Burner and gas water heater

Abstract

The present invention discloses a burner and a gas water heater. The burner includes a housing, a premixer, a preheating burner, and a gas injection pipe. The housing forms a communicating air intake chamber and a combustion chamber. The premixer accesses gas and air, performs premixing, and supplies the mixed gas to the combustion chamber. The preheating burner ignites the mixed gas in the combustion chamber and heats the temperature in the combustion chamber to a preset temperature. The gas injection pipe has an injection port provided at the side of the combustion chamber for injecting gas into the combustion chamber, so that a high-temperature air combustion reaction occurs in the combustion chamber. The present invention realizes a burner and a gas water heater having a high-temperature air combustion function.

Description

[0001] This application claims the priority of a Chinese patent application with the application number 201910992986.8 and the application title "Burner and Gas Water Heater" filed on October 17, 2019, the entire content of which is incorporated herein by reference. Technical Field

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

[0003] High temperature air combustion is called "gentle and deep low-oxygen dilution combustion", abbreviated as gentle combustion, which 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 temperature of the reactants is higher than their natural temperature, and the maximum temperature rise during the combustion process is lower than their natural temperature. The volume fraction of oxygen is diluted to a very low concentration by the combustion products, usually 3% - 5%. Compared with conventional combustion, in this combustion state, the pyrolysis of fuel is inhibited, the flame thickness becomes thicker, and the flame front disappears, so that the temperature of the entire furnace is very uniform during this combustion, reducing the generation of thermal nitrogen oxides and significantly reducing the emissions of pollutants NOx and CO.

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

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

[0006] To achieve the above object, a burner proposed by the present invention includes:

[0007] A housing that forms an air intake chamber and a combustion chamber that are sequentially connected;

[0008] A premixer for accessing gas and air and performing premixing, and supplying the mixed gas to the combustion chamber;

[0009] A preheating burner for igniting the mixed gas in the combustion chamber and heating the temperature in the combustion chamber to a preset temperature; and,

[0010] A gas injection pipe having an injection port provided on the side of the combustion chamber, and the gas injection pipe is used to inject gas into the combustion chamber so that a high-temperature air combustion reaction occurs in the combustion chamber.

[0011] In one embodiment, a plurality of the injection ports are arranged at intervals along the circumferential direction of the combustion chamber.

[0012] In one embodiment, the gas injection pipe is arranged such that the gas ejected through the injection orifice forms a vortex in the combustion chamber.

[0013] In one embodiment, the combustion chamber has a flue gas outlet, and the gas injection pipe has a channel section connecting the injection orifice;

[0014] The channel section is inclined in a direction gradually away from the flue gas outlet in the direction close to the injection orifice.

[0015] In one embodiment, the gas injection pipe is arranged around the outer peripheral side of the housing;

[0016] The injection orifice of the gas injection pipe is arranged in the combustion chamber after passing through the housing.

[0017] In one embodiment, the air intake chamber has air inlets arranged on the side of the combustion chamber, and a plurality of the air inlets are arranged at intervals along the circumferential direction of the combustion chamber.

[0018] In one embodiment, the burner further includes an air duct housing, and the air duct housing is arranged around the outer peripheral side of the housing to jointly enclose the air intake chamber with the housing at the position where it is located.

[0019] In one embodiment, the preheating burner has a mixed gas distribution chamber, an inlet of the mixed gas distribution chamber is communicated with the premixer, and an outlet of the mixed gas distribution chamber is communicated with the combustion chamber.

[0020] In one embodiment, the preheating burner includes a housing forming the mixed gas distribution chamber, a combustion assembly arranged at the outlet of the mixed gas distribution chamber, and an ignition device arranged in the combustion chamber and used for igniting the combustion assembly.

[0021] In one embodiment, the air intake chamber has air inlets arranged on the side of the combustion chamber, and the air inlets are arranged close to the combustion assembly.

[0022] In one embodiment, the inlet of the mixed gas distribution chamber is flared in the direction towards the outlet of the mixed gas distribution chamber.

[0023] In one embodiment, the combustion chamber includes a first combustion chamber and a second combustion chamber that are sequentially communicated;

[0024] The first combustion chamber is respectively communicated with the outlet of the mixed gas distribution chamber and the outlet of the air intake chamber;

[0025] The second combustion chamber is communicated with the injection orifice of the gas injection pipe.

