A full premix burner and a full premix gas heating water heater

Abstract

The application discloses a full-premix burner and a full-premix gas heating and water heating stove thereof. The full-premix burner comprises a burner channel cover and a combustion cylinder. The burner channel cover is provided with a gas channel, a cooling cavity and a plurality of shunt holes. The gas channel is communicated with the cooling cavity, and each shunt hole is communicated with the cooling cavity. The mixed gas is transported from the gas channel to the cooling cavity to cool the burner channel cover. The preheated mixed gas is shunted through the shunt holes and ignited on the combustion cylinder. The full-premix burner can further reduce the temperature of the burner channel cover by flowing the mixed gas from the gas channel into the cooling cavity, reduce the influence of high-temperature flue gas on the service life of the burner channel cover, reduce the risk of overheating, and improve the combustion speed and combustion stability of the preheated low-temperature gas.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas heating water heaters, in particular to a full premix burner and a full premix gas heating water heater. BACKGROUND

[0002] The full premix burner mixes the gas and air in a certain proportion before the gas is ignited and burned, and the mixed gas is sent into the burner channel under the action of the fan and then into the burner cylinder for ignition and combustion. x The full premix burner has the advantages of fast combustion speed, instantaneous combustion of the mixed gas after leaving the burner hole, complete combustion, low CO and NOx emissions, and low noise, so it is used more and more, especially in condensing water heaters and condensing heating stoves.

[0003] The full premix burner has the advantages of complete combustion, high thermal efficiency, and low CO and NOx emissions compared with conventional atmospheric burners, but the high-temperature flue gas generated by the full premix burner tends to accumulate on the burner channel cover body, which reduces the service life of the burner and the surrounding electrical devices, and the overheating of the burner also increases the risk of damage to the equipment. x

[0004] Most of the burners on the market are insulated by installing a relatively thick insulation board (usually made of aluminum silicate high-temperature fiber board material) to prevent the burner channel cover body from overheating. To some extent, the above traditional technology can solve the problem of high temperature of the burner channel cover body, but it also brings other problems: 1. The aluminum silicate fiber board can insulate most of the heat generated by combustion, reducing the temperature of the burner channel cover body, but as the use time increases, heat will still be transferred through the contact between metals, causing the temperature to rise, and the heat cannot be completely dissipated. 2. The internal environment of the full premix heat exchanger is not only high temperature, but also contains water vapor, which can cause the aluminum silicate fiber board to crack and break, further reducing the insulation effect. 3. The use of insulation boards increases the cost and maintenance cost of the full premix burner itself. SUMMARY

[0005] In order to overcome the shortcomings of the prior art, one of the purposes of the present application is to provide a full premix burner that solves the above-mentioned traditional problems, which has a cooling cavity to cool the burner channel cover body, further reduces the temperature of the burner channel cover body, reduces the impact of high-temperature flue gas on its service life, and reduces the risk of overheating.

[0006] ​The second object of the present application is to provide a full premix gas heating water heater using the full premix burner.

[0007] The first object of the present application is achieved by the following technical solutions:

[0008] The full premix burner comprises a burner channel cover and a combustion cylinder installed on the burner channel cover, the burner channel cover is provided with a gas channel, a cooling cavity and a plurality of shunt holes, the gas channel is in communication with the cooling cavity, and each shunt hole is in communication with the cooling cavity, so that the mixed gas is transported from the gas channel into the cooling cavity to cool the burner channel cover, and the preheated mixed gas is shunted through the shunt holes to ignite and burn on the combustion cylinder.

[0009] Preferably, the burner channel cover comprises a cover main body, a channel pipe and a shunt plate, the cover main body is provided with a first blocking block and a second blocking block, the first blocking block and the second blocking block, the inner wall of the cover main body and the shunt plate form the cooling cavity, the channel pipe is in communication with the cooling cavity, and the shunt holes are arranged on the shunt plate.

