An ultra-low-nitrogen gas burner with premixing function

Abstract

The application discloses a kind of ultra-low nitrogen gas burners with premixing function in the technical field of combustor, comprising: shell and with shell communication cylinder, air inlet pipe, the cylinder is equipped with ignition device, the shell is rotatably equipped with rotating rod and drive assembly, the side wall of rotating rod is equipped with several partitions, several The partition is used to divide the inner cavity of shell into several premixing chambers, the premixing chamber is equipped with turnover assembly;Several The premixing chamber sequentially passes through air inlet pipe and receives the input gas and air, under the action of turnover assembly, after mixing gas and air, mixed gas is input into cylinder;The inner cavity of rotating cylinder is divided into several mutually isolated premixing chambers by several partitions, and several premixing chambers sequentially receive quantitative gas and air and then mix, ensure that the mixing ratio of gas and air is accurate and will not produce error, make combustion sufficient, effectively reduce the NOx content in combustion product.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of burners, in particular to an ultra-low nitrogen gas burner with premixing function. BACKGROUND

[0002] In the field of gas combustion technology, with the increasingly stringent environmental protection requirements, how to effectively reduce the emission of nitrogen oxides (NOx) generated during combustion has become the focus of the industry; in recent years, premixing combustion technology has gradually attracted attention because it can significantly improve combustion efficiency and reduce nitrogen oxides emissions; premixing combustion technology forms a combustible gas mixture by fully mixing gas and air before combustion, thereby achieving more uniform and more complete combustion. This combustion method not only improves thermal efficiency, but also reduces the formation of local high-temperature areas, thereby inhibiting the generation of nitrogen oxides; the existing premixing method generally introduces gas and air into the premixing chamber, and mixes them through a mixing assembly. During the mixing process, gas and air continue to enter, which easily leads to fluctuations in the mixing ratio, especially under dynamic load changes or unstable flow conditions. This instability in the mixing ratio can cause the gas and air ratio to deviate from the optimal value, thereby affecting the combustion effect and resulting in a high NOx content in the combustion products. SUMMARY

[0003] The purpose of the present application is to provide an ultra-low nitrogen gas burner with premixing function to solve the problem of fluctuations in the mixing ratio caused by the continuous entry of gas and air during the mixing process.

[0004] To achieve the above purpose, the present application provides the following technical solution: an ultra-low nitrogen gas burner with premixing function, comprising: a housing, a cylinder body and an air inlet pipe in communication with the housing, a combustion device is arranged in the cylinder body, a rotating shaft and a driving assembly for driving the rotating shaft to rotate are arranged in the housing, a plurality of partitions are arranged on the side wall of the rotating shaft, the plurality of partitions are used to divide the inner cavity of the housing into a plurality of mutually isolated premixing chambers, and a stirring assembly is arranged in each premixing chamber; the plurality of premixing chambers successively pass through the air inlet pipe and receive the input gas and air, and the mixed gas is input into the cylinder body after being mixed by the stirring assembly.

[0005] Preferably, an annular gear is arranged on the housing.

[0006] The stirring assembly comprises a rotating shaft and a blade arranged on the rotating shaft, and a driving gear is arranged on the rotating shaft for engaging with the annular gear.

[0007] Preferably, the shell is provided with a rotating cylinder sleeved on the outer wall of the rotating rod, and a plurality of the partitions are arranged in the rotating cylinder and used for dividing the inner cavity of the rotating cylinder into a plurality of premixing cavities, and a plurality of openings are arranged on the side wall of the rotating cylinder and used for allowing the plurality of premixing cavities to communicate with the air inlet pipe respectively.

[0008] Preferably, a plurality of metal pieces corresponding to the plurality of premixing cavities are arranged on the outer side wall of the rotating cylinder, and the shell is provided with a proximity switch.