[0026] In one embodiment, the housing includes a first housing forming the first combustion chamber and a second housing forming the second combustion chamber;

[0027] The first housing and the second housing are detachably connected.

[0028] In one embodiment, the burner further includes a flame sensing device disposed in the combustion chamber and near the preheating burner. The flame sensing device is configured to detect whether the preheating burner is in a combustion state and, when it detects that the preheating burner is not in a combustion state, control the preheating burner to reignite.

[0029] In one embodiment, the burner further includes a temperature measuring device disposed in the combustion chamber. The temperature measuring device is configured to detect whether the temperature in the combustion chamber reaches a preset target temperature.

[0030] In one embodiment, the premixer includes a housing, a blower, and a gas switch valve. The housing is formed with an air inlet duct, a gas flow channel, and a mixing channel. The mixing channel is respectively communicated with the air inlet duct and the gas flow channel. The blower is disposed in the air inlet duct, and the gas switch valve is disposed in the gas flow channel. The mixing channel is communicated with the air inlet of the mixed gas distribution chamber.

[0031] In one embodiment, the preheating burner is a fully premixed burner.

[0032] In addition, to achieve the above object, the present invention further provides a gas water heater, which includes a heat exchanger and a burner. The burner includes:

[0033] A housing forming an air intake chamber and a combustion chamber that are sequentially communicated;

[0034] A premixer for introducing gas and air and performing premixing, and supplying the mixed gas to the combustion chamber;

[0035] A preheating burner for igniting the mixed gas in the combustion chamber and heating the temperature in the combustion chamber to a preset temperature; and,

[0036] A gas injection pipe having an injection port disposed on the side of the combustion chamber. The gas injection pipe is configured to inject gas into the combustion chamber so that a high-temperature air combustion reaction occurs in the combustion chamber.

[0037] The heat exchanger produces hot water by the heat generated by the burner.

[0038] In the technical solution provided by the present invention, the premixer provides a mixed gas of fuel gas and air; the preheating burner ignites the mixed gas and generates flue gas, achieving high-temperature preheating of air; then, fuel gas is injected through the fuel gas injection pipe through the injection port to cooperate to generate an entrainment effect, causing the high-temperature flue gas to flow back. On the one hand, heat preservation is achieved, enabling the fuel gas in the combustion chamber to auto-ignite, and on the other hand, the air is diluted, making the oxygen concentration lower than a certain value to achieve uniform combustion. Thus, high-temperature air combustion occurs in the combustion chamber. Moreover, the present invention provides a burner with the function of high-temperature air combustion. The structure of the burner frame can miniaturize the components for realizing high-temperature air combustion, having more application space and value. Additionally, it has the characteristics of low noise, complete combustion, and low pollution of the discharged waste gas. When applied to gas water heaters and related products and equipment such as gas wall-mounted boilers that use gas combustion to generate high-temperature hot water for household bathing and heating, etc., it not only meets the requirements but also brings the effects of complete combustion and low pollutant emissions that are not possessed by the burners in existing water heaters. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0040] Figure 1 It is a front view schematic diagram of an embodiment of the burner provided by the present invention;

[0041] Figure 2 For Figure 1 the left view schematic diagram of the burner in

[0042] Figure 3 For Figure 2 the cross-sectional schematic diagram at A-A in

[0043] Figure 4 For Figure 3 the enlarged schematic diagram at B in

[0044] Explanation of the reference numerals in the drawings:

[0045]

[0046]

[0047] The realization of the object of the present invention, functional characteristics, and advantages will be further described in conjunction with the embodiments with reference to the drawings. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0048] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0049] 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 gas water heaters, so that the gas water heater can effectively reduce the emissions of CO and NOx and reduce the noise of the gas water heater.

[0050] The present invention provides a burner, which is applied to gas water heaters and related products and equipment such as gas wall-mounted boilers that use gas combustion to generate high-temperature hot water for household bathing and heating. For the convenience of understanding, the application to a gas water heater is taken as an example below. Figures 1 to 4 This is an embodiment of the burner provided by the present invention.

