CN118224594A - Fire row, combustor and gas heating equipment - Google Patents

Abstract

The invention belongs to the technical field of combustion, and particularly discloses a fire grate, a burner and gas heating equipment. The fire row comprises an inner shell, an outer shell and an inner core. The inner shell comprises two inner shell parts, the upper end of the inner shell part is provided with a vertically arranged rectifying plate part, and the upper end of the rectifying plate part is outwards folded to form a fire plate part; the inner core is vertically inserted into the first premixing cavity and divides the first premixing cavity into at least two first flow passages, and each first flow passage is positioned between one rectifying plate part and the outer side wall of the inner core; the outer shell is sleeved on the outer side of the inner shell and is respectively surrounded with the two inner shells to form a second premixing cavity, a second fire hole is formed between the outer end of the fire plate part and the inner wall of the outer shell, and the second fire hole is communicated with the upper end of the second premixing cavity. The fire grate, the burner and the gas heating equipment disclosed by the invention can simplify the structure of the fire grate while improving the combustion stability, and reduce the processing difficulty of the fire grate, thereby reducing the cost of the burner and the gas heating equipment.

Description

Fire row, combustor and gas heating equipment

Technical Field

The invention relates to the technical field of combustion, in particular to a fire grate, a burner and gas heating equipment.

Background

The burner is a core component of gas heating equipment such as a gas water heater, a gas wall-mounted furnace and the like, and combustion characteristics such as combustion sufficiency, stability and the like play a vital role in the performance of the whole gas heating equipment.

The existing burner applied to the gas heating apparatus is generally a row-shaped burner including a plurality of fire rows arranged side by side. In order to reduce harmful substances generated by combustion, as shown in fig. 1, the prior art provides a low nitrogen burner fire grate including an inner case 100, outer cases 200 disposed at opposite sides of the inner case 100, and an inner core 300 disposed inside the inner case 100, a thick flame path 400 is formed between the inner case 100 and the outer case 200, and a thin flame path 110 is formed inside the inner case 100; the thick flame channel 400 is communicated with a thick gas injection channel of the fire grate, and a thick fire hole is formed at the top end of the thick flame channel; the flame path 110 communicates with the flame discharge flame injection path, and the inner core 300 includes a plurality of plate monoliths 320 disposed opposite to and spaced apart from each other, the plurality of plate monoliths 320 dividing the upper portion of the flame path 110 into a plurality of sub-runners 310, and upper ports of each sub-runner 310 forming flame holes.

The low-nitrogen burner fire row provided in the prior art can utilize the thick and thin combustion principle to reduce the generation of nitrogen oxides and reduce the pollution of combustion gas by arranging the thin fire holes and the thick fire holes positioned at two sides of the thin fire holes, and can realize the rectification of the premixed gas flowing through the thin flame channel 110 by arranging a plurality of plate singlechips 320 to divide the thin flame channel 110 into a plurality of sub-runners 310. However, in the low-nitrogen burner fire row provided in the prior art, since the inner core 300 is required to be separated to form a plurality of sub-runners 310 and is also required to be matched with the inner shell 100 to form the blind holes 500 for separating the light fire holes and the thick fire holes, the inner core 300 is required to be formed by stamping and bending a plurality of single plates 320, so that the inner core 300 is complex to process and the processing cost is high; and the two plate monoliths 320 positioned at the outermost sides need to be matched with the inner case 100 to form the blind hole 500 structure, so that the assembly difficulty of the inner case 100 and the inner core 300 is increased, resulting in an increase in the complexity of the fire grate structure and the processing cost.

Disclosure of Invention

One of the technical problems to be solved by the invention is to provide a fire grate, which can effectively solve the problems that the inner core structure is complex and the assembly difficulty of the inner core and the inner shell is increased due to the fact that the inner core and the inner shell are matched to form a blind hole for separating a light fire hole and a dense fire hole in the existing fire grate, simplify the structure of the fire grate, and reduce the processing and assembly difficulty of the fire grate.

The second technical problem to be solved by the invention is to provide the burner which can effectively solve the problems of complex structure and high cost of the burner caused by complex fire row structure and high cost of the existing burner, and reduce the cost of the burner while ensuring the combustion stability of the burner.

The third technical problem to be solved by the invention is to provide the gas heating equipment, which can effectively solve the problems of the prior gas heating equipment that the structure complexity of the gas heating equipment is increased and the cost is high due to the complex structure of the burner and the high cost, and reduce the cost of the gas heating equipment while ensuring the operation stability of the gas heating equipment.

The first technical problem is solved by the following technical scheme:

A fire grate, comprising:

The inner shell comprises two inner shell parts which are oppositely arranged along a first direction, an injection channel and a first premixing cavity are formed around the two inner shell parts, the upper opening of the first premixing cavity is arranged, the lower end of the first premixing cavity is communicated with the first injection channel, the upper end of the inner shell part forms a vertically arranged rectifying plate part, and the upper end of the rectifying plate part is outwards folded to form a fire plate part;

the inner core is vertically inserted into the first premixing cavity and divides the first premixing cavity into at least two first flow channels, each first flow channel is positioned between one rectifying plate part and the outer side wall of the inner core, and a first fire hole is formed at the upper port of each first flow channel;

the outer shell is sleeved on the outer side of the inner shell and is respectively surrounded with the two inner shells to form a second premixing cavity, the second premixing cavity is communicated with the injection channel, the air-fuel ratio of mixed gas in the first premixing cavity is different from that of the mixed gas in the second premixing cavity, a second fire hole is formed between the outer end of the fire plate part and the inner wall of the outer shell, and the second fire hole is communicated with the upper end of the second premixing cavity.

