heater further includes:

a temperature sensor for the temperature within the second combustion chamber; and

a controller, electrically connected to the body and the temperature sensor, for acquiring the temperature in the second combustion chamber and the heat load required by the water heater; and for acquiring the temperature in the second combustion chamber when the temperature in the second combustion chamber reaches a preset When the temperature is set, the gas injection assembly is controlled to inject gas into the second combustion chamber, so that the second combustion chamber is burned with high-temperature air, so as to achieve the required heat load range of the water heater.

The technical solution of the utility model is to supply the mixed gas of fuel gas and air to the preheating combustion device and the gas injection assembly by using the pre-distribution device, so as to supply the gas with the preset air-fuel ratio to the preheating combustion device; gas or air, to adjust the air-fuel ratio of the gas injection assembly, so that the air-fuel ratio of the gas required for combustion in the first combustion chamber and the second combustion chamber is different, so that the combustion conditions in the first combustion chamber and the second combustion chamber can be adjusted according to the combustion conditions of the first combustion chamber and the second combustion chamber Adjust the air-fuel ratio to improve the utilization efficiency of gas and improve the combustion energy efficiency of the burner.

Description of drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are just some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained based on the structures shown in these drawings without any creative effort.

1 is a schematic structural diagram of an embodiment of the use state of the burner of the present invention;

Fig. 2 is the left side view of Fig. 1;

Fig. 3 is the sectional view of A-A in Fig. 1;

4 is a schematic structural diagram of an embodiment of the gas injection assembly of the present invention;

FIG. 5 is a schematic structural diagram of an embodiment of the internal structure of the gas injection assembly of the present invention.

Description of reference numbers:

label name label name 10 body 11 Heat Exchanger 12 heat exchange tube 13 fume hood 14 Exhaust pipe 15 Temperature Sensor 20 pre-dispensing device twenty one premixer twenty two Gas import twenty three air inlet twenty four pre-allocation room 30 Preheat burner 40 Air supplement 50 Gas injection components 51 case 52 gas distribution chamber 53 nozzle 54 first link 55 first air passage 56 second link 57 second airflow channel 60 gas valve 61 first control valve 62 second control valve 70 first combustion chamber 80 second combustion chamber

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

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, but not all of them. Example. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

It should be noted that if there are directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention, the directional indications are only used to explain a certain posture (such as the accompanying drawings). When the relative positional relationship, movement situation, etc. between the various components shown below), if the specific posture changes, the directional indication also changes accordingly.

In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for the purpose of description, and should not be construed as instructions or Implicit their relative importance or implicitly indicate the number of technical features indicated. Thus, a feature delimited with "first", "second" may expressly or implicitly include at least one of that feature. In addition, the technical solutions between the various embodiments can be combined with each other, but must be based on the realization by those of ordinary skill in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of such technical solutions does not exist. , is not within the scope of protection required by the present utility model.

The utility model provides a burner, which is used for connecting gas and air to form a mixed gas for combustion to generate high-temperature flue gas. The burner can be used in electrical equipment such as water heaters that exchange heat with high-temperature flue gas. The high-temperature flue gas generated by the burner enters the interior of electrical equipment such as water heaters, and exchanges heat with the heat exchanger 11 of the electrical equipment. 1 to 5 are the accompanying drawings corresponding to the embodiments of the present invention.

1, 2 and 3, in one embodiment, the burner includes:

The burner body is formed with a first combustion chamber 70 and a second combustion chamber 80 which are communicated in sequence; at least two chambers are formed inside the burner body, wherein the first combustion chamber 70 and The second combustion chambers 80 communicate with each other, the first combustion chamber 70 is used for preheating combustion, and the high-temperature flue gas formed by the preheating combustion of the first combustion chamber 70 enters the second combustion chamber 80, so that all High temperature air combustion can be performed in the second combustion chamber 80 .

The pre-distribution device 20 is arranged on the main body of the burner, and is used to connect gas and air to form a mixed gas; the pre-distribution device 20 is used to mix the connected gas and air to form a mixed gas, which can be The mixed gas is supplied to the first combustion chamber 70 and the second combustion chamber 80 so as to supply the mixed gas in a preset ratio. The air-fuel ratio of the mixed gas output from the pre-distribution device 20 is the first air-fuel ratio.

