Combustion cylinder and full premixing combustor thereof

Abstract

The combustion cylinder comprises a cylinder body, first main fire holes, second main fire holes, fire stabilizing holes and anti-backfire holes, a first combustion area is formed by the first main fire holes, a second combustion area is formed by the second main fire holes and the anti-backfire holes in an up-and-down alternate arrangement mode, and the second combustion area is formed by the second main fire holes and the anti-backfire holes in an up-and-down alternate arrangement mode. The fire stabilizing holes form a third combustion area and a fourth combustion area, the third combustion area is arranged between the first combustion area and the second combustion area, the fourth combustion area is arranged between the two adjacent first combustion areas, and the combustion area of the third combustion area is smaller than that of the fourth combustion area. The combustion cylinder is provided with the third combustion area and the fourth combustion area which are composed of the fire stabilizing holes, the third combustion area serves as an ignition area, and the fourth combustion area serves as a flame induction area, so that the success rate of ignition and the stability and the combustion efficiency of flame combustion can be effectively improved, the service life of the combustor is longer, and the cost is lower.

Description

TECHNICAL FIELD

[0001] The utility model relates to burner technical field, concretely relates to a combustion cylinder and full premix burner thereof. BACKGROUND

[0002] Full premix burner, namely, before the combustion of the gas, the gas and air are premixed in proportion, wherein the combustion cylinder is a structure of the full premix burner. The full premix burner is not limited by mixing time and mixing space, has the advantages of fast combustion speed, instantaneous combustion of mixed gas after leaving the burner fire hole, full combustion, less nitrogen oxide emission and low noise, and is more and more used, especially on the condensing water heater and condensing heating stove.

[0003] The operation principle of the gas heating water heater (full premix condensing stove) is as follows: the gas enters the premixing cavity through the gas control proportional valve, and the air enters the premixing cavity inside the stove through the balanced chimney outer shaft. The gas and air are mixed in the premixing cavity and then enter the fan, the fan sends the mixed gas of the gas and air to the burner by rotating, the mixed gas is ignited by the discharge of the ignition needle, the flame around the burner produces, the flame detection needle checks the ion signal produced by the flame, when the flame detection needle fails to detect the flame signal, the main control board is fed back, and the stove is closed, therefore, the flame stability of the ignition area and the flame detection area of the burner directly determines the combustion stability of the stove. Especially the full premix combustion mode, in the small fire state, the flame burning height is low and the combustion speed is slow, and the backfire or fireout phenomenon is prone to occur.

[0004] In the prior art, the stable flame hole, the main flame hole and the anti-backfire hole are arranged, and the ignition area and the flame detection area are formed by the three kinds of combustion holes, but when the flame detection needle crosses the flame detection area formed by the stable flame hole, the main flame hole and the anti-backfire hole, the flame detection needle fails to detect the flame signal due to the instability of the main flame hole in the small fire state when the large fire is turned into the small fire, so that the stove fails and the normal operation of the stove is affected. UTILITY MODEL CONTENTS

[0005] In order to overcome the defects of the prior art, one of the purposes of the utility model is to provide a combustion cylinder, which solves the above-mentioned traditional problems.

[0006] The second purpose of the utility model is to provide a full premix burner using the combustion cylinder.

[0007] One of the purposes of the utility model is achieved by the following technical scheme:

[0008] A combustion cylinder comprises a cylinder body, a plurality of first main fire holes, second main fire holes, stable fire holes and anti-backfire holes arranged on the cylinder body, each of the first main fire holes forms a first combustion area, each of the second main fire holes and each of the anti-backfire holes form a second combustion area in an alternating arrangement from top to bottom, each of the stable fire holes forms a third combustion area and a fourth combustion area, the third combustion area is arranged between the first combustion area and the second combustion area, the fourth combustion area is arranged between two adjacent first combustion areas, and the combustion area of the third combustion area is smaller than that of the fourth combustion area.

[0009] Preferably, the first main fire hole, the second main fire hole and the anti-backfire hole are long holes, and the stable fire hole is a round hole.