[0051] Please refer to Figures 1 to 3 , the burner provided by the present invention includes a housing 1, a premixer 2, a preheating burner 3, and a gas injection pipe 4. Among them, the housing 1 is formed with an air intake chamber 11 and a combustion chamber 12 that are sequentially connected; the premixer 2 is used to access gas and air and perform premixing, and heat the temperature in the combustion chamber 12 to a preset temperature; the preheating burner 3 is used to ignite the mixed gas in the combustion chamber 12 and heat the temperature in the combustion chamber 12 to a preset temperature; the gas injection pipe 4 has an injection port 41 provided on the side of the combustion chamber 12, and the gas injection pipe 4 is used to inject gas into the combustion chamber 12, so that a high-temperature air combustion reaction occurs in the combustion chamber 12.

[0052] The main characteristics of high-temperature air combustion are: the chemical reaction needs to occur in a high-temperature and low-oxygen environment, the reactant temperature is higher than its autoignition temperature, and the maximum temperature rise during the combustion process is lower than its autoignition temperature, and the oxygen volume fraction is diluted to an extremely low concentration by the combustion products. Compared with conventional combustion, in this combustion state, the pyrolysis of the fuel is inhibited, the flame thickness becomes thicker, and the flame front disappears, so that the temperature in the entire furnace is very uniform, the combustion peak temperature is low and the noise is extremely small, and the emissions of pollutants NOx and CO 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% - 10%, to ensure that the gas is fully burned and burned evenly, and the temperature should be higher than the autoignition point of the fuel to maintain autoignition.

[0053] In the technical solution provided by the present invention, the premixer 2 is used to access gas and external air and perform premixing to form a more uniform mixed gas of gas and air; the premixer 2 conveys the mixed gas to the combustion chamber 12; the air intake chamber 11 is used to access external air and convey the air to the combustion chamber 12; the preheating burner 3 ignites the mixed gas in the combustion chamber 12, causing the mixed gas to burn and form a high temperature in the area, so as to be able to preheat the air entering the combustion chamber 12 through the air intake chamber 11 to a high temperature to form high-temperature flue gas. It can be understood that by controlling the heating temperature, the air in the combustion chamber 12 can be heated to the target temperature, that is, the preset temperature mentioned above. In this way, the high-temperature preheating of the air is achieved. The gas injection pipe 4 injects gas into the combustion chamber 12, and the gas is ignited by the high-temperature gas and continuously burns in the combustion chamber 12 to form an injection combustion area. Moreover, the gas injected at a preset speed cooperates with the high-temperature flue gas, and an entrainment effect will be formed in the combustion chamber 12 to form a flue gas recirculation area, so that part of the high-temperature flue gas (waste gas rich in N2 and CO2) circulates and dilutes the reactants inside the combustion chamber 12, and then fully dilutes the injected gas and air, forming a lower oxygen concentration, reducing the combustion reaction speed, and continuing to maintain a relatively high temperature in the combustion chamber 12, ensuring that the temperature in the combustion chamber 12 is higher than the autoignition point of the fuel, realizing autoignition, and thus realizing high-temperature air combustion. Among them, the injection port 41 is arranged on the side of the combustion chamber 12, so that the gas injected by the gas injection pipe 4 flows from the side of the combustion chamber 12 towards the middle of the combustion chamber 12, which helps to strengthen the circulation and reflux of the flue gas and realize heat preservation in the combustion chamber 12.

[0054] It should be noted that in this embodiment, by preheating the air at a high temperature and cooperating with high-speed jet to achieve entrainment and dilution of high-temperature flue gas, the gas and air in the combustion chamber 12 are mixed evenly. At the same time, the oxygen concentration in the combustion chamber 12 will also be balanced and lower than a certain value. In this way, not only can the gas be fully burned during combustion, but also the emission of pollutants is reduced. Moreover, the combustion in the combustion chamber 12 is uniform, and there will be no problem of local overburning and generating noise. In addition, the recirculation of high-temperature flue gas is realized through high-speed jet entrainment, so that the temperature in the combustion chamber 12 can be maintained higher than the autoignition point of the fuel, and the 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 produce hot water. Among them, the combustion chamber 12 can be provided with a flue gas outlet 13, and the exhaust gas after combustion is discharged through the flue gas outlet 13.

