CN211011363U

CN211011363U - Outer ring fire lid and combustor

Info

Publication number: CN211011363U
Application number: CN201921552417.3U
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: 2020-07-14
Anticipated expiration: 2029-09-18

Abstract

The utility model relates to an outer loop fire lid and combustor, outer loop fire lid include the body. On the one hand, be provided with fire hole more than 5 rows on the outer convex surface, cover at the outer ring fire of equal diameter size, arrange more fire holes, increased heat transfer area in other words, can realize the high temperature combustion region of large tracts of land, improved the thermal efficiency, the gas combustion is more abundant. In addition, because the row number of the fire holes on the outer convex surface is more than 5 rows, the 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 edge spacing of the adjacent fire holes is 1.2-2 times of the diameter of the fire hole, the pressure of the head part of the outer ring fire cover can be reduced in cooperation with atmospheric combustion, the tempering limit can be correspondingly increased, the wall thickness of the outer ring fire cover can be further reduced, materials are saved, and the device cost is reduced.

Description

Outer ring fire lid and combustor

Technical Field

The utility model relates to a cooking utensils technical field especially relates to an outer loop fire lid and combustor.

Background

Conventional burners include an outer ring fire cap. Two circumferential rows of holes are generally arranged on the outer surface side surface of the outer ring fire cover, wherein one row of holes are main fire holes (main fire holes), and the other row of holes are flame stabilizing holes (or flame stabilizing grooves). The cooking is usually done by strong fire power, which makes the power of the cooker larger. In order to increase the combustion power, the area of the fire hole generally needs to be increased, and the fire hole is mainly increased in size, namely, the fire hole with the diameter of more than 2.4mm is opened in the market at present. Wherein, in order to avoid tempering, the depth of the fire hole needs to be increased, thus causing the thickness of the fire cover to be larger and greatly increasing the material cost. In addition, the firepower of the main fire hole is increased, so that the firepower of the bottom of the cooker close to the main fire holes of the inner ring and the outer ring is stronger, the bottom of the cooker is heated unevenly, and the cooking effect of food is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an outer loop fire lid, it can improve the tempering limit effectively, and the reduction device cost, the combustion effect is comparatively even simultaneously, guarantees better combustion effect.

The utility model aims to provide a second technical problem provides a combustor, and it can improve the tempering limit effectively, and the reducing device cost, the combustion effect is comparatively even simultaneously, guarantees better combustion effect.

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

an outer ring fire cover comprising: the body, the body is the annular setting, be equipped with outer bellying between the interior all around edge of body and the neighboring, outer bellying certainly the side of admitting air of body is to going out the fire side protrusion, with the side of admitting air 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 at interval, the diameter in fire hole is 1.4mm ~ 1.7mm, and is adjacent distance between the edge in fire hole is 1.2 ~ 2 times of the diameter in fire hole.

Outer loop fire lid, compare produced beneficial effect with the background art:

on the one hand, be provided with fire hole more than 5 rows on the outer convex surface, cover at the outer ring fire of equal diameter size, arrange more fire holes, increased heat transfer area in other words, so can realize the high temperature combustion region of large tracts of land, improve the thermal efficiency, the gas combustion is more abundant. In addition, because the row number of the fire holes on the outer convex surface is more than 5 rows, the 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. Firepower can evenly be distributed to the fire hole more than 5 rows to solve the firepower and concentrate on main fire hole, the inhomogeneous problem of pan bottom is heated. On the other hand, the fire holes are combined with more than 5 rows of fire holes, the diameter of each fire hole 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 each fire hole, and the fire holes are matched with atmospheric combustion with a large primary air coefficient (such as 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, materials are saved, and the device cost is reduced.

In one embodiment, the depth of the fire hole is 2.5 mm-3 mm. Therefore, the tempering limit of the outer ring fire cover of the embodiment is large, tempering can be avoided when the wall thickness of the outer ring fire cover is 2.5 mm-3 mm, the wall thickness of the outer ring fire cover is thin, materials can be saved, and the device cost is reduced.

