Burners and gas water heaters

Abstract

The present invention discloses a burner and a gas water heater, wherein the burner comprises a shell, a preheating burner and a turbulent device; a premixing chamber, an air preheating chamber and a combustion chamber which are connected in sequence are arranged in the shell, the premixing chamber has an air inlet for receiving air and gas, the air preheating chamber has an air outlet for air to flow into it, the combustion chamber has a smoke outlet and a gas outlet, the gas outlet is used to spray gas into the combustion chamber to carry out a high-temperature air combustion reaction, the preheating burner is installed in the air preheating chamber, the preheating burner is used to ignite the mixed gas discharged from the premixing chamber into the air preheating chamber, and heat the temperature in the air preheating chamber to a preset temperature; the turbulent device is rotatably arranged in the premixing chamber to turbulent the gas and air entering the premixing chamber. The burner of the present invention makes the combustion of the mixed gas in the premixing chamber in the preheating burner more complete, so that the emission of CO and NOX in the whole combustion process is greatly reduced.

Description

[0001] This application claims priority to Chinese patent application No. 201910992986.8, filed on October 17, 2019, and entitled “BURNER AND GAS WATER HEATER”, the entire text of which is hereby incorporated by reference. Technical Field

[0002] The 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, 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 of the entire furnace is very uniform during this combustion, and the emissions of pollutants NOx and CO are greatly reduced.

[0004] Although high-temperature air combustion has many advantages as mentioned above, there is currently no professional burner to achieve the above high-temperature air combustion. In the related art, a premixing chamber is defined in the shell so that the gas and air are mixed in the premixing chamber and then sent to the preheating burner for combustion. Therefore, whether the mixed gas in the premixing chamber is mixed evenly determines whether it is completely burned in the preheating burner. Therefore, there is an urgent need for a burner that can achieve high-temperature air combustion and make the preheating burner burn completely.

[0005] The above contents are only used to assist in understanding the technical solution of the invention and do not constitute an admission that the above contents are prior art. Summary of the invention

[0006] The main purpose of the present invention is to provide a burner, aiming to solve one or more of the above-mentioned technical problems.

[0007] To achieve the above-mentioned purpose, the burner proposed in the present invention comprises a housing, a preheating burner and a turbulent device;

[0008] The housing is provided with a premixing chamber, an air preheating chamber and a combustion chamber which are connected in sequence, a high-temperature air combustion reaction is carried out in the combustion chamber, the premixing chamber has an air inlet for receiving air and gas, the air preheating chamber has an air outlet for air to flow into it, the combustion chamber has a smoke outlet and a gas outlet, and the gas outlet is used to inject gas into the combustion chamber;

[0009] A preheating burner is installed in the air preheating chamber, and the preheating burner is used to ignite the mixed gas discharged from the premixing chamber into the air preheating chamber;

[0010] Turbulator: The turbulent device is rotatably disposed in the premixing chamber to turbulent the gas and air entering the premixing chamber.

[0011] In one embodiment, the spoiler device includes a spoiler, a rotating shaft and a bearing sleeved on the rotating shaft, the spoiler is rotatably mounted on the housing through the rotating shaft and the bearing, and the spoiler is located between the air inlet and the preheating burner.

[0012] In one embodiment, the bearing is mounted on the housing, one end of the rotating shaft is connected to the bearing, and the other end is fixedly connected to the spoiler.

[0013] In one embodiment, the air inlet is opened on the peripheral wall surface of the premixing chamber.

[0014] In one embodiment, the spoiler device includes a spoiler and a rotating shaft connected to the spoiler, and the burner further includes a driving device, and the driving device is connected to the rotating shaft to drive the spoiler to rotate.

[0015] In one embodiment, the spoiler comprises a disk-shaped body; or, the spoiler comprises a plurality of blades spaced apart along the circumference of the premixing chamber.

[0016] In one embodiment, the disc-shaped body is arranged to gradually expand toward a side close to the preheating burner.

[0017] In one embodiment, the disc-shaped body includes a plurality of concave portions and a plurality of convex portions spaced apart along its circumference, and a concave portion is connected between two adjacent convex portions.

[0018] In one embodiment, a plurality of spoiler holes are formed on the disc-shaped body, and the plurality of spoiler holes are arranged at intervals along the circumference of the disc-shaped body.

[0019] In one embodiment, the disc-shaped body and the inner wall surface of the shell are spaced apart, and the inner wall surface of the shell is also provided with a retaining ring, the protruding height of the retaining ring is greater than or equal to the distance between the disc-shaped body and the inner wall surface of the shell, and the retaining ring is located downstream of the disc-shaped body in the air outlet direction of the premixing chamber.

[0020] In one embodiment, the shell includes an outer shell and a first cylinder disposed in the outer shell, the combustion chamber is defined in the first cylinder, a gas distribution chamber is defined between the first cylinder and the outer shell, the gas distribution chamber has a gas inlet, and a gas outlet is connected to the gas distribution chamber, and there are multiple gas outlets, which are opened on the peripheral wall surface of the first cylinder and are arranged at intervals along the circumference of the first cylinder.