[0009] Preferably, the cylinder body comprises a gas storage chamber, a primary combustion chamber and a secondary combustion chamber which are sequentially communicated, the gas storage chamber is communicated with the secondary combustion chamber, and the primary combustion chamber and the secondary combustion chamber are both provided with ignition devices.

[0010] Preferably, the partition comprises a mounting plate and movable plates arranged on both sides of the mounting plate, a plurality of moving grooves are arranged on the side wall of the rotating rod and correspond to and are arranged in the plurality of premixing cavities, and moving blocks sleeved in the moving grooves are arranged on the two movable plates in one of the premixing cavities, and electromagnets for adsorbing the moving blocks are arranged in the moving grooves.

[0011] Preferably, the moving block comprises a sleeve, a movable block sleeved in the sleeve and an elastic piece arranged between the sleeve and the movable block, the sleeve and the movable block can be adsorbed by the electromagnet, and the movable block is connected with the movable plate.

[0012] Preferably, the shell is provided with a buffer box, the shell is provided with an air inlet hole for communicating with the buffer box, the shell is provided with a through hole for communicating with the air inlet pipe, a mounting groove is arranged on the side wall of the through hole, a baffle and a driving device for driving the baffle to move are arranged in the mounting groove, the baffle is provided with a gas guide groove, and the driving device is used for driving the baffle to move after a certain amount of gas and air are accommodated in the premixing cavity, cutting off the through hole and making the air inlet pipe communicate with the buffer box through the gas guide groove.

[0013] Preferably, the driving assembly comprises a piston, a rack, a transmission shaft and a driven gear, the piston is sleeved in the buffer box, the rack is arranged on the piston, the driven gear is arranged on the rotating rod, and the transmission shaft is arranged on the shell and engaged with the rack and the driven gear respectively.

[0014] Preferably, a stop block and a spring piece connected with the stop block are sleeved in the air inlet hole.

[0015] Compared with the prior art, the present application has the following beneficial effects:

[0016] 1. The inner cavity of the rotating cylinder is divided into several mutually isolated premixing cavities by several partitions, and several premixing cavities successively receive a certain amount of gas and air and then mix, so that the mixing ratio of gas and air is accurate and no error is generated, so that the combustion is sufficient, and the content of NOx in the combustion product is effectively reduced;

[0017] 2. When the rotating cylinder rotates with the rotating shaft, the driving gear walks on the ring gear, so that the rotating shaft rotates with the blades, which is used for mixing the gas and air in the premixing cavity, and the power generated by the movement of the rotating cylinder is used for premixing the gas and air;

[0018] 3. When the proximity switch detects a metal part, the metal part corresponds to the energization of the electromagnet in the premixing cavity, which is used to attract the moving block to the electromagnet, so that the two movable plates in a premixing cavity approach each other, reducing the space for storing gas in the premixing cavity, for increasing the pressure of the mixed gas, and ensuring that the mixed gas can normally flow into the next working area BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structure schematic view of the ultra-low nitrogen gas burner of the present application;

[0020] Figure 2 It is a sectional structure schematic view of the ultra-low nitrogen gas burner of the present application;

[0021] Figure 3 It is a connection structure schematic view of the shell and the turning assembly of the present application;

[0022] Figure 4 It is a structure schematic view of the present application Figure 3 It is an enlarged schematic view of the structure at A in the present application;

[0023] Figure 5 It is a connection structure schematic view of the rotating shaft and the partition of the present application;

[0024] Figure 6 It is a partition structure schematic view of the present application;

[0025] Figure 7 It is a structure schematic view of the present application Figure 6 It is an enlarged schematic view of the structure at B in the present application;

[0026] Figure 8 It is a connection structure schematic view of the shell and the buffer box of the present application;

[0027] Figure 9 It is an enlarged schematic view of the structure at C in the present application; Figure 8

[0028] Figure 10 It is a connection structure schematic view of the transmission shaft and the driven gear of the present application;

[0029] ​Figure 11 Figure is a schematic diagram of the connecting structure of the rotating rod and the rotating cylinder of the present application.

