CN114608009A

CN114608009A - Full premix combustor and main heat exchanger thereof

Info

Publication number: CN114608009A
Application number: CN202210309542.1A
Authority: CN
Inventors: 陶龙礼; 陈永钊
Original assignee: Guangzhou Devotion Home Environment Technology Co ltd
Current assignee: Guangzhou Devotion Home Environment Technology Co ltd
Priority date: 2022-03-28
Filing date: 2022-03-28
Publication date: 2022-06-10

Abstract

The invention discloses a full premix burner and a main heat exchanger thereof, wherein the burner comprises a mounting seat, a distribution barrel and a combustion barrel; the mounting seat is provided with an air inlet communicated with the distribution cylinder, and the distribution cylinder is provided with a plurality of air distribution holes; the combustion cylinder is installed in the outside of distributing cylinder, has the ventilation clearance between combustion cylinder and the distributing cylinder, is equipped with a plurality of burner ports on the combustion cylinder, and the burner port passes through the ventilation clearance and divides the gas hole intercommunication. Above-mentioned full premix combustor is through setting up a distribution section of thick bamboo and a combustion chamber, and the combustion gas after will premixing distributes at first in a distribution section of thick bamboo, and rethread ventilation gap forms evenly distributed, then burns through a combustion chamber, lays through reasonable branch gas pocket and burner port, improves flame burning's stability and combustion efficiency, makes the life of combustor longer, and the cost is lower.

Description

Full premix combustor and main heat exchanger thereof

Technical Field

The invention relates to the technical field of combustors, in particular to a full premix combustor and a main heat exchanger thereof.

Background

The operation principle of the full-premixing condensing furnace is as follows: the gas enters the premixing cavity through the gas control proportional valve, the air enters the premixing cavity inside the furnace through the outer shaft of the balanced chimney, the gas and the air are mixed in the premixing cavity and then enter the fan, the fan conveys mixed gas of the gas and the air into the combustion chamber of the main heat exchanger for combustion through rotation, high-temperature flue gas is generated after combustion, heat exchange is completed in the main heat exchanger, the heating channel conveys the heat into the chamber, and the flue gas is discharged to the outside through the inner shaft of the balanced chimney.

The full premix burner is arranged in the main heat exchanger, and the gas and the air are fully premixed in proportion before the mixed gas is combusted. The full premix combustor burning rate does not receive mixing time and mixing space restriction, has that burning rate is fast, and the mist burns in the twinkling of an eye after leaving combustor fire hole, and the burning is abundant, and oxynitride discharges fewly, and advantages such as the noise is low have obtained more and more application, especially on condensing water heater and condensation heating stove. However, the use and the start of the full-premix condensing furnace in China are relatively late, the mainstream of the current heating furnace market is a non-full-premix conventional gas heating furnace, and the full-premix burner is not mature in technology.

The existing burner has the following disadvantages: 1. the existing burner has unreasonable structure, when the gas is insufficient or the hole part of the burner is blocked, the flame combustion is unstable, the phenomena of tempering and fire dropping exist, the combustion is incomplete, the stable work of the burner is influenced, and simultaneously, detonation and noise can be caused, even the burner is damaged; 2. in the prior art, a main heat exchanger is insufficient in combustion in the combustion process, generates a large amount of carbon solid particles, is used for a long time, causes the fire hole of a burner to be blocked, reduces the heat efficiency, further causes the burner to be damaged, and reduces the service life of the burner; 3. the metal fiber material adopted by the full premix burner in the existing market part has complex process and higher cost.

Disclosure of Invention

In order to overcome the defects of the prior art, one of the objectives of the present invention is to provide a fully premixed burner, which solves the above-mentioned conventional problems, wherein premixed combustion gas is uniformly distributed in the burner, and then is combusted, and through reasonable arrangement of combustion holes, the stability and combustion efficiency of flame combustion are improved, so that the burner has a longer service life and a lower cost.

The second purpose of the invention is to provide a main heat exchanger using the fully premixed burner.

