CN115342352A - Central fire cover and combustor comprising same - Google Patents

Abstract

The invention provides a central fire cover and a burner comprising the same, wherein the central fire cover is provided with a central channel, a fire hole, an air cavity, an air outlet channel, an air blowing channel and an annular groove for communicating the fire hole with the outside, the central fire cover comprises a lower cover body and an upper cover body covered above the lower cover body, the air cavity is formed between the upper cover body and the lower cover body, the central channel is arranged on the lower cover body and is communicated with the air cavity through the air outlet channel, and the air cavity is communicated with the annular groove through the air blowing channel. The invention can reduce the risk of flame separation and avoid the problem of fire hole blockage.

Description

Central fire cover and combustor comprising same

Technical Field

The invention relates to the technical field of household gas cookers, in particular to a central fire cover and a burner comprising the same.

Background

In the process of cooking food by using the gas cooker, the food is inevitably overflowed, oil-water mixture splashes and the like, and particularly, the food overflows a pot carelessly when porridge is made. The overflowing food residue can directly block the fire hole channel of the fire cover, thereby causing ignition failure; or can cover the inside gas cavity that the fire covered along the fire downwards of fire hole passageway, cause the residue in kind to pile up in the gas cavity for the combustor performance is not good or can't strike sparks, influences the use of gas cooking utensils.

When the existing fire cover fire hole is blocked by oil stain, food residue and the like, manual dredging is often needed, people use the fire cover for a long time and do not dredge, so that the stove cannot be ignited, and finally the fire cover is fed back to a manufacturer for replacement, thereby wasting time and energy.

Disclosure of Invention

The invention mainly aims to provide a central fire cover to solve the problem that fire holes are easily blocked when food overflows and an oil-water mixture splashes in the fire cover in the prior art.

In order to achieve the purpose, the invention provides a central fire cover which is provided with a central channel and a fire hole, and also provided with an air cavity, an air outlet channel, an air blowing channel and an annular groove for communicating the fire hole with the outside; the central fire cover comprises a lower cover body and an upper cover body covered above the lower cover body, the air cavity is formed between the upper cover body and the lower cover body, the central channel is arranged on the lower cover body and communicated with the air cavity through the air outlet channel, and the air cavity is communicated with the annular groove through the air blowing channel.

When the central fire cover is normally combusted, due to the arrangement of the annular groove, a flame stabilizing ring can be formed at the bottom of the annular groove, so that the flame leaving risk can be reduced; when running into food and overflowing or oil water mixture when splashing, inside liquid can not directly flow into central fire lid yet, but flow into at annular groove internal rectangular bag formation liquid film, at this moment, the gas produces the extrusion in the annular groove top through the channel of blowing in the air cavity to break through liquid film, make the normal circulation of gas, and then avoided the problem that the fire hole is blockked up.

Illustratively, the annular groove has a width of 1mm to 3mm. So, not only avoided the secondary intake not enough and the unable effectual steady flame ring problem that forms of gas, avoided the gas to save time overlength and the too big problem of gas consumption moreover.

Illustratively, the air cavity has a depth t, and the depth t is 1mm to 4mm. Therefore, the problem that the combustion performance is influenced due to the fact that too large air cavities gather too much gas is avoided, and the problem that the liquid film cannot be broken due to too small extrusion force caused by too small air cavities is avoided.

Illustratively, the central fire cover is provided with a central axis, and an included angle of 0-45 degrees is formed between the air blowing channel and the central axis. The included angle between the air blowing channel and the central axis is 0 degree, 15 degrees, 30 degrees, 45 degrees and the like, for example, because the central axis is vertical when the central fire cover is used, the air in the air cavity is extruded above the annular groove through the air blowing channel, and the liquid film is easier to break through.

Illustratively, the fire hole, the air outlet channel and the air blowing channel are all arranged on the lower cover body, and the annular groove extends upwards from the lower end surface of the lower cover body to be communicated with the fire hole. Therefore, the fire hole, the air outlet channel, the air blowing channel and the annular groove are all arranged on the lower cover body, and the processing is convenient.

Illustratively, the annular groove divides the fire hole into a first hole section and a second hole section. So, when normal burning, partly gas can be followed central channel and directly go out the fire through the fire hole burning, and another portion gas gets into the air cavity through air outlet channel and then flows in to the ring channel through the channel of blowing to form steady flame ring in the ring channel bottom, like this, can not only guarantee combustion efficiency, can reduce moreover from the flame risk.

