Outer ring burner and burner containing it

Abstract

This invention provides an outer ring flame cap and a burner containing it. The outer ring flame cap has a flame transfer structure with a flame transfer channel extending radially through the outer ring flame cap. The flame transfer channel is circumferentially closed. The flame transfer structure also has multiple flame transfer holes extending obliquely upward from the lower surface of the outer ring flame cap to connect with the flame transfer channel. The multiple flame transfer holes include an ignition hole, a transition hole, and an outer transfer hole arranged sequentially from the radially inner side to the radially outer side of the outer ring flame cap. The ignition hole and the transition hole are both inclined towards the radially inner side of the outer ring flame cap from bottom to top, and the angle between the axial direction and the horizontal direction of the ignition hole is smaller than the angle between the axial direction and the horizontal direction of the transition hole. The outer transfer hole is inclined towards the radially outer side of the outer ring flame cap from bottom to top. Through the flame transfer holes with different inclination directions and angles, the ignition hole can guide the flame into the flame transfer channel, the transition hole connects them, and the outer transfer hole transmits the flame out of the flame transfer channel, achieving stable flame transfer.

Description

Technical Field

[0001] This utility model relates to the field of gas stoves, and in particular to an outer ring burner cap and a burner containing therefrom. Background Technology

[0002] The current common technology for flame transmission in gas stoves involves setting up flame transmission channels on the outer ring burner to transfer the flame from the inner side to the outer side. However, this method has several problems. First, the flame transmission efficiency is low; the flame transmission process is extremely difficult in many stoves, with the time spent transferring the flame from the inner ring to the outer ring accounting for more than 50% of the entire ignition process. The outer ring releasing gas for an extended period without ignition not only prolongs the ignition time but also easily wastes gas. More seriously, this phenomenon poses a safety hazard. The prolonged release of gas without ignition by the outer ring leads to gas accumulation in the air, which, if it encounters an open flame or other ignition source, can easily cause an explosion or fire.

[0003] Furthermore, the structural design of the flame transmission channel also has flaws. Gas easily diffuses from the channel into the air, resulting in low gas concentration and unstable flame transmission. Simultaneously, the arrangement of the burner holes within the channel is unreasonable, causing airflow interference and increasing resistance to flame transmission. Moreover, the connection design between the inner and outer burner rings is flawed, preventing the gas in the channel from being properly ignited by the inner ring flame. These problems collectively affect the reliability and safety of the stove's flame transmission. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the defect of unstable fire transmission process in the fire transmission channel in the prior art, and to provide an outer ring fire cover and a burner containing it.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution:

[0006] An outer ring flame cap is provided with a flame transmission structure. The flame transmission structure has a flame transmission channel that penetrates the outer ring flame cap radially. The flame transmission channel is closed circumferentially. The flame transmission structure also has a plurality of flame transmission holes that extend obliquely upward from the lower surface of the outer ring flame cap to communicate with the flame transmission channel. The plurality of flame transmission holes include a plurality of ignition holes, a plurality of transition holes, and a plurality of external transmission holes arranged sequentially from the radially inner side to the radially outer side of the outer ring flame cap. The ignition holes and the transition holes are all inclined towards the radially inner side of the outer ring flame cap from bottom to top, and the angle between the axial direction of the ignition hole and the horizontal direction is smaller than the angle between the axial direction of the transition hole and the horizontal direction. The external transmission holes are inclined towards the radially outer side of the outer ring flame cap from bottom to top.

[0007] In this technical solution, by setting an ignition hole, a transition hole, and an outer transmission hole in the flame transmission channel, the ignition hole and the transition hole are both inclined radially inward from bottom to top towards the outer ring flame cap, and the angle between the axial direction and the horizontal direction of the ignition hole is smaller than the angle between the axial direction and the horizontal direction of the transition hole. This allows the ignition hole to guide the flame from the inner ring flame cap into the flame transmission channel, where it is connected by the transition hole. The outer transmission hole, inclined radially outward from bottom to top towards the outer ring flame cap, can transmit the flame out of the flame transmission channel, achieving stable flame transmission. Furthermore, by setting the flame transmission channel to be circumferentially closed, the gas can only flow from the radially inner inlet to the radially outer outlet of the flame transmission channel, preventing gas diffusion, maintaining a stable gas concentration, and promoting combustion.