[0030] In the figure: 1, housing; 2, cylinder; 201, gas storage chamber; 202, primary combustion chamber; 203, secondary combustion chamber; 3, air inlet pipe; 4, buffer tank; 5, rotating rod; 6, partition plate; 601, mounting plate; 602, movable plate; 7, rotating cylinder; 8, metal piece; 9, proximity switch; 10, turnover assembly; 11, drive gear; 12, ring gear; 13, moving groove; 14, electromagnet; 15, moving block; 151, sleeve; 152, movable block; 153, elastic piece; 16, through hole; 17, baffle; 18, air guide groove; 19, stop block; 20, spring piece; 21, piston; 22, rack; 23, transmission shaft; 24, driven gear; 25, air inlet hole. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0032] Embodiment 1

[0033] Please refer to Figure 1 and Figure 2 A kind of ultra-low nitrogen gas burner with premixing function, including: housing 1, housing 1 is installed with cylinder 2, air inlet pipe 3 in communication, air inlet pipe 3 has two, air and fuel gas are respectively introduced to the inside of housing 1 by two air inlet pipes 3, cylinder 2 includes sequentially communicated gas storage chamber 201, primary combustion chamber 202 and secondary combustion chamber 203, gas storage chamber 201 is communicated with the inner cavity of housing 1, secondary combustion chamber 203 respectively, primary combustion chamber 202 and secondary combustion chamber 203 are each equipped with ignition equipment (such as spark plug);The burner further includes intelligent controller (intelligent controller is used to receive sensor information, and carries out intelligent control to burner, the equipment belongs to prior art, and is not described in detail here).

[0034] It should be noted that the area where the primary combustion chamber 202 communicates with the gas storage chamber 201, the area where the secondary combustion chamber 203 communicates with the primary combustion chamber 202, and the area where the secondary combustion chamber 203 communicates with the gas storage chamber 201 are all provided with nozzles, and each nozzle is provided with an adjusting valve for controlling the opening and closing of the nozzle. The adjusting valve can also be used to accurately control the flow of gas. The adjusting valve is usually used in cooperation with a control system to automatically adjust the amount of gas supply according to the load demand; flow sensors, pressure sensors, and temperature sensors are installed on the burner, such as flow sensors installed in the gas inlet pipe 3, the gas storage chamber 201, etc. The above-mentioned sensors are used to detect the state of the burner and feed back to the intelligent controller, so that the intelligent controller can realize accurate control of the burner. This technology is prior art and will not be described in detail here.

[0035] Please refer to Figure 2 and Figure 11 The inside of the shell 1 is provided with a rotating rod 5, and the shell 1 is provided with a driving assembly for driving the rotating rod 5 to rotate. The inside of the shell 1 is provided with a rotating cylinder 7 which is fixedly sleeved on the outer wall of the rotating rod 5. The outer side wall of the rotating rod 5 is uniformly provided with a plurality of partitions 6 (the plurality of partitions 6 are annularly distributed on the outer side wall of the rotating rod 5). The plurality of partitions 6 are used to divide the inner cavity of the rotating cylinder 7 into a plurality of premixing cavities. The plurality of premixing cavities are separated from each other. A plurality of openings are formed in the outer side wall of the rotating cylinder 7, and the plurality of openings respectively communicate with the plurality of premixing cavities. The inside of the plurality of premixing cavities is respectively provided with a stirring assembly 10.

