CN110594734B

CN110594734B - Outer ring fire cover, burner and working method thereof

Info

Publication number: CN110594734B
Application number: CN201910881284.2A
Authority: CN
Inventors: 卢楚鹏; 林刚
Original assignee: Guangdong Vanward New Electric Co Ltd
Current assignee: Guangdong Vanward New Electric Co Ltd
Priority date: 2019-09-18
Filing date: 2019-09-18
Publication date: 2024-04-16
Anticipated expiration: 2039-09-18
Also published as: CN110594734A

Abstract

The invention relates to an outer ring fire cover, a burner and a working method thereof. On the one hand, be provided with more than 5 rows of fire holes on the outer convex surface, on the outer loop fire lid of equal diameter size, arrange more fire holes, be equivalent to increasing the heat transfer area, can realize the high temperature combustion area of large tracts of land, improved thermal efficiency, the gas combustion is more abundant. In addition, as the number of the fire holes on the outer convex surface is more than 5, the fuel gas is uniformly distributed to each fire hole to form a wider high-temperature combustion area, the narrow high-temperature combustion area with only one row of fire holes is improved, the high-temperature heat exchange area is increased, and the heat exchange efficiency is improved. On the other hand, the diameter of the fire hole is set to be 1.4-1.7 mm, the distance between the edges of adjacent fire holes is 1.2-2 times of the diameter of the fire hole, and the fire hole is matched with atmospheric combustion, so that the head pressure of the outer ring fire cover can be reduced, the tempering limit can be correspondingly increased, and the wall thickness of the outer ring fire cover can be further reduced, thereby saving materials and reducing the cost of the device.

Description

Outer ring fire cover, burner and working method thereof

Technical Field

The invention relates to the technical field of stoves, in particular to an outer ring fire cover, a burner and a working method thereof.

Background

Conventional burners include an outer ring fire cover. The outer surface side of the outer ring fire cover is generally provided with two circumferential rows of holes, wherein one row of holes is a main fire hole (main fire hole), and the other row of holes is a flame stabilizing hole (or a flame stabilizing groove). The cooking is used to big fire quick-frying, so that the power of the kitchen range is larger. In order to increase the combustion power, it is generally required to increase the area of the fire hole, and the size of the fire hole is mainly increased in the market at present, that is, the fire hole with the aperture of more than 2.4mm is opened. In order to avoid tempering, the depth of the fire hole needs to be increased, so that the thickness of the fire cover is larger, and the material cost is greatly increased. In addition, the main fire hole firepower is increased once, so that firepower of the position, close to the main fire holes of the inner ring and the outer ring, of the bottom of the cooker is strong, the bottom of the cooker is heated unevenly, and the cooking effect of food is affected.

Disclosure of Invention

The first technical problem to be solved by the invention is to provide an outer ring fire cover which can effectively improve tempering limit, reduce device cost, ensure uniform combustion effect and ensure good combustion effect.

The second technical problem to be solved by the invention is to provide a burner which can effectively improve the tempering limit, reduce the device cost, ensure a relatively uniform combustion effect and ensure a relatively good combustion effect.

The third technical problem to be solved by the invention is to provide a working method of the burner, which can effectively improve the tempering limit, reduce the device cost, ensure the relatively uniform combustion effect and ensure the relatively good combustion effect.

The first technical problem is solved by the following technical scheme:

an outer ring fire cover comprising: the body, the body is annular setting, be equipped with outer bellying between the inner peripheral edge of body and the peripheral edge, outer bellying is followed the air inlet side of body goes out the fireside protrusion, so as to be in the air inlet side of body forms outer burning space, be provided with more than 5 rows of fire holes of circumference on the outer convex surface of outer bellying interval, the diameter of fire hole is 1.4mm ~ 1.7mm, adjacent the distance between the edge of fire hole is 1.2 ~ 2 times of the diameter of fire hole.

Compared with the background technology, the outer ring fire cover has the beneficial effects that:

on the one hand, be provided with more than 5 rows of fire holes on the outer convex surface, on the outer loop fire lid of equal diameter size, arrange more fire holes, be equivalent to increasing heat transfer area, so can realize the high temperature combustion area of large tracts of land, improved thermal efficiency, the gas combustion is more abundant. In addition, as the number of the fire holes on the outer convex surface is more than 5, the fuel gas is uniformly distributed to each fire hole to form a wider high-temperature combustion area, the narrow high-temperature combustion area with only one row of fire holes is improved, the high-temperature heat exchange area is increased, and the heat exchange efficiency is improved. The fire holes of more than 5 rows can evenly distribute fire power to solve the fire power and concentrate on main fire hole, the inhomogeneous problem of being heated of pan bottom. On the other hand, the fire hole is combined with more than 5 rows of fire holes, the diameter of the fire holes is set to be 1.4-1.7 mm, the distance between the edges of the adjacent fire holes is 1.2-2 times of the diameter of the fire holes, and the fire hole is matched with atmospheric combustion with larger primary air coefficient (for example, the primary air coefficient is 0.6, 0.7 or 0.8), so that the head pressure of the outer ring fire cover can be reduced, the tempering limit can be correspondingly increased, the wall thickness of the outer ring fire cover can be further reduced, the material is saved, and the device cost is reduced.

In one embodiment, the fire hole has a depth of 2.5mm to 3mm. Thus, as the tempering limit of the outer ring fire cover in the embodiment is larger, tempering can be avoided when the wall thickness of the outer ring fire cover is 2.5-3 mm, and the wall thickness of the outer ring fire cover is thinner, so that materials can be saved, and the cost of the device can be reduced.

