CN220355419U - Outer ring fire cover and combustor - Google Patents

Abstract

An outer ring fire lid and combustor, outer ring fire lid includes: the fire cover body is provided with an annular top wall, an inner annular wall and an outer annular wall, and an annular mixing cavity is formed among the annular top wall, the inner annular wall and the outer annular wall; the annular top wall is provided with fire outlets which are distributed at intervals along the circumferential direction and are communicated with the annular mixing cavity; the interval between a single fire outlet hole and the adjacent fire outlet hole closest to the fire outlet hole is L, the sum of the fire outlet areas of the two adjacent fire outlet holes forming the interval is S, and the ratio of the two is as follows: the ratio of the number of the fire holes in the ratio L/S is 0.4-1 to the total number of the fire holes in the 0.4-1, and the ratio of the fire holes in the inner fire outlet area to the fire holes in the outer fire outlet area is more than or equal to 70%. Compared with the prior art, the utility model can ensure the secondary air supplement of the fire hole of the inner ring.

Description

Outer ring fire cover and combustor

Technical Field

The utility model belongs to the technical field of household stoves, and particularly relates to an outer ring fire cover and a burner for a stove.

Background

The upper air inlet burner adopts a design with an upper nozzle for avoiding nozzle blockage caused by overflow, the injection pipe is transversely arranged at the bottom of the burner, and the length of the injection pipe is limited by the outer diameter of the burner and is smaller than that of a conventional injection pipe, so that the injection performance of the injection structure is weaker than that of a conventional lower air inlet structure.

In order to make up the problem of insufficient primary air of the upper air inlet burner, the applicant adopts a sheet metal porous form on the top wall of the outer ring fire cover, such as the patent application of the utility model with the application number of 201910647362.2 (application publication number of CN 112240548A), a fire hole formed by a thin sheet metal structure has the advantage of small air outlet resistance, and in addition, the fire cover in the porous form has the advantages of small aperture of a single fire hole and large total fire outlet area, so that the problem of insufficient primary air of the upper air inlet burner is relieved.

However, in actual use, secondary air on the inner side of the outer ring fire cover and secondary air on the outer side of the inner ring fire cover need to be supplemented to the inner ring fire cover and the outer ring fire cover at the same time, so that the problem of insufficient secondary air supplement at the fire holes (namely, the fire holes relatively close to the inner ring fire cover) on the inner ring of the outer ring fire cover exists in the patent application of the utility model.

Disclosure of Invention

The first technical problem to be solved by the utility model is to provide an outer ring fire cover aiming at the current state of the art so as to ensure secondary air filling of fire holes of an inner ring of the outer ring fire cover.

The second technical problem to be solved by the utility model is to provide a burner with the outer ring fire cover.

The technical scheme adopted by the utility model for solving the first technical problem is as follows: an outer ring fire cover, comprising:

the fire cover body is provided with an annular top wall, an inner annular wall extending downwards from the inner side edge of the annular top wall and an outer annular wall extending downwards from the outer side edge of the annular top wall, and an annular mixing cavity is formed among the annular top wall, the inner annular wall and the outer annular wall; the annular top wall is provided with fire outlets which are distributed at intervals along the circumferential direction and are communicated with the annular mixed air cavity; the fire outlet holes distributed at intervals in the circumferential direction are used as a group of fire outlet areas, and at least three groups of fire outlet areas are distributed at intervals along the radial direction of the annular top wall;

the method is characterized in that:

the interval between a single fire outlet hole and the adjacent fire outlet hole closest to the fire outlet hole is L, the sum of the fire outlet areas of the two adjacent fire outlet holes forming the interval is S, and the ratio of the two is as follows: the ratio of the number of the fire holes in the ratio L/S is 0.4-1 to the total number of the fire holes in the 0.4-1, and the ratio of the fire holes in the inner fire outlet area to the fire holes in the outer fire outlet area is more than or equal to 70%.

The above spacing refers to the distance between the edges of the believed two fire holes.

The fire outlet areas are formed by fire outlet holes which are distributed at intervals in the circumferential direction, and the fire outlet holes in the same fire outlet area can be distributed at equal intervals in the circumferential direction or at different intervals.

The two adjacent fire outlets may be circumferentially adjacent or radially adjacent.

