CN111947143A

CN111947143A - Full premix combustion assembly, full premix combustor and gas water heater

Info

Publication number: CN111947143A
Application number: CN201910401392.5A
Authority: CN
Inventors: 钱晓林; 梁国荣; 蒋灵; 梁泽锋; 刘锋
Original assignee: Wuhu Midea Kitchen and Bath Appliances Manufacturing Co Ltd
Current assignee: Wuhu Midea Kitchen and Bath Appliances Manufacturing Co Ltd
Priority date: 2019-05-14
Filing date: 2019-05-14
Publication date: 2020-11-17

Abstract

The invention discloses a full premix combustion assembly, a full premix burner and a gas water heater, wherein the full premix combustion assembly comprises: the combustion plate is provided with a slit-shaped combustion hole, the length direction of the combustion hole is taken as the Y direction, and the width direction of the combustion hole is taken as the X direction; the plurality of combustion holes are arranged along the X direction to form a combustion row; the combustion plate is also provided with tempering-proof holes, and the tempering-proof holes are arranged along the X direction to form a tempering-proof row; the area of the combustion hole is larger than that of the tempering-proof hole; the number of the anti-backfire rows and the number of the combustion rows are plural, and the anti-backfire rows and the combustion rows are arranged in a staggered manner along the Y direction. The technical scheme of the invention is beneficial to reducing the cost of the combustion assembly.

Description

Full premix combustion assembly, full premix combustor and gas water heater

Technical Field

The invention relates to the technical field of burners, in particular to a full-premix combustion assembly, a full-premix burner and a gas water heater.

Background

The existing full premix burner is generally of a metal fiber net type, namely, a metal fiber net is arranged at a fire outlet of the burner. The metal fiber net has complex process and higher cost, and is easy to block in the using process, so that insufficient gas combustion is caused, and the reasonable utilization of energy is not facilitated.

Disclosure of Invention

The invention mainly aims to provide a full premix combustion assembly, aiming at reducing the cost of a combustor and ensuring the combustion rate of the combustor.

To achieve the above object, the present invention provides a fully premixed combustion assembly, comprising:

the combustion plate is provided with a slit-shaped combustion hole, the length direction of the combustion hole is taken as the Y direction, and the width direction of the combustion hole is taken as the X direction;

the plurality of combustion holes are arranged along the X direction to form a combustion row;

the combustion plate is also provided with tempering-proof holes, and the tempering-proof holes are arranged along the X direction to form a tempering-proof row; the area of the combustion hole is larger than that of the tempering-proof hole;

the number of the anti-backfire rows and the number of the combustion rows are plural, and the anti-backfire rows and the combustion rows are arranged in a staggered manner along the Y direction.

Optionally, the size of the combustion fire hole in the X direction is 0.6-0.8 times of the distance between two adjacent combustion fire holes in the same combustion row.

Optionally, the distance between two adjacent combustion rows is 0.8-1.0 times of the Y-direction size of the combustion fire holes.

Optionally, the distance between the combustion row and the anti-backfire row is 0.2-0.4 times of the Y-direction size of the combustion hole.

Optionally, the area of the combustion hole is 8-11 times of the area of the anti-backfire hole.

Alternatively, the anti-backfire holes are positioned at both ends of the combustion hole in the Y direction, or correspond to a gap between two adjacent combustion holes of the same combustion row.

Optionally, the anti-backfire rows comprise a first sub-anti-backfire row, the first sub-anti-backfire row comprises at least two rows of anti-backfire holes arranged along the X direction, and the first sub-anti-backfire row is arranged between two adjacent combustion rows.

Optionally, the anti-backfire holes comprise circular holes, and the distance between two rows of the anti-backfire holes in the first sub-anti-backfire row is 1.6-2.5 times of the radial dimension of the anti-backfire hole.

Optionally, the anti-backfire rows comprise a second sub-anti-backfire row, the second sub-anti-backfire row comprises a row of anti-backfire holes arranged along the X direction, and the second sub-anti-backfire row is arranged at the edge of the combustion plate in the Y direction.

Optionally, the fully premixed combustion assembly further comprises any one of a metal fiber mesh, a porous ceramic plate, and a metal wire mesh, which are disposed on a surface of the combustion plate.

Optionally, the combustion plate is made of stainless steel, and the thickness of the combustion plate is 0.5-1.5 mm.

