Outer fire cover and combustor

Abstract

The embodiment of the invention discloses an outer fire cover and a burner, and relates to the technical field of gas stoves, the outer fire cover comprises an annular main body, the annular main body is provided with a fire transfer channel penetrating through the inner side and the outer side of the annular main body, and the annular main body is provided with a gas channel; the fire transfer channel comprises an inner side section and an outer side section which are sequentially arranged from inside to outside, and the diameter of the outer side section is larger than that of the inner side section; a plurality of fire transfer holes communicated with the fuel gas channel are sequentially formed in the inner wall of the fire transfer channel from inside to outside, and the upper end faces of the fire transfer holes are higher than the bottom of the fire transfer channel. On one hand, the diameter of the inner side section is smaller than that of the outer side section, through the design of the stepped hole, precise control over the gas flow speed is achieved, stable flame transmission is ensured, and the ignition success rate is increased; and on the other hand, the small-diameter inner side section can effectively limit overflow liquid from entering, meanwhile, the flash holes are formed in a high position, overflow liquid can be effectively prevented from entering the flash holes, and the flash holes are effectively prevented from being blocked.

Description

Technical Field

[0001] The invention relates to the technical field of gas stoves, and in particular to an outer fire cover and a burner. Background Art

[0002] In the field of gas stove burners, the design of the fire transfer channel of the outer fire cover directly affects the combustion stability and anti-clogging performance. Traditional outer fire covers generally adopt a top open gap fire transfer solution, and a through narrow gap is opened on the top of the outer fire cover through mechanical processing as a fire transfer channel. Although this type of structure can achieve continuous ignition of the outer ring fire hole, it exposes significant defects in actual use: because the fire transfer gap is completely exposed to the surface of the burner, liquid substances such as soup and grease that overflow during cooking can easily penetrate into the channel along the edge of the gap, forming a viscous residue accumulation. Over time, such pollutants will gradually block the fire transfer path, resulting in problems such as ignition delay and flame transmission interruption, and in severe cases, even causing the burner to fail completely.

[0003] In order to solve the problem of easy clogging of the above-mentioned fire transfer channel, the industry began to explore the design of hidden fire transfer channel. For example, the outer ring fire cover of the gas burner disclosed in patent CN208170385U, by setting an annular fire transfer groove inside the fire cover, and changing the traditional narrow and long gap into a circular hole structure with a larger diameter, the fire transfer path is transformed from open on the surface to closed inside. Similarly, patent CN210861101U proposes to set a sunken fire transfer hole at the bottom of the fire cover, trying to reduce the probability of overflow contact by changing the spatial layout of the fire transfer channel. Although these improvement schemes have improved the anti-clogging ability to a certain extent, after long-term verification, the following technical contradictions still exist: although the increased fire transfer diameter can delay the initial clogging process, the excessive opening size provides a smoother entry channel for solid foreign matter such as debris and food residues. As the use time accumulates, the amount of foreign matter deposited in the channel will show a nonlinear growth.

[0004] The above technical contradictions expose the core defects of the current fire transmission channel: the geometric optimization of the fire transmission channel and the improvement of anti-blocking performance have failed to form a synergistic effect. How to build a three-dimensional protection system with good anti-blocking ability while ensuring the flame transmission efficiency has become one of the key factors restricting the development of gas stove fire cover technology. Summary of the invention

[0005] The technical problem to be solved by the embodiments of the present invention is how to improve the anti-blocking performance under the premise of ensuring the flame transfer efficiency.

[0006] In order to solve the above problems, in the first aspect, an embodiment of the present invention proposes an external fire cover, which includes an annular main body, the annular main body is provided with a fire transfer channel running through the inner and outer sides of the annular main body, and the annular main body is provided with a gas channel; the fire transfer channel includes an inner section and an outer section arranged in sequence from the inside to the outside, and the diameter of the outer section is larger than the diameter of the inner section; the inner wall of the fire transfer channel is provided with a plurality of fire transfer holes connected to the gas channel in sequence from the inside to the outside, and the height of the upper end surface of the fire transfer hole is higher than the bottom of the fire transfer channel.

[0007] A further technical solution is that the height difference between the upper end surface of the fire transfer hole and the bottom of the fire transfer channel is greater than 1 mm.

[0008] A further technical solution is that the diameter of the inner section is greater than 3 mm.

[0009] A further technical solution is that there is a smooth transition between the inner section and the outer section.