One of the purposes of the invention is realized by adopting the following technical scheme:

a full premix burner comprises a mounting seat, a distribution barrel and a combustion barrel, wherein the distribution barrel and the combustion barrel are mounted on the mounting seat; the mounting seat is provided with an air inlet communicated with the distribution cylinder, and the distribution cylinder is provided with a plurality of air distribution holes; the combustion cylinder is installed the outside of distributor cylinder, the combustion cylinder with ventilation gap has between the distributor cylinder, be equipped with a plurality of burner ports on the combustion cylinder, the burner port pass through ventilation gap with divide the gas hole intercommunication.

Further, the gas distribution holes comprise first gas distribution holes and second gas distribution holes, the first gas distribution holes are uniformly distributed to form a first distribution hole group, the second gas distribution holes are uniformly distributed to form a second distribution hole group, and the first distribution hole group and the second distribution hole group are alternately distributed.

Furthermore, the first air distribution hole and the second air distribution hole are round holes formed by punch forming.

Further, the diameter of the first gas distribution hole is smaller than that of the second gas distribution hole.

Further, the distance between the first air distribution holes and the second air distribution holes in the transverse direction is equal to the distance between the first air distribution holes and the second air distribution holes in the longitudinal direction.

Further, the combustion holes comprise a plurality of main fire holes, fire stabilizing holes and tempering preventing holes; the main fire holes are uniformly arranged to form a plurality of rows of longitudinal main fire hole groups, and the longitudinal main fire hole groups form a plurality of groups of transverse main fire groups by taking four groups as units; the transverse fire stabilizing hole groups are arranged between two groups of transverse main fire groups, and the fire stabilizing holes are combined in pairs to form a plurality of longitudinal fire stabilizing hole groups which are uniformly distributed in the longitudinal direction; the anti-backfire holes are arranged between the two groups of longitudinal fire stabilizing hole groups.

Furthermore, the main fire hole is a round hole; the fire stabilizing hole and the tempering preventing hole are both in a strip shape.

Further, the mount pad includes the seat body, certainly first installation department and the second installation department that the seat body extends, the external diameter of first installation department is greater than the external diameter of second installation department, first installation department, second installation department are in buckle formation stair structure in proper order on the seat body.

Further, this full premix combustor still includes and is used for sealing the sealed dish at the top of a distribution section of thick bamboo, a combustion section of thick bamboo, sealed dish includes the dish body, certainly first sealed flange and the second sealed flange that the dish body extends, the external diameter of first sealed flange is less than the external diameter of second sealed flange, first sealed flange, second sealed flange are in buckle formation stair structure in proper order on the dish body, the dish body inlays in a distribution section of thick bamboo, the outer wall of first sealed flange and the inner wall looks butt of a distribution section of thick bamboo, the outer wall of second sealed flange with the inner wall looks butt of a combustion section of thick bamboo.

The second purpose of the invention is realized by adopting the following technical scheme:

a main heat exchanger comprising a fully premixed burner as described above.

Compared with the prior art, the invention has the beneficial effects that:

according to the full-premix burner, the distribution cylinder and the combustion cylinder are arranged, premixed combustion gas is firstly distributed in the distribution cylinder, then is uniformly distributed through the ventilation gap, and then is combusted through the combustion cylinder, and the reasonable distribution holes and the combustion holes are distributed, so that the stability and the combustion efficiency of flame combustion are improved, the service life of the burner is longer, and the cost is lower.

The full premix burner can maintain stable flame operation in various states through the matching of the flame stabilizing holes, the tempering preventing holes and the main fire holes, so that the full premix burner can burn more fully, has higher combustion efficiency, and can solve the problems of unstable combustion and backfire and misfire of the conventional full premix burner.

