CN217109549U - A kind of burner - Google Patents

Abstract

The utility model discloses a burner, include: the furnace end is provided with an inner ring distribution air passage and an outer ring distribution air passage; the fire cover is provided with a top wall, an outer ring wall, an inner ring wall and a middle ring wall; the top wall is flared from bottom to top, the periphery of the top wall is recessed downwards in the circumferential direction to form a groove, and the inner annular wall forms a middle channel; the top wall, the inner annular wall and the middle annular wall form an inner annular gas cavity, and the top wall, the middle annular wall and the outer annular wall form an outer annular gas cavity; the inner ring gas cavity is communicated with the inner ring distribution gas passage, and the outer ring gas cavity is communicated with the outer ring distribution gas passage; the roof is provided with inner ring fire hole and outer loop fire hole, the inner ring fire hole with inner ring gas chamber intercommunication, the outer loop fire hole with outer loop gas chamber intercommunication. The utility model discloses a set up the air and supply the structure, solved the insufficient problem of current gas burner burning, concentrate on the combustor middle part with the firepower, promote heating efficiency.

Description

A kind of burner

Technical Field

The utility model relates to a gas-cooker technical field, more specifically say, relate to a combustor.

Background

At present, a rotary fire burner for a gas stove is generally an inner ring and an outer ring, wherein the inner ring and the outer ring are of a split structure, or the inner ring and the outer ring are connected through connecting spokes; the outer ring fire cover is in more contact with the outside air, so that heat can be dissipated into the air; the secondary air is mainly supplemented through the clearance between the inner ring fire cover and the outer ring fire cover, the structure of the fire cover is complex, the fire cover is inconvenient to install and maintain, the heat generated by gas combustion can be used for heating the fire cover too much and cannot be absorbed by a pot, and the heat efficiency is lower.

Therefore, it is necessary to design a fire cover structure of a burner, which satisfies the requirements of simple structure, less material consumption, low cost and high efficiency.

SUMMERY OF THE UTILITY MODEL

In some embodiments of this application, a combustor is provided, and it includes furnace end and fire lid, supplements the structure through setting up the air, has solved the insufficient problem of current gas burner burning.

In some embodiments of this application, improved the mode of putting out a fire of fire lid, go out the fire with the inner ring and set up to big fire, go out the fire with the outer ring and set up to the small fire, the firepower is concentrated on the combustor middle part, and is few to the heat dissipation capacity of air all around, and the middle part temperature is higher, is favorable to the lifting efficiency.

In some embodiments of the present application, the structure of the supplementary air is improved, the outer periphery of the top wall is recessed downwards in the circumferential direction to form a groove, and the combustion area is supplemented with the secondary air in the radial direction through the groove; the inner wall of the inner ring wall forms a middle channel, and secondary air is supplemented to the central combustion area upwards along the axial direction through the middle channel; the combustion in the combustion zone is more complete due to the sufficient air supplement.

In some embodiments of this application, improved the structure of fire lid roof, will the roof sets up to the flaring structure from bottom to top, and the wall forms heating space towards the bottom of a boiler, makes the fire hole slope burn to center pin blowout gas, realizes the concentrated heating to the bottom of a boiler.

In some embodiments of this application, improved the play fire angle in inner ring fire hole and outer loop fire hole, can guarantee that the flue gas does not exceed standard, can guarantee certain efficiency again.

In some embodiments of the present application, the arrangement structure of the fire holes is improved, and the fire holes are distributed in a left-handed or right-handed manner, and the structure length can be increased by the convoluted structure, so that the combustion area or the air intake area is increased.

In some embodiments of the application, the relative layout of the inner ring fire hole and the outer ring fire hole is improved, the inner ring fire hole and the outer ring fire hole rotate and extend from bottom to top relative to the center of the fire cover, uniform and stable gas flow can be formed, centripetal rotary fire can be formed after ignition, meanwhile, flame of the outer ring fire hole can heat flame of the inner ring fire hole to stabilize flame, and therefore heat can be further collected and the heat efficiency can be improved.

