Outer ring fire cover and combustor

Abstract

The outer ring fire cover comprises a fire cover body, a plurality of fire hole sets are formed in the outer side of the outer wall of the fire cover body in the circumferential direction, each fire hole set comprises a plurality of main fire holes formed at intervals, the outer side face of the fire cover body is provided with a flame stabilizing groove, an opening of the flame stabilizing groove faces outwards, and the flame stabilizing groove extends in the circumferential direction. The flame stabilizing groove is located below the main fire holes, a plurality of lower flame stabilizing holes arranged at intervals are formed in the inner side of the outer wall of the fire cover body in the circumferential direction, the lower flame stabilizing holes are communicated with the flame stabilizing groove, and the flame stabilizing groove is communicated with the main fire holes. According to the outer ring fire cover and the burner, the flame stabilizing grooves are connected with the lower flame stabilizing holes, small flames for stable combustion are formed by fuel gas at the flame stabilizing grooves, the probability of flame separation and backfire of the main fire holes is reduced, and the stable combustion range is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of burners, in particular to an outer ring fire cover and a burner. Background Art

[0002] The outer ring fire cover is a component of a gas stove, used to transmit gas to the circumferential side wall of the outer ring fire cover. When ignited, an annular fire ring is formed around the circumference of the outer ring fire cover. In related art, the fire cover of a gas stove includes an outer ring fire cover and an inner ring fire cover. A pulse igniter is provided between the outer ring fire cover and the inner ring fire cover. The pulse igniter is used to ignite the inner ring fire cover. The outer ring fire cover is provided with an ignition groove, and one side of the ignition groove is opened toward the inner ring fire cover. When the gas fills the outer ring fire cover and overflows from the ignition groove, the open flame on the inner ring fire cover can be ignited by the gas overflowing from the ignition groove, and the flame gradually spreads to the outer ring fire cover until it ignites the gas ejected from the outer wall of the outer ring fire cover, forming an annular fire wall.

[0003] Currently, most fire covers on the market are made of stainless steel. Stainless steel fire covers are very hard, and the thicker they are, the more difficult they are to shape. Therefore, the thickness of stainless steel fire covers is generally around 3-4mm. This results in a very short flame hole on the stainless steel fire cover, which is prone to flameout and tempering, greatly reducing the stable combustion range. Due to the high hardness of stainless steel fire covers, drilling holes is difficult, especially holes with smaller diameters, as the drill bit is very easy to break. Therefore, the diameter of existing fire holes is generally not less than 1.5mm, resulting in a poor flame stabilization effect of the flame stabilization hole, which further leads to severe flameout and tempering.

[0004] In order to solve the flame separation problem, the stainless steel burner will add a baffle at the inlet of the pilot gas outside the ignition distributor to reduce the flow rate of the gas, but it will also reduce the injection performance of the injector tube, resulting in a decrease in the thermal efficiency of the burner. Utility Model Content

[0005] In view of this, an object of the present invention is to provide an outer ring fire cover which can reduce flame lift and flashback.

[0006] The technical solution used in the present invention is: to provide an outer ring fire cover, including a fire cover body, a plurality of fire hole groups are provided on the circumferential direction of the outer side of the outer wall of the fire cover body, each fire hole group includes a plurality of main fire holes arranged at intervals, the outer side surface of the fire cover body has a flame stabilizing groove with an opening facing outward and extending circumferentially, the flame stabilizing groove is located below the main fire hole, and a plurality of lower flame stabilizing holes are provided on the circumferential direction of the inner side of the outer wall of the fire cover body, the lower flame stabilizing holes are connected to the flame stabilizing groove, and the flame stabilizing groove is connected to the main fire hole.

[0007] Preferably, the multiple fire hole groups include a first fire hole group and a second fire hole group, the circumferential spacing between the first fire hole group and the second fire hole group is w1, the circumferential spacing between adjacent main fire holes in the fire hole group is w2, and w1 is greater than w2.

[0008] Preferably, the plurality of fire hole groups further include a third fire hole group and a fourth fire hole group, the circumferential spacing between adjacent fire hole groups is the same, and w1 is at least twice w2.