[0010] Preferably, the first blocking block has a clamping opening structure, and the clamping opening of the first blocking block is arranged away from the channel pipe; the second blocking block has a Y-shaped structure, and the Y-shaped opening of the second blocking block is arranged in the clamping opening of the first blocking block.

[0011] Preferably, the first blocking block and the second blocking block divide the cover main body into two symmetrically arranged shunt flow channels, the shunt flow channels comprise a first flow channel, a second flow channel, a third flow channel, a fourth flow channel and a fifth flow channel along the gas flow direction, the minimum diameter of the first flow channel is greater than the maximum diameter of the second flow channel, the maximum diameter of the second flow channel is not greater than the minimum diameter of the third flow channel, the minimum diameter of the third flow channel is not less than the maximum diameter of the fourth flow channel, and the maximum diameter of the fourth flow channel is not greater than the minimum diameter of the fifth flow channel.

[0012] Preferably, the shunt plate comprises a plate main body, a mounting portion extending outwardly from the plate main body and an abutting portion, each shunt hole is arranged above the first blocking block and forms a triangular shunt area, the cover main body is provided with a first mounting hole, a clamping groove and an abutting protrusion, the first mounting hole cooperates with the clamping groove to fix the mounting portion, and the abutting protrusion abuts against the abutting portion.

[0013] Preferably, a plurality of heat absorption windows are arranged between the plate main body and the inner wall of the cover main body, and each heat absorption window is arranged in a uniform manner.

[0014] Preferably, the full premix burner further comprises a heat insulation pad and a burner flange plate, the heat insulation pad is used to separate the burner channel cover and the burner flange plate, and the burner flange plate is used to mount the combustion cylinder.

[0015] Preferably, the heat insulation pad comprises an outer ring, an inner ring and a plurality of connecting strips connecting the outer ring and the inner ring, and each connecting strip is arranged in a uniform distribution and forms a plurality of annular holes with the outer ring and the inner ring.

[0016] Preferably, the burner flange plate comprises a disc body and a boss, the disc body is used to compress the shunt plate and the heat insulation pad, and the boss is used to collect mixed gas flowing out of the shunt hole.

[0017] The second object of the present application is achieved by adopting the following technical scheme:

[0018] A full premix gas heating and water heating furnace comprises the full premix burner.

[0019] Compared with the prior art, the present application has the following beneficial effects:

[0020] The full premix burner of the present application is provided with a burner channel cover and a combustion cylinder, the burner channel cover has a gas channel, a cooling cavity and a shunt hole, mixed gas flows into the cooling cavity from the gas channel to cool the burner channel cover, which can further reduce the temperature of the burner channel cover, reduce the influence of high-temperature flue gas on its service life, and reduce the risk of overheating. The preheated mixed gas flows out of the combustion cylinder through the shunt hole. Since the low-temperature gas is preheated, the combustion speed can be improved, and the combustion stability can be enhanced.

[0021] The full premix burner of the present application is provided with a cooling cavity of the burner channel cover, which can cool the burner channel cover without using a heat insulation pad, and also has a good cooling effect, thereby reducing the cost and maintenance cost.

[0022] The full premix burner of the present application is provided with a cooling cavity of the burner channel cover, which cooperates with the heat insulation pad to improve the cooling effect of the cooling cavity on the burner channel cover. The low-temperature mixed gas can absorb the heat generated by the burner while cooling the burner channel cover, thereby preheating the mixed gas. The preheated low-temperature mixed gas can improve the combustion speed and enhance the combustion stability. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 FIG. 2 is a structure diagram of a full premix burner combined with a heat exchanger according to a preferred embodiment of the present application;

[0024] Figure 2 FIG. 1 is a structure diagram of a full premix burner according to a preferred embodiment of the present application; Figure 1 FIG. 2 is an exploded view of the full premix burner shown in FIG. 1.