[0055] As described above, the target temperature of the high-temperature preheated air cannot be too low, preferably not lower than 600 °C. Generally, controlling it within the range of 600 to 1200 °C can ensure that when the high-temperature gas contacts the fuel gas in the combustion chamber 12, good auto-ignition occurs and there is no longer a need for ignition. There are various ways to achieve high-temperature preheated air. For example, it can be achieved by controlling the heating time, controlling the ratio of fuel gas to air, performing heat preservation, increasing the residence time of the high-temperature gas in the combustion chamber 12, etc.

[0056] In this embodiment, the oxygen concentration in the combustion chamber 12 is lower than 5% - 10%. Since the injection speed of the fuel gas injection pipe 4 is usually pre-determined and set through experiments and basically does not change during the subsequent operation of the burner, the oxygen concentration in the combustion chamber 12 can be adjusted by adjusting the real-time air intake volume in the combustion chamber 12, thereby achieving control of the ratio of fuel gas to air. Specifically, achieving control of the oxygen concentration in the combustion chamber 12 is not difficult, so it will not be elaborated here. The magnitude of the oxygen concentration in the combustion chamber 12 can be controlled according to the size of the combustion chamber 12 and the controlled injection speed.

[0057] It can be understood that in this embodiment, since a mixed gas containing fuel gas and air is provided by the pre-mixer 2, the preheating burner 3 ignites and burns the mixed gas to achieve high-temperature preheated air. Then, the fuel gas is injected through the fuel gas injection pipe 4 to cooperate and generate an entrainment effect, causing the high-temperature flue gas to flow back. On the one hand, heat preservation is achieved to make the temperature higher than the auto-ignition point of the fuel, enabling the fuel gas in the combustion chamber to auto-ignite. On the other hand, the air is diluted by jet entrainment to make the oxygen concentration lower than a certain value, achieving uniform combustion. Thus, high-temperature air combustion occurs in the combustion chamber. That is to say, the technical solution of this embodiment is conducive to simultaneously meeting these two conditions and smoothly achieving high-temperature air combustion. Moreover, this structure of the burner frame can miniaturize the components for achieving high-temperature air combustion, providing more application space and value. Additionally, with low noise, complete combustion, and less pollution from the exhaust gas, when applied to gas water heaters and related products and equipment such as gas wall-mounted boilers that use gas combustion to generate high-temperature hot water for household bathing and heating, etc., it not only meets the requirements but also brings the effects of complete combustion and low pollutant emissions that are not available in the burners of existing water heaters.

[0058] As described above, the preheating burner 3 has a mixed gas distribution chamber 31. The air inlet of the mixed gas distribution chamber 31 is connected to the pre-mixer 2, and the air outlet of the mixed gas distribution chamber 31 is connected to the combustion chamber 12. The mixed gas distribution chamber 31 receives the mixed gas of air and fuel gas from the pre-mixer 2 and discharges the mixed gas into the combustion chamber 12.

[0059] Of course, the preheating burner 3 described above can be a fully premixed burner for fully and evenly mixing and burning air and gas.

[0060] The premixer 2 includes a housing 21, a blower 22, and a gas switch valve (not shown in the drawings). The housing 21 is formed with an air inlet duct 23, a gas flow channel 24, and a mixing channel (not shown in the drawings). The mixing channel is respectively communicated with the air inlet duct 23 and the gas flow channel 24. The blower 22 is arranged in the air inlet duct 23, and the gas switch valve is arranged in the gas flow channel 24. The mixing channel is communicated with the air inlet of the mixed gas distribution chamber 31. The premixer 2 can be arranged in the air inlet chamber 11 or outside the housing 1 of the burner. When the premixer 2 is separately arranged outside the burner, it can be installed on the housing 1 by means of screw connection, snap connection, or adsorption fixation, etc. The blower 22 can be used to adjust the air flow rate and velocity in the air inlet duct 23; the gas switch valve can be used to close or open the gas flow channel 24 according to actual needs, and can also specifically adjust the gas flow rate in the gas flow channel 24, so as to cooperate with the blower 22 to realize the adjustment of the ratio of gas to air in the mixed gas entering the mixed gas distribution chamber 31.