[0010] Preferably, the length of the first main fire hole is less than the length of the second main fire hole, the length of the anti-backfire hole is less than the length of the first main fire hole or the second main fire hole, the widths of the first main fire hole, the second main fire hole and the anti-backfire hole are equal, the diameter of the stable fire hole is greater than the width of the first main fire hole, and the diameter of the stable fire hole is less than the length of the anti-backfire hole.

[0011] Preferably, the diameter of the stable fire hole is 0.5-0.9mm, the width of the first main fire hole is 0.35-0.6mm, and the length of the first main fire hole is 4-8mm; the length of the anti-backfire hole is 0.3-0.4 times the length of the first main fire hole.

[0012] Preferably, the third combustion area is composed of three rows of stable fire hole groups.

[0013] Preferably, the combustion area of the fourth combustion area is 3-4 times the combustion area of the third combustion area.

[0014] The second purpose of the utility model is achieved by the following technical scheme:

[0015] A full-premixing burner comprises the above-mentioned combustion cylinder.

[0016] Preferably, the full-premixing burner further comprises a mounting seat and a distribution cylinder mounted on the mounting seat, the mounting seat is provided with an air inlet hole in communication with the distribution cylinder, and the distribution cylinder is provided with a plurality of air distribution holes; the combustion cylinder and the distribution cylinder have a ventilation gap, and the combustion cylinder is in communication with the air distribution holes through the ventilation gap.

[0017] Preferably, the air distribution holes comprise first air distribution holes and second air distribution holes, each of the first air distribution holes is uniformly distributed to form a first air distribution hole group, each of the second air distribution holes is uniformly distributed to form a second air distribution hole group, and the first air distribution hole group and the second air distribution hole group are alternately arranged.

[0018] Preferably, the full premix burner further comprises a sealing disc for sealing the top of the distribution cylinder, the combustion cylinder, the sealing disc comprising a disc body, a first sealing flange and a second sealing flange extending from the disc body, the outer diameter of the first sealing flange being smaller than the outer diameter of the second sealing flange, the first sealing flange and the second sealing flange being bent on the disc body in sequence to form a stepped structure, the disc body being embedded in the distribution cylinder, the outer wall of the first sealing flange abutting against the inner wall of the distribution cylinder, and the outer wall of the second sealing flange abutting against the inner wall of the combustion cylinder.

[0019] Compared with the prior art, the full premix burner has the advantages that:

[0020] 1、The combustion cylinder is provided with the third combustion area and the fourth combustion area composed of stable fire holes, the third combustion area is used as an ignition area, the fourth combustion area is used as a flame sensing area, the success rate of ignition, the stability of flame combustion and the combustion efficiency can be effectively improved, the service life of the burner is longer, and the cost is lower.

[0021] 2、The full premix burner is provided with the distribution cylinder and the combustion cylinder, the premixed combustion gas can be uniformly distributed in the burner, the mixed gas is distributed by the distribution cylinder and then enters the combustion cylinder for combustion, the combustion cylinder is provided with reasonably distributed combustion holes, the problem of stove failure is reduced, and the stove can normally operate. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a schematic view of the three-dimensional structure of the combustion cylinder of the utility model;

[0023] Figure 2 It is Figure 1 the open diagram of the combustion cylinder shown in the figure;

[0024] Figure 3 It is Figure 2 the enlarged view of A shown in the figure;

[0025] Figure 4 It is Figure 2 the enlarged view of B shown in the figure;

[0026] Figure 5 It is Figure 1 the front view structure schematic view of the combustion cylinder installed in a full premix burner shown in the figure;

[0027] Figure 6 It is Figure 5 the exploded view of the full premix burner shown in the figure;

[0028] Figure 7 It is Figure 5 the sectional view of the full premix burner shown in the figure;

[0029] Figure 8 for Figure 6 the open view of the distribution cylinder shown in the figure;

[0030] Figure 9 for Figure 5 the structure schematic view of the full premix burner shown in the figure is installed on a main heat exchanger.

[0031] In the figure: 100, the combustion cylinder; 10, the cylinder body; 20, the first main fire hole; 30, the second main fire hole; 40, the stable fire hole; 50, the anti-backfire hole; 200, the full premix burner; 210, the mounting seat; 220, the distribution cylinder; 230, the sealing disc. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned purposes, features and advantages of the present application more apparent and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, a lot of specific details are set forth in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, therefore the present application is not limited by the specific embodiments disclosed below.