The preheating combustion device 30 is arranged on the main body of the burner, and is used to connect the mixed gas input from the pre-distribution device 20 and input the mixed gas to the first combustion chamber 70 for preheating combustion to form high-temperature flue gas It is sent to the second combustion chamber 80 ; the preheating combustion device 30 is used for inputting mixed gas into the first combustion chamber 70 for combustion, so that high temperature flue gas is formed in the first combustion chamber 70 . The preheating combustion device 30 may adopt the existing burner structure. The preheating combustion device 30 has an air inlet, an air flow passage and an air outlet, the air inlet of the preheating combustion device 30 is connected to the distribution device, and the air-fuel ratio is the first air-fuel ratio from the air intake. The air outlet enters the airflow channel, and is input into the first combustion chamber 70 through the air outlet for preheating combustion to form high-temperature flue gas.

The gas injection assembly 50 is arranged on the main body of the burner, and is used to connect the mixed gas input from the pre-distribution device 20 and deliver it to the second combustion chamber 80 , so that the second combustion chamber 80 has a high temperature Air combustion reaction; the gas injection assembly 50 is used to connect to the pre-distribution device 20 and the air-fuel ratio of the mixture is the first air-fuel ratio.

A supplementary gas device 40 is provided on the main body of the burner and communicated with the gas injection assembly 50 for inputting fuel gas to the gas injection assembly 50 so as to make the preheating combustion device 30 and the gas injection assembly 50 The air-fuel ratio of 50 is not equal. The supplemental gas device 40 communicates with the outside of the burner, and is used for supplementing the gas injection assembly 50 with fuel gas, so that the air-fuel ratio of the gas output from the gas injection assembly 50 to the second combustion chamber 80 is the second air-fuel ratio. fuel ratio. Due to the supplement of the supplementary air device 40, the first air-fuel ratio and the second air-fuel ratio are not equal.

The gas supplement device 40 is used for supplementing gas to the gas injection assembly 50 . The air-fuel ratio of the mixed gas delivered from the pre-distribution device 20 to the preheating combustion device 30 and the gas injection assembly 50 is relatively fixed. The gas content in the mixed gas injected by the gas injection assembly 50 into the second combustion chamber 80 increases, so that the air-fuel ratio of the gas output from the preheating combustion device 30 and the gas injection assembly 50 is different.

The preheating combustion device 30 is injected and burned in the first combustion chamber 70, and the combustion products are excess air and high-temperature flue gas. Combustion products enter the second combustion chamber 80. When the second combustion chamber 80 reaches a preset temperature, the air supplement device 40 inputs the mixed gas into the second combustion chamber 80, and the air supplement device The fuel gas content in the mixed gas injected by 40 is relatively high, and the mixed gas is formed with the combustion products of the preheating combustion device 30 , and a high temperature and low oxygen environment is formed in the second combustion chamber 80 .

The high temperature air combustion reaction is carried out in the second combustion chamber 80 . During the high-temperature air combustion reaction, the chemical reaction needs to occur in a high-temperature and low-oxygen environment, the temperature of the reactant is higher than its auto-ignition temperature, and the maximum temperature rise during the combustion process is lower than its auto-ignition temperature, and the oxygen volume fraction is diluted by combustion products to very low concentrations. Since the high-temperature flue gas and excess oxygen in the combustion products of the preheating combustion device 30 enter the second combustion chamber 80 , the gas injection component 50 injects the gas in the mixed gas into the second combustion chamber 80 . The content is increased, so that the second combustion chamber 80 can form a high temperature and low oxygen environment required for the high temperature air combustion reaction. Compared with conventional combustion, in this combustion state, the pyrolysis of the fuel is suppressed and the flame thickness becomes thicker , the flame front disappears, so that the temperature in the entire second combustion chamber 80 is very uniform, the combustion peak temperature is low, the noise is extremely small, and the pollutant emissions of nitrogen oxides and carbon monoxide 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 burned evenly, and the temperature must be high. At the self-ignition point of the fuel, the self-ignition is maintained. The preset temperature of the mixed flue gas reaches the auto-ignition temperature of the gas injected by the gas injection assembly 50 , so that the gas injected by the gas injection assembly 50 can maintain auto-ignition in the second combustion chamber 80 .

