CN212902051U

CN212902051U - Novel thick and thin burning fire grate, combustor and water heater

Info

Publication number: CN212902051U
Application number: CN202021926530.6U
Authority: CN
Inventors: 吴德忠
Original assignee: Jiangsu Yemao Kitchen & Bath Technology Co ltd
Current assignee: Jiangsu Yemao Kitchen & Bath Technology Co ltd
Priority date: 2020-05-26
Filing date: 2020-09-04
Publication date: 2021-04-06
Anticipated expiration: 2030-09-04
Also published as: CN112113340A; CN212901988U; CN112113327A

Abstract

The utility model relates to a novel thick and thin combustion fire grate, a burner and a water heater, wherein the fire grate comprises a core shell and an inner shell, and the side wall of a shunting chamber of the core shell is provided with a thick combustion gas outlet structure and a thin combustion gas outlet structure; the inner shell cover comprises an air inlet chamber, a light combustion mixing chamber, a plurality of air guide structures and a thick combustion flame hole structure, wherein the air guide structures and the thick combustion air outlet structures are arranged on the side wall of the inner shell and are in one-to-one corresponding contact conduction; an upward open rich combustion air outlet gap is formed between the inner shells of the adjacent fire rows arranged side by side, and a rich fire hole is formed at the top through a rich combustion flame hole structure. Through mutually supporting between the fire row, realize light burning on every fire row, realize dense burning between fire row and the fire row, dense and light flame interval has saved the equipment part that the fire was arranged, the cost is reduced.

Description

Novel thick and thin burning fire grate, combustor and water heater

Technical Field

The utility model relates to a water heater, rich and lean burner and fire row thereof especially can show water heater, rich and lean burner and fire row that reduces nitrogen oxide emission, stable flame.

Background

Nitrogen oxides are produced when fossil fuels (such as petroleum, coal, natural gas, etc.) are burned with oxygen at high temperatures. NO in nitrogen oxides, NO_xThe gas is gas with strong toxicity, the national institute sets the emission standard of the nitrogen oxide of the civil gas appliance, and manufacturers pay great attention to the generation of the nitrogen oxide in the design and production links of the gas appliance.

Research shows that the size of the air coefficient can obviously influence the generation amount of the nitrogen oxides in combustion products, and when the air coefficient is smaller or higher, the nitrogen oxides in the combustion products are lower. Specifically, when the air factor is low, for example, less than 0.6, the combustion temperature is low due to insufficient air supply, and the oxygen content in the combustion zone is low, thereby inhibiting the generation of nitrogen oxides; when the air ratio is high, significantly exceeds 1.0, such as greater than 1.4, the air is supplied in excess, and although the excess air increases the oxygen concentration in the combustion zone, the excess air also carries away a large amount of heat in the combustion zone so that the combustion temperature is lowered, and the lowering of the combustion temperature also helps to suppress the generation of nitrogen oxides. The combustion with smaller air coefficient is called rich combustion, and the corresponding flame is called rich flame; the combustion with a large air factor is called light combustion, and the corresponding flame is called light flame. Both the rich combustion and the lean combustion can suppress the generation of nitrogen oxides, but the suppression principles are different. In addition, the overall air factor for lean combustion should be close to (slightly higher than) that of the fully premixed intake.

Based on the rich-lean combustion principle, people propose a rich-lean combustor which is a mixed combustor combining rich flame and lean flame, wherein the air coefficient of the lean flame is high, the gas is insufficient, and the flame is short; the dense flame has a low air coefficient, insufficient air, and a long flame.

The rich-lean combustion technology is most widely applied to burning appliances such as gas water heaters. Publication No. CN205480981A discloses a rich-lean burner, which comprises a fire grate, wherein the fire grate is composed of an inner side plate, an outer side plate and a central plate group, and the central plate group further comprises a central side plate and a central inner plate. A thick combustion inlet and a thin combustion inlet are respectively arranged on each fire grate, and the fire grate belongs to a double-injection-port combustor. The secondary flame holes for the rich combustion are positioned at two sides of the main flame holes for the light combustion, and belong to a combustion mode of 'outer rich and inner light'. The burner also belongs to a full premix type air supply mode, namely air is not supplemented in the process of gas circulation. A single fire grate has more parts, a complex structure and high assembly precision requirement.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a novel dense and thin burning fire row, combustor and water heater through setting up dense burning in the both sides of weak burning, holds the weak flame that weak burning produced through the dense flame that dense burning produced, avoids middle weak burning to produce and takes off the fire phenomenon, improves the stability of whole burning from this, improves the flame rigidity of whole burning. The effect of reducing the generation amount of nitrogen oxides in combustion products by the thick and thin combustion method is exerted, and the safety and the combustion efficiency of thick and thin combustion are improved.