The inner side and the outer side are relative to each other, and are not limited to the innermost side and the outermost side. And the L/S ratio of the fire outlet holes in the inner fire outlet area is larger than that of the fire outlet holes in the outer fire outlet area.

The ratio L/S is preferably greater than or equal to 93% of the number of fire holes to the total number of fire holes in the range of 0.4-1.

Therefore, compared with the fire outlet holes in the fire outlet region at the outer side, the sum of the fire outlet areas of the fire outlet holes at the inner side is smaller or the hole spacing is larger, and when the hole spacing between the fire outlet holes at the fire outlet region at the inner side is larger, the secondary air can smoothly flow along the spacing, so that sufficient secondary air can be ensured around the fire outlet holes at the fire outlet region at the inner side, the secondary air can be smoothly fed in from the peripheral edges of the fire holes, and further, the smoke generated during combustion can be reduced, and the combustion efficiency is improved; when the sum of the fire outlet areas of the fire outlet holes in the inner fire outlet area is smaller, less secondary air is needed for combustion, and external secondary air is sufficient to be fed into the fire outlet holes in the inner fire outlet area, so that smoke generated during combustion can be reduced, and the combustion efficiency is improved.

When the ratio L/S is smaller than 0.4, the space between the fire holes is too small or the area of a single fire hole is too large, and when the space between the fire holes is too small, the secondary air channel is too small to support secondary air supplement around the fire holes in the combustion process; when the area of a single fire outlet hole is too large, too much secondary air is needed for combustion, and the problem that the secondary air cannot be fully supplemented is also caused.

When the ratio L/S is larger than 1, the flame interval is overlarge because of overlarge flame hole interval or overlarge flame hole area, and when the flame hole interval is overlarge, the flame interval is overlarge, so that unstable combustion is caused, the flame is scattered, excessive heat is dissipated, and the combustion efficiency is reduced; when the area of a single fire outlet hole is too small, the flame is smaller, and the condition of fire escape is easy to occur.

In the utility model, when the ratio of the number of fire holes to the total number of fire holes meeting the ratio L/S of 0.4-1 is lower than 70%, namely, more than 30% of the fire holes are arranged to not meet the requirement, the air flowing to the inner side of the fire cover cannot meet the requirement of full combustion of the fire holes on the inner side, so that insufficient combustion is caused.

In summary, the utility model can ensure that the fire outlet holes, especially the fire outlet holes positioned in the inner fire outlet area, have sufficient secondary air, thereby reducing the smoke generated during combustion and improving the combustion efficiency.

Preferably, the annular top wall slopes downwardly from inside to outside. The inclined annular top wall has the following technical effects: 1. under the condition that the diameter of the fire cover is fixed, more fire outlet holes can be formed in the obliquely arranged annular top wall relative to the planar annular top wall, so that a large fire outlet area is ensured; 2. the outer side edge of the annular top wall is lower in height, so that the overall height of the burner can be reduced; 3. the air flows upwards after being heated, the annular top wall which is obliquely arranged is beneficial to secondary air from outside to inside, so that secondary air supplement at the fire outlet hole on the inner ring of the outer ring fire cover and the fire outlet hole of the inner ring fire cover is smoother, and the combustion efficiency is higher.

Preferably, the included angle between the annular top wall and the horizontal plane is 20-45 degrees.

Further, the annular top wall is in the shape of a side peripheral wall of a round table with a small upper part and a large lower part. That is, each fire hole is positioned on the side peripheral surface of the same round table, so that each fire hole can be ensured to better contact secondary air, and the contact area between flame and secondary air is increased.

In order to further increase the contact area of the flame with the secondary air, it is preferable that the axis of the flame exit hole is perpendicular to the annular top wall.

Further, the included angle between the axis of the fire outlet hole and the horizontal plane is 45-70 degrees.