The present invention further provides a fully premixed burner comprising:

a combustion housing having a combustion chamber;

the fan is communicated with the air inlet of the combustion chamber;

the combustion plate of the full-premix combustion assembly is arranged at the air outlet of the combustion chamber;

wherein, full premix combustion assembly includes:

The present invention further provides a gas water heater comprising: a fully premixed combustion assembly; or,

a fully premixed burner;

wherein, full premix combustor includes:

a combustion housing having a combustion chamber;

the fan is communicated with the air inlet of the combustion chamber;

wherein, full premix combustion assembly includes:

According to the technical scheme, when the combustion plate works, the mixed gas is combusted through the combustion holes and the anti-backfire holes, in the combustion process, due to the fact that the area of a combustion row (composed of the combustion holes) is large, the mixed gas is mainly combusted in the combustion holes and is arranged in the anti-backfire rows (composed of the anti-backfire holes) on the periphery of the combustion row, and the amount of the mixed gas which is combusted is smaller than the amount of the mixed gas which is combusted in the combustion row; when the combustion speed in the combustion hole is higher than the injection speed and the tempering phenomenon is about to occur, the tempering trend is blocked by the combustion gas injected in the tempering-proof hole, and the quantity of the combustion gas injected in the tempering-proof hole is larger than that of the tempering gas flow due to the position relation between the tempering-proof hole and the combustion hole, so that the tempering phenomenon can be effectively prevented, the combustion stability of the mixed gas is ensured, and the combustion rate is improved; meanwhile, the combustion row with a large area is arranged, so that sufficient mixed gas can be provided for combustion when the combustion plate is in high-power combustion, and the high-power combustion of the combustion plate is ensured; by arranging the anti-backfire device with a smaller area, the gas flow generated by combustion is further effectively prevented from flowing back to the combustion chamber during low-power combustion; the combustion stability of the combustion plate is further improved because the combustion holes have larger areas and are not easy to block; in addition, the processing and manufacturing cost of the combustion plate is far lower than that of the existing metal fiber mesh, so that the cost of the combustion plate is reduced while the stability and the efficiency of high-power combustion and low-power combustion can be guaranteed.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of an embodiment of a fully premixed combustor according to the present invention;

FIG. 2 is a schematic view showing the arrangement of a part of combustion holes and anti-backflow holes in FIG. 1;

FIG. 3 is an enlarged view of a portion of FIG. 2 at A;

FIG. 4 is a schematic structural view of another embodiment of a fully premixed combustor according to the present invention;

FIG. 5 is a schematic view of another angle of the fully premixed burner of the present invention;

FIG. 6 is a schematic view of the structure of FIG. 5 from another perspective;

FIG. 7 is a schematic view of the combustion casing interior of FIG. 6;

FIG. 8 is a schematic structural view of an embodiment of the fully premixed combustion assembly of the present invention;

FIG. 9 is an enlarged view of a portion of FIG. 8 at B;

FIG. 10 is a schematic view of the internal structure of FIG. 8;

FIG. 11 is an enlarged view of a portion of FIG. 10 at C;

FIG. 12 is a flow chart of a process for manufacturing a combustion assembly.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				100	Combustion plate	110	Burning hole
120	Anti-backfire hole	130	Anti-backfire device
				131	First sub-anti-backfire row	132	Second sub-anti-backfire row
140	Burning line	150	Specific anti-backfire row
				200	Fan blower	300	Combustion casing
310	Combustion chamber	400	Rectifying plate
				500	First combustion plate	510	First combustion hole
600	Second combustion plate	610	Second combustion hole
				560	Combustion gap

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.

In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, "and/or" in the whole text includes three schemes, taking a and/or B as an example, including a technical scheme, and a technical scheme that a and B meet simultaneously; in addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The invention mainly provides a full premix combustion assembly, which is mainly applied to a full premix combustor and is usually arranged at an air outlet of a combustion chamber 310 of the combustor, so that the manufacturing cost of the full premix combustion assembly is reduced, the combustion rate of the full premix combustor is improved, and the combustion stability of the combustor is improved.

The specific structure of the fully premixed combustion assembly will be mainly described below.