The utility model discloses a further aim is designed the component part of arranging above-mentioned fire, saves the equipment part quantity that single fire was arranged as far as, not only reaches save material's purpose, helps reducing the equipment process moreover and improves production efficiency.

The utility model discloses realize that the technical scheme that above-mentioned technical purpose adopted does: a novel thick and thin combustion fire grate comprises a core shell and an inner shell,

the core shell comprises an injection channel, a flow equalizing chamber and a flow dividing chamber which are arranged from bottom to top, wherein the flow equalizing chamber is opened from top to bottom, is connected with the flow dividing chamber and is connected with the injection channel, and a plurality of thick combustion air outlet structures and a plurality of thin combustion air outlet structures which are arranged at intervals along the length direction are arranged on the side wall of the flow dividing chamber;

the inner shell is covered outside the flow dividing chamber and comprises an air inlet chamber, a light combustion mixing chamber, a plurality of air guide structures and a thick combustion flame hole structure, wherein the air inlet chamber, the light combustion mixing chamber, the air guide structures and the thick combustion air outlet structures are arranged from bottom to top;

an upward open rich combustion air outlet gap is formed between the inner shells of the two adjacent fire rows which are arranged side by side, a rich fire hole is formed at the top of the rich combustion air outlet gap through the rich combustion flame hole structure, and the plurality of air guide structures are communicated with the rich combustion air outlet gap.

Further, an air flow channel is formed between two adjacent fire rows which are arranged side by side, and the air flow channel is communicated with the air inlet gap through the air inlet structure; the air inlet flow channel is not communicated with the rich combustion air outlet gap. Therefore, the supplementary air in the air flow channel is guided into the air inlet gap as completely as possible and is used for supplementing air to the light combustion mixing chamber, and light combustion is formed at the light fire holes on the combustion top surface.

Furthermore, frame-shaped convex strips are respectively formed on two side walls of the inner shell from inside to outside, and two adjacent fire rows which are arranged side by side are in sealing contact with each other through the frame-shaped convex strips to form the concentrated combustion air outlet gap with only the top opening. The frame-shaped convex strip is of a U-shaped structure and extends along the edge of the side wall of the inner shell. The arrangement is to prevent the air in the air flow channel from entering the rich combustion air outlet gap upwards, so that the air tends to enter the air inlet gap through the air inlet structure. The low air coefficient of the concentrated combustion is ensured, and the air interference of the air guide structure is prevented from stably supplying premixed fuel gas to the concentrated combustion air outlet gap.

Furthermore, the dense combustion flame hole structure is the shaping and is in the dense flame recess on the inner shell lateral wall, the dense flame recess extends from top to bottom, two relative dense combustion flame hole structures are crisscross each other, and the concave part of one side dense flame recess is relative with the arch of opposite side dense flame recess, and the several dense flame recess is arranged in succession along the length direction of inner shell and is constituted a dense flame groove unit, and two dense flame groove units crisscross each other form a wavy dense flame hole, and a plurality of dense flame holes set up along inner shell length direction interval.

Furthermore, a shunting structure is arranged between the adjacent thick flame groove units, and premixed fuel gas supplied from the thick combustion gas outlet gap flows to each thick flame hole through the shunting structure. The reposition of redundant personnel structure does short sand grip that the punching press formed from inside to outside on the lateral wall of inner shell, the short sand grip extends from top to bottom, and is adjacent dense fire hole passes through short sand grip separates.

Preferably, the light flame holes and the thick flame grooves which are close to each other correspond to each other in the width direction of the combustion top surface of the light combustion mixing chamber, further, the light flame holes correspond to the thick flame grooves one to one, and the light flames at the light flame holes are pulled by the thick flames in the thick flame grooves.

Further, the injection channel comprises a Venturi tube and a drainage tube, and the drainage tube is communicated with the Venturi tube in a U shape; the flow equalizing chamber is of a fan-shaped structure and is provided with an upper straight edge extending in the length direction and a lower straight edge extending in an inclined mode, and the drainage tube extends in an inclined mode along the lower straight edge. The premixed gas entering through the venturi tube is matched with the flow equalizing chamber through the drainage tube to realize uniform gas distribution to the flow dividing chamber, and the uniform gas distribution refers to uniform gas distribution of the premixed gas along the length direction of the flow dividing chamber.

Furthermore, the flow distribution chamber is provided with a closed top surface, dense combustion air outlet structures and light combustion air outlet structures which are respectively arranged on two side walls of the flow distribution chamber are symmetrical to each other, the dense combustion air outlet structures on the same side wall are located above the light combustion air outlet structures, and a plurality of dense combustion air outlet structures and a plurality of light combustion air outlet structures are arranged in a staggered mode in the up-down direction, so that stable premixed gas air outlet for realizing dense combustion and premixed gas air outlet for realizing light combustion are formed, mutual interference of air flow outlet of the dense combustion gas and the premixed gas air outlet for realizing light combustion is reduced as much as possible, and the stability of respective air flow is ensured.