In order to ensure that secondary air is complemented and meanwhile, the secondary air can avoid flame separation, at least 15 fire outlets which are arranged continuously in the circumferential direction are preferably arranged in a group, 4-7 groups are arranged at intervals along the radial direction of the annular top wall, and the interval between every two adjacent fire outlets in each group is 1-2 mm. Thus, the following technical effects can be achieved: 1. the number and the distribution mode of the fire holes enable the annular top wall to be in a porous form with dense fire holes distributed, so that a large fire area can be realized, and the air outlet and the heating are uniform; 2. the distance between two adjacent fire outlets is designed to be 1-2 mm, so that secondary air supplement is ensured to be sufficient, and fire transmission can be realized; 3. according to the utility model, the number and the distribution mode of the fire holes enable the gas outflow speed of each fire hole not to be too high, so that the combustion of the gas is stable; and the flame at each fire hole can effectively pull the flame of the adjacent fire hole, thereby realizing self-flame stabilization.

In each of the above embodiments, preferably, the flame exit hole is integrally located at an inner portion of the annular top wall in a radial direction to form a flame zone, and an outer portion of the annular top wall forms a circle of flame exit-free zone without flame holes. In the use process, the whole fire cover is in a high-temperature state, the temperature of the fire-free area at the outer side is very high, and secondary air flows to the flame area through the fire-free area, so that the secondary air can be fully guided and preheated.

If the size of the fire-discharging area is too large, excessive remained gas below the outer ring fire cover can exist when the fire is closed, and the phenomenon of fire closing and detonating occurs; if the size of the fire-out area is too large, the temperature of the outermost area of the fire cover is relatively low, and the combustion stability is relatively poor, so that the flame-out holes in the outer ring are easy to generate flame-out; if the size of the no-fire area is too small, the secondary air cannot be preheated well, so in order to overcome the technical problem, preferably, the width of the no-fire area in the radial direction projected on the horizontal plane accounts for 12-62% of the width of the annular top wall in the radial direction projected on the horizontal plane. Therefore, firstly, the phenomenon that excessive residual gas exists below the fire-free area and fire-closing and detonating occur due to the fact that the fire-free area is too large in size can be avoided; 2. the secondary air can flow along the radial direction of the fire-free area when being supplemented, so that better diversion and preheating effect can be obtained, and if the size of the fire-free area is too small, the secondary air can not be better preheated and diversion when being supplemented; 3. for the upper air inlet burner, the air outlet end of the injection pipe extends into the air mixing chamber below the outer ring fire cover along the horizontal direction generally, and in order to ensure the air mixing uniformity, the air outlet end of the injection pipe is not opposite to the fire outlet hole, so that the gas and the air output from the injection pipe can be uniformly mixed in the air mixing chamber; 4. can ensure the overall temperature of the fire cover to be higher and avoid flame separation.

The utility model solves the second technical problem by adopting the technical proposal that: a burner characterized by having an outer annular fire cover as described above.

Preferably, the burner is further provided with an inner ring fire cover, the inner ring fire cover is arranged on the inner periphery of the inner ring wall of the outer ring fire cover, the inner ring fire cover is provided with a vertical extending peripheral wall, the peripheral wall is opposite to the inner ring wall of the outer ring fire cover, inner ring main fire holes are arranged at intervals along the circumferential direction, the aperture of each inner ring main fire hole is larger than or equal to 1.8mm, and the upper limit of the aperture value of each inner ring main fire hole is 3mm.

Preferably, at least an upper portion of the inner annular wall of the outer annular fire cover is inclined inwardly from top to bottom to form a deflector wall, and an upper edge of the deflector wall is engaged with an inner edge of the annular top wall. The arrangement of the guide wall can guide the secondary air positioned in the inner ring of the outer ring fire cover, so that the secondary air can smoothly flow to the fire outlet.

In order to further avoid that the flame at the inner ring flame holes burns to the guide wall, preferably, the lower edge of the inner ring flame holes is higher than the lower edge of the guide wall;

the included angle between the axis of the inner ring fire hole and the horizontal plane is larger than the included angle between the guide wall and the horizontal plane. Thereby further avoiding the flame at the fire hole of the inner ring from burning to the guide wall.

Preferably, the burner is for a kitchen range.

The burner is preferably an upper air intake burner. Of course, the burner can also be a lower air inlet burner.