Referring to fig. 1-7, in an embodiment of the present invention, the fully premixed combustion assembly includes:

a combustion plate 100, wherein a slit-shaped combustion hole 110 is formed in the combustion plate 100, the length direction of the combustion hole 110 is the Y direction, and the width direction of the combustion hole 110 is the X direction;

the plurality of combustion holes 110 are arranged in the X direction to form a combustion row 140;

the combustion plate 100 is further provided with anti-backfire holes 120, and the anti-backfire holes 120 are arranged along the X direction to form an anti-backfire row 130; the area of the combustion hole 110 is larger than that of the anti-backfire hole 120;

the number of the flashback preventing rows 130 and the combustion rows 140 is plural, and the two are staggered in the Y direction.

Specifically, in the present embodiment, the shape of the combustion plate 100 may be various, such as a square, a rectangle, a circle, an ellipse, a triangle, and other polygonal or irregular shapes, and corresponds to the shape of the fire outlet of the combustion chamber 310. The material of the combustion plate 100 may be various, such as ceramic, and metal, such as stainless steel. The thickness of the combustion plate 100 is 0.5 to 1.5mm, for example, 0.8mm or 1 mm. The thickness of the combustion plate 100 cannot be too thin, and after the plurality of combustion holes 110 are formed, the strength of the combustion plate 100 needs to be ensured; the thickness of the combustion plate 100 should not be too thick, which would increase the weight of the combustion plate 100 and increase the difficulty of processing while consuming materials. The length of the combustion hole 110 is 4 to 7mm, for example, 5mm, and the width is 0.6 to 0.8mm, for example, 0.7 mm. The shape of the flashback-preventing opening 120 can be varied, with a maximum radial dimension of 0.7-0.9 mm, for example 0.8 mm. The shape of the flashback-preventing opening 120 can be many, such as square, rectangular, circular, oval, triangular, and the like, with a circular shape being an example.

The combustion hole 110 is an elongated shape, and the specific shape thereof may be a rectangle, an elongated waist shape, or the like. The Y direction may be the longitudinal direction of the combustion plate 100, or may be the width direction of the combustion plate 100; correspondingly, the X direction may be the width direction of the combustion plate 100, or may be the longitudinal direction of the combustion plate 100. Of course, in some embodiments, the X-direction and the Y-direction may be disposed at an angle greater than 0 degrees and less than 90 degrees with respect to the length direction of the combustion plate 100.

In this embodiment, when the combustion plate 100 is in operation, the mixed gas is combusted through the combustion holes 110 and the anti-backfire holes 120, and during the combustion process, the mixed gas is mainly combusted in the combustion holes 110 due to the large area of the combustion rows 140 (composed of the combustion holes 110), and the amount of the mixed gas combusted in the anti-backfire rows 130 (composed of the anti-backfire holes 120) arranged around the combustion rows 140 is smaller than the amount of the mixed gas combusted in the combustion rows 140; when the combustion speed in the combustion hole 110 is higher than the injection speed and a backfire phenomenon (the combusted mixed gas flows back into the combustion chamber 310) is about to occur, the backfire tendency is blocked by the combusted gas injected in the backfire prevention hole 120, and the amount of the combusted gas injected in the backfire prevention hole 120 is larger than the amount of the backfire gas flow due to the position relationship between the backfire prevention hole 120 and the combustion hole 110, so that the occurrence of the backfire phenomenon can be effectively prevented, and the combustion stability (flame stabilization) of the mixed gas and the improvement of the combustion rate are ensured; meanwhile, the combustion row 140 with a large area is arranged, so that sufficient mixed gas can be provided for combustion when the combustion plate 100 is in high-power combustion, and the high-power combustion of the combustion plate 100 is ensured; by arranging the anti-backfire row 130 with a small area, the gas flow of combustion is further effectively prevented from flowing back into the combustion chamber 310 during low-power combustion; the combustion stability of the combustion plate 100 is further improved because the combustion holes 110 have a large area and are not easily blocked; in addition, the processing and manufacturing costs of the combustion plate 100 are far lower than those of the existing metal fiber mesh, so that the combustion plate 100 can ensure the stability and the high efficiency of high-power combustion and low-power combustion, and simultaneously, the cost of the combustion plate 100 is reduced.

In some embodiments, to further ensure the anti-backfire performance of the anti-backfire holes 120, the dimension d of the combustion holes in the X direction is 0.6 to 0.8 times the distance L1 between two adjacent combustion holes in the same combustion row 140. The distance between two adjacent fire holes of the same combustion row 140 cannot be too small, so that when the distance is too small, a backfire phenomenon may occur, and meanwhile, the strength of the combustion plate 100 cannot be guaranteed due to the too small distance; the pitch cannot be too large, and when it is too large, the total area of the combustion holes 110 cannot be secured, without using high-power combustion of the combustion plate 100.