Further, the rich combustion gas outlet structure comprises an outer protrusion formed on the side wall of the flow distribution chamber from inside to outside, and a rich combustion gas outlet hole formed by punching on the end face of the outer protrusion; the thin combustion gas outlet structure comprises a convex hole formed by direct punching from inside to outside on the side wall of the flow distribution chamber, the orifice of the convex hole faces upwards, and the convex hole is used as a thin combustion gas outlet hole.

Furthermore, the plurality of air guide structures comprise inner bulges formed on the side walls of the inner shell from outside to inside and concentrated combustion air guide holes punched on the end faces of the inner bulges, the end faces of the inner bulges and the end faces of the outer bulges are abutted to form contact sealing (the peripheral surfaces of the air guide holes and the air outlet holes), and the concentrated combustion air guide holes and the concentrated combustion air outlet holes are communicated in a one-to-one correspondence manner. The premixed gas flowing out of the dense combustion air outlet is guided out of the inner shell through the dense combustion air guide hole, so that the premixed gas is separated from the dilute combustion mixing chamber.

Further, protruding strip in the outside-in forms on the lateral wall of inner shell, interior protruding strip extends (preferably leads to long extension) along length direction, a plurality of air guide structure shaping are in on the interior protruding strip, interior protruding strip with the long clearance that the flow distribution chamber lateral wall formed is separated into a plurality of slow flow holes by a plurality of mutual contact's dense combustion air outlet structure and air guide structure, makes the air admission clearance with the light combustion mixing chamber passes through intercommunication about a plurality of slow flow hole are realized. The premixed gas flowing out upwards from the light combustion gas outlet structure and the supplementary air flowing out upwards from the air inlet gap respectively enter the light combustion mixing chamber through the plurality of slow flow holes. The plurality of the slow flow holes are beneficial to uniformly premixing premixed fuel gas and supplementary air for the lean combustion.

Further, the bottom of the side wall of the air inlet chamber is inwardly folded (the term "inwardly folded" means to wrap the core shell) to form an air inlet inclined plane, the bottom edge of the air inlet inclined plane is in sealing contact with the outer wall of the core shell, so that the air inlet chamber is sealed and wrapped on the bottom of the flow distribution chamber, and a plurality of air inlet slits are arranged on the air inlet inclined plane to serve as the air inlet structure. Considering the difficulty of "bottom seal parcel" equipment on the production line, this application air inlet structure can also adopt another embodiment: the bottom of the side wall of the air inlet chamber is provided with a concave-convex structure, and an air inlet is formed by the concave-convex structure and the outer wall of the core shell.

Furthermore, the top surface of the light combustion mixing chamber is a plane or an inverted V-shaped top surface, and the light flame holes are formed in the inclined surface of the inverted V-shaped top surface, so that the light flame has a hedging tendency to the thick flame on the side surface.

The utility model also aims at providing a thick and thin burner, which comprises a plurality of fire rows, wherein the fire rows are combined side by side, and the fire rows are of the structure; wind shields are arranged below the fire rows and provided with a plurality of wind holes; and a partition plate is arranged on the outer side of the fire grate at the most end part, the rich combustion air outlet gap is formed between the partition plate and the outer side wall of the inner shell of the fire grate, and rich fire holes are formed between the partition plate and the rich combustion flame hole structure. The fire row at the extreme end is the fire row at the head end and the tail end of a plurality of fire rows arranged side by side, and the clapboard has the function of forming a rich combustion air outlet gap at the outer side of the fire row at the extreme end and generating rich flames at the top of the rich combustion air outlet gap.

The utility model discloses still need to provide the following application of above-mentioned rich and lean burner on the water heater:

a household gas instantaneous water heater comprises the shade burner, a water tank and an air outlet unit.

A gas heating water heater comprises the shade burner, a water tank and an air outlet unit.

A steam heat source machine comprises the thick and thin combustor, a water tank and an air outlet unit.

Compared with the prior art, the utility model discloses an advantage includes at least:

(1) in order to reduce the generation amount of nitrogen oxides in combustion products, the combustor adopts a dense-dilute combustion principle, structurally adopts a single injection hole, injects gas (premixed gas) wrapped with air into a centripetal shell through the single injection hole, the premixed gas is divided, one way is led out to realize dense combustion with a lower air coefficient, and the other way is mixed with supplementary air to realize light combustion with a higher air coefficient.

(2) The burning top surface of fire row is light burning, is dense burning between fire row and the fire row, realizes dense and thin flame interval from this and sets up, consumes the air that is abundant in the light flame through dense flame to hold light flame, prevent to take off the fire. The integral combustion is more stable, and the flame rigidity is improved.