Drawings

FIG. 1 is a schematic diagram of the main heat exchanger of the present invention;

FIG. 2 is a schematic view of the internal structure of the main heat exchanger shown in FIG. 1;

FIG. 3 is a schematic view of the installation of the fully premixed burner of FIG. 2 on the main heat exchanger;

FIG. 4 is a schematic perspective view of the fully premixed burner shown in FIG. 3;

FIG. 5 is an exploded view of the fully premixed combustor shown in FIG. 4;

FIG. 6 is a side view of the fully premixed combustor shown in FIG. 4;

FIG. 7 is a cross-sectional view taken along line A-A of FIG. 6;

FIG. 8 is a view of the dispensing cartridge of FIG. 5 in an expanded state;

FIG. 9 is an enlarged view at B shown in FIG. 8;

FIG. 10 is a deployed state view of the combustion can shown in FIG. 5;

fig. 11 is an enlarged view of fig. 10 at C.

In the figure: 100. a fully premixed burner; 90. a premix chamber; 80. a fan; 70. a mixed gas delivery duct; 60. a stainless steel coil pipe; 50. a smoke collection cavity; 40. sealing the disc; 41. a disc body; 42. a first sealing flange; 43. a second sealing flange; 30. a combustion can; 31. a main fire hole; 32. a fire stabilizing hole; 33. a flashback-preventing hole; 34. a first wind guiding area; 35. a second wind guiding area; 20. a dispensing cartridge; 21. a first gas-dividing hole; 22. a second gas distribution hole; 10. a mounting seat; 11. a seat body; 110. an air inlet; 111. a fixing hole; 12. a first mounting portion; 13. a second mounting portion.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the description of the present invention, it should be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly connected" to another element, there are no intervening elements present.

Referring to fig. 1 to 3, a main heat exchanger according to a preferred embodiment of the present invention is installed in a fully premixed condensing boiler or a hot water boiler, pre-mixes air and gas, burns the pre-mixed gas, heats system water to raise temperature, and finally discharges the system water through a smoke outlet.

Specifically, this main heat exchanger includes along the premixing chamber 90 that airflow direction set gradually, fan 80, the mist transfer passage 70, full premix combustor 100, stainless steel coil 60 and smoke collection chamber 50, premixing chamber 90 has air inlet and gas inlet, inhale air and gas respectively and mix in premixing chamber 90, install the ignition needle and the flame detection needle that are located full premix combustor 100 one side on the main heat exchanger, the ignition needle is used for lighting the mist, the flame detection needle is used for detecting whether flame lights or extinguishes, the flue gas discharge passageway has between stainless steel coil 60 and the full premix combustor 100, after being used for the heat transfer of high temperature flue gas and stainless steel coil 60, concentrate again and discharge to smoke collection chamber 50. The working principle of the main heat exchanger is as follows: the air and the gas are initially mixed in the premixing cavity 90, the mixed gas is conveyed to the fully premixed burner 100 by the fan 80 to be uniformly distributed, then the mixed gas is ignited under the action of an ignition needle, heat is transferred to cold water in the stainless steel coil 60, and the flue gas after heat exchange is collected in the smoke collection cavity 50 and then discharged.

In one embodiment, referring to fig. 3 to 11, the fully premixed burner 100 includes a mounting base 10, a distribution barrel 20 and a combustion barrel 30 mounted on the mounting base 10.

Referring to fig. 3-5, the mounting base 10 includes a base body 11, a first mounting portion 12 and a second mounting portion 13 extending from the base body 11 toward the dispensing cartridge 20; the seat body 11 is approximately disc-shaped, and the seat body 11 is provided with an air inlet 110 and a fixing hole 111 arranged around the air inlet 110; the air inlet holes 110 longitudinally penetrate through the middle parts of the first installation part 12 and the second installation part 13 and are used for allowing the mixed gas to flow into the fully premixed burner 100; the number of the fixing holes 111 is four, and the fixing holes 111 are uniformly distributed, so that the mounting base 10 can be fixed on the mixed gas inlet of the main heat exchanger by screws or bolts.