The distance L2 between two adjacent burning rows 140 is 0.8-1.0 times of the Y-direction dimension D of the burning fire holes. The anti-backfire rows 130 are required to be arranged between the two combustion rows 140, the distance cannot be too small, and the arrangement of the anti-backfire rows 130 is not facilitated when the distance is too small, so that the strength of the combustion plate 100 is not ensured; the pitch cannot be too large, and when it is too large, the total area of the combustion holes 110 cannot be secured, without using high-power combustion of the combustion plate 100.

The distance L3 between the combustion row 140 and the flashback-preventing row 130 is 0.2 to 0.4 times the dimension D of the combustion hole 110 in the Y direction. The distance is not too small, and is not good for ensuring the strength of the combustion plate 100; the pitch cannot be too large, and when it is too large, the total area of the combustion holes 110 cannot be secured, and high-power combustion of the combustion plate 100 is not utilized, and at the same time, the discharge-and-backfire effect of the backfire preventing holes 120 is affected.

The area of the combustion hole 110 is 8-11 times of the area of the anti-backfire hole 120. Because the area of the anti-backfire hole 120 is smaller and the air pressure of the anti-backfire hole is the same as that of the combustion hole 110, the flow velocity of the airflow flowing out of the anti-backfire hole 120 is higher, and the anti-backfire is facilitated; in addition, the area of the anti-backfire hole 120 is very small, and the backfire phenomenon does not occur at the position of the anti-backfire hole 120. So set up, both can guarantee the high power combustion efficiency of burner plate 100, can effectually prevent the appearance of the phenomenon of tempering again.

In some embodiments, in order to further enhance the anti-backfire effect, the anti-backfire holes 120 are located at both ends of the combustion holes 110 in the Y direction, or correspond to the gaps between two adjacent combustion holes 110 of the same combustion row 140. The anti-backfire holes 120 may be disposed at both ends of the combustion holes 110 opposite to the combustion holes 110, i.e., in the extending direction of the combustion holes 110 in the length direction, and in some embodiments, may also be disposed at the end corresponding to the gap between two adjacent combustion holes 110. Because the distance between the adjacent combustion fire holes and the anti-backfire holes 120 is smaller, when the combustion fire holes have a backfire trend, the combustion mixed gas sprayed out of the anti-backfire holes 120 can block the pre-backfire airflow, and the occurrence of a backfire phenomenon is effectively prevented.

In some examples, to further improve the function of the anti-backfire holes 120, the anti-backfire rows 130 include a first sub-anti-backfire rows 131, the first sub-anti-backfire rows 131 include two rows of the anti-backfire holes 120 arranged in the X direction, and the first sub-anti-backfire rows 131 are disposed between two adjacent combustion rows 140. The arrangement of the flashback-preventing apertures 120 in rows can be varied, and can be arranged in two side-by-side rows as mentioned above, or can be arranged in three side-by-side rows, although in some embodiments they can be arranged in one row. By arranging at least two rows of anti-backfire holes 120 in the middle, at least one anti-backfire hole 120 is arranged at each of the two ends of each combustion hole 110 in the middle, so that the combustion holes 110 are simultaneously anti-backfire from the two ends of the combustion holes 110, and the anti-backfire reliability is improved.

The anti-backfire holes 120 comprise circular holes, and the distance between two rows of the anti-backfire holes 120 of the first sub-anti-backfire row 131 is 1.6-2.5 times of the radial dimension of the anti-backfire holes 120. The distance between the two rows of the anti-backfire holes 120 cannot be too large or too small, and when the distance is too large, the efficiency of the combined action of the two rows of the anti-backfire holes 120 is reduced, and the utilization rate of the combustion plate 100 is also greatly reduced; too small, the strength of the combustion plate 100 will not be guaranteed.