In one embodiment, the diameter of the fire hole is 1.5 mm-1.6 mm, and the distance between the edges of adjacent fire holes is 1.4 times-1.6 times the diameter of the fire hole. Therefore, while ensuring larger firepower, the bad phenomenon of tempering caused by overlarge diameter of the fire hole can be avoided, and the bad phenomenon of overhigh smoke caused by overlarge diameter of the fire hole can be avoided. In addition, combine in 1.5mm ~ 1.6 mm's fire hole aperture, fire hole edge interval sets up comparatively appropriately, and the fire effect that passes is better, and the combustion effect presents flame graininess, and can avoid on the one hand leading to fire effect relatively poor owing to the fire hole edge interval is great, on the other hand can avoid leading to the flue gas relatively high owing to the fire hole edge interval is less.

In one embodiment, when the body is placed normally and horizontally, a distance L1 between the edge of the fire hole of the innermost row and the inner peripheral edge of the body in the horizontal direction is 0.4mm to 2mm, and a distance L2 between the edge of the fire hole of the outermost row and the outer peripheral edge of the body in the horizontal direction is 0.4mm to 2mm.

In one embodiment, the fire holes of adjacent rows are equally spaced on the outer convex surface; the number of rows of fire holes on the outer convex surface is 5-8 rows. Therefore, the number of the fire holes on the outer convex surface is 5-8, so that the fuel gas is uniformly distributed to each fire hole to form a wider high-temperature combustion area, the narrow high-temperature combustion area with only one row of fire holes is improved, the high-temperature heat exchange area is increased, and the heat exchange efficiency is improved. The fire holes with 5-8 rows can uniformly distribute fire power, and the bottom of the cooker can be uniformly heated.

In one embodiment, the fire holes of adjacent rows are arranged in a staggered manner; the number of fire holes in each row is the same. So, the fire hole evenly arranges on outer convex surface, realizes evenly distributed firepower, realizes burning more abundant, and the combustion effect is better, also can realize that the pan bottom is heated evenly.

In one embodiment, the connecting lines of the centers of any two adjacent three fire holes on the outer convex surface are in an equilateral triangle shape. So, the fire hole evenly arranges on outer convex surface, realizes evenly distributed firepower, realizes burning more abundant, and the combustion effect is better, also can realize that the pan bottom is heated evenly.

In one embodiment, the diameter of the peripheral edge of the body is 90mm to 120mm.

The second technical problem is solved by the following technical scheme:

the burner comprises the outer ring fire cover, a burner and an inner fire cover; the furnace end is provided with an outer combustion chamber, and the outer combustion space of the body is communicated with the outer combustion chamber; the furnace end is also provided with an internal combustion air cavity, the internal combustion air cavity and the external combustion air cavity are mutually independent, and the external combustion air cavity is wound on the periphery of the internal combustion air cavity; the air inlet side of the inner fire cover is communicated with the inner combustion chamber; the burner is also provided with two gas interfaces, one of which is communicated with the internal combustion chamber and the other of which is communicated with the external combustion chamber; the gas interface is provided with a primary air coefficient adjusting piece.

Compared with the background technology, the burner provided by the invention has the beneficial effects that:

The third technical problem is solved by the following technical scheme:

a method of operating a burner as described, comprising the steps of: the primary air coefficient adjusting piece corresponding to the outer fire cover is adjusted to enable the primary air coefficient to be 0.6-0.8.

Compared with the background technology, the working method of the burner has the beneficial effects that:

Drawings

FIG. 1 is a top view of an outer ring fire cover according to an embodiment of the invention;

FIG. 2 is a cross-sectional view at A-A of FIG. 1;

FIG. 3 is a cross-sectional view of FIG. 1 at B-B;

FIG. 4 is a top view of a burner according to an embodiment of the present invention;

FIG. 5 is an exploded view of a burner according to an embodiment of the present invention;

FIG. 6 is an exploded cross-sectional view of a burner according to an embodiment of the present invention;

FIG. 7 is a schematic view showing a state in which the primary air-factor adjusting member is adjusted to a maximum opening degree according to an embodiment of the present invention;

FIG. 8 is a schematic view illustrating a state in which the primary air-factor adjusting member is adjusted to a medium opening degree according to an embodiment of the present invention;

fig. 9 is a schematic diagram illustrating a state in which the primary air-factor adjusting member is adjusted to a minimum opening degree according to an embodiment of the present invention.

Reference numerals:

10. an outer ring fire cover; 11. a body; 111. an inner peripheral edge; 112. a peripheral edge; 113. an external combustion space; 114. an outer convex surface; 1141. an inner end surface; 1142. an outer end surface; 115. a fire hole; 116. a step position; 12. a support plate; 20. a burner; 21. an outer combustion chamber; 22. an internal combustion air chamber; 23. a gas interface; 30. an inner fire cover; 40. a primary air-factor adjusting member; 41. a bottom plate; 42. an adjusting plate; 43. a gas hole; 44. an air inlet.

Detailed Description

In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the invention, whereby the invention is not limited to the specific embodiments disclosed below.

In the description of the present invention, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the description of the present invention, it will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly connected" to another element, there are no intervening elements present.

In one embodiment, referring to fig. 1 and 2, an outer ring fire cover 10 includes a body 11. The body 11 is annular, and an outer protruding portion is arranged between an inner peripheral edge 111 and an outer peripheral edge 112 of the body 11. The outer protrusion protrudes from the air inlet side of the body 11 toward the fire outlet side to form an outer combustion space 113 on the air inlet side of the body 11, and more than 5 circumferential rows of fire holes 115 are provided on the outer protrusion surface 114 at intervals. The diameter of the fire hole 115 is 1.4mm to 1.7mm, and the distance between the edges of adjacent fire holes 115 is 1.2 times to 2 times the diameter of the fire hole 115.