[0021] In one embodiment, the shell further includes a second cylinder disposed in the outer shell, the air preheating chamber and the premixing chamber are defined in the second cylinder, an air distribution chamber is defined between the second cylinder and the outer shell, the air distribution chamber has an air inlet, the air outlet is connected to the air distribution chamber, there are multiple air outlets, the multiple air outlets are opened on the peripheral wall surface of the second cylinder, and are arranged at intervals along the circumference of the second cylinder.

[0022] In one embodiment, the premixing chamber, the air preheating chamber, and the combustion chamber are arranged in sequence from bottom to top, the gas outlet is provided at the upper end of the first cylinder, and the gas flow direction of the gas outlet is downward or inclined downward.

[0023] The present invention also provides a gas water heater, comprising a main body, a heat exchanger and a burner, wherein the burner comprises a shell, a preheating burner and a turbulent device;

[0024] The shell is provided with a premixing chamber, an air preheating chamber and a combustion chamber which are connected in sequence, the premixing chamber has an air inlet for receiving air and gas, the air preheating chamber has an air outlet connected to the air distribution chamber, the combustion chamber has a smoke outlet and a gas outlet, the gas outlet is connected to the gas distribution chamber, so as to inject gas into the combustion chamber, and make the high-temperature air combustion reaction in the combustion chamber;

[0025] A preheating burner is installed in the air preheating chamber, and the preheating burner is used to ignite the mixed gas discharged from the premixing chamber into the air preheating chamber, and heat the temperature in the air preheating chamber to a preset temperature;

[0026] The flow disturbance device is rotatably arranged in the premixing chamber to disturb the gas and air entering the premixing chamber;

[0027] Wherein, a heat exchange chamber and a smoke exhaust port connected to the heat exchange chamber are arranged in the main body, the heat exchanger is arranged in the heat exchange chamber, and the smoke outlet of the burner is connected to the heat exchange chamber.

[0028] The burner of the present invention is provided with a premixing chamber, an air preheating chamber and a combustion chamber which are connected in sequence in the shell, and a rotatable turbulent device is provided in the premixing chamber, so that the air and gas in the premixing chamber are mixed more evenly, so that the mixed gas in the premixing chamber is burned more fully in the preheating burner, and low CO and NOX emissions are guaranteed during the entire combustion process. The preheating burner ignites and burns the mixed gas to achieve high-temperature preheated air, and then sprays the gas through the gas outlet on the combustion chamber 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 combustion chamber 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 combustion chamber. The present invention realizes a specific and feasible burner with high-temperature air combustion function. Moreover, the structure of this burner frame can miniaturize the components that realize high-temperature air combustion, making it have more application space and value. In addition, it has low noise, complete 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 complete combustion and low pollutant emissions that the burners in existing water heaters do not have. And the injection of gas can be achieved by only opening a gas outlet on the combustion chamber. The structure is simple and easy to implement, and the structure of the entire burner is more compact and smaller. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] 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.

[0030] Figure 1 It is a structural schematic diagram of an embodiment of a burner of the present invention;

[0031] Figure 2 for Figure 1 A schematic diagram of the structure of the burner from a top view;

[0032] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure along the middle line AA;

[0033] Figure 4 for Figure 2 Schematic diagram of the cross-sectional structure along the middle edge BB;

[0034] Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure of the middle edge CC;

[0035] Figure 6 It is a schematic structural diagram of an embodiment of a disc-shaped body of a burner of the present invention.

[0036] Description of Figure Numbers:

[0037]

[0038]

[0039] 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

[0040] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0041] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text is to include three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or a solution that satisfies both A and B.

[0042] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0043] 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.

[0044] 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.

[0045] In the embodiment of the present invention, Figures 1 to 4As shown, the burner 10 includes a housing 100, a preheating burner 200 and a turbulent device 300. The housing 100 is formed with a premixing chamber 130, an air preheating chamber 140 and a combustion chamber 150 which are connected in sequence. The premixing chamber 130 has an air inlet 131 for receiving air and gas, and the air preheating chamber 140 has an air outlet 141 for air to flow into it. The combustion chamber 150 has a smoke outlet 151 and a gas outlet 152, and the gas outlet 152 is used to inject gas into the combustion chamber 150 so that a high-temperature air combustion reaction is carried out in the combustion chamber 150. The preheating burner 200 is installed in the air preheating chamber 140, and the preheating burner 200 is used to ignite the mixed gas discharged from the premixing chamber 130 to the air preheating chamber 140, and heat the temperature in the air preheating chamber 140 to a preset temperature. The turbulence device 300 is rotatably disposed in the premixing chamber 130 to turbulent the gas and air entering the premixing chamber 130 .

[0046] The main characteristics of high-temperature air combustion are: the chemical reaction mainly occurs in a high-temperature, 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, 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 at any position in 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.