In one embodiment, the diameter of the fire hole is 1.5 mm-1.6 mm, and the distance between the edges of the adjacent fire holes is 1.4 times-1.6 times the diameter of the fire hole. So, when guaranteeing great firepower, can avoid on the one hand because the diameter of fire hole too big leads to the bad phenomenon that appears the tempering, on the other hand can avoid leading to the bad phenomenon that the flue gas is too high because the diameter undersize of fire hole leads to appearing. In addition, combine in 1.5mm ~ 1.6 mm's fire hole aperture, the setting of fire hole edge interval is more suitable, and it is better to pass the fire effect, and the combustion effect presents flame graininess, and can avoid on the one hand because the great effect of passing the fire that leads to of fire hole edge interval is relatively poor, and on the other hand can avoid because the less flue gas that leads to of fire hole edge interval is higher.

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

In one embodiment, the fire holes of adjacent rows are arranged on the outer convex surface at equal intervals; the number of rows of fire holes on the outer convex surface is 5-8. So, because the row number of the fire hole on the outer convex surface is 5 and arranges ~ 8 rows, distribute the gas to each fire hole uniformly, form the high temperature combustion region of a broad, improved the narrow high temperature combustion district that only has a fire hole, increased high temperature heat transfer area, improve heat exchange efficiency. 5 rows to 8 rows of fire holes can uniformly distribute fire power, and the bottom of the cooker can be uniformly heated.

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

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

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

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

a burner comprises the outer ring fire cover, a burner head and an inner fire cover; the furnace end is provided with an external combustion air cavity, and an external combustion space of the body is communicated with the external combustion air cavity; 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 air cavity; the furnace head is also provided with two gas interfaces, wherein one gas interface is communicated with the internal gas cavity, and the other gas interface is communicated with the external gas cavity; the gas interface is provided with a primary air coefficient adjusting piece.

The combustor, compare produced beneficial effect with the background art:

In one embodiment, the outer ring fire cover is arranged on the furnace head, the peripheral edge of the body is in contact with the outer side wall of the outer gas cavity, the peripheral edge of the body is provided with a step, and the step is in contact with the outer side wall of the outer gas cavity.

Drawings

Fig. 1 is a top view structural diagram of an outer ring fire cover according to an embodiment of the present invention;

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

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

fig. 4 is a top view structural diagram 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 illustrating a state where the primary air-factor adjusting member is adjusted to the maximum opening degree according to an embodiment of the present invention;

fig. 8 is a schematic view illustrating a state where the primary air-factor regulator according to an embodiment of the present invention is adjusted to a medium opening degree;

fig. 9 is a schematic view of a state in which the primary air coefficient 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 face; 115. fire holes; 116. a step position; 12. a support plate; 20. a furnace end; 21. an external gas chamber; 22. an internal combustion air cavity; 23. a gas interface; 30. an inner fire cover; 40. a primary air factor adjuster; 41. a base plate; 42. an adjusting plate; 43. a gas hole; 44. an air inlet.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying 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, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

In the description of the present invention, it is to be understood that 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 implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the description of the present invention, it is to 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 fire lid 10 includes a body 11. The body 11 is arranged in a ring shape, and an outer convex part is arranged between the inner peripheral edge 111 and the outer peripheral edge 112 of the body 11. The outer convex part protrudes from the air inlet side of the body 11 to the fire outlet side to form an outer combustion space 113 on the air inlet side of the body 11, and 5 circumferential rows or more of fire holes 115 are arranged on the outer convex surface 114 of the outer convex part at intervals. The diameter of the fire holes 115 is 1.4 mm-1.7 mm, and the distance between the edges of the adjacent fire holes 115 is 1.2 times-2 times of the diameter of the fire holes 115.

It can be understood that the body 11 has an inlet side and an outlet side which are opposite to each other in the axial direction, and the fire holes 115 penetrate through the inlet side and the outlet side of the body 11, so that the gas on the inlet side of the body 11 can be ejected to the outlet side through the fire holes 115 for combustion. The outer ring fire cover 10 is generally horizontally disposed with its air inlet side facing downward and its fire outlet side facing upward, and the body 11 has an outer convex portion projecting upward, so that an outer combustion space 113 recessed upward is formed at the lower side of the body 11, and fire holes 115 are provided on the outer convex portion, so that the outer combustion space 113 and the fire outlet side communicate through the fire holes 115.