It will be appreciated that the body 11 has an air inlet side and a fire outlet side disposed opposite each other in the axial direction, and the fire hole 115 penetrates the air inlet side and the fire outlet side of the body 11, so that the fuel gas on the air inlet side of the body 11 can be ejected to the fire outlet side through the fire hole 115 for combustion. The outer ring fire cover 10 is generally horizontally disposed with the air inlet side facing downward and the fire outlet side facing upward, and the body 11 has an outer protrusion protruding upward, so that an upwardly concave outer combustion space 113 is formed at the lower side of the body 11, and the fire hole 115 is disposed on the outer protrusion, so that the outer combustion space 113 communicates with the fire outlet side through the fire hole 115.

On the one hand, the outer ring fire cover 10 is provided with more than 5 rows of fire holes 115 on the outer convex surface 114, and more fire holes 115 are arranged on the outer ring fire cover 10 with the same diameter, which is equivalent to increasing the heat exchange area, so that a large-area high-temperature combustion area can be realized, the heat efficiency is improved, and the gas combustion is more sufficient. In addition, since the number of rows of fire holes 115 on the outer convex surface 114 is more than 5, the fuel gas is uniformly distributed to each fire hole 115 to form a wider high-temperature combustion area, thereby improving the narrow high-temperature combustion area with only one row of fire holes 115, increasing the high-temperature heat exchange area and improving the heat exchange efficiency. The fire holes 115 with more than 5 rows can uniformly distribute fire power so as to solve the problem that the fire power is concentrated on the main fire holes 115 and the bottom of the cooker is heated unevenly. On the other hand, in combination with more than 5 rows of fire holes 115, the diameter of the fire holes 115 is set to be 1.4 mm-1.7 mm, the distance between the edges of adjacent fire holes 115 is 1.2-2 times the diameter of the fire holes 115, and the fire holes are matched with atmospheric combustion with larger primary air coefficient (for example, the primary air coefficient is 0.6, 0.7 or 0.8), so that the head pressure of the outer ring fire cover 10 can be reduced, the tempering limit can be correspondingly increased, the wall thickness of the outer ring fire cover 10 can be further reduced, the materials are saved, and the device cost is reduced.

Further, referring to fig. 1 to 6, the inner end surface 1141 and the outer end surface 1142 are both annular curved surfaces, and the outer peripheral edge of the inner end surface 1141 is connected to the inner peripheral edge of the outer end surface 1142. The radius of curvature of the inner end surface 1141 is 0.7 to 0.75 times the radius of curvature of the outer end surface 1142.

Specifically, the diameter of the outer peripheral edge 112 of the body 11 is 90mm to 120mm.

In one embodiment, the fire holes 115 have a depth of 2.5mm to 3mm. Thus, since the tempering limit of the outer ring fire cover 10 in the above embodiment is relatively large, tempering can be avoided when the wall thickness of the outer ring fire cover 10 is 2.5 mm-3 mm, the wall thickness of the outer ring fire cover 10 is relatively thin, materials can be saved, and the cost of the device can be reduced.

In one embodiment, the fire holes 115 have a diameter of 1.5mm to 1.6mm, and the distance between the edges of adjacent fire holes 115 is 1.4 times to 1.6 times the diameter of the fire holes 115. Thus, while ensuring larger firepower, the bad phenomenon of tempering caused by overlarge diameter of the fire hole 115 can be avoided, and the bad phenomenon of too high smoke caused by overlarge diameter of the fire hole 115 can be avoided. In addition, combine in 1.5mm ~ 1.6 mm's fire hole 115 aperture, fire hole 115 edge interval sets up comparatively properly, and the fire effect is better, and the combustion effect presents the flame graininess, and can avoid on the one hand because fire hole 115 edge interval is great to lead to fire effect relatively poor, on the other hand can avoid leading to the flue gas relatively high because fire hole 115 edge interval is less.

In one embodiment, adjacent rows of the fire holes 115 are equally spaced on the outer convex surface 114; the number of rows of fire holes 115 on the outer convex surface 114 is 5 to 8. In this way, since the number of rows of fire holes 115 on the outer convex surface 114 is 5-8, the fuel gas is uniformly distributed to each fire hole 115 to form a wider high-temperature combustion area, thereby improving the narrow high-temperature combustion area with only one row of fire holes 115, increasing the high-temperature heat exchange area and improving the heat exchange efficiency. The fire holes 115 with 5-8 rows can uniformly distribute fire power, and can realize uniform heating of the bottom of the cooker.

In one embodiment, adjacent rows of the fire holes 115 are offset from each other; the number of fire holes 115 in each row is the same. In this way, the fire holes 115 are uniformly arranged on the outer convex surface 114, so that the fire power is uniformly distributed, the combustion is more complete, the combustion effect is better, and the bottom of the cooker is uniformly heated.

In one embodiment, the lines of centers of any two adjacent three fire holes 115 on the outer convex surface 114 are in an equilateral triangle shape. In this way, the fire holes 115 are uniformly arranged on the outer convex surface 114, so that the fire power is uniformly distributed, the combustion is more complete, the combustion effect is better, and the bottom of the cooker is uniformly heated.

