Burners and gas water heaters

Abstract

The present invention discloses a burner and a gas water heater. The burner comprises a shell, an air inlet assembly, a gas assembly, an atmospheric burner and a gas injection pipe. The shell forms an air inlet chamber, a first combustion chamber and a second combustion chamber. The air inlet assembly is connected to air. The gas assembly is connected to gas. The atmospheric burner is used to ignite the mixed gas in the first combustion chamber and heat the temperature in the first combustion chamber to a preset temperature. The gas injection pipe is connected to the second combustion chamber to inject gas into the second combustion chamber, so that high-temperature air combustion is performed in the second combustion chamber. The present invention provides a burner and a gas water heater with high-temperature air combustion function.

Description

[0001] This application claims priority to Chinese patent application filed on October 17, 2019, with application number 201910992986.8 and application name “BURNER AND GAS WATER HEATER”, the entire text of which is hereby incorporated by reference. Technical Field

[0002] The present invention relates to the technical field of high-temperature air combustion, and in particular to a burner and a gas water heater. Background Art

[0003] High temperature air combustion is called "mild and deep low oxygen dilution combustion", or gentle combustion for short. It is a new type of combustion method, also known as MILD combustion. The main characteristics of this combustion are: the chemical reaction mainly occurs in a high temperature and low oxygen environment, the reactant temperature is higher than its natural temperature, and the maximum temperature rise during the combustion process is lower than its natural temperature. The oxygen volume fraction is diluted by the combustion products to an extremely low concentration, usually 3% to 5%. Compared with conventional combustion, in this combustion state, the pyrolysis of the fuel is suppressed, the flame thickness becomes thicker, and the flame front disappears, so that the temperature of the entire furnace is very uniform during this combustion, reducing the generation of thermal nitrogen oxides, and significantly reducing the emission of pollutants NOx and CO.

[0004] Although high temperature air combustion has many advantages as mentioned above, it is currently only used in industrial applications and not in daily life. Summary of the invention

[0005] The main purpose of the present invention is to provide a burner and a gas water heater with high-temperature air combustion function.

[0006] To achieve the above object, the present invention provides a burner, comprising:

[0007] A housing is formed with an air intake chamber, a first combustion chamber and a second combustion chamber which are connected in sequence;

[0008] An air inlet assembly, used for receiving external air;

[0009] Gas assembly, used for connecting gas;

[0010] an atmospheric burner, used for igniting the mixed gas in the first combustion chamber and heating the temperature in the first combustion chamber to a preset temperature; and

[0011] A gas injection pipe, a gas outlet of the gas injection pipe is connected to the second combustion chamber, so as to inject gas into the second combustion chamber, so that high-temperature air combustion is performed in the second combustion chamber.

[0012] In one embodiment, the atmospheric burner has a mixed gas distribution chamber, the air inlet of the mixed gas distribution chamber is connected to the air inlet assembly and the gas assembly respectively, and the air outlet of the mixed gas distribution chamber is connected to the first combustion chamber.

[0013] In one embodiment, the first combustion chamber forms an ignition region at the ignition location;

[0014] The burner further includes an enclosure member, which is disposed in the first combustion chamber and surrounds the ignition area.

[0015] In one embodiment, the enclosure comprises an annular baffle disposed on a circumferential side of the ignition area.

[0016] In one embodiment, the enclosure is provided with an air supply hole connecting the first combustion chamber and the ignition area;

[0017] A plurality of the air supply holes are arranged on the enclosure member at intervals along the circumferential direction of the ignition area.

[0018] In one embodiment, the gas supplement hole is arranged on the enclosure member close to the gas outlet of the mixed gas distribution chamber.

[0019] In one embodiment, the annular baffle is arranged to be tapered in a direction close to the gas outlet of the mixed gas distribution chamber.

[0020] In one embodiment, the mixed gas distribution chamber is bent along the flow direction of the mixed gas.

[0021] In one embodiment, the gas inlet of the mixed gas distribution chamber is arranged to be tapered along the flow direction of the mixed gas.

[0022] In one embodiment, the atmospheric burner includes a shell forming the mixed gas distribution chamber, a combustion assembly arranged at the gas outlet of the mixed gas distribution chamber, and an ignition device arranged in the first combustion chamber and used to ignite the combustion assembly.

[0023] In one embodiment, the atmospheric burner is disposed in the air intake chamber;

[0024] A plurality of the mixed gas distribution chambers are arranged in the air intake chamber at intervals, and an air flow channel is defined between every two adjacent mixed gas distribution chambers.

[0025] In one embodiment, the gas assembly is connected to a plurality of the mixed gas distribution chambers via a gas distribution rod.

