CN216619816U - 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; preheating the combustion device; the gas injection assembly and the gas supplementing device are arranged on the burner main body, communicated with the preheating combustion device and used for inputting air to the preheating combustion device, so that the air-fuel ratio of mixed gas output by the preheating combustion device is not equal to that of mixed gas output by the gas injection assembly. According to the utility model, the air-fuel ratio of the mixed gas injected by the gas injection assembly is different from that of the preheating combustion device, the preheating combustion device is used for combustion to form high-temperature flue gas and excess air to preheat in the second combustion chamber, and the high-temperature air is used for combustion in the second combustion chamber, so that the energy utilization rate of the fuel gas is improved.

Description

Combustor and water heater

Technical Field

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

Background

The gas water heater mainly comprises a valve body assembly, a burner, a heat exchanger, a safety device and the like, and comprises a flue type water heater flue, a forced-ventilated type water heater and the like. The valve body assembly controls the working procedure of the whole water heater and comprises a water valve, an air valve, a microswitch, an igniter and the like. When the water heater is installed, valves are installed on the water inlet pipe, the water outlet pipe and the gas pipe so as to control the gas quantity and the water quantity. In the existing water heater, a fixed gas valve is usually adopted to operate in a fixed opening state, the gas supply quantity is constant, the air-fuel ratio of the water heater is constant, and in order to achieve a preset heat load, the gas supply quantity needs to be kept large, so that partial gas is not sufficiently combusted, and the utilization rate of the gas is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims to provide a burner and a water heater, and aims to solve the problem of low utilization rate of gas in partial existing water heaters.

In order to achieve the above object, the present invention provides a burner comprising:

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 so as to form high-temperature flue gas and conveying the high-temperature flue gas to the second combustion chamber;

the gas injection assembly is arranged in the burner main body and used for accessing the mixed gas input by the pre-distribution device and conveying the mixed gas to the second combustion chamber so as to enable the second combustion chamber to carry out high-temperature air combustion reaction; and

and the air supplementing device is arranged on the burner main body, is communicated with the preheating combustion device and is used for inputting air to the preheating combustion device 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.

Optionally, the preheating combustion device comprises:

the preheating burner is arranged on the burner main body and used for delivering gas to the first combustion chamber for combustion; and

the gas distribution mechanism is arranged on the burner main body, the preheating burner is connected with the pre-distribution device through the gas distribution mechanism, and the air supply device is connected with the gas distribution mechanism so as to input air to the preheating burner through the gas distribution mechanism.

Optionally, a gas mixing cavity is formed in the gas distribution mechanism, a porous plate is arranged in the gas mixing cavity, and the gas supplied to the gas distribution mechanism by the gas supply device and the pre-distribution device enters the preheating combustion device through the porous plate.

Optionally, the number of the porous plates is multiple, the multiple porous plates are arranged at intervals, and the holes of the adjacent porous plates are arranged in a staggered manner.

Optionally, the air supplement device has a gas input end for accessing air and a gas output end for communicating the gas mixing chamber, and the output end of the air supplement device is arranged on one side of the porous plate close to the pre-distribution device.

Optionally, the gas injection assembly comprises:

the shell is arranged in the burner main body, a gas distribution chamber is formed in the shell, and the shell is connected with the pre-distribution device through a gas distribution pipe; and

and the nozzle is arranged on the shell and communicated with the gas distribution chamber, and is used for conveying gas to the second combustion chamber.

Optionally, the number of the nozzles is multiple, the nozzles are arranged at intervals, and the inner diameter of the nozzle close to the gas distribution pipe is smaller than the inner diameter of the nozzle far away from the gas distribution pipe.

Optionally, the pre-distribution device comprises:

the pre-mixer is arranged on the burner main body and used for connecting gas and air to form mixed gas, and the preheating combustion device and the gas injection assembly are respectively connected with the pre-mixer.

Optionally, the pre-distributing device further comprises:

the pre-distribution chamber is arranged on the burner main body and connected with the premixer, and the preheating combustion device and the gas injection assembly are respectively connected with the premixer through the pre-distribution chamber.

The utility model also proposes a water heater comprising:

a body;

the combustor is arranged on the machine body; and

and the heat exchanger is arranged on the machine body and communicated with the second combustion chamber of the combustor.