[0036] Working principle: gas and air enter the inside of the shell 1 through two gas inlet pipes 3 and enter the inner cavity of a premixing chamber. After the gas and air in the premixing chamber reach a predetermined amount, the driving assembly drives the rotating rod 5 to rotate with the rotating cylinder 7, removes the premixing chamber containing the gas and air, and makes the next empty premixing chamber communicate with the gas inlet pipe 3. At the same time, the turning assembly 10 mixes the air and gas in the premixing chamber. Repeat the operation until the premixing chamber containing the mixed gas communicates with the gas storage chamber 201 of the cylinder body 2. At this time, the mixed gas in the premixing chamber enters the inside of the gas storage chamber 201. When the combustion work is carried out, part of the mixed gas in the gas storage chamber 201 is introduced into the inside of the primary combustion chamber 202 and ignited to form a low-temperature flame (the main target of the primary combustion chamber 202 is to reduce the flame temperature, inhibit the generation of NOx, and produce some incomplete combustion products). The combustion products and incomplete combustion fuel produced by the primary combustion chamber 202 enter the secondary combustion chamber 203, and the mixed gas in the gas storage chamber 201 enters the secondary combustion chamber 203 (in order to ensure that the incomplete combustion fuel can be completely combusted, air can also be introduced into the inside of the secondary combustion chamber 203. The flame temperature of the secondary combustion zone is higher, which ensures complete combustion of the fuel and reduces the emission of unburned hydrocarbons and other pollutants). The mixed gas is ignited, and the above operation is repeated to make the burner continue to burn.

[0037] It should be noted that the connection between the primary combustion chamber 202 and the secondary combustion chamber of the burner in the segmented combustion process is seamless, and the combustion process is continuous. The main task of the primary combustion chamber 202 is to form a low-temperature flame to reduce the generation of NOx, and the secondary combustion chamber 203 is responsible for ensuring complete combustion of the fuel. This method belongs to the prior art and will not be described in detail here.

[0038] In this embodiment, as a further optimized scheme, please refer to Figure 2 、 Figure 3 、 Figure 4 、 Figure 11 , the annular gear 12 is fixedly installed on the shell 1, and the axis of the annular gear 12 is the same as the axis of the rotating rod 5. The turning assembly 10 includes a rotating shaft and blades provided on the side wall of the rotating shaft. The rotating shaft is rotatably installed on the rotating cylinder 7, and the end of the rotating shaft penetrates through the rotating cylinder 7. The outer wall of the rotating shaft is sleeved with the driving gear 11, and the driving gear 11 is engaged with the annular gear 12. When the rotating rod 5 rotates with the rotating cylinder 7, the turning assembly 10 moves with the rotating cylinder 7. In this process, the driving gear 11 walks on the annular gear 12, so that the rotating shaft rotates with the blades to mix the gas and air in the premixing chamber. The power generated by the movement of the rotating cylinder 7 is used to premix the gas and air.

[0039] In this embodiment, as a further optimized scheme, please refer toFigure 2 The outer side wall of the rotating cylinder 7 is provided with a plurality of metal pieces 8 (metal capable of being magnetically adsorbed, such as iron) corresponding to a plurality of premixing cavities respectively, and the inner side wall of the shell 1 is provided with a proximity switch 9 (magnetic proximity switch); during the process of driving the rotating rod 5 and the rotating cylinder 7 to rotate by the driving assembly, when the proximity switch 9 detects the metal piece 8, the intelligent controller will control the driving assembly to stop working, so that the rotating cylinder 7 stops rotating, ensuring that the premixing cavity accurately reaches the predetermined position, avoiding misplacement to affect the flow of mixed gas.