[0047] In this embodiment, the cross-sectional shape of the housing 100 can be rectangular, circular, elliptical, or irregular, and can be selected and designed according to actual needs, and no specific limitation is made here. The premixing chamber 130, the air preheating chamber 140, and the combustion chamber 150 can be connected in a straight line arrangement (the wind passage is a straight line), or in a turning line arrangement (the wind passage is a broken line), or in a layered surrounding manner (the air flow is blown out from the inside to the outside or from the outside to the inside). Of course, the premixing chamber 130, the air preheating chamber 140, and the combustion chamber 150 can also be arranged in a straight line and surrounded manner, and the premixing chamber 130, the air preheating chamber 140, and the combustion chamber 150 only need to be connected in sequence, and no specific limitation is made here. The cross-sectional shape of the premixing chamber 130, the air preheating chamber 140, and the combustion chamber 150 can be circular, elliptical, annular, rectangular, etc., and can be selected and designed according to the actual shape of the housing 100 and the arrangement of the three.

[0048] In order to make the combustion more complete, the gas entering from the air inlet 131 is a mixed gas of fuel gas and air mixed by the premixer. The external air first enters the air distribution chamber 110 of the housing 100, and then enters the air preheating chamber 140 from the air outlet 141. The air flow can be blown into the air distribution chamber 110 by a blower or other device, and then enters the air preheating chamber 140 relatively evenly through the air outlet 141. It should be noted that the air outlet 141 is arranged at the outlet end of the preheating burner 200. That is, when the mixed gas in the premixing chamber 130 is burned by the preheating burner 200, the high-temperature flue gas enters the air preheating chamber 140, and at the same time, the air enters the air preheating chamber 140 from the air outlet 141, so that the cold air is mixed with the high-temperature flue gas in the air preheating chamber 140, thereby heating the cold air. The heated air and high-temperature flue gas enter the combustion chamber 150 to heat the combustion chamber 150. In order to fully and evenly mix the air with the high-temperature flue gas generated during combustion in the air preheating chamber 140, there are multiple air outlets 141, and the multiple air outlets 141 are arranged at intervals around the peripheral wall surface of the air preheating chamber 140. The multiple air outlets 141 can comb the air into multiple uniform airflows, so that the air and the high-temperature flue gas burned in the air preheating chamber 140 are mixed more fully and evenly. In order to further stir the cold air and high-temperature flue gas in the air preheating chamber 140, a stirring device can be set in the air preheating chamber 140 to fully stir and mix the cold air and high-temperature flue gas, so that the air is quickly and evenly heated to a preset temperature.

[0049] The gas in the gas distribution chamber 120 can be controlled by an external gas valve. It is understandable that, since the gas valve has a certain gas pressure when it is opened, the gas in the gas distribution chamber 120 can be sprayed from the gas outlet 152 into the combustion chamber 150. The gas outlet 152 can be an opening opened on the wall of the shell 100, or it can be an airflow outlet of a gas nozzle or a gas nozzle, and the gas should be sprayed from the gas outlet 152 of the gas injection device to achieve a high-speed jet. The high-speed injected gas forms a suction effect in the combustion chamber 150, so that a jet burner and a flue gas recirculation zone are formed in the combustion chamber 150, and the high-temperature flue gas in the combustion chamber 150 circulates rapidly and strongly in the combustion chamber 150, and then the injected gas and the incoming air are fully diluted to form a lower oxygen concentration, reduce the combustion reaction speed, and maintain a higher temperature in the combustion chamber 150, keeping the temperature higher than the auto-ignition point of the fuel to achieve auto-ignition. In this way, this embodiment meets the conditions of high-temperature air combustion (MILD combustion): high-temperature preheated air is combined with high-speed jets to achieve the entrainment of high-temperature flue gas and dilute the ignition air jet, so that the oxygen concentration is lower than a certain value and the temperature is higher than the auto-ignition point of the fuel.

[0050] The preheating burner 200 can be specifically a full premixing burner. The preheating burner 200 can be installed in the air preheating chamber 140, or it can be installed at the gas flow port between the premixing chamber 130 and the air preheating chamber 140. The preheating burner 200 is used to ignite the mixed gas discharged from the premixing chamber 130 to the air preheating chamber 140. Specifically, the burner 10 also includes an ignition device arranged in the shell 100 adjacent to the preheating burner 200, and the ignition device is used to ignite the preheating burner 200. In order to ensure uniform combustion, the preheating burner 200 includes a plate-like body and a plurality of air holes arranged in the thickness direction of the plate-like body, and the plurality of air holes are used for the mixed gas to pass through and enter the air preheating chamber 140. The plurality of air holes can be evenly or staggeredly arranged on the plate-like body to ensure uniform combustion. The ignition device can be specifically an electronic igniter or an electric heating wire, so that the power consumption is smaller.