Compared with the background technology, the fire grate has the beneficial effects that: because the air-fuel ratio of the mixed gas in the first premixing cavity and the second premixing cavity is different, one of the first flame hole and the second flame hole is a light flame hole, and the other is a thick flame hole, so that in the combustion process, the flame at the light flame hole can be burnt under excessive air to reduce the temperature, the flame at the thick flame hole can be incompletely burnt under the anoxic condition to reduce the temperature of the thick flame, the temperature during combustion of a fire bar is further reduced, the generation of nitrogen oxide in the combustion process is reduced, the emission of pollutants is reduced, the fuel which is not fully burnt in the thick flame hole can be further burnt with the excessive air at the light flame hole, the combustion sufficiency of the fire bar is ensured, the emission of CO is reduced, and the utilization rate of fuel gas is improved; meanwhile, an inner core is inserted into the first premixing cavity, so that the inner core can form two first runners which are arranged side by side in the first direction on the upper part of the first premixing cavity, the inner core can rectify the premixed gas of fuel gas and air in the first premixing cavity, partial premixed gas can flow out of the first fire holes upwards through the two first runners respectively, the speed of the premixed gas flowing out of the first premixing cavity is slowed down, the phenomenon of flame release at the first fire holes is avoided, and the combustion stability and reliability of a fire row are improved; the fire plate part is formed by outwards turning over each inner shell part, and a second fire hole is formed between the fire plate part and the inner wall of the outer shell, so that the fire plate part can separate the first fire hole from the second fire hole, a structure for separating the first fire hole from the second fire hole is not required to be formed by matching the inner core with the inner shell, the structure of the inner core can be simplified, meanwhile, the assembly structure between the inner core and the inner shell is simplified, and the processing difficulty of a fire row is further reduced; meanwhile, a vertical rectifying plate part is formed at the upper end of the inner shell part, a first flow passage is formed between the rectifying plate part and the inner core, so that the rectifying effect on premixed gas in the first premixing cavity is realized through the rectifying plate part and the inner core, the premixed gas can flow out of the first flow passage vertically upwards, flame at the first fire hole can be ensured to burn vertically upwards, interference between the first fire holes or between the first fire holes and the second fire holes is avoided, local high temperature is effectively avoided, the combustion stability is improved, and the generation of nitrogen oxides is further reduced; furthermore, the fire plate part is formed by folding the top end of the rectifying plate part, so that the processing of the fire plate part is facilitated, the control of the size of the fire plate part is facilitated, the processing precision of the first fire hole is improved, and the combustion stability is further improved.

In one embodiment, the inner core includes two core plate portions opposite to each other in the first direction and spaced apart from each other, a central flow passage vertically penetrating is formed between the two core plate portions, a third fire hole is formed at an upper port of the central flow passage, and the first flow passage is formed between an outer side of each core plate portion and an adjacent rectifying plate portion.

In one embodiment, the width of the central flow channel in the first direction is smaller than the width of the first flow channel in the first direction.

In one embodiment, the width of the first flow channel in the first direction is L ₁, and the width of the central flow channel in the first direction is L ₂,L₁：L₂ =1.2 to 1.5;

and/or the width of the first flow channel is 0.7 mm-2 mm;

And/or the width of the central flow channel is 0.5 mm-1.5 mm.

In one embodiment, the outer end of the fire plate part is turned down to form a rectifying flanging part, a second flow passage is formed between the rectifying flanging part and the outer shell, the upper port of the second flow passage forms the second fire hole, and the lower end of the second flow passage is communicated with the second premixing cavity;

and/or the fire plate part is outwards extended to form an abutting part, and the abutting part is abutted with the inner side wall of the outer shell.

In one embodiment, the rectifying flanging portions and the abutting portions are staggered in a second direction, and the second direction is perpendicular to the first direction.

In one embodiment, an outer shell profiling is convexly arranged on the inner wall of the outer shell along the direction facing the second premixing cavity, and the outer shell profiling is opposite to the rectifying plate part and is arranged at intervals.

In one embodiment, the upper end of the shell profiling is opposite to the lower end of the rectifying flanging part, so that the lower end of the second flow channel is narrowed relative to the upper end of the second flow channel;

and/or the height of the shell profiling along the vertical direction is H, the height of the rectifying plate part along the vertical direction is H, and h=0.6-0.9H;

And/or the height of the outer shell profiling protruding relative to the outer side wall of the outer shell is d, and the width of the second flow channel in the first direction is L ₃,d=0.5L₃~0.8L₃.

In one embodiment, the height of the inner core along the vertical direction is 12 mm-20 mm; and/or, the height of the rectifying plate part along the vertical direction is 4 mm-10 mm.

In one embodiment, the upper ends of the two core plate parts are pressed and provided with split-flow pressing patterns along the direction facing each other, the split-flow pressing patterns oppositely arranged in the first direction are abutted, and a plurality of split-flow pressing patterns are arranged at intervals along a second direction, and the second direction is the length direction of the inner shell;

And/or rectifying profiling is pressed on the two core plate parts along the direction facing each other, the rectifying profiling is arranged at intervals with the upper end and the lower end of the core plate part, and the rectifying profiling arranged oppositely in the first direction is abutted.