Optionally, the water heater further comprises:

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

the controller is electrically connected with the machine body and the temperature sensor and is used for acquiring the temperature in the second combustion chamber and the heat load required by the water heater; and the gas injection assembly is also used for controlling the gas injection assembly to inject gas into the second combustion chamber when the temperature in the second combustion chamber reaches a preset temperature, so that the second combustion chamber is subjected to high-temperature air combustion, and the range of the heat load required by the water heater is reached.

According to the technical scheme, the pre-distribution device is adopted to convey the mixed gas of the fuel gas and the air to the preheating combustion device and the gas injection assembly, the air supplementing device is utilized to supplement the air to the preheating combustion device, the air-fuel ratio of the mixed gas injected by the gas injection assembly is different from that of the preheating combustion device, the preheating combustion device is utilized to combust to form high-temperature flue gas and excess air, the high-temperature flue gas and the excess air are preheated in the second combustion chamber, and high-temperature air combustion is carried out in the second combustion chamber, so that the fuel gas combustion of the combustor is more sufficient, and the energy utilization rate of the fuel gas is improved.

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 of the present invention;

FIG. 2 is a left side view of FIG. 1;

fig. 3 is a sectional view taken along the line a-a in fig. 1.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				10	Machine body	11	Heat exchanger
12	Heat exchange tube	13	Exhaust fume collecting hood
				14	Smoke exhaust pipe	15	Temperature sensor
20	Pre-distribution device	21	Premixing device
				22	Gas inlet	23	Air inlet
24	Pre-distribution chamber	30	Preheating combustion device
				31	Preheating burner	32	Gas distribution mechanism
33	Gas mixing cavity	34	Perforated plate
				40	Air supplement device	41	Fan blower
50	Gas injection assembly	51	Shell body
				52	Gas distribution chamber	53	Gas distribution pipe
54	Control valve	55	Nozzle with a nozzle body
				60	First combustion chamber	70	Second combustion chamber

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

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be 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.

It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The utility model provides a burner which is used for introducing fuel gas and air to form mixed gas and spraying the mixed gas in a preset space to burn to form high-temperature flue gas. The combustor can be used for water heaters, wall-mounted furnaces and other electrical equipment which form the water heater by exchanging heat with high-temperature flue gas. Fig. 1 to fig. 3 are corresponding drawings of an embodiment of the present invention.

Referring to fig. 1, 2 and 3, in one embodiment, the burner includes:

a burner body formed with a first combustion chamber 60 and a second combustion chamber 70 communicated in sequence; the first combustion chamber 60 and the second combustion chamber 70 are two chambers within the burner body. The first combustion chamber 60 is used for preheating combustion, and the second combustion chamber 70 is used for high-temperature air combustion. The first combustion chamber 60 is in communication with the second combustion chamber 70 such that the preheated combustion products within the first combustion chamber 60 may enter the second combustion chamber 70. The first combustion chamber 60 and the second combustion chamber 70 may be two independent chambers, which are communicated with each other. Or may be two portions of the same chamber.

The pre-distribution device 20 is arranged on the burner main body and is used for introducing gas and air to form mixed gas; the pre-distribution device 20 has a gas inlet 22 and an air inlet 23 for receiving gas and air, respectively, which form a mixed gas in the pre-distribution device 20. The predistribution device 20 may be provided with a fan 41 for introducing air. The predistribution device 20 can be connected to a gas valve for the supply of gas. The air-fuel ratio of the mixed flue gas formed by the pre-distribution device 20 is a first air-fuel ratio.

The preheating combustion device 30 is arranged in the burner body and is used for receiving the mixed gas input by the pre-distribution device 20 and inputting the mixed gas into the first combustion chamber 60 for preheating combustion so as to form high-temperature flue gas and conveying the high-temperature flue gas to the second combustion chamber 70; the mixed gas portion formed by the pre-distribution device 20 is delivered to the preheating combustion device 30, the preheating combustion device 30 delivers the mixed gas into the first combustion chamber 60, an existing ignition device may be disposed in the first combustion chamber 60 to ignite the mixed gas, the combustion product formed by the combustion of the mixed gas includes high-temperature flue gas and excess air, and the combustion product enters the second combustion chamber 70.