[0061] The preheating burner 3 includes a housing 32 forming a mixed gas distribution chamber 31, a combustion assembly 33 arranged at the air outlet of the mixed gas distribution chamber 31, and an ignition device 34 arranged in the combustion chamber 12 and used for igniting the combustion assembly 33. The mixed gas distribution chamber 31 provides sufficient space for the mixed gas to be fully mixed, and also helps to smooth the flow rate of the mixed gas, so that the mixed gas can flow to the combustion assembly 33 in a uniform and stable state to achieve full and stable combustion; the combustion assembly 33 can include, for example, a plate-shaped body (not shown in the drawings), and a plurality of air holes (not shown in the drawings) for the mixed gas to pass through are arranged in the thickness direction of the plate-shaped body, which is beneficial to the uniform combustion of the mixed gas; of course, the specific form of the ignition device 34 is not limited either. The ignition device 34 can be, for example, an electronic igniter or an electric heating wire, which will not be elaborated here. It should be noted that the ignition device 34 is arranged closer to the combustion assembly 33, so that the mixed gas entering the combustion chamber 12 from the mixed gas distribution chamber 31 can be quickly ignited without loss.

[0062] Please refer to Figure 3, in one embodiment, the air inlet of the mixed gas distribution chamber 31 is flared in the direction towards the air outlet of the mixed gas distribution chamber 31. Roughly speaking, the cross-sectional area of at least the chamber section near the air inlet of the mixed gas distribution chamber 31 gradually increases in the direction from the air inlet to the air outlet of the mixed gas distribution chamber 31. Specifically, the cross-sectional area at the connection between the mixed gas distribution chamber 31 and the premixer 2 is set to be relatively small, so that the flow rate of the mixed gas entering the mixed gas distribution chamber 31 through the premixer 2 is increased, which helps to improve the flow rate of the mixed gas and enables the mixed gas to quickly enter the mixed gas distribution chamber 31; then, as the mixed gas continues to flow, since the cross-sectional area of the mixed gas distribution chamber 31 gradually increases within a certain range, it helps to gradually reduce the flow rate of the mixed gas, making the state of the mixed gas gradually stable, so that sufficient time can be reserved for the mixed gas to be fully mixed.

[0063] Furthermore, in the above embodiment, the burner further includes a flame sensing device 35. The flame sensing device 35 is disposed in the combustion chamber 12 and is close to the preheating burner 3. The flame sensing device 35 is used to detect whether the preheating burner 3 is in a combustion state, and when it detects that it is not in a combustion state, it controls the preheating burner 3 to re-ignite. By providing the flame sensing device 35, the combustion state of the combustion assembly 33 can be monitored in real time. The combustion state is, for example, 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 preheating burner 3, and help to guarantee the combustion quality of the high-temperature air in the combustion chamber 12.

[0064] Next, in order to further ensure that the combustion temperature in the combustion chamber 12 is higher than the auto-ignition point of the fuel, in one embodiment, the burner further includes a temperature measuring device 36. The temperature measuring device 36 is disposed in the combustion chamber 12, and the temperature measuring device 36 is used to detect whether the temperature in the combustion chamber 12 reaches a preset target temperature. Through the real-time monitoring of the temperature measuring device 36, when the temperature in the combustion chamber 12 is detected to be abnormal, it can remind the user or feedback to the control device of the burner for processing.

[0065] It can be understood that, in one embodiment, the burner can be additionally provided with a control device. This control device can be independent of the control system of the gas water heater or form a part of the control system of the gas water heater. The control device of the burner can be electrically connected to the flame sensing device 35, the ignition device 34, and the temperature measuring device 36 in the above embodiment, etc., so as to be able to automatically control the flame sensing device 35, the ignition device 34, and the temperature measuring device 36, etc., to realize the intelligentization of the burner. Among them, the control device can be a control chip or a control circuit, which will not be elaborated here.

[0066] Further, in the above embodiments, the temperature measuring device 36 is disposed close to the flue gas outlet 13. This helps prevent the measurement result of the temperature measuring device 36 from being affected by the combustion assembly 33 or the ignition device 34, etc., and improves the accuracy of the sensing result. During application, when the temperature of the gas in the combustion chamber 12 does not reach the target temperature, it indicates that the combustion in the combustion chamber 12 is unbalanced, and the air intake volume from the air intake chamber 11 into the combustion chamber 12 or the gas-to-air ratio of the preheating burner 3 entering the combustion chamber 12 can be adjusted. When the temperature of the gas in the combustion chamber 12 reaches the target temperature, it indicates that the combustion in the combustion chamber 12 is normal, which can ensure the full combustion of the high-temperature air in the combustion chamber 12 and ensure low CO&NOX emissions during the entire combustion process.