[0025] Figure 3 for Figure 1 A schematic diagram of the fully premixed burner from another perspective;

[0026] Figure 4 for Figure 3 The exploded view of the fully premixed burner shown;

[0027] Figure 5 for Figure 3 A partial cross-sectional view of the fully premixed burner shown;

[0028] Figure 6 for Figure 3 A top view of the burner passage cover shown;

[0029] Figure 7 for Figure 3 The diagram shows the flow of gas within the burner channel cover.

[0030] In the diagram: 100, fully premixed burner; 10, burner channel cover; 11, cover body; 110, first blocking block; 111, second blocking block; 112, first flow channel; 113, second flow channel; 114, third flow channel; 115, fourth flow channel; 116, fifth flow channel; 117, snap-fit ​​groove; 118, abutment protrusion; 12, channel pipe; 120, circular flange; 20, flow divider; 21 1. Plate body; 210. Diversion hole; 211. Heat absorption window; 22. Mounting part; 23. Abutment part; 30. Heat insulation pad; 31. Outer ring; 32. Inner ring; 33. Connecting strip; 40. Burner flange; 41. Plate body; 42. Boss; 420. Flange outlet; 50. Combustion cylinder; 60. Detection needle; 70. Ignition needle; 80. Sealing ring; 200. Fan; 300. Heat exchanger. Detailed Implementation

[0031] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0032] In the description of the present application, it needs to 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 defined with "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, such as two, three, etc., unless otherwise explicitly specified.

[0033] In the description of the present application, it needs to be understood that when one element is considered to be "connected" to another element, it can be directly connected to another element or there can be an intermediate element. In contrast, when the element is referred to as "directly" connected to another element, there is no intermediate element.

[0034] Please refer to Figures 1-7 The full premix burner 100 of a preferred embodiment of the present application is installed in a full premix gas heating water heater, which also includes a premixer, a fan 200, a water pump, a gas valve and a heat exchanger 300. The combustion part of the full premix burner 100 is installed in the heat exchanger 300. The principle is that the water pump and the fan 200 are started, under the action of the water pump, water circulation is formed, under the action of the fan 200, air is mixed uniformly with the gas adjusted by the gas valve in the premixer, and then input into the full premix burner 100, ignited and burned, and the high-temperature flue gas generated by the combustion heats the system water in the heat exchanger 300.

[0035] Specifically, the full premix burner 100 includes a burner channel cover 10, a flow divider 20 installed on the burner channel cover 10, a heat insulation pad 30, a burner flange plate 40 and a combustion cylinder 50. The burner channel cover 10 is provided with a detection needle 60 and an ignition needle 70, the detection needle 60 is used to detect the combustion condition of the combustion cylinder 50, and the ignition needle 70 is used to ignite the mixed gas on the combustion cylinder 50.

[0036] The burner channel cover 10 is provided with a gas channel, a cooling cavity and a plurality of flow holes 210, the gas channel is in communication with the cooling cavity, and each flow hole 210 is in communication with the cooling cavity, so that the mixed gas is input from the gas channel into the cooling cavity to cool the burner channel cover 10, and the preheated mixed gas is then distributed through the flow holes 210 to ignite and burn on the combustion cylinder 50. That is, the cooling cavity can divide the inner cavity of the burner channel cover 10 into some modules to form a labyrinth cooling structure or other forms of cooling structure, which can increase the residence time of the mixed gas in the burner channel cover 10.