[0008] Preferably, the plane containing the axis of the fire transmission channel and the axis of the outer ring fire cover is a first plane, some of the fire transmission holes are passed through the first plane, and the remaining fire transmission holes are arranged on one side of the first plane along the circumference of the outer ring fire cover.

[0009] In this technical solution, due to the ejector effect of the inner ring burner, air flows from the radially outer side of the outer ring burner through the ignition channel to the radially inner side of the outer ring burner. The ignition direction of the ignition channel is opposite to the aforementioned airflow direction. Therefore, by setting some of the ignition holes to be passed through the first plane containing the axis of the ignition channel and the axis of the outer ring burner, and setting the remaining ignition holes on one side of the first plane along the circumference of the outer ring burner, that is, not setting ignition holes on the other side of the first plane along the circumference of the outer ring burner, leaving it as an airflow area, the ignition area and airflow area of ​​the ignition channel are relatively independent, which enables more complete combustion and smoother ignition.

[0010] Preferably, the plurality of ignition holes form a plurality of ignition hole groups, each ignition hole group including a plurality of ignition holes spaced apart along the axial direction of the ignition channel, and the plurality of ignition holes in a single ignition hole group including at least two of the ignition hole, the transition hole and the outer ignition hole, and the plurality of ignition hole groups are spaced apart along the circumferential direction of the ignition channel.

[0011] In this technical solution, by grouping the flame transmission holes, the flame is transmitted systematically and the propagation process is more stable. Since the ignition hole is the first step in introducing the flame into the flame transmission channel, ignition holes are included in each group of flame transmission holes to better ensure the smooth progress of the flame transmission process. Furthermore, each group includes at least two types of flame transmission holes, which allows for better connection in the radial direction of the outer ring flame cap, ensuring the flame is transmitted smoothly outwards.

[0012] Preferably, each group of ignition holes includes the ignition hole, and the diameter of the ignition hole that is passed through the first plane is larger than the diameter of the ignition hole located on one side of the first plane along the circumference of the outer ring fire cap.

[0013] In this technical solution, the first plane is located at the middle position of the fire transmission channel along the circumference of the outer ring flame cap. By having the diameter of the ignition hole that the first plane passes through larger than the diameter of the fire transmission hole located on one side of the first plane along the circumference of the outer ring flame cap, that is, the diameter of the fire transmission hole at the middle position of the fire transmission channel along the circumference of the outer ring flame cap is larger than the diameter of the fire transmission hole on the side. The middle position serves as the main fire transmission area, and the side serves as a supplementary fire transmission area, resulting in a better fire transmission effect.

[0014] Preferably, the number of ignition hole groups is three, including a first ignition hole group, a second ignition hole group, and a third ignition hole group. The first plane passes through the first ignition hole group, and the second and third ignition hole groups are disposed on one side of the first plane along the circumference of the outer ring fire cover. The first ignition hole group includes one ignition hole and one transition hole, and the second and third ignition hole groups each include one ignition hole and one external transmission hole.

[0015] In this technical solution, three sets of flame transmission holes are set. The first set of flame transmission holes is located in the middle of the flame transmission channel along the circumference of the outer ring fire cover. It is the main flame transmission area. Ignition holes and transition holes are set to ensure smooth connection of flames in the main flame transmission area. Ignition holes and external transmission holes are set in the supplementary flame transmission area on the side so that the flames can be transmitted more powerfully.

[0016] Preferably, along the radial direction of the outer ring flame cap, the flame transmission channel includes multiple segments, each segment having at least one flame transmission hole, and the radial length of each segment being between 1 / 5 and 1 / 4 of the radial length of the flame transmission channel.