Exemplarily, the lower cover body comprises an inner side wall, a top wall and an outer side wall, the top wall and the inner side wall are enclosed to form the central channel, the inner side wall, the top wall and the outer side wall are enclosed to form the annular groove, the first hole section is located on the inner side wall, the second hole section is located on the outer side wall, and the air outlet channel and the air blowing channel are arranged on the top wall. So, the lower cover body is simple in structure and is beneficial to forming an air outlet channel and an air blowing channel.

Illustratively, the top wall has a central bore, an outer ring located outside the insufflation passage, and an inner ring located between the central bore and the outer ring; the upper cover body is provided with an insertion part, a top part and a side part, the insertion part is inserted into the central hole, the side part is overlapped on the outer ring, the top part is provided with a lower surface, the inner ring is provided with a top surface, and a gap is formed between the lower surface and the top surface to form the air cavity. Thus, not only the upper cover body can be stably covered on the lower cover body, but also the air cavity can be formed with a simple structure.

Illustratively, the air outlet channel comprises a plurality of air outlet holes, the centers of the air outlet holes are positioned on the same circumference D1, and the air outlet holes are uniformly distributed; the air blowing channel comprises a plurality of air inlet holes, the centers of the air inlet holes are located on the same circumference D2, D2 is larger than D1, and the air inlet holes are evenly distributed. Therefore, the phenomenon that excessive gas enters the gas cavity through the gas outlet channel to affect the combustion performance during normal combustion can be avoided.

Illustratively, the air outlet channel is a through hole located in the center of the lower cover body; the air blowing channel comprises a plurality of air inlet holes, the centers of the air inlet holes are located on the same circumference D2, the air inlet holes are uniformly distributed, or the air blowing channel is an annular through groove. Therefore, the phenomenon that excessive gas enters the blowing channel through the gas cavity to affect the combustion performance during normal combustion can be avoided.

Illustratively, the air outlet channel is an annular through groove; the air blowing channel is an annular through groove. Therefore, the purpose of communicating the central channel with the air cavity and the air cavity with the annular groove can be achieved, and the structure is simple and convenient to process.

The insert part and the central hole are connected in a sealing mode through threads and/or sealing rings. So, can make on the one hand the upper cover body set up under on the lid firmly, on the other hand can guarantee the gas tightness of air cavity, makes the gas in the air cavity can only follow air outlet channel, the business turn over of air blowing channel.

Illustratively, the annular groove divides the lower cover into an inner ring body and an outer ring body, and the fire hole is provided on the outer ring body. So, when normal burning, the gas gets into the air cavity through outlet channel then through the branch of gas blowing channel, partly through fire hole direct combustion, another part flows in to the ring channel to form steady flame ring in the ring channel bottom, in order to reach assurance combustion efficiency, reduce the purpose from the flame risk simultaneously.

Illustratively, the lower cover body has a lower side wall, the upper cover body has an upper side wall enclosed outside the lower side wall, the upper side wall has an inner side surface, the lower side wall has an outer side surface, and the air blowing passage and the annular groove are formed between the inner side surface and the outer side surface. In this way, the blow channel and the annular groove can be formed in a simple manner.

Illustratively, the fire holes are provided on the upper sidewall. So, the fire hole forms on last lid, and when normal burning, the gas gets into the air cavity through outlet channel and then flows in to the ring channel through gas blowing channel branch, partly through fire hole direct combustion, another part to form steady flame ring in the ring channel bottom, in order to reach and guarantee combustion efficiency, reduce the purpose from the flame risk simultaneously.

Illustratively, the fire hole includes a first hole section disposed on the lower sidewall and a second hole section disposed on the upper sidewall. So, all be formed with some fire holes on upper cover body and the lower cover body, when normal burning, partly gas can be followed central passage and directly go out the fire through the fire hole burning, and another portion gas gets into the air cavity through air outlet channel and then flows in to the ring channel through the gas blowing channel to form the steady flame ring bottom the ring channel, like this, can not only guarantee combustion efficiency, can reduce moreover from the flame risk.

According to another aspect of the invention, a burner is also provided, comprising any one of the central fire covers as described above. Since the above-mentioned center fire cover has the above-mentioned advantageous effects, the burner provided with the above-mentioned center fire cover also necessarily has the above-mentioned advantageous effects.