[0026] In one embodiment, the gas outlet of the gas distribution rod and the gas inlet of the mixed gas distribution chamber are arranged at a distance, so as to connect the mixed gas distribution chamber and the air inlet chamber at the distance; and / or,

[0027] The atmospheric burner comprises a shell forming a plurality of the mixed gas distribution chambers, and the shell is provided with a receiving cavity for receiving the gas distribution rods.

[0028] In one embodiment, the air inlet assembly includes a first housing formed with an air inlet duct, and a fan, wherein the fan is arranged in the air inlet duct, and the air outlet of the air inlet duct is respectively connected to the air inlet of the air inlet chamber and the air inlet of the mixed gas distribution chamber.

[0029] In one embodiment, the gas assembly includes a second housing and a gas switching valve, the second housing is formed with two gas flow channels, the two gas flow channels are respectively connected to the air inlet of the mixed gas distribution chamber and the gas inlet of the gas injection pipe, and the gas switching valve is arranged on the gas flow channels.

[0030] In one embodiment, a plurality of gas outlets of the gas injection pipe are arranged at intervals on the side of the shell.

[0031] In one embodiment, the housing is provided with a viewing window at the second combustion chamber.

[0032] In one embodiment, the burner also includes a flame sensing device, which is disposed in the first combustion chamber and close to the atmospheric burner. The flame sensing device is used to detect whether the atmospheric burner is in a burning state. When it is detected that it is not in a burning state, the atmospheric burner is controlled to re-ignite.

[0033] In one embodiment, the burner further includes a temperature measuring device, which is disposed in the second combustion chamber and is used to detect whether the temperature in the second combustion chamber reaches a preset target temperature.

[0034] In one embodiment, the oxygen concentration in the second combustion chamber is lower than 5% to 10%.

[0035] In addition, to achieve the above-mentioned purpose, the present invention also provides a gas water heater, including a heat exchanger and a burner, wherein the burner includes:

[0036] A housing is formed with an air intake chamber, a first combustion chamber and a second combustion chamber which are connected in sequence;

[0037] An air inlet assembly, used for receiving external air;

[0038] Gas assembly, used for connecting gas;

[0039] An atmospheric burner having a mixed gas distribution chamber, wherein an air inlet of the mixed gas distribution chamber is respectively connected to the air inlet assembly and the gas assembly, and an air outlet of the mixed gas distribution chamber is connected to the first combustion chamber, wherein the atmospheric burner is used to ignite the mixed gas discharged from the mixed gas distribution chamber into the first combustion chamber and heat the temperature in the first combustion chamber to a preset temperature; and

[0040] a gas injection pipe, wherein a gas outlet of the gas injection pipe is in communication with the second combustion chamber, so as to inject gas into the second combustion chamber, so that high-temperature air combustion is performed in the second combustion chamber;

[0041] The heat exchanger produces hot water using the heat generated by the burner.

[0042] In the technical solution provided by the present invention, the atmospheric burner ignites and mixes the air provided by the air inlet component and the gas provided by the gas component, thereby achieving high-temperature preheated air; and then the gas injected through the gas injection pipe cooperates to produce a suction effect, so that the high-temperature flue gas refluxes, on the one hand, to achieve heat preservation, so that the gas in the second combustion chamber can spontaneously ignite, and on the other hand, to dilute the air so that the oxygen concentration is lower than a certain value, so as to achieve uniform combustion, so that high-temperature air combustion occurs in the second combustion chamber. The present invention provides a burner with a high-temperature air combustion function. The structure of the burner frame can miniaturize the components that realize high-temperature air combustion, and has more application space and value. In addition, it has the characteristics of low noise, full combustion and low exhaust gas pollution. When applied to gas water heaters and related products and equipment including gas wall-mounted boilers that use gas combustion to generate high-temperature hot water for family bathing and heating, it not only meets the requirements, but also brings the effects of full combustion and low pollutant emissions that the burners in existing water heaters do not have. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0044] Figure 1 A cross-sectional schematic diagram of an embodiment of a burner provided by the present invention;

[0045] Figure 2 for Figure 1 The enlarged schematic diagram of point A in the middle;

[0046] Figure 3 for Figure 1 Schematic cross-section of a mid-atmospheric burner.

[0047] Description of Figure Numbers:

[0048]

[0049]

[0050] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] The purpose of the present invention is to utilize the characteristics of high-temperature air combustion to design a new type of burner and apply it to a gas water heater, so that the gas water heater can effectively reduce the emission of CO and NOx and reduce the noise of the gas water heater.