[0040] In this embodiment, as a further optimized scheme, please refer to Figure 5 、 Figure 6 and Figure 7 The partition plate 6 includes a mounting plate 601 and movable plates 602 provided on both sides of the mounting plate 601, and the mounting plate 601 is not connected with the movable plates 602. The side wall of the rotating rod 5 is provided with a plurality of moving grooves 13 corresponding to a plurality of premixing cavities respectively, and the moving grooves 13 are inside the premixing cavities. The movable plates 602 are provided with moving blocks 15, and the moving blocks 15 of two movable plates 602 located in one premixing cavity are slidingly installed in the inner cavity of the moving groove 13 of the premixing cavity. The inner cavity of the moving groove 13 is provided with electromagnets 14, and the electromagnets 14 are between the two moving blocks 15; when the proximity switch 9 detects one metal piece 8, the intelligent controller controls the driving assembly to stop working, and also controls the electromagnets 14 inside the premixing cavity corresponding to the metal piece to work by being electrified, for attracting the moving blocks 15 to move close to the electromagnets 14, so that the two movable plates 602 inside one premixing cavity move close to each other, reducing the space for storing gas inside the premixing cavity, for increasing the pressure of the mixed gas, ensuring that the mixed gas can normally flow into the next working area.

[0041] It should be noted that springs are installed between the moving blocks 15 and the moving grooves 13, so that the moving blocks 15 can be reset when the magnetic force acting on the moving blocks 15 disappears; when the driving assembly drives the rotating cylinder 7 to rotate, the electromagnets 14 will be controlled to be de-energized by the intelligent controller.

[0042] In this embodiment, as a further optimized scheme, please refer to Figure 7The moving block 15 comprises a sleeve 151, a movable block 152 slidingly arranged in the sleeve 151, and an elastic member 153 (spring) arranged between the sleeve 151 and the movable block 152, the sleeve 151 and the movable block 152 can be attracted by the electromagnet 14 (the sleeve 151 and the movable block 152 are made of metal material capable of being magnetically attracted, such as iron), the sleeve 151 is slidingly arranged in the inner cavity of the moving groove 13, and the movable block 152 is connected with the movable plate 602; when the electromagnet 14 is powered to generate a magnetic force, the sleeve 151 will be first attracted and moved by the electromagnet 14, along with the movement of the sleeve 151, the distance between the movable block 152 and the electromagnet 14 is reduced, at this time the electromagnet 14 can attract the movable block 152 to move towards the electromagnet 14, so as to increase the moving range of the movable plate 602, and further increase the pressure of the mixed gas in the premixing cavity.

[0043] Embodiment 2

[0044] As a further optimized solution of Embodiment 1, please refer to Figure 1 、 Figure 2 、 Figure 8 and Figure 9 The outer side wall of the shell 1 is provided with a buffer tank 4, the shell 1 is provided with an air inlet hole 25, the buffer tank 4 is communicated with the premixing cavity through the air inlet hole 25, the shell 1 is provided with a through hole 16, the air inlet pipe 3 is communicated with the premixing cavity through the through hole 16; the inner side wall of the through hole 16 is provided with a mounting groove, the mounting groove is slidingly provided with a baffle 17, the mounting groove is internally provided with a driving device (such as an electric telescopic rod), the moving end of the driving device is connected with the baffle 17, and the baffle 17 is provided with a gas guide groove 18; after a certain amount of gas and air are stored in the premixing cavity, the intelligent controller controls the driving device to work, so that the baffle 17 is moved and inserted into the through hole 16 and the air inlet hole 25, so as to cut off the through hole 16, and make the gas guide groove 18 communicated with the air inlet hole 25, so that the gas and air continuously introduced into the air inlet pipe 3 are temporarily stored in the buffer tank 4, so as to ensure the continuous work; after the rotating rod 5 stops rotating and the empty premixing cavity reaches the predetermined position, the intelligent controller controls the driving device to work, so that the baffle 17 is moved and reset, at this time the gas and air in the air inlet hole 25 directly enter the inside of the empty premixing cavity through the through hole 16, and the air and gas in the buffer tank 4 enter the inside of the premixing cavity through the air inlet hole 25.