The gas injection assembly 50 is arranged in the burner main body and is used for receiving the mixed gas input by the pre-distribution device 20 and conveying the mixed gas to the second combustion chamber 70 so as to enable the second combustion chamber 70 to perform a high-temperature air combustion reaction; the mixed gas part formed by the pre-distribution device 20 is conveyed to the gas injection assembly 50, and the air-fuel ratio of the mixed gas entering the gas injection assembly 50 is a first air-fuel ratio. Combustion products of the preheating combustion device 30 enter the second combustion chamber 70, and when the temperature in the second combustion chamber 70 reaches a preset temperature, the gas injection assembly 50 injects mixed gas into the second combustion chamber 70, so that a high-temperature air combustion reaction is performed in the second combustion chamber 70.

The air supplement device 40 is arranged on the burner body, is communicated with the preheating combustion device 30, and is used for inputting air to the preheating combustion device 30, so that the air-fuel ratio of the mixed gas output by the preheating combustion device 30 is not equal to that of the mixed gas output by the gas injection assembly 50. The air supply device 40 is connected with the preheating combustion device 30 so as to make air supplement to the preheating combustion device 30, and due to the increase of the air, the air-fuel ratio of the mixed gas output by the preheating combustion device 30 is a second air-fuel ratio, and the first air-fuel ratio is not equal to the second air-fuel ratio. The air supply device 40 may be a blower 41, and air outside the burner body is drawn into the preheating combustion device 30 through the blower 41 to be mixed with the mixed gas delivered to the preheating combustion device 30 by the pre-distribution device 20.

Because the air supplementing device 40 supplements air to the preheating combustion device 30, the air content in the preheating combustion device 30 is increased, and in the preheating combustion process of the mixed gas sprayed by the preheating combustion device 30, the fuel gas in the mixed gas can be fully combusted, the content of nitrogen oxide and carbon monoxide in the combustion products is reduced, and further the content of harmful gas is reduced. Excess air in the combustion products is heated and may enter the second combustion chamber 70 with hot flue gas to enable the second combustion chamber 70 to reach a preset temperature of hot air combustion. Because the gas content among the mist that the gas injection subassembly 50 jetted will be to higher, when the gas injection subassembly 50 to when second combustion chamber 70 jetted gas, can form high temperature low oxygen environment in the second combustion chamber 70, conveniently carry out high temperature air combustion reaction. In this embodiment, a gas valve may be provided outside the burner body for delivering gas to the predistribution device 20.

The air supplement device 40 can draw air outside the burner body into the preheating combustion device, the preheating combustion device is provided with an air inlet and an air outlet, and the air supplement device is communicated with the preheating combustion device at the air inlet of the device. And the air supplemented by the air supplementing device and the mixed gas output by the pre-distribution device respectively enter the preheating combustion device for mixing, and are output to the first combustion chamber from an air outlet port of the preheating combustion device. When the combustor is manufactured, a porous plate is arranged at an air inlet port of the preheating combustion device, air supplemented by the air supplementing device and mixed gas input by the pre-distribution device are conveyed to the preheating combustion device through the porous plate, so that the porous plate blocks the flow of the air flow, and when the air flow flows through the porous plate, the direction of the air flow can be changed, so that the air supplemented by the air supplementing device and the mixed gas output by the pre-distribution device are premixed, and the air is conveyed to the preheating combustion device, so that the uniformity of the gas is higher, and the combustion efficiency of the preheating combustion device is promoted.

The high-temperature air combustion reaction is performed in the second combustion chamber 70. During the combustion reaction of the high-temperature air, the chemical reaction needs to occur in a high-temperature low-oxygen environment, the temperature of 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 to an extremely low concentration by combustion products. Because the excess oxygen in the combustion products of the preheating combustion device 30 is preheated in the preheating combustion process, the formed high-temperature flue gas and the excess oxygen in the high-temperature state enter the second combustion chamber 70, the second combustion chamber 70 can form the high-temperature low-oxygen environment required by the high-temperature air combustion reaction, compared with the conventional combustion, in the combustion state, the pyrolysis of the fuel is inhibited, the flame thickness is thickened, and the flame front surface disappears, so that the temperature of the whole second combustion chamber 70 is very uniform, the combustion peak temperature is low, the noise is extremely low, and the emission of pollutants of nitrogen oxides and carbon monoxide 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. The preset temperature of the mixed flue gas reaches the autoignition temperature of the fuel gas injected by the gas injection assembly 50, so that the fuel gas injected by the gas injection assembly 50 can maintain autoignition in the second combustion chamber 70.