Above-mentioned outer ring fire lid 10, on the one hand, is provided with fire hole 115 more than 5 rows on the outer convex surface 114, on the outer ring fire lid 10 of equal diameter size, arranges more fire holes 115, has increased heat transfer area in other words, so can realize the high temperature combustion region of large tracts of land, has improved the thermal efficiency, and the gas combustion is more abundant. In addition, because the row number of the fire holes 115 on the outer convex surface 114 is more than 5 rows, 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. Firepower can evenly be distributed to fire hole 115 more than 5 rows to solve the firepower and concentrate on main fire hole 115, the inhomogeneous problem of pan bottom is heated. On the other hand, the fire holes 115 are combined with more than 5 rows of fire holes 115, the diameter of each fire hole 115 is set to be 1.4 mm-1.7 mm, the distance between the edges of adjacent fire holes 115 is 1.2 times-2 times of the diameter of each fire hole 115, and the fire holes are matched with atmospheric combustion with a large 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 material is 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 112 of the inner end surface 1141 is connected to the inner peripheral edge 111 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 main body 11 is 90mm to 120 mm.

In one embodiment, the depth of the fire hole 115 is 2.5mm to 3 mm. Therefore, because the tempering limit of the outer ring fire cover 10 of the embodiment is larger, the 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 thinner, the material can be saved, and the device cost can be reduced.

In one embodiment, the diameter of the fire holes 115 is 1.5mm to 1.6mm, and the distance between the edges of the adjacent fire holes 115 is 1.4 times to 1.6 times the diameter of the fire holes 115. Thus, when ensuring larger firepower, on the one hand, the bad phenomenon of tempering caused by the oversize diameter of the fire hole 115 can be avoided, and on the other hand, the bad phenomenon of overhigh smoke caused by the undersize diameter of the fire hole 115 can be avoided. In addition, combine in the fire hole 115 aperture of 1.5mm ~ 1.6mm, the setting of fire hole 115 edge interval is more suitable, and it is better to pass the fire effect, and the combustion effect presents flame graininess, and can avoid on the one hand because the great effect of passing the fire that leads to of fire hole 115 edge interval is relatively poor, and on the other hand can avoid leading to the flue gas higher because the fire hole 115 edge interval is less.

In one embodiment, the fire holes 115 of adjacent rows are arranged on the outer convex surface 114 at equal intervals; the number of rows of fire holes 115 on the outer convex surface 114 is 5 to 8. Therefore, the rows of the fire holes 115 on the outer convex surface 114 are 5 rows to 8 rows, and the fuel gas is uniformly distributed to each fire hole 115 to form a wider high-temperature combustion area, so that 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. 5 rows to 8 rows of fire holes 115 can uniformly distribute firepower, and the bottom of the cooker can be uniformly heated.

In one embodiment, the fire holes 115 of adjacent rows are offset from each other; the number of fire holes 115 in each row is the same. So, fire hole 115 evenly arranges on outer convex surface 114, realizes evenly distributed firepower, realizes that the burning is more abundant, and the combustion effect is better, also can realize that the pan bottom is heated evenly.

In one embodiment, the centers of any two adjacent three fire holes 115 on the outer convex surface 114 are connected in an equilateral triangle. So, fire hole 115 evenly arranges on outer convex surface 114, realizes evenly distributed firepower, realizes that the burning is more abundant, and the combustion effect is better, also can realize that the pan bottom is heated evenly.

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 periphery of the inner end surface 1141, two or more circumferential rows of fire holes 115 are disposed on both the inner end surface 1141 and the outer end surface 1142, 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 curvature radius of the inner end surface 1141 is 0.3-0.8 times the curvature radius of the outer end surface 1142. Therefore, the total area of all the fire holes 115 on the outer end surface 1142 is 1.5 to 3 times of the total area of all the fire holes 115 on the inner end surface 1141, the curvature radius of the inner end surface 1141 is 0.3 to 0.8 times of the curvature radius of the outer end surface 1142, the fire holes 115 on the outer end surface 1142 are arranged outwards, the fire holes 115 on 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.