[0053] The present invention proposes a burner suitable for gas water heaters and related products and equipment including gas wall-mounted boilers that use gas combustion to generate high-temperature hot water for home bathing and heating, etc. For ease of understanding, the following application to gas water heaters is taken as an example. Figures 1 to 3 An embodiment of a burner provided by the present invention.

[0054] See also Figures 1 to 3 The burner provided by the present invention includes a shell 1, an air inlet assembly 2, a gas assembly 3, an atmospheric burner 4 and a gas injection pipe 5, wherein the shell 1 is formed with an air inlet chamber 11, a first combustion chamber 12 and a second combustion chamber 13 which are connected in sequence; the air inlet assembly 2 is used to connect external air; the gas assembly 3 is used to connect gas; the atmospheric burner 4 is used to ignite the mixed gas in the first combustion chamber 12 and heat the temperature in the first combustion chamber 12 to a preset temperature; the gas outlet of the gas injection pipe 5 is connected to the second combustion chamber 13, so as to inject gas into the second combustion chamber 13, so that high-temperature air combustion is performed in the second combustion chamber 13.

[0055] The main characteristics of high-temperature air combustion are: chemical reactions need to occur in a high-temperature, low-oxygen environment, the reactant temperature 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 to an extremely low concentration by the combustion products. Compared with conventional combustion, in this combustion state, the pyrolysis of the fuel is suppressed, the flame thickness becomes thicker, and the flame front disappears, so that the temperature in the entire furnace is very uniform, the peak combustion temperature is low and the noise is extremely low, and the pollutant NOx and CO emissions are greatly reduced. However, achieving high-temperature air combustion requires certain conditions: 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 combusted and burned evenly, and the temperature must be higher than the auto-ignition point of the fuel to maintain auto-ignition.

[0056] In this embodiment, the air inlet assembly 2 provides external air for the atmospheric burner 4, and the gas assembly 3 provides gas for the atmospheric burner 4. The atmospheric burner 4 mixes the air and the gas to form a mixed gas. The atmospheric burner 4 ignites the mixed gas so that the mixed gas is fully burned and forms a high temperature in the area, thereby being able to preheat the air entering the first combustion chamber 12 from the air inlet chamber 11 to a target temperature to form high-temperature flue gas. It can be understood that by controlling the heating temperature, the air in the first combustion chamber 12 can be heated to a target temperature, that is, the preset temperature mentioned above, so that the high-temperature preheating of the air is achieved. The high-temperature air circulates to the second combustion chamber 13; the gas injection pipe 5 injects gas into the second combustion chamber 13, and the gas is ignited by the high-temperature gas and continues to burn in the second combustion chamber 13, forming a jet combustion area, and the gas injected at a preset speed cooperates with the high-temperature flue gas to form a suction effect in the second combustion chamber 13, forming a flue gas reflux area, so that part of the high-temperature flue gas (waste gas rich in N2 and CO2) is strongly circulated internally in the second combustion chamber 13 to dilute the reactants, and then the injected gas and air are fully diluted to form a lower oxygen concentration, reduce the combustion reaction speed, and continue to maintain a higher temperature in the second combustion chamber 13, ensuring that the temperature in the second combustion chamber 13 is higher than the auto-ignition point of the fuel, achieving auto-ignition, and thus achieving high-temperature air combustion.

[0057] It should be noted that this embodiment uses high-temperature preheated air and high-speed jets to achieve entrainment and dilution of high-temperature flue gas, so that the gas and air in the second combustion chamber 13 are evenly mixed, so that the oxygen concentration in the second combustion chamber 13 is also balanced and lower than a certain value. In this way, not only can the gas be fully burned during combustion, which reduces the emission of pollutants, but also the second combustion chamber 13 will burn evenly, and there will be no problem of excessive local combustion and noise. In addition, the high-temperature flue gas is also refluxed by high-speed jet entrainment, so that the temperature of the second combustion chamber 13 can be kept higher than the auto-ignition point of the fuel, and combustion can be maintained as long as the gas is continuously introduced. The heat after combustion can be exchanged with the heat exchanger of the gas water heater to achieve the production of hot water. Among them, the second combustion chamber 13 can be provided with a flue gas outlet 131, and the exhaust gas after combustion is discharged through the flue gas outlet 131.

[0058] In addition, the target temperature of the high-temperature preheated air cannot be too low, and should not be lower than 600 degrees Celsius as much as possible. Generally, it is controlled at 600 to 1200 degrees Celsius to ensure that when the high-temperature gas contacts the gas in the second combustion chamber 13, good automatic combustion is achieved, and ignition is no longer required. There are many ways to achieve high-temperature preheated air, such as controlling the heating time, controlling the ratio of gas to air, keeping warm, and increasing the residence time of the high-temperature gas in the second combustion chamber 13.