Since the first combustion chamber and the second combustion chamber are communicated with each other, when the preheating combustion device and the gas injection assembly are arranged, the gas output by the gas injection assembly enters the second combustion chamber. Can with gas injection assembly's gas outlet intercommunication first combustion chamber is close to the one end of second combustion chamber, works as preheat burner injection gas when burning, because the air content among the burner is high in preheating, preheat the gas combustion that burner injection is abundant, works as preheat burner's combustion product with during the mist of gas injection assembly's gas outlet output, can mix with mist fast to heat mist, so that the mist of gas injection assembly output warms up fast, when gaseous entering in the second combustion chamber, can reach spontaneous combustion temperature, realize fast combustion, make high temperature air combustion reaction in the second combustion chamber is more abundant.

The preheating combustion device 30 is used for rapidly preheating the air in the first combustion chamber 60, so that the heat load ratio in the first combustion chamber 60 is adjusted to be within the range of 20-50%, and the emission of nitrogen oxides and carbon monoxide in the mixed flue gas formed by the first combustion chamber 60 is controlled to be about 10 ppm. Because the air that air supplement unit 40 supplyed can promote preheat the efficiency of burning in the first combustion chamber 60 for preheat the gas of burning more abundant, because high temperature air burning is a volume burning or dispersion burning, its reaction rate is low, local heat release is few, the heat flow distribution is even, the peak temperature of burning is low and the noise is minimum.

Since the combustion of the preheating combustion device 30 generates less nitrogen oxides during the combustion process, the generated carbon monoxide can be sufficiently combusted along with the combustion reaction of the high-temperature air in the second combustion chamber 70, so as to improve the combustion efficiency of the gas in the second combustion chamber 70 and increase the heat release of the gas in the second combustion chamber 70. Compared with the traditional local high-temperature combustion in a small area, the high-temperature air combustion of the 16L gas water heater with the combustor provided by the embodiment has the advantages that the reaction is carried out in a large area, even the whole second combustion chamber 70, and the flame front surface in the second combustion chamber 70 disappears; the generation of pollutants such as nitrogen oxides, carbon monoxide and the like is obviously reduced; the overall temperature of the second combustion chamber 70 is increased and the radiant heat transfer is enhanced. The second combustion chamber 70 is internally combusted to form high-temperature flue gas, and the combustion heat load of the second combustion chamber 70 accounts for 50% -80%. The heat load ratio of the second combustion chamber 70 is controlled in the range, so that the soft combustion is achieved in the second combustion chamber 70, the purpose of low-noise combustion is achieved, the combustion noise of the gas water heater can be reduced, and the environmental pollution caused by the fact that high-temperature smoke generated by high-temperature air combustion is rich in nitrogen and carbon dioxide is relatively reduced.

Due to the fact that the air-fuel ratios of the preheating combustion device 30 and the gas injection assembly 50 are different, more sufficient combustion can be achieved in the first combustion chamber 60 and the second combustion chamber 70, the combustion efficiency of gas can be improved, combustion heat release can be increased, harmful gas content in combustion products can be reduced, and the energy utilization rate can be improved.

In this embodiment, a temperature sensor 15 is disposed in the second combustion chamber 70, and is used for detecting the temperature in the second combustion chamber 70, and when the temperature in the second combustion chamber 70 reaches a preset temperature, the gas injection assembly 50 is controlled to input the mixed gas into the second combustion chamber 70 for high-temperature air combustion, so that the second combustion chamber 70 can maintain a preheated high-temperature air combustion state.

In one embodiment, the pre-dispensing device 20 comprises: the pre-mixer 21 is arranged in the burner body and used for introducing gas and air to form mixed gas, and the preheating combustion device 30 and the gas injection assembly 50 are respectively communicated with the pre-mixer 21. The gas inlet 22 of the pre-distribution device 20 is used for connecting a gas valve to receive gas, and the air inlet 23 of the pre-distribution device 20 is used for receiving air. The premixer 21 may be provided with a blower 41, and air is introduced through the blower 41 while gas and air are mixed and delivered to the preheating burner 30 and the gas injection assembly 50.