[0009] Preferably, a plurality of upper flame-stabilizing holes are provided at intervals on the circumferential direction of the outer side of the outer wall of the fire cover body, the aperture of the upper flame-stabilizing holes is smaller than the aperture of the main fire hole, the plurality of upper flame-stabilizing holes located in the space of the fire hole group are separated from each other by the main fire hole, and the plurality of upper flame-stabilizing holes located in the interval range of adjacent fire hole groups are adjacent to each other.

[0010] Preferably, there are at least three upper flame stabilizing holes located within the interval between adjacent fire hole groups.

[0011] Preferably, one of the fire hole groups includes, in addition to multiple main fire holes, multiple continuously arranged secondary fire holes, the aperture of the secondary fire holes is smaller than the aperture of the main fire holes, and the fire cover body is provided with multiple upper flame-stabilizing holes arranged at intervals on the circumferential outer wall, the aperture of the upper flame-stabilizing holes is smaller than the aperture of the secondary fire holes, the multiple upper flame-stabilizing holes located in the fire hole group space are separated from each other by the main fire hole or the secondary fire hole, and the multiple upper flame-stabilizing holes located in the interval range of adjacent fire hole groups are adjacent to each other, and the aperture of the secondary fire hole is 2.0-2.5mm.

[0012] Preferably, the width of the flame stabilizing groove is 0.7-1 mm; the aperture of the lower flame stabilizing hole is 1.2-1.5 mm; and the aperture of the main flame hole is 2.5-2.8 mm.

[0013] Preferably, the main fire hole passes through the outer wall of the fire cover body, and a plurality of upper flame stabilization holes are arranged at intervals on the circumferential direction of the outer side of the outer wall of the fire cover body. The upper flame stabilization holes pass through the outer wall of the fire cover body, and the lower flame stabilization holes do not pass through the outer wall of the fire cover body. The plurality of lower flame stabilization holes are located below the plurality of main fire holes. The plurality of lower flame stabilization holes include a first lower flame stabilization group and a second lower flame stabilization group. The adjacent spacing of the plurality of lower flame stabilization holes in the first lower flame stabilization group is smaller, and the adjacent spacing of the plurality of lower flame stabilization holes in the second lower flame stabilization group is larger. The first lower flame stabilization group is located below the range of the fire hole group interval, and the second lower flame stabilization group is located below the fire hole group.

[0014] The utility model also provides a burner, including the outer ring fire cover, the outer ejector tube and the inner ejector tube of the ignition divider, the ignition divider including the outer ring gas channel and the inner ring gas channel, the outer ejector tube is connected to the outer ring gas channel, the inner ejector tube is connected to the inner ring gas channel, the outer ring fire cover is connected to the top of the ignition divider, the gas flow channel is formed between the outer ring fire cover and the ignition divider, and the outer ejector tube outlet is connected to the gas flow channel.

[0015] Preferably, the outer ring fire cover is provided with a plurality of 4-9 secondary fire holes at the outlet of the outer ejector tube, and the aperture of the secondary fire holes is smaller than the aperture of the main fire hole.

[0016] The outer ring fire cover and burner provided by the utility model are connected with the lower flame stabilizing hole through the flame stabilizing groove. The gas forms a small flame with stable combustion in the flame stabilizing groove, reduces the probability of flame separation and backfire in the main fire hole, and increases the stable combustion range. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and other purposes, features and advantages of the present invention will become more apparent through a more detailed description of the preferred embodiments of the present invention shown in the accompanying drawings. The same reference numerals indicate the same parts throughout the drawings, and the drawings are not intentionally scaled to actual size. The emphasis is on illustrating the subject matter of the present invention.

[0018] Figure 1 This is a schematic structural diagram of the outer ring fire cover provided by the utility model at the first angle.

[0019] Figure 2 This is a schematic diagram of the structure of the outer ring fire cover provided by the utility model at the second angle.

[0020] Figure 3 This is a schematic diagram of the structure of the outer ring fire cover provided by the utility model at the third angle.

[0021] Figure 4 A schematic structural diagram of a burner provided by the utility model.

[0022] Figure 5 This is a schematic diagram of the cross-sectional structure of the outer ring fire cover provided for the utility model. DETAILED DESCRIPTION

[0023] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it. However, the embodiments given do not limit the present invention. In this embodiment, it should be understood that the directions or positional relationships indicated by terms such as "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", and "outside" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention.