[0059] In this embodiment, the oxygen concentration in the second combustion chamber 13 is lower than 5% to 10%. Since the injection speed of the gas injection pipe 5 is usually predetermined and set by experiments, and will not change substantially during the subsequent operation of the burner, the oxygen concentration in the second combustion chamber 13 can be adjusted by adjusting the real-time air volume in the second combustion chamber 13, thereby achieving control of the ratio of gas to air. The specific implementation of the control of the oxygen concentration in the second combustion chamber 13 is not difficult, and will not be described in detail here. The oxygen concentration in the second combustion chamber 13 can be controlled according to the size of the second combustion chamber 13 and the speed of controlling the injection.

[0060] In this embodiment, the atmospheric burner 4 ignites and mixes the air provided by the air inlet component 2 and the gas provided by the gas component 3, so as to achieve high-temperature preheated air; and then the gas injected through the gas injection pipe 5 cooperates to produce a suction effect, so that the high-temperature flue gas refluxes, on the one hand, to achieve heat preservation, so that the gas in the second combustion chamber 13 can self-ignite, and on the other hand, to dilute the air, so that the oxygen concentration is lower than a certain value, so as to achieve uniform combustion, so that high-temperature air combustion occurs in the second combustion chamber 13. The present invention provides a burner with a high-temperature air combustion function. The structure of the burner frame can miniaturize the components for realizing high-temperature air combustion, and has more application space and value. In addition, it has the characteristics of low noise, full combustion and low exhaust gas pollution. When applied to gas water heaters and related products and equipment including gas wall-mounted boilers that use gas combustion to generate high-temperature hot water for family bathing and heating, it not only meets the requirements, but also brings the effects of full combustion and low pollutant emissions that the burners in existing water heaters do not have.

[0061] It can be understood that the air inlet assembly 2 is connected to the atmospheric burner 4 to provide external air to the atmospheric burner 4, and the air inlet assembly 2 can also be connected to the air inlet chamber 11 to provide external air to the air inlet chamber 11; similarly, the gas assembly 3 is connected to the atmospheric burner 4 to provide gas to the atmospheric burner 4, and the gas assembly 3 can also be connected to the gas injection pipe 5 to provide gas to the gas injection pipe 5.

[0062] Based on the above, in one embodiment, the atmospheric burner 4 has a mixed gas distribution chamber 41, the air inlet of the mixed gas distribution chamber 41 is respectively connected to the air inlet assembly 2 and the gas assembly 3, and the air outlet of the mixed gas distribution chamber 41 is connected to the first combustion chamber 12. The mixed gas distribution chamber 41 is used to partially mix and ignite air and gas.

[0063] In one embodiment, the air inlet assembly 2 includes a first housing 21 formed with an air inlet duct (not shown in the drawings), and a fan 22, the fan 22 is arranged in the air inlet duct, and the air outlet of the air inlet duct is respectively connected to the air inlet of the air inlet chamber 11 and the air inlet of the mixed gas distribution chamber 41. By controlling the operation of the fan 22, the air flow in the air inlet duct can be adjusted accordingly; the air inlet duct can be provided with two air outlets, and the air outlets of the two air inlet ducts are respectively connected to the air inlet of the air inlet chamber 11 and the air inlet of the mixed gas distribution chamber 41; or, the air inlet duct can be provided with one air outlet, and the air outlet of the air inlet duct is connected to the air inlet of the air inlet chamber 11, and the air inlet chamber 11 is connected to the air inlet of the mixed gas distribution chamber 41. Furthermore, a valve body assembly (not shown in the drawings) may be provided at the air outlet of the air inlet duct, and the opening and closing of the air inlet duct and the adjustment of the specific opening size may be controlled by controlling the operation of the valve body assembly, which will not be described in detail here.

[0064] In one embodiment, the gas assembly 3 includes a second housing 31 and a gas switch valve 32. The second housing 31 is formed with two gas flow passages (not shown in the drawings). The two gas flow passages are respectively connected to the air inlet of the mixed gas distribution chamber 41 and the gas inlet of the gas injection pipe 5. The gas switch valve 32 is arranged on the gas flow passage. Specifically, the gas assembly 3 can be provided with an air intake pipeline, which is respectively in communication with the two gas flow passages to provide gas to the two gas flow passages respectively; the number of gas switch valves 32 is not limited, and can be arranged on the air intake pipeline, on at least one gas flow passage, or on the air intake pipeline and two gas flow passages, so as to close or open the corresponding air intake pipeline or gas flow passage according to actual needs, or specifically adjust the gas flow of the corresponding air intake pipeline or gas flow passage.