[0037] In this embodiment, as Figure 6The burner passage cover 10 comprises a cover main body 11, a passage pipe 12 and a distribution plate 20. The first blocking block 110 and the second blocking block 111 are arranged in the cover main body 11. The first blocking block 110 and the second blocking block 111, the inner wall of the cover main body 11 and the distribution plate 20 form the cooling cavity. The passage pipe 12 is communicated with the cooling cavity. The distribution hole 210 is arranged on the distribution plate 20. Understandably, the inner cavity of the cover main body 11 is divided by the first blocking block 110 and the second blocking block 111 to form the labyrinth cooling cavity. In one embodiment, the first blocking block 110 is in the form of a clamping opening. The clamping opening of the first blocking block 110 is arranged to face away from the passage pipe 12. The second blocking block 111 is in the form of a Y-shaped structure. The Y-shaped opening of the second blocking block 111 is arranged in the clamping opening of the first blocking block 110. That is, the first blocking block 110 divides the gas inlet of the passage pipe 12 to make the mixed gas flow in two streams in the inner cavity of the cover main body 11. Then, the two streams collide with the inner wall of the cover main body 11 or the second blocking block 111. After that, the two streams enter the Y-shaped cavity of the first blocking block 110 from the bifurcation between the Y-shaped opening of the first blocking block 110 and the second blocking block 111. The two streams meet in the Y-shaped cavity. Finally, the mixed gas flows out of the distribution hole 210.

[0038] Understandably, as Figure 6 The first blocking block 110 and the second blocking block 111 divide the cover main body 11 into two symmetrical distribution flow channels. The distribution flow channels comprise a first flow channel 112, a second flow channel 113, a third flow channel 114, a fourth flow channel 115 and a fifth flow channel 116 along the direction of the gas flow. The minimum diameter of the first flow channel 112 is greater than the maximum diameter of the second flow channel 113. The maximum diameter of the second flow channel 113 is not greater than the minimum diameter of the third flow channel 114. The minimum diameter of the third flow channel 114 is not less than the maximum diameter of the fourth flow channel 115. The maximum diameter of the fourth flow channel 115 is not greater than the minimum diameter of the fifth flow channel 116. Therefore, the mixed gas in the distribution flow channels is narrowed in the second flow channel 113, widened in the third flow channel 114, narrowed in the fourth flow channel 115 and widened in the fifth flow channel 116. The mixed gas in the two distribution flow channels meets or converges in the fifth flow channel 116 and then is outputted outward. Thus, the residence time of the mixed gas in the cover main body 11 is further increased.

[0039] Optionally, one end of the second blocking block 111 is fixed on the inner wall of the cover main body 11 or has a gap with the inner wall of the cover main body 11. The mixed gas collides in the gap and then is distributed or directly flows out of the distribution hole 210. Preferably, one end of the second blocking block 111 is fixed on the inner wall of the cover main body 11.

[0040] As Figures 3-5The cover body 11 is substantially in the shape of a pot cover to increase the cavity volume of the cooling cavity. The cover body 11 is provided with a plurality of lugs for fixed connection with the heat exchanger 300, and the lugs are uniformly distributed. The cover body 11 is further provided with a first annular step having an annular groove, and a sealing ring 80 is installed in the annular groove. The heat exchanger 300 is in sealed connection with the cover body 11 after installation through the action of the sealing ring 80. The cover body 11 is further provided with a second annular step, and the second annular step is provided with a plurality of first installation holes and a clamping groove 117. The first installation holes cooperate with the clamping groove 117 to fix the flow distribution plate 20. In another embodiment, the second annular step is further provided with an abutting protrusion 118 located at the inlet of the passage pipe 12. The abutting protrusion 118 is used to abut against the flow distribution plate 20 to make the flow distribution plate 20 more stable. The abutting protrusion 118 has a protruding part located in the inlet of the passage pipe 12, and the height of the protruding part is 1 / 4-1 / 3 of the inner diameter of the inlet of the passage pipe 12.

[0041] Optionally, the cover body 11 is further provided with symmetrically arranged installation blocks located on the second flow channel 113. The installation blocks are provided with second installation holes for fixing the flow distribution plate 20 and long waist holes for installing detection needles 60 or ignition needles 70. The detection needles 60 and the ignition needles 70 are arranged opposite to each other, i.e., one is arranged on one installation block. Optionally, a first square sealing gasket is arranged between the detection needles 60 and the cover body 11 to achieve better sealing effect. Similarly, a second square sealing gasket is arranged between the ignition needles 70 and the cover body 11. The second blocking block 111 is further provided with third installation holes for cooperating with the first installation holes, the second installation holes, and the abutting protrusion 118 to fix the flow distribution plate 20.