[0017] In this technical solution, by setting the fire transmission channel into multiple segments, and each segment having at least one fire transmission hole, the fire transmission holes are more evenly distributed in the radial direction, thus avoiding excessive spacing between the fire transmission holes in the radial direction, which could lead to fire transmission failure.

[0018] Preferably, the angle between the axis of the ignition hole and the horizontal direction is α, where 20°≤α≤45°.

[0019] In this technical solution, by setting the angle α between the axis of the ignition hole and the horizontal direction to between 20° and 45°, the flame can be introduced into the ignition channel more efficiently.

[0020] Preferably, the angle between the axis of the transition hole and the horizontal direction is b, where 50°≤b≤85°.

[0021] In this technical solution, by setting the angle b between the axis of the transition hole and the horizontal direction to between 50° and 85°, the connection of the flame in the ignition channel can be achieved more efficiently.

[0022] Preferably, the angle between the axis of the transition hole and the horizontal direction is c, where 30°≤c≤80°.

[0023] In this technical solution, by setting the angle c between the axis of the external transmission hole and the horizontal direction to between 30° and 80°, the flame can be transmitted out of the fire transmission channel more efficiently.

[0024] Preferably, the number of ignition holes is not less than two.

[0025] In this technical solution, the ignition hole is used to introduce the flame into the ignition channel, which is the first step in ignition. Therefore, setting at least two ignition holes can improve the reliability of ignition.

[0026] Preferably, the number of external transmission holes is not less than two.

[0027] In this technical solution, the function of the external transmission hole is to transmit the flame out of the flame transmission channel. Setting at least two external transmission holes can make the flame transmit more efficiently.

[0028] Preferably, the outer ring flame cover further includes a windproof baffle, which is disposed at one end of the flame transmission channel near the radially inner side of the outer ring flame cover and located below the flame transmission channel.

[0029] In this technical solution, by setting up a windproof baffle, secondary air can be blocked, avoiding interference from secondary air with the fire transmission, thereby creating a more stable airflow environment for the fire transmission channel, which is conducive to fire transmission.

[0030] A burner comprising an inner ring burner cap and an outer ring burner cap as described above, the inner ring burner cap being disposed inside the outer ring burner cap along the radial direction.

[0031] The positive and progressive effects of this invention are as follows: By setting an ignition hole, a transition hole, and an outer transmission hole in the flame transmission channel, wherein the ignition hole and the transition hole are both inclined radially inward from bottom to top towards the outer ring flame cap, and the angle between the axial direction and the horizontal direction of the ignition hole is smaller than the angle between the axial direction and the horizontal direction of the transition hole, the ignition hole can guide the flame from the inner ring flame cap into the flame transmission channel, and the transition hole connects them in the flame transmission channel. The outer transmission hole is inclined radially outward from bottom to top towards the outer ring flame cap, thus transmitting the flame out of the flame transmission channel, achieving stable flame transmission. Furthermore, by setting the flame transmission channel to be circumferentially closed, the gas can only flow from the radially inner inlet to the radially outer outlet of the flame transmission channel, preventing gas diffusion, maintaining a stable gas concentration, and promoting combustion. Attached Figure Description

[0032] Figure 1 This is a three-dimensional structural diagram of a burner according to an embodiment of the present invention.

[0033] Figure 2 This is a three-dimensional structural diagram of the outer ring flame cap according to an embodiment of the present invention.

[0034] Figure 3 This is a bottom view of the outer ring flame cap according to an embodiment of the present invention.

[0035] Figure 4 This is a cross-sectional structural diagram (I) of the outer ring fire cap according to an embodiment of the present invention.

[0036] Figure 5 This is a cross-sectional structural diagram (II) of the outer ring fire cap according to an embodiment of the present invention.

[0037] Figure 6 This is a cross-sectional structural diagram (III) of the outer ring fire cap according to an embodiment of the present invention.