In some embodiments of this application, improved the overall arrangement structure of slot, the slot with outer loop fire hole direction of rotation is unanimous, the slot with fire hole sets up along circumference interval along the fire lid outward for go out fire and air supply interval, guarantee that the regional burning of outer loop burning is more abundant.

In some embodiments of the present application, there is provided a burner comprising: the furnace end is provided with an inner ring distribution air passage and an outer ring distribution air passage; a fire cover having a top wall, an outer annular wall, an inner annular wall and a middle annular wall; the top wall is flared from bottom to top, the periphery of the top wall is recessed downwards in the circumferential direction to form a groove, and the inner annular wall forms a middle channel; the top wall, the inner annular wall and the middle annular wall form an inner annular gas cavity, and the top wall, the middle annular wall and the outer annular wall form an outer annular gas cavity; the inner ring gas cavity is communicated with the inner ring distribution gas passage, and the outer ring gas cavity is communicated with the outer ring distribution gas passage; the roof is provided with inner ring fire hole and outer loop fire hole, the inner ring fire hole with inner ring gas chamber intercommunication, the outer loop fire hole with outer loop gas chamber intercommunication.

In some embodiments of the present application, the groove is flared from the inside to the outside.

In some embodiments of the present application, the groove is spaced apart from the outer ring fire hole.

In some embodiments of the present application, the gas-fired boiler further includes a main injection pipe and a secondary injection pipe, the main injection pipe is communicated with the inner ring distribution gas passage, and the secondary injection pipe is communicated with the outer ring gas cavity; the inner ring fire hole is used for forming a big fire; the outer ring fire holes are used for forming small fire.

In some embodiments of the present application, the main injection pipe and the secondary injection pipe are made of die-cast aluminum alloy; the fire cover is made of lead brass.

In some embodiments of the present application, the inner ring fire holes are distributed in a left-handed or right-handed manner; the outer ring fire holes are distributed in a left-handed or right-handed mode; the grooves are distributed in a left-handed or right-handed mode.

In some embodiments of the present application, the inner ring fire holes and the outer ring fire holes rotate in the same direction; the groove and the outer ring fire hole are in the same rotating direction.

In some embodiments of the present application, the groove is flared from the inside to the outside.

In some embodiments of the present application, the fire angle of the inner ring fire holes is 30 ° to 60 °, and the fire angle of the outer ring fire holes is 30 ° to 45 °.

In some embodiments of the present application, the fire lid is an integral stamping form.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.

The structure, ratio, size and the like shown in the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by people familiar with the technology, and are not used for limiting the limit conditions which can be implemented by the present invention, so that the present invention has no technical essential significance, and any structure modification, ratio relationship change or size adjustment should still fall within the scope which can be covered by the technical content disclosed by the present invention without affecting the efficacy and the achievable purpose of the present invention.

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

FIG. 2 is a front view of a burner according to an embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view taken along line A-A of FIG. 2 according to an embodiment of the present invention;

FIG. 4 is a perspective view of the cross section B-B in FIG. 2 according to an embodiment of the present invention;

fig. 5 is a perspective view of the cross section C-C in fig. 2 according to the embodiment of the present invention;

FIG. 6 is a schematic structural view of a fire cover in an embodiment of the present invention;

FIG. 7 is a front view of a fire cover in an embodiment of the present invention;

fig. 8 is a schematic cross-sectional view of the embodiment of the present invention taken along line D-D in fig. 7;

FIG. 9 is a schematic view of another perspective of the fire cover according to an embodiment of the present invention;

fig. 10 is a schematic structural view of a burner head in an embodiment of the present invention;

fig. 11 is a schematic view of another viewing angle of the furnace end according to the embodiment of the present invention.

In the figure, 100, fire lid; 110. a top wall; 111. an inner ring fire hole; 112. an outer ring fire hole; 120. an outer annular wall; 130. an inner annular wall; 140. a middle annular wall; 150. a trench; 160. a middle channel; 200. a furnace end; 210. the inner ring is provided with an air passage; 220. an outer ring distribution airway; 300. a main ejector pipe; 310. and a secondary injection pipe.