(3) Adopt single injection hole to admit air, through venturi, drainage tube, the room three cooperation that flow equalizes, reduce the gas dead angle that flows, improve the homogeneity of initial gas at fire row length direction gas distribution.

(4) The dense combustion air outlet structure is arranged above the light combustion air outlet structure, and the light combustion mixing chamber is arranged at the upper part of the inner shell, so that the flow of the premixed gas entering the light combustion mixing chamber is prolonged, and the premixed gas and the air can be premixed in the flowing process in the air inlet gap. The dilute combustion gas outlet structure and the concentrated combustion gas outlet structure are arranged in a staggered mode from top to bottom, so that premixed gas flow for concentrated and dilute combustion is relatively stable and uniform.

(5) An air inlet gap is formed between the core shell and the inner shell, an air flow channel is formed between adjacent fire rows, and the air inlet gap and the air flow channel are communicated through an air inlet structure, so that the mixing of supplementary air and premixed gas in the air inlet gap is realized.

(6) The air intake structure employs an air intake slit on an intake slope, thereby achieving uniform intake of air. Of course, this is only a preferred embodiment of the present invention, and should not be construed as limiting the air intake structure of the present invention.

(7) The rich combustion air outlet gap is designed into a semi-closed structure with an open top, so that the rich combustion air outlet gap is isolated from the air flow channel or the air inlet gap, the interference of supplementary air on premixed gas in the rich combustion air outlet gap is favorably and thoroughly prevented, and the rich combustion is ensured to keep a lower air coefficient and the stability of air outlet.

(8) The light combustion air outlet structure is located in the air inlet gap, the supplementary air continuously flows into the air inlet gap, the light combustion air outlet structure preferably has an upward air outlet, so that the supplementary air and the premixed gas are mixed by two approximately parallel air flows in the ascending process, and the phenomenon that the supplementary air generates an air seal on the light combustion air outlet structure to prevent the premixed gas from smoothly discharging air is avoided.

(9) This application dense fire hole is the wave, and the dense flame that every dense fire hole came out also is the wave type, and some flame of every dense flame is close to left light flame, and another part flame is close to the light flame on right side for dense flame between adjacent fire row can interfere the both sides fire row simultaneously and go up light flame.

(10) Based on above-mentioned (9), the fire row of this application does not realize the rich and lean burning alone, must mutually support between fire row and the fire row, could realize the rich and lean burning of rich and lean flame interval distribution. This application comprises two parts of core shell and inner shell, and in the realization structure of thick and thin burning, mainly realize based on the inner shell, the inner shell top of every fire row is used for realizing thin burning, is used for realizing thick burning between the inner shell of adjacent fire row, and structural design is compact ingenious, and part is small in quantity, and low in manufacturing cost helps popularizing and applying.

Drawings

FIG. 1 is a front view of a fire grate in an embodiment of the present invention;

FIG. 2 is a top view of an embodiment of the present invention;

FIG. 3 is a left side view of an embodiment of the present invention;

FIG. 4 is a perspective view of an embodiment of the fire grate of the present invention;

FIG. 5 is an exploded view of an embodiment of the fire grate;

fig. 6 is a perspective view of a burner according to an embodiment of the present invention;

fig. 7 is a perspective view of another perspective view of the burner in an embodiment of the present invention;

FIG. 8 is a front view of a burner according to an embodiment of the present invention;

FIG. 9 is a top view of a burner according to an embodiment of the present invention;

fig. 10 is a bottom view of a burner according to an embodiment of the present invention;

FIG. 11 is a cross-sectional view CC of FIG. 9;

FIG. 12 is a cross-sectional view of the two endmost fire rows;

in the figure, a core shell 1, an inner shell 2, an air flow channel 3, a wind shield 4, a partition plate 5, a shell 6, an exhaust hole 62, a venturi tube 11, a draft tube 12, a flow equalizing chamber 13, a flow dividing chamber 14, a closed top surface 15, an outer protrusion 16, a rich combustion air outlet 17, a lean combustion air outlet 18, an air inlet chamber 21, a lean combustion mixing chamber 22, an air inlet gap 23, an air inlet inclined plane 24, an air inlet slit 25, a lean fire hole 26, an inner protrusion 27, a rich combustion air guide hole 28, an inner protrusion 29, a rich flame groove 31, a rich flame groove unit 32, a rich combustion air outlet gap 34, a frame-shaped protrusion 35, a short protrusion 36, a rich fire hole 37 and a wind hole 41.

Detailed Description

The present invention will be described in further detail with reference to the following drawings, which are illustrative and are not to be construed as limiting the present invention. The description of the present embodiment is made corresponding to the accompanying drawings, and the description related to the orientation is also made based on the accompanying drawings, which should not be construed as limiting the scope of the present invention.