[0038] Explanation of reference numerals in the attached figures:

[0039] Burner 100

[0040] Outer ring fire cap 1

[0041] Flame transfer structure 11

[0042] Fire transmission channel 101

[0043] Fire transfer hole 102

[0044] Ignition hole 1021

[0045] Transition hole 1022

[0046] External transmission hole 1023

[0047] First ignition hole group 110

[0048] Second ignition port group 120

[0049] Third ignition hole group 130

[0050] Inner ring fire cap 2

[0051] Ignition needle 3

[0052] Windshield 4 Detailed Implementation

[0053] The present invention will be described more clearly and completely below with reference to the accompanying drawings, using a preferred embodiment.

[0054] like Figure 1-6 As shown, this embodiment provides a burner 100, including an inner ring burner cap 2 and an outer ring burner cap 1. When the burner 100 is ignited, the ignition needle 3 first ignites the gas at the inner ring burner cap 2 to generate a flame. The outer ring burner cap 1 is provided with a flame transfer structure 11, through which the flame is transferred to the outer ring burner cap 1. Wherein, as... Figures 2-6As shown, the ignition structure 11 has a ignition channel 101 that penetrates the outer ring flame cap 1 radially. The ignition channel 101 is closed circumferentially. The ignition structure 11 also has a plurality of ignition holes 102 that extend obliquely upward from the lower surface of the outer ring flame cap 1 to connect with the ignition channel 101. The plurality of ignition holes 102 include an ignition hole 1021, a transition hole 1022, and an outer transmission hole 1023 arranged sequentially from the radial inner side to the radial outer side of the outer ring flame cap 1. The ignition hole 1021 and the transition hole 1022 are both inclined toward the radial inner side of the outer ring flame cap 1 from bottom to top, and the angle between the axial direction of the ignition hole 1021 and the horizontal direction is smaller than the angle between the axial direction of the transition hole 1022 and the horizontal direction. The outer transmission hole 1023 is inclined toward the radial outer side of the outer ring flame cap 1 from bottom to top. By providing an ignition hole 1021, a transition hole 1022, and an outer transmission hole 1023 at the fire transmission channel 101, where the ignition hole 1021 and the transition hole 1022 are both inclined radially inward from bottom to top towards the outer ring flame cap 1, and the angle between the axial direction and the horizontal direction of the ignition hole 1021 is smaller than the angle between the axial direction and the horizontal direction of the transition hole 1022, the ignition hole 1021 can guide the flame from the inner ring flame cap 2 into the fire transmission channel 101, and the transition hole 1022 connects it in the fire transmission channel 101. The outer transmission hole 1023, inclined radially outward from bottom to top towards the outer ring flame cap 1, can transmit the flame out of the fire transmission channel 101, achieving stable fire transmission. It should be noted that the fire transmission channel 101 being circumferentially closed does not mean that the fire transmission channel 101 is completely isolated from the outside, but rather that the circumferential direction of the fire transmission channel 101 is only connected to the outside through the ignition hole 102. By setting the ignition channel 101 to be circumferentially closed, the gas can only flow from the inlet on the radially inner side of the ignition channel 101 to the outlet on the radially outer side, thus preventing gas diffusion, maintaining a stable gas concentration, and facilitating combustion.

[0055] Specifically, the plane containing the axis of the ignition channel 101 and the axis of the outer ring flame cap 1 is a first plane (not shown in the figure). Part of the ignition holes 102 are passed through the first plane, and the remaining ignition holes 102 are located on one side of the first plane along the circumference of the outer ring flame cap 1. Due to the ejector effect of the inner ring flame cap 2, air flows from the radially outer side of the outer ring flame cap 1 through the ignition channel 101 to the radially inner side of the outer ring flame cap 1. The ignition direction of the ignition channel 101 is opposite to the aforementioned airflow direction. Therefore, by setting part of the ignition holes 102 to be passed through the first plane containing the axis of the ignition channel 101 and the axis of the outer ring flame cap 1, and setting the remaining ignition holes 102 on one side of the first plane along the circumference of the outer ring flame cap 1, that is, not setting ignition holes 102 on the other side of the first plane along the circumference of the outer ring flame cap 1, leaving it as an airflow area, the ignition area and the airflow area of ​​the ignition channel 101 are relatively independent, which can make combustion more complete and ignition smoother.