Further, referring to fig. 1 to 6, the outer convex surface 114 of the outer convex portion includes an inner end surface 1141 facing the center of the body 11 and an outer end surface 1142 facing away from the center of the body 11. The outer end surface 1142 is disposed on the outer periphery of the inner end surface 1141, the inner end surface 1141 and the outer end surface 1142 are provided with more than two circumferential rows of fire holes 115, the total area of all the fire holes 115 on the outer end surface 1142 is 1.5-3 times the total area of all the fire holes 115 on the inner end surface 1141, and the radius of curvature of the inner end surface 1141 is 0.3-0.8 times the radius of curvature of the outer end surface 1142. In this way, the total area of all fire holes 115 on the outer end surface 1142 is 1.5-3 times that of all fire holes 115 on the inner end surface 1141, the curvature radius of the inner end surface 1141 is 0.3-0.8 times that of the outer end surface 1142, the fire holes 115 of the outer end surface 1142 are arranged outwards, the fire holes 115 of the inner end surface 1141 are arranged inwards, and the outer end surface 1142 and the inner end surface 1141 are both provided with more than two rows of fire holes 115, so that a large-area high-temperature combustion area can be realized, more fire holes 115 can be arranged on the outer ring fire cover 10 with the same diameter, the heat exchange area is increased equivalently, the heat efficiency is improved, and the gas combustion is more sufficient.

In one embodiment, referring to fig. 1 to 6, the radius of curvature of the inner end surface 1141 is 7mm to 9mm; the radius of curvature of the outer end surface 1142 is 10mm to 12mm. Thus, when the curvature of the outer convex surface 114 of the outer ring fire cover 10 with the same inner and outer diameters is larger, the generated arc length is longer, the interval between the fire holes 115 can be larger, the flames are easier to form flame particles, the flames of each row of fire holes 115 are distinct, the combustion is more complete, and the content of harmful substances co in generated smoke is lower; when the curvature is small, flames generated by the fire holes 115 are easy to be connected to form a flame group, only one layer of flames is insufficient in combustion, and the content of harmful substances co in generated smoke is relatively high.

In one embodiment, referring to fig. 2 to 4, an angle between an axial direction of the fire hole 115 and a normal direction of a portion of the outer convex surface 114 corresponding to the fire hole 115 is 0 ° to 10 °. Specifically, the number of rows is counted from the inner peripheral edge 111 to the outer peripheral edge 112 of the outer convex surface 114, the angle a1 between the axial direction of the fire hole 115 of the second row of the outer convex surface 114 and the normal direction of the portion on the outer convex surface 114 where the fire hole 115 is located is 8 °, the angle a2 between the axial direction of the fire hole 115 of the fourth row of the outer convex surface 114 and the normal direction of the portion on the outer convex surface 114 where the fire hole 115 is located is 5 °, and the angle a3 between the axial direction of the fire hole 115 of the sixth row of the outer convex surface 114 and the normal direction of the portion on the outer convex surface 114 where the fire hole 115 is located is 8 °.

In one embodiment, the number of rows of fire holes 115 on the outer end surface 1142 is 2 to 4; the number of rows of fire holes 115 on the inner end surface 1141 is 2 to 4. In this way, the number of rows of fire holes 115 on the outer convex surface 114 is 5-8, so that the fuel gas is uniformly distributed to each fire hole 115 to form a wider high-temperature combustion area, the narrow high-temperature combustion area with only one row of fire holes 115 is improved, the high-temperature heat exchange area is increased, and the heat exchange efficiency is improved.

Further, 5 to 8 rows of fire holes 115 are spaced apart in the radial direction of the body 11 such that 5 to 8 rows of fire holes 115 are arranged at different heights of the outer convex surface 114. So, the gas that makes the fire hole 115 department of different high positions homoenergetic and air realization contact mix, and then form the ladder of difference in height and go out the fire effect on body 11, it is more abundant to realize the burning, and the combustion effect is better.

In order to make the combustion on the body 11 more uniform, a plurality of fire holes 115 are provided on the protruding height of the same outer boss, and the plurality of fire holes 115 are arranged at intervals along the circumferential direction of the body 11. Specifically, the fire holes 115 are uniformly distributed along the circumferential direction of the body 11, thereby ensuring uniform combustion at various positions on the body 11.

In one embodiment, referring to fig. 2 to 4, when the body 11 is placed normally horizontally, an included angle P1 between the axial direction of the fire holes 115 of the innermost row and the horizontal plane is not less than 50 °, and an included angle P2 between the axial direction of the fire holes 115 of the outermost row and the horizontal plane is not less than 62 °. Wherein, the fire holes 115 of the innermost row refer to the fire holes 115 of the row closest to the center of the body 11 on the outer convex surface 114, and the fire holes 115 of the outermost row refer to the fire holes 115 of the row farthest from the center of the body 11 on the outer convex surface 114.

In one embodiment, referring to fig. 2 to 4, when the body 11 is placed normally horizontally, a distance L1 between the edge of the fire hole 115 of the innermost row and the inner peripheral edge 111 of the body 11 in the horizontal direction is 0.4mm to 2mm, and a distance L2 between the edge of the fire hole 115 of the outermost row and the outer peripheral edge 112 of the body 11 in the horizontal direction is 0.4mm to 2mm. Specifically, a distance L1 between the edge of the fire hole 115 of the innermost row and the inner peripheral edge 111 of the body 11 in the horizontal direction is 0.4mm, 0.5mm, 0.6mm or 2mm, and a distance L2 between the edge of the fire hole 115 of the outermost row and the outer peripheral edge 112 of the body 11 in the horizontal direction is 0.4mm, 1mm, 1.5mm or 2mm.