[0065] The atmospheric burner 4 includes a housing 42 forming a mixed gas distribution chamber 41, a combustion assembly 43 arranged at the gas outlet of the mixed gas distribution chamber 41, and an ignition device 44 arranged in the first combustion chamber 12 and used to ignite the combustion assembly 43. The mixed gas distribution chamber 41 provides sufficient space for the mixed gas to be fully mixed, and is also conducive to smoothing the flow rate of the mixed gas, so that the mixed gas can flow to the combustion assembly 43 in a uniform and stable state, and achieve full and stable combustion; the combustion assembly 43 may, for example, include a plate-like body (not shown in the drawings), and a plurality of gas holes (not shown in the drawings) for the mixed gas to pass through are arranged in the thickness direction of the plate-like body, which is conducive to the uniform combustion of the mixed gas; of course, the specific form of the ignition device 44 is also not limited, and the ignition device 44 may be, for example, an electronic igniter or an electric heating wire, which will not be described in detail here. It should be noted that the ignition device 44 is arranged to be closer to the combustion assembly 43, so that the mixed gas entering the combustion chamber from the mixed gas distribution chamber 41 can be quickly ignited without loss.

[0066] The atmospheric burner 4 is arranged in the air intake chamber 11, and the air intake of the atmospheric burner 4 can be connected to the air intake chamber 11, or directly connected to the air intake assembly 2; the number of mixed gas distribution chambers 41 arranged in the air intake chamber 11 is not limited, and can be set to one or more; when the number of mixed gas distribution chambers 41 arranged in the air intake chamber 11 is multiple, the multiple mixed gas distribution chambers 41 are arranged at intervals, and an air flow channel 14 is defined between every two adjacent mixed gas distribution chambers 41. In this way, one or more air flow channels 14 can be formed in the air intake chamber 11, ensuring that the air flow channel 14 is adjacent to the mixed gas distribution chamber 41, so that it can be closer to the combustion assembly 43 located at the air outlet of the mixed gas distribution chamber 41, and realize rapid high-temperature preheating; and multiple air flow channels 14 help to disperse the circulation of air, so that the air flows evenly to the air outlet of each mixed gas distribution chamber 41, thereby improving the high-temperature preheating efficiency. It should be noted that each mixed gas distribution chamber 41 may be formed in one atmospheric burner 4 , or at least two mixed gas distribution chambers 41 may be formed in one atmospheric burner 4 .

[0067] When there are multiple mixed gas distribution chambers 41, the gas assembly 3 is connected to the multiple mixed gas distribution chambers 41 through the gas distribution rod 7. The gas distribution rod 7 includes a tubular body (not shown in the drawings), the tubular body has a gas inlet and multiple gas outlets, the gas outlet of the gas assembly 3 is connected to the gas inlet of the tubular body, so that the gas diffuses in the tubular body to each gas outlet, and each gas outlet can be connected to a corresponding gas inlet of a mixed gas distribution chamber 41 to provide gas to each mixed gas distribution chamber 41.

[0068] Furthermore, in one embodiment, the gas outlet of the gas distribution rod 7 and the gas inlet of the mixed gas distribution chamber 41 are arranged at intervals, so as to connect the mixed gas distribution chamber 41 with the air intake chamber 11 at the interval. In this way, the gas can enter the mixed gas distribution chamber 41 through the gas outlet of the gas distribution rod 7, and the air can enter the mixed gas distribution chamber 41 from the air intake chamber 11 through the above-mentioned interval, forming a circulation state in which the air surrounds the gas, which is beneficial to increase the contact area between the air and the gas, thereby improving the mixing efficiency of the air and the gas.

[0069] Based on the above, the atmospheric burner 4 includes a housing 42 forming a plurality of mixed gas distribution chambers 41; the housing 42 is provided with a receiving cavity 45 for receiving the gas distribution rod 7. The tubular body of the gas distribution rod 7 is received in the receiving cavity 45, which reduces the space occupied by the atmospheric burner 4 and the gas distribution rod 7 at the connection point, thereby making the overall structure of the burner more compact.

[0070] In one embodiment, the mixed gas distribution chamber 41 is bent along the flow direction of the mixed gas. The flow direction of the mixed gas is the direction from the air inlet of the mixed gas distribution chamber 41 to the air outlet of the mixed gas distribution chamber 41; the bent mixed gas distribution chamber 41 helps to extend the flow path of the mixed gas as much as possible in the limited space inside the shell of the atmospheric burner 4, thereby promoting the full mixing of the mixed gas, so that when the mixed gas flows to the combustion assembly 43, the combustion is more complete.