In one embodiment, the plurality of rectifying press forms on each core plate portion are divided into a first press form and a second press form, the plurality of first press forms are arranged on the lower side of the split press form in a one-to-one correspondence manner, and the first press forms and the second press forms are arranged at staggered intervals in the second direction.

In one embodiment, the injection channel comprises a first injection channel and a second injection channel which are arranged separately, the lower end of the first premixing cavity is communicated with the first injection channel, the second premixing cavity is communicated with the second injection channel, and the first injection channel and the second injection channel inject mixed gas with different air-fuel ratios.

The second technical problem is solved by the following technical scheme:

a burner comprising a fire grate in any of the embodiments described above.

Compared with the background technology, the burner has the beneficial effects that: through adopting above-mentioned fire row, can improve the burning sufficiency and the stability of combustor, reduce the nitrogen oxide that produces in the combustion process, and can simplify the structure of combustor, reduce the processing cost of combustor.

The third technical problem is solved by the following technical scheme:

A gas heating device comprises the burner.

Compared with the background technology, the gas heating equipment has the following beneficial effects: according to the gas heating equipment provided by the invention, by adopting the burner, the operation stability and reliability of the gas heating equipment can be improved, the harmful gas generated during the operation of the gas heating equipment can be reduced, and the cost of the gas heating equipment can be reduced.

Drawings

FIG. 1 is a schematic cross-sectional view of a low nitrogen burner fire grate in accordance with the prior art;

FIG. 2 is a schematic view of a fire grate according to an embodiment of the present invention;

FIG. 3 is an enlarged view of the portion I of FIG. 2;

fig. 4 is a schematic structural view of an inner housing according to an embodiment of the present invention;

FIG. 5 is a cross-sectional view of a fire grate provided in an embodiment of the present invention;

FIG. 6 is an enlarged view at J in FIG. 5;

FIG. 7 is a partial cross-sectional view of a fire grate provided in an embodiment of the invention;

fig. 8 is a schematic structural diagram of an inner core according to an embodiment of the present invention.

Description of the reference numerals:

100. an inner case; 110. a light flame path; 200. a housing; 300. an inner core; 310. a sub-runner; 320. a single sheet of sheet material; 400. a thick flame path; 500. a blind hole;

1. An inner housing; 11. an inner shell portion; 111. a rectifying plate portion; 12. a flame plate portion; 13. a rectifying flanging part; 14. an abutting portion; 15. a first premix chamber; 16. an injection channel; 16a, a first injection channel; 16b, a second injection channel; 17. a vent hole;

2. An outer housing; 21. a housing main section; 22. profiling the shell; 23. a connecting bridge portion; 24. positioning the convex hull;

3. An inner core; 31. a core plate portion; 32. split-flow profiling; 33. rectifying and profiling; 33a, a first profiling; 33b, second profiling; 34. a central flow passage; 35. an end connection portion;

101. A second premix chamber; 102. a first flow passage; 103. and a second flow passage.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

In the description of the present application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.

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 implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.

The embodiment provides a fire grate, which can be applied to a combustor, and can improve the sufficiency and stability of combustion through a thick-thin combustion principle, reduce the generation of nitrogen oxides in the combustion process, simplify the structure of the fire grate, and reduce the processing difficulty of the fire grate.

Specifically, as shown in fig. 2 to 5, the present embodiment provides a fire grate including an inner case 1, an outer case 2, and an inner core 3. The inner shell 1 comprises two inner shell parts 11 which are oppositely arranged along a first direction, an injection channel 16 and a first premixing cavity 15 are formed by surrounding the two inner shell parts 11, the upper opening of the first premixing cavity 15 is arranged, the lower end of the first premixing cavity is communicated with the injection channel 16, a vertically arranged rectifying plate part 111 is formed at the upper end of the inner shell part 11, and the upper end of the rectifying plate part 111 is outwards folded to form a fire plate part 12; the inner core 3 is vertically inserted into the first premixing cavity 15 and divides the first premixing cavity 15 into at least two first flow passages 102, each first flow passage 102 is positioned between a rectifying plate part 111 and the outer side wall of the inner core 3, and the upper port of the first flow passage 102 forms a first fire hole; the outer shell 2 is sleeved on the outer side of the inner shell 1 and is respectively surrounded with the two inner shell parts 11 to form a second premixing cavity 101, the second premixing cavity 101 is communicated with the injection channel 16, the air-fuel ratio of mixed gas in the first premixing cavity 15 and the air-fuel ratio of mixed gas in the second premixing cavity 101 are different, a second fire hole is formed between the outer end of the fire plate part 12 and the inner wall of the outer shell 2, and the second fire hole is communicated with the upper end of the second premixing cavity 101.