Since the air content of the gas injected by the gas injection assembly 50 is reduced and the fuel gas content is increased, the oxygen concentration in the mixed smoke is relatively low, which is suitable for high temperature air combustion reaction in the second combustion chamber 80 . When the gas injected by the gas injection assembly 50 is combusted with high temperature air, the energy consumption required for the combustion is reduced. A fan may be arranged outside the burner to supply air into the pre-distribution device 20 , or other structures may be arranged outside the burner to supply air into the first combustion chamber 70 .

In this embodiment, the pre-distribution device 20 has a gas inlet 22 and an air inlet 23. The gas and air enter the pre-distribution device 20 for mixing, and are respectively delivered to the preheating combustion device 30 and the gas injection assembly 50. The gas supplement device 40 is used for connecting a gas pipeline, and is used for supplementing gas to the gas injection assembly 50 . A gas valve 60 for gas supply can be provided outside the burner body, and the gas supplement device 40 and the pre-distribution device 20 can be connected to the gas valve 60 at the same time. A first control valve 61 and a second control valve 62 are respectively provided on the gas valve 60 , the first control valve 61 is used to control the gas delivered to the pre-distribution device 20 , and the second control valve 62 is used for It is used to control the amount of gas delivered to the gas supplement device 40 .

The air in the first combustion chamber 70 is rapidly preheated by the preheating combustion device 30, so that the proportion of the heat load in the first combustion chamber 70 is adjusted within the range of 20%-50%, so that the first combustion chamber 70 forms a The emission of nitrogen oxides and carbon monoxide in the mixed flue gas is controlled at about 10ppm. Because high temperature air combustion is a volumetric combustion or dispersion combustion, it has low reaction rate, less local heat release, uniform heat flow distribution, low combustion peak temperature and minimal noise.

Since the preheating combustion device 30 generates less nitrogen oxides during the combustion process, the generated carbon monoxide can be fully combusted along with the combustion reaction of the high temperature air in the second combustion chamber 80 , so as to improve the combustion in the second combustion chamber 80 . The combustion efficiency of the gas is improved, and the heat release of the gas in the second combustion chamber 80 is increased. Compared with the traditional local high-temperature combustion in a small area, the high-temperature air combustion of the 16L gas-fired water heater equipped with the burner of this embodiment is carried out in a large area or even the entire second combustion chamber 80, and the flame front in the second combustion chamber 80 disappears; The generation of pollutants such as nitrogen oxides and carbon monoxide is significantly reduced; the overall temperature of the second combustion chamber 80 is increased, and the radiation heat transfer is enhanced. The combustion in the second combustion chamber 80 forms high-temperature flue gas, and the heat load of the combustion in the second combustion chamber 80 accounts for 50%-80%. By controlling the heat load ratio of the second combustion chamber 80 to be within the above range, the second combustion chamber 80 achieves soft combustion and achieves the purpose of low-noise combustion, thereby reducing the combustion noise of the gas water heater. The flue gas is rich in nitrogen and carbon dioxide, and the environmental pollution caused is relatively reduced.

Because the air-fuel ratios of the preheating combustion device 30 and the gas injection assembly 50 are different, the first combustion chamber 70 and the second combustion chamber 80 can achieve more complete combustion, thereby improving the combustion efficiency of the gas and increasing the combustion efficiency. Release heat, reduce the content of harmful gases in combustion products, and improve energy utilization.

In this embodiment, a temperature sensor 15 is provided in the second combustion chamber 80 for detecting the temperature in the second combustion chamber 80, and when the temperature in the second combustion chamber 80 reaches a preset temperature , controlling the gas injection assembly 50 to input mixed gas into the second combustion chamber 80 for high temperature air combustion, so that the second combustion chamber 80 can maintain a preheated high temperature air combustion state.

