CN212901988U

CN212901988U - Fire grate, burner and water heater for realizing thick and thin combustion

Info

Publication number: CN212901988U
Application number: CN202021814446.5U
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: 2020-08-26
Publication date: 2021-04-06
Anticipated expiration: 2030-08-26
Also published as: CN112113327A; CN212902051U; CN112113340A

Abstract

The utility model relates to a fire row, combustor and water heater that realize dense-dilute burning, including heart shell, inner shell, the heart shell is equipped with dense burning structure of giving vent to anger, the light burning structure of giving vent to anger including drawing the passageway, flow equalizing chamber, shunting chamber on shunting chamber's the lateral wall. The inner shell sets up the air guide structure including light burning mixing chamber, air inlet chamber on the lateral wall of inner shell, gives vent to anger the structure one-to-one contact with dense burning and switches on, forms the air inlet clearance outside the lateral wall of air inlet chamber and reposition of redundant personnel room, and the air inlet clearance gives vent to anger the structure with light burning and switches on, upwards switches on with light burning mixing chamber, and the top surface of light burning mixing chamber sets up light fire hole. The shell comprises a concentrated combustion air outlet chamber and an air conduction chamber, and an air conduction gap is formed between the air conduction chamber and the side wall of the air inlet chamber; the gas guide structure is communicated with the thick combustion gas outlet gap, and a thick fire hole is formed at the top of the thick combustion gas outlet gap.

Description

Fire grate, burner and water heater for realizing thick and thin combustion

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.

The rich-lean combustion method is regarded by various large-scale gas appliances as an effective combustion technology capable of remarkably reducing the emission of nitrogen oxides.

Research shows that the size of the air coefficient can significantly influence the generation amount of 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 nitrogen 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.

The applicant: patent document No. CN205480981U owned by taiwan cherry blossom company limited (hereinafter abbreviated as cherry blossom) relates to a thick-thin burner, which comprises a plurality of fire rows, wherein each fire row comprises two inner side plates, two outer side plates and a central plate group, the two inner side plates are connected with each other, an accommodating space, a thick combustion inlet, a thin combustion inlet and a thin flame channel are formed between the two inner side plates, and the thin flame channel is communicated with the thin combustion inlet; the two outer side plates are connected with each other, the two outer side plates are arranged on the outer sides of the two inner side plates and connected with the two inner side plates, two thick flame channels are formed between the two outer side plates and the two inner side plates and communicated with the thick combustion inlet, a plurality of through holes are respectively formed in the two inner side plates corresponding to the thick combustion inlet, so that the thick combustion inlet is communicated with the thick flame channels through the through holes, a pair of flame holes are respectively formed in the upper ends of the thick flame channels, the thick flame channels are communicated between the thick combustion inlet and the two auxiliary flame holes, and a long and narrow bulge and a triangular bulge are respectively arranged in each thick flame channel; the central plate group is arranged in the accommodating space and comprises two central side plates and at least one central inner plate, the at least one central inner plate is arranged between the two central side plates, a plurality of connecting parts which are mutually connected are arranged on two sides of the two central side plates and the at least one central inner plate and between the two sides at intervals, a plurality of main flame holes which penetrate through up and down are formed between the two central side plates and the at least one central inner plate, the light flame flow channel is communicated between the light combustion inlet and the main flame holes, an outer convex part is formed by extending the lower ends of the two central side plates outwards, the outer convex part abuts against the adjacent inner side plates in the two inner side plates, and a separation space is formed between the two sides of the central plate group and the two inner side plates respectively. "it is visible, every fire row of the thick and thin burner of the cherry blossom sets up thick burning entrance and thin burning entrance separately, belong to the burner of one pair of injection ports. 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.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a dense-dilute combustor and monomer thereof, through setting up dense combustion in the both sides of weak burning, the dense flame who produces through dense combustion holds the weak flame that weak burning produced, avoids middle weak burning to produce and takes off the fire phenomenon, improves the stability of 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 realize that the technical scheme that above-mentioned technical purpose adopted does: a fire grate of a thick-thin burner comprises a core shell, an inner shell and an outer 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 and a plurality of air guide structures, wherein the air inlet chamber and the light combustion mixing chamber are arranged from bottom to top, the air guide structures are arranged on the side wall of the inner shell, and the air guide structures are in one-to-one corresponding contact conduction with the air outlet structures for the concentrated combustion; the air inlet chamber covers the outer side of the flow distribution chamber and forms an air inlet gap outside the side wall of the flow distribution chamber, the air inlet gap is communicated with the light combustion air outlet structures, the bottom of the air inlet gap is provided with an air inlet structure, the air inlet gap is communicated with the light combustion mixing chamber upwards, and the top surface of the light combustion mixing chamber is provided with a light fire hole;