Compared with the prior art, the utility model has the advantages that: the ratio L/S of the interval L between two adjacent fire outlets and the sum S of the fire outlet areas of the two adjacent fire outlets forming the interval is designed to be 0.4-1, and the ratio of the fire outlets in the inner fire outlet area is larger than that of the fire outlets in the outer fire outlet area, namely, compared with the fire outlets in the outer fire outlet area, the sum of the fire outlet areas of the fire outlets in the inner fire outlet area is smaller or the hole interval is larger, and when the hole interval between the fire outlets in the inner fire outlet area is larger, secondary air can smoothly flow along the interval, so that sufficient secondary air can be ensured to smoothly supplement from the periphery of the fire outlets in the inner fire outlet area, and further, the smoke generated during combustion can be reduced, and the combustion efficiency is improved; when the sum of the fire outlet areas of the fire outlet holes in the inner fire outlet area is smaller, less secondary air is needed for combustion, and external secondary air is sufficient to be fed into the fire outlet holes in the inner fire outlet area, so that smoke generated during combustion can be reduced, and the combustion efficiency is improved.

When the ratio L/S is smaller than 0.4, the space between the fire holes is too small or the area of a single fire hole is too large, and when the space between the fire holes is too small, the secondary air channel is too small to support secondary air supplement around the fire holes in the combustion process; when the area of a single fire outlet hole is too large, too much secondary air is needed for combustion, and the problem that the secondary air cannot be fully supplemented is also caused.

When the ratio L/S is larger than 1, the flame interval is overlarge because of overlarge flame hole interval or overlarge flame hole area, and when the flame hole interval is overlarge, the flame interval is overlarge, so that unstable combustion is caused, the flame is scattered, excessive heat is dissipated, and the combustion efficiency is reduced; when the area of a single fire outlet hole is too small, the flame is smaller, and the condition of fire escape is easy to occur.

In the utility model, when the ratio of the number of fire holes to the total number of fire holes meeting the ratio L/S of 0.4-1 is lower than 70%, namely, more than 30% of the fire holes are arranged to not meet the requirement, the air flowing to the inner side of the fire cover cannot meet the requirement of full combustion of the fire holes on the inner side, so that insufficient combustion is caused.

In summary, the utility model can ensure that the fire outlet holes, especially the fire outlet holes positioned in the inner fire outlet area, have sufficient secondary air, thereby reducing the smoke generated during combustion and improving the combustion efficiency.

Drawings

FIG. 1 is a schematic view of a burner according to a first embodiment of the present utility model;

FIG. 2 is a cross-sectional view of a burner in accordance with a first embodiment of the present utility model;

FIG. 3 is a top view of an outer ring fire cover according to a first embodiment of the utility model;

FIG. 4 is a cross-sectional view of an outer ring fire cover in accordance with an embodiment of the utility model;

fig. 5 is a schematic structural view of an outer ring fire cover in a second embodiment of the utility model.

Detailed Description

The utility model is described in further detail below with reference to the embodiments of the drawings.

Embodiment one:

as shown in fig. 1 to 4, a preferred embodiment of an outer ring fire cover and a burner of the present utility model is an upper air intake burner for a kitchen range, and the burner comprises a base 3, an outer ring fire cover and an inner ring fire cover 2.

The base 3 is a prior art, and has an inner ring air-mixing chamber 31 with an opening facing upwards, and an outer ring air-mixing chamber 32 located at the periphery of the inner ring air-mixing chamber 31 in the circumferential direction.

The inner ring fire cover 2 is arranged on the inner ring gas mixing chamber 31 in a covering way, and is provided with a vertical extending circumferential wall 21, inner ring main fire holes 210 are arranged on the circumferential wall 21 at intervals along the circumferential direction, and the aperture of each single inner ring main fire hole 210 is 1.8-3 mm (the aperture of each single inner ring main fire hole 210 can be any value of 1.8-3 mm, for example, the aperture of each single inner ring main fire hole 210 can be 1.8mm, 2mm or 3 mm).