According to the fire grate provided by the embodiment, the inner core 3 is inserted into the first premixing cavity 15, so that the inner core 3 can form the upper part of the first premixing cavity 15 into two first runners 102 which are arranged side by side in the first direction, and therefore the inner core 3 can rectify the premixed gas of the fuel gas and the air in the first premixing cavity 15, so that part of the premixed gas can flow out of the first fire holes upwards through the two first runners 102 respectively, the speed of the premixed gas flowing out of the first premixing cavity 15 is slowed down, the phenomenon that flame at the first fire holes is released is avoided, and the combustion stability and reliability of the fire grate are improved; the fire plate part 12 is formed by outwards turning each inner shell part 11, and a second fire hole is formed between the fire plate part 12 and the inner wall of the outer shell 2, so that the fire plate part 12 can separate the first fire hole from the second fire hole, a structure for separating the first fire hole from the second fire hole is not required to be formed by matching the inner core 3 with the inner shell 1, the structure of the inner core 3 can be simplified, meanwhile, the assembly structure between the inner core 3 and the inner shell 1 is simplified, and the processing difficulty of a fire row is further reduced; meanwhile, by forming the vertical rectifying plate part 111 at the upper end of the inner shell part 11, the first flow channel 102 is formed between the rectifying plate part 111 and the inner core 3, so that the rectifying effect on the premixed gas in the first premixing cavity 15 is realized through the rectifying plate part 111 and the inner core 3, the premixed gas is ensured to flow out of the first flow channel 102 vertically upwards, the flame at the first flame holes can be ensured to burn vertically upwards, the interference between the first flame holes or between the first flame holes and the second flame holes is avoided, the generation of local high temperature is effectively avoided, the combustion stability is improved, and the generation of nitrogen oxides is further reduced; furthermore, the fire plate part 12 is formed by turning the top end of the rectifying plate part 111, so that the processing of the fire plate part 12 is facilitated, the size of the fire plate part 12 is controlled, the processing precision of the first fire hole is improved, and the combustion stability is further improved; finally, because the air-fuel ratio of the mixed gas in the first premixing cavity 15 and the air-fuel ratio of the mixed gas in the second premixing cavity 101 are different, one of the first flame holes and the second flame holes is a light flame hole, and the other flame hole is a thick flame hole, so that the temperature of the fire grate during combustion can be reduced, the production of nitrogen oxides in the combustion process can be reduced, the emission of pollutants can be reduced, and the combustion sufficiency of the fire grate can be ensured.

It is worth to say that one of the first fire hole and the second fire hole is a light flame hole, and the other is a thick flame hole, so that the thick and thin combustion of the fire row is realized. Lean combustion requires a larger amount of air, and rich combustion requires a relatively smaller amount of air, i.e., the air-fuel ratio of the mixture in the lean holes is greater than the air-fuel ratio of the mixture in the rich holes. Therefore, the light flame burns under the excessive air, the temperature of the light flame is reduced by being wrapped by the excessive air, and the thick flame is incompletely burnt under the anoxic condition, so that the temperature of the thick flame is reduced, the flame temperature is reduced as a whole, and the generation of nitrogen oxides is reduced; meanwhile, as the two second flame holes are positioned on two sides of the first flame hole, fuel which is not fully combusted in the thick flame can be further combusted with excessive air in the thin flame, so that the fuel is fully combusted, CO emission is reduced, and the utilization rate of fuel gas is improved.

In one embodiment, the first flame holes are light flame holes and the second flame holes are thick flame holes. In other embodiments, the first flame holes may be thick flame holes, and the second flame holes may be thin flame holes. In other embodiments, the fire grate may not be provided with the outer casing 2.

In one embodiment, the injection passage 16 includes a first injection passage 16a and a second injection passage 16b, and the first injection passage 16a and the second injection passage 16b are respectively formed with injection ports on the same side of the fire grate. The lower end of the first premixing chamber 15 is communicated with the first injection channel 16a, and the lower end of the second premixing chamber 101 is communicated with the second injection channel 16 b. The air-fuel ratio of the mixed gas formed by the injection of the first injection passage 16a and the second injection passage 16b is different. By arranging the first injection channel 16a and the second injection channel 16b respectively, the fuel gas quantity entering the first injection channel 16a and the second injection channel 16b is controlled, the air-fuel ratio in the first premixing cavity 15 and the second premixing cavity 101 is controlled, and the flexibility of air-fuel ratio regulation is improved.

In other embodiments, the inner housing 1 may be provided with only one injection channel 16, that is, the lower ends of the first premix chamber 15 and the second premix chamber 101 are communicated with the same injection channel 16, the outer side wall of the outer housing 2 is provided with air holes, and the air holes are communicated with the corresponding second premix chamber 101, so that external air can enter the second premix chamber 101 through the air holes, so as to mix with the mixed gas entering the second premix chamber 101, and the air quantity of the mixed gas in the second premix chamber 101 is increased, so that the air and the gas of the mixed gas in the second premix chamber 101 and the first premix chamber 15 are different.

It can be understood that the prior art realizes a plurality of different arrangements of the air-fuel ratios in the first premix chamber 15 and the second premix chamber 101, and the present invention is not limited to this and will not be repeated.

For convenience of description, the width direction of the fire row is defined as a first direction, the length direction is defined as a second direction, the first direction is perpendicular to the second direction, and the first direction and the second direction are perpendicular to the vertical direction.

The outer housing 2 comprises two outer housing main parts 21 oppositely arranged in the first direction, the two outer housing main parts 21 being located outside the two inner housing parts 11, respectively, each outer housing main part 21 forming a second premix chamber 101 with the adjacent inner housing parts 11. The second injection channel 16b is provided with a plurality of vent holes 17 along two channel walls in the first direction, and the second injection channel 16b is communicated with the two second premixing cavities 101 through the vent holes 17 on two sides.