In one embodiment, referring to fig. 1 to 6, the radius of curvature of the inner end surface 1141 is 7mm to 9 mm; the radius of curvature of the outer end surface 1142 is 10mm to 12 mm. Thus, for the outer ring fire cover 10 with the same inner diameter and outer diameter, when the curvature of the outer convex surface 114 is larger, the generated arc length is longer, the distance between the fire holes 115 can be made larger, the flame is easier to form flame particles, the flame of each row of fire holes 115 is distinct, the combustion is more sufficient, and the content of harmful substance co in the 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 flame is generated, the combustion is insufficient, and the content of harmful substance co in the 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, an angle a1 between the axial direction of the fire holes 115 in 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 holes 115 are located is 8 °, an angle a2 between the axial direction of the fire holes 115 in 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 holes 115 are located is 5 °, and an angle a3 between the axial direction of the fire holes 115 in 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 holes 115 are 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. Therefore, the rows of the fire holes 115 on the outer convex surface 114 are 5 rows to 8 rows, 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, the rows 5 to 8 of the fire holes 115 are distributed at intervals along the radial direction of the body 11, so that the rows 5 to 8 of the fire holes 115 are arranged at different heights on the outer convex surface 114. So for the gas homoenergetic of the fire hole 115 department of co-altitude position not realizes the contact with the air and mixes, and then forms the ladder of highly difference on body 11 and goes out the fire effect, realizes that the burning is more abundant, 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 at the same protruding height of the outer protrusion, 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 each position on the body 11.

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

In one embodiment, referring to fig. 2 to 4, when the body 11 is normally horizontally placed, the distance L1 between the edge of the fire holes 115 of the innermost row and the inner peripheral edge 111 of the body 11 in the horizontal direction is 0.4mm to 2mm, the distance L2 between the edge of the fire holes 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, the distance L1 between the edge of the fire holes 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 the distance L2 between the edge of the fire holes 115115 of the innermost row and the outer peripheral edge 112112 of the body 1111 in the horizontal direction is 0.4mm, 1mm, 1.5mm or 2 mm.

In one embodiment, referring to fig. 1 to 6, a burner includes the outer fire cover 10 according to any one of the above embodiments, and further includes a burner 20 and an inner fire cover 30. The burner 20 is provided with an external gas chamber 21, and the external gas space 113 of the body 11 is communicated with the external gas chamber 21. The burner 20 is further provided with an inner gas cavity 22, the inner gas cavity 22 and the outer gas cavity 21 are arranged independently, and the outer gas cavity 21 is arranged around the outer periphery of the inner gas cavity 22. The intake side of the inner fire cover 30 communicates with the inner combustion air chamber 22. The burner 20 is further provided with two gas connectors 23, wherein one gas connector 23 is communicated with the internal gas cavity 22, and the other gas connector 23 is communicated with the external gas cavity. The gas interface 23 is provided with a primary air factor regulator 40. When the primary air coefficient adjusting part 40 adjusts the opening of the air inlet 44, the amount of air entering the outer ring fire cover 10 or the inner ring fire cover can be improved accordingly, i.e. the primary air coefficient can be adjusted.

According to the combustor, on one hand, the outer convex surface 114 is provided with more than 5 rows of fire holes 115, and more fire holes 115 are arranged on the outer ring fire cover 10 with the same diameter, so that 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 sufficient. In addition, because the row number of the fire holes 115 on the outer convex surface 114 is more than 5 rows, 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. Firepower can evenly be distributed to fire hole 115 more than 5 rows to solve the firepower and concentrate on main fire hole 115, the inhomogeneous problem of pan bottom is heated. On the other hand, the fire holes 115 are combined with more than 5 rows of fire holes 115, the diameter of each fire hole 115 is set to be 1.4 mm-1.7 mm, the distance between the edges of adjacent fire holes 115 is 1.2 times-2 times of the diameter of each fire hole 115, and the fire holes are matched with atmospheric combustion with a large 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 material is saved, and the device cost is reduced.