In some examples, to further improve the function of the anti-backfire holes 120, the anti-backfire rows 130 include a second sub-anti-backfire rows 132, the second sub-anti-backfire rows 132 include a row of the anti-backfire holes 120 arranged in the X direction, and the second sub-anti-backfire rows 132 are disposed at the edge of the combustion plate 100 in the Y direction. The plurality of rows of combustion holes 110 are arranged in a matrix of combustion holes 110, and a row of anti-backfire holes 120 are simultaneously arranged on both sides of the matrix of combustion holes 110 in the Y direction to prevent the burned mixture gas from backfiring from the outer ends of the combustion holes 110 (not adjacent to the combustion holes 110) on both sides in the Y direction. After the arrangement, at least one single anti-backfire hole 120 (at least two at least at two ends of the middle combustion hole 110 respectively) close to each other is arranged at each of the two ends of each combustion hole 110, so that the anti-backfire capability of the anti-backfire holes 120 is greatly improved, and the occurrence of the backfire phenomenon of the combustion holes 110 is prevented.

It is noted that, in some embodiments, in order to further increase the backfire preventing capability of the combustion plate 100, the specific anti-backfire rows 150 are disposed along the Y direction, and the specific anti-backfire rows 150 are disposed at both ends of the array of combustion holes 110, so as to further position the array of combustion holes 110 to cause the backfire phenomenon.

In some embodiments, to further achieve the effects of flashback resistance and flame holding, the fully premixed combustion assembly further comprises any one of a metal fiber mesh, a porous ceramic plate, and a metal wire mesh disposed on a surface of the combustion plate 100. The metal fiber net, the porous ceramic plate and the metal wire net all have micropores with smaller pore diameters, and at this time, even if the tempering-preventing holes 120 fail, the tempering phenomenon does not occur. Thereby further improving the stability of the combustion plate 100.

The invention further provides a full premix burner, which comprises a combustion shell 300 and a full premix combustion assembly, the specific structure of the full premix combustion assembly refers to the above embodiments, and the full premix burner adopts all technical solutions of all the above embodiments, so that the full premix burner at least has all the beneficial effects brought by the technical solutions of the above embodiments, and further description is omitted here. Wherein the combustion case 300 body has a combustion chamber 310; a fan 200, wherein the fan 200 is communicated with the air inlet of the combustion chamber 310; the burner plate 100 of the fully premixed burner assembly is disposed at the outlet of the combustion chamber 310. It is worth noting that in some embodiments, in order to further improve the combustion stability, a rectifying plate 400 is disposed in the combustion chamber 310, or in the gas mixing chamber, or between the gas mixing chamber and the combustion chamber 310, so as to make the gas flow more regular and orderly, which is beneficial to improving the combustion rate of the gas mixture. The fan 200 may be a forced drum or a forced extraction, and specifically, the fan 200 may be located at the gas and air inlet of the burner (forced drum) or above the combustion surface (forced extraction).

The invention further provides a gas water heater, which comprises a fully premixed burner, the specific structure of the fully premixed burner refers to the above embodiments, and the gas water heater adopts all the technical schemes of all the above embodiments, so that the gas water heater at least has all the beneficial effects brought by the technical schemes of the above embodiments, and further description is omitted.

In some embodiments, referring to fig. 8 to 12, the combustion assembly may include a plurality of combustion plates, which are illustrated as two blocks, and the combustion holes are formed in the two combustion plates, and the combustion holes are stacked and staggered by stacking the two combustion plates, so as to form a combustion gap 560 with a small size.

Specifically, a fully premixed combustion assembly, comprising at least:

the burner comprises a first combustion plate 500, wherein a first combustion hole 510 is formed in the first combustion plate 500;

the second combustion plate 600 is provided with a second combustion hole 610;

the first combustion plate 500 and the second combustion plate 600 are stacked and attached to each other, such that the first combustion holes 510 and the second combustion holes 610 are partially communicated with each other, and combustion gaps 560 are alternately formed, wherein the area of each combustion gap 560 is smaller than the area of each first combustion hole 510 and smaller than the area of each second combustion hole 610.

Specifically, in the present embodiment, the basic features of the first combustion plate 500 and the second combustion plate 600 may refer to the features of the above combustion plate 100, and the present embodiment is different in that the first combustion plate 500 and the second combustion plate 600 may not be provided with the tempering holes, and the shapes of the first combustion hole 510 and the second combustion hole 610 may not be limited. Specifically, the shape of the first combustion hole 510 is one or more of a rectangle, a square, a circle and a triangle, or is other polygonal or irregular shapes. The second combustion hole 610 has one or more of a rectangular shape, a square shape, a circular shape, and a triangular shape, or has another polygonal shape or a special shape. The shape of the first combustion hole 510 and the shape of the second combustion hole 610 may be different, the first combustion hole 510 may have a variety of different shapes, and the second combustion hole 610 may have a variety of different shapes, and of course, the combustion gap 560 formed by the first combustion hole 510 and the second combustion hole 610 being staggered may have a variety of different shapes.