[0033] In the description of the present application, it should be understood that the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0034] In the description of the present application, it should be understood that when an element is considered to be "connected" to another element, it can be directly connected to another element or there can be intermediate elements. In contrast, when the element is referred to as "directly" connected to another element, there is no intermediate element. EMBODIMENT

[0035] Please refer to Figures 1-9 The combustion cylinder 100 of the preferred embodiment of the present application is used to install on a full premix burner 200, cooperate with the structure of the full premix burner 200, realize full premix combustion. Specifically, the combustion cylinder 100 is generally cylindrical, the combustion cylinder 100 includes a cylinder body 10, a plurality of first main fire holes 20, second main fire holes 30, stable fire holes 40 and anti-backfire holes 50 arranged on the cylinder body 10.

[0036] In the longitudinal direction, each first main flame hole 20 forms a first combustion area, each second main flame hole 30 and each anti-backfire hole 50 form a second combustion area in an alternating manner from top to bottom, and each stabilizing flame hole 40 forms a third combustion area and a fourth combustion area, the third combustion area is arranged between the first combustion area and the second combustion area and close to the first combustion area, and the fourth combustion area is arranged between two adjacent first combustion areas, the combustion area of the third combustion area is smaller than that of the fourth combustion area, and the fourth combustion area is used for the sensing area of the flame detection needle (such as b of Figure 2 ) and the ignition area of the ignition needle (such as a of Figure 2 ), which can effectively improve the success rate of ignition, the stability and efficiency of flame combustion, and the service life and cost of the burner.

[0037] In the transverse direction, the stabilizing flame holes 40, the first main flame holes 20, the stabilizing flame holes 40, the second main flame holes 30 or the anti-backfire holes 50 or the first main flame holes 20, the stabilizing flame holes 40 are arranged from left to right, and corresponding combustion areas are formed in sequence.

[0038] In the embodiment, the first main flame hole 20, the second main flame hole 30 and the anti-backfire hole 50 are long holes, the length of the first main flame hole 20 is less than the length of the second main flame hole 30, the length of the anti-backfire hole 50 is less than the length of the first main flame hole 20 or the second main flame hole 30, the width of the first main flame hole 20, the second main flame hole 30 and the anti-backfire hole 50 is equal, the stabilizing flame hole 40 is a circular hole, the diameter of the stabilizing flame hole 40 is greater than the width of the first main flame hole 20 or the second main flame hole 30 or the anti-backfire hole 50, and the diameter of the stabilizing flame hole 40 is less than the length of the anti-backfire hole 50.

[0039] In one embodiment, the diameter of the stabilizing flame hole 40 is 0.5-0.9mm; the width of the first main flame hole 20 is 0.35-0.6mm, and the length is 4-8mm; the length of the anti-backfire hole 50 is 0.3-0.4 times the length of the first main flame hole 20.

[0040] Optionally, in the longitudinal direction, a plurality of stabilizing flame holes 40 form a stabilizing flame hole 40 group, and the third combustion area is composed of three rows of stabilizing flame hole 40 groups. Among them, the combustion area of the fourth combustion area is 3-4 times the combustion area of the third combustion area.