In one embodiment, referring to fig. 1 to 6, a burner includes the outer ring fire cover 10 according to any of the above embodiments, and further includes a burner head 20 and an inner fire cover 30. The burner 20 is provided with an outer combustion chamber 21, and the outer combustion space 113 of the body 11 communicates with the outer combustion chamber 21. The furnace end 20 is further provided with an internal combustion air cavity 22, the internal combustion air cavity 22 and the external combustion air cavity 21 are mutually independent, and the external combustion air cavity 21 is wound around the periphery of the internal combustion air cavity 22. The intake side of the inner fire cover 30 communicates with the inner gas chamber 22. The burner 20 is also provided with two gas interfaces 23, one of the gas interfaces 23 is communicated with the internal combustion chamber 22, and the other gas interface 23 is communicated with the external combustion chamber. The gas port 23 is provided with a primary air factor adjuster 40. When the opening of the air inlet 44 is adjusted by the primary air-factor adjusting member 40, the amount of air entering the outer ring fire cover 10 or the inner ring fire cover can be correspondingly improved, i.e., the primary air-factor can be adjusted.

On the one hand, the above burner has more than 5 rows of fire holes 115 on the outer convex surface 114, and more fire holes 115 are arranged on the outer ring fire cover 10 with the same diameter, which is equivalent to increasing the heat exchange area, thus realizing a large-area high-temperature combustion area, improving the heat efficiency and enabling the gas combustion to be more complete. In addition, since the number of rows of fire holes 115 on the outer convex surface 114 is more than 5, the fuel gas is uniformly distributed to each fire hole 115 to form a wider high-temperature combustion area, thereby improving the narrow high-temperature combustion area with only one row of fire holes 115, increasing the high-temperature heat exchange area and improving the heat exchange efficiency. The fire holes 115 with more than 5 rows can uniformly distribute fire power so as to solve the problem that the fire power is concentrated on the main fire holes 115 and the bottom of the cooker is heated unevenly. On the other hand, in combination with more than 5 rows of fire holes 115, the diameter of the fire holes 115 is set to be 1.4 mm-1.7 mm, the distance between the edges of adjacent fire holes 115 is 1.2-2 times the diameter of the fire holes 115, and the fire holes are matched with atmospheric combustion with larger primary air coefficient (for example, the primary air coefficient is 0.6, 0.7 or 0.8), so that the head pressure of the outer ring fire cover 10 can be reduced, the tempering limit can be correspondingly increased, the wall thickness of the outer ring fire cover 10 can be further reduced, the materials are saved, and the device cost is reduced.

Further, the outer ring fire cover 10 is covered on the burner 20, the outer peripheral edge 112 of the body 11 contacts with the outer side wall of the outer combustion chamber 21, the outer peripheral edge 112 of the body 11 is provided with a step, and the step contacts with the outer side wall of the outer combustion chamber 21, so that the body 11 is stably arranged on the burner 20, and good sealing performance can be ensured. In addition, the inner peripheral edge 111 of the body 11 is connected with an annular supporting plate 12, specifically, the body 11 and the supporting plate 12 are in an integrated structure, and the supporting plate 12 contacts with the inner side wall of the outer gas cavity 21, so that the body 11 is stably arranged on the burner 20, and good tightness can be ensured.

Further, referring to fig. 7 to 9, the primary air factor adjusting member 40 corresponding to the inner fire cover 30 and the bottom plate 41 of the primary air factor adjusting member 40 corresponding to the outer fire cover shown in fig. 7 to 9 are connected to each other, and of course, a split design is also possible. The primary air-factor adjusting member 40 in the above embodiment includes a base plate 41 and an adjusting plate 42 rotatably stacked on the base plate 41. The middle part of the bottom plate 41 is provided with a gas hole 43, and the side part of the bottom plate 41 is provided with an air inlet 44. The middle part of the adjusting plate 42 is provided with a gas hole 43 communicated with the gas hole 43 of the bottom plate 41, and the side part of the bottom plate 41 is also provided with an air inlet 44. In the process of rotating the adjusting plate 42, the middle gas hole 43 of the adjusting plate 42 is always communicated with the gas hole 43 of the bottom plate 41, and when the air inlet 44 of the adjusting plate 42 is completely correspondingly communicated with the air inlet 44 of the bottom plate 41, that is, the adjusting plate 42 is positioned in the area outside the air inlet 44 of the bottom plate 41, the opening degree of the air inlet is maximum, and the air coefficient is 0.9; when the area of the air inlet 44 of the adjusting plate 42 corresponding to the air inlet 44 of the bottom plate 41 is smallest, that is, when the adjusting plate 42 is completely moved to the area of the air inlet 44 of the bottom plate 41, the opening degree of the air inlet is smallest, and the air ratio is, for example, 0.4; part of the adjusting plate 42 is aligned and overlapped with the bottom plate 41, the other part of the adjusting plate 42 is blocked in the air inlet 44 of the bottom plate 41, the opening degree of the air inlet is the middle opening degree, the air coefficient is between 0.4 and 0.9, for example, the air coefficient can be adjusted to 0.6, 0.7 or 0.8 according to the requirement, the combustion effect is flame granular, no backfire phenomenon is generated, and the smoke content is low.

In one embodiment, the burner in the above embodiment adopts a large premixed combustion mode, the primary air coefficient is large, 5 rows to 8 rows of fire holes 115 are arranged on the outer convex surface 114 of the outer ring fire cover 10, the head pressure is small, and under the condition of a certain rated heat load, the area of the fire holes 115 directly influences the performance of the burner. In particular, in the present embodiment, a relation between the heat load of the burner and the value of the open area is given: heat load P (kW) =3.5 to 5 total open area S (mm) on the outer convex surface 114 ² )。

In one embodiment, referring to fig. 1 to 6, a method for operating a burner according to any of the above embodiments includes the steps of: the primary air-factor adjusting member 40 corresponding to the outer fire cover is adjusted so that the primary air factor is 0.6 to 0.8.