After the first and

second combustion plates

500 and 600 are attached to each other, the first and second combustion holes 510 and 610 are formed in a vertically staggered manner such that the first and second combustion holes 510 and 610 are partially communicated with each other, thereby forming a narrow combustion gap 560 penetrating the first and

second combustion plates

500 and 600. The mixture may be combusted through the combustion gap 560, regardless of the shape of the combustion gap 560, and may be sized as desired. The first combustion plate 500 and the second combustion plate 600 are coupled in various manners, such as by screw fastening, snap fastening, riveting, and the like.

Specifically, the size of the combustion gap 560 can be adjusted according to different working condition requirements, and if the combustion gap 560 itself needs to be backfire-proof (backflow airflow cannot flow back to the combustion chamber from a narrow air outlet gap), the size of the combustion gap 560 needs to be adjusted to be smaller, such as 0.7-0.9 mm; if high-power operation is required, the length of the combustion gap 560 needs to be adjusted to be larger, such as 4-6 mm. In some embodiments, in order to obtain different combustion gaps 560, the same first combustion plate 500 and second combustion plate 600 need to have different mating positions for the first combustion plate 500 and second combustion plate 600. Different mounting positions and positioning portions may be provided on the first combustion plate 500 and/or the second combustion plate 600, so that the first combustion plate 500 and the second combustion plate 600 have a smaller first combustion gap 560 when they are coupled at the first fixing position; the first combustion plate 500 and the second combustion plate 600 have a larger second combustion gap 560 when coupled in the second fixed position. In this way, the flexibility of the first and

second combustion plates

500 and 600 may be improved.

In this embodiment, the first combustion holes 510 with a large area are formed in the first combustion plate 500, the second combustion holes 610 with a large area are formed in the second combustion plate 600, and then the first combustion plate 500 and the second combustion plate 600 are stacked, so that the first combustion holes 510 and the second combustion holes 610 are communicated in a staggered manner, and thus the combustion gap 560 with a small area is formed, which is beneficial to the sufficient combustion of the mixed gas, and when the combustion gap 560 is adjusted to a small size, the backfire can be prevented, and the combustion stability can be improved; the difficulty of processing the first combustion hole 510 and the second combustion hole 610 with larger areas is lower than that of processing the combustion gap 560 with smaller areas, so that the process is simple, and the cost of combustion by using the combustion gap 560 with small areas is reduced; in addition, realize burning gap 560 through stacking first combustion plate 500 and second combustion plate 600, compare in traditional veneer structure, still increased the degree of depth of burning gap 560, so make flame to the preheating reduction for burning gas mixture for the orderly slowing down of burning speed, the tempering trend slows down, the effectual appearance that prevents the tempering phenomenon.

Several specific cases of the first combustion plate 500 and the second combustion plate 600 will be described below.

The first combustion holes 510 are arranged in a strip shape, the length direction of the first combustion holes 510 is the Y direction, and the width direction of the first combustion holes 510 is the X direction; the plurality of combustion holes are arranged along the X direction to form a first combustion row; the plurality of second combustion holes 610 are arranged in the X direction to form a second combustion row, and the first combustion row and the second combustion row are stacked. In this way, a matrix of combustion gaps 560 may be formed, which may be beneficial in improving the combustion efficiency of the mixed gas.