In one embodiment, as shown in fig. 7, the outer diameter of the first mounting portion 12 is greater than the outer diameter of the second mounting portion 13, and the first mounting portion 12 and the second mounting portion 13 are sequentially bent on the seat body 11 to form a stepped structure, so that a ventilation gap is formed between the distribution cylinder 20 and the combustion cylinder 30. In another embodiment, the first mounting portion 12 and the second mounting portion 13 are both circular, the first mounting portion 12 and the first mounting portion 12 are concentric circles, and as shown in fig. 3, after the mounting seat 10 is fixedly mounted on the mixed gas inlet of the main heat exchanger by screws or screws, the tops of the screws or screws are abutted against the combustion cylinder 30, so that the combustion cylinder 30 is preferably fixed, and optionally, after the distribution cylinder 20 and the combustion cylinder 30 are fixedly mounted on the mounting seat 10, they can be fixed or sealed by welding, such as spot welding or full welding.

Referring to fig. 8 and 9, the distribution cylinder 20 is a cylindrical cylinder, and is coaxially fitted to the outer edge of the second mounting portion 13 of the mounting base 10 and communicated with the air inlet 110, and a plurality of air distribution holes are formed on the distribution cylinder 20 for uniformly distributing the mixed gas, specifically, the air distribution holes include a plurality of first air distribution holes 21 and second air distribution holes 22, each first air distribution hole 21 is uniformly distributed to form a first distribution hole group, the first distribution hole group may be formed by transversely arranging the first air distribution holes 21 or longitudinally arranging the first air distribution holes, each second air distribution hole 22 is uniformly distributed to form a second distribution hole group, the second distribution hole group may be formed by transversely arranging the second air distribution holes 22 or longitudinally arranging the second air distribution holes 22, wherein the first air distribution holes 21 and the second air distribution holes 22 are air distribution holes having the same shape or different shapes, such as one or a combination of two or more than two of circular holes, elongated holes, elliptical holes, square holes, and the like, in the present embodiment, the first air-dividing hole 21 and the second air-dividing hole 22 are both circular holes formed by press molding. Optionally, the diameter of the first sub-air holes 21 is the same as or different from the diameter of the second sub-air holes 22, in one embodiment, the diameter of the first sub-air holes 21 is 1.2mm to 2.8mm, and the diameter of the second sub-air holes 22 is 1.2mm to 2.8mm, for example, the diameter of the first sub-air holes 21 and the diameter of the second sub-air holes 22 are, but not limited to, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2.0mm, 2.2mm, 2.4mm, 2.6mm, and 2.8 mm. In the present embodiment, the diameter of the first minute air hole 21 is smaller than the diameter of the second minute air hole 22.

As shown in fig. 8, the distribution cylinder 20 is expanded from a rectangular metal plate such as stainless steel, pure copper, etc., the plate thickness is 0.7mm to 1.5mm, the first distribution hole group and the second distribution hole group are alternately arranged in the horizontal direction and/or the longitudinal direction, for example, the first distribution hole group, the second distribution hole group, the first distribution hole group, and the second distribution hole group are sequentially arranged from top to bottom in the longitudinal direction, and the second distribution hole group, the first distribution hole group, the second distribution hole group, and the first distribution hole group are sequentially arranged from left to right in the horizontal direction, and thus the distribution is cyclically arranged; preferably, the first distribution hole groups and the second distribution hole groups are alternately arranged in the transverse direction and the longitudinal direction, in one embodiment, as further shown in fig. 9, the distances b1 between the adjacent first air distribution holes 21 and the adjacent second air distribution holes 22 in the transverse direction and the distances b2 between the adjacent first air distribution holes 21 and the adjacent second air distribution holes 22 in the longitudinal direction are the same or different, and in this embodiment, the distances b1 between the adjacent first air distribution holes 21 and the adjacent second air distribution holes 22 in the transverse direction and the distances b2 between the adjacent first air distribution holes 21 and the adjacent second air distribution holes 22 in the longitudinal direction are the same, that is, b1 is b2, and b1 (or b2) ranges from 3mm to 8mm, for example: 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, make the first minute gas hole 21, the second minute gas hole 22 that the diameter size is different transversely, vertical evenly distributed, when the gas mixture enters into the combustor, under the gas pocket effect of distributor cylinder 20 evenly distributed, make the air velocity field evenly spread to the combustor cylinder 30, in order to guarantee that the air velocity of each point is all greater than the burning velocity under minimum load, make the gas mixture burn more abundant, the noise is less, the flame distributes evenly and more stably. Preferably, the dispensing cartridge 20 is integrally formed of a stainless steel material.