the outer shell is covered on the outer side of the inner shell and comprises an air drainage chamber and a rich combustion air outlet chamber which are arranged from bottom to top, an air drainage gap with a downward opening is formed between the air drainage chamber and the side wall of the air inlet chamber, and the air inlet structure is positioned in the air drainage gap; and a dense combustion air outlet gap which is opened upwards is formed between the sidewall of the dense combustion air outlet chamber and the sidewall of the dilute combustion mixing chamber, the plurality of air guide structures are communicated with the dense combustion air outlet gap, and a dense fire hole is formed at the top of the dense combustion air outlet gap.

Furthermore, the air guide gap is not communicated with the rich combustion air outlet gap, and the air guide gap is communicated with the air inlet gap through the air inlet structure. The supplementary air collected by the air guide gap is guided into the air guide gap as completely as possible for light combustion.

As an embodiment of this application, form long sand grip on the lateral wall of shell outside-in, long sand grip extends along length direction full length, long sand grip with the outer wall sealing contact of inner shell, thereby will air guide clearance with dense burning is given vent to anger and is separated the messenger and not switch on from top to bottom in the clearance. The arrangement is to prevent the air in the air guide gap 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 utility model discloses the people is preferred to give vent to anger the clearance with air drainage clearance and dense burning and carries out the shutoff, has thoroughly prevented to mix into the air in the dense burning clearance of giving vent to anger, has both realized the low air coefficient of dense burning, prevents again that air from disturbing the steady of air guide structure and giving vent to anger.

Further, the light combustion air outlet structures are provided with upward air outlets. The light combustion air outlet structure is positioned in the air inlet gap, supplemental air continuously flows into the air inlet gap, and the upward air outlet is used for directly upwards guiding the fuel gas coming out of the light combustion air outlet structure, so that two air flows which are parallel to each other and are close to each other in the same direction are formed by the upward air outlet and the supplemental air. The air seal formed by the supplementary air flow on the light combustion air outlet structure is prevented, and the air outlet of the light combustion air outlet structure is blocked.

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 initial 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 initial gas along the length direction of the flow dividing chamber.

Further, the flow distribution chamber has 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 are located above the light combustion air outlet structures on the same side wall, 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 initial gas outlet for realizing dense combustion and initial gas outlet for realizing light combustion are formed, mutual interference of air flow outlet of the dense combustion gas outlet structures and the light combustion gas outlet structures is reduced as much as possible, and stable 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 peripheries 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 mode. The initial fuel gas flowing out of the thick combustion air outlet is guided out of the inner shell through the thick combustion air guide hole, so that the initial fuel gas is separated from the thin 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 initial fuel 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 buffer holes help to uniformly premix the initial fuel gas and the supplementary air.

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.

Further, the bottom of the side wall of the air conduction chamber is formed into a concave-convex structure along the length direction. The utility model provides a fire row, the shell of adjacent fire row is that the shell is close to the mutual contact (generally not sealing contact), and the lateral wall of the air drainage room of preferred through the shell is close to the mutual contact (generally not sealing contact) to hinder the air and more easily follow the clearance between the adjacent fire row and flow, make the air more tend to get into by in the air drainage clearance that shell and inner shell formed, and then reentrant air intake clearance in, mix with the gas that the structure of giving vent to anger from the thin burning.

Furthermore, a plurality of bulges from outside to inside are arranged at intervals on the top of the side wall of the rich combustion air outlet chamber along the length direction, and the bulges are propped against the side wall of the lean combustion mixing chamber inwards, so that the top of the rich combustion air outlet gap is divided into a plurality of rich fire holes which are arranged at intervals.