Example 1

The embodiment relates to a novel thick and thin combustion fire grate, which comprises a core shell 1 and an inner shell 2, wherein the inner shell 2 is sleeved at the top of the core shell 1. The core shell 1 and the inner shell 2 are respectively formed by connecting two symmetrical side plates in an involution mode, wherein the connection mode can be that one side plate is used for covering the other side plate, and the side plates can be mutually butt-welded.

As shown in fig. 1-5, the core shell 1 includes an injection passage, a flow equalizing chamber 13, and a flow dividing chamber 14, which are arranged from bottom to top, wherein the flow equalizing chamber 13 has the narrowest width, an upper opening and a lower opening, the upper flow dividing chamber 14 is connected with the lower flow equalizing chamber, the lower flow injecting passage is connected with the lower flow equalizing chamber, the injection passage includes a venturi tube 11 and a drainage tube 12, and the drainage tube 12 is in U-shaped communication with the venturi tube 11. The flow equalizing chamber 13 is of a fan-shaped structure due to the fact that the flow equalizing chamber is provided with an arc-shaped baffling area, the flow equalizing chamber is provided with an upper straight edge extending in the length direction and a lower straight edge extending in an inclined mode, the drainage tube 12 extends along the lower straight edge in an inclined mode, the caliber of the drainage tube 12 is gradually narrowed along the flowing direction of the fuel gas, and the fuel gas is enabled to be equalized on the upper straight edge of the flow equalizing chamber 13 as far. In order to fully exert the uniform air distribution function of the Venturi tube 11, the drainage tube 12 and the flow equalizing chamber 13, two side plates of the core shell 1 are mutually attached in the bottom and left and right directions of the Venturi tube 11, the drainage tube 12 and the flow equalizing chamber to eliminate air flow dead angles.

The flow dividing chamber 14 is used for dividing fuel gas for dense-dilute combustion, and has a closed top surface 15, two side walls of the flow dividing chamber 14 are respectively provided with a plurality of dense combustion gas outlet structures and a plurality of dilute combustion gas outlet structures which are arranged at intervals along the length direction, the dense combustion gas outlet structures and the dilute combustion gas outlet structures on the two side walls are mutually symmetrical, the dense combustion gas outlet structures on the same side wall are positioned above the dilute combustion gas outlet structures, as shown in fig. 1, the plurality of dense combustion gas outlet structures are arranged on the top edge of the side wall, and the dense combustion gas outlet structures and the dilute combustion gas outlet structures are staggered in the up-down direction according to the quantity ratio of 1: 2.

Specifically, the rich combustion gas outlet structure includes an outer protrusion 16 formed on the side wall of the branch chamber 14 from the inside to the outside, and a rich combustion gas outlet hole 17 punched on the end face of the outer protrusion 16. The lean combustion gas outlet structure comprises a convex hole directly punched from inside to outside on the side wall of the flow distribution chamber 14, and the hole opening of the convex hole is upward, so that the formed convex hole is used as the lean combustion gas outlet 18.

As shown in fig. 4-5, the inner casing 2 includes an air intake chamber 21 and a lean burn mixing chamber 22 arranged from bottom to top, the air intake chamber 21 covers the outside of the branch chamber 14, the lean burn mixing chamber 22 is located above the branch chamber 14, an air intake gap 23 is formed outside the side walls of the air intake chamber 21 and the branch chamber 14, the air intake gap 23 is communicated with the above lean burn mixing chamber 22, and a lean fire hole 26 is formed in the top surface of the lean burn mixing chamber 22. The bottom of the side wall of the air inlet chamber 21 is folded inwards to form an air inlet inclined plane 24, the edge of the bottom of the air inlet inclined plane 24 is attached to the outer wall of the core shell 1, so that the air inlet chamber 21 is approximately sealed and wrapped on the bottom of the diversion chamber 14, a plurality of air inlet slits 25 are further arranged on the air inlet inclined plane 24, and the air inlet slits 25 are used as air inlet structures of the air inlet gaps 23.

The air inlet gap 23 and the light combustion air outlet 18 are respectively communicated with the light combustion mixing chamber 22, the premixed gas supplied from the light combustion air outlet 18 enters the air inlet gap 23, is premixed with the air rising in the air inlet gap 23, then enters the light combustion mixing chamber 22 for further mixing, and finally burns at the light fire hole 26 to form light flame.

The inner shell 2 not only needs to realize the shunting of the premixed gas: one path is used for the air supply of the rich combustion, the other path is used for the air supply of the light combustion, and the combustion of the rich combustion is also realized.

For the split of premixed gas: the side wall of the inner shell 2 is provided with a plurality of air guide structures, and the plurality of air guide structures are in one-to-one corresponding contact conduction with the plurality of thick combustion air outlet structures. Specifically, the plurality of air guide structures comprise inner protrusions 27 formed on the side walls of the inner shell 2 from outside to inside and rich combustion air guide holes 28 punched on the end faces of the inner protrusions 27, the inner protrusions 27 and the end faces of the outer protrusions 16 of the rich combustion air outlet structures are abutted to form contact sealing, and the rich combustion air guide holes 28 and the rich combustion air outlet holes 17 are communicated in a one-to-one correspondence mode, so that premixed gas for rich combustion is guided out of the inner shell 2.