[0051] The spoiler 300 may specifically include structures such as a spoiler, a spoiler disk, a comb-like structure, and spoiler blades. The spoiler 300 may rotate automatically or be driven by a driving device to rotate. The automatic rotation of the spoiler 300 means that the spoiler 300 achieves a small or frictionless contact with the bearing 330 through a rotating shaft, or a rotating shaft, and then when the mixed airflow enters the premixing chamber 130 from the air inlet 131, the mixed airflow drives the spoiler 300 to rotate, cuts and stirs the mixed gas, so that the gas and air are evenly mixed. In one embodiment, the spoiler 300 includes a spoiler and a rotating shaft 320 connected to the spoiler, and the burner 10 also includes a driving device, which is connected to the rotating shaft 320 to drive the spoiler to rotate. The spoiler is fixedly connected to the rotating shaft 320, and the driving device can specifically be a driving member such as a driving motor that can drive the rotating shaft 320 to rotate. The output shaft of the driving motor is connected to the rotating shaft 320, which in turn drives the spoiler to rotate, so as to cut and stir the mixed gas, thereby achieving the purpose of evenly mixing the gas and air. When the mixed gas stirred by the spoiler 300 enters the preheating burner 200 for combustion, the combustion is more complete, the pollutant emission during the combustion process is low, and the noise is low.

[0052] When the burner 10 is working, the mixed gas is transported into the premixing chamber 130 through the air inlet 131, and the turbulence device 300 rotates to make the gas and air evenly mixed. After the preheating burner 200 is ignited by the ignition device, the high-temperature flue gas after the mixed gas is burned enters the air preheating chamber 140. At the same time, the air enters the air preheating chamber 140 from the air distribution chamber 110 through the air outlet 141. The high-temperature flue gas mixes with the cold air to heat the cold air. It can be understood that by controlling the heating temperature, the air in the air preheating chamber 140 can be heated to the target temperature, that is, the preset temperature, so that the high-temperature preheating of the air is achieved. Specifically, the burner 10 also includes a temperature measuring device, which is arranged in the air preheating chamber 140. The temperature measuring device is used to detect whether the gas temperature in the air preheating chamber 140 reaches the target temperature. If not, the temperature in the air preheating chamber 140 needs to be increased. The air intake volume can be controlled, or the ratio of gas and air in the premixing chamber 130 can be controlled to achieve temperature regulation. By detecting the temperature, the preheating burner 200 can automatically adjust the heat load according to the amount of air required for the combustion of MILD to achieve the effect of rapid preheating of the air, while ensuring low CO and NOX emissions during the entire combustion process. The temperature measuring device can be a temperature sensor. After the high-temperature preheated air and high-temperature flue gas are transported to the combustion chamber 150, the gas outlet 152 is controlled to spray gas, the gas contacts the high-temperature gas, and the high-temperature gas ignites the gas to achieve MILD combustion in the combustion chamber 150. The heat after combustion is discharged through the flue gas outlet 151, and then it can be heat exchanged with the heat exchanger of the gas water heater to achieve hot water.

[0053] The burner 10 of the present invention is provided with a premixing chamber 130, an air preheating chamber 140 and a combustion chamber 150 which are connected in sequence in the housing 100, and a rotatable spoiler device 300 is provided in the premixing chamber 130, so that the air and gas in the premixing chamber 130 are mixed more evenly, so that the mixed gas in the premixing chamber 130 is burned more fully in the preheating burner 200, and low CO and NOX emissions are ensured in the whole combustion process. The preheating burner 200 ignites and burns the mixed gas, realizes high-temperature preheating of air, and then sprays the gas through the gas outlet 152 to produce the entrainment effect, so that the high-temperature flue gas refluxes, on the one hand, realizes heat preservation so that the temperature is higher than the auto-ignition point of the fuel, so that the gas in the combustion chamber can self-ignite, and on the other hand, the air is diluted by jet entrainment, so that the oxygen concentration is lower than a certain value, and uniform combustion is achieved, so that high-temperature air combustion occurs in the combustion chamber 150. In other words, the technical solution of this embodiment is conducive to achieving these two conditions at the same time, and smoothly realizing high-temperature air combustion. Moreover, the structure of the burner frame can miniaturize the components for high-temperature air combustion, so that it has more application space and value. In addition, it has low noise, complete 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 complete combustion and low pollutant emissions that the burners in existing water heaters do not have. And only by opening the gas outlet 152 on the combustion chamber 150 can the gas be injected, which has a simple structure and is easy to implement, and makes the structure of the entire burner 10 more compact and smaller.

[0054] In the above embodiment, in order to better obtain a mixed gas of gas and air, the premixer includes a housing, a fan 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 connected with the air inlet duct and the gas flow channel respectively, the fan is arranged in the air inlet duct, the gas switch valve is arranged in the gas flow channel, and the mixing channel is connected with the air inlet 131 of the mixed gas distribution chamber. When mixed gas is needed, the fan is controlled to work and the gas switch valve is controlled to open according to the preset air inlet and gas ratio, so as to obtain a mixed gas with a certain gas / air ratio in the housing.

[0055] In one embodiment, if Figure 3 and Figure 4 As shown, the spoiler device 300 includes a spoiler, a rotating shaft 320 and a bearing 330 sleeved on the rotating shaft 320 . The spoiler is rotatably mounted on the housing 100 through the rotating shaft 320 and the bearing 330 . The spoiler is located between the air inlet 131 and the preheating burner 200 .