[0071] In one embodiment, the air inlet of the mixed gas distribution chamber 41 is set in a constricted manner along the flow direction of the mixed gas. The constricted setting makes the cross-sectional area of ​​the mixed gas distribution chamber 41 have a trend of first decreasing and then increasing; specifically, the air inlet of the mixed gas distribution chamber 41 is set to have a larger diameter, which helps to increase the flow of gas and air, so that more mixed gas can enter the mixed gas distribution chamber 41 faster; then, the cross-sectional area of ​​the mixed gas distribution chamber 41 is set to gradually decrease, so that the gas and air are concentrated, which helps the gas and air to mix quickly to form a mixed gas; finally, the cross-sectional area of ​​the mixed gas distribution chamber 41 is set to gradually increase, which helps to gradually reduce the flow rate of the mixed gas, so that the state of the mixed gas is gradually smooth, so that enough time can be reserved for the mixed gas to be fully mixed.

[0072] Furthermore, in the above embodiment, the burner further includes a flame sensing device 46, which is disposed in the first combustion chamber 12 and close to the atmospheric burner 4. The flame sensing device 46 is used to detect whether the atmospheric burner 4 is in a combustion state, and to control the atmospheric burner 4 to re-ignite when it is detected that it is not in a combustion state. By providing the flame sensing device 46, the combustion state of the combustion assembly 43 can be monitored in real time, such as the size of the combustion flame, the combustion range, and the combustion temperature, etc., which helps to timely determine whether the combustion state is abnormal, ensure the normal operation of the atmospheric burner 4, and help to ensure the MILD combustion quality in the second combustion chamber 13.

[0073] In order to further ensure that the combustion temperature in the second combustion chamber 13 is higher than the auto-ignition point of the fuel, in one embodiment, the burner further includes a temperature measuring device 47, which is disposed in the second combustion chamber 13 and is used to detect whether the temperature in the second combustion chamber 13 reaches a preset target temperature. Through real-time monitoring by the temperature measuring device 47, when an abnormal temperature in the second combustion chamber 13 is detected, the user can be reminded or feedback can be given to the control device of the burner for processing.

[0074] It is understandable that, in one embodiment, the burner may be additionally provided with a control device, which may be independent of the control system of the gas water heater, or constitute a part of the control system of the gas water heater. The control device of the burner may be electrically connected to the flame sensing device 46, the ignition device 44, and the temperature measuring device 47 in the above embodiment, so as to automatically control the flame sensing device 46, the ignition device 44, and the temperature measuring device 47, etc., to realize the intelligence of the burner. Among them, the control device may be a control chip or a control circuit, which will not be described in detail here.

[0075] Furthermore, in the above embodiment, the temperature measuring device 47 is disposed near the flue gas outlet 131. This helps prevent the measurement result of the temperature measuring device 47 from being affected by the combustion assembly 43 or the ignition device 44, etc., and improves the accuracy of the sensing result. In application, when the temperature of the gas in the second combustion chamber 13 does not reach the target temperature, that is, it indicates that the combustion in the second combustion chamber 13 is unbalanced, the air intake volume of the air intake chamber 11 entering the second combustion chamber 13, or the ratio of the gas and air entering the first combustion chamber 12 from the atmospheric burner 4 can be adjusted. When the temperature of the gas in the second combustion chamber 13 reaches the target temperature, that is, it indicates that the combustion in the second combustion chamber 13 is normal, and the full MILD combustion in the second combustion chamber 13 can be ensured, ensuring low CO&NOX emissions during the entire combustion process.

[0076] In one embodiment, the housing 1 is provided with a visual window 8 at the second combustion chamber 13. There are various technical solutions for the visual window 8. For example, the visual window 8 may be a through-hole structure provided on the housing 1, the through-hole structure being connected to the second combustion chamber 13, a transparent panel being installed at the through-hole structure, for the user to observe the combustion situation in the second combustion chamber 13 through the transparent panel; the visual window 8 may also be a display screen, which displays the image information in the second combustion chamber 13 in real time for the user to confirm the combustion situation in the second combustion chamber 13, wherein the image information in the second combustion chamber 13 may be obtained by an imaging device shooting toward the second combustion chamber 13, and the communication method between the imaging device and the display screen is a mature technology, which will not be described in detail here.

[0077] In one embodiment, a plurality of gas outlets of the gas injection pipe 5 are arranged at intervals on the side of the shell 1. The plurality of gas outlets can be arranged on one side of the shell 1, or can be arranged in a dispersed manner along the circumference of the shell 1; the arrangement of the plurality of gas outlets enables the gas injection pipe 5 to perform high-speed jets on the gas in the second combustion chamber 13 from multiple directions, so that more flue gas circulates strongly in the second combustion chamber 13, and then fully dilutes the gas in the second combustion chamber 13, forming a lower oxygen concentration, reducing the combustion reaction speed, and maintaining a higher temperature in the second combustion chamber 13, ensuring that the temperature in the second combustion chamber 13 is higher than the auto-ignition point of the fuel, achieving auto-ignition, and ensuring that the MILD combustion in the second combustion chamber 13 is fully carried out.

