CN215831914U - Fire cover, combustor and gas-cooker - Google Patents

Abstract

The application discloses fire lid, combustor and gas-cooker relates to gas-cooker technical field, reduces the combustor among the prior art and goes out the risk that flame appears in fire mouth department at the second. The utility model provides a fire lid includes roof, first annular arch, second annular arch and third annular arch, and first annular arch, second annular arch and third annular arch all set up the first surface at the roof. The second annular bulge is positioned on the inner side of the first annular bulge; the third annular projection is located inside the second annular projection. The top wall is provided with a first fire outlet and a second fire outlet, and the first fire outlet is positioned between the orthographic projections of the first annular bulge and the second annular bulge on the top wall; the second fire outlet is positioned between the orthographic projections of the second annular bulge and the third annular bulge on the top wall. The fire cover of the present application is for a burner.

Description

Fire cover, combustor and gas-cooker

Technical Field

The application relates to the technical field of gas stoves, in particular to a fire cover, a burner and a gas stove.

Background

The gas stove is a common cooking utensil in daily life, and a burner adopted by the existing household gas stove generally comprises a main fire outlet and an auxiliary fire outlet. The fuel gas is burnt at the main fire outlet to form an outer ring fire; and burning at the secondary fire outlet to form inner ring fire.

At present, among the prior art, the fire lid of combustor is covered including mutually independent interior fire lid and outer fire lid, and interior fire is covered and is equipped with secondary fire outlet, and outer fire is covered and is equipped with main fire outlet.

However, the inner fire cover and the outer fire cover which are arranged independently have complex structure, more materials and high production cost.

SUMMERY OF THE UTILITY MODEL

The application provides a fire lid, combustor and gas-cooker to simplify the structure of fire lid, reduce materials, reduction in production cost.

In order to achieve the purpose, the technical scheme is as follows:

in a first aspect, an embodiment of the present application provides a fire cover for a burner, where the fire cover includes a top wall, a first annular protrusion, a second annular protrusion, and a third annular protrusion, and the first annular protrusion, the second annular protrusion, and the third annular protrusion are all disposed on a first surface of the top wall. Wherein the first surface is one of two major surfaces opposite the top wall; the second annular bulge is positioned on the inner side of the first annular bulge; the third annular projection is located inside the second annular projection. A first fire outlet and a second fire outlet are formed in the top wall, wherein the first fire outlet is located between orthographic projections of the first annular bulge and the second annular bulge on the top wall; the second fire outlet is located between the orthographic projections of the second annular bulge and the third annular bulge on the top wall.

The first fire outlet and the second fire outlet of the fire cover of the embodiment of the application are both arranged on the top wall, so that the structure of the fire cover is simplified, materials are reduced, and the production cost of the fire cover is reduced. In addition, the first fire outlet is arranged between the orthographic projections of the first annular bulge and the second annular bulge on the top wall, and the second fire outlet is arranged between the orthographic projections of the second annular bulge and the third annular bulge on the top wall. That is, only the second annular protrusion is used to separate the first fire outlet from the second fire outlet, so that the distance between the first fire outlet and the second fire outlet can be reduced. Based on this, when using this fire lid to the combustor, can improve the heating effect of the flame of first fire outlet department to the flame of second fire outlet department to improve the combustion rate of the flame of second fire outlet department, reduce the combustor and appear the risk of leaving the flame in second fire outlet department.

In some embodiments, the top wall, the first annular bead, the second annular bead, and the third annular bead are integrally formed.

In some embodiments, the top wall includes a first annular side plate and a second annular side plate, an end of the inner ring of the first annular side plate being connected to an end of the outer ring of the second annular side plate. The second annular bulge is located at the junction of the first annular side plate and the second annular side plate. The axis of the first fire outlet is perpendicular to the first annular side plate, and the axis of the second fire outlet is perpendicular to the second annular side plate. And one end of the outer ring of the first annular side plate is positioned on the front side of one end of the inner ring of the first annular side plate along the first direction. The first direction is parallel to the axis of the first annular side plate and is directed from the first surface of the top wall to the second surface of the top wall; the second surface is the other of the two major surfaces opposite the top wall.