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.

Another object of the present invention is to provide a dense-dilute burner, which comprises a plurality of fire rows combined side by side, wherein the fire rows adopt the above-described fire row structure; when the thick and thin combustor adopts the air-out mode of going up convulsions, a plurality of fire row below still sets up the deep bead, and the deep bead has a plurality of wind holes.

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 nitrogen oxide output in the combustion products, the combustor adopts the rich-lean combustion principle, structurally adopts single injection hole, and rich-lean combustion shunts, and light combustion replenishes air.

(2) On a single fire row, the combustion mode adopts a mountain-shaped combustion mode of middle light combustion and two-side thick combustion, the two-side thick combustion is oxygen-poor combustion, the middle light combustion is oxygen-rich combustion, and the two-side thick combustion is used for consuming the oxygen rich in the middle light combustion, so that light flame is pulled, and fire dropping is prevented. 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 thick combustion air outlet structure is arranged above the thin combustion air outlet structure, and the thin combustion mixing chamber is arranged at the upper part of the inner shell, so that the flow of the gas for thin combustion entering the thin combustion mixing chamber is prolonged, and the gas and the air are premixed in the flow. The light combustion gas outlet structure and the thick combustion gas outlet structure are arranged in a staggered mode from top to bottom, so that gas flow of thick and thin combustion gas is stable and uniform.

(5) An air inlet gap is formed between the core shell and the inner shell, an air drainage gap is formed between the inner shell and the outer shell, and the air inlet gap and the air drainage gap are communicated through an air inlet structure, so that the mixture of the supplementary air and the light combustion 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 and the air guide gap are mutually isolated, so that the air outlet interference of the supplementary air to the fuel gas for the rich combustion can be completely restrained, and the stability of the air flow in the rich combustion air outlet gap can be ensured. The fresh-burning air outlet structure is preferably provided with an upward air outlet, and the supplementary air and the fuel gas are mixed in the ascending process by nearly parallel air flows, so that the situation that the supplementary air generates air seal on the fresh-burning air outlet structure to prevent the fuel gas for fresh burning from smoothly discharging air is avoided.

Drawings

FIG. 1 is a front view of a core shell in an embodiment of the present invention;

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

FIG. 3 is a right side view of a core shell in an embodiment of the present invention;

fig. 4 is a front view of an inner shell in an embodiment of the invention;

fig. 5 is a top view of an inner shell in an embodiment of the invention;

fig. 6 is a perspective view of an inner shell in an embodiment of the present invention;

fig. 7 is a front view of the housing in an embodiment of the invention;

fig. 8 is a top view of an embodiment of the present invention;

FIG. 9 is a front view of an embodiment of the fire grate;

FIG. 10 is a top view of an embodiment of the present invention;

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

FIG. 12 is a cross-sectional view DD taken in FIG. 9;

FIG. 13 is a cross-sectional view of FF in FIG. 9;

FIG. 14 is a cross-sectional view of EE of FIG. 9;

FIG. 15 is a top view of a rich-lean burner in an embodiment of the present invention;

FIG. 16 is a front view of a rich burner in an embodiment of the present invention;

fig. 17 is a cross-sectional view BB in fig. 16;

in the figure, a core shell 1, an inner shell 2, an outer shell 3, a slow flow hole 4, 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 hole 17, a lean combustion air outlet hole 18, an air inlet chamber 21, a lean combustion mixing chamber 22, an air inlet gap 23, an air inlet inclined surface 24, an air inlet slit 25, a lean fire hole 26, an inner protrusion 27, a rich combustion air outlet hole 28, an inner protrusion 29, an air guide chamber 31, a rich combustion air outlet chamber 32, an air guide gap 33, a rich combustion air outlet gap 34, a long protrusion 35, a protrusion 36 and a rich fire hole 37.

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 with reference to the accompanying drawings, and the description of the orientation referred to in the description is based on the description of the drawings and should not be construed as limiting the specific structure.