Specifically, the primary air coefficient adjuster 40 is adjusted so that the primary air coefficient is 0.7 or 0.8.

According to the working method of the burner, on one hand, more than 5 rows of fire holes 115 are formed in the outer convex surface 114, more fire holes 115 are arranged on the outer ring fire cover 10 with the same diameter, the heat exchange area is increased, a large-area high-temperature combustion area can be realized, the heat efficiency is improved, and the gas combustion is more complete. In addition, since the number of rows of fire holes 115 on the outer convex surface 114 is more than 5, the fuel gas is uniformly distributed to each fire hole 115 to form a wider high-temperature combustion area, thereby improving the narrow high-temperature combustion area with only one row of fire holes 115, increasing the high-temperature heat exchange area and improving the heat exchange efficiency. The fire holes 115 with more than 5 rows can uniformly distribute fire power so as to solve the problem that the fire power is concentrated on the main fire holes 115 and the bottom of the cooker is heated unevenly. On the other hand, in combination with more than 5 rows of fire holes 115, the diameter of the fire holes 115 is set to be 1.4 mm-1.7 mm, the distance between the edges of adjacent fire holes 115 is 1.2-2 times the diameter of the fire holes 115, and the fire holes are matched with atmospheric combustion with larger primary air coefficient (for example, the primary air coefficient is 0.6, 0.7 or 0.8), so that the head pressure of the outer ring fire cover 10 can be reduced, the tempering limit can be correspondingly increased, the wall thickness of the outer ring fire cover 10 can be further reduced, the materials are saved, and the device cost is reduced.

First, a plurality of outer ring fire covers 10 with different diameters and the same other parameters of fire holes 115 are selected for combustion test. The burn test data are as follows:

the diameter of the fire hole 115 is 1.0mm, when the combustion test is carried out, the flame length of the fire hole 115 is very insufficient, the combustion is very high, the smoke is very high, the generated co content is very high, and no tempering exists;

the diameter of the fire hole 115 is 1.2mm, when the combustion test is carried out, the flame of the fire hole 115 is longer, the combustion is insufficient, the smoke is higher, the generated co content is higher, and no tempering exists;

the diameter of the fire hole 115 is 1.4mm, and when the combustion test is carried out, the combustion is sufficient, the smoke is low, the generated co content is low, and no tempering exists;

the diameter of the fire hole 115 is 1.5mm, and when the combustion test is carried out, the combustion is very sufficient, no smoke is generated, the generated co content is very low, and no tempering exists;

the diameter of the fire hole 115 is 1.6mm, and when the combustion test is carried out, the combustion is very sufficient, no smoke is generated, the generated co content is very low, and no tempering exists;

the diameter of the fire hole 115 is 1.7mm, and when the combustion test is carried out, the combustion is very sufficient, no smoke is generated, the generated co content is very low, and no tempering exists;

the diameter of the fire hole 115 is 2mm, and tempering is generated when a combustion test is performed;

the diameter of the fire hole 115 was 2.4mm, and the backfire phenomenon was remarkable when the combustion test was performed.

The combustion test shows that the diameter of the fire hole 115 is 1.4 mm-1.7 mm, especially when the diameter of the fire hole 115 is 1.5mm or 1.6mm, the fire can be ensured to be high, meanwhile, the bad phenomenon of tempering caused by overlarge diameter of the fire hole 115 can be avoided, and the bad phenomenon of overlarge smoke caused by overlarge diameter of the fire hole 115 can be avoided.

And secondly, selecting the aperture of the fire hole 115 to be 1.5-1.6 mm, and selecting a plurality of outer ring fire covers 10 with different edge intervals and the same other parameters of the fire hole 115 for performing the combustion test. Wherein, the combustion test data is as follows:

when the burning test is carried out, flames are connected easily to form a flame group, only one layer of flames are insufficient in burning, the content of harmful substances co in generated smoke is high, and the fire transmission speed between the fire holes 115 is high;

when the burning test is carried out, flames are easy to connect to form flame groups, only one layer of flames burn insufficiently, the content of harmful substances co in generated smoke is slightly higher, and fire transmission is fast between the fire holes 115;

the edge interval of the fire holes 115 is 1.2 times of the diameter of the fire holes 115, when a combustion test is carried out, the generated arc length is long, flames form flame particles, the flames of each row of fire holes 115 are clear, the combustion is complete, the content of harmful substances co in generated smoke is low, and the fire transmission among the fire holes 115 is quick;

the edge interval of the fire holes 115 is 1.4 times of the diameter of the fire holes 115, when a combustion test is carried out, the generated arc length is long, flames form flame particles, the flames of each row of fire holes 115 are clear, the combustion is very sufficient, the content of harmful substances co in generated smoke is very low, and the fire transmission among the fire holes 115 is fast;

the edge distance of the fire holes 115 is 1.6 times of the diameter of the fire holes 115, when a combustion test is carried out, the generated arc length is long, flames form flame particles, the flames of each row of fire holes 115 are clear, the combustion is very sufficient, the content of harmful substances co in generated smoke is very low, and the fire transmission among the fire holes 115 is fast;

the edge distance of the fire holes 115 is 2 times of the diameter of the fire holes 115, when a combustion test is carried out, the generated arc length is long, flames form flame particles, the flames of each row of fire holes 115 are clear, the combustion is very sufficient, the content of harmful substances co in generated smoke is very low, and the fire transmission speed between the fire holes 115 is slightly slow;

the interval between the edges of the fire holes 115 is 3 times the diameter of the fire holes 115, and when a combustion test is performed, the fire transfer between the fire holes 115 is difficult and the combustion effect is poor.