[0056] In this embodiment, the spoiler can be a structure that can stir the airflow, such as a spoiler plate, a spoiler disk, a comb-shaped structure, a spoiler blade, etc. The bearing 330 is specifically a rolling bearing 330, so that the friction resistance between the rotating shaft 320 and the bearing 330 is small, and then when the airflow blows the spoiler, the spoiler can be rotated, and the gas and air can be cut and stirred to further mix the gas. The spoiler is located between the air inlet 131 and the preheating burner 200, so that after the airflow enters the premixing chamber 130 from the air inlet 131, it can be directly blown to the spoiler, thereby driving the spoiler to rotate better. The air inlet 131 can be opened on the peripheral wall surface or the bottom wall surface of the premixing chamber 130. By making the spoiler rotatably mounted on the housing 100 through the rotating shaft 320 and the bearing 330, there is no need to set up a driving device to drive the spoiler to rotate. The airflow of the air inlet 131 realizes the automatic rotation of the spoiler, which has a simple and ingenious structure, occupies a small space, and has a good stirring effect. It is understandable that in other embodiments, the bearing 330 can also be replaced by a plurality of circumferentially arranged rolling bodies. In this case, the rolling bodies need to be embedded in the housing 100 or the spoiler, so that the rotating shaft 320 drives the spoiler to rotate relative to the housing 100 or the rolling bodies drive the spoiler to rotate relative to the housing 100. In order to make the airflow entering from the air inlet 131 have a better blowing effect on the spoiler, the air inlet 131 is opened on the peripheral wall surface of the premixing chamber 130. Compared with opening the air inlet 131 at the bottom of the premixing chamber 130, the airflow blows from the side to the spoiler, so that the airflow can exert a large upward force on the spoiler, thereby promoting the spoiler to rotate better. In other embodiments, the spoiler can also be directly rotatably mounted on the housing 100 through the rotating shaft 320.

[0057] Based on the above embodiments, please refer to Figure 3 and Figure 4, the bearing 330 is mounted on the housing 100, one end of the rotating shaft 320 is connected to the bearing 330, and the other end is fixedly connected to the spoiler. The bearing 330 is mounted on the bearing 330 seat of the housing 100. Compared with the solution of mounting the bearing 330 on the spoiler, the weight of the spoiler can be reduced, so that the rotation of the spoiler under the blowing of the airflow is more labor-saving, thereby increasing the rotation speed of the spoiler and improving the airflow mixing effect. Specifically, there are at least two bearings 330, and the two bearings 330 are spaced apart along the extension direction of the rotating shaft 320. It can be understood that if the housing 100 is configured to have a certain thickness, a double-layer or multi-layer wall structure, two or more bearing 330 seats are set on the housing 100. By arranging two or more bearings 330 at intervals along the extension direction of the rotating shaft 320, on the one hand, the rotational connection between the rotating shaft 320 and the shell 100 is made smoother, preventing the rotating shaft 320 from being skewed, which in turn causes the spoiler to rotate unsmoothly, and on the other hand, the working reliability of the spoiler is ensured, so that when one of the bearings 330 fails, the rotating shaft 320 can still rotate freely relative to the shell 100, so that the spoiler can always rotate freely under the blowing of the airflow to cut and stir the airflow.

[0058] In another embodiment, the bearing 330 is mounted on the spoiler, one end of the rotating shaft 320 is fixedly mounted on the housing 100, and the other end is rotatably connected to the spoiler through the bearing 330. In this way, the spoiler rotates relative to the rotating shaft 320 as the bearing 330 rotates, and the spoiler can also rotate freely under the blowing of the airflow, thereby stirring the mixed gas.

[0059] In one embodiment, please refer to Figures 3 to 6 , the spoiler includes a disc-shaped body 310. It is understandable that the disc-shaped body 310 can be a disc-shaped structure such as a circular disc, an elliptical disc, a square disc, etc. When the spoiler includes the disc-shaped body 310, the contact area between the spoiler and the mixed gas entering the air inlet 131 can be increased, so that the force-bearing area of ​​the spoiler is large, and the spoiler can rotate freely and smoothly under the push of the air flow to cut and stir the gas. The cross-sectional area of ​​the disc-shaped body 310 should be smaller than the cross-sectional area of ​​the premixing chamber 130, so that the disc-shaped body 310 can rotate unimpeded in the premixing chamber 130, and the air flow can flow from the gap between the disc-shaped body 310 and the inner wall of the premixing chamber 130 to the air preheating chamber 140.

[0060] In practical applications, a plurality of spoiler holes 313 are provided on the disc 310, and the plurality of spoiler holes 313 are arranged at intervals along the circumference of the disc 310. The shape of the spoiler holes 313 can be circular, rectangular, or irregular. By providing a plurality of spoiler holes 313 on the disc 310, on the one hand, the weight of the disc 310 can be effectively reduced, thereby reducing the airflow pushing resistance. On the other hand, the spoiler holes 313 can increase the path of the mixed gas channel, thereby improving the gas flow rate, and the spoiler holes 313 can divert the mixed gas, further improving the mixing effect of the gas and air. The spoiler holes 313 can be set to multiple circles, and the multiple circles of spoiler holes 313 are arranged at intervals from the middle of the disc 310 to the periphery. In this way, the spoiler holes 313 are evenly distributed on the disc 310, and the overall cutting and stirring airflow effect is better. At this time, the cross-sectional area of ​​the disc-shaped body 310 may be slightly smaller than the cross-sectional area of ​​the premixing chamber 130 , so as to stir and cut the airflow in the premixing chamber 130 as much as possible.