Referring to FIG. 3, in one embodiment, the pre-distribution device 20 includes: a pre-mixer 21, which is arranged on the main body of the burner and is used for connecting gas and air to form a mixed gas. The pre-heating combustion device 30 and the gas injection assembly 50 communicate with the premixer 21 respectively. The gas inlet 22 of the pre-distribution device 20 is used for connecting the gas valve 60 to connect gas, and the air inlet 23 of the pre-distribution device 20 is used to connect air. The premixer 21 may be provided with a fan, through which air is introduced, and the gas and air are mixed and delivered to the preheating combustion device 30 and the gas injection assembly 50 .

Further optionally, the pre-distribution device 20 further includes: a pre-distribution chamber 24, which is arranged on the burner main body and connected to the pre-mixer 21, the pre-heating combustion device 30 and the gas injection Components 50 are connected to the premixer 21 through the predistribution chambers 24, respectively. The pre-distribution chamber 24 is a hollow chamber disposed within the burner body. The premixer 21 is connected with gas and air and delivered to the pre-distribution chamber 24, where the gas and air are thoroughly mixed and delivered to the preheating combustion device 30 and the gas injection respectively The assembly 50 is used to realize the output of the mixed gas. By performing premixing, the mixing of the gas and the air is made more uniform, so that the combustion efficiency of the gas can be improved.

Referring to FIG. 4 and FIG. 5 , in one embodiment, the gas injection assembly 50 includes: a casing 51 , which is disposed on the main body of the burner, and a gas distribution chamber 52 is formed in the casing 51 . The gas device 40 is connected with the gas distribution chamber 52, and the housing 51 is communicated with the pre-distribution device 20; and the nozzle 53 is set in the housing 51 and communicated with the gas distribution chamber 52, so The nozzle 53 is used to inject gas into the second combustion chamber 80 . The housing 51 has an air inlet and an air outlet, the air inlet and the air outlet are respectively connected to the gas distribution chamber 52 , and the air inlet of the housing 51 can be directly connected to the pre-distribution device 20 . In the pre-distribution chamber 24 , the air outlet of the casing 51 communicates with the interior of the combustion chamber main body, and is used to deliver the mixed gas to the second combustion chamber 80 . The gas supplement device 40 is used for supplementing gas to the gas distribution chamber 52 .

The gas distribution chamber 52 is used for buffering and mixing the mixed gas, so that the mixed gas can be sufficiently mixed uniformly in the gas distribution chamber 52 . When manufacturing the gas injection assembly 50 , a nozzle 53 may be provided on the housing 51 , and the nozzle 53 may be connected to the gas distribution chamber 52 to realize gas output. The number of the nozzles 53 may be multiple, and a plurality of the nozzles 53 are arranged at intervals along the housing 51 to disperse and input the mixed gas.

The supplemental gas volume of the gas supplementation device 40 can be adjusted by adjusting the second control valve 62 . When manufacturing the casing 51 , a pressure gauge may be provided on the air supplement device 40 to detect the air pressure of the air supplement device 40 .

In order to facilitate installation, in one embodiment, the gas injection assembly 50 further includes: a connecting assembly, which communicates the pre-distribution device 20 with the gas distribution chamber 52 . One end of the connecting assembly can be connected with the pre-distribution chamber 24 of the pre-distribution device 20 , and the other end can be communicated with the gas distribution chamber 52 to realize gas input. The air supplement device 40 can be connected to the gas distribution chamber 52 or directly connected to the connection component, and the connection position of the air supplement device 40 can be determined according to the structural distribution of the burner. By arranging the connection assembly, the connection mode of the gas injection assembly 50 can be easily changed according to the structure and spatial distribution of the burner main body. The connection component may be a pipeline connecting the pre-distribution device 20 and the housing 51, or may be in other structural forms.

Further optionally, the connecting assembly includes: a first connecting section 54, in which a first air passage 55 communicating with the pre-distribution device 20 is formed; and a second connecting section 56, the The first connection section 54 communicates with the housing 51 through the second connection section 56 , a second air flow channel 57 is formed in the second connection section 56 , and the first air flow channel 55 passes through the second air flow The channel 57 communicates with the gas distribution chamber 52, and the second connection section 56 is arranged at a distance from the burner main body. The first connection section 54 and the second connection section 56 are used to connect the pre-distribution device 20 and the housing 51 to form an air flow passage between the pre-distribution device 20 and the housing 51 .