In some embodiments, one end of the outer ring of the second annular side plate is located rearward of one end of the inner ring of the second annular side plate in the first direction.

In some embodiments, an acute angle of an included angle between an axis of the first fire outlet and an axis of the first annular side plate ranges from 20 ° to 45 °; and/or the range of an acute angle in an included angle between the axis of the second fire outlet and the axis of the second annular side plate is 20-45 degrees.

In some embodiments, the first fire outlets are multiple, and the multiple first fire outlets are uniformly distributed along the circumferential direction of the top wall. The second fire outlet is a plurality of, and is a plurality of the second fire outlet is along the circumference evenly distributed of roof.

In some embodiments, each of the first fire outlets corresponds to one of the second fire outlets. The orthographic projection of the first fire outlets on the reference surface and the orthographic projection of the second fire outlets on the reference surface are staggered in the radial direction of the first annular bulge, and one fire outlet corresponds to each adjacent two fire outlets. The reference surface is a plane perpendicular to the axis of the first annular projection.

In some embodiments, the first fire outlet and the second fire outlet are both strip-shaped. The extension line of the orthographic projection of the first fire outlet on the reference surface in the length direction is intersected with the extension line of the orthographic projection of the second fire outlet on the reference surface in the length direction, and the acute angle of the included angle of the two intersected extension lines ranges from 45 degrees to 60 degrees.

In a second aspect, an embodiment of the present application further provides a burner, which includes a burner, a main injection pipe, a secondary injection pipe and a fire cover, wherein the fire cover is any one of the above embodiments. The furnace end is connected with the first annular bulge and the second annular bulge to form a first mixed air cavity; the furnace end is connected with the second annular bulge and the third annular bulge to form a second air mixing cavity. The first air mixing cavity is communicated with the secondary injection pipe, and the second air mixing cavity is communicated with the main injection pipe.

The combustor of the embodiment of the application has the same beneficial effects as the fire cover provided by the technical scheme, and the description is omitted here.

In a third aspect, an embodiment of the present application further provides a gas stove, including the burner in the foregoing embodiment.

The gas stove of the embodiment of the application has the same beneficial effects as the burner provided by the technical scheme, and the description is omitted here.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic structural view of a fire lid provided in accordance with some embodiments of the present application;

FIG. 2 is a cross-sectional view of the fire lid of FIG. 1 taken along section line A-A;

FIG. 3 is a bottom view of a fire lid provided in accordance with some embodiments of the present application;

FIG. 4 is a top view of a fire lid provided in accordance with some embodiments of the present application;

FIG. 5 is an exploded view of a burner provided in accordance with certain embodiments of the present application;

FIG. 6 is a schematic structural view of a combustor provided in accordance with certain embodiments of the present application;

FIG. 7 is a cross-sectional view of the burner of FIG. 6 taken along section line B-B.

Reference numerals:

100-fire cover; 200-a furnace end; 300-a main ejector pipe; 400-time injection pipe; 500-a burner; 1-a top wall; 11-a first annular side plate; 12-a second annular side plate; 2-a first fire outlet; 3-a second fire outlet; 4-a first annular projection; 5-a second annular protuberance; 6-a third annular projection; 7-a first gas mixing cavity; 8-second air mixing cavity.

Detailed Description

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

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.

It should be noted that in practical applications, due to the limitation of the precision of the device or the installation error, the absolute parallel or perpendicular effect is difficult to achieve. In the present application, the description of "perpendicular", "parallel" or "same direction" is not an absolute limitation, but means that a perpendicular or parallel structural arrangement can be achieved within a preset error range, and a corresponding preset effect is achieved, so that the technical effect of limiting the features can be maximally achieved, and the corresponding technical scheme is convenient to implement and has high feasibility. For example, "perpendicular" includes absolute perpendicular and approximately perpendicular, where an acceptable deviation from approximately perpendicular may also be within 5 °, for example. "parallel" includes absolute parallel and approximately parallel, wherein an acceptable deviation from approximately parallel may also be, for example, within 5 °. "co-directional" includes absolute co-directional and approximately co-directional, wherein an acceptable deviation range for approximately co-directional may also be, for example, a deviation within 5 °.

In the description of the present application, it is to be noted that the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected unless otherwise explicitly stated or limited. 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 by those of ordinary skill in the art as appropriate.