[0061] In order to further improve the mixing effect of the mixed gas, on the basis of the multiple flow disturbance holes 313 provided on the disc-shaped body 310, further, as Figure 3 and Figure 4 As shown, the disc 310 is spaced apart from the inner wall of the housing 100, and a baffle ring 160 is convexly provided on the inner wall of the housing 100, and the convex height of the baffle ring 160 is greater than or equal to the distance between the disc 310 and the inner wall of the housing 100. In the air outlet direction of the premixing chamber 130, the baffle ring 160 is located downstream of the disc 310. When the disc 310 and the inner wall of the housing 100 are spaced apart, the disc 310 can be ensured to rotate smoothly in the premixing chamber 130 without any hindrance. The baffle ring 160 is provided downstream of the disc 310, and the baffle ring 160 is used to block the gap between the disc 310 and the inner wall of the housing 100, so that when the mixed gas passes through the disc 310, the gap resistance can be increased to prevent the mixed gas from escaping from the gap between the disc 310 and the inner wall of the housing 100. As a result, the airflow entering the premixing chamber 130 from the air inlet 131 passes through the disc-shaped body 310 and the spoiler holes 313 of the disc-shaped body 310, which can effectively comb the mixed airflow. The disc-shaped body 310 can also cut and stir the mixed airflow passing through the spoiler holes 313, further improving the mixing effect of the gas and air.

[0062] In other embodiments, the spoiler includes a plurality of blades spaced apart along the circumference of the premixing chamber 130. The number and size of the blades can be selected and designed according to the size of the cross-sectional area of ​​the premixing chamber 130. The blades can be three, four, five, etc. The blades can be spaced apart in the circumferential direction, and two adjacent blades can also be partially overlapped. By making the spoiler include a plurality of blades, the spoiler can also cut and stir the gas when rotating, so that the gas and air are fully mixed.

[0063] Based on the embodiment in which the spoiler includes the disc-shaped body 310, further, please refer to Figure 3 and Figure 4 The disc-shaped body 310 is gradually expanded toward the side close to the preheating burner 200. In this way, the disc-shaped body 310 is roughly trumpet-shaped, and the large end of the disc-shaped body 310 is close to the preheating burner 200, and the small end is close to the air inlet 131. After the mixed airflow enters the premixing chamber 130 from the air inlet 131, it is directly blown to the outer side of the disc-shaped body 310, and expands outward along the wall of the disc-shaped body 310, so as to promote the rotation of the disc-shaped body 310 better, and then the effect of stirring the mixed airflow is better.

[0064] In combination with the embodiment in which the spoiler includes the disc-shaped body 310, further, as Figure 3 , Figure 4 and Figure 6 As shown, the disc-shaped body 310 includes a plurality of recesses 311 and a plurality of protrusions 312 spaced along its circumference, and a recess 311 is connected between two adjacent protrusions 312. In order to further increase the wind receiving area, the disc-shaped body 310 is composed of a plurality of recesses 311 and a plurality of protrusions 312 spaced apart. In this way, the inner wall surface and the outer wall surface of the disc-shaped body 310 are both undulating. By providing the disc-shaped body 310 with a structure in which a plurality of recesses 311 and a plurality of protrusions 312 are spaced apart, the wind receiving area of ​​the disc-shaped body 310 can be increased compared to a disc-shaped body 310 with a flat surface, and the wind receiving direction and wind receiving angle of the disc-shaped body 310 are increased, so that the effect of the mixed gas driving the disc-shaped body 310 to rotate is better. Based on the embodiment in which the disc-shaped body 310 is provided with spoiler holes 313, the spoiler holes 313 are distributed on the concave portion 311 or the convex portion 312. In this way, the disc-shaped body 310 can rotate smoothly under the blowing of the mixed gas while satisfying the circulation of the mixed gas.

[0065] In one embodiment, please refer again to Figure 3 and Figure 4 The shell 100 includes an outer shell 170 and a first cylinder 180 disposed in the outer shell 170. A combustion chamber 150 is defined in the first cylinder 180. A gas distribution chamber 120 is defined between the first cylinder 180 and the outer shell 170. The gas distribution chamber 120 has a gas inlet 121 and a plurality of gas outlets 152. The plurality of gas outlets 152 are opened on the peripheral wall surface of the first cylinder 180 and are arranged at intervals along the circumference of the first cylinder 180.