[0067] Please refer to Figure 3 and Figure 4 In an embodiment, the burner further includes an air duct housing 14, which is disposed around the outer peripheral side of the housing 1 to jointly enclose the air intake chamber 11 with the housing 1 at the location. The air intake chamber 11 is used to access external air and provides sufficient space for the air to flow smoothly. Setting the air intake chamber 11 on the side of the housing 1 can ensure the overall compact structure of the burner, and at the same time, the air intake chamber 11 can be set at the required position inside the burner, so that the air can quickly enter the combustion chamber 12 through the air intake chamber 11.

[0068] Further, in an embodiment, the air intake chamber 11 has an air supply port 111 disposed on the side of the combustion chamber 12, and the air supply port 111 is disposed close to the combustion assembly 33. In this way, the air entering the combustion chamber 12 through the air supply port 111 of the air intake chamber 11 can quickly reach the combustion assembly 33 and be quickly preheated to a high temperature under the combustion action of the combustion assembly 33, avoiding the diffusion of air with a temperature not reaching the preset target temperature in the middle and top regions of the combustion chamber 12 and affecting the combustion effect of the high-temperature air.

[0069] In addition, in the above embodiments, a plurality of air supply ports 111 of the air intake chamber 11 are arranged at intervals along the circumferential direction of the combustion chamber 12. Such a setting enables the air entering the combustion chamber 12 through the air intake chamber 11 to be evenly dispersed around the combustion assembly 33, which is beneficial to increasing the contact area between the air and the combustion area of the combustion assembly 33, that is, increasing the heat absorption area of the air and improving the efficiency of high-temperature preheating of the air.

[0070] Next, in this embodiment, the gas injection pipe 4 has an injection port 41. The gas injection pipe 4 injects gas into the combustion chamber 12 through the injection port 41. A plurality of injection ports 41 are arranged at intervals along the circumferential direction of the combustion chamber 12, so that the gas in the combustion chamber 12 can be jet-flowed at high speed from multiple directions, enabling more flue gas to strongly circulate in the combustion chamber 12. Subsequently, the gas in the combustion chamber 12 is fully diluted to form a lower oxygen concentration, reducing the combustion reaction rate, and maintaining a relatively high temperature in the combustion chamber 12, ensuring that the temperature in the combustion chamber 12 is higher than the auto-ignition point of the fuel to achieve auto-ignition and ensuring the full progress of the combustion of the high-temperature air in the combustion chamber 12.

[0071] In one embodiment, the gas injection pipe 4 is arranged such that the gas ejected through the injection port 41 forms a vortex in the combustion chamber 12, and the gas can drive the flue gas in the combustion chamber 12 to flow in a vortex shape, thereby helping to extend the reflux path of the flue gas in the combustion chamber 12 and enhancing the circulation and reflux effect of the flue gas in the combustion chamber 12 to achieve good heat preservation in the combustion chamber 12. It can be understood that there are various technical solutions to achieve the gas ejected through the injection port 41 to form a vortex in the combustion chamber 12. For example, by setting the gas injection pipe 4 to periodically inject gas, the gas entering the combustion chamber 12 through the injection port 41 flows periodically, generating a pressure difference in the combustion chamber 12 to form a vortex-shaped air flow; or, by setting the gas injection pipe 4 to have a plurality of injection ports 41, and the plurality of injection ports 41 are arranged at intervals along the outer periphery of a ring-shaped plane, and the orientation of each injection port 41 is set to be approximately the tangent direction of the ring-shaped outer periphery at the corresponding position, so that the gas entering the combustion chamber 12 through the plurality of injection ports 41 flows along a vortex-shaped path.

[0072] In one embodiment, the gas injection pipe 4 has a channel section 42 connecting the injection port 41; the channel section 42 is inclined in a direction gradually away from the flue gas outlet 13 in the direction close to the injection port 41. The channel section 42 can be formed on the main body of the gas injection pipe 4 or on the housing 1 communicating with the gas injection pipe 4; the inclined setting of the channel section 42 enables the gas ejected through the gas injection pipe 4 to flow in a direction away from the flue gas outlet 13, driving the flue gas in the combustion chamber 12 to circulate at a position away from the flue gas outlet 13, which helps to extend the reflux path of the flue gas and also helps with heat preservation in the combustion chamber 12.