The two ends of the two inner housing portions 11 in the second direction are press-fitted and sandwiched between the corresponding ends of the two outer housing main portions 21. It should be noted that, the manner and specific structure of the first injection channel 16a, the second injection channel 16b, and the first premixing cavity 15 formed by surrounding the two inner housing portions 11 may be set with reference to the prior art, and the connection between the outer housing 2 and the inner housing 1 may be set with reference to the prior art, which is not the focus of the present invention and will not be repeated here.

As shown in fig. 4 to 6, in an embodiment, the outer end of the flame plate portion 12 is turned down to form a rectifying flange portion 13, a second flow passage 103 is formed between the rectifying flange portion 13 and the outer casing 2, a second flame hole is formed at an upper port of the second flow passage 103, and a lower end of the second flow passage 103 is communicated with the second premixing chamber 101. By arranging the rectifying flanging part 13, a blind hole structure which is opened downwards is formed by surrounding the fire plate part 12, the rectifying flanging part 13 and the rectifying plate part 111, and the blind hole structure is positioned between the first fire hole and the second fire hole, so that the distance between the first fire hole and the second fire hole can be increased, the blocking and shunting effect of the first flow channel 102 and the second flow channel 103 is improved, and the flame combustion stability of the first fire hole and the second fire hole is ensured; meanwhile, the arrangement of the rectifying flanging part 13 is beneficial to increasing the length of the second flow channel 103 in the vertical direction, so that the flame at the second fire hole is guided to vertically upwards, divergence is avoided, interference between the flame at the second fire hole and the flame at the first fire hole is reduced, local high temperature is reduced, and generation of nitrogen oxides is further reduced; furthermore, the fire plate part 12 is downwards folded to form the rectifying flanging part 13, so that the processing precision of the rectifying flanging part 13 is controlled, the processing precision of the second flow passage 103 is ensured, and the flame combustion stability is further improved.

The width L ₃ of the second flow path 103 in the first direction is preferably 0.8mm to 1.2mm. The height of the rectifying and flanging part 13 along the vertical direction is preferably 1.5 mm-3 mm, so that the rectifying and flanging part 13 rectifies premixed gas flowing to the second fire hole, and meanwhile, the structural cost is prevented from being increased due to the fact that the rectifying and flanging part 13 is overlong. The width of the fire deck portion 12 in the first direction is preferably 2mm to 3mm to ensure that the fire deck has sufficient width to separate the first and second fire holes, while also avoiding an increase in the size of the fire row in the first direction due to an excessive width of the fire deck.

In one embodiment, the flame plate portion 12 extends outward with an abutment portion 14, and an outer end of the abutment portion 14 abuts against an inner side wall of the outer case 2. By the abutting of the abutting portion 14 and the inner side wall of the outer casing 2, the upper end of the outer casing 2 is prevented from sinking inwards, the flatness of the upper end of the outer casing 2 is ensured, and therefore the plane precision of the second flow passage 103 is better ensured.

The abutting parts 14 and the rectifying flanging parts 13 are staggered in the second direction so as to simplify the processing of the inner shell 1 and better ensure the overall structural strength of the inner shell 1; meanwhile, the arrangement of the abutting part 14 and the staggered arrangement of the rectifying flanging part 13 separate the upper end opening of the second flow channel 103 into a plurality of second fire holes which are arranged at intervals in the second direction, so that the grouping combustion of flames at the second flow channel 103 is facilitated, the heat dissipation area of the flames at the second fire holes is increased, and the flame combustion temperature is reduced.

In an embodiment, a connecting bridge portion 23 is connected between the top ends of the two main shell portions 21, a plurality of connecting bridge portions 23 are arranged at intervals along the second direction, and the connecting bridge portion 23 is located above the inner shell 1 and the inner core 3, so that the outer shell 2 is connected to form a whole structure. Each connecting bridge 23 is located right above one abutting part 14, so that flames corresponding to the second flow passages 103 are separated only through the abutting parts 14, and separation is not needed through the connecting bridge 23, and uniformity of flame separation at the second flow passages 103 is improved.

Further, the connecting bridge portion 23 is formed by folding the housing main portion 21, the upper end surfaces of the abutting portion 14 and the fire plate portion 12 are abutted with the lower side surface of the connecting bridge portion 23, and the abutting portion 14 abuts against the root portion of the connecting bridge portion 23, so that the two housing main portions 21 are prevented from sinking at the bending positions of the connecting bridge portion 23 and the housing main portion 21 due to the fact that the connecting bridge portion 23 is pulled, and assembly accuracy of the outer shell 2 and the inner shell 1 is guaranteed.

The abutting portion 14 is preferably in a trapezoid structure, the small end of the trapezoid structure abuts against the inner side wall of the outer shell 2, the abutting portion 14 is structurally arranged, the overall structural strength of the abutting portion 14 can be increased while the small end size of the abutting portion 14 is matched with the width of the connecting bridge portion 23, the deformation probability of the abutting portion 14 is reduced, and the structural stability of the fire row is improved.