Further, outer ring fire lid 10 is covered on furnace end 20, and the peripheral edge 112 of body 11 contacts with the lateral wall of outer gas chamber 21, and the peripheral edge 112 of body 11 is equipped with the step position, and the step position contacts with the lateral wall of outer gas chamber 21, is favorable to body 11 to set up firmly on furnace end 20, can guarantee better leakproofness. In addition, the inner peripheral edge 111 of the body 11 is connected with the annular support plate 12, specifically, the body 11 and the support plate 12 are integrated, and the support plate 12 is in contact with the inner side wall of the outer gas chamber 21, which is beneficial to stably arrange the body 11 on the burner 20 and ensure better sealing performance.

Further, referring to fig. 7-9, 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 are shown in fig. 7-9, but they may be of a split design. The primary air factor adjusting member 40 in the above embodiment includes a bottom plate 41 and an adjusting plate 42 rotatably stacked on the bottom plate 41. The middle of the bottom plate 41 is provided with a gas hole 43, and the side 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 base plate 41, and the side part of the base plate 41 is also provided with an air inlet 44. In the process of rotating the adjusting plate 42, the gas holes 43 in the middle of the adjusting plate 42 are always communicated with the gas holes 43 of the bottom plate 41, and when the air inlets 44 of the adjusting plate 42 are completely and correspondingly communicated with the air inlets 44 of the bottom plate 41, that is, the adjusting plate 42 is located in the area outside the air inlets 44 of the bottom plate 41, the opening degree of air inlet is the largest, and the air coefficient is, for example, 0.9; when the area of the corresponding coincidence of the air inlet 44 of the adjusting plate 42 and the air inlet 44 of the base plate 41 is the smallest, that is, the adjusting plate 42 is completely moved to the area of the air inlet 44 of the base plate 41, the opening degree of the air inlet is the smallest, and the air factor is, for example, 0.4; one part of the adjusting plate 42 is aligned and overlapped with the bottom plate 41, the other part of the adjusting plate 42 is shielded by the air inlet 44 of the bottom plate 41, the opening degree of the air inlet is a medium opening degree, the air coefficient is between 0.4 and 0.9, for example, the air coefficient can be adjusted to be 0.6, 0.7 or 0.8 according to requirements, the combustion effect can be realized to be flame granular, the tempering phenomenon is avoided, and the smoke content is low.

In one embodiment, the burner in the above embodiments adopts a large premix 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 the area of the fire holes 115 directly influences the performance of the burner under a certain rated thermal load. In the present embodiment in particular, the relationship between the thermal load of the burner and the numerical value of the open area is given by: a total open area S (mm) of the outer surface 114 under a heat load P (kW) of 3.5 to 5%²)。

In one embodiment, referring to fig. 1 to 6, a method for operating a burner according to any one of the above embodiments includes the following steps: and adjusting the primary air coefficient adjusting piece 40 corresponding to the outer fire cover to enable the primary air coefficient to be 0.6-0.8.

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

According to the working method of the burner, on one hand, the outer convex surface 114 is provided with more than 5 rows of fire holes 115, and more fire holes 115 are arranged on the outer ring fire cover 10 with the same diameter, which is equivalent to increase 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, because the row number of the fire holes 115 on the outer convex surface 114 is more than 5 rows, 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. Firepower can evenly be distributed to fire hole 115 more than 5 rows to solve the firepower and concentrate on main fire hole 115, the inhomogeneous problem of pan bottom is heated. On the other hand, the fire holes 115 are combined with more than 5 rows of fire holes 115, the diameter of each fire hole 115 is set to be 1.4 mm-1.7 mm, the distance between the edges of adjacent fire holes 115 is 1.2 times-2 times of the diameter of each fire hole 115, and the fire holes are matched with atmospheric combustion with a large 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 material is saved, and the device cost is reduced.

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

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

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

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

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

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

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

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

the diameter of the fire hole 115 is 2.4mm, and the tempering phenomenon is obvious when a combustion test is carried out.