[0073] The injection port 41 of the gas injection pipe 4 is arranged on the side of the combustion chamber 12. In one embodiment, at least a part of the pipe section of the gas injection pipe 4 close to the injection port 41 can be arranged in the combustion chamber 12 and located on the side of the combustion chamber 12; alternatively, as in this embodiment, the gas injection pipe 4 is arranged around the outer peripheral side of the housing 1; the injection port 41 of the gas injection pipe 4 is arranged in the combustion chamber 12 after passing through the housing 1. In this way, the main part of the gas injection pipe 4 is arranged outside the housing 1, without occupying the space in the combustion chamber 12, providing enough circulation area for the flue gas in the combustion chamber 12; the main part of the gas injection pipe 4 generally forms a gas distribution chamber for evenly distributing gas, so that the gas velocity and flow rate ejected from each injection port 41 are balanced and stable.

[0074] Please refer to Figure 1 、 Figure 3 and Figure 4 , in one embodiment, the combustion chamber 12 includes a first combustion chamber (not marked in the drawing) and a second combustion chamber (not marked in the drawing) that are connected in sequence; the first combustion chamber is respectively connected to the air outlet of the mixed gas distribution chamber 31 and the air outlet of the air intake chamber 11; the second combustion chamber is connected to the injection port � of the gas injection pipe 4. The first combustion chamber allows the mixed gas discharged from the mixed gas distribution chamber 31 to burn sufficiently to generate enough temperature to preheat the air discharged from the air intake chamber 11 to a preset target temperature; the second combustion chamber allows the gas ejected from the gas injection pipe 4 to perform high-speed jet flow, so that high-temperature air combustion is formed in the second combustion chamber.

[0075] The part of the housing 1 that constitutes the first combustion chamber and the second combustion chamber can be integrally formed or separately provided. In one embodiment, the housing 1 includes a first housing 121 that forms the first combustion chamber and a second housing 122 that forms the second combustion chamber; the first housing 121 and the second housing 122 are detachably connected. The connection method between the first housing 121 and the second housing 122 can be snap fixation, screw fixation, adhesive fixation or adsorption fixation, etc.; a sealing structure can be arranged at the connection between the first housing 121 and the second housing 122 to ensure their sealed connection and avoid gas leakage in the combustion chamber 12; the detachable connection between the first housing 121 and the second housing 122 facilitates the disassembly and replacement of the two, and is more conducive to the maintenance of the burner.

[0076] In addition, the present invention also provides a gas water heater, which includes a heat exchanger 53 and the burner as described above. Of course, the gas water heater further includes a main body. A heat exchange chamber 51 and a smoke exhaust port 52 communicating with the heat exchanger 53 are provided inside the main body. The heat exchanger 53 is disposed in the heat exchange chamber 51, and the flue gas outlet 13 of the burner communicates with the heat exchange chamber 51. The heat exchanger 53 is connected to an external water source, such as tap water. The high-temperature flue gas entering the heat exchange chamber 51 through the flue gas outlet 13 of the burner carries sufficient heat to continuously exchange heat with the water in the heat exchanger 53, so that the temperature of the water rises to the required value, and hot water is obtained.

[0077] In order to enhance the heat exchange effect of the flue gas on the heat exchanger 53, in one embodiment, the heat exchanger 53 includes heat exchange tubes, and the heat exchange tubes are stacked and wound in the heat exchange chamber 51 along the flue gas flow direction. The flue gas flow direction is also the direction from the flue gas outlet 13 to the smoke exhaust port 52. It can be understood that the heat exchange tubes are arranged in the flue gas flow direction of the high-temperature flue gas, so that the high-temperature flue gas can fully contact the heat exchange tubes during the flowing process to achieve the heat exchange purpose; the stacked winding of the heat exchange tubes helps to expand the contact area between the tap water in the heat exchange tubes and the high-temperature flue gas, thereby optimizing the heat exchange effect.

[0078] It should be noted that the detailed structure of the burner in the gas water heater can refer to the embodiments of the burner described above, and will not be elaborated here; since the above burner is used in the gas water heater of the present invention, therefore, the embodiments of the gas water heater of the present invention include all the technical solutions of all the embodiments of the above burner, and the achieved technical effects are also exactly the same, and will not be elaborated here.