[0010] A further technical solution is that a plurality of main fire holes are provided on the outer side of the annular body, and the main fire holes are connected to the gas channel.

[0011] A further technical solution is that a flame stabilizing groove is provided on the outer side of the annular body, the flame stabilizing groove is connected to the main fire hole, the flame stabilizing groove is located at the lower side of the main fire hole, a lower flame stabilizing hole is provided on the lower side of the flame stabilizing groove, and the lower flame stabilizing hole is connected to the gas channel.

[0012] A further technical solution is that a buffer groove connected to the flame stabilizing groove is provided at the opening of the outer section, and the width of the buffer groove is greater than that of the flame stabilizing groove.

[0013] A further technical solution is that an upper flame stabilizing hole is provided on the outer side of the annular body, the upper flame stabilizing hole is located on the outer side of the main fire hole, and the upper flame stabilizing hole is connected to the gas channel.

[0014] A further technical solution is that there are multiple upper flame-stabilizing holes, which are evenly distributed on the outside of the annular body; there are multiple lower flame-stabilizing holes, which are evenly distributed on the lower side of the flame-stabilizing groove.

[0015] In a second aspect, an embodiment of the present invention provides a burner, wherein the burner comprises the outer fire cover as described in the first aspect.

[0016] Compared with the prior art, the technical effects achieved by the embodiments of the present invention include: The embodiment of the present invention proposes an external fire cover, the external fire cover comprises an annular body, the annular body is provided with a fire transfer channel penetrating the inner and outer sides of the annular body, the annular body is provided with a gas channel; the fire transfer channel comprises an inner section and an outer section arranged in sequence from the inside to the outside, the diameter of the outer section is greater than the diameter of the inner section; the inner wall of the fire transfer channel is provided with a plurality of fire transfer holes connected to the gas channel in sequence from the inside to the outside, the height of the upper end surface of the fire transfer hole is higher than the bottom of the fire transfer channel. On the one hand, the diameters of the inner section and the outer section of the fire transfer channel are different, the diameter of the inner section is smaller than the diameter of the outer section, and through the stepped hole design, the gas flow rate is precisely controlled, stable flame transfer is ensured, and the success rate of ignition is improved; on the other hand, the small diameter of the inner section can effectively limit the entry of overflow, and the high-position arrangement of the fire transfer hole can effectively prevent the overflow from entering the fire transfer hole, so that the overflow can flow away along the bottom of the fire transfer channel, thereby effectively avoiding the blockage of the fire transfer hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0019] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0020] Figure 1 A schematic diagram of the structure of an external fire cover proposed in an embodiment of the present invention; Figure 2 Another structural schematic diagram of an outer fire cover proposed in an embodiment of the present invention; Figure 3 A schematic structural diagram of the back side of an outer fire cover proposed in an embodiment of the present invention; Figure 4 A cross-sectional view of an outer fire cover proposed in an embodiment of the present invention; Figure 5 Another cross-sectional view of an outer fire cover provided by an embodiment of the present invention; Figure 6 A schematic diagram of disassembling the outer fire cover from the fire distributor according to an embodiment of the present invention.

[0021] Reference numerals Fire distributor 100, gas distributor groove 110, inner fire cover 200, annular main body 10, fire transfer channel 20, gas channel 30, inner section 21, outer section 22, main fire hole 40, flame stabilizing groove 50, lower flame stabilizing hole 60, buffer groove 70, upper flame stabilizing hole 80, inner fire transfer hole 91, middle fire transfer hole 92 and outer fire transfer hole 93. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Similar component numbers in the drawings represent similar components. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0024] It should also be understood that the terms used in this description of the embodiments of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the embodiments of the present invention. As used in the description of the embodiments of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms of "a", "an" and "the" are intended to include plural forms.

[0025] See also Figure 1-Figure 6 In an embodiment of the present invention, an external fire cover is provided, which can effectively prevent the fire transmission hole from being blocked while ensuring the stable transmission of flame. In order to achieve the above technical effects, the external fire cover includes an annular main body 10, and the specific structure is described as follows: The annular body 10 is in the shape of a ring, and the annular hole in the center is used for placing the inner fire cover 200.

[0026] The annular body 10 is provided with a fire transfer channel 20 penetrating the inner and outer sides of the annular body 10, and the annular body 10 is provided with a gas channel 30. The fire transfer channel 20 is used to transfer the fire on the inner fire cover 200. The gas channel 30 is used to pass the gas, and the gas can be distributed by the fire distributor 100.