[0066] In this embodiment, the shape of the shell 170 can be many. In order to maintain the overall consistency and make the overall structure of the burner 10 more compact, the shell 170 can be set in a cylindrical shape as a whole. The gas inlet 121 is connected to a gas inlet pipe, which is connected to the gas source to input the gas. A plurality of gas outlets 152 are provided on the peripheral wall surface of the first cylinder 180, so that the gas can be sprayed from the gas distribution chamber 120 into the combustion chamber 150 through the gas outlets 152, meeting the high-speed jet condition of the gas. And the plurality of gas injection ports make the gas in the combustion chamber 150 more evenly mixed, so that the combustion is slower and more complete. The gas outlet 152 can be provided at the upper end of the first cylinder 180, and the outflow direction corresponding to the gas outlet 152 can be downward, or the gas outlet 152 can be provided at the lower end of the first cylinder 180, and the outflow direction corresponding to the gas outlet 152 can be upward.

[0067] Furthermore, the housing 100 further includes a second barrel 190 disposed in the outer shell 170, and an air preheating chamber 140 and a premixing chamber 130 are defined in the second barrel 190. An air distribution chamber 110 is defined between the second barrel 190 and the outer shell 170. The air distribution chamber 110 has an air inlet 111, and a plurality of air outlets 141 are provided on the peripheral wall surface of the second barrel 190, and are arranged at intervals along the circumference of the second barrel 190. The air inlet 111 is connected to an air intake pipe, which is connected to an air source, and air can be input through a fan or the like. Only by arranging the first barrel 180 and the second barrel 190 in the outer shell 170, the gas distribution chamber 120, the air distribution chamber 110, the air preheating chamber 140, the combustion chamber 150 and the premixing chamber 130 can be defined respectively. The overall structure is simple and the design is ingenious, so that the entire burner 10 has a small volume, occupies a small space, and has a beautiful appearance.

[0068] On the basis of the above embodiments, further, Figure 3 and Figure 4 As shown, the premixing chamber 130, the air preheating chamber 140, and the combustion chamber 150 are arranged in sequence from bottom to top, and the gas outlet 152 is arranged at the upper end of the first cylinder 180, and the airflow direction of the gas outlet 152 is downward or tilted downward. In this way, the air intake direction of the entire burner 10 is from bottom to top, which conforms to the airflow flow characteristics, making the airflow flow smoother. The first cylinder 180 is located above the second cylinder 190, and the outer shell 170 surrounds the first cylinder 180 and the second cylinder 190, maintaining the overall consistency of the appearance, and the layout is more compact and reasonable. The gas outlet 152 is arranged at the upper end of the first cylinder 180, and the airflow of the gas outlet 152 is downward or tilted downward, then the gas is ejected downward from the gas outlet 152, forming a suction effect in the combustion chamber 150, making the gas mixing more uniform, and the combustion slower and more complete.

[0069] Specifically, the upper end of the first cylinder 180 is gradually narrowed from bottom to top. In this way, the upper end of the first cylinder 180 is narrowed from bottom to top. When the gas outlet 152 is arranged at the upper end of the first cylinder 180, the gas outlet 152 is arranged obliquely downward, and the multiple gas outlets 152 arranged at intervals in the circumferential direction all spray gas obliquely downward toward the middle of the air preheating chamber 140, so that the gas in the combustion chamber 150 can be mixed more evenly and the combustion can be slower and more complete.

[0070] The present invention also provides a gas water heater, including a main body, a heat exchanger and a burner 10, wherein a heat exchange chamber and a smoke exhaust port connected to the heat exchange chamber are arranged in the main body, the heat exchanger is arranged in the heat exchange chamber, and the smoke outlet 151 of the burner 10 is connected to the heat exchange chamber. It should be noted that the gas of the gas distribution chamber 120 can be provided through an external gas pipeline, and a gas proportional valve is arranged on the gas pipeline for control, while the air of the air distribution chamber 110 is controlled by an independent fan, which is independent of the fan of the premixer.

[0071] The detailed structure of the burner 10 can refer to the embodiment of the above-mentioned burner 10, which will not be repeated here; it can be understood that since the above-mentioned burner 10 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 10, and the technical effects achieved are also exactly the same, which will not be repeated here.

[0072] In combination with the above-mentioned embodiment of the burner 10, the working principle of the burner 10 of the present invention applied to a gas water heater is described:

[0073] When the water heater is started, the gas switch valve of the premixer and the fan provide the air and gas mixed in a certain proportion to the premixing chamber 130 through the air inlet 131. After being stirred by the turbulence device 300 and fully mixed, they are provided to the preheating burner 200. The ignition device ignites, and combustion begins in the combustion zone of the air preheating chamber 140. The fan corresponding to the air distribution chamber 110 also operates to inhale the air required for combustion. The cold air blown out from the air outlet 141 and the high-temperature flue gas generated by the combustion of the preheating burner 200 are mixed in the air preheating chamber 140 to form high-temperature flue gas. When the temperature measuring device detects that the temperature of the high-temperature flue gas reaches the temperature required for MILD combustion, the gas valve provides gas to the gas distribution chamber 120, and the gas required for MILD combustion is sprayed from the gas outlet 152 to the combustion chamber 150 to combine with the high-temperature gas, and the high-temperature gas ignites the gas to achieve MILD combustion in the combustion chamber 150. Since the gas is sprayed through the gas outlet 152, an entrainment effect is formed in the combustion chamber 150, so that a jet combustion zone and a flue gas recirculation zone are formed in the combustion chamber 150, so that part of the flue gas circulates strongly in the combustion chamber 150, and then the injected gas and air are fully diluted to form a lower oxygen concentration, reduce the combustion reaction speed, and maintain a higher temperature in the combustion chamber 150 to ensure that the temperature is higher than the auto-ignition point of the fuel, so as to achieve auto-ignition. In this way, this embodiment meets the conditions of high-temperature air combustion (MILD combustion): high-temperature preheated air and high-speed jets are used to achieve entrainment of high-temperature flue gas and dilute the ignition air jet, so that the oxygen concentration is lower than a certain value, and the temperature is higher than the auto-ignition point of the fuel. The heat after combustion can be exchanged with the heat exchanger of the gas water heater and then discharged to the outside to produce hot water.