Detailed Description

The present invention is described in detail with reference to the specific embodiments, and other advantages and effects of the present invention will be apparent to those skilled in the art from the disclosure herein. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

In the description of the present application, it is to 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 those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.

The terms "first", "second" and "first" 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 defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

As shown in fig. 1 to 5, the present invention provides a fire cover 100 for a burner of a gas range, which has a top wall 110, an outer annular wall 120, an inner annular wall 130, and a middle annular wall 140; the outer annular wall 120 and the top wall 110 are circumferentially arranged along the outer edge of the top wall 110, the inner annular wall 130 is circumferentially arranged along the inner edge of the top wall 110, and the top wall 110, the outer annular wall 120 and the inner annular wall 130 form a gas cavity, wherein the gas cavity is divided into two relatively independent cavities serving as an inner ring gas cavity and an outer ring gas cavity by the middle annular wall 140; as a preferred embodiment, the top wall 110 in this embodiment is an annular circular truncated cone, and is adapted to a circular pan bottom, so as to ensure uniform heating; as a preferred embodiment, the fire cover 100 is formed by integral punching, so that the material consumption is low, the cost is low, the heat absorbed by the fire cover 100 is reduced, and the efficiency is improved.

As shown in fig. 6 to 9, according to some embodiments of the present application, the top wall 110 is an annular circular truncated cone or truncated pyramid structure, the top wall 110 is flared from bottom to top, and a wall surface faces a bottom of a pan to form a heating space, so that the fire holes are inclined to spray fuel gas toward a central axis to perform combustion, thereby realizing concentrated heating of the bottom of the pan; meanwhile, the spilled soup can be discharged to the outside of the fire cover 100 in time, so that the fire holes are prevented from being blocked, and the burner can be kept in high cleanliness. The structure of the top wall 110 can be adapted to different types of cookers, the heating area is effectively improved, and the heating is more uniform.

According to some embodiments of the present disclosure, the cross-section of the junction between the outer annular wall 120 and the top wall 110 is an inverted V-shape, the outer circumference of the top wall 110 is recessed downward to form a groove 150, the groove 150 is communicated with the outside air to serve as an oxygen supplement channel, and the secondary air can be supplemented to the combustion region in the radial direction through the groove 150; as a preferred embodiment, the grooves 150 are spaced from the outer ring fire holes 112, and the grooves 150 are mainly used as secondary air supplementary channels for outer ring flame combustion, so that the combustion in the outer ring combustion area is more sufficient, the emission of carbon monoxide is lower, the combustion efficiency is higher, and meanwhile, during combustion, the flame in the outer ring fire holes 112 can heat the flame in the inner ring fire holes 111, and the flame in the inner ring fire holes 111 can be effectively prevented from leaving the flame. In a preferred embodiment, the groove 150 is flared from inside to outside, and the opening on the outer side is large, so that the area of air entering from the groove 150 is increased, thereby increasing the circulation of external air in the groove 150 and improving the oxygen supplement effect of the groove 150; meanwhile, flue gas generated by combustion in the combustion area can be gradually diffused and discharged along the flaring-shaped grooves, the smoothness of the flue gas discharge is further improved, the flow rate of the flue gas discharged by diffusion is reduced, the impact condition of the flue gas discharge process on flame generated at the fire hole is correspondingly reduced, and the flame stability of the combustor is improved.

According to some embodiments of the present application, the outer ring wall 120 is not provided with fire holes, the fire is concentrated in the middle of the burner, the heat dissipation to the surrounding air is small, the temperature of the middle is high, the temperature of the heated bottom of the pan is more uniform and faster, and the flame combustion condition is good, the flame is stable, and the backfire and the flame separation are not easy to occur.