[0078] In one embodiment, the first combustion chamber 12 forms an ignition area at the ignition position; the burner further comprises a baffle 6, which is disposed in the first combustion chamber 12 and surrounds the ignition area. The baffle 6 can gather the mixed gas discharged from the mixed gas distribution chamber 41 to the first combustion chamber 12, so as to facilitate combustion and generate smoke, and help reduce mutual interference between the ignition area and the gas in the first combustion chamber 12.

[0079] There are many technical solutions for the enclosure 6 to achieve the above functions. The enclosure 6 can be set in a plate shape, and the enclosure 6 and the chamber wall of the first combustion chamber 12 are enclosed together and set on the periphery of the ignition area; of course, the enclosure 6 can also be an annular baffle set on the periphery of the ignition area. The annular baffle can be set in an integral shape, or it can be composed of a plurality of plate-shaped components. The enclosure 6 is set corresponding to the ignition area, and the ignition area is set corresponding to the flame formed by the combustion of the combustion component 43, and can be set to one or more. On the one hand, the enclosure 6 at least separates the ignition area near the flame from the first combustion chamber 12, so that the air entering the first combustion chamber 12 through the air intake chamber 11 will not interfere with the combustion in the ignition area; on the other hand, the enclosure 6 helps to surround and gather the mixed gas discharged from the outlet of the mixed gas distribution chamber 41 to the first combustion chamber 12, so that the mixed gas gathers at the ignition point of the combustion component 43, which helps to fully carry out the combustion.

[0080] Furthermore, in one embodiment, the enclosure 6 is provided with an air supply hole 61 connecting the first combustion chamber 12 and the ignition area. The air supply hole 61 allows part of the air to enter the ignition area from the first combustion chamber 12, and adjusts the ratio of air to gas in the ignition area, so that the mixed gas is fully burned and generates a high enough temperature to preheat the air.

[0081] Furthermore, a plurality of air supply holes 61 are arranged at intervals along the circumference of the ignition area on the enclosure 6. In this way, air can enter the ignition area from multiple directions through the plurality of air supply holes 61, which helps to disperse the air and allow the air to mix into the mixed gas more quickly.

[0082] In one embodiment, the air supply hole 61 is provided on the enclosure 6 near the air outlet of the mixed gas distribution chamber 41. In this way, the air can directly participate in the combustion after entering the ignition area through the air supply hole 61, thereby preventing the air from diffusing away from the flame in the ignition area and affecting the combustion condition of the ignition area.

[0083] It should be noted that the air supply hole 61 can be directly in the shape of a through hole, or an adjustment structure can be set at the air supply hole 61. The adjustment structure, such as a valve body, can adjust the opening of the air supply hole 61 according to actual needs, thereby correspondingly adjusting the air intake of the air supply hole 61.

[0084] In one embodiment, the annular baffle is arranged to be tapered in the direction close to the gas outlet of the mixed gas distribution chamber 41. In this way, the mixed gas is discharged from the gas outlet of the mixed gas distribution chamber 41 and gathered near the combustion assembly 43, so that the combustion assembly 43 can be fully burned.

[0085] In addition, the present invention also provides a gas water heater, which includes a heat exchanger 92 and the burner as described above. Of course, the gas water heater includes a main body, in which a heat exchange chamber 91 and a smoke outlet 93 connected to the heat exchanger 92 are arranged. The heat exchanger 92 is arranged in the heat exchange chamber 91, and the smoke outlet 131 of the burner is connected to the heat exchange chamber 91. The heat exchanger 92 is connected to an external water source, such as tap water. The high-temperature smoke entering the heat exchange chamber 91 through the smoke outlet 131 of the burner carries enough heat to continuously heat the tap water in the heat exchanger 92, so that the temperature of the tap water is increased to the required level, thereby producing hot water.

[0086] The second combustion chamber 13 can be separately provided with the heat exchange chamber 91, or can be provided integrally with the heat exchange chamber 91. When the second combustion chamber 13 is provided integrally with the heat exchange chamber 91, it can be understood that the heat exchanger 92 can be directly provided in the second combustion chamber 13, so that the flue gas strongly circulated in the second combustion chamber 13 directly exchanges heat with the heat exchanger 92.