The first connecting section 54 is connected to the pre-dispensing device 20, and the second connecting section 56 is located between the housing 51 and the first connecting section 54, because the second connecting section 56 is connected to the The distance between the burner bodies can be set so as to avoid the influence of the internal high temperature during the operation of the burner on the second connecting section 56 . During the flow of the mixed gas from the pre-distribution device 20 to the casing 51 , the heat generated by the combustion of the burner body has less influence on the gas in the second connecting section 56 , and thus can avoid being transported to the The temperature of the mixed gas in the gas distribution chamber 52 is too high, which leads to the problem that the gas injection assembly 50 is easily tempered.

When manufacturing the gas injection assembly 50, optionally, the gas distribution chamber 52 has a first end close to the nozzle 53 and a second end away from the nozzle 53, and the second gas flow channel 57 is far away from all the nozzles 53. One end of the first airflow channel 55 is communicated with the second end of the gas distribution chamber 52, and when the gas enters the housing 51 from the second connecting section 56, it can be far away from the outlet of the gas distribution chamber 52. One end of the gas port can prevent the second connecting section 56 from being close to the heat source, which helps to reduce the initial temperature of the gas entering the gas distribution chamber 52, thereby avoiding tempering.

The second connecting section 56 has a first side wall and a second side wall, and the second air flow channel 57 is formed between the first side wall and the second side wall, and the first side wall is formed. Proximate to the burner body, the second side wall is disposed away from the burner body. The first side wall and the main body of the burner are arranged at a distance. When the second connecting section 56 is made, a heat dissipation device can be provided on the side of the second side wall facing away from the second airflow channel 57 . For example, heat dissipation fins are used to cool the second connecting section 56 to reduce the initial temperature of the mixed gas injected by the gas injection assembly 50 .

Since the second connection section 56 is spaced from the burner main body, the gap formed between the second connection section 56 and the burner main body can be used as a cooling channel for cooling the second connection section 56 to lower the temperature, and can also be used to lower the temperature of the outer wall surface of the burner main body, so as to improve the safety of the burner.

When arranging the gas injection assembly 50 , the gas outlet of the casing 51 can be arranged close to the first combustion chamber 70 , and the mixed gas injected by the gas injection assembly 50 into the burner body can quickly interact with all combustion chambers. The high-temperature flue gas and excess air generated by the combustion of the preheating combustion device 30 are rapidly mixed.

The utility model also proposes an embodiment of a water heater.

The water heater includes: a body 10; the burner according to any of the above embodiments, which is provided in the body 10; The chambers 80 are in communication. The heat exchanger 11 is provided with a heat exchange tube 12 , and the high temperature flue gas generated by the combustion reaction of the high temperature air of the burner enters the heat exchanger 11 and conducts heat with the heat exchange tube 12 inside the heat exchanger 11 . Exchange to form hot water, and the low-temperature flue gas after heat exchange is discharged.

The water heater may also include other functional components, such as a fume collecting hood 13 and a smoke exhaust pipe 14 connected to the fume collecting hood 13 , and the low-temperature flue gas produced by the heat exchange of the heat exchanger 11 enters the fume collecting hood 13 . , and is discharged through the smoke exhaust pipe 14 .

Because the air-fuel ratio of the mixed gas of the preheating combustion device 30 and the gas injection assembly 50 is different, the combustion reaction of the high-temperature air in the second combustion chamber 80 is more fully controllable, and the nitrogen in the generated high-temperature flue gas is more fully controllable. The content of oxides and carbon monoxide is reduced, and the low-temperature flue gas discharged through the flue gas exhaust pipe 14 is less likely to generate air pollution.

The water heater may further include a controller, and the operation state of the burner may be controlled by the controller of the water heater. Further optionally, the water heater further includes: a temperature sensor 15, used for the temperature in the second combustion chamber 80; and a controller, which is electrically connected to the body 10 and the temperature sensor 15, and used to obtain all the temperature in the second combustion chamber 80 and the heat load required by the water heater; and when the temperature in the second combustion chamber 80 reaches a preset temperature, controlling the gas injection assembly 50 to the first Fuel gas is injected into the second combustion chamber 80 to make the second combustion chamber 80 burn with high temperature air, so as to achieve the required heat load range of the water heater.