The combustion test concludes that when the diameter of the fire hole 115 combined with 1.5 mm-1.6 mm is 1.2 times-2 times of the diameter of the fire hole 115, especially 1.4 times-1.6 times of the diameter of the fire hole 115, the fire transmission effect is good, the combustion effect is in flame particles, on one hand, poor fire transmission effect caused by larger spacing between the edges of the fire hole 115 can be avoided, and on the other hand, higher smoke caused by smaller spacing between the edges of the fire hole 115 can be avoided.

And thirdly, adjusting the primary air coefficient adjusting members 40 corresponding to the outer ring fire cover 10 to different opening degrees, and performing the combustion test by adopting different primary air coefficients. The burn test data are as follows:

the primary air coefficient is adjusted to be 0.4 through the primary air coefficient adjusting part 40, and a combustion test is performed, so that yellow flame appears, the flame is very high, no flame particles exist, the combustion is insufficient, and the smoke is very large;

the primary air coefficient is adjusted to be 0.5 through the primary air coefficient adjusting piece 40, a combustion test is carried out, a small amount of yellow flame appears, the flame is higher, no flame particles exist, the combustion is insufficient, and the smoke is large;

the primary air coefficient is adjusted to be 0.6 through the primary air coefficient adjusting piece 40, a combustion test is carried out, flame is slightly higher, no flame particles exist, and slight smoke exists;

the primary air coefficient is adjusted to be 0.7 through the primary air coefficient adjusting part 40, so that a combustion test is performed, the flame is low, the firepower is larger, flame particles are arranged, and the combustion is more sufficient;

the primary air coefficient is adjusted to be 0.8 through the primary air coefficient adjusting part 40, so that a combustion test is performed, the flame is low, the firepower is high, flame particles are arranged, and the combustion is sufficient;

the combustion test shows that when the primary air coefficient is 0.4 to 0.6, no flame particles exist, the flame is high, smoke exists, and when the primary air coefficient is 0.7 to 0.8, the flame is low, the firepower is larger, the flame particles exist, and the combustion is more sufficient.

And in the combustion test four, selecting four outer ring fire covers 10 with different open areas and same other parameters on the outer convex surface 114 for the combustion test, wherein the number of rows of fire holes 115 on the outer convex surface 114 of the 4 outer ring fire covers 10 is 3, 4, 5 and 6 respectively. The burn test data are as follows:

for the outer ring fire cover 10 with only 3 rows of fire holes 115 on the outer convex surface 114, the flames of the 3 rows of fire holes 115 are separated from the flames during the combustion test, so that the combustion condition is poor;

for the outer ring fire cover 10 with only 4 rows of fire holes 115 on the outer convex surface 114, 2 rows of fire holes 115 are respectively arranged on the inner end surface 1141 and the outer end surface 1142, and when the combustion test is performed, part of the flames of the 4 rows of fire holes 115 are separated from the flames, so that the combustion condition is poor;

for the outer ring fire cover 10 with only 5 rows of fire holes 115 on the outer convex surface 114, 2 rows of fire holes 115 and 3 rows of fire holes 115 are respectively arranged on the inner end surface 1141 and the outer end surface 1142, and the flames of the 5 rows of fire holes 115 are basically not separated from the flames during a combustion test, so that the combustion condition is better;

for the outer ring fire cover 10 with only 6 rows of fire holes 115 on the outer convex surface 114, 3 rows of fire holes 115 are respectively arranged on the inner end surface 1141 and the outer end surface 1142, and the flames of the 6 rows of fire holes 115 are basically not separated from the flames during a combustion test, so that the combustion condition is good;

for the outer ring fire cover 10 with only 7 rows of fire holes 115 on the outer convex surface 114, 3 rows of fire holes 115 and 4 rows of fire holes 115 are respectively arranged on the inner end surface 1141 and the outer end surface 1142, and the flames of the 7 rows of fire holes 115 are basically not separated from the flames during a combustion test, so that the combustion condition is better;

for the outer ring fire cover 10 with only 8 rows of fire holes 115 on the outer convex surface 114, 4 rows of fire holes 115 are respectively arranged on the inner end surface 1141 and the outer end surface 1142, and the flames of the 8 rows of fire holes 115 are basically not separated from the flames during the combustion test, so that the combustion condition is better.

The combustion test shows that when the number of rows of fire holes 115 on the outer convex surface 114 is less than 4 rows, the combustion condition is poor; when the number of rows of fire holes 115 on outer convex surface 114 is 5 or more, the flame is not substantially lifted off, and the combustion condition is good.

Combustion test five, selecting a plurality of outer ring fire covers 10 with different curvatures and same other parameters of the outer convex surface 114 for combustion test:

the radius of curvature of the inner end surface 1141 is 20mm, the radius of curvature of the outer end surface 1142 is 25mm, the curvature of the outer convex surface 114 is very small, and when the combustion test is carried out, flames generated by the fire holes 115 are easy to be connected to form a flame group, only one layer of flames is insufficient in combustion, and the content of harmful substances co in generated smoke is high;

the radius of curvature of the inner end surface 1141 is 15mm, the radius of curvature of the outer end surface 1142 is 20mm, the curvature of the outer convex surface 114 is smaller, and when the combustion test is carried out, flames generated by the fire holes 115 are easy to be connected to form a flame group, only one layer of flames is insufficient in combustion, and the content of harmful substances co in generated smoke is relatively high;