In some embodiments, in order to improve the anti-backfire capability of the combustion, the first combustion plate 500 is further provided with a first anti-backfire hole, and the first anti-backfire hole is arranged adjacent to the first combustion hole 510; a second tempering-proof hole is further formed in the second combustion plate 600, and the second tempering-proof hole is arranged adjacent to the second combustion hole 610; the first anti-backfire holes and the second anti-backfire holes are partially communicated and staggered to form anti-backfire gaps, and the area of the combustion gap 560 is smaller than that of the first anti-backfire holes and smaller than that of the second anti-backfire holes; wherein the area of the first combustion hole 510 is greater than the area of the first flashback-preventing hole, and the area of the second combustion hole 610 is greater than the area of the second flashback-preventing hole. In the present embodiment, the shape (rectangle, square, circle, triangle, etc.), the structure (the combustion gap 560 and the anti-backfire gap), and the positional relationship (dimensional ratio relationship) and the size between the structures of the first combustion plate 500 and the second combustion plate 600 can be referred to the above embodiments of the combustion plates. Thus, compared to the above embodiments, the sizes of the first and second combustion holes 510 and 610 may be larger than those of the single plate embodiment (the length of the combustion hole is 4-7 mm, and the width thereof is 0.6-0.8 mm), so as to simplify the processing process and the processing difficulty. In the same way, compared with the above embodiment, the sizes of the first tempering-proof hole and the second tempering-proof hole may be larger than the size of the tempering-proof hole in the single plate embodiment (the radial size is 0.7-0.9 mm), so that the processing technology and the processing difficulty may be simplified.

In some embodiments, to improve the flashback resistance of the combustion assembly, a plurality of first flashback-preventing holes are arranged in the X-direction to form a first flashback-preventing row; the plurality of second anti-tempering holes are arranged along the X direction to form a second anti-tempering row; the first anti-backfire row and the second anti-backfire row are stacked. The number of the first anti-backfire rows and the first combustion rows is multiple, and the first anti-backfire rows and the first combustion rows are arranged in a staggered mode along the Y direction; the second anti-backfire row and the second combustion row are in a plurality, and are arranged in a staggered manner along the Y direction.

The invention also provides a manufacturing process of the full premix combustion assembly, which comprises the following steps:

s10, obtaining a first combustion plate 500 having first combustion holes 510;

s20, obtaining a second combustion plate 600 having second combustion holes 610;

s30, the first combustion plate 500 and the second combustion plate 600 are stacked and connected such that the first combustion holes 510 and the second combustion holes 610 are partially communicated and staggered to form combustion gaps 560, and the area of the combustion gaps 560 is smaller than the area of the first combustion holes 510 and smaller than the area of the second combustion holes 610.

Specifically, in the present embodiment, there are various ways to obtain the first combustion plate 500 having the first combustion holes 510, and the first base plate may be first cut into a plurality of first combustion plates 500 according to the required size according to the requirement of the burner, and then the first combustion holes 510 are punched on each first combustion plate 500. The different first combustion plates 500, especially the first combustion holes 510, can be obtained according to different requirements.

In another mode, a first substrate is obtained; blanking a first combustion hole 510 in the first base plate; the first substrate is divided to form a plurality of first combustion plates 500. That is, after obtaining a first base plate made of a single piece of stainless steel, the first combustion holes 510 are punched and then cut according to the size requirement of the first combustion plate 500. In this manner, the first combustion holes 510 are collectively punched, so that the production efficiency of the first combustion plate 500 can be greatly improved.

The first temper holes are punched two times, one before the first burner plate 500 is cut and the other after the first burner plate 500 is formed. Similarly, blanking before cutting to form the first combustion plate 500 is beneficial to meeting the difference requirement of the first anti-tempering hole rows, and improving the adaptability; blanking after the first combustion plate 500 is formed is advantageous to improve the processing efficiency of the first anti-backfire hole. Specifically, the method further comprises the following steps after the step of obtaining the stainless steel substrate: a first tempering-proof hole is punched in the base plate, and the area of the first tempering-proof hole is smaller than that of the first combustion hole 510.

It is noted that both the cutting of the second burner plate 600 and the blanking of the second burner holes 610 are required to match the first burner plate 500, and the step of obtaining the second burner plate 600 having the second burner holes 610 includes:

obtaining a second substrate; punching second combustion holes 610 on the second base plate according to the arrangement of the first combustion holes 510; the second substrate is divided into a plurality of second combustion plates 600 according to the shape of the first combustion plate 500. The step of punching the second combustion holes 610 on the second substrate according to the arrangement of the first combustion holes 510 specifically includes obtaining the shape, size and arrangement of the first combustion holes 510; then according to the shape and size requirements of the combustion gap 560; calculating the shape, size and arrangement of the second combustion holes 610 according to the requirement of the combustion gap 560 and the characteristics of the first combustion holes 510; the second burning hole 610 is then punched out according to the calculation result. In this way, the combustion gap 560 formed after the first combustion hole 510 and the second combustion hole 610 are stacked and communicated in a staggered manner can be ensured to meet the design requirement. Also, the shape and size of the second combustion plate 600 need to be tailored according to the shape and size of the first combustion plate 500 and the matrix requirements of the combustion gaps 560, so as to ensure that the number and coverage area (combustion area) of the formed combustion gaps 560 meet the design requirements.