[0074] It can be understood that, since the burner 10 is used in the gas water heater, the gas water heater can effectively reduce the emission of CO and NOx and reduce the noise of the gas water heater.

[0075] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A burner, characterized in that: include: A shell, wherein the shell is provided with a premixing chamber, an air preheating chamber and a combustion chamber which are connected in sequence, the premixing chamber has an air inlet for receiving air and gas, the air preheating chamber has an air outlet for air to flow into it, and the combustion chamber has a smoke outlet and a gas outlet, and the gas outlet is used to inject gas into the combustion chamber so that a high-temperature air combustion reaction is carried out in the combustion chamber; a preheating burner installed in the air preheating chamber, the preheating burner being used to ignite the mixed gas discharged from the premixing chamber into the air preheating chamber and heat the temperature in the air preheating chamber to a preset temperature; as well as A flow disturbance device, the flow disturbance device is rotatably arranged in the premixing chamber to disturb the gas and air entering the premixing chamber; The shell comprises an outer shell and a first cylinder disposed in the outer shell, the combustion chamber is defined in the first cylinder, a gas distribution chamber is defined between the first cylinder and the outer shell, the gas distribution chamber has a gas inlet, the gas outlet is communicated with the gas distribution chamber, and the gas outlet is opened on the peripheral wall surface of the first cylinder; The premixing chamber, the air preheating chamber, and the combustion chamber are arranged in sequence from bottom to top, the gas outlet is arranged at the upper end of the first cylinder, and the gas flow direction of the gas outlet is downward or inclined downward.

2. The burner according to claim 1, characterized in that The spoiler device includes a spoiler, a rotating shaft and a bearing sleeved on the rotating shaft. The spoiler is rotatably mounted on the housing through the rotating shaft and the bearing. The spoiler is located between the air inlet and the preheating burner.

3. The burner according to claim 2, characterized in that The bearing is installed on the housing, one end of the rotating shaft is connected to the bearing, and the other end is fixedly connected to the spoiler.

4. The burner according to claim 1, characterized in that The air inlet is opened on the peripheral wall surface of the premixing chamber.

5. The burner according to claim 1, characterized in that The spoiler device comprises a spoiler and a rotating shaft connected to the spoiler, and the burner further comprises a driving device connected to the rotating shaft to drive the spoiler to rotate.

6. The burner according to claim 2, characterized in that The spoiler comprises a disk-shaped body; or, the spoiler comprises a plurality of blades spaced apart along the circumferential direction of the premixing chamber.

7. The burner according to claim 6, characterized in that The disc-shaped body is arranged to expand gradually toward a side close to the preheating burner.

8. The burner according to claim 6, characterized in that The disc-shaped body comprises a plurality of concave portions and a plurality of convex portions spaced apart along its circumference, and a concave portion is connected between two adjacent convex portions.

9. The burner according to claim 6, characterized in that The disc-shaped body is provided with a plurality of flow-turbulating holes, and the plurality of flow-turbulating holes are arranged at intervals along the circumference of the disc-shaped body.

10. The burner according to claim 6, characterized in that The disc-shaped body is spaced apart from the inner wall surface of the shell, and a baffle ring is protrudingly provided on the inner wall surface of the shell. The protruding height of the baffle ring is greater than or equal to the distance between the disc-shaped body and the inner wall surface of the shell. In the air outlet direction of the premixing chamber, the baffle ring is located downstream of the disc-shaped body.

11. The burner according to claim 1, characterized in that There are multiple gas outlets, and the multiple gas outlets are arranged at intervals along the circumference of the first cylinder.

12. The burner according to claim 11, characterized in that The shell also includes a second cylinder arranged in the outer shell, the air preheating chamber and the premixing chamber are defined in the second cylinder, an air distribution chamber is defined between the second cylinder and the outer shell, the air distribution chamber has an air inlet, the air outlet is connected to the air distribution chamber, there are multiple air outlets, the multiple air outlets are opened on the peripheral wall surface of the second cylinder, and are arranged at intervals along the circumference of the second cylinder.

13. A gas water heater, characterized in that: It comprises a main body, a heat exchanger and a burner as claimed in any one of claims 1 to 12, wherein a heat exchange chamber and a smoke exhaust port connected to the heat exchange chamber are arranged in the main body, the heat exchanger is arranged in the heat exchange chamber, and the smoke outlet of the burner is connected to the heat exchange chamber.

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