Example 1

The embodiment relates to a fire grate of a thick and thin combustor, which comprises a core shell 1, an inner shell 2 and an outer shell 3, wherein the core shell, the inner shell and the outer shell are sequentially arranged from inside to outside. The core shell 1, the inner shell 2 and the outer shell 3 are respectively formed by connecting two mutually 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 connection mode can be that the side plates are mutually butt-welded.

As shown in fig. 1-3, 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 burn vent structure includes a protruding hole directly punched from the inside to the outside on the side wall of the branch chamber 14, and the protruding hole is preferably punched with its hole opening facing upward during the machining process, so that the protruding hole formed as the lean burn vent 18.

As shown in fig. 4-6, 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 is communicated with the light combustion air outlet hole 18, light combustion gas led out from the light combustion air outlet hole 18 enters the air inlet gap 23 to be premixed with air, then enters the light combustion mixing chamber 22 from the air inlet gap 23 upwards to be further mixed, and is combusted at the light flame hole 26 to form light flame.

The core effect of inner shell 2 is to separate the thick and thin burning, therefore must separate the gas of thick and thin burning, consequently, still is provided with a plurality of air guide structures on the lateral wall of inner shell 2, and a plurality of air guide structures are led to with a plurality of thick burning gas outlet structure one-to-one correspondence contact. 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 fuel gas for rich combustion is guided out of the inner shell 2.

In this embodiment, protruding strip 29 in outside-in formation on the lateral wall of inner shell 2, protruding strip 29 extends along length direction in, and the length extends, protruding strip 29 including above-mentioned air guide structure shaping, the terminal surface of protruding 27 in and protruding strip 29 flushes, it is protruding 16 terminal surfaces offset that protruding strip 29 and dense combustion go out the gas structure in structural expression, like this, the long clearance that protruding strip 29 and reposition of redundant personnel room 14 lateral wall formed just is separated into a plurality of slow-flow holes 4 by a plurality of outer archs 16 in the interior protruding strip 29, make air intake clearance 23 and thin combustion mixing chamber 22 communicate from top to bottom through a plurality of slow-flow holes 4 realization.

As shown in fig. 7-8, the outer shell 3 covers the outer side of the inner shell 2, the top of the outer shell 3 is open, two side plates forming the outer shell 3 are connected at the open top position through a plurality of connecting strips, including an air diversion chamber 31 and a rich combustion air outlet chamber 32 which are arranged from bottom to top, an air diversion gap 33 which is open downwards is formed between the air diversion chamber 31 and the side wall of the air inlet chamber 21, and the air inlet structure, i.e. the air inlet slit 25 is positioned within the air diversion gap 33. The rich combustion outlet chamber 32 forms an upwardly open rich combustion outlet gap 34 with the side wall of the lean combustion mixing chamber 22. The lateral wall of the outer shell 3 is formed with a long protruding strip 35 from outside to inside, the long protruding strip 35 extends along the length direction, and the long protruding strip 35 is abutted against the outer wall of the inner shell 2, so as to separate the air guide gap 33 and the rich combustion air outlet gap 34 up and down to enable the air guide gap to approach to non-conduction and preferably to be relatively blocked.

The rich burn air-guide holes 28 in the inner casing 2 communicate with the rich burn air-outlet gap 34. The top of the sidewall of the rich combustion outlet chamber 32 is provided with a plurality of protrusions 36 at intervals along the length direction, and the protrusions 36 are pressed against the sidewall of the lean combustion mixing chamber 22 inwards, so that the top of the rich combustion outlet gap 34 is divided into a plurality of rich fire holes 37 arranged at intervals.

The bottom of the side wall of the air diversion chamber 31 is formed into a concave-convex structure along the length direction, the space between the shells of the adjacent fire rows of the combustor is narrow, and the concave-convex structure can prevent air from flowing out upwards from the gap between the adjacent fire rows, so that the air tends to enter the air diversion gap 33, and the air is supplied for the light combustion mixing chamber 22.

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. The initial fuel gas in the diversion chamber 14 enters the air inlet gap 23 from the low-flame 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, and then enters the low-flame mixing chamber 22 through the slow flow hole 4 to be mixed, and finally burns at the low-flame hole to form low-flame. The other path of the initial fuel gas in the shunting chamber 14 enters the rich combustion air outlet gap 34 from the rich combustion air outlet hole 17 and the rich combustion air guide hole 28 above, and finally the rich flame is formed at the rich fire hole, the rich flame is positioned at two sides of the light flame, and the rich oxygen in the light flame is consumed by the rich flame with poor oxygen, so that the light flame is prevented from being extinguished, the flame rigidity is improved, the combustion is stabilized, and the combustion efficiency of the fuel gas is integrally improved.