As shown in fig. 6 and 7, since the width of the second premix chamber 101 in the first direction is larger than the width of the second flow channel 103, and a blind hole structure for blocking the flow of the premix gas is provided on one side of the second flow channel 103, the flow speed of the premix gas flowing into the second flow channel 103 through the second premix chamber 101 is slower, and a backfire phenomenon may occur, and in order to avoid the backfire problem at the second fire hole, in an embodiment, the inner wall of the outer shell 2 is convexly provided with the outer shell profiling 22 along the direction towards the second premix chamber 101, and the outer shell profiling 22 is opposite to and spaced from the rectifying plate 111. By arranging the shell profiling 22, the flow channel width of the second premix chamber 101 between the rectifying plate part 111 and the shell profiling 22 can be reduced, so that the speed of the premix gas flowing from the second premix chamber 101 to the second flow channel 103 is increased, and the problem that flame at the second flame hole generates backfire is avoided; meanwhile, the arrangement of the shell profiling 22 is beneficial to enhancing the overall structural strength of the shell body 2, reducing the probability of deformation of the shell body 2 and improving the structural stability of the fire grate.

In an embodiment, the upper end of the shell profiling 22 is arranged opposite to the lower end of the second runner 103 so that the lower end of the second runner 103 is narrowed relative to the upper end, thereby being capable of further increasing the speed of the premixed gas flowing from the second premixing cavity 101 to the second runner 103 and ensuring the stability of flame combustion at the second flame holes.

The height of the shell profiling 22 in the vertical direction is H, the height of the rectifying plate portion 111 in the vertical direction is H, h=0.6h-0.9h, and therefore the range of action of the shell profiling 22 on the second premixing cavity 101 can be increased, flow of premixed gas flowing out of the narrowed region is stable, and the air outlet stability of the second fire hole is improved.

The height of the outer shell profiling 22 protruding out of the outer side wall of the outer shell 2 is d, and the width of the second flow channel 103 in the first direction is L ₃,d/L₃ = 0.5-0.8, so that the width of the lower end opening of the second flow channel 103 is proper, the situation that flame is separated due to too small lower end opening of the second flow channel 103 is avoided, and the situation that the lower end opening of the second flow channel 103 is larger and tempering is avoided.

The shell profiling 22 includes profiling bottom and profiling lateral part, profiling bottom and rectification board portion 111 parallel and the interval sets up, profiling lateral part encircles profiling bottom and smooth connection in between profiling bottom and the shell main part 21, and profiling lateral part is the circular arc structure to do benefit to the structure that realizes shell profiling 22. It should be noted that the height between the outer side walls of the outer shell 2 protruding from the outer shell profiling 22 is the distance between the inner side surface of the profiling bottom and the outer side surface of the outer shell main part 21; the height of the housing profiling 22 in the vertical direction is the height of the profiling bottom in the vertical direction.

In an embodiment, the shell profiling 22 extends in the second direction to increase the coverage of the individual shell profiling 22 in the second direction, thereby better ensuring the uniformity of the rectification of the premix gas in the second premix chamber 101 by the shell profiling 22 in the second direction. In an embodiment, two shell profiling 22 are arranged at intervals along the second direction, and the ratio of the length of each shell profiling 22 along the second direction to the length of the fire row along the second direction is 0.3-0.45, so that the processing convenience of the shell profiling 22 is ensured while the coverage area of a single shell profiling 22 along the second direction is increased.

Further, each main housing portion 21 is formed with a positioning convex hull 24 by outward punching, and the positioning convex hulls 24 are used for being abutted with the positioning convex hulls 24 of adjacent fire rows when a plurality of fire rows are assembled, so that the assembly and positioning of the fire rows are realized, and the stability of the space between the main body structures of the two fire rows is ensured. The positioning projection 24 is located between the two housing profiles 22.

As shown in fig. 7, in an embodiment, the height of the inner core 3 in the vertical direction is greater than the height of the rectifying plate portion 111 in the vertical direction, so that the length of the vertically arranged portion of the first flow channel 102 is the same as the length of the rectifying plate portion 111, the rectifying effect of the premixed gas flowing through the first flow channel 102 is improved, the premixed gas flowing out of the first fire hole is ensured to flow upwards, and the flame at the first fire hole is ensured to burn vertically.

The height of the rectifying plate portion 111 in the vertical direction is 4 mm-10 mm, and the height of the inner core 3 in the vertical direction is 12 mm-20 mm.

As shown in fig. 7 and 8, in an embodiment, the core 3 includes two core plate portions 31 disposed opposite to each other in the first direction, a central flow passage 34 is formed between the two core plate portions 31, a first flow passage 102 is formed between each core plate portion 31 and the adjacent core plate portion 11, and a third flame hole is formed at an upper port of the central flow passage 34. By arranging the central flow passage 34 in the inner core 3, the premixed gas flowing out of the first premixed cavity 15 can be further rectified, and the combustion stability is further improved; meanwhile, the two core plate parts 31 are surrounded to form the vertical central flow passage 34, so that the shapes of the first flow passage 102 and the second flow passage 103 are controlled, the premixed gas can flow out of the fire row vertically upwards, flame divergence is avoided, flame interference at two adjacent fire holes is reduced, local high temperature is avoided, and the generation of nitrogen oxides is further reduced; furthermore, since the inner core 3 includes the two core plate portions 31, the structure of the inner core 3 is effectively simplified while the rectifying effect of the premixed gas of the first premixing chamber 15 is achieved, the processing difficulty of the inner core 3 is reduced, and the processing reliability of the inner core 3 can be better ensured, so that the structure of the fire row is simplified and the cost of the fire row is reduced while the performance of the fire row is improved.