[0042] The passage pipe 12 is substantially in the shape of a semicircular channel, and a gas passage is arranged on the passage pipe 12. The passage pipe 12 is provided with a circular flange 120 at the end away from the cover body 11, and the passage pipe 12 is connected with the fan 200 through the circular flange 120. In one embodiment, the cover body 11 and the passage pipe 12 are integrally formed by casting process.

[0043] The shunt plate 20 is installed on the cover body 11 and is used to shunt the mixed gas in the cover body 11. The shunt plate 20 comprises a plate body 21, a mounting portion 22 extending outward from the plate body 21, and an abutting portion 23. The plate body 21 is substantially circular. Each shunt hole 210 is arranged in a region of the plate body 21 above the first blocking block 110. Each shunt hole 210 forms a shunt region in a triangular structure, similar to the structure of the first blocking block 110, so that the mixed gas can flow along the shunt flow channel. The diameter of the shunt hole 210 is calculated according to the intake area and the combustion area of the combustion cylinder 50. The intake area is greater than the combustion area to ensure the stability of the flame of the combustion cylinder 50 and prevent the phenomenon of backfire or misfire. Backfire occurs when the speed of the gas leaving the fire hole is less than the burning speed, causing the flame to shrink into the fire hole, resulting in incomplete combustion of the mixed gas inside the burner, causing the burner to burn out. In an embodiment, the diameter of the shunt hole 210 is greater than the diameter of the gas outlet hole of the combustion cylinder 50 to ensure that the intake rate is greater than the outlet rate. Optionally, the plate body 21 is provided with a positioning hole matched with the third mounting hole. The plate body 21 is also provided with a clearance notch for avoiding the mounting block. In this embodiment, a plurality of heat absorption windows 211 (as shown in Figure 7 The plate body 21 and the inner wall of the cover body 11 are provided with a plurality of heat absorption windows 211. When the burner flange plate 40 is installed on the cover body 11, part of the heat of the burner flange plate 40 can be absorbed through the heat absorption windows 211 to reduce the heat on the burner flange plate 40 and further increase the temperature of the mixed gas.

[0044] The mounting portion 22 is a long strip-shaped support strip. The number of mounting portions 22 is multiple. Each mounting portion 22 is uniformly distributed and arranged. In this embodiment, the number of mounting portions 22 is seven. The mounting portion 22 is clamped in the clamping groove 117 and is fixed by cooperating with the first mounting hole, the heat insulation pad 30, and the burner flange plate 40. Since the mounting portion 22 is clamped in the clamping groove 117, the mounting portion 22 and the second annular step form a planar shape to improve the sealing performance of the equipment. The abutting portion 23 is a trapezoidal structure. The end of the abutting portion 23 abuts against the abutting protrusion 118 to block and shunt the mixed gas entering through the channel pipe 12.

[0045] The heat insulation pad 30 is in a disc structure, which is used for separating the burner channel cover 10 and the burner flange plate 40, preventing the burner channel cover 10 from directly contacting the burner flange plate 40 to transfer the temperature and reduce the temperature of the burner channel cover 10. The heat insulation pad 30 comprises an outer ring 31, an inner ring 32 and a plurality of connecting strips 33 connecting the outer ring 31 and the inner ring 32, each connecting strip 33 is uniformly distributed and forms a plurality of annular holes with the outer ring 31 and the inner ring 32, the annular holes are arranged corresponding to the heat absorption window 211, on the one hand, the low-temperature mixed gas can absorb part of the heat of the burner flange plate 40, on the other hand, the heat insulation pad 30 is arranged between the burner channel cover 10 and the burner flange plate 40, which can avoid the influence of water vapor in the high-temperature flue gas. Optionally, a first air avoidance position is arranged on the annular hole, which is used for avoiding the installation of some equipment on the cover body 11, which will not be described here. In an embodiment, the heat insulation pad 30 is but not limited to an aluminum silicate fiber plate. In other embodiments, the full premix burner 100 can be installed with the heat insulation pad 30 or without the heat insulation pad 30, which can be added or removed according to the specific situation.