Further optionally, the pre-distribution device 20 further includes: and a pre-distribution chamber 24 disposed in the burner body and connected to the premixer 21, wherein the preheating combustion device 30 and the gas injection assembly 50 are connected to the premixer 21 through the pre-distribution chamber 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 is conveyed to the pre-distribution chamber 24, the gas and the air are fully mixed in the pre-distribution chamber 24 and are respectively conveyed to the preheating combustion device 30 and the gas injection assembly 50, so that the output of mixed gas is realized, and the gas and the air are mixed more uniformly by premixing, so that the combustion efficiency of the gas can be improved.

The gas injection assembly 50 is in communication with the pre-distribution chamber 24, and a control valve 54 may be disposed between the gas distribution chamber 52 and the pre-distribution chamber 24 to facilitate control of the opening or closing of the gas injection assembly 50.

Referring to fig. 3, in an embodiment, the preheating combustion device 30 includes: a preheating burner 31 provided in the burner main body and configured to supply gas to the first combustion chamber 60 for combustion; the preheating burner 31 is used for introducing gas and injecting the gas into the first combustion chamber 60, and the gas injected by the preheating burner 31 is ignited in the first combustion chamber 60 to form a combustion product of high-temperature flue gas and excess air.

The gas distribution mechanism 32 is arranged on the burner main body, the preheating burner 31 is connected with the pre-distribution device 20 through the gas distribution mechanism 32, and the air supply device 40 is connected with the gas distribution mechanism 32 so as to input air to the preheating burner 31 through the gas distribution mechanism 32. The gas distribution mechanism 32 is used for connecting the preheating burner 31 and the pre-distribution device 20, and the mixed gas output by the pre-distribution device 20 firstly enters the gas distribution mechanism 32, is mixed with the air supplemented by the air supplement device 40 in the gas distribution mechanism 32, and then is delivered to the preheating burner 31.

The gas distribution mechanism 32 forms a space for mixing the air supplemented by the air supplementing device 40 and the mixed gas input by the pre-distribution device 20, and the gas distribution mechanism 32 may have a pipeline structure or a hollow cavity structure. The gas distribution mechanism 32 is disposed between the preheating burner 31 and the pre-distribution device 20, and can be used to extend the gas flow path between the pre-distribution device 20 and the preheating burner 31, so that the air supplemented by the air supplement device 40 can be more sufficiently mixed with the mixed gas output by the pre-distribution device 20, so as to make the gas input into the preheating burner 31 more uniform. When the pre-distribution device 20 comprises a pre-mixer 21 and the pre-distribution chamber 24, the gas distribution mechanism 32 is disposed between the pre-distribution chamber 24 and the preheating burner 31.

Optionally, a gas mixing chamber 33 is formed in the gas distribution mechanism 32, a porous plate 34 is arranged in the gas mixing chamber 33, and the gas input to the gas distribution mechanism 32 by the gas supply device 40 and the pre-distribution device 20 enters the preheating combustion device 30 through the porous plate 34. Be provided with a plurality of through-holes on the perforated plate 34, gas mixing chamber 33 is for forming in the cavity in the gas distribution mechanism 32, perforated plate 34 will gas mixing chamber 33 separates and forms two at least cavities, perforated plate 34 blocks pre-distribution device 20 with on the gas flow path between preheating burner 31, make the gas flow must pass through hole on perforated plate 34 gets into in the preheating burner 31.

The perforated plate 34 can play the effect of ending to the air current, makes pre-distribution device 20 with the gas of air supplement unit 40 input is blockked, and the air current is in under the effect of ending of perforated plate 34, can mix gradually, when the air current flows through the through-hole of perforated plate 34, the air current can further mix, and then has better homogeneity, makes the gas combustion homogeneity of preheating combustor 31 output is higher, and the excess air in the combustion products also can be fully preheated moreover.

Further optionally, the quantity of perforated plate 34 is a plurality of, and is a plurality of perforated plate 34 interval sets up, and is adjacent the hole dislocation set each other of perforated plate 34 to make a plurality of perforated plate 34 can play the effect of blockking to the air current, and the gas and the air intensive mixing in the air current, and then promote the homogeneity of air current.

Optionally, air supplement unit 40 has the gas input end that is used for inserting the air and is used for the intercommunication the gas mixing chamber 33's gas output end, air supplement unit 40's output is located the perforated plate 34 is close to one side of pre-distribution device 20, so that air supplement unit 40 mends air in the gas mixing chamber 33 can with pre-distribution device 20 carries extremely gas in the gas mixing chamber 33 carries out intensive mixing, the extension the air current route of the gas that air supplement unit 40 mended, and then the promotion is carried extremely the homogeneity of the air current of preheating combustor 31. When the perforated plate 34 is provided in plurality, air and gas can gradually and dispersedly flow to the preheating burner 31 through the blocking of the perforated plate 34 in plurality, so that the preheating combustion efficiency of the preheating burner 31 is higher, and the content of harmful gas generated by the preheating burner can be greatly reduced.