[0027] In the present invention, the flame transfer passage 20 includes an inner section 21 and an outer section 22 arranged in sequence from inside to outside. The diameter of the outer section 22 is larger than that of the inner section 21, that is, a stepped arrangement is formed between the inner section 21 and the outer section 22.

[0028] The diameter D1 of the inner section 21 is relatively small (3 mm < D1 < D2), which can effectively limit the entry of overflow liquid. The length of the inner section 21 is L1 (L1 < L, where L is the total length of the flame transfer passage 20); the diameter D2 of the outer section 22 is relatively large (D2 > D1) to ensure air circulation and flame stability. At the same time, through experimental verification by the inventor, when the diameter D1 of the inner section 21 is greater than 3 mm, the flame on the inner fire cap 200 can reliably enter the inner section 21, thus ensuring reliable ignition.

[0029] Specifically, the diameters of the inner section 21 and the outer section 22 are different, and the coordinated control of the gas flow rate and pressure is realized through the principle of fluid mechanics. Since the diameter of the inner section 21 is relatively small, when the gas flows from the outer section 22 into the inner section 21, the frictional resistance loss along the way increases, the total pressure drops, part of the gas kinetic energy is converted into heat energy, and the gas flow rate decreases significantly. Therefore, the gas is more easily ignited by the inner ring flame; further, when the flame enters the outer section 22 from the inner section 21, the flow rate decreases due to the enlarged cross-sectional area, and the static pressure recovery effect forms a stable low-pressure area, which anchors the flame at the outlet of the outer section 22 of the flame transfer hole, avoiding flame lift-off, increasing the stable combustion range, and improving the user experience.

[0030] Further, a plurality of flame transfer holes communicating with the gas passage 30 are sequentially provided on the inner wall of the flame transfer passage 20 from inside to outside. The height of the upper end surface of the flame transfer hole is higher than the bottom of the flame transfer passage 20. The flame transfer holes are used to introduce gas into the flame transfer passage 20.

[0031] See Figure 2 And in combination with Figure 6 , the connection mode between the flame transfer holes and the gas passage 30 is described as follows: The gas passage 30 can specifically be a groove on the lower side of the annular main body 10. An air distribution groove 110 is provided on the upper side of the distributor 100. The lower side of the outer fire cap is hermetically covered on the air distribution groove 110 of the distributor 100. The flame transfer passage 20 is spatially connected to the air distribution groove 110. At the same time, the air distribution groove 110 is located below the flame transfer holes, and the air distribution groove 110 is connected to the flame transfer holes. Therefore, the flame transfer holes can be connected to the gas passage 30 through the air distribution groove 110. The distributor outputs gas into the air distribution groove 110, so that the gas enters the gas passage 30.

[0032] Specifically, the inner wall of the fire transfer channel 20 is provided with a plurality of fire transfer holes, and the height of the upper end surface of the fire transfer hole is higher than the bottom of the fire transfer channel 20. When liquid enters the fire transfer channel 20, it is ensured that the overflow flows out of the outer ring along the bottom of the fire transfer channel 20 under the action of gravity, and the overflow is prevented from contacting the fire transfer holes, and the fire transfer holes are directly covered and blocked, which effectively reduces the probability of the fire transfer holes being blocked.

[0033] The plurality of fire transfer holes include an inner fire transfer hole 91, a middle fire transfer hole 92 and an outer fire transfer hole 93 arranged from the inside to the outside. Among them, the outlet of the inner fire transfer hole 91 is in the inner section 21, and the number of the inner fire transfer holes 91 is several, and the inclination angle a1 thereof is between 0° and 90°. The mixed gas flows from the gas channel 30 into the inner fire transfer hole 91, and contacts the combustion flame of the inner fire cover 200 at the outlet, and ignites the flame of the inner fire cover 200 to the inner section 21.

[0034] The outlet of the middle fire transfer hole 92 is in the inner section 21 or the outer section 22 , and there are several of them. The inclination angle a2 is between 0° and 180°. Its function is to ignite the flame of the inner section 21 to the middle of the fire transfer channel 20 .