[0041] For example, Figures 2-4As shown, the combustion chamber 100, in its unfolded state, is a rectangular metal plate with a thickness of 0.7-1.5mm, made of stainless steel. Small, evenly arranged circular holes, with diameters between 0.5-0.9mm, are provided on the metal plate in both the X and Y directions. Between the three rows of small circular holes is a row of elongated holes. The elongated holes are arranged in a Y-axis pattern of one large elongated hole and two small elongated holes per group, and are evenly distributed between the three groups of small circular holes in the X-axis direction. The burner is divided into an ignition zone and a flame detection zone by a positioning groove, each with 11 groups of small circular holes. The burner has several holes; the large elongated holes are 0.35-0.6 mm wide and 4-8 mm long; the small elongated holes have the same width as the large elongated holes, but are 0.3-0.4 times the length of the large elongated holes; the small round holes on the combustion cylinder 100 are the burner's flame stabilization holes 40, the large elongated holes are the main flame holes, and the small elongated holes are the backfire prevention holes 50; the diameter of the small round holes is larger than the width of the elongated holes, and the area of ​​the flame stabilization holes 40 is larger than the areas of the main flame holes and the backfire prevention holes 50; the purpose of designing the flame stabilization holes 40 as small round holes is to stabilize flame combustion and prevent backfire from occurring in the burner. Backfire occurs because when the gas velocity in the burner hole is less than the combustion velocity, the flame will retract into the burner hole, causing the gas mixture to burn and heat inside the burner, resulting in incomplete combustion and damage to the burner. Because the premixed burner has a fast combustion rate, an overly large stabilizing orifice 40 can easily lead to backfire. Therefore, setting the stabilizing orifice 40 to a small size can prevent backfire, ensure more complete combustion, and improve combustion efficiency. The area of ​​the small round orifice is designed as the ignition zone and flame detection zone. However, if the stabilizing orifice 40 is too small, it can easily lead to flameout, resulting in unstable combustion and easy flameout. Therefore, to prevent potential localized flameout under full-load high-fire conditions, a row of elongated orifices is set between the three rows of small round orifices. Because the cross-section of the elongated orifice is larger than that of the small round orifices, and the airflow velocity is smaller under high-fire conditions, the main flame orifice can stabilize combustion and prevent flameout. Furthermore, in the two... Two smaller elongated holes, known as anti-backfire holes 50, are also provided between the main and secondary elongated holes. Their purpose is to prevent backfire that might occur in the main elongated holes during low-load operation due to the low airflow velocity. Because the cross-sectional area of ​​the anti-backfire holes 50 (smaller elongated holes) is smaller, their airflow velocity is greater than that of the main elongated holes, maintaining stable combustion under low-fire conditions. The anti-backfire holes 50 are positioned close to the main fire holes between the two sets of main elongated holes, preventing backfire in the main fire holes under low-load conditions. This ensures that the fully premixed burner 200 maintains stable flame operation under various conditions, resulting in more complete combustion, higher combustion efficiency, and resolving the problems of unstable combustion, backfire, and flameout in the fully premixed burner 200.

[0042] Understandably, the lengths of the first main burner hole 20 and the second main burner hole 30 may be equal or unequal, depending on the configuration of the combustion chamber 100. Example

[0043] like Figures 5-9 As shown, this utility model also provides a fully premixed burner 200, which is installed on a main heat exchanger. The main heat exchanger is installed in a fully premixed condensing furnace or hot water furnace to premix air and fuel gas, and then burn them. The heat generated by the combustion heats the system water, raising its temperature, and finally discharges it through the flue.

[0044] Specifically, the main heat exchanger includes a premixing chamber, a fan, a mixed gas delivery channel, a fully premixed burner 200, a stainless steel coil, and a smoke collection chamber arranged sequentially along the airflow direction. The premixing chamber has an air inlet and a gas inlet, drawing air and gas into the premixing chamber for mixing. An ignition needle and a flame detection needle are installed on the main heat exchanger, located on one side of the fully premixed burner 200. The ignition needle ignites the mixed gas, and the flame detection needle detects whether the flame is ignited or extinguished. A flue gas exhaust channel is located between the stainless steel coil and the fully premixed burner 200, allowing the high-temperature flue gas to exchange heat with the stainless steel coil before being centrally discharged into the smoke collection chamber. The working principle of the main heat exchanger is as follows: air and gas are initially mixed in the premixing chamber; the fan delivers the mixed gas to the fully premixed burner 200 for uniform distribution; then, under the action of the ignition needle, the gas is ignited, transferring heat to the cold water in the stainless steel coil; and finally, the heat-exchanged flue gas is collected in the smoke collection chamber before being discharged.

[0045] In this embodiment, the fully premixed burner 200 includes a mounting base 210, a distribution cylinder 220 mounted on the mounting base 210, and a combustion cylinder 100. The combustion cylinder 100 is the combustion cylinder 100 of Embodiment 1 described above.