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

And in the second combustion test, the aperture of the fire hole 115 is selected to be 1.5 mm-1.6 mm, and a plurality of outer ring fire covers 10 with different edge distances of the fire holes 115 and the same other parameters are selected for carrying out the combustion test. Wherein, the burning test data is as follows:

the edge distance of the fire holes 115 is 0.8 times of the diameter of the fire holes 115, when a combustion test is carried out, flames are connected easily to form a flame group, only one layer of flame is formed, the combustion is insufficient, the content of harmful substances co in the generated smoke is high, and the fire transfer between the fire holes 115 is fast;

the edge distance of the fire holes 115 is 1 time of the diameter of the fire holes 115, when a combustion test is carried out, flames are connected easily to form a flame group, only one layer of flames is provided, the combustion is not sufficient, the content of co of harmful substances in the generated smoke is slightly higher, and the fire transfer between the fire holes 115 is fast;

the edge distance 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, flame forms flame particles, the flame of each row of fire holes 115 is clear, the combustion is sufficient, the content of harmful substance co in the generated smoke is low, and the fire transfer between the fire holes 115 is rapid;

the edge distance 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, flame forms flame particles, the flame of each row of fire holes 115 is distinct, the combustion is sufficient, the content of harmful substance co in the generated smoke is low, and the fire transfer between the fire holes 115 is rapid;

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, flame forms flame particles, the flame of each row of fire holes 115 is distinct, the combustion is sufficient, the content of harmful substance co in the generated smoke is low, and the fire transfer between the fire holes 115 is rapid;

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, flame forms flame particles, the flame of each row of fire holes 115 is distinct, the combustion is sufficient, the content of harmful substance co in the generated smoke is low, and the fire transfer speed between the fire holes 115 is slow;

the edge distance of the fire holes 115 is 3 times of the diameter of the fire holes 115, and when a combustion test is carried out, fire transfer between the fire holes 115 is difficult, and the combustion effect is poor.

The conclusion of the combustion test is that, in combination with the aperture of the fire holes 115 with the diameter of 1.5 mm-1.6 mm, the distance between the edges of the adjacent fire holes 115 is 1.2 times-2 times of the diameter of the fire holes 115, especially 1.4 times-1.6 times of the diameter of the fire holes 115, the fire transfer effect is better, the combustion effect is in the shape of flame particles, on one hand, the poor fire transfer effect caused by the larger distance between the edges of the fire holes 115 can be avoided, and on the other hand, the higher smoke caused by the smaller distance between the edges of the fire holes 115 can be avoided.

And thirdly, adjusting the primary air coefficient adjusting piece 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 combustion test data is as follows:

the primary air coefficient is adjusted to be 0.4 by the primary air coefficient adjusting part 40, and a combustion test is carried out, 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 by the primary air coefficient adjusting part 40, and a combustion test is carried out, so that a small amount of yellow flame appears, the flame is high, no flame particles exist, the combustion is insufficient, and the smoke is large;

adjusting the primary air coefficient to be 0.6 by the primary air coefficient adjusting part 40, and carrying out a combustion test, wherein the flame is slightly higher, no flame particles exist, and slight smoke exists;

the primary air coefficient is adjusted to be 0.7 by the primary air coefficient adjusting part 40, and a combustion test is carried out, wherein the flame is short, the firepower is high, flame particles exist, and the combustion is sufficient;

the primary air coefficient is adjusted to be 0.8 by the primary air coefficient adjusting part 40, and a combustion test is carried out, so that the flame is short, the firepower is high, flame particles exist, and the combustion is sufficient;

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

And fourthly, selecting four outer ring fire covers 10 with different opening areas on the outer convex surfaces 114 and the same other parameters to perform the combustion test, wherein the rows of fire holes 115 on the outer convex surfaces 114 of the 4 outer ring fire covers 10 are respectively 3 rows, 4 rows, 5 rows and 6 rows. The combustion test data is as follows:

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

for the outer ring fire cover 10 with 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 during a combustion test, part of flames of the 4 rows of fire holes 115 leaves 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 during a combustion test, flames of the 5 rows of fire holes 115 basically do not leave the flames, 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 during a combustion test, flames of the 6 rows of fire holes 115 basically do not leave the flames, so that the combustion condition is better;

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 during a combustion test, flames of the 7 rows of fire holes 115 basically do not leave the flames, 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 during a combustion test, flames of the 8 rows of fire holes 115 basically do not leave the flames, so that the combustion condition is better.