[0056] Of course, in other embodiments, the fire transmission hole 102 can be arranged in other ways, such as at the position through which the first plane passes and on both sides of the first plane. This can also distinguish the fire transmission area and the air circulation area of ​​the fire transmission channel 101, making the fire transmission smoother. This will not be elaborated further here.

[0057] In this embodiment, as Figure 3 and Figure 4 As shown, multiple flame-transfer holes 102 form multiple groups of flame-transfer holes 102. Each group of flame-transfer holes 102 includes multiple flame-transfer holes 102 spaced apart axially along the flame-transfer channel 101. Each group of flame-transfer holes 102 includes at least two of the following: ignition holes 1021, transition holes 1022, and external transmission holes 1023. Multiple groups of flame-transfer holes 102 are spaced apart circumferentially along the flame-transfer channel 101. By grouping the flame-transfer holes 102, the flame is transmitted systematically, resulting in a more stable propagation process. Since the ignition hole 1021 introduces the flame into the flame-transfer channel 101, which is the first step in flame transmission, ignition holes 1021 are provided in each group of flame-transfer holes 102 to better ensure the smooth progress of the flame transmission process. Furthermore, since each group includes at least two types of flame-transfer holes 102, better connection can be achieved in the radial direction of the outer ring flame cap 1, allowing the flame to be transmitted smoothly outwards.

[0058] Each group of ignition holes 102 includes an ignition hole 1021. The diameter of the ignition hole 1021 passed through by the first plane is larger than the diameter of the ignition hole 102 located on one side of the first plane along the circumference of the outer ring flame cap 1. The first plane is located at the middle position of the ignition channel 101 along the circumference of the outer ring flame cap 1. By making the diameter of the ignition hole 1021 passed through by the first plane larger than the diameter of the ignition hole 102 located on one side of the first plane along the circumference of the outer ring flame cap 1, that is, the diameter of the ignition hole 102 at the middle position of the ignition channel 101 along the circumference of the outer ring flame cap 1 is larger than the diameter of the ignition hole 102 on the side. The middle position serves as the main ignition area, and the side positions serve as supplementary ignition areas, resulting in better ignition effect.

[0059] The preferred number of ignition holes 1021 is no less than two. The function of the ignition holes 1021 is to introduce the flame into the ignition channel 101, which is the first step in ignition. Therefore, providing at least two ignition holes 1021 can improve the reliability of ignition. Similarly, the preferred number of external transmission holes 1023 is also no less than two. The function of the external transmission holes 1023 is to transmit the flame out of the ignition channel 101. Providing at least two external transmission holes 1023 can make the flame transmission more efficient.

[0060] Specifically in this embodiment, such as Figures 2-6As shown, there are six ignition holes 102, including three ignition holes 1021, one transition hole 1022, and two external transmission holes 1023. These six ignition holes 102 form three groups of ignition holes 102. Specifically, as shown... Figure 3 and Figure 4 As shown, the three sets of ignition holes 102 include a first ignition hole group 110, a second ignition hole group 120, and a third ignition hole group 130. A first plane passes through the first ignition hole group 110. The second ignition hole group 120 and the third ignition hole group 130 are located on one side of the first plane along the circumference of the outer ring fire cover 1. The first ignition hole group 110 includes an ignition hole 1021 and a transition hole 1022. The second ignition hole group 120 and the third ignition hole group 102 each include an ignition hole 1021 and an external transmission hole 1023. Three sets of flame transmission holes 102 are provided. The first set of flame transmission holes 110 is located in the middle of the flame transmission channel 101 along the outer ring fire cover 1, which is the main flame transmission area. Ignition holes 1021 and transition holes 1022 are provided to ensure smooth connection of the flame in the main flame transmission area. The supplementary flame transmission area on the side is provided with ignition holes 1021 and external transmission holes 1023 to make the flame transmit more powerfully.

[0061] The spacing between adjacent groups of ignition holes 102 is set at about 2 mm, which can be determined according to the diameter of the ignition hole 102. The spacing between groups of ignition holes 102 is set to about 1.5 times the diameter of the ignition hole 102.