Referring to fig. 10 and 11 again, the combustion cylinder 30 is a cylindrical cylinder, and is coaxially matched with the outer edge of the first mounting portion 12 of the mounting base 10, that is, mounted on the outer side of the distribution cylinder 20, the inner diameter of the combustion cylinder 30 is greater than the outer diameter of the distribution cylinder 20, the combustion cylinder 30 and the distribution cylinder 20 are concentric cylinders, the combustion cylinder 30 is provided with a plurality of combustion holes, the combustion cylinder 30 is communicated with the distribution holes through ventilation gaps, and is used for combusting the mixed gas distributed by the distribution cylinder 20, and can ensure the stability and combustion efficiency of flame combustion, specifically, the combustion holes include a plurality of main fire holes 31, flame stabilizing holes 32 and anti-backfire holes 33. In the longitudinal direction, the main fire holes 31 are uniformly arranged to form a plurality of longitudinal main fire hole groups, in the transverse direction, the longitudinal main fire hole groups form a plurality of groups of transverse main fire groups by taking four groups as units, and fire group gaps are formed among the transverse main fire groups; in one embodiment, the main fire holes 31 are, but not limited to, circular holes, and may also be elliptical holes, and in this embodiment, the main fire holes 31 are circular holes, and the purpose of designing the main fire holes 31 as circular holes is to prevent the burner from backfiring. The backfire is generated because when the speed of the fuel gas leaving the fire hole is less than the burning speed, the flame will retract into the fire hole, so that the mixed gas is burnt and heated in the burner, and incomplete combustion is formed, and the burner is burnt out. Because the combustion speed of the premixing burner is high, the tempering is easily caused due to the oversize design of the main fire hole 31, so that the main fire hole 31 is a small round hole, the tempering phenomenon of the burner can be avoided, the combustion is more sufficient, and the combustion efficiency is improved; however, when the main fire hole 31 is too small, the misfire phenomenon is easily caused, and the combustion is unstable and easily extinguished. In one embodiment, the diameter of the main fire hole 31 is 0.5mm to 0.9mm, such as 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9 mm.

The fire stabilizing holes 32 are used for stabilizing combustion and preventing fire from escaping, and specifically, in the transverse direction, the fire stabilizing holes 32 are uniformly arranged to form a plurality of transverse fire stabilizing hole groups, and the transverse fire stabilizing hole groups are arranged between two groups (one group is formed by four rows, and eight rows in total) of transverse main fire groups. In one embodiment, the fire stabilizing holes 32 are substantially elongated, and in the longitudinal direction, each fire stabilizing hole 32 is combined with each other two by two to form a plurality of longitudinally and uniformly distributed longitudinal fire stabilizing hole groups, and it can be understood that each longitudinal fire stabilizing hole group is composed of two fire stabilizing holes 32. In one embodiment, the diameter of the main fire hole 31 is larger than the width of the fire stabilizing hole 32 and smaller than the length of the fire stabilizing hole 32, and since the sectional area of the single fire stabilizing hole 32 is larger than the sectional area of the single main fire hole 31, in order to prevent a fire-off phenomenon which may be caused locally by the burner in a full-load fire-stabilizing state, the fire stabilizing hole 32 is arranged between two groups of transverse main fire groups, the air velocity of the fire stabilizing hole 32 is lower than that of the main fire hole 31 in the fire-stabilizing state, and the fire stabilizing hole 32 can stably burn and prevent the occurrence of fire-off, in one embodiment, the width of the fire stabilizing hole 32 is 0.35mm-0.6mm, and the length of the fire stabilizing hole 32 is 4mm-8 mm.