In this embodiment, the inside convex strip 29 is formed on the lateral wall of the inner shell 2 from outside to inside, the inside convex strip 29 extends along the length direction, and the length of the inside convex strip 29 extends, the inside convex strip 29 is formed on the inside convex strip 29 of the above air guide structure, the end surfaces of the inside convex strip 27 and the inside convex strip 29 are flush, the inside convex strip 29 is structurally represented to be offset with the outer convex 16 end surface of the rich combustion air outlet structure, and thus, the long gap formed by the inside convex strip 29 and the lateral wall of the flow splitting chamber 14 is separated into a plurality of slow flow channels by the plurality of outer convex 16, so that the air inlet gap 23 and the lean combustion mixing chamber 22 are communicated with each other through the plurality of.

Frame-shaped convex strips 35 are formed on the side walls of the two sides of the inner shell 2 from inside to outside respectively, and the frame-shaped convex strips 35 extend along the edges of the side walls and are U-shaped with an open top. And then, the side walls of the two sides of the inner shell 2 are provided with a rich combustion flame hole structure, and the rich combustion flame hole structure is arranged on the top edge of the side wall of the inner shell 2. Two adjacent fire rows arranged side by side are in opposite sealing contact through frame-shaped convex strips 35 to enclose a rich combustion air outlet gap 34 with an open top, rich fire holes 37 are formed at the top of the rich combustion air outlet gap 34 through opposite dense combustion flame hole structures, and the rich combustion air guide holes 28 are communicated with the rich combustion air outlet gap 34.

An air flow channel 3 is formed between two adjacent fire rows which are arranged side by side, mainly between the core shells 1, the air flow channel 3 is positioned below the rich combustion air outlet gap 34, and the two air flow channels are nearly not communicated, namely, the air in the air flow channel 3 hardly flows upwards into the rich combustion air outlet gap 34. The air flow path 3 is communicated with the air intake gap 23 through the air intake narrow gap 25, and thus it is considered that the air flow path 3 replenishes air only to the air intake gap 23.

As shown in fig. 4 and 5, the structure of the rich combustion flame hole of the present embodiment is a rich flame groove 31 formed on the sidewall of the inner casing 2, the rich flame groove 31 extends up and down, and the rich flame groove 31 protrudes out of the sidewall of the inner casing. The two opposite thick combustion flame holes are staggered, namely, the concave part of the thick flame groove (31) at one side is opposite to the convex part of the thick flame groove (31) at the other side. A plurality of continuous thick flame grooves 31 form a thick flame groove unit 32, two thick flame groove units 32 which are staggered form a wavy thick flame hole 37, and a plurality of thick flame holes 37 are arranged at intervals along the length direction.

Two rows of light fire holes 26 are formed in the combustion top surface of the inner shell 2 along the length direction, the light fire holes 26 and the thick flame grooves 31 correspondingly approach in the width direction, and the thick flame grooves 31 on the two sides of the thick fire holes 37 are mutually staggered, so that the two rows of light fire holes 26 on the same combustion top surface are also mutually staggered.

A plurality of short convex strips 36 are formed on the side wall of the inner shell 2 by punching from inside to outside, each short convex strip 36 extends up and down, the short convex strips 36 are positioned between the adjacent thick flame groove units 32, the short convex strips 26 on two sides of each thick flame hole 37 are in one-to-one correspondence and contact with each other, so that the adjacent thick flame holes 37 are separated, and premixed gas supplied by the thick combustion gas outlet gap 34 is distributed through the short convex strips 26 in contact with each other and then is supplied to each thick flame hole 37.

The thick and thin combustion process of the fire row is as follows:

the gas wrapped with air is uniformly distributed to the shunting chamber 14 through the Venturi tube 11, the drainage tube 12 and the flow equalizing chamber 13. One path of the premixed gas in the branch flow chamber 14 enters the air inlet gap 23 from the low-flame combustion air outlet hole 18 at the lower part, is premixed with the supplementary air entering the air inlet gap 23 from the air inlet narrow gap 25, then enters the low-flame combustion mixing chamber 22 upwards for mixing, and finally burns at the low-flame hole to form low flame. The other part of premixed gas in the flow dividing chamber 14 enters the rich combustion gas outlet gap 34 from the rich combustion gas outlet hole 17 and the rich combustion gas guide hole 28 above, and finally burns at the wavy rich fire holes 37 to form rich flames, the rich flames are positioned between the adjacent fire rows, and the light flames are positioned on the top surfaces of the fire rows and are spaced to form rich and light combustion.