In the embodiments of the present application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

In the embodiments of the present application, words such as "exemplary" or "for example" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.

Referring to fig. 1, 2 and 3, an embodiment of the present application provides a fire cover 100 applied to a burner 500 (see fig. 5). The fire lid 100 includes a top wall 1, a first annular protrusion 4, a second annular protrusion 5, and a third annular protrusion 6.

Referring to fig. 2, a first annular protrusion 4, a second annular protrusion 5 and a third annular protrusion 6 are each provided on a first surface of the top wall 1, wherein the first surface is one of the two opposite major surfaces of the top wall 1. And, the second annular projection 5 is located inside the first annular projection 4, and the third annular projection 6 is located inside the second annular projection 5. In addition, first annular arch 4, second annular arch 5 and third annular arch 6 can guide the air current, make the air current more smooth and easy to the stability of flame burning has been improved.

The two main surfaces of the top wall 1 opposite to each other mean two surfaces of the top wall 1 having a large surface area.

Referring to fig. 1 and 3, the top wall 1 is provided with a first fire outlet 2 and a second fire outlet 3. Wherein, the first fire outlet 2 is positioned between the orthographic projections of the first annular bulge 4 and the second annular bulge 5 on the top wall 1, and the second fire outlet 3 is positioned between the orthographic projections of the second annular bulge 5 and the third annular bulge 6 on the top wall 1. With first fire outlet 2 and second fire outlet 3 all set up on roof 1, simplified the structure of fire lid 100, reduced the material, reduced the manufacturing cost of fire lid 100. In addition, the first fire outlet 2 is arranged between the orthographic projections of the first annular bulge 4 and the second annular bulge 5 on the top wall 1, and the second fire outlet 3 is arranged between the orthographic projections of the second annular bulge 5 and the third annular bulge 6 on the top wall 1, namely, the first fire outlet 2 and the second fire outlet 3 are spaced by only adopting the second annular bulge 5, so that the distance between the first fire outlet 2 and the second fire outlet 3 can be reduced. Because, when the mixed gas of the fuel gas and the air is emitted through the first fire outlet 2 or the second fire outlet 3 at a speed higher than the burning speed of the flame, correspondingly, the flame-out phenomenon occurs at the first fire outlet 2 or the second fire outlet 3. Based on this, when the fire cover 100 in the embodiment of the present application is applied to the burner 500, the heating effect of the flame at the first fire outlet 2 on the flame at the second fire outlet 3 can be improved, so as to improve the combustion rate of the flame at the second fire outlet 3 and reduce the risk of the burner 500 leaving the flame at the second fire outlet 3.

In some embodiments, the aperture of the second fire outlet 3 is set to be larger than the aperture of the first fire outlet 2, i.e., the second fire outlet 3 is taken as the main fire outlet. In this way, the heat load of the flame at the second flame outlet 3 can be made larger than the heat load of the flame at the first flame outlet 2, so that the heat is concentrated at the middle of the burner 500, the heat radiation to the surrounding air is reduced, and the heating efficiency of the burner 500 is improved.

In order to improve the strength of the fire lid 100, in some embodiments, the top wall 1, the first annular protrusion 4, the second annular protrusion 5, and the third annular protrusion 6 are integrally formed, so as to improve the structural strength of the fire lid 100, prolong the service life of the fire lid 100, simplify the production process of the fire lid 100, improve the production efficiency of the fire lid 100, and reduce the cost.

In some embodiments, referring to fig. 2, the top wall 1 comprises a first annular side plate 11 and a second annular side plate 12. One end of the inner ring of the first annular side plate 11 is connected to one end of the outer ring of the second annular side plate 12, and the second annular protrusion 5 is located at a boundary of the first annular side plate 11 and the second annular side plate 12 to separate the gas mixing channels (see fig. 7) corresponding to the first fire outlet 2 and the second fire outlet 3.

It should be noted that the gas mixing passages (refer to fig. 7) corresponding to the first fire outlet 2 and the second fire outlet 3 refer to the first gas mixing chamber 7 and the second gas mixing chamber 8 mentioned in the following description of the burner 500, which is not described herein again.