[0046] The burner flange plate 40 is installed on the cover body 11 and is used for installing the combustion cylinder 50. The burner flange plate 40 comprises a disc body 41 and a boss 42. The disc body 41 is located on the cooling cavity of the burner channel cover 10 and is used for pressing the baffle 20 and the heat insulation pad 30, so that the mixed gas can flow along the shunt flow channel of the cooling cavity. The disc body 41 is provided with a second air avoidance position and a plurality of convex blocks. The second air avoidance position is used for avoiding the detection needle 60 and the ignition needle 70. Each convex block is uniformly distributed and is used for enhancing the strength of the disc body 41. In an embodiment, the convex block is in a strip structure. The boss 42 is in a cylindrical structure and is located above the shunt area, which is used for collecting the mixed gas flowing out of the shunt hole 210 and then distributing the mixed gas for combustion through the combustion cylinder 50. Optionally, the top of the boss 42 is provided with a disc gas outlet hole 420, which is coaxial with the combustion cylinder 50.

[0047] The combustion cylinder 50 is installed on the boss 42 and is used for distributing the mixed gas and igniting the mixed gas to realize stable combustion. In the embodiment, the combustion cylinder 50 adopts the structure of CN217235584U. The structure of the combustion cylinder 50 of the present application can also adopt other types of combustion cylinders 50, which will not be described here.

[0048] The working principle of the full premix burner 100 of the present application is as follows: Figure 1 and Figure 7, start the fan 200, open the gas valve, the fan 200 will low temperature air and gas, suction into the premixer, mixing, low temperature mixed gas after mixing by gas passage into the cover body 11, in the cover body 11 by the first blocking block 110, second blocking block 111, flow divider 20, burner flange 40, into two flow divider flow, start to flow, continue to flow into the low temperature mixed gas in the burner passage cover 10, preheating in the flow divider flow, take away the heat generated by the burner in the burner passage cover 10, the mixed gas after preheating is collected in the boss 42 of the burner flange 40 after flow division, then collected in the boss 42 of the burner flange 40, finally, flow into the combustion cylinder 50 to ignite and burn.

[0049] Wherein, the flow divider hole 210 can slow down the flow speed of the mixed gas in the cooling cavity, increase its residence time, the boss 42 is used for buffering the mixed gas flowing out of the flow divider hole 210, so that the mixed gas is stable, and then is transported to the combustion cylinder 50, which can enhance the combustion stability.

[0050] The full premix burner 100 of the application can further reduce the temperature of the burner passage cover 10 by setting the burner passage cover 10 and the combustion cylinder 50, the burner passage cover 10 has a gas passage, a cooling cavity and a flow divider hole 210, the mixed gas flows into the cooling cavity from the gas passage, and the temperature of the burner passage cover 10 is reduced, the influence of high-temperature flue gas on the service life of the burner passage cover 10 is reduced, and the risk of overheating is reduced, the mixed gas after preheating flows out to the combustion cylinder 50 through the flow divider hole 210, since the low-temperature gas is preheated, the combustion speed is improved, and the combustion stability is enhanced.

[0051] The full premix burner 100 of the application can cool the burner passage cover 10 without using the heat insulation pad 30 through the cooling cavity of the burner passage cover 10, and has good cooling effect, low cost and low maintenance cost.

[0052] The full premix burner 100 of the application can improve the cooling effect of the cooling cavity on the burner passage cover 10 by the cooling cavity of the burner passage cover 10 and the heat insulation pad 30, the low-temperature mixed gas can absorb the heat generated by the burner while radiating the burner passage cover 10, preheat the burner, the low-temperature mixed gas after preheating can improve the combustion speed and enhance the combustion stability.