The thick flame of each thick flame hole 37 is wave-shaped, and can form interference with the thin flame at two sides respectively, and the rich oxygen in the thin flame is consumed by the thick flame with poor oxygen, so that the thin flame is prevented from being misfired, the rigidity of the flame is improved, and the combustion is stabilized.

Example 2

The embodiment relates to a combustor, including a plurality of fire rows, a plurality of fire rows are arranged side by side and are made up, fixed mounting is in casing 6, and casing 6 is located all fire rows periphery, sets up exhaust hole 62 on casing 6, and exhaust hole 62 sets up along the edge of casing for the upper and lower circulation of air avoids producing the cyclone vortex between casing 6 and all fire rows especially the corner. The fire grate adopts the fire grate described in embodiment 1, the partition plate 5 is arranged on the outer side of the fire grate at the extreme end, a rich combustion air outlet gap 34 is also formed between the partition plate 5 and the outer side wall of the inner shell of the fire grate at the extreme end, and a rich combustion hole 37 is also formed between the partition plate 5 and the rich combustion flame hole structure.

Wind shields 4 are further arranged below the fire rows, wind holes 51 are formed in the wind shields 4, and edge holes are also formed in the edges of the wind shields 4 and used for air distribution and uniform air intake. For thereby forming air flow on both sides of each fire row respectively, on one hand, cooling the fire rows and on the other hand, pushing the thick flame from the outside to the inside.

Example 3

The embodiment relates to a water heater, such as a household gas instantaneous water heater, a gas heating water heater and a steam heat source machine, which comprises a shade burner, a water tank and an air outlet unit in the embodiment 2. The air outlet unit can be an upper air draft fan or a lower air draft fan. The water tank is positioned above the thick and thin burner.

In addition to the above embodiments, the present invention also includes other embodiments, and all technical solutions formed by equivalent transformation or equivalent replacement should fall within the protection scope of the claims of the present invention.

Claims

1. A novel thick and thin burning fire grate is characterized in that: comprises a core shell (1) and an inner shell (2),

the core shell (1) comprises an injection channel, a flow equalizing chamber (13) and a flow dividing chamber (14) which are arranged from bottom to top, wherein the flow equalizing chamber (13) is opened from top to bottom, is connected with the flow dividing chamber (14) from top to bottom, and is connected with the injection channel from bottom to top, and a plurality of thick combustion gas outlet structures and a plurality of thin combustion gas outlet structures which are arranged at intervals along the length direction are arranged on the side wall of the flow dividing chamber (14);

the inner shell (2) covers the flow dividing chamber (14) and comprises an air inlet chamber (21), a light combustion mixing chamber (22), a plurality of air guide structures and a thick combustion flame hole structure, wherein the air inlet chamber (21), the light combustion mixing chamber (22) and the air guide structures and the thick combustion flame hole structure are arranged from bottom to top, the air guide structures and the thick combustion air outlet structures are in one-to-one corresponding contact conduction, the air inlet chamber (21) covers the outer side of the flow dividing chamber (14) and forms an air inlet gap (23) outside the side wall of the flow dividing chamber (14), the bottom of the air inlet gap (23) is provided with the air inlet structure, the top of the air inlet gap is upwards communicated with the light combustion mixing chamber (22), the light combustion air outlet structures are upwards communicated with the light combustion mixing chamber (22), and the combustion top surface of the light combustion mixing chamber (22) is provided with;

two adjacent fire rows that set up side by side form upwards open rich burning air outlet gap (34) between inner shell (2), and pass through rich burning flame hole structure is in the top of rich burning air outlet gap (34) forms rich fire hole (37), a plurality of air guide structures with rich burning air outlet gap (34) switch on.

2. A fire grate as claimed in claim 1, wherein: an air flow channel (3) is formed between two adjacent fire rows which are arranged side by side, and the air flow channel (3) is communicated with the air inlet gap (23) through the air inlet structure; the air flow channel (3) is not communicated with the rich combustion air outlet gap (34).

3. A fire grate as claimed in claim 2, wherein: frame-shaped convex strips (35) are respectively formed on two side walls of the inner shell (2) from inside to outside, and two adjacent fire rows which are arranged side by side are in sealing contact with the frame-shaped convex strips (35) to form a dense combustion air outlet gap (34) with an opening at the top.

4. A fire grate as claimed in claim 1, wherein: the structure of the thick combustion flame holes is a thick flame groove (31) formed on the side wall of the inner shell (2), the thick flame groove (31) extends up and down, and two opposite structures of the thick combustion flame holes are staggered with each other, namely, a concave part of the thick flame groove (31) at one side is opposite to a convex part of the thick flame groove (31) at the other side; the multiple thick flame recess (31) are arranged in succession along the length direction of inner shell (2) and are constituted a thick flame recess unit (32), and two thick flame recess units (32) that crisscross each other form a wavy thick fire hole (37), and a plurality of thick fire hole (37) set up along inner shell (2) length direction interval.