[0035] The outlets of the external fire holes 93 are located in the outer section 22, and there are several of them. The inclination angle a3 is between 0° and 90°. Their function is to ignite the flame in the middle of the fire channel 20 to the outside of the fire channel 20, thereby igniting all the fire holes of the external fire cover.

[0036] It should be noted that the inclination angle of the fire transfer hole refers to the angle between the axis of the fire transfer hole and the axis of the fire transfer channel 20. Usually, the inner fire transfer hole 91 is inclined toward the inner side of the fire transfer channel 20, the outer fire transfer hole 93 is inclined toward the outer side of the fire transfer channel 20, and the middle fire transfer hole 92 can be inclined toward the inner side of the fire transfer channel 20 or toward the outer side of the fire transfer channel 20.

[0037] An embodiment of the present invention provides an external fire cover, which includes an annular main body 10, wherein the annular main body 10 is provided with a fire transfer channel 20 that runs through the inner and outer sides of the annular main body 10, and the annular main body 10 is provided with a gas channel 30; the fire transfer channel 20 includes an inner section 21 and an outer section 22 that are sequentially arranged from the inside to the outside, and the diameter of the outer section 22 is larger than the diameter of the inner section 21; the inner wall of the fire transfer channel 20 is sequentially provided with a plurality of fire transfer holes that are connected to the gas channel 30 from the inside to the outside, and the height of the upper end surface of the fire transfer hole is higher than the bottom of the fire transfer channel 20. On the one hand, the diameters of the inner section 21 and the outer section 22 of the fire transfer channel 20 are different. The diameter of the inner section 21 is smaller than that of the outer section 22. The stepped hole design can achieve precise control of the gas flow rate, ensure stable flame transfer, and improve the ignition success rate. On the other hand, the small diameter of the inner section 21 can effectively limit the entry of overflow liquid. At the same time, the high-position arrangement of the fire transfer holes can effectively prevent overflow liquid from entering the fire transfer holes, so that the overflow liquid can flow along the bottom of the fire transfer channel 20, thereby effectively preventing the fire transfer holes from being blocked.

[0038] Furthermore, in some embodiments, such as the present embodiment, a height difference H between an upper end surface of the fire transfer hole and a bottom of the fire transfer channel 20 is greater than 1 mm.

[0039] For example, the height difference H between the upper end surface of the fire transfer hole and the bottom of the fire transfer channel 20 is 2mm, 3mm or 4mm, which is not specifically limited in the present invention. The upper end surface of the fire transfer hole can be specifically opened in the upper half of the fire transfer channel 20, so as to effectively avoid being blocked by overflow liquid.

[0040] It has been verified through experiments that when the overflow liquid flows through the bottom of the fire transfer channel 20, its liquid level is usually less than 1 mm. Therefore, when the height difference H between the upper end surface of the fire transfer hole and the bottom of the fire transfer channel 20 is greater than 1 mm, most of the overflow liquid can be prevented from entering the fire transfer hole, thereby effectively preventing the fire transfer hole from being blocked.

[0041] Further, in some embodiments, such as the present embodiment, the diameter of the inner section 21 is greater than 3 mm and smaller than the diameter of the outer section 22. For example, the diameter of the inner section 21 may be 3.5 mm, which is not specifically limited in the present invention. The diameter of the inner section 21 is greater than 3 mm, which can achieve stable flame transfer.

[0042] Furthermore, in some embodiments, such as the present embodiment, the inner section 21 and the outer section 22 have a smooth transition, thereby effectively reducing fluid resistance. For example, the inner section 21 and the outer section 22 may have a conical or arcuate transition.

[0043] Furthermore, in some embodiments, such as the present embodiment, a plurality of main fire holes 40 are provided on the outer side of the annular body 10, and the main fire holes 40 are communicated with the gas channel 30. The main fire holes 40 are used to output the gas.

[0044] Further, a flame stabilizing groove 50 is provided on the outer side of the annular body 10, and the flame stabilizing groove 50 is communicated with the main fire hole 40 (for example, a communication channel is provided between the flame stabilizing groove 50 and the main fire hole 40), and the flame stabilizing groove 50 is located at the lower side of the main fire hole 40, and a lower flame stabilizing hole 60 is provided at the lower side of the flame stabilizing groove 50, and the lower flame stabilizing hole 60 is communicated with the gas channel 30. The flame stabilizing groove 50 is used to form a stable fire source at the lower side of the main fire hole 40, so as to reliably ignite the gas coming out of the main fire hole 40.