[0024] It should be noted that when an element is considered to be "connected" to another element, it may be directly connected to the other element and integrated therewith, or there may be an intermediate element. The terms "mounted," "one end," "the other end," and similar expressions used in this invention are for illustrative purposes only.

[0025] Please refer to Figures 1 to 5 The present invention provides an outer ring fire cover, including a fire cover body 90, and a plurality of fire hole groups 91 are provided on the circumferential direction of the outer side of the outer wall of the fire cover body 90. Each fire hole group 91 includes a plurality of main fire holes 911 arranged at intervals. The outer side surface of the fire cover body 90 has a flame stabilizing groove 92 with an opening facing outward and extending circumferentially. The flame stabilizing groove 92 is located below the main fire hole 911. A plurality of lower flame stabilizing holes 94 are provided on the circumferential direction of the inner side of the outer wall of the fire cover body 90. The lower flame stabilizing holes 94 are connected to the flame stabilizing groove, and the flame stabilizing groove 92 is connected to the main fire hole 911.

[0026] The outer ring fire cover provided by the present invention forms a large flame of stable combustion at the main fire hole, which is used to heat cooking utensils. The gas is connected to the lower flame stabilizing hole 94 through the flame stabilizing groove 92, and forms a small flame of stable combustion at the flame stabilizing groove 92, which reduces the probability of flame separation and backfire in the main fire hole and increases the stable combustion range.

[0027] refer to Figure 2 In a preferred embodiment, the multiple fire hole groups 91 include a first fire hole group and a second fire hole group. The circumferential spacing between the first and second fire hole groups is w1, and the circumferential spacing between adjacent primary fire holes within a fire hole group is w2, with w1 being greater than w2. The present invention eliminates 2-4 primary fire holes every 90°, forming multiple fire hole groups 91. Primary fire holes 911 are eliminated in the spaces between adjacent fire hole groups 91, resulting in a greater circumferential spacing between adjacent fire hole groups than between adjacent primary fire holes within a fire hole group. This arrangement prevents flames between adjacent fire hole groups from burning the pot support, which could reduce efficiency and increase smoke.

[0028] refer to Figure 2In a further preferred embodiment, the plurality of fire hole groups 91 further include a third fire hole group and a fourth fire hole group, and the circumferential spacing w1 of adjacent fire hole groups is the same, and w1 is at least twice that of w2.

[0029] refer to Figure 1-2 In a preferred embodiment, a plurality of upper flame-stabilizing holes 93 are further provided on the circumferential outer wall of the fire cover body 90. The plurality of upper flame-stabilizing holes 93 located in the space of the fire hole group are separated from each other by the main fire hole 911, and the plurality of upper flame-stabilizing holes 93 located in the interval range of adjacent fire hole groups are adjacent to each other, that is, there is no main fire hole 911 in the interval range of adjacent fire hole groups, so the upper flame-stabilizing holes 93 in this range will not be separated by the main fire hole 911. Through the cooperation of the upper flame-stabilizing holes 93, firstly, the stable combustion range of the main fire hole 911 is increased, and it is not easy to separate the flame and burn out. Secondly, the unburned gas above the main fire hole 911 is re-ignited, which improves the thermal efficiency and reduces the smoke. Through the structure of the lower flame-stabilizing hole and the upper flame-stabilizing hole, the stable combustion range of the fire cover is greatly increased, and the flame separation and backfire problems of the stainless steel fire cover are effectively solved.

[0030] refer to Figure 2 In a further preferred embodiment, the number of upper flame stabilization holes 93 located within the interval between adjacent fire hole groups is at least 3.