[0046] Mounting base 210 includes a base body, a first mounting portion and a second mounting portion extending from the base body toward the distribution cylinder 220; the base body is generally disc-shaped, and has an air inlet and fixing holes arranged around the air inlet; the air inlet extends longitudinally through the middle of the first mounting portion and the middle of the second mounting portion, for allowing the mixed gas to flow into the fully premixed burner 200; there are four fixing holes, which are evenly distributed so that the mounting base 210 can be fixed to the mixed gas inlet of the main heat exchanger by screws or bolts. In some embodiments, the base body also has positioning holes for positioning the base body to facilitate its installation.

[0047] One end of the first mounting part is connected to the base body, and the other end of the second mounting part is connected to the second mounting part. The first mounting part is used to install the combustion cylinder 100, and the second mounting part is used to install the distribution cylinder 220. In one embodiment, the outer diameter of the first mounting part is larger than the outer diameter of the second mounting part. The first and second mounting parts are bent sequentially on the base body to form a stepped structure, so that there is a ventilation gap between the distribution cylinder 220 and the combustion cylinder 100. In another embodiment, both the first and second mounting parts are circular and concentric. After the mounting base 210 is fixedly installed on the mixed gas inlet of the main heat exchanger by screws or bolts, the top of the screws or bolts abuts against the combustion cylinder 100 to better fix the combustion cylinder 100. Optionally, after the distribution cylinder 220 and the combustion cylinder 100 are fixedly installed on the mounting base 210, they can be fixed or sealed by welding, such as spot welding or full welding.

[0048] Please refer to the following: Figure 7 and Figure 8 The distribution cylinder 220 is cylindrical and coaxially engages with the outer edge of the second mounting portion of the mounting base 210, and communicates with the air inlet. The distribution cylinder 220 is provided with multiple air distribution holes for uniformly distributing the mixed gas. Specifically, the air distribution holes include multiple first air distribution holes and second air distribution holes. The first air distribution holes are evenly distributed to form a first distribution hole group. The first distribution hole group can be formed by the first air distribution holes being arranged horizontally or vertically. The second air distribution holes are evenly distributed to form a second distribution hole group. The second distribution hole group can be formed by the second air distribution holes being arranged horizontally or vertically. The first air distribution holes and the second air distribution holes are air distribution holes of the same shape or different shapes, such as round holes, elongated holes, elliptical holes, square holes, etc., or a combination of two or more. In this embodiment, the first air distribution holes and the second air distribution holes are both round holes formed by stamping. Optionally, the diameter of the first air distribution hole and the diameter of the second air distribution hole may be the same or different circular holes. In one embodiment, the diameter of the first air distribution hole is 1.2 mm - 2.8 mm, and the diameter of the second air distribution hole is 1.2 mm - 2.8 mm. For example, the diameters of the first and second air distribution holes are, but not limited to, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2.0 mm, 2.2 mm, 2.4 mm, 2.6 mm, and 2.8 mm. In this embodiment, the diameter of the first air distribution hole is smaller than the diameter of the second air distribution hole.

[0049] For example Figure 8As shown, the unfolded state of the distribution cylinder 220 is a rectangular metal plate, such as stainless steel or pure copper, with a plate thickness of 0.7mm-1.5mm. The first and second distribution hole groups are alternately arranged in the horizontal and / or vertical directions. For example, in the vertical direction, the first distribution hole group, the second distribution hole group, the first distribution hole group, and the second distribution hole group are arranged sequentially from top to bottom; in the horizontal direction, the second distribution hole group, the first distribution hole group, the second distribution hole group, and the first distribution hole group are arranged sequentially from left to right, and so on in a cyclical manner. Preferably, the first and second distribution hole groups are alternately arranged in both the horizontal and vertical directions. In one embodiment, the horizontal spacing b1 and the vertical spacing b2 of adjacent first and second air distribution holes are the same or different. In this embodiment, the horizontal spacing b1 and the vertical spacing b2 of the first and second air distribution holes are the same, that is, b1 = The range of b2 and b1 (or b2) is 3mm-8mm, for example, a spacing of 3mm, 4mm, 5mm, 6mm, 7mm, or 8mm. This ensures that the first and second air distribution holes of different diameters are evenly distributed laterally and longitudinally. When the mixed gas enters the burner, the evenly distributed air holes in the distribution cylinder 220 ensure that the airflow velocity field is evenly propagated to the combustion cylinder 100, guaranteeing that the airflow velocity at each point is greater than the combustion velocity under minimum load. This results in more complete combustion of the mixed gas, lower noise, and a more uniform and stable flame distribution. Preferably, the distribution cylinder 220 is made of stainless steel in one piece.