The outer ring fire cover is arranged on the outer ring gas mixing chamber 32 and comprises a fire cover body 1, wherein the fire cover body 1 is provided with an annular top wall 11, an inner ring wall 12 extending downwards from the inner side edge of the annular top wall 11 and an outer ring wall 13 extending downwards from the outer side edge of the annular top wall 11, and an annular gas mixing chamber 10 with a downward opening is formed among the annular top wall 11, the inner ring wall 12 and the outer ring wall 13. In this embodiment, the annular top wall 11 of the outer ring fire cover is inclined from inside to outside downward, and the included angle between the annular top wall 11 and the horizontal plane is 20-45 ° (the included angle may be any value of 20-45 ° (e.g., the included angle may be 20 °, 30 ° or 45 °), and the annular top wall 11 is in the shape of a side peripheral wall of a truncated cone with a small top and a large bottom. The inner annular wall 12 of the outer annular fire cover is located on the periphery of the peripheral wall 21 of the inner annular fire cover 2 and is spaced apart from the peripheral wall 21. And the upper part of the inner ring wall 12 is inclined inwards from top to bottom to form a guide wall 121, and the included angle between the guide wall 121 and the horizontal plane is smaller than the included angle between the axis of the inner ring main fire hole 210 and the horizontal plane. At the same time, the upper edge of the deflector wall 121 engages with the inner edge of the annular top wall 11. The lower edge of the guide wall 121 is located at a lower level than the lower edge of the inner ring main fire hole 210. So that the flames at the inner ring main fire holes 210 can be prevented from burning to the guide wall 121.

Meanwhile, the inner side of the annular top wall 11 in the radial direction is provided with flame outlets 110 which are circumferentially spaced apart and communicate with the annular mixing chamber 10 to form a flame zone 11a. The outer side of the annular top wall 11 forms a circle of fireless zones 11b without fire holes. The width of the no-fire zone 11b in the radial direction projected on the horizontal plane accounts for 12 to 62% of the width of the annular top wall 11 in the radial direction projected on the horizontal plane (the width of the no-fire zone 11b may be any value of 12 to 62%, for example, the width of the no-fire zone 11b may be 12%, 20%, 40%, 50% or 62%). In this way, secondary air can flow radially to the flame zone 11a along the no-fire zone 11b upon replenishment, and sufficient preheating can be obtained. The axis of each of the flame holes 110 in the flame zone 11a is perpendicular to the annular top wall 11. At least 15 fire outlets 110 distributed at intervals in the circumferential direction are used as a group of fire outlet areas, 4-7 groups are arranged, and the fire outlet areas are distributed at intervals along the radial direction of the annular top wall 11 (a plurality of fire outlets 110 positioned on the same circumferentially extending dash-dot line 100 in the partial enlarged view of fig. 3 form the fire outlet areas, and the fire outlet areas have 6 groups); the interval distance between two adjacent fire outlets 110 in each group is 1-2 mm, the interval between a single fire outlet and the radially adjacent fire outlet closest to the fire outlet is L, the sum of the fire outlet areas of two adjacent fire outlets forming the interval is S, and the ratio of the two is as follows: L/S is 0.4 to 1 (the ratio L/S may be any value from 0.4 to 1, such as the ratio L/S may be 0.4, 0.6 or 0.8). The ratio L/S is more than or equal to 70% of the ratio of the number of fire holes 110 to the total number of all fire holes 110, wherein the ratio L/S is between 0.4 and 1. Meanwhile, the distance between the single fire outlet hole in the inner fire outlet area and the fire outlet hole radially adjacent to the single fire outlet hole is larger than the distance between the single fire outlet hole in the outer fire outlet area and the fire outlet hole radially adjacent to the fire outlet hole, so that the ratio of the fire outlet holes in the inner fire outlet area is larger than the ratio of the fire outlet holes in the outer fire outlet area. Therefore, the sufficient secondary air can be ensured around the fire outlet hole, especially the fire outlet hole positioned at the inner ring, and the smoke generated during combustion can be reduced, so that the combustion efficiency is improved.

Embodiment two:

as shown in fig. 5, in a second preferred embodiment of the outer ring fire cover and the burner according to the present utility model, the first preferred embodiment is basically the same as the first preferred embodiment, except that the fire outlet area of the single fire outlet hole in the inner fire outlet region is smaller than the fire outlet area of the single fire outlet hole in the outer fire outlet region in the present preferred embodiment, so that the ratio of the fire outlet holes in the inner fire outlet region is greater than the ratio of the fire outlet holes in the outer fire outlet region.

In the description and claims of the present utility model, terms indicating directions, such as "front", "rear", "upper", "lower", "left", "right", "side", "top", "bottom", etc., are used to describe various example structural parts and elements of the present utility model, but these terms are used herein for convenience of description only and are determined based on the example orientations shown in the drawings. Because the disclosed embodiments of the utility model may be arranged in a variety of orientations, the directional terminology is used for purposes of illustration and is in no way limiting, such as "upper" and "lower" are not necessarily limited to being in a direction opposite or coincident with the direction of gravity.