As shown in fig. 3 and 8, in the present embodiment, the two core plate portions 31 are press-fit-connected or bent-connected at both ends in the second direction to form end connection portions 35, and the two end connection portions 35 are sandwiched between the corresponding ends of the two inner shell portions 11, that is, the two ends of the inner core 3 in the second direction are sandwiched between the corresponding ends of the two inner shell portions 11. That is, the inner core 3 is formed by punching and bending two single sheets of plates, has a simple structure and good processing convenience, and is more beneficial to ensuring the shape accuracy of the central flow channel 34 and the two first flow channels 102 on the outer side of the inner core 3.

As shown in fig. 7, in an embodiment, the width of the first flow channel 102 in the first direction is L ₁, and the width of the central flow channel 34 in the first direction is L ₂,L₂＜L₁, so that the flow rate of the premixed gas of the first flow channels 102 on both sides is lower than that of the premixed gas of the central flow channel 34, and the speed of the premixed gas flowing out of the first flow channel 102 is reduced, so that the probability of flame off of the first fire hole is reduced.

In an embodiment, the width of the first flow channel 102 in the first direction is 0.7mm to 2.0mm, so as to avoid the fire escape caused by too small width of the first flow channel 102 and avoid the larger size of the fire row in the first direction caused by too large width of the first fire hole. The width of the central flow channel 34 is 0.5mm to 1.5mm. In one embodiment, L ₁/L₂ =1.2 to 1.5.

In one embodiment, the upper ends of the two core plate portions 31 are press-formed with the split-flow press-forming patterns 32 in the direction toward each other, the split-flow press-forming patterns 32 oppositely disposed in the first direction abut, and the split-flow press-forming patterns 32 are provided in plural at intervals in the longitudinal direction of the core plate portions 31. The arrangement of the split-flow type 32 enables the upper end opening of the central flow passage 34 to be divided by the split-flow type 32 into a plurality of third flame holes arranged at intervals in the second direction, thereby enabling flames at the central flow passage 34 to be burned in groups, increasing the flame heat dissipation area at the third flame holes, reducing the combustion temperature and further reducing the production of nitrogen oxides.

Further, the rectification profiling 33 is pressed against both the core plate portions 31 in the direction toward each other, and the rectification profiling 33 is disposed at intervals from both the upper end and the lower end of the core plate portion 31, and the rectification profiling 33 disposed opposite to each other in the first direction abuts. The flow direction and the flow speed of the premixed gas flowing through the rectification profiling 33 can be changed by arranging the rectification profiling 33, so that the flow speed of the premixed gas flowing out of the central flow passage 34 is slowed down, and the flameout is further avoided; meanwhile, the arrangement of the rectifying profiling 33 is beneficial to ensuring the consistency of the width of the central flow passage 34 at all positions, avoiding the influence on the dimensional accuracy of the central flow passage 34 caused by the local inward sinking of the core plate part 31, avoiding the dimensional deviation of the central flow passage 34 and improving the combustion stability of the flame at the third flame hole.

In an embodiment, the rectification profiling 33 of the two core plate parts 31 are arranged in a one-to-one correspondence, and the oppositely arranged rectification profiling 33 are mutually abutted, so that the two core plate parts 31 can adopt the same structure, the universality of the core plate parts 31 is improved, and the processing of the inner core 3 is simplified; meanwhile, the arrangement can reduce the pressing depth of the rectifying compression mold 33 on the basis of unchanged width of the central flow passage 34, so that the structural strength and rigidity of the whole inner core 3 are better ensured. In other embodiments, the rectifying profiling 33 of the two core plate portions 31 may be offset, and each rectifying profiling 33 abuts against the inner side surface of the other core plate portion 31.

The plurality of rectifying profiling 33 is divided into a first profiling 33a and a second profiling 33b, the first profiling 33a and the second profiling 33b being staggered in the second direction, and the first profiling 33a being arranged one-to-one under the splitting profiling 32. The second profiling 33b is a strip-like structure extending in the vertical direction. By means of the arrangement, the number of the rectifying profiling 33 can be increased, meanwhile, the rectifying profiling 33 and the shunting profiling 32 are prevented from interfering, and therefore the processing difficulty of the inner core 3 is reduced while the flow of premixed gas in the central flow channel 34 is guaranteed to be rectified.

In one embodiment, the first profiling 33a has a circular structure, and occupies a small space. In other embodiments, the first profiling 33a may have an oval structure with a long axis arranged in the vertical direction.

The invention also provides a burner comprising a fire grate in any of the embodiments described above. Through adopting above-mentioned fire row, can improve the burning sufficiency and the stability of combustor, reduce the nitrogen oxide that produces in the combustion process, and can simplify the structure of combustor, reduce the processing cost of combustor.

The invention also provides gas heating equipment comprising the burner. By adopting the burner, the operation stability and reliability of the gas heating equipment can be improved, the harmful gas generated during the operation of the gas heating equipment can be reduced, and the cost of the gas heating equipment can be reduced.