In order to prevent the backfire phenomenon from occurring in the flame stabilizing holes 32 when the air flow velocity is low during low load operation, specifically, the backfire preventing holes 33 are arranged between two longitudinal groups of flame stabilizing holes, the backfire preventing holes 33 are substantially strip-shaped, the length of the backfire preventing holes 33 is smaller than that of the flame stabilizing holes 32, the width of the backfire preventing holes 33 is equal to that of the flame stabilizing holes 32, the diameter of the main flame holes 31 is larger than that of the backfire preventing holes 33 and smaller than that of the backfire preventing holes 33, the cross-sectional area of the backfire preventing holes 33 is smaller, the air flow velocity of the backfire preventing holes 33 is larger than that of the flame stabilizing holes 32, so that more stable combustion can be maintained in the low flame state, and the backfire preventing holes 33 are arranged between the two longitudinal groups of flame stabilizing holes 32 and are closer to the flame stabilizing holes 32, so that the backfire phenomenon occurring in the low load state can be prevented by the cooperation of the flame stabilizing holes 32, the backfire preventing holes 33 and the main flame stabilizing holes 31, the full premix burner 100 can maintain stable flame operation in various states, so that the combustion is more sufficient, the combustion efficiency is higher, and the problems of unstable combustion, tempering and fire release of the existing full premix burner 100 can be solved. In one embodiment, the length of the flashback-preventing hole 33 is 0.3-0.4 of the length of the flame-stabilizing hole 32. Optionally, the tempering-proof holes 33 are divided into a first tempering-proof hole 33 and a second tempering-proof hole 33 with the same size, and the first tempering-proof hole 33 and the second tempering-proof hole 33 are arranged side by side.

As shown in fig. 11, the combustion tube 30 is made of a rectangular metal plate such as stainless steel or pure copper in an open state, preferably, the combustion tube 30 is made of stainless steel integrally, the plate thickness is 0.7mm to 1.5mm, the length and width of the combustion tube 30 in the open state is greater than the length and width of the distribution tube 20 in the open state, as shown in a developed state, the area occupied by the main flame holes 31 on the combustion tube 30 is greater than the total area occupied by the flame stabilizing holes 32 and the flame-proof holes 33 on the combustion tube 30, in another embodiment, the combustion tube 30 is further provided with first air guiding regions 34 and second air guiding regions 35 at opposite ends, the first air guiding regions 34 are disposed close to the mounting seat 10, the second air guiding regions 35 are disposed close to the sealing plate 40, that is, the first air guiding regions 34 and the second air guiding regions 35 are disposed at opposite ends of the main flame stabilizing holes 31 or the flame-proof holes 32 or the flame-proof holes 33, and the structure is used for guiding the mixed gas from the distribution barrel 20 to the middle part of the combustion barrel 30 from the two ends of the combustion barrel 30 by matching with the structure of the mounting seat 10. In one embodiment, the width c2 of the first wind guiding region 34 is greater than the width c1 of the second wind guiding region 35, so that the flame is far away from the mounting seat 10.

The fully premixed burner 100 is provided with the distribution cylinder 20 and the combustion cylinder 30, premixed combustion gas is firstly distributed in the distribution cylinder 20, then is uniformly distributed through the ventilation gap, and then is combusted through the combustion cylinder 30, and the stability and the combustion efficiency of flame combustion are improved through reasonable arrangement of the air distribution holes and the combustion holes, so that the burner is longer in service life and lower in cost.