The advantages and features of the present invention are described in detail below with reference to the accompanying drawings.

Drawings

The following drawings of the present invention are included to provide a further understanding of the invention. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention. In the drawings, there is shown in the drawings,

FIG. 1 is an exploded schematic view of a center fire cover according to an exemplary embodiment of the present invention;

FIG. 2 is an internal structural view of the center fire cover of FIG. 1;

FIG. 3 is a front view (in exploded condition) of the center fire cover of FIG. 1;

FIG. 4 isbase:Sub>A sectional view taken along line A-A of FIG. 3;

FIG. 5 is a bottom view of the center fire cap of FIG. 1;

FIG. 6 is a block diagram of a lower cover body of a center fire cover in accordance with an exemplary embodiment of the present invention;

FIG. 7 is an internal structural view of a center fire cover according to another exemplary embodiment of the present invention;

FIG. 8 is an internal structural view of a center fire cover according to yet another exemplary embodiment of the present invention;

FIG. 9 is an exploded schematic view of a center fire cover according to an exemplary embodiment of the present invention;

fig. 10 is an internal structure view of the center fire cover of fig. 9.

Wherein the figures include the following reference numerals:

110-lower cover

101-central passage

102-fire hole

1021-first hole section

1022-second bore section

102' -lower circle fire hole

103-air outlet channel

1031-air outlet

104-air blowing channel

1041-inlet of air

1042-blowing outlet

1043-blowing inlet

105-ring groove

111-inner side wall

111' -lower side wall

1111' -external side

112-ceiling wall

1121 center hole

11201 middle top surface

11202-step surface

1122-outer ring

1123 inner ring

11231-Top surface

113-outer side wall

114-clamping groove

120-upper cover body

121-insert part

122-top

1221 lower surface

123-side part

123' -Upper side wall

1231' -inner side surface

1201-lower surface of cover

124-brim of hat

130-air cavity

t-clearance

a-width of the annular groove

p-thickness of the outer side wall

Detailed Description

In the following description, numerous details are provided to provide a thorough understanding of the present invention. One skilled in the art will recognize, however, that the following description is merely illustrative of a preferred embodiment of the invention, and that the invention can be practiced without one or more of these details. In other instances, well known features have not been described in detail so as not to obscure the invention.

For a household gas range, a burner of the household gas range generally has a large flame cover (also called an outer ring flame cover) and a small flame cover (also called a center flame cover) to form at least two rings of flames, thereby providing a plurality of flame modes when used by a user. Accordingly, the burner further comprises a large flame distributor and a small flame distributor, and a large flame venturi and a small flame venturi. The small fire distributor is arranged at the center of the large fire distributor. The big fire cover and the small fire cover are respectively covered on the big fire distributor and the small fire distributor, and the big fire cover is positioned at the periphery of the small fire cover. The big fire venturi and the small fire venturi are respectively connected to the big fire distributor and the small fire distributor. The big fire distributor, the big fire cover and the big fire venturi form a big fire gas mixing chamber. The small fire distributor, the small fire cover and the small fire venturi form a small fire gas mixing chamber.

First embodiment

A center fire cover according to an embodiment of the present invention will be described with reference to fig. 1 to 6.

The center fire cover includes a lower cover body 110 and an upper cover body 120 disposed over the lower cover body 110. The lower cover body 110 is provided with a central channel 101 and fire holes 102, the fire holes 102 are used for communicating the central channel 101 with the outside, the fire holes 102 can be multiple, in the embodiment shown in fig. 1, the fire holes 102 are divided into an upper circle and a lower circle, the aperture of the upper circle of fire holes is larger than that of the lower circle of fire holes, the upper circle of fire holes is a main fire hole, and the lower circle of fire holes is a flame stabilizing hole. An air cavity 130 is formed between the upper cover body 120 and the lower cover body 110, the lower cover body 110 is further provided with an air outlet passage 103, an air blowing passage 104 and an annular groove 105 for communicating the fire hole 102 with the outside, the annular groove 105 divides the fire hole 102 into a first hole section 1021 and a second hole section 1022, the central passage 101 is communicated with the air cavity 130 through the air outlet passage 103, and the air cavity 130 is communicated with the annular groove 105 through the air blowing passage 104.