In the specific content of the above embodiment, any combination of the technical features may be performed without contradiction, and for brevity of description, all possible combinations of the technical features are not described, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The foregoing detailed description of the embodiments presents only a few embodiments of the present invention, which are described in some detail and are not intended to limit the scope of the present invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims (14)

1. A fire grate, comprising:

the inner shell (1) comprises two inner shell parts (11) which are oppositely arranged along a first direction, an injection channel (16) and a first premixing cavity (15) are formed around the two inner shell parts (11), the first premixing cavity (15) is arranged in an open mode, the lower end of the first premixing cavity is communicated with the injection channel (16), a rectifying plate part (111) which is vertically arranged is formed at the upper end of the inner shell part (11), and a fire plate part (12) is formed by outwards folding the upper end of the rectifying plate part (111);

The inner core (3) is vertically inserted into the first premixing cavity (15) and divides the first premixing cavity (15) into at least two first flow passages (102), each first flow passage (102) is positioned between one rectifying plate part (111) and the outer side wall of the inner core (3), and a first fire hole is formed at the upper port of each first flow passage (102);

The outer shell body (2), the cover is established the outside of inner shell body (1) and with two inner shell body (11) are formed with second premix chamber (101) around respectively, second premix chamber (101) with draw jet channel (16) intercommunication, just first premix chamber (15) with the air-fuel ratio of the interior mist of second premix chamber (101) is different, the outer end of fire plate portion (12) with form the second fire hole between the inner wall of outer shell body (2), the second fire hole with the upper end intercommunication of second premix chamber (101).

2. A fire grate according to claim 1, characterized in that the inner core (3) comprises two core plate parts (31) which are opposite and spaced along a first direction, a central flow passage (34) which is vertically penetrated is formed between the two core plate parts (31), a third fire hole is formed at an upper port of the central flow passage (34), and the first flow passage (102) is formed between the outer side of each core plate part (31) and the adjacent rectifying plate part (111).

3. A fire grate as claimed in claim 2, wherein the width of the central flow passage (34) in the first direction is smaller than the width of the first flow passage (102) in the first direction.

4. A fire grate as claimed in claim 3, wherein the first flow channel (102) has a width L ₁ in the first direction and the central flow channel (34) has a width L ₂,L₁：L₂ = 1.2-1.5 in the first direction;

and/or the width of the first flow channel (102) is 0.7 mm-2 mm;

and/or the width of the central runner (34) is 0.5 mm-1.5 mm.

5. A fire grate according to any one of claims 1-4, wherein the outer end of the fire plate part (12) is turned downwards to form a rectifying flanging part (13), a second flow passage (103) is formed between the rectifying flanging part (13) and the outer shell (2), an upper port of the second flow passage (103) forms the second fire hole, and the lower end of the second flow passage (103) is communicated with the second premixing cavity (101);

and/or the fire plate part (12) extends outwards to form an abutting part (14), and the outer end of the abutting part (14) abuts against the inner side wall of the outer shell (2).

6. A fire grate according to claim 5, characterized in that the rectifying flange portions (13) are staggered with the abutment portions (14) in a second direction, which is perpendicular to the first direction.

7. A fire grate according to claim 5, characterized in that the inner wall of the outer shell (2) is provided with outer shell profiling (22) protruding in a direction towards the second premix chamber (101), the outer shell profiling (22) being arranged opposite and spaced from the rectifying plate portion (111).

8. A fire grate as claimed in claim 7, wherein the upper end of the shell profiling (22) is arranged directly opposite the lower end of the rectifying flange portion (13) so that the lower end of the second flow channel (103) is narrowed relative to the upper end of the second flow channel (103);

And/or the height of the shell profiling (22) along the vertical direction is H, the height of the rectifying plate part (111) along the vertical direction is H, and h=0.6h-0.9h;

and/or the height of the outer shell profiling (22) protruding relative to the outer side wall of the outer shell (2) is d, and the width of the second flow channel (103) in the first direction is L ₃,d=0.5L₃~0.8L₃.

9. A fire grate according to any one of claims 1-4, characterized in that the height of the inner core (3) in the vertical direction is 12-20 mm; and/or the height of the rectifying plate part (111) along the vertical direction is 4 mm-10 mm.

10. A fire grate according to any one of claims 2-4, wherein the upper ends of two core plate parts (31) are provided with split-flow profiling (32) in a pressing manner in a direction toward each other, the split-flow profiling (32) being provided opposite each other in the first direction being abutted, the split-flow profiling (32) being provided in plurality at intervals in a second direction, the second direction being the length direction of the inner casing (1);

And/or, the two core plate parts (31) are respectively provided with a rectifying press mold (33) in a pressing way along the direction facing each other, the rectifying press mold (33) is respectively arranged at intervals with the upper end and the lower end of the core plate part (31), and the rectifying press molds (33) oppositely arranged in the first direction are abutted.

11. A fire grate as claimed in claim 10, wherein the plurality of rectifying press forms (33) on each core plate portion (31) are divided into first press forms (33 a) and second press forms (33 b), the plurality of first press forms (33 a) being disposed on the lower side of the split press forms (32) in one-to-one correspondence, the first press forms (33 a) and the second press forms (33 b) being disposed at staggered intervals in the second direction.

12. The fire grate of any one of claims 1 to 4, wherein the injection channel (16) comprises a first injection channel (16 a) and a second injection channel (16 b) which are separately arranged, the lower end of the first premixing cavity (15) is communicated with the first injection channel (16 a), the second premixing cavity (101) is communicated with the second injection channel (16 b), and the first injection channel (16 a) and the second injection channel (16 b) inject mixed gases with different air-fuel ratios.

13. A burner comprising a fire grate as claimed in any one of claims 1 to 12.

14. A gas heating plant comprising a burner as claimed in claim 13.