Example 2

The embodiment relates to a thick and thin combustor, including a plurality of fire rows, a plurality of fire rows are arranged side by side and are made up, and the fire row adopts the fire row of embodiment 1. When the dense-dilute burner adopts an upper air draft, namely a negative pressure air outlet mode, wind shields are further arranged below the fire rows, and wind holes are formed in the wind shields and used for shunting.

Of course, the shade burner of the present embodiment can also adopt a downward blowing mode, i.e. a positive pressure blowing mode, and when adopting positive pressure blowing, the wind shielding plate should be arranged below the fire grates.

In addition, an air outlet channel is reserved between the fire grate and the fire grate, so that air flows are respectively formed on two sides of each fire grate, on one hand, the temperature of the fire grate is reduced, and on the other hand, dense flames are pushed from outside to 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 fire grate for realizing thick and thin combustion is characterized in that: comprises a core shell, an inner shell and an outer shell,

2. A fire grate as claimed in claim 1, wherein: the air guide gap is not communicated with the rich combustion air outlet gap, and the air guide gap is communicated with the air inlet gap through the air inlet structure.

3. A fire grate as claimed in claim 2, wherein: the lateral wall of the outer shell is provided with a long convex strip from outside to inside, the long convex strip extends in the length direction, and the long convex strip is in sealing contact with the outer wall of the inner shell, so that the air guide gap and the dense combustion air outlet gap are separated from each other from top to bottom to be non-conductive.

4. A fire grate as claimed in claim 1, wherein: the light combustion air outlet structures are provided with upward air outlets.

5. A fire grate as claimed in claim 1, wherein: 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.

6. A fire grate as claimed in claim 1, wherein: the flow dividing 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 dividing chamber 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 vertical direction.

7. A fire grate as claimed in claim 1, wherein: the dense combustion gas outlet structure comprises an outer protrusion formed on the side wall of the flow distribution chamber from inside to outside and a dense 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 hole opening of the convex hole faces upwards, and the convex hole is used as a thin combustion gas outlet hole.

8. The fire grate of claim 7, wherein: the gas guide structures comprise inner bulges formed on the side walls of the inner shell from outside to inside and concentrated combustion gas guide holes punched on the end faces of the inner bulges, the inner bulges are abutted against the end faces of the outer bulges to form contact seal, and the concentrated combustion gas guide holes are communicated with the concentrated combustion gas outlet holes in a one-to-one correspondence manner.

9. A fire grate as claimed in claim 1, wherein: interior sand grip is formed to the outside-in on the lateral wall of inner shell, interior sand grip extends along length direction, a plurality of air guide structure shaping are in on the interior sand grip, interior sand grip with the long clearance that the flow distribution chamber lateral wall formed is given vent to anger structure and air guide structure by the dense combustion of a plurality of mutual contacts and is separated into a plurality of slow flow holes, makes the air admission clearance with the light combustion mixing chamber passes through intercommunication about a plurality of slow flow hole realization.

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

11. A fire grate as claimed in claim 1, wherein: the bottom of the side wall of the air drainage chamber is formed into a concave-convex structure along the length direction.

12. A fire grate as claimed in claim 1, wherein: the top of the side wall of the rich combustion air outlet chamber is provided with a plurality of bulges from outside to inside at intervals along the length direction, and the bulges are propped against the side wall of the lean combustion mixing chamber inwards, so that the top of the rich combustion air outlet gap is separated into a plurality of rich fire holes which are arranged at intervals.

13. A fire grate as claimed in claim 1, wherein: the top surface of the light combustion mixing chamber is a plane or an inverted V-shaped top surface, and the light fire hole is formed in an inclined plane 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; the wind shield is arranged below the fire rows and provided with a plurality of wind holes.

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 household gas quick water heater, gas heating water heater and steam heat source machine.