Claims

1. A burner, characterized in that, Comprising: A housing, forming an air intake chamber and a combustion chamber that are sequentially connected; A premixer, configured to access fuel gas and air, premix them, and supply the mixed gas to the combustion chamber; A preheating burner, configured to ignite the mixed gas in the combustion chamber and heat the temperature in the combustion chamber to a preset temperature; And, A fuel gas injection pipe, having an injection port provided at a side portion of the combustion chamber, the fuel gas injection pipe being configured to inject fuel gas into the combustion chamber so that a high-temperature air combustion reaction occurs in the combustion chamber; Wherein, the combustion chamber has a flue gas outlet, and the fuel gas injection pipe has a channel section connecting the injection port; the channel section is inclined in a direction gradually away from the flue gas outlet in a direction approaching the injection port.

2. The burner according to claim 1, wherein, A plurality of the injection ports are circumferentially spaced apart along the combustion chamber.

3. The burner according to claim 1, characterized in that, The fuel gas injection pipe is arranged such that the fuel gas ejected through the injection port forms a vortex in the combustion chamber.

4. The burner according to any one of claims 1 to 3, characterized in that The fuel gas injection pipe is annularly arranged on the outer peripheral side portion of the housing; The injection port of the fuel gas injection pipe is arranged in the combustion chamber after passing through the housing.

5. The burner according to claim 1, characterized in that, The air intake chamber has an air supply port provided at a side portion of the combustion chamber, and a plurality of the air supply ports are circumferentially spaced apart along the combustion chamber.

6. The burner according to claim 5, characterized in that, The burner further includes an air duct housing, the air duct housing is annularly arranged on the outer peripheral side portion of the housing to jointly enclose the air intake chamber with the housing at the location.

7. The burner according to claim 1, characterized in that, The preheating burner has a mixed gas distribution chamber, an air inlet of the mixed gas distribution chamber is communicated with the premixer, and an air outlet of the mixed gas distribution chamber is communicated with the combustion chamber.

8. The burner according to claim 7, characterized in that, The preheating burner includes a housing forming the mixed gas distribution chamber, a combustion assembly provided at the air outlet of the mixed gas distribution chamber, and an ignition device provided in the combustion chamber and configured to ignite the combustion assembly.

9. The burner according to claim 8, characterized in that, The air intake chamber has an air supply port provided at a side portion of the combustion chamber, and the air supply port is arranged close to the combustion assembly.

10. The burner according to claim 7, characterized in that, The air inlet of the mixed gas distribution chamber is flared in a direction towards the air outlet of the mixed gas distribution chamber.

11. The burner according to claim 7, characterized in that, The combustion chamber includes a first combustion chamber and a second combustion chamber that are sequentially connected; The first combustion chamber is respectively communicated with the air outlet of the mixed gas distribution chamber and the air outlet of the air intake chamber; The second combustion chamber is communicated with the injection port of the fuel gas injection pipe.

12. The burner according to claim 11, characterized in that, The housing includes a first housing forming the first combustion chamber and a second housing forming the second combustion chamber; The first housing and the second housing are detachably connected.

13. The burner according to claim 1, characterized in that, The burner further includes a flame sensing device, the flame sensing device is provided in the combustion chamber and close to the preheating burner, and the flame sensing device is configured to detect whether the preheating burner is in a combustion state, and when it is detected that the preheating burner is not in a combustion state, control the preheating burner to re-ignite.

14. The burner according to claim 1, characterized in that, The burner further includes a temperature measuring device, the temperature measuring device is provided in the combustion chamber, and the temperature measuring device is configured to detect whether the temperature in the combustion chamber reaches a preset target temperature.

15. The burner according to claim 7, characterized in that, The pre-mixer includes a casing, a blower, and a gas on-off valve. The casing is formed with an air inlet duct, a gas flow channel, and a mixing channel. The mixing channel is respectively communicated with the air inlet duct and the gas flow channel. The blower is arranged in the air inlet duct, and the gas on-off valve is arranged in the gas flow channel. The mixing channel is communicated with the air inlet of the mixed gas distribution chamber.

16. The burner according to claim 1, characterized in that, The preheating burner is a fully premixed burner.

17. A gas water heater, characterized in that, It includes a heat exchanger and the burner according to any one of claims 1-16. The heat exchanger produces hot water by the heat generated by the burner.

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