[0045] In this embodiment, as a further optimized solution, please refer to Figure 9The inner side wall of the air inlet hole 25 is provided with a receiving groove, a stopper 19 is slidably arranged in the inner cavity of the receiving groove, and a spring member 20 is arranged between the receiving groove and the stopper 19; the spring member 20 pushes the stopper 19 to move, so that the stopper 19 is inserted into the air inlet hole 25, the air inlet hole 25 is cut off, the buffer box 4 is not communicated with the premixing cavity, the gas in the premixing cavity is prevented from entering the buffer box 4, and the gas amount in the premixing cavity is prevented from being reduced; when the baffle 17 moves to cut off the through hole 16, the baffle 17 is also inserted into the air inlet hole 25, the air guide groove 18 is communicated with the air inlet hole 25, and the stopper 19 is completely pushed into the inner cavity of the receiving groove; when the driving device starts to reset the baffle 17, the stopper 19 is also reset under the action of the spring member 20; when the baffle 17 is not completely moved out of the air inlet hole 25, the air inlet hole 25 is opened at this time, and the air and the gas in the buffer box 4 enter the premixing cavity through the air inlet hole 25.

[0046] It should be noted that the stopper 19 is composed of two blocks, the cross-sectional area of the block facing the baffle 17 is smaller than that of the block away from the baffle 17; the block facing the baffle 17 cannot cut off the air inlet hole 25 when inserted into the air inlet hole 25, and the block away from the baffle 17 can cut off the air inlet hole 25 when inserted into the air inlet hole 25, so that the gas and the air in the buffer box 4 can be discharged into the premixing cavity.

[0047] In this embodiment, as a further optimized scheme, please refer to Figure 9 and Figure 10 The driving assembly includes a piston 21, a rack 22, a transmission shaft 23 and a driven gear 24, the piston 21 is slidably arranged in the inner cavity of the buffer box 4 (the piston 21 and the buffer box 4 are sealed, and a spring is arranged between the piston 21 and the buffer box 4, which is used to push the piston 21 to reset and discharge the gas in the buffer box 4), the rack 22 is arranged on the piston 21, the driven gear 24 is fixedly sleeved on the outer wall of the rotating rod 5, the transmission shaft 23 is rotatably arranged on the shell 1, gears are arranged at both ends of the transmission shaft 23, and the two gears are respectively engaged with the rack 22 and the driven gear 24; when the gas and the air enter the buffer box 4, the air pressure in the buffer box 4 increases, which is used to push the piston 21 and the rack 22 to move, so as to drive the transmission shaft 23 to rotate with the rotating rod 5, so that the power of the air inlet is used to drive the rotating cylinder 7 to rotate, and the position of the premixing cavity is adjusted.

[0048] It needs to be explained that the gear on the transmission shaft 23 engaged with the driven gear 24 is a bevel gear, the bevel gear is rotatably sleeved on the outer wall of the transmission shaft 23, and a ratchet mechanism is installed between the transmission shaft 23 and the bevel gear; when the gas and air enter the buffer tank 4, the piston 21 moves, and when the transmission shaft 23 rotates, the bevel gear will rotate with the transmission shaft 23 due to the setting of the ratchet mechanism, which is used to drive the rotating rod 5 to rotate; when the piston 21 moves reversely to reset, the gas and air in the buffer tank 4 are discharged, and due to the setting of the ratchet mechanism, the transmission shaft 23 will not rotate with the bevel gear, which ensures that the premixing cavity will not move reversely.

[0049] It also needs to be explained that the driving assembly can also drive the motor.