Taking the arrangement shown in fig. 3 as an example, the pre-distribution device 20 is located below the gas mixing chamber 33, and the pre-distribution device 20 outputs the mixed gas from bottom to top. The gas output end of the gas supplementing device 40 is arranged close to the lower end of the gas mixing cavity 33, so that the air supplemented by the gas supplementing device 40 can flow from bottom to top and is mixed with the gas input by the pre-distribution device 20.

Referring to fig. 3, in one embodiment, the gas injection assembly 50 includes: a housing 51 disposed on the burner body, wherein a gas distribution chamber 52 is formed in the housing 51, and the housing 51 is connected to the predistribution device 20 through a gas distribution pipe 53; and a nozzle 55 provided in the housing 51 and communicating with the gas distribution chamber 52, the nozzle 55 being configured to supply gas to the second combustion chamber 70. When a control valve 54 is provided, the control valve 54 may be provided on the gas distribution pipe 53 to control the gas flow rate of the gas distribution chamber 52. The control valve 54 may be a check valve to prevent reverse flow of the air flow.

The shell 51 is provided with a gas inlet and a gas outlet, the gas inlet and the gas outlet are respectively communicated with the gas distribution chamber 52, the gas inlet of the shell 51 can be directly communicated with the pre-distribution chamber 24 of the pre-distribution device 20, and the gas outlet of the shell 51 is communicated with the interior of the combustion chamber main body and is used for conveying mixed gas to the second combustion chamber 70. The gas supply device 40 is used for supplying 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 and uniformly mixed in the gas distribution chamber 52. When the gas injection assembly 50 is manufactured, a nozzle 55 may be disposed on the housing 51, and the nozzle 55 is communicated with the gas distribution chamber 52 to realize gas output. The number of the nozzles 55 may be plural, and a plurality of the nozzles 55 are spaced along the housing 51 to disperse the input mixed gas.

Since the gas flow path of the nozzles 55 close to the gas distribution pipe 53 is relatively short and the gas flow is relatively large, while the gas flow path of the nozzles 55 far from the gas distribution pipe 53 is relatively long and the gas flow is relatively small, in this embodiment, further optionally, the inner diameter of the nozzles 55 close to the gas distribution pipe 53 is smaller than the inner diameter of the nozzles 55 far from the gas distribution pipe 53.

Taking the state shown in fig. 1 as an example, the nozzles 55 are distributed at intervals along the length direction of the housing 51, and one end of the gas distribution pipe 53 away from the predistribution device 20 is connected to one end of the length direction of the housing 51, wherein the inner diameter of the nozzles 55 is gradually increased from the right to the left so as to equalize the gas flow output by the plurality of nozzles 55. When the output end of the gas distribution pipe 53 is connected to the middle of the housing 51, the inner diameter of the nozzle 55 is gradually increased from the middle to both ends.

The utility model also provides an embodiment of the water heater.

The water heater includes: a body 10; the burner according to any one of the above embodiments, provided in the machine body 10; and a heat exchanger 11 provided in the body 10 and communicating with the second combustion chamber 70 of the burner. The heat exchanger 11 is provided with a heat exchange tube 12, high-temperature flue gas generated by combustion reaction of high-temperature air of the burner enters the heat exchanger 11 to exchange heat with the heat exchange tube 12 inside the heat exchanger 11 to form hot water, and low-temperature flue gas after heat exchange is discharged.

The water heater can also comprise other functional components, such as a smoke collecting hood 13 and a smoke exhaust pipe 14 communicated with the smoke collecting hood 13, wherein low-temperature smoke generated by heat exchange through the heat exchanger 11 enters the smoke collecting hood 13 and is exhausted through the smoke exhaust pipe 14.