According to some embodiments of the present application, the inner wall of the inner annular wall 130 forms a middle channel 160, in this embodiment, the middle channel 160 may be a cylinder, a truncated cone, a prism or a truncated pyramid structure, but is not limited thereto, as long as the external air can be introduced into the center of the fire lid 100; the secondary air is supplemented to the central combustion area upwards along the axial direction through the middle channel 160, due to sufficient air supplement, the combustion of the central combustion area is more sufficient, the emission of carbon monoxide is lower, the combustion efficiency is higher, meanwhile, when gas is combusted, the airflow of the central combustion area is stable, the combustion is also stable, and the problems of flame separation and flameout of an inner ring and the like are solved; meanwhile, the middle channel 160 can make the middle part out of a larger space for installing an anti-dry heating probe, an igniter and the like; furthermore, the design of the structure can effectively reduce the diameter of the burner under the same combustion power, the material consumption is less, the cost is low, the heat absorbed by the fire cover 100 is reduced, and the efficiency is improved.

According to some embodiments of the application, the fire holes are distributed on the top wall 110, specifically on the inner side slope wall of the inverted V-shape formed by connecting the outer ring wall 120 and the top wall 110, and through the structural form of the top wall 110 and the distribution positions of the fire holes, the fire holes are easier to process, so that the manufacturing difficulty of the fire cover 100 is obviously reduced, meanwhile, the processing precision of the fire holes can be improved, part of the material of the fire cover 100 is saved, and the cost is reduced; in the present embodiment, the shape of the fire hole may be any shape such as a circle, an ellipse, a square, a rectangle, or the like; the fire holes are all arranged towards the bottom of the pan, so that the fire holes are inclined towards the central shaft to spray out gas for combustion, and the concentrated heating of the bottom of the pan is realized; in the embodiment, the fire holes comprise an inner ring fire hole 111 and an outer ring fire hole 112, the inner ring fire hole 111 is communicated with the inner ring gas cavity, and the outer ring fire hole 112 is communicated with the outer ring gas cavity; in a preferred embodiment, the inner ring fire holes 111 are used for forming a big fire; the outer ring fire holes 112 are used for forming small fire, the heat load of the inner ring fire accounts for 80 to 90 percent of the total heat load, the heat load of the outer ring fire accounts for 10 to 20 percent of the total heat load, the fire is concentrated at the middle part of the combustor, the heat dissipation to the surrounding air is less, the temperature of the middle part is higher, and the efficiency is improved; in a preferred embodiment, the flames in the outer ring fire holes 112 can heat the flames in the inner ring fire holes 111, and the flames in the inner ring fire holes 111 can be effectively prevented from leaving the flames.

According to some embodiments of the present application, the fire holes are circular, the fire angle of the inner ring fire hole 111 (i.e. the angle between the axis of the circular fire hole and the top surface of the fire cover 100) is 30-60 °, and the fire angle of the outer ring fire hole 112 is 30-45 ° (i.e. the angle between the axis of the circular fire hole and the top surface of the fire cover 100), so as to ensure that the smoke does not exceed the standard and ensure a certain efficiency.

On the basis of the above embodiment, the grooves 150 are distributed in a left-handed or right-handed manner; the outer ring fire holes 112 are distributed in a left-handed or right-handed manner; the inner ring fire holes 111 are distributed in a left-handed or right-handed manner. In this embodiment, the left-handed or right-handed structure may be a diagonal circumferential array or an arc circumferential array, and the convoluted structure may increase the length of the structure, thereby increasing the combustion area or intake area. In the present embodiment, the spiral directions of the flow paths of the plurality of grooves 150 arranged in an array are all the same. Firstly, the plurality of grooves 150 supplement oxygen to the combustion area of the fire cover at the same time, so that the oxygen supplement amount can be effectively improved, the sufficiency of gas combustion is correspondingly improved, and the combustion efficiency of the combustor is improved; secondly, the spiral directions of the circulation paths of the plurality of grooves 150 are consistent, so that the flow directions of the external air flowing into the combustion area through the plurality of grooves 150 are consistent, and on the basis of realizing oxygen supplement, the bad impact of mutual impact among a plurality of air flows on the flame in the oxygen supplement area can be effectively reduced, so that the stability of the flame in the oxygen supplement area is improved.