5. A fire grate as claimed in claim 4, wherein: the thin fire holes (26) and the thick flame grooves (31) which are close to each other correspond to each other in the width direction of the combustion top surface of the thin combustion mixing chamber (22).

6. A fire grate as claimed in claim 4, wherein: a flow dividing structure is arranged between the adjacent thick flame groove units (32), and premixed fuel gas supplied by the thick combustion gas outlet gap (34) flows to each thick fire hole (37) through the flow dividing structure; the reposition of redundant personnel structure does short sand grip (36) that the punching press formed from inside to outside on the lateral wall of inner shell, short sand grip (36) extend from top to bottom, and it is adjacent dense fire hole (37) pass through short sand grip (36) are separated.

7. A fire grate as claimed in claim 1, wherein: the injection channel comprises a Venturi tube (11) and a drainage tube (12), and the drainage tube (12) is communicated with the Venturi tube (11) in a U shape; the flow equalizing chamber (13) is of a fan-shaped structure and is provided with an upper straight edge extending in the length direction and a lower straight edge extending obliquely, and the drainage tube (12) extends obliquely along the lower straight edge.

8. A fire grate as claimed in claim 1, wherein: the flow dividing chamber (14) is provided with a closed top surface, dense combustion air outlet structures and light combustion air outlet structures which are respectively arranged on two side walls of the flow dividing chamber (14) are mutually symmetrical, the dense combustion air outlet structures on the same side wall are positioned above the light combustion air outlet structures, and the plurality of dense combustion air outlet structures and the plurality of light combustion air outlet structures are arranged in a staggered mode in the up-down direction.

9. A fire grate as claimed in claim 1, wherein: the rich combustion gas outlet structure comprises an outer bulge (16) formed on the side wall of the flow distribution chamber (14) from inside to outside, and a rich combustion gas outlet hole (17) formed by punching on the end face of the outer bulge (16); the thin combustion gas outlet structure comprises a convex hole directly formed by punching from inside to outside on the side wall of the flow distribution chamber, the hole opening of the convex hole faces upwards, and the convex hole is used as a thin combustion gas outlet hole (18).

10. A fire grate as set forth in claim 9 wherein: the gas guide structures comprise inner bulges (27) formed on the side walls of the inner shell (2) from outside to inside and rich combustion gas guide holes (28) formed in the end faces of the inner bulges (27), the inner bulges (27) and the end faces of the outer bulges (16) are abutted to form contact sealing, and the rich combustion gas guide holes (28) and the rich combustion gas outlet holes (17) are communicated in a one-to-one correspondence mode.

11. A fire grate as claimed in claim 1, wherein: protruding strip (29) in outside-in formation on the lateral wall of inner shell (2), interior protruding strip (29) extend along length direction, a plurality of air guide structure shaping are in on interior protruding strip (29), interior protruding strip (29) with the long clearance that flow distribution chamber (14) lateral wall formed is separated into a plurality of slow flow holes by a plurality of thick combustion air outlet structure and the air guide structure of mutual contact, makes air admission clearance (23) with light combustion mixing chamber (22) pass through intercommunication about a plurality of slow flow hole realization.

12. A fire grate as claimed in claim 1, wherein: the bottom of the side wall of the air inlet chamber (21) is inwardly folded to form an air inlet inclined plane (24), the bottom edge of the air inlet inclined plane (24) is in sealing contact with the outer wall of the core shell (1), so that the bottom of the flow distribution chamber (14) is hermetically wrapped by the air inlet chamber, and a plurality of air inlet slits (25) are arranged on the air inlet inclined plane (24) to serve as the air inlet structure.

13. A fire grate as claimed in claim 1, wherein: the combustion top surface of the light combustion mixing chamber (22) is a plane or an inverted V-shaped top surface, and the light fire holes (26) are formed in the inclined surface of the inverted V-shaped top surface.

14. A burner, characterized by: the fire grate comprises a plurality of fire grates which are combined side by side, wherein the fire grates are defined in any one of claims 1-13; wind shields (4) are arranged below the fire rows, and the wind shields (4) are provided with a plurality of wind holes (41); the outer side of the fire grate at the most end part is provided with a partition plate (5), a rich combustion air outlet gap (34) is formed between the partition plate (5) and the outer side wall of the inner shell of the fire grate, and a rich combustion hole is formed between the partition plate (5) and the rich combustion flame hole structure.

15. A water heater, characterized in that: comprising the burner, the water tank and the air outlet unit of claim 14.

16. The water heater according to claim 15, wherein: the water heater is selected from one of a household gas quick water heater, a gas heating water heater and a steam heat source machine.