[0050] In other embodiments, the fully premixed burner 200 further includes a sealing disc 230 for sealing the top of the distribution cylinder 220 and the combustion cylinder 100. The sealing disc 230 includes a disc body, a first sealing flange and a second sealing flange extending from the disc body. The outer diameter of the first sealing flange is smaller than the outer diameter of the second sealing flange. The first sealing flange and the second sealing flange are bent sequentially on the disc body to form a stepped structure. The disc body is embedded in the distribution cylinder 220. The outer wall of the first sealing flange abuts against the inner wall of the distribution cylinder 220, and the outer wall of the second sealing flange abuts against the inner wall of the combustion cylinder 100.

[0051] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0052] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A combustion chamber, characterized in that, The device includes a cylinder body and a plurality of first main burner holes, second main burner holes, flame stabilizer holes, and backfire prevention holes disposed on the cylinder body. Each first main burner hole forms a first combustion zone, each second main burner hole and each backfire prevention hole are arranged in an alternating manner to form a second combustion zone, and each flame stabilizer hole forms a third combustion zone and a fourth combustion zone. The third combustion zone is disposed between the first combustion zone and the second combustion zone, and the fourth combustion zone is disposed between two adjacent first combustion zones. The combustion area of ​​the third combustion zone is smaller than the combustion area of ​​the fourth combustion zone.

2. The combustion chamber according to claim 1, characterized in that, The first main ignition hole, the second main ignition hole, and the backfire prevention hole are all elongated holes, while the flame stabilizing hole is a round hole.

3. The combustion chamber according to claim 2, characterized in that, The length of the first main ignition hole is less than or equal to the length of the second main ignition hole, the length of the backfire prevention hole is less than or equal to the length of the first main ignition hole or the second main ignition hole, the widths of the first main ignition hole, the second main ignition hole, and the backfire prevention hole are all equal, the diameter of the flame stabilizing hole is greater than the width of the first main ignition hole, and the diameter of the flame stabilizing hole is less than the length of the backfire prevention hole.

4. The combustion chamber according to claim 3, characterized in that, The diameter of the flame stabilizing hole is 0.5-0.9 mm; the width of the first main flame hole is 0.35-0.6 mm and the length is 4-8 mm; the length of the backfire prevention hole is 0.3-0.4 times the length of the first main flame hole.

5. The combustion chamber according to claim 1, characterized in that, The third combustion zone consists of three rows of flame-stabilizing holes.

6. The combustion chamber according to claim 5, characterized in that, The combustion area of ​​the fourth combustion zone is 3-4 times that of the third combustion zone.

7. A fully premixed burner, characterized in that, Includes the combustion chamber as described in any one of claims 1-6.

8. The fully premixed burner according to claim 7, characterized in that, The fully premixed burner also includes a mounting base and a distribution cylinder mounted on the mounting base. The mounting base is provided with an air inlet that communicates with the distribution cylinder, and the distribution cylinder is provided with multiple air distribution holes. There is a ventilation gap between the combustion cylinder and the distribution cylinder, and the combustion cylinder communicates with the air distribution holes through the ventilation gap.

9. The fully premixed burner according to claim 8, characterized in that, The air distribution holes include a first air distribution hole and a second air distribution hole. The first air distribution holes are evenly distributed to form a first distribution hole group, and the second air distribution holes are evenly distributed to form a second distribution hole group. The first distribution hole group and the second distribution hole group are arranged alternately.

10. The fully premixed burner according to claim 8, characterized in that, The fully premixed burner also includes a sealing disc for sealing the top of the distribution cylinder and the combustion cylinder. The sealing disc includes a disc body, a first sealing flange and a second sealing flange extending from the disc body. The outer diameter of the first sealing flange is smaller than the outer diameter of the second sealing flange. The first sealing flange and the second sealing flange are bent sequentially on the disc body to form a stepped structure. The disc body is embedded in the distribution cylinder. The outer wall of the first sealing flange abuts against the inner wall of the distribution cylinder, and the outer wall of the second sealing flange abuts against the inner wall of the combustion cylinder.

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