High temperature air combustion is controlled in the second combustion chamber 80 by the controller, and the gas injection assembly 50 is used to inject a mixed gas with a higher gas content into the second combustion chamber 80, so that the second combustion chamber 80 is burned A state of high temperature and low oxygen is formed in the chamber 80, thereby having better combustion efficiency, which is helpful to improve the energy efficiency of the water heater and save gas resources.

Claims (11)

1. A burner, characterized in that, comprising: a burner main body, the burner main body is formed with a first combustion chamber and a second combustion chamber which are communicated in sequence; a pre-distribution device, arranged on the burner body, for connecting gas and air to form a mixed gas; A preheating combustion device is arranged on the main body of the burner, and is used to connect the mixed gas input by the pre-distribution device and input the mixed gas to the first combustion chamber for preheating combustion, so as to form high-temperature flue gas and transport it to the first combustion chamber. the second combustion chamber; a gas injection assembly, arranged on the main body of the burner, for accessing the mixed gas input from the pre-distribution device and delivering it to the second combustion chamber, so that the combustion reaction of high temperature air is carried out in the second combustion chamber; and a gas supplement device, which is arranged on the main body of the burner and communicates with the gas injection assembly, and is used for inputting fuel gas to the gas injection assembly, so that the mixed gas output by the preheating combustion device can be mixed with the gas injection assembly The air-fuel ratio of the output mixture is not equal. 2. The burner of claim 1, wherein the predistribution means comprises: The premixer is arranged on the main body of the burner and is used for connecting gas and air to form a mixed gas. The preheating combustion device and the gas injection assembly are respectively communicated with the premixer. 3. The burner of claim 2, wherein the predistribution device further comprises: A pre-distribution chamber is provided on the main body of the burner and connected to the pre-mixer, and the preheating combustion device and the gas injection assembly are respectively connected to the pre-mixer through the pre-distribution chamber. 4. The burner of claim 1, wherein the gas injection assembly comprises: a casing, disposed on the main body of the burner, a gas distribution chamber is formed in the casing, the air supplement device is connected with the gas distribution chamber, and the casing is communicated with the pre-distribution device; and A nozzle is provided in the casing and communicates with the gas distribution chamber, and the nozzle is used for injecting gas into the second combustion chamber. 5 . The burner according to claim 4 , wherein the number of the nozzles is plural, and the plural nozzles are arranged on the casing at intervals. 6 . 6. The burner of claim 4, wherein the gas injection assembly further comprises: A connecting assembly is provided on the burner main body and used to communicate the pre-distribution device and the gas distribution chamber. 7. The burner of claim 6, wherein the connection assembly comprises: a first connecting section, which is arranged on the burner main body, and a first airflow channel that communicates with the pre-distribution device is formed in the first connecting section; and A second connection section, the first connection section communicates with the housing through the second connection section, a second air flow channel is formed in the second connection section, and the first air flow channel passes through the second connection section The airflow channel is communicated with the gas distribution chamber, and the second connection section is arranged at a distance from the burner main body. 8. The burner of claim 7, wherein the gas distribution chamber has a first end close to the nozzle and a second end remote from the nozzle, and the second gas flow passage is remote from the first end. One end of a gas flow channel communicates with the second end of the gas distribution chamber. 9. The burner of any one of claims 1 to 7, wherein the burner further comprises: The gas valve is arranged on the main body of the burner, the pre-distribution device has an air inlet and a gas inlet, and the gas inlet of the pre-distribution device and the gas supplement device are respectively connected to the gas valve. 10. A water heater, comprising: body; The burner according to any one of claims 1 to 9, provided in the body; and The heat exchanger is arranged on the body and communicated with the second combustion chamber of the burner. 11. The water heater of claim 10, wherein the water heater further comprises: a temperature sensor for the temperature within the second combustion chamber; and a controller, electrically connected to the body and the temperature sensor, for acquiring the temperature in the second combustion chamber and the heat load required by the water heater; and for acquiring the temperature in the second combustion chamber when the temperature in the second combustion chamber reaches a preset When the temperature is set, the gas injection assembly is controlled to inject gas into the second combustion chamber, so that the second combustion chamber is burned with high-temperature air, so as to achieve the required heat load range of the water heater.

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