According to some embodiments of the present disclosure, the rotation direction of the groove 150 is the same as that of the outer ring fire hole 112, so that the external air flows into the combustion area through the groove 150, and is the same as the combustion oxygen consumption path, thereby reducing the impact of the airflow on the flame and improving the stability of the flame in the oxygen supplement area while achieving oxygen supplement; in a preferred embodiment, the grooves 150 and the fire holes are circumferentially spaced along the outer surface of the fire cover 100, so that the fire is spaced from the air supplement, and the combustion in the outer ring combustion area is more sufficient.

According to some embodiments of the present application, the inner ring fire hole 111 and the outer ring fire hole 112 have the same rotation direction, both of which are left-handed or right-handed, and the inner ring fire hole 111 and the outer ring fire hole 112 rotate from bottom to top with respect to the center of the fire cover 100 to extend, so as to form a uniform and stable gas flow, and after ignition, a centripetal fire whirl can be formed, and meanwhile, the flame of the outer ring fire hole 112 can heat the flame of the inner ring fire hole 111 to stabilize the flame, so that heat can be further collected, the thermal efficiency can be improved, and sufficient secondary air supplement is provided through the central channel structure, so as to ensure sufficient combustion; the flame sprayed from the fire holes is uniformly dispersed in the combustion zone, so that the fire is more uniform.

It is understood that the number and arrangement of the inner ring fire holes 111, the outer ring fire holes 112 and the grooves 150 are merely examples, and the actual number and arrangement of the inner ring fire holes 111, the outer ring fire holes 112 and the grooves 150 may be specifically set according to actual requirements to better meet practical applications.

According to some embodiments of the present application, the utility model provides a combustor for gas stove has the fire lid 100 and the furnace end 200 that above-mentioned embodiment provided, fire lid 100 covers and closes the top of furnace end 200, in this embodiment, furnace end 200 respectively with outer rampart 120, inner rampart 130 and well rampart 140 looks adaptation, and relative sealing connection to guarantee that inner ring gas chamber is relatively independent with outer ring gas chamber.

As shown in fig. 10 to 11, the burner 200 has an inner ring distribution air passage 210 and an outer ring distribution air passage 220, the inner ring distribution air passage 210 is respectively communicated with the inner ring gas cavity and the main injection pipe 300, and the outer ring distribution air passage 220 is respectively communicated with the outer ring gas cavity and the secondary injection pipe 310; the inner ring fire is configured into big fire, the outer ring fire is configured into small fire, the firepower is concentrated in the middle of the burner, the heat dissipation amount to the surrounding air is small, the temperature of the middle is high, and the efficiency is improved.

According to some embodiments of the present disclosure, the main injection pipe 300 and the secondary injection pipe 310 communicate with an external gas pipeline to provide gas, and deliver the gas into the inner ring gas cavity and the outer ring gas cavity of the fire cover 100.

On the basis of the above embodiment, the material of the injection pipe and the burner 200 is die-cast aluminum alloy, preferably ADC12, and the material of the fire cover 100 is lead brass, preferably HPb59-1 lead brass; the lead brass material is not easy to deform, has high heat conductivity coefficient and is beneficial to performance parameters of the combustor.

According to the first concept of the application, a combustor is provided, which comprises a furnace end and a fire cover, and solves the problem that the existing gas combustor burns insufficiently by arranging an air supplement structure.

According to the second design of this application, improved the mode of putting out a fire of fire lid, go out the fire with the inner ring and set up to big fire, go out the fire with the outer ring and set up to the small fire, the firepower is concentrated on the combustor middle part, and is few to the heat dissipation capacity of air all around, and the middle part temperature is higher, is favorable to the raising the efficiency.

According to the third concept of the present application, the structure of supplementing air is improved, the outer periphery of the top wall is recessed downward in the circumferential direction to form a groove, and secondary air is supplemented to the combustion area in the radial direction through the groove; the inner wall of the inner ring wall forms a middle channel, and secondary air is supplemented to the central combustion area upwards along the axial direction through the middle channel; the combustion in the combustion zone is more complete due to the sufficient air supplement.