Due to the fact that the air-fuel ratios of the mixed gas of the preheating combustion device 30 and the gas injection assembly 50 are different, the combustion reaction of the high-temperature air in the second combustion chamber 70 is more fully controllable, the content of nitrogen oxides and carbon monoxide in the generated high-temperature flue gas is reduced, and the low-temperature flue gas exhausted through the smoke exhaust pipe 14 is not prone to 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 comprises: a temperature sensor 15 for the temperature inside the second combustion chamber 70; and a controller electrically connected to the body 10 and the temperature sensor 15 for acquiring the temperature in the second combustion chamber 70 and the heat load required by the water heater; and is further used for controlling the gas injection assembly 50 to inject gas into the second combustion chamber 70 when the temperature in the second combustion chamber 70 reaches a preset temperature, so that the second combustion chamber 70 is subjected to high-temperature air combustion, and the required heat load range of the water heater is reached.

The controller controls the second combustion chamber 70 to burn high-temperature air, and the gas injection assembly 50 is used for injecting mixed gas with higher gas content into the second combustion chamber 70, so that a high-temperature low-oxygen state is formed in the second combustion chamber 70, and the water heater has better combustion efficiency, is beneficial to improving the energy efficiency of the water heater, and saves gas resources.

Claims (11)

1. A burner, comprising:

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 so as to form high-temperature flue gas and conveying the high-temperature flue gas to the second combustion chamber;

the gas injection assembly is arranged in the burner main body and used for accessing the mixed gas input by the pre-distribution device and conveying the mixed gas to the second combustion chamber so as to enable the second combustion chamber to carry out high-temperature air combustion reaction; and

and the air supplementing device is arranged on the burner main body, is communicated with the preheating combustion device and is used for inputting air to the preheating combustion device 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.

2. The burner of claim 1, wherein the preheat burner apparatus comprises:

the preheating burner is arranged on the burner main body and used for delivering gas to the first combustion chamber for combustion; and

the gas distribution mechanism is arranged on the burner main body, the preheating burner is connected with the pre-distribution device through the gas distribution mechanism, and the air supply device is connected with the gas distribution mechanism so as to input air to the preheating burner through the gas distribution mechanism.

3. The burner of claim 2, wherein a gas mixing chamber is formed in the gas distribution mechanism, a porous plate is arranged in the gas mixing chamber, and the gas input to the gas distribution mechanism by the gas supplementing device and the pre-distribution device enters the preheating combustion device through the porous plate.

4. The burner of claim 3, wherein the plurality of perforated plates are spaced apart and the holes of adjacent perforated plates are offset from one another.

5. The burner of claim 4, wherein the air supply has a gas input for receiving air and a gas output for communicating with the gas mixing chamber, the output of the air supply being disposed on a side of the perforated plate adjacent to the predistribution means.

6. The burner of any of claims 1 to 5, wherein the gas injection assembly comprises:

the shell is arranged in the burner main body, a gas distribution chamber is formed in the shell, and the shell is connected with the pre-distribution device through a gas distribution pipe; and

and the nozzle is arranged on the shell and communicated with the gas distribution chamber, and is used for conveying gas to the second combustion chamber.

7. The burner of claim 6, wherein the number of nozzles is a plurality of nozzles, the plurality of nozzles being spaced apart such that the inner diameter of the nozzles proximate the gas distribution tube is smaller than the inner diameter of the nozzles distal from the gas distribution tube.

8. The burner of any of claims 1 to 5, wherein the predistribution means comprises:

the pre-mixer is arranged on the burner main body and used for connecting gas and air to form mixed gas, and the preheating combustion device and the gas injection assembly are respectively connected with the pre-mixer.

9. The burner of claim 8, wherein the pre-dispensing means further comprises:

the pre-distribution chamber is arranged on the burner main body and connected with the premixer, and the preheating combustion device and the gas injection assembly are respectively connected with the premixer through the pre-distribution chamber.

10. A water heater, comprising:

a body;

a burner as claimed in any one of claims 1 to 9, provided in the body; and

and the heat exchanger is arranged on the machine body and communicated with the second combustion chamber of the combustor.

11. The water heater as recited in claim 10, further comprising:

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

the controller is electrically connected with the machine body and the temperature sensor and is used for acquiring the temperature in the second combustion chamber and the heat load required by the water heater; and the gas injection assembly is also used for controlling the gas injection assembly to inject gas into the second combustion chamber when the temperature in the second combustion chamber reaches a preset temperature, so that the second combustion chamber is subjected to high-temperature air combustion, and the range of the heat load required by the water heater is reached.

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