[0053] In another embodiment, the application further provides a full premix gas heating water heater, comprising the full premix burner 100 of the above-mentioned embodiment, the full premix burner 100 has a cooling cavity for cooling the burner passage cover 10, which can further reduce the temperature of the burner passage cover 10, reduce the influence of high-temperature flue gas on the service life, and reduce the risk of overheating.

[0054] The technical features of the above-mentioned embodiments can be combined in any way, and for the sake of brevity, not all possible combinations of the technical features in the above-mentioned embodiments are described, but as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the description.

[0055] The above-mentioned embodiments only express several embodiments of the application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the application, a number of modifications and improvements can be made, which are within the scope of the application. Therefore, the scope of protection of the patent of the application should be subject to the appended claims.

Claims

1. A fully premixed burner, characterized by, The burner passage cover is provided with a gas passage, a cooling cavity and a plurality of shunt holes, the gas passage is communicated with the cooling cavity, each of the shunt holes is communicated with the cooling cavity, mixed gas is transported from the gas passage into the cooling cavity to cool the burner passage cover, and the preheated mixed gas is shunted through the shunt holes to ignite and burn on the combustion cylinder; the burner passage cover comprises a cover main body, a passage pipe and a shunt plate, the cover main body is internally provided with a first blocking block and a second blocking block, the first blocking block and the second blocking block, the inner wall of the cover main body and the shunt plate form the cooling cavity, the passage pipe is communicated with the cooling cavity, and the shunt holes are arranged on the shunt plate; the first blocking block is in a clamping opening structure, and the clamping opening of the first blocking block is arranged to face away from the passage pipe; the second blocking block is in a Y-shaped structure, and the Y-shaped opening of the second blocking block is arranged in the clamping opening of the first blocking block; the first blocking block and the second blocking block divide the cover main body into two symmetrically arranged shunt flow channels, the shunt flow channels comprise a first flow channel, a second flow channel, a third flow channel, a fourth flow channel and a fifth flow channel along the gas flow direction, the minimum diameter of the first flow channel is greater than the maximum diameter of the second flow channel, the maximum diameter of the second flow channel is not greater than the minimum diameter of the third flow channel, the minimum diameter of the third flow channel is not less than the maximum diameter of the fourth flow channel, and the maximum diameter of the fourth flow channel is not greater than the minimum diameter of the fifth flow channel; the shunt plate comprises a plate main body, a mounting portion extending outward from the plate main body and an abutting portion, each of the shunt holes is arranged above the first blocking block and forms a triangular shunt area; the cover main body is provided with a first mounting hole, a clamping groove and an abutting protrusion, the first mounting hole cooperates with the clamping groove to fix the mounting portion, and the abutting protrusion abuts against the abutting portion.

2. The fully premixed burner of claim 1, wherein A plurality of heat absorption windows are arranged between the plate main body and the inner wall of the cover main body.

3. The fully premixed burner of claim 1, wherein, The full-premix burner further comprises a heat insulation pad and a burner flange plate, the heat insulation pad is used to separate the burner passage cover and the burner flange plate, and the burner flange plate is used to mount the combustion cylinder.

4. The fully premixed burner of claim 3, wherein, The heat insulation pad comprises an outer ring, an inner ring and a plurality of connecting strips connecting the outer ring and the inner ring, each of the connecting strips is arranged in a uniform distribution and forms a plurality of annular holes with the outer ring and the inner ring.

5. The fully premixed burner of claim 3, wherein, The burner flange plate comprises a disc body and a boss, the disc body is used to compress the shunt plate and the heat insulation pad, and the boss is used to collect mixed gas flowing out of the shunt holes.

6. A fully premix gas combi boiler, characterized in that, The full-premix burner comprises any one of claims 1-5.

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