[0031] refer to Figure 3 In a preferred embodiment, in addition to the multiple main fire holes 911, one of the fire hole groups 91 also includes multiple consecutively arranged secondary fire holes 912. The aperture of the secondary fire holes 912 is smaller than that of the main fire holes 911. A plurality of upper flame stabilization holes 93 are also provided on the circumferential outer wall of the fire cover body. The multiple upper flame stabilization holes 93 located in the space of the fire hole group 91 are separated from each other by the main fire holes 911 or the secondary fire holes 912. The multiple upper flame stabilization holes 93 located in the interval range of adjacent fire hole groups 91 are adjacent to each other. There are 4-9 secondary main fire holes 912 directly above the outlet of the external ejector tube. The aperture of the secondary main fire holes 912 is smaller than that of the main fire holes 911. The aperture of the secondary fire holes 912 is 2.0-2.5mm. Because the gas outlet speed at this location is faster and the flame is longer than that at other locations, reducing the aperture can reduce the gas outlet speed of the fire holes at this location, making the combustion flame of the fire holes of the entire fire cover uniform. The aperture of the upper flame stabilizing hole 93 is smaller than the aperture of the auxiliary flame hole 912 , and the aperture of the upper flame stabilizing hole 93 is smaller than the aperture of the main flame hole 911 .

[0032] In a preferred embodiment, the width of the flame stabilization groove is 0.7-1mm; the aperture of the lower flame stabilization hole 94 is 1.2-1.5mm; and the aperture of the main flame hole 911 is 2.5-2.8mm. This utility model achieves rapid ignition through the reasonably sized, large-diameter main flame hole 911. Simultaneously, the smaller aperture of the lower flame stabilization hole 94 and the flame stabilization groove allow the gas to form a small, stable flame in the flame stabilization groove 92, reducing the probability of flame separation and flashback at the main flame hole and increasing the range of stable combustion.

[0033] refer to Figure 2 In a preferred embodiment, the main fire hole 911 passes through the outer wall of the fire cover body, and a plurality of upper flame-stabilizing holes 93 are provided in the circumferential direction of the outer side of the outer wall of the fire cover body. The upper flame-stabilizing holes 93 pass through the outer wall of the fire cover body, and the lower flame-stabilizing holes 94 do not pass through the outer wall of the fire cover body. The plurality of lower flame-stabilizing holes 94 are located below the plurality of main fire holes 911. The plurality of lower flame-stabilizing holes include a first lower flame-stabilizing group 941 and a second lower flame-stabilizing group 942. The adjacent spacing between the plurality of lower flame-stabilizing holes 94 in the first lower flame-stabilizing group 941 is small, and the adjacent spacing between the plurality of lower flame-stabilizing holes 94 in the second lower flame-stabilizing group 942 is large. The first lower flame-stabilizing group 941 is located in the range of the interval between the fire hole groups 91 (that is, the area without the main fire hole 911, such as Figure 2 Below the middle W1 distance), the second lower flame stabilizing group 942 is located below the fire hole group.

[0034] The utility model also has an upper flame-stabilizing hole located at the top. The functions of the upper flame-stabilizing hole are: first, to increase the stable combustion range of the main fire hole, which is not easy to separate the flame and lose the fire; second, to reignite the unburned gas above the main fire hole, thereby improving thermal efficiency and reducing smoke.

[0035] refer to Figure 4 The present invention also provides a burner, including an outer ring fire cover, an outer ejector tube 20a and an inner ejector tube 20b of a ignition divider 40 according to any one of the above embodiments, the ignition divider 40 includes an outer ring gas channel and an inner ring gas channel, the outer ejector tube 20a is connected to the outer ring gas channel, the inner ejector tube 20b is connected to the inner ring gas channel, the outer ring fire cover is connected to the top of the ignition divider 40, a gas flow channel is formed between the outer ring fire cover and the ignition divider 40, and the outlet of the outer ejector tube 20a is connected to the gas flow channel.

[0036] refer to Figure 4 In a preferred embodiment, the outer ring flame cover is equipped with 4-9 secondary flame holes 912 at the exit of the outer ejection tube 20a. The aperture of the secondary flame holes 912 is smaller than that of the primary flame hole 911. By designing 4-9 secondary primary flame holes, the baffle structure inside the stainless steel flame cover can be eliminated, thereby enhancing the ejection performance of the burner.

[0037] In this specification, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it can mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it can mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0038] In the description of this specification, the description with reference to the terms "preferred embodiment", "further embodiment", "other embodiments" or "specific example" 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 application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0039] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. An outer ring fire cover, characterized in that: It includes a fire cover body, and a plurality of fire hole groups are provided on the circumferential direction of the outer side of the outer wall of the fire cover body, and each fire hole group includes a plurality of main fire holes arranged at intervals. The outer side surface of the fire cover body has a flame stabilizing groove with an opening facing outward and extending circumferentially, and the flame stabilizing groove is located below the main fire hole. A plurality of lower flame stabilizing holes are provided on the circumferential side of the inner side of the outer wall of the fire cover body, and the lower flame stabilizing holes are connected with the flame stabilizing groove, and the flame stabilizing groove is connected with the main fire hole.