[0045] Furthermore, a buffer groove 70 connected to the flame stabilizing groove 50 is provided at the opening of the outer section 22 , and the width of the buffer groove 70 is greater than that of the flame stabilizing groove 50 .

[0046] Specifically, a buffer groove 70 is provided at the outlet of the outer section 22, and its shape is arc, square or other shapes. The buffer groove 70 is connected with the flame stabilizing groove 50. When the burning flame passes through the buffer groove 70, the cross-sectional area is enlarged, the flame propagation speed becomes slower, and it is not easy to separate the flame. At the same time, the buffer groove 70 also connects the outlet of the outer section 22 with several lower flame stabilizing holes 60 next to it, so that the flame in the fire transfer structure can be more easily transferred to the lower flame stabilizing holes 60, thereby improving the ignition success rate.

[0047] Furthermore, an upper flame stabilization hole 80 is provided on the outer side of the annular body 10, and the upper flame stabilization hole 80 is located on the outer side of the main fire hole 40, and the upper flame stabilization hole 80 is connected to the gas channel 30. The diameters of the upper flame stabilization hole 80 and the lower flame stabilization hole 60 are smaller than the diameter of the main fire hole 40. The upper flame stabilization hole 80 is used to form a stable fire source beside the main fire hole 40, so as to reliably ignite the gas coming out of the main fire hole 40.

[0048] Furthermore, there are multiple upper flame-stabilizing holes 80 , which are evenly distributed on the outside of the annular body 10 ; there are multiple lower flame-stabilizing holes 60 , which are evenly distributed on the lower side of the flame-stabilizing groove 50 .

[0049] By evenly arranging a plurality of upper flame stabilizing holes 80 and a plurality of lower flame stabilizing holes 60 , the reliability of igniting the gas coming out of the main flame hole 40 can be greatly improved.

[0050] An embodiment of the present invention provides a burner, comprising the outer fire cover as provided in any of the above embodiments.

[0051] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0052] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0053] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0054] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be connected, detachably connected, or integrated; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0056] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

[0057] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

[0058] The above is a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. An external fire cover, characterized in that: It comprises an annular body, wherein the annular body is provided with a fire transfer channel which runs through the inner side and the outer side of the annular body, and the annular body is provided with a gas channel; the fire transfer channel comprises an inner section and an outer section which are arranged in sequence from the inside to the outside, and the diameter of the outer section is larger than the diameter of the inner section; the inner wall of the fire transfer channel is provided with a plurality of fire transfer holes which are connected with the gas channel in sequence from the inside to the outside, and the height of the upper end surface of the fire transfer hole is higher than the bottom of the fire transfer channel.

2. The outer fire cover according to claim 1, characterized in that: The height difference between the upper end surface of the fire transfer hole and the bottom of the fire transfer channel is greater than 1 mm.

3. The outer fire cover according to claim 1, characterized in that: The diameter of the inner section is greater than 3 mm.

4. The outer fire cover according to claim 1, characterized in that: The inner section and the outer section have a smooth transition.

5. The outer fire cover according to claim 1, characterized in that: A plurality of main fire holes are arranged on the outer side of the annular body, and the main fire holes are communicated with the gas channel.

6. The outer fire cover according to claim 5, characterized in that: A flame stabilizing groove is provided on the outer side of the annular body, the flame stabilizing groove is connected to the main fire hole, the flame stabilizing groove is located at the lower side of the main fire hole, a lower flame stabilizing hole is provided at the lower side of the flame stabilizing groove, and the lower flame stabilizing hole is connected to the gas channel.

7. The outer fire cover according to claim 6, characterized in that: A buffer groove connected to the flame stabilizing groove is provided at the opening of the outer section, and the width of the buffer groove is greater than that of the flame stabilizing groove.

8. The outer fire cover according to claim 6, characterized in that: An upper flame stabilizing hole is provided on the outer side of the annular body, the upper flame stabilizing hole is located on the outer side of the main fire hole, and the upper flame stabilizing hole is communicated with the gas channel.

9. The outer fire cover according to claim 8, characterized in that: There are multiple upper flame-stabilizing holes, which are evenly distributed on the outside of the annular body; there are multiple lower flame-stabilizing holes, which are evenly distributed on the lower side of the flame-stabilizing groove.

10. A burner, characterized in that: The burner comprises an outer fire cover as claimed in any one of claims 1-9.

Images