The term "vertical" is also used in the present description and claims to mean substantially in the vertical direction, not limited to only the vertical direction, but also slightly inclined with respect to the vertical direction.

The term "radial" is also used in the present description and claims to mean substantially in an inward-outward direction, not limited to a radial direction only through the center of a circle, but also slightly offset from the radial direction.

Claims (13)

1. An outer ring fire cover, comprising:

the fire cover body (1) is provided with an annular top wall (11), an inner annular wall (12) and an outer annular wall (13), and an annular mixing cavity (10) is formed among the annular top wall (11), the inner annular wall (12) and the outer annular wall (13); the annular top wall (11) is provided with fire outlets (110) which are distributed at intervals along the circumferential direction and are communicated with the annular mixing cavity (10); the fire outlet holes (110) distributed at intervals in the circumferential direction are used as a group of fire outlet areas, at least three groups of fire outlet areas are distributed at intervals along the radial direction of the annular top wall (11);

the method is characterized in that:

the interval between a single fire outlet hole and the adjacent fire outlet hole closest to the fire outlet hole is L, the sum of the fire outlet areas of the two adjacent fire outlet holes forming the interval is S, and the ratio of the two is as follows: the ratio of the number of the fire outlet holes (110) to the total number of the fire outlet holes (110) in the ratio L/S of 0.4-1 is more than or equal to 70%.

2. An outer ring fire cover as claimed in claim 1 wherein: the annular top wall (11) is inclined downwards from inside to outside;

and the included angle between the annular top wall (11) and the horizontal plane is 20-45 degrees.

3. An outer ring fire cover as claimed in claim 2 wherein: the annular top wall (11) is integrally in the shape of a side peripheral wall of a truncated cone with a small upper part and a large lower part.

4. An outer ring fire cover as claimed in claim 2 wherein: the axis of the fire outlet hole (110) is perpendicular to the annular top wall (11).

5. An outer ring fire cover as claimed in claim 1 wherein: the included angle between the axis of the fire outlet hole (110) and the horizontal plane is 45-70 degrees.

6. An outer ring fire cover according to any one of claims 1 to 5 wherein: at least 15 fire holes (110) which are arranged continuously in the circumferential direction are arranged in a group, 4-7 groups are arranged at intervals along the radial direction of the annular top wall (11), and the interval between every two adjacent fire holes (110) in each group is 1-2 mm.

7. The outer ring fire cover of claim 6 wherein: the flame outlet (110) is integrally located at the inner part of the annular top wall (11) in the radial direction to form a flame zone (11 a), and the outer part of the annular top wall (11) forms a circle of flame zone (11 b) without flame holes.

8. The outer ring fire cover of claim 7 wherein: the radial width of the projection of the non-ignition area (11 b) on the horizontal plane is 12-62% of the radial width of the projection of the annular top wall (11) on the horizontal plane.

9. A burner having an outer annular fire cover as claimed in any one of claims 1 to 8.

10. The burner of claim 9, wherein: the inner ring fire cover (2) is arranged on the inner periphery of the inner ring wall (12), the inner ring fire cover (2) is provided with a vertical extending peripheral wall (21), the peripheral wall (21) is opposite to the inner ring wall (12), inner ring main fire holes (210) are arranged at intervals along the circumferential direction, and the aperture of each inner ring main fire hole (210) is 1.8-3 mm.

11. The burner of claim 10, wherein: the inner annular wall (12) extends downwards from the inner side edge of the annular top wall (11), at least the upper part of the inner annular wall (12) is inclined inwards from top to bottom to form a guide wall (121), and the upper edge of the guide wall (121) is connected with the inner side edge of the annular top wall (11).

12. The burner of claim 11, wherein: the lower edge of the inner ring main fire hole (210) is higher than the lower edge of the guide wall (121);

the included angle between the axis of the inner ring main fire hole (210) and the horizontal plane is larger than the included angle between the guide wall (121) and the horizontal plane.

13. The burner of claim 9, wherein: the burner is an upper air inlet burner and is used for a kitchen range.