2. The outer ring fire cover according to claim 1, characterized in that: The multiple fire hole groups include a first fire hole group and a second fire hole group. The circumferential spacing between the first fire hole group and the second fire hole group is w1. The circumferential spacing between adjacent main fire holes in the fire hole group is w2, and w1 is greater than w2.

3. The outer ring fire cover according to claim 2, characterized in that: The plurality of fire hole groups further include a third fire hole group and a fourth fire hole group. The circumferential spacing between adjacent fire hole groups is the same, and w1 is at least twice w2.

4. The outer ring fire cover according to claim 1, characterized in that: A plurality of upper flame-stabilizing holes are also provided at intervals on the circumferential direction of the outer side of the outer wall of the fire cover body. The plurality of upper flame-stabilizing holes located in the space of the fire hole group are separated from each other by the main fire hole, and the plurality of upper flame-stabilizing holes located in the interval range of adjacent fire hole groups are adjacent to each other, and the aperture of the upper flame-stabilizing holes is smaller than the aperture of the main fire hole.

5. The outer ring fire cover according to claim 4, characterized in that: There are at least 3 upper flame stabilizing holes located within the interval between adjacent fire hole groups.

6. The outer ring fire cover according to claim 1, characterized in that: One of the fire hole groups includes, in addition to multiple main fire holes, multiple continuously arranged secondary fire holes, the aperture of the secondary fire holes is smaller than the aperture of the main fire holes, and multiple upper flame-stabilizing holes are also provided on the circumferential outer wall of the fire cover body, the aperture of the upper flame-stabilizing holes is smaller than the aperture of the secondary fire holes, the multiple upper flame-stabilizing holes located in the space of the fire hole group are separated from each other by the main fire hole or the secondary fire hole, and the multiple upper flame-stabilizing holes located in the interval range of adjacent fire hole groups are adjacent to each other, and the aperture of the secondary fire hole is 2.0-2.5mm.

7. The outer ring fire cover according to claim 1, characterized in that: The width of the flame stabilizing groove is 0.7-1 mm; the aperture of the lower flame stabilizing hole is 1.2-1.5 mm; and the aperture of the main flame hole is 2.5-2.8 mm.

8. The outer ring fire cover according to claim 1, characterized in that: The main fire hole passes through the outer wall of the fire cover body, and a plurality of upper flame stabilization holes are arranged at intervals on the circumferential direction of the outer side of the outer wall of the fire cover body. The upper flame stabilization holes pass through the outer wall of the fire cover body, and the lower flame stabilization holes do not pass through the outer wall of the fire cover body. The plurality of lower flame stabilization holes are located below the plurality of main fire holes. The plurality of lower flame stabilization holes include a first lower flame stabilization group and a second lower flame stabilization group. The adjacent spacing between the plurality of lower flame stabilization holes in the first lower flame stabilization group is smaller, and the adjacent spacing between the plurality of lower flame stabilization holes in the second lower flame stabilization group is larger. The first lower flame stabilization group is located below the range of the fire hole group interval, and the second lower flame stabilization group is located below the fire hole group.

9. A burner, characterized in that: It comprises the outer ring fire cover, the outer ejector tube and the inner ejector tube of the ignition divider as described in any one of claims 1 to 8, the ignition divider comprises an outer ring gas channel and an inner ring gas channel, the outer ejector tube is connected to the outer ring gas channel, the inner ejector tube is connected to the inner ring gas channel, the outer ring fire cover is connected to the top of the ignition divider, the gas flow channel is formed between the outer ring fire cover and the ignition divider, and the outer ejector tube outlet is connected to the gas flow channel.

10. The burner according to claim 9, characterized in that The outer ring fire cover is provided with a plurality of 4-9 auxiliary fire holes at the outlet of the outer ejection tube, and the aperture of the auxiliary fire holes is smaller than the aperture of the main fire hole.

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