Referring to fig. 2, the axis of the first fire outlet 2 is perpendicular to the first annular side plate 11, so that the manufacturing is simple and the cost is low. In the first direction, one end of the outer ring of the first annular side plate 11 is located on the front side of one end of the inner ring of the first annular side plate 11. Wherein the first direction is parallel to the axis of the first annular side plate 11 and is directed from the first surface of the top wall 1 to the second surface of the top wall 1. The second surface is the other of the two opposite major surfaces of the top wall 1.

Based on this, the direction of putting out a fire of first fire outlet 2 will incline to the direction of keeping away from the axis of first annular curb plate 11 to increase the interval between the flame of first fire outlet 2 department and the flame of second fire outlet 3 department, make secondary air's replenishment more abundant, guarantee that the gas can the abundant burning.

On the basis, the axis of the second fire outlet 3 is vertical to the second annular side plate 12, so that the manufacturing is simple and the cost is low. In the first direction, one end of the outer ring of the second annular side plate 12 is located on the rear side of one end of the inner ring of the second annular side plate 12. Based on this, the fire direction of the second fire outlet 3 is inclined in a direction approaching the axis of the second annular side plate 12. Therefore, the distance between the flame at the first fire outlet 2 and the flame at the second fire outlet 3 can be further increased, so that the supplement of secondary air is more sufficient, and the full combustion of fuel gas is ensured; the heat power can be concentrated in the middle of the burner 500, reducing the heat radiation to the surrounding air, and improving the heating efficiency of the burner 500.

When the acute angle alpha in the included angle between the axis of the first fire outlet 2 and the axis of the first annular side plate 11 is smaller, the distance between the flame at the first fire outlet 2 and the flame at the second fire outlet 3 is smaller, the supplement of secondary air is insufficient, the gas can not be sufficiently combusted, and the phenomenon that the smoke exceeds the standard is easy to occur. When the acute angle α between the axis of the first fire outlet 2 and the axis of the first annular side plate 11 is large, the flame at the first fire outlet 2 cannot be intensively combusted at the middle part of the burner 500, so that the heat loss is large and the heating efficiency is low.

Based on this, in some embodiments, referring to fig. 2, the acute angle α in the angle between the axis of the first fire outlet 2 and the axis of the first annular side plate 11 ranges from 20 ° to 45 °. Namely, the included angle between the first annular side plate 11 and the axis ranges from 45 degrees to 70 degrees, that is, the included angle between the axis of the first fire outlet 2 and the horizontal plane ranges from 45 degrees to 70 degrees.

Under the condition, the secondary air can be supplemented more sufficiently, so that the fuel gas is combusted sufficiently, and the phenomenon that the smoke exceeds the standard is prevented; and, heat loss is reduced, and heating efficiency of the burner 500 is improved.

When the acute angle beta in the included angle of the axis of the second fire outlet 3 and the axis of the second annular side plate 12 is smaller, the distance between the flame at the first fire outlet 2 and the flame at the second fire outlet 3 is smaller, the supplement of secondary air is insufficient, the gas can not be sufficiently combusted, and the phenomenon that the smoke exceeds the standard is easy to occur. When the acute angle beta in the included angle between the axis of the second fire outlet 3 and the axis of the second annular side plate 12 is large, when the stove is heated, flame at the second fire outlet 3 is separated from the bottom of the stove, and the heating efficiency is low.

Based on this, in some embodiments, referring to fig. 2, the acute angle β in the angle between the axis of the second fire outlet 3 and the axis of the second annular side plate 12 of 1 ranges from 20 ° to 45 °. Namely, the included angle between the second annular side plate 12 and the axis ranges from 45 degrees to 70 degrees, that is, the included angle between the axis of the second fire outlet 3 and the horizontal plane ranges from 45 degrees to 70 degrees.

Under the condition, the secondary air can be supplemented more sufficiently, so that the fuel gas is combusted sufficiently, and the phenomenon that the smoke exceeds the standard is prevented; and, the heat power is concentrated at the bottom of the cooker, improving the heating efficiency of the burner 500.

Referring to fig. 4, in order to improve the fire of the burner 500, in some embodiments, the first fire outlets 2 are plural, and the plural first fire outlets 2 are uniformly distributed along the circumferential direction of the top wall 1. Wherein, make a plurality of first fire outlets 2 along the circumference evenly distributed of roof 1, can be when heating cooking utensils for the heating is more even.