The top of the distribution barrel 20 and the combustion barrel 30 of the present invention may be welded separately to form a top seal, or integrally formed to seal the top, or provided with other sealing means. Referring to fig. 7, the fully premixed burner 100 further includes a sealing plate 40, and the sealing plate 40 is used for sealing the top of the distribution cylinder 20 and the top of the combustion cylinder 30 respectively, so that the mixed gas cannot flow out of the combustion cylinder 30 through the top of the distribution cylinder 20, or flow back from the combustion cylinder 30 into the distribution cylinder 20, or flow out directly from the top of the combustion cylinder 30. Specifically, the sealing plate 40 includes a plate body 41, and a first sealing flange 42 and a second sealing flange 43 extending from the plate body 41 in a direction away from the distribution cylinder 20, where the plate body 41 is substantially disc-shaped, an outer diameter of the first sealing flange 42 is smaller than an outer diameter of the second sealing flange 43, the first sealing flange 42 and the second sealing flange 43 are sequentially bent on the plate body 41 to form a stepped structure, the plate body 41 is embedded in the distribution cylinder 20, an outer wall of the first sealing flange 42 abuts against an inner wall of the distribution cylinder 20, and an outer wall of the second sealing flange 43 abuts against an inner wall of the combustion cylinder 30 to form a stepped sealing structure, and optionally, after the distribution cylinder 20 and the combustion cylinder 30 are fixedly mounted on the sealing plate 40, they may be fixed or sealed by welding, such as spot welding or full welding.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A full premix burner is characterized by comprising a mounting seat, a distribution barrel and a combustion barrel, wherein the distribution barrel and the combustion barrel are mounted on the mounting seat; the mounting seat is provided with an air inlet communicated with the distribution cylinder, and the distribution cylinder is provided with a plurality of air distribution holes; the combustion cylinder is installed the outside of distributor cylinder, the combustion cylinder with ventilation gap has between the distributor cylinder, be equipped with a plurality of burner ports on the combustion cylinder, the burner port pass through ventilation gap with divide the gas hole intercommunication.

2. The full premix burner as recited in claim 1, wherein the gas distribution holes comprise first gas distribution holes and second gas distribution holes, each of the first gas distribution holes is uniformly distributed to form a first distribution hole group, each of the second gas distribution holes is uniformly distributed to form a second distribution hole group, and the first distribution hole group and the second distribution hole group are alternately arranged.

3. The full premix burner of claim 2, wherein the first and second louvers are circular holes formed by press forming.

4. The fully premixed combustor according to claim 2, wherein a diameter of the first louvers is smaller than a diameter of the second louvers.

5. The fully premixed combustor according to claim 2, wherein a distance between the first louver and the second louver in a transverse direction is equal to a distance between the first louver and the second louver in a longitudinal direction.

6. The full premix burner as in claim 1, wherein the combustion holes comprise a plurality of main fire holes, flame stabilizing holes and flashback preventing holes; the main fire holes are uniformly arranged to form a plurality of rows of longitudinal main fire hole groups, and the longitudinal main fire hole groups form a plurality of groups of transverse main fire groups by taking four groups as units; the transverse fire stabilizing hole groups are arranged between two groups of transverse main fire groups, and the fire stabilizing holes are combined in pairs to form a plurality of longitudinal fire stabilizing hole groups which are uniformly distributed in the longitudinal direction; the anti-backfire holes are arranged between the two groups of longitudinal fire stabilizing hole groups.

7. The fully premixed combustor of claim 6, wherein the main fire holes are round holes; the fire stabilizing hole and the tempering preventing hole are both in a strip shape.

8. The full premix combustor of claim 1, wherein the mount pad includes a base body, a first mounting portion and a second mounting portion extending from the base body, an outer diameter of the first mounting portion is greater than an outer diameter of the second mounting portion, and the first mounting portion and the second mounting portion are bent in sequence on the base body to form a stepped structure.

9. The full premix burner of claim 1, further comprising a sealing disk for sealing the top of the distribution barrel and the top of the combustion barrel, wherein the sealing disk comprises a disk body, and a first sealing flange and a second sealing flange extending from the disk body, the outer diameter of the first sealing flange is smaller than that of the second sealing flange, the first sealing flange and the second sealing flange are sequentially bent on the disk body to form a stepped structure, the disk body is embedded in the distribution barrel, the outer wall of the first sealing flange abuts against the inner wall of the distribution barrel, and the outer wall of the second sealing flange abuts against the inner wall of the combustion barrel.

10. A main heat exchanger comprising a fully premixed burner as claimed in any of claims 1 to 9.