the radius of curvature of the inner end surface 1141 is 10mm, the radius of curvature of the outer end surface 1142 is 15mm, the curvature of the outer convex surface 114 is smaller, the arc length generated during combustion test is long, flame particles are formed by flame, the flame of each row of flame holes 115 is distinct, the combustion is complete, and the content of harmful substances co in generated smoke is low;

the radius of curvature of the inner end surface 1141 is 9mm, the radius of curvature of the outer end surface 1142 is 12mm, the curvature of the outer convex surface 114 is small, the arc length generated during combustion test is long, flames form flame particles, the flames of each row of fire holes 115 are distinct, the combustion is complete, and the content of harmful substances co in generated smoke is low;

the radius of curvature of the inner end surface 1141 is 8mm, the radius of curvature of the outer end surface 1142 is 11mm, the curvature of the outer convex surface 114 is small, the arc length generated during combustion test is long, flames form flame particles, the flames of each row of fire holes 115 are distinct, the combustion is complete, and the content of harmful substances co in generated smoke is low;

the radius of curvature of the inner end surface 1141 is 7mm, the radius of curvature of the outer end surface 1142 is 10mm, the curvature of the outer convex surface 114 is small, the arc length generated during combustion test is long, flames form flame particles, the flames of each row of fire holes 115 are distinct, combustion is complete, and the content of harmful substances co in generated smoke is low.

The combustion test data show that when the curvature of the outer convex surface 114 is larger, the generated arc length is longer, the interval between the fire holes 115 can be larger, flame particles are easier to form by flame, the flame of each row of fire holes 115 is clear, the combustion is more sufficient, and the content of harmful substances co in generated smoke is lower; when the curvature is small, flames generated by the fire holes 115 are easy to be connected to form a flame group, only one layer of flames is insufficient in combustion, and the content of harmful substances co in generated smoke is relatively high.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims

1. An outer ring fire cover (10), characterized by comprising:

the fire-fighting device comprises a body (11), wherein the body (11) is in an annular arrangement, an outer protruding part is arranged between an inner peripheral edge (111) and an outer peripheral edge (112) of the body (11), the outer protruding part protrudes from an air inlet side of the body (11) to an air outlet side so as to form an outer combustion space (113) on the air inlet side of the body (11), more than 5 circumferential rows of fire holes (115) are arranged on an outer convex surface (114) of the outer protruding part at intervals, the diameter of each fire hole (115) is 1.4-1.7 mm, and the distance between the edges of adjacent fire holes (115) is 1.2-2 times the diameter of each fire hole (115);

the outer convex portion comprises an inner end face (1141) facing the center of the body (11) and an outer end face (1142) facing away from the center of the body (11), the outer end face (1142) is arranged on the periphery of the inner end face (1141), more than two circumferential rows of fire holes (115) are formed in the inner end face (1141) and the outer end face (1142), the total area of all the fire holes (115) in the outer end face (1142) is 1.5-3 times the total area of all the fire holes (115) in the inner end face (1141), and the curvature radius of the inner end face (1141) is 0.3-0.8 times the curvature radius of the outer end face (1142).

2. The outer ring fire cover (10) according to claim 1, wherein the depth of the fire holes (115) is 2.5 mm-3 mm.

3. The outer ring fire cover (10) according to claim 1, wherein the diameter of the fire hole (115) is 1.5mm to 1.6mm, and the distance between the edges of adjacent fire holes (115) is 1.4 times to 1.6 times the diameter of the fire hole (115).

4. The outer ring fire cover (10) according to claim 1, wherein when the body (11) is placed normally horizontally, a distance L1 between an edge of the fire hole (115) of the innermost row and an inner peripheral edge (111) of the body (11) in a horizontal direction is 0.4mm to 2mm, and a distance L2 between an edge of the fire hole (115) of the outermost row and an outer peripheral edge (112) of the body (11) in a horizontal direction is 0.4mm to 2mm.

5. The outer ring fire cover (10) according to claim 1, wherein the fire holes (115) of adjacent rows are equally spaced on the outer convex surface (114); the number of rows of fire holes (115) on the outer convex surface (114) is 5-8.

6. The outer ring fire cover (10) according to claim 1, wherein adjacent rows of the fire holes (115) are offset from each other; the number of fire holes (115) in each row is the same.

7. The outer ring fire cover (10) according to claim 6, wherein the connecting lines of centers of any two adjacent three fire holes (115) on the outer convex surface (114) are in an equilateral triangle.

8. An outer ring fire cover (10) according to any one of claims 1 to 7, characterised in that the diameter of the peripheral edge (112) of the body (11) is 90mm to 120mm.

9. A burner comprising an outer annular fire cover (10) according to any one of claims 1 to 8, a burner head (20) and an inner fire cover (30); the furnace end (20) is provided with an external combustion chamber (21), and an external combustion space (113) of the body (11) is communicated with the external combustion chamber (21); the furnace end (20) is also provided with an internal gas cavity (22), the internal gas cavity (22) and the external gas cavity (21) are mutually independent, and the external gas cavity (21) is wound on the periphery of the internal gas cavity (22); the air inlet side of the inner fire cover (30) is communicated with the inner combustion chamber (22); the furnace end (20) is also provided with two gas interfaces (23), one gas interface (23) is communicated with the internal gas cavity (22), and the other gas interface (23) is communicated with the external gas cavity (21); the gas interface (23) is provided with a primary air factor adjusting member (40).

10. A method of operating a burner as claimed in claim 9, comprising the steps of: the primary air coefficient adjusting piece (40) corresponding to the outer fire cover is adjusted to enable the primary air coefficient to be 0.6-0.8.