[0087] It should be noted that the detailed structure of the burner in the gas water heater can refer to the embodiment of the above-mentioned burner, which will not be repeated here; since the above-mentioned burner 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 above-mentioned burner, and the technical effects achieved are also exactly the same, which will not be repeated here.

Claims

1. A burner, characterized in that: The burner comprises: A housing is formed with an air intake chamber, a first combustion chamber and a second combustion chamber which are connected in sequence; An air inlet assembly, used for receiving external air; Gas assembly, used for connecting gas; an atmospheric burner, used for igniting the mixed gas in the first combustion chamber and heating the temperature in the first combustion chamber to a preset temperature; and a gas injection pipe, wherein a gas outlet of the gas injection pipe is in communication with the second combustion chamber, so as to inject gas into the second combustion chamber, so that high-temperature air combustion is performed in the second combustion chamber; The atmospheric burner has a mixed gas distribution chamber, the air inlet of the mixed gas distribution chamber is communicated with the air inlet assembly and the gas assembly respectively, and the air outlet of the mixed gas distribution chamber is communicated with the first combustion chamber; The first combustion chamber forms an ignition region at the ignition location; The burner further comprises a blocking member, which is disposed in the first combustion chamber and surrounds the ignition area; The enclosure comprises an annular baffle plate provided on the peripheral side of the ignition area; The enclosure is provided with a gas supply hole connecting the first combustion chamber and the ignition area; A plurality of gas supplement holes are arranged on the enclosure member at intervals along the circumference of the ignition area; A plurality of enclosure members are provided.

2. The burner according to claim 1, characterized in that The air supply hole is arranged on the enclosure member close to the air outlet of the mixed gas distribution chamber.

3. The burner according to claim 1, characterized in that The annular baffle is arranged to be tapered in a direction close to the gas outlet of the mixed gas distribution chamber.

4. The burner according to claim 1, characterized in that The mixed gas distribution chamber is arranged in a bent manner along the flow direction of the mixed gas.

5. The burner according to claim 1, characterized in that The air inlet of the mixed gas distribution chamber is arranged to be narrowed along the flow direction of the mixed gas.

6. The burner according to claim 1, characterized in that The atmospheric burner comprises a shell forming the mixed gas distribution chamber, a combustion assembly arranged at the gas outlet of the mixed gas distribution chamber, and an ignition device arranged in the first combustion chamber and used for igniting the combustion assembly.

7. The burner according to any one of claims 1 to 5, characterized in that: The atmospheric burner is arranged in the air intake chamber; A plurality of the mixed gas distribution chambers are arranged in the air intake chamber at intervals, and an air flow channel is defined between every two adjacent mixed gas distribution chambers.

8. The burner according to claim 7, characterized in that The gas assembly is communicated with a plurality of the mixed gas distribution chambers through a gas distribution rod.

9. The burner according to claim 8, characterized in that The gas outlet of the gas distribution rod and the gas inlet of the mixed gas distribution chamber are arranged at a distance, so that the mixed gas distribution chamber and the air inlet chamber are connected at the distance; and / or, The atmospheric burner comprises a shell forming a plurality of the mixed gas distribution chambers, and the shell is provided with a receiving cavity for receiving the gas distribution rods.

10. The burner according to claim 1, characterized in that The air inlet assembly includes a first housing formed with an air inlet duct, and a fan, wherein the fan is arranged in the air inlet duct, and an air outlet of the air inlet duct is respectively connected to an air inlet of the air inlet chamber and an air inlet of the mixed gas distribution chamber.

11. The burner according to claim 1, characterized in that The gas assembly includes a second housing and a gas switching valve. The second housing is formed with two gas flow passages, which are respectively connected to the air inlet of the mixed gas distribution chamber and the gas inlet of the gas injection pipe. The gas switching valve is arranged on the gas flow passages.

12. The burner according to claim 1, characterized in that A plurality of gas outlets of the gas injection pipe are arranged at intervals on the side of the shell.

13. The burner according to claim 1, characterized in that The housing is provided with a viewing window at the second combustion chamber.

14. The burner according to claim 1, characterized in that The burner also includes a flame sensing device, which is arranged in the first combustion chamber and close to the atmospheric burner. The flame sensing device is used to detect whether the atmospheric burner is in a burning state. When it is detected that it is not in a burning state, the atmospheric burner is controlled to re-ignite.

15. The burner according to claim 1, characterized in that The burner further comprises a temperature measuring device, which is disposed in the second combustion chamber and is used to detect whether the temperature in the second combustion chamber reaches a preset target temperature.

16. A gas water heater, characterized in that: The invention comprises a heat exchanger and the burner according to any one of claims 1 to 15, wherein the heat exchanger produces hot water by using the heat generated by the burner.

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