According to the fourth design of this application, improved the structure of fire lid roof, will the roof sets up to the flaring structure from bottom to top, and the wall forms heating space towards the bottom of a boiler, makes the hole slope spout the gas to the center pin and burns, realizes the concentrated heating to the bottom of a boiler.

According to the fifth concept of the application, the fire outlet angle of the inner ring fire hole and the outer ring fire hole is improved, the smoke is not overproof, and certain efficiency can be guaranteed.

According to the sixth concept of the present application, the arrangement structure of the fire holes is improved, and the fire holes are arranged in a left-handed or right-handed distribution, and the structure length can be increased by a convoluted structure, so that the combustion area or the air intake area is increased.

According to the seventh concept of the application, the relative layout of the inner ring fire hole and the outer ring fire hole is improved, the inner ring fire hole and the outer ring fire hole rotate and extend from bottom to top relative to the center of the fire cover, uniform and stable gas flow can be formed, centripetal rotary fire can be formed after ignition, meanwhile, flame of the outer ring fire hole can heat flame of the inner ring fire hole to stabilize flame, and therefore heat can be further collected, and heat efficiency is improved.

According to the eighth design of this application, the overall arrangement structure of slot has been improved, the slot with outer loop fire hole direction of rotation is unanimous, the slot with fire hole sets up along circumference interval along the fire lid outward for go out fire and air supply looks interval, guarantee that the regional burning of outer loop burning is more abundant.

Although the invention has been described in detail with respect to the general description and the specific embodiments, it will be apparent to those skilled in the art that modifications and improvements can be made based on the invention. Therefore, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims (10)

1. A burner, comprising:

the furnace end is provided with an inner ring distribution air passage and an outer ring distribution air passage;

a fire cover having a top wall, an outer annular wall, an inner annular wall and a middle annular wall; the top wall is flared from bottom to top, and the periphery of the top wall is recessed downwards in the circumferential direction to form a groove; the inner wall of the inner ring wall forms a middle channel;

the top wall, the inner annular wall and the middle annular wall form an inner annular gas cavity, and the top wall, the middle annular wall and the outer annular wall form an outer annular gas cavity; the inner ring gas cavity is communicated with the inner ring distribution gas passage, and the outer ring gas cavity is communicated with the outer ring distribution gas passage; the roof is provided with inner ring fire hole and outer loop fire hole, the inner ring fire hole with inner ring gas chamber intercommunication, the outer loop fire hole with outer loop gas chamber intercommunication.

2. A burner as claimed in claim 1, wherein said channel is flared from the inside to the outside.

3. A burner as claimed in claim 1, wherein said grooves are spaced from said outer annular flame ports.

4. The burner of claim 1, further comprising a primary eductor tube and a secondary eductor tube, the primary eductor tube being in communication with the inner annular distribution gas passage, the secondary eductor tube being in communication with the outer annular gas chamber; the inner ring fire hole is used for forming a big fire; the outer ring fire holes are used for forming small fire.

5. The burner according to claim 4, wherein the main injection pipe and the secondary injection pipe are made of die-cast aluminum alloy; the fire cover is made of lead brass.

6. The burner of claim 1, wherein said inner ring fire holes are left-handed or right-handed; the outer ring fire holes are distributed in a left-handed or right-handed mode; the grooves are distributed in a left-handed or right-handed mode.

7. The burner of claim 6, wherein the inner ring fire holes and the outer ring fire holes rotate in the same direction; the groove and the outer ring fire hole are in the same rotating direction.

8. A burner as claimed in claim 1 or 6, wherein the channel is flared from the inside to the outside.

9. The burner as claimed in claim 1, wherein the fire angle of the inner ring fire holes is 30 ° -60 °, and the fire angle of the outer ring fire holes is 30 ° -45 °.

10. The burner of claim 1, wherein said fire cover is integrally stamped and formed.

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