The conclusion of the combustion test is that when the number of rows of the fire holes 115 on the outer convex surface 114 is less than 4, the combustion condition is poor; when the number of rows of the fire holes 115 on the outer convex surface 114 is more than 5, the flame is not substantially separated from the flame, and the combustion condition is better.

And (5) selecting a plurality of outer ring fire covers 10 with different curvatures of the outer convex surfaces 114 and the same other parameters for carrying out the combustion test:

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

the curvature radius of the inner end surface 1141 is 15mm, the curvature radius of the outer end surface 1142 is 20mm, the curvature of the outer convex surface 114 is smaller, during a combustion test, flames generated by the fire holes 115 are easily connected to form a flame group, only one layer of flames is formed, the combustion is insufficient, and the content of harmful substance co in the generated smoke is relatively higher;

the curvature radius of the inner end surface 1141 is 10mm, the curvature radius of the outer end surface 1142 is 15mm, the curvature of the outer convex surface 114 is smaller, during a combustion test, the generated arc length is long, flame forms flame particles, the flame of each fire hole 115 is distinct, the combustion is sufficient, and the content of harmful substance co in the generated smoke is low;

the curvature radius of the inner end surface 1141 is 9mm, the curvature radius of the outer end surface 1142 is 12mm, the curvature of the outer convex surface 114 is small, during a combustion test, the generated arc length is long, flame forms flame particles, the flame of each fire hole 115 is distinct, the combustion is sufficient, and the content of harmful substance co in the 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, during a combustion test, the generated arc length is long, flame forms flame particles, the flame of each fire hole 115 is distinct, the combustion is sufficient, and the content of harmful substance co in the 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, during a combustion test, the generated arc length is long, flame forms flame particles, the flame of each fire hole 115 is distinct, the combustion is sufficient, and the content of harmful substance co in the generated smoke is low.

The conclusion of the combustion test data is that when the curvature of the outer convex surface 114 is larger, the generated arc length is longer, the distance between the fire holes 115 can be made larger, the flame is easier to form flame particles, the flame of each fire hole 115 is distinct, the combustion is more sufficient, and the content of harmful substance co in the 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 flame is generated, the combustion is insufficient, and the content of harmful substance co in the generated smoke is relatively high.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

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

the flame-retardant plastic pipe comprises a body (11), wherein the body (11) is arranged annularly, 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 a fire 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 edges of adjacent fire holes (115) is 1.2-2 times of the diameter of each fire hole (115).

2. The outer ring fire cap (10) of claim 1 wherein said fire holes (115) have a depth of 2.5mm to 3 mm.

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

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

5. The outer ring fire cover (10) of claim 1, wherein the fire holes (115) of adjacent rows are arranged on the outer convex surface (114) at equal intervals; the rows of fire holes (115) on the outer convex surface (114) are 5 to 8.

6. The outer ring fire cover (10) of claim 1 wherein said fire apertures (115) of adjacent rows are offset from one another; the number of the fire holes (115) in each row is the same.

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

8. Outer ring fire lid (10) according to any of claims 1 to 7, characterised in that the diameter of the peripheral edge (112) of the body (11) is between 90mm and 120 mm.

9. Burner, characterized in that it comprises an outer ring fire cover (10) according to any one of claims 1 to 8, and also comprises a burner (20) and an inner fire cover (30); the furnace end (20) is provided with an external gas cavity (21), and an external gas space (113) of the body (11) is communicated with the external gas cavity (21); the furnace end (20) is also 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 on the periphery of the internal combustion air cavity (22); the air inlet side of the inner fire cover (30) is communicated with the inner combustion air cavity (22); the furnace end (20) is also provided with two gas interfaces (23), one of the gas interfaces (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 coefficient adjusting piece (40).

10. Burner according to claim 9, wherein said outer annular flame cover (10) is placed over said burner (20), the peripheral edge (112) of said body (11) being in contact with the outer side wall of said outer chamber (21), said peripheral edge (112) of said body (11) being provided with a step in contact with the outer side wall of said outer chamber (21).