On the basis, please refer to fig. 4, the second fire outlets 3 are plural, and the plural second fire outlets 3 are also uniformly distributed along the circumferential direction of the top wall 1. This further enhances the fire of the burner 500 and ensures a more even heating of the hob.

In some embodiments, referring to fig. 3 and 4, one second fire outlet 3 corresponds to each first fire outlet 2. The orthographic projection of the first fire outlets 2 on the reference surface and the orthographic projection of the second fire outlets 3 on the reference surface are staggered in the radial direction of the first annular bulge 4, and each two adjacent first fire outlets 2 correspond to one second fire outlet 3. The reference plane is a plane perpendicular to the axis of the first annular projection 4. So, can make a plurality of first fire outlets 2 and a plurality of second fire outlets 3 distribute more evenly on roof 1 to make flame more even with secondary air's contact, the abundant burning of the gas of being convenient for.

In some embodiments, referring to fig. 4, the first fire outlet 2 and the second fire outlet 3 are both bar-shaped. The extension line of the orthographic projection of the first fire outlet 2 on the reference surface in the length direction is intersected with the extension line of the orthographic projection of the second fire outlet 3 on the reference surface in the length direction. That is, the second fire outlets 3 are inclined in a direction approaching the first fire outlets 2. Like this, the flame of second fire outlet 3 department passes the fire more smoothly to the flame of first fire outlet 2 departments, more does benefit to the flame of first fire outlet 2 departments to heat, thereby improve the combustion rate of the flame of first fire outlet 2 departments, reduce combustor 500 and go out the risk that the flame appears in second fire outlet 3 departments.

When the acute angle gamma in the included angle of the two intersecting extension lines is small, the flame at the second fire outlet 3 has an unobvious heating effect on the flame at the first fire outlet 2, the flame stabilizing effect is poor, and the flame leaving phenomenon easily occurs at the second fire outlet 3 of the burner 500. When the acute angle gamma in the included angle of two intersecting extension lines is large, the distance between the flame at the first fire outlet 2 and the flame at the second fire outlet 3 is small, the supplement of secondary air is insufficient, the gas can not be sufficiently combusted, and the phenomenon that the smoke exceeds the standard is easy to occur.

Based on this, in some embodiments, referring to fig. 4, the acute angle γ of the included angle of the two extension lines intersecting ranges from 45 ° to 60 °.

In this case, a better flame stabilizing effect can be obtained, and the risk of flame separation of the burner 500 at the second fire outlet 3 is reduced; and make the supplementary more abundant of secondary air, reduce the risk that the flue gas exceeds standard.

Referring to fig. 5 and 6, the embodiment of the present application further provides a burner 500, which includes a burner 200, a main injection pipe 300, a secondary injection pipe 400, and a fire cover 100. The fire cover 100 is the fire cover 100 of any of the above embodiments.

The beneficial effects of the burner 500 provided in the embodiment of the present application are the same as the beneficial effects of the fire cover 100 provided in the above technical solution, and are not described herein again.

Wherein the burner 200 is coupled with the first and second annular protrusions 4 and 5 to form the first air mixing chamber 7. The burner 200 is coupled with the second and third annular protrusions 5 and 6 to form the second air mixing chamber 8. The first air mixing cavity 7 is communicated with the secondary ejector pipe 400, and the second air mixing cavity 8 is communicated with the main ejector pipe 300.

Therefore, gas enters from the main injection pipe 300, is mixed by the second gas mixing cavity 8 and finally exits from the second fire outlet 3, and combustion with high firepower is realized; the gas enters from the main injection pipe 300, is mixed by the second gas mixing cavity 8 and finally exits from the second fire outlet 3, so that the combustion of small firepower is realized.

Because the gas flow in the main injection pipe 300 is greater than the gas flow in the secondary injection pipe 400, the heat load of the flame at the second fire outlet 3 is greater than the heat load of the flame at the first fire outlet 2. Thus, the heat is concentrated on the middle portion of the burner 500, reducing heat radiation to the surrounding air, and improving the heating efficiency of the burner 500.