In the central fire cover, during normal combustion, part of gas directly burns out fire through the fire holes 102 from the central channel 101, and the other part of gas enters the gas cavity 130 through the gas outlet channel 103 and then flows into the annular groove 105 through the gas blowing channel 104, so that a flame stabilizing ring is formed at the bottom of the annular groove 105, and not only can the gas in the fire holes 102 not be interfered to influence the combustion performance, but also the flame leaving risk can be reduced; when running into food and overflowing or oil water mixture when splashing, inside liquid can not directly flow into central fire lid, but flow into at annular groove 105 interior double bag formation liquid film, at this moment, the gas produces the extrusion in annular groove 105 top through gas blowing channel 104 in air cavity 130 to break through liquid film, make the gas normally circulate, thereby avoided the problem that fire hole 102 is blockked up.

Referring to fig. 2, 4 and 6, the lower cover 110 includes an inner wall 111, a top wall 112 and an outer wall 113, the top wall 112 and the inner wall 111 enclose the central channel 101, it should be noted that, the term "outer wall 113" refers to the case that the central fire cover is covered on the fire distributor, the exposed surface wall is the outer wall after the central fire cover is covered on the fire distributor, and the central channel 101 is used as the gas channel after the central fire cover is covered on the fire distributor. The inner wall 111, the top wall 112 and the outer wall 113 enclose to form the annular groove 105, the first hole section 1021 is located on the inner wall 111, the second hole section 1022 is located on the outer wall 113, and the air outlet channel 103 and the air blowing channel 104 are both arranged on the top wall 112. Thus, the lower cover 110 can be integrally formed, which is not only simple in structure, but also beneficial to forming the air outlet channel 103 and the air blowing channel 204.

Referring to fig. 5 and fig. 6 in combination, as an exemplary embodiment, the air outlet passage 103 includes a plurality of air outlet holes 1031, the centers of the plurality of air outlet holes 1031 are located on the same circumference D1, and the plurality of air outlet holes 1031 are distributed uniformly. Thus, when normal combustion can be avoided, too much fuel gas enters the air cavity 130 through the gas outlet channel 103 to affect the combustion performance, and it should be understood that the number and the aperture size of the gas outlet 1031 are not limited as long as the purpose of communicating the central channel 101 and the air cavity 130 can be achieved. In an embodiment not shown, the air outlet channel 103 may also be an annular through groove, so that not only the purpose of communicating the central channel 101 with the air cavity 130 is achieved, but also the structure is simple and the processing is convenient.

Further, the air blowing channel 104 includes a plurality of air inlet holes 1041, the center of the air inlet holes 1041 is located on the same circumference D2, D2 > D1, and the air inlet holes 1041 are evenly distributed. Therefore, the problem that excessive gas enters the blowing channel 104 through the air cavity 130 to affect the combustion performance during normal combustion can be avoided, and it should be understood that the number and the aperture size of the air inlet holes 1041 are not limited as long as the purpose of communicating the air cavity 130 and the annular groove 105 can be achieved. In an embodiment not shown, the air blowing channel 104 may also be an annular through groove, so that not only the purpose of communicating the air cavity 130 with the annular groove 105 is achieved, but also the structure is simple and the processing is convenient.

Referring again to FIG. 4, the thickness P of the outer sidewall 113 is 0.5mm to 3mm. For example, 0.5mm,1mm,1.5mm,2mm,2.5mm,3mm, etc., thus avoiding the problem that when the thickness is too small, the wall is easily broken or deformed when the fire hole 102 is processed, and also avoiding the problem that when the thickness is too large, the flame length is too short to effectively form the flame stabilizing effect when the flame in the annular groove 105 bypasses the outer sidewall 113.

To facilitate the formation of the air cavity 130, the top wall 112 has a central hole 1121, an outer ring 1122 located outside the air blowing passage 103, and an inner ring 1123 located between the central hole 1121 and the outer ring 1122. The upper cover body 120 has an insertion portion 121, a top portion 122 and a side portion 123, the insertion portion 121 is inserted into the central hole 1121 to be hermetically connected with the central hole 1121, for example, the insertion portion 121 may be screw-sealed, and the sealing connection may also be achieved by adding a sealing ring or the like, so that on one hand, the upper cover body 120 may be stably disposed on the lower cover body 110, and on the other hand, the air tightness of the air cavity 130 may be ensured, so that the gas in the air cavity 130 can only enter and exit from the gas outlet channel 103 and the gas blowing channel 104. Side 123 overlies outer ring 1122, top 122 has a lower surface 1221, inner ring 1123 has a top surface 11231, and a gap t is provided between lower surface 1221 and top surface 11231 to form air cavity 130. Thus, not only the upper cover body 120 can be stably seated on the lower cover body 110, but also the air chamber 130 can be formed in a simple structure.