Similarly, the blanking step of the second fire hole is the same as the blanking step of the second fire hole 610. The shape, size and arrangement of the first fire holes, and the target shape and size of the flashback-preventing gap need to be considered.

In other embodiments, in order to improve the adaptability of the combustion assembly, combustion gaps 560 with different shapes and sizes may be formed to meet the requirements of different working conditions, the first combustion plate 500 has a plurality of mounting positions, the second combustion plate 600 has fixing positions, and the fixing positions are selectively and fixedly connected with one mounting position; the step of stacking and connecting the first combustion plate 500 and the second combustion plate 600 specifically includes:

acquiring a preset value of a combustion gap 560;

according to the preset value, the fixing position selects the corresponding mounting position for fixing connection, so that the first combustion hole 510 and the second combustion hole 610 enclose to form a combustion gap 560 corresponding to the preset value.

That is, the first combustion plate 500 and the second combustion plate 600 have a plurality of different connection positions, so that the first combustion holes 510 and the second combustion holes 610 form different combustion gaps 560 (different in shape and/or size) corresponding to the different connection positions after being communicated in a staggered manner, so as to meet the requirements of different working conditions.

The full premix burner of the present invention includes a combustion casing and a full premix combustion assembly, and the specific structure of the full premix combustion assembly refers to the above embodiments (including the first combustion plate 500 and the second combustion plate 600), and since the full premix burner employs all the technical solutions of all the above embodiments, the full premix burner at least has all the beneficial effects brought by the technical solutions of the above embodiments, and no further description is provided herein. Wherein the combustion housing has a combustion chamber; the fan is communicated with the air inlet of the combustion chamber; and the combustion plate of the full-premixing combustion assembly is arranged at the air outlet of the combustion chamber.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A fully premixed combustion assembly comprising:

2. The fully premixed combustion assembly of claim 1, wherein the dimension of the combustion fire holes in the X direction is 0.6 to 0.8 times the distance between two adjacent combustion fire holes in the same combustion row.

3. The fully premixed combustion assembly of claim 1, wherein the distance between two adjacent combustion rows is 0.8 to 1.0 times the Y-direction dimension of the combustion fire holes.

4. The fully premixed combustion assembly of claim 1, wherein the distance between the combustion row and the flashback row is 0.2 to 0.4 times the Y-direction dimension of the combustion hole.

5. The fully premixed combustion assembly of claim 1, wherein the combustion holes have an area 8 to 11 times an area of the flashback-preventing holes.

6. The full premix combustion assembly as in claim 1, wherein the anti-backfire holes are formed at both ends of the combustion holes in the Y direction or correspond to gaps between two adjacent combustion holes of the same combustion row.

7. The fully premixed combustion assembly of claim 1, wherein the flashback preventing row includes a first sub-flashback preventing row including two rows of flashback preventing holes aligned in the X-direction, the first sub-flashback preventing row being disposed between two adjacent combustion rows.

8. The fully premixed combustion assembly of claim 7, wherein the flashback-preventing holes comprise circular holes, and a distance between two rows of the flashback-preventing holes of the first sub-flashback row is 1.6 to 2.5 times a radial dimension of the flashback-preventing holes.

9. The fully premixed combustion assembly of claim 7, wherein the flashback preventing row includes a second sub-flashback preventing row including a row of flashback preventing holes aligned in the X-direction, the second sub-flashback preventing row being disposed at an edge of the combustion plate in the Y-direction.

10. The fully premixed combustion assembly of any one of claims 1 to 9, wherein the combustion plate is made of a stainless steel material, and a thickness of the combustion plate is 0.5 to 1.5 mm.

11. A fully premixed combustor characterized by comprising:

a combustion housing having a combustion chamber;

the fan is communicated with the air inlet of the combustion chamber;

the fully premixed combustion assembly as claimed in any one of claims 1 to 10, wherein the burner plate of the fully premixed combustion assembly is disposed at the outlet of the combustion chamber.

12. A gas water heater, comprising: the fully premixed combustion assembly of any one of claims 1-10; or,

the fully premixed combustor of claim 11.