In some embodiments, the cross-sectional area of the second air mixing chamber 8 in the horizontal direction is larger than the cross-sectional area of the first air mixing chamber 7 in the horizontal direction. In this way, the heat load of the flame at the second fire outlet 3 can be further increased. The burner 500 in the embodiment of the present application enables the heat load of the flame at the second fire outlet 3 to occupy 80% to 90% of the total heat load of the burner 500.

The embodiment of the application also provides a gas stove which comprises the burner 500 in any one of the embodiments.

The beneficial effects of the gas stove provided by the embodiment of the application are the same as the beneficial effects of the fire cover 100 provided by the technical scheme, and are not repeated herein.

In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (10)

1. A fire cover applied to a burner is characterized by comprising:

the top wall is provided with a first fire outlet and a second fire outlet;

a first annular projection disposed on the first surface of the top wall; the first surface is one of two major surfaces opposite the top wall;

a second annular protrusion disposed on the first surface of the top wall; the second annular bulge is positioned on the inner side of the first annular bulge;

a third annular projection provided on the first surface of the top wall; the third annular bulge is positioned on the inner side of the second annular bulge;

wherein the first fire outlet is located between orthographic projections of the first annular bulge and the second annular bulge on the top wall; the second fire outlet is located between the orthographic projections of the second annular bulge and the third annular bulge on the top wall.

2. The fire lid of claim 1, wherein the top wall, the first annular bead, the second annular bead, and the third annular bead are integrally formed.

3. The fire lid as claimed in claim 1, wherein the top wall includes a first annular side plate and a second annular side plate, one end of the inner ring of the first annular side plate is connected with one end of the outer ring of the second annular side plate, and the second annular protrusion is located at the intersection of the first annular side plate and the second annular side plate; the axis of the first fire outlet is vertical to the first annular side plate, and the axis of the second fire outlet is vertical to the second annular side plate;

in the first direction, one end of the outer ring of the first annular side plate is positioned on the front side of one end of the inner ring of the first annular side plate; the first direction is parallel to the axis of the first annular side plate and is directed from the first surface of the top wall to the second surface of the top wall, the second surface being the other of the two opposing major surfaces of the top wall.

4. The fire cover of claim 3, wherein an end of the outer ring of the second annular side plate is located rearward of an end of the inner ring of the second annular side plate in the first direction.

5. The fire cover according to claim 4, wherein an acute angle among angles between an axis of the first fire outlet and an axis of the first annular side plate ranges from 20 ° to 45 °; and/or the range of an acute angle in an included angle between the axis of the second fire outlet and the axis of the second annular side plate is 20-45 degrees.

6. The fire cover according to any one of claims 1 to 5, wherein the first fire outlets are plural and are uniformly distributed along the circumferential direction of the top wall;

the second fire outlet is a plurality of, and is a plurality of the second fire outlet is along the circumference evenly distributed of roof.

7. The fire cover of claim 6, wherein each of the first fire outlets corresponds to one of the second fire outlets; the orthographic projection of the first fire outlets on a reference surface and the orthographic projection of the second fire outlets on the reference surface are staggered in the radial direction of the first annular bulge, and one second fire outlet corresponds to each two adjacent first fire outlets; the reference surface is a plane perpendicular to the axis of the first annular projection.

8. The fire cover according to claim 7, wherein the first fire outlet and the second fire outlet are both strip-shaped, an extension line of the orthographic projection of the first fire outlet on the reference surface in the length direction intersects with an extension line of the orthographic projection of the second fire outlet on the reference surface in the length direction, and an acute angle in an included angle between the two intersecting extension lines ranges from 45 ° to 60 °.

9. A burner is characterized by comprising a burner head, a main injection pipe, a secondary injection pipe and a fire cover, wherein the fire cover is the fire cover as claimed in any one of claims 1 to 8;

the furnace end is connected with the first annular bulge and the second annular bulge to form a first mixed air cavity; the furnace end is connected with the second annular bulge and the third annular bulge to form a second gas mixing cavity;

the first air mixing cavity is communicated with the secondary injection pipe, and the second air mixing cavity is communicated with the main injection pipe.

10. A gas burner comprising a burner as claimed in claim 9.

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