Illustratively, the gap t is 1mm to 4mm. For example, 1mm,2mm,3mm,4mm, etc., thus not only avoiding the problem that the combustion performance is affected by too much gas accumulated in the overlarge gap, but also avoiding the problem that the extrusion force generated by the overlarge gap is too small to break the liquid film.

Illustratively, the width a of the annular groove is 1mm to 3mm. For example, 1mm,2mm,3mm and the like, so that the problems that the secondary air intake is insufficient and the gas cannot form an effective flame stabilizing ring are avoided, and the problems that the gas accumulation time is too long and the gas consumption is too large are also avoided.

In this embodiment, the air blowing channel 104 is parallel to the central axis of the central fire cover, that is, the included angle between the air blowing channel 104 and the central axis of the central fire cover is 0 °, when the central fire cover is in use, the central axis is vertical, and the air blowing channel 104 is also vertical. In this way, the gas in the gas chamber 130 is pressed above the annular groove 105 through the gas blowing passage 104, and the liquid film is more easily broken.

It should be noted that, in this embodiment, although the fire hole 102 includes two sections (i.e., the first hole section 1021 and the second hole section 1022); however, in an embodiment not shown, the fire hole 102 may have only the second hole segment 1022, in this case, the annular groove 105 divides the lower cover 110 into an inner ring body and an outer ring body (for example, the inner sidewall 111 in fig. 2 can be regarded as the inner ring body, and the outer sidewall 113 can be regarded as the outer ring body), the fire hole 102 is only arranged on the outer ring body, and during normal combustion, the gas enters the gas cavity 130 through the gas outlet channel 103, then branches through the gas blowing channel 104, one part directly combusts through the fire hole 102, and the other part flows into the annular groove 105, so that a flame stabilizing ring is formed at the bottom of the annular groove 105, thereby achieving the purpose of ensuring the combustion efficiency and reducing the risk of flame leaving.

Second embodiment

As shown in fig. 7, this embodiment has substantially the same structure as the first embodiment, and the fire holes 102, the gas outlet passages 103, the gas blowing passages 104, and the annular grooves 105 are provided on the lower cover body 110, thereby facilitating the processing. This embodiment differs from the first embodiment in that: the top wall 112 of the lower cover body 110 has a central top surface 11201 and a stepped surface 11202, the upper cover body 120 is a cover plate, the outer edge of the upper cover body 120 is supported by the stepped surface 11202 to be covered on the lower cover body 110, the upper cover body 120 has a cover body lower surface 1201, a gap is provided between the cover body lower surface 1201 and the central top surface 11201 to form the air chamber 130, the central top surface 11201 is a stepped surface, and in an embodiment not shown, the central top surface 11201 may also be a flat surface. Thus, not only can the upper cover body 120 be stably seated on the lower cover body 110, but also the air chamber 130 can be formed in a simple structure.

In addition, in the embodiment shown in fig. 7, the air outlet channel 103 is a through hole located at the center of the lower cover body 110. It should be understood that, in an embodiment not shown, the air outlet passage 103 may also include a plurality of air outlet holes 1031 as shown in the first embodiment, the centers of the plurality of air outlet holes 1031 are located on the same circumference D1, and the plurality of air outlet holes 1031 are uniformly distributed. In an embodiment not shown, the air outlet channel 103 may also be an annular through groove.

Other structures that are the same as those of the first embodiment will not be described herein.

Third embodiment

As shown in fig. 8, this embodiment has substantially the same structure as the first embodiment, and differs from the first embodiment in that: the lower cover body 110 has a lower sidewall 111', the upper cover body 120 has an upper sidewall 123' provided to surround the lower sidewall 111', the upper sidewall 123' has an inner side surface 1231', the lower sidewall 111' has an outer side surface 1111', and the air blowing passage 104 and the annular groove 105 are formed between the inner side surface 1231' and the outer side surface 1111 '. In this way, the air blowing passage 104 and the annular groove 105 can be formed in a simple manner.