[0050] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. An ultra-low nitrogen gas burner with a premixing function, comprising: The shell (1) and the cylinder (2) and the air inlet pipe (3) in communication with the shell (1), the cylinder (2) is provided with a combustion device, characterized in that: the shell (1) is rotatably provided with a rotating rod (5) and a driving assembly for driving the rotating rod (5) to rotate, the side wall of the rotating rod (5) is provided with a plurality of partitions (6), a plurality of partitions (6) are used to divide the inner cavity of the shell (1) into a plurality of mutually isolated premixing cavities, the premixing cavities are provided with a turnover assembly (10); a plurality of premixing cavities pass through the air inlet pipe (3) in turn and receive the input gas and air, under the action of the turnover assembly (10), the gas and air are mixed, and the mixed gas is input into the cylinder (2); The partition (6) comprises a mounting plate (601) and a movable plate (602) arranged on both sides of the mounting plate (601), the side wall of the rotating rod (5) is provided with a plurality of moving grooves (13), a plurality of moving grooves (13) correspond to a plurality of premixing cavities one by one and are arranged in the premixing cavities, two movable plates (602) arranged in one of the premixing cavities are provided with a moving block (15) arranged in the moving groove (13) for sliding, and the moving groove (13) is provided with an electromagnet (14) for adsorbing the moving block (15); The moving block (15) comprises a sleeve (151), a movable block (152) slidingly arranged in the sleeve (151), and an elastic member (153) arranged between the sleeve (151) and the movable block (152), the sleeve (151) and the movable block (152) can be adsorbed by the electromagnet (14), and the movable block (152) is connected with the movable plate (602).

2. The ultra-low nitrogen gas burner with premixing function according to claim 1, characterized in that: The shell (1) is provided with a ring gear (12); The turnover assembly (10) comprises a rotating shaft and a blade arranged on the rotating shaft, and the rotating shaft is provided with a driving gear (11) for engaging with the ring gear (12).

3. The ultra-low nitrogen gas burner with premixing function according to claim 1, characterized in that: The shell (1) is provided with a rotating cylinder (7) for sleeving on the outer wall of the rotating rod (5), a plurality of partitions (6) are arranged in the rotating cylinder (7) and are used to divide the inner cavity of the rotating cylinder (7) into a plurality of premixing cavities, and a plurality of openings are arranged on the side wall of the rotating cylinder (7), and a plurality of openings are used to communicate a plurality of premixing cavities with the air inlet pipe (3) respectively.

4. The ultra-low nitrogen gas burner with premixing function according to claim 3, characterized in that: The outer side wall of the rotating cylinder (7) is provided with a plurality of metal pieces (8) corresponding to a plurality of premixing cavities respectively, and the shell (1) is provided with a proximity switch (9).

5. The ultra-low nitrogen gas burner with premixing function according to claim 1, characterized in that: The cylinder (2) comprises a gas storage chamber (201), a primary combustion chamber (202) and a secondary combustion chamber (203) in sequence, the gas storage chamber (201) and the secondary combustion chamber (203) are in communication, and the primary combustion chamber (202) and the secondary combustion chamber (203) are provided with a combustion device.

6. The ultra-low nitrogen gas burner with premixing function according to claim 4, characterized in that: The shell (1) is provided with a buffer box (4), the shell (1) is provided with an air inlet hole (25) for communicating with the buffer box (4), the shell (1) is provided with a through hole (16) for communicating with the air inlet pipe (3), the side wall of the through hole (16) is provided with a mounting groove, the mounting groove is provided with a baffle (17) and a driving device for driving the baffle (17) to move, the baffle (17) is provided with a gas guide groove (18), the driving device is used for driving the baffle (17) to move after a certain amount of gas and air are received in the premixing cavity, cutting off the through hole (16), and making the air inlet pipe (3) and the buffer box (4) communicate through the gas guide groove (18).

7. The ultra-low nitrogen gas burner with premixing function according to claim 6, characterized in that: The driving assembly comprises a piston (21), a rack (22), a transmission shaft (23) and a driven gear (24), the piston (21) is slidingly arranged in the buffer box (4), the rack (22) is arranged on the piston (21), the driven gear (24) is arranged on the rotating rod (5), and the transmission shaft (23) is arranged on the shell (1) and is engaged with the rack (22) and the driven gear (24) respectively.

8. The ultra-low nitrogen gas burner with premixing function according to claim 6, characterized in that: The air inlet hole (25) is slidingly provided with a stop block (19) and a spring member (20) connected with the stop block (19).

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