In this embodiment, the fire hole 102 includes a first hole section 1021 provided on the lower sidewall 111 'and a second hole section 1022 provided on the upper sidewall 123'. Thus, partial fire holes are formed on the upper cover body 120 and the lower cover body 110, when the fuel gas is normally combusted, a part of the fuel gas can directly combust to generate fire through the fire holes 102 from the central channel 101, and the other part of the fuel gas enters the air cavity 130 through the air outlet channel 103 and then flows into the annular groove 105 through the air blowing channel 104, so that a flame stabilizing ring is formed at the bottom of the annular groove 105, and therefore, not only can the combustion efficiency be ensured, but also the flame leaving risk can be reduced.

In an embodiment not shown, the fire hole 102 may also have only the second hole section 1022 provided on the upper side wall 123', i.e., the fire hole 102 is provided on the upper side wall 123'. In this way, the fire hole 102 is formed on the upper cover 120, and during normal combustion, the gas enters the gas cavity 130 through the gas outlet channel 103, then branches through the gas blowing channel 104, one part of the gas directly combusts through the fire hole 102, and the other part of the gas flows into the annular groove 105, so that a flame stabilizing ring is formed at the bottom of the annular groove 105, and the purposes of ensuring combustion efficiency and reducing the risk of flame leaving are achieved.

Other structures that are the same as those of the first embodiment will not be described herein.

Fourth embodiment

As shown in fig. 9 and 10, this embodiment has substantially the same structure as the first embodiment, and the main difference from the first embodiment is that: the blowing channel 104 is inclined downwards and outwards from the blowing inlet 1043 to the blowing outlet 1042, so that an included angle α is formed between the blowing channel and the central axis of the central fire cover, in the embodiment shown, the included angle α is 25 °, in the embodiment not shown, the included angle α can also be 5 °,15 °,35 °,45 ° or the like, that is, the included angle α is 0 ° to 45 °, and since the central axis is vertical when the central fire cover is in use, the blowing channel 104 is arranged in such a way that the liquid film is more easily broken when the gas in the gas cavity 130 is squeezed above the annular groove 105 through the blowing channel 104.

In addition, in this embodiment, in order to form the air chamber 130 after the upper cover body 120 is covered on the lower cover body 110, the lower cover body 110 may be provided with the latch groove 114, the upper cover body 120 may be sheet-shaped, and the upper cover body 120 has the brim portion 124 that can be latched into the latch groove 114 by being deformed by squeezing.

In this embodiment, the annular groove 105 is also disposed obliquely to the central axis of the central fire cover, and has the same inclination angle as the air blowing passage 104. The air outlet passage 103 is a through hole located at the center of the lower cover 110.

Although the fire hole in this embodiment is also of an upper and lower ring structure, the upper and lower ring fire holes have different structures, as shown in fig. 10, the fire hole 102 includes two sections (i.e., a first hole section 1021 and a second hole section 1022), and the lower ring fire hole 102' has only one section.

Other structures that are the same as those of the first embodiment will not be described herein.

According to another aspect of the present invention, there is also provided a burner having a central fire cover as described above. Besides, the burner also comprises a Venturi, a distributor, a furnace end and the like. The venturi, distributor, burner, etc. may have various configurations that are currently or may become available in the future and are not intended to limit the scope of the present invention.

In the description of the present invention, it is to be understood that the directions or positional relationships indicated by the directional terms such as "upper", "lower" and "top" are generally based on the directions or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element being referred to must have a specific direction or be constructed and operated in a specific direction, and thus, should not be interpreted as limiting the scope of the present invention; the terms "inner" and "outer" refer to the interior and exterior relative to the contours of the components themselves.

For ease of description, spatially relative terms such as "over 8230 \ 8230;,"' over 8230;, \8230; upper surface "," above ", etc. may be used herein to describe the spatial relationship of one or more components or features to other components or features as illustrated in the figures. It is to be understood that the spatially relative terms are intended to encompass not only the orientation of the component as depicted in the figures, but also different orientations of the component in use or operation. For example, if an element in the drawings is turned over in its entirety, the articles "over" or "on" other elements or features will include the articles "under" or "beneath" the other elements or features. Thus, the exemplary terms "at 8230; \8230; above" may include both orientations "at 8230; \8230; above" and "at 8230; \8230; below". Further, these components or features may also be positioned at various other angles (e.g., rotated 90 degrees or other angles), all of which are intended to be encompassed herein.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, elements, components, and/or combinations thereof, unless the context clearly indicates otherwise.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

The present invention has been illustrated by the above embodiments, but it should be understood that the above embodiments are for illustrative and descriptive purposes only and are not intended to limit the invention to the scope of the described embodiments. Furthermore, it will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that many variations and modifications may be made in accordance with the teachings of the present invention, all of which fall within the scope of the present invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (17)

1. A central fire cover is provided with a central channel and a fire hole and is characterized by also comprising an air cavity, an air outlet channel, an air blowing channel and an annular groove for communicating the fire hole with the outside;

the central fire cover comprises a lower cover body and an upper cover body covered above the lower cover body, the air cavity is formed between the upper cover body and the lower cover body, the central channel is arranged on the lower cover body and is communicated with the air cavity through the air outlet channel, and the air cavity is communicated with the annular groove through the air blowing channel.

2. The fire center cover of claim 1, wherein the annular groove has a width of 1mm to 3mm.

3. The center fire cover of claim 1, wherein the air chamber has a depth t, and the depth t is 1mm to 4mm.

4. The fire center cover of claim 1, wherein the fire center cover has a central axis, and the blowing channel has an included angle of 0 ° to 45 ° with the central axis.

5. The central fire cover according to any one of claims 1 to 4, wherein the fire holes, the air outlet channel and the air blowing channel are all provided on the lower cover body, and the annular groove extends upward from the lower end of the lower cover body to communicate with the fire holes.

6. The central fire cover of claim 5 wherein said annular groove divides said fire aperture into a first aperture section and a second aperture section.

7. The fire center cover of claim 6, wherein the lower cover body comprises an inner side wall, a top wall and an outer side wall, the top wall and the inner side wall enclose to form the central channel, the inner side wall, the top wall and the outer side wall enclose to form the annular groove, the first hole section is located on the inner side wall, the second hole section is located on the outer side wall, and the air outlet channel and the air blowing channel are both arranged on the top wall.

8. The fire center cover of claim 7 wherein said top wall has a center hole, an outer ring outside said air blowing passage and an inner ring between said center hole and said outer ring; the upper cover body is provided with an insertion part, a top part and a side part, the insertion part is inserted into the central hole, the side part is overlapped on the outer ring, the top part is provided with a lower surface, the inner ring is provided with a top surface, and a gap is formed between the lower surface and the top surface to form the air cavity.

9. The central fire cover according to claim 7, wherein the air outlet channel comprises a plurality of air outlet holes, the centers of the plurality of air outlet holes are located on the same circumference D1, and the plurality of air outlet holes are uniformly distributed; the air blowing channel comprises a plurality of air inlet holes, the centers of the air inlet holes are located on the same circumference D2, D2 is larger than D1, and the air inlet holes are uniformly distributed.

10. The central fire cover of claim 7, wherein the air outlet channel is a through hole located at the center of the lower cover body; the air blowing channel comprises a plurality of air inlet holes, the centers of the plurality of air inlet holes are positioned on the same circumference D2, and the plurality of air inlet holes are uniformly distributed, or the air blowing channel is an annular through groove.

11. The central fire cover according to claim 7, wherein the air outlet passage is an annular through groove; the air blowing channel is an annular through groove.

12. The fire center cover of claim 8, wherein said insert portion is sealingly connected to said central bore by a thread and/or a gasket.

13. The center fire cover according to claim 5, wherein the annular groove divides the lower cover body into an inner ring body and an outer ring body, and the fire holes are provided on the outer ring body.

14. The fire center cover of any one of claims 1-4, wherein the lower cover body has a lower side wall, the upper cover body has an upper side wall that surrounds the lower side wall, the upper side wall has an inner side surface, the lower side wall has an outer side surface, and the air blowing channel and the annular groove are formed between the inner side surface and the outer side surface.

15. The center fire cover of claim 14 wherein said fire holes are provided in said upper side wall.

16. The center fire cover of claim 14 wherein said fire apertures include a first aperture segment disposed on said lower sidewall and a second aperture segment disposed on said upper sidewall.

17. A burner comprising a center fire cover as claimed in any one of claims 1 to 16.

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