[0062] Specifically, in this embodiment, the diameter of the ignition hole 1021 in the first ignition hole group 110 is 1.6 mm, the diameter of the transition hole 1022 in the first ignition hole group 110 is 1.3 mm, the diameter of the ignition hole 1021 in the second ignition hole group 120 and the third ignition hole group 130 is 1.2 mm, the diameter of the ignition outlet hole in the second ignition hole group 120 is 1.2 mm, and the diameter of the ignition hole 1021 in the third ignition hole group 130 is 1.5 mm. The spacing between adjacent ignition hole groups 102 is 2 mm.

[0063] Of course, in other embodiments, the grouping of the ignition holes 102 can also be optimized according to the number of different types of ignition holes 102. When the number of ignition holes 102 is large, each group can also contain three types of ignition holes 102 at the same time, which will not be elaborated here.

[0064] Meanwhile, along the radial direction of the outer ring flame cap 1, the flame transmission channel 101 includes multiple segments, each segment having at least one flame transmission hole 102, and the radial length of each segment being between 1 / 5 and 1 / 4 of the radial length of the flame transmission channel 101. By setting the flame transmission channel 101 into multiple segments, each segment having at least one flame transmission hole 102, the flame transmission holes 102 are more evenly distributed radially, avoiding excessively large spacing between the flame transmission holes 102 that could lead to flame transmission failure.

[0065] Specifically, in this embodiment, the radial length of each segment is 1 / 4 of the length of the ignition channel 101. The ignition channel 101 includes a first segment, a second segment, a third segment, and a fourth segment distributed sequentially from the radially inner side to the radially outer side of the outer ring flame cap 1. The ignition hole 1021 is disposed in the first segment and the second segment, the transition hole 1022 is disposed in the third segment, and the outer transmission hole 1023 is disposed in the fourth segment.

[0066] Of course, in other embodiments, the fire transmission holes 102 can be arranged more densely to improve the fire transmission efficiency. For example, the length of each segment can be set to 1 / 5 of the fire transmission channel 101, which will not be elaborated here.

[0067] The preferred angles for different ignition holes 102 are as follows: The angle between the axis of the ignition hole 1021 and the horizontal direction is 'a', and the preferred value range of 'a' is 20° ≤ a ≤ 45°. By setting the angle 'a' between the axis of the ignition hole 1021 and the horizontal direction to be between 20° and 45°, the flame can be introduced into the ignition channel 101 more efficiently. The angle between the axis of the transition hole 1022 and the horizontal direction is 'b', and the preferred value range of 'b' is 50° ≤ b ≤ 85°. By setting the angle 'b' between the axis of the transition hole 1022 and the horizontal direction to be between 50° and 85°, the connection of the flame in the ignition channel 101 can be achieved more efficiently. The angle between the axis of the transition hole 1022 and the horizontal direction is 'c', and the preferred value range of 'c' is 30° ≤ c ≤ 80°. By setting the angle c between the axis of the external transmission hole 1023 and the horizontal direction to between 30° and 80°, the flame can be transmitted out of the flame transmission channel 101 more efficiently.

[0068] Specifically, in this embodiment, the angle α between the axis of the ignition hole 1021 in the first ignition hole group 110 and the horizontal direction is 40°, the angle b between the axis of the transition hole 1022 in the first ignition hole group 110 and the horizontal direction is 50°, the angle α between the axis of the ignition hole 1021 in the second ignition hole group 120 and the third ignition hole group 130 and the horizontal direction is 22.5°, the angle c between the axis of the ignition hole in the second ignition hole group 120 and the horizontal direction is 32°, and the angle c between the axis of the ignition hole 1021 in the third ignition hole group 130 and the horizontal direction is 72.5°. Specifically, setting the angle between the axis of the ignition hole 1021 in the first ignition hole group 110 and the horizontal direction to be different from the angle between the axis of the ignition hole 1021 in the second ignition hole group 120 and the horizontal direction to be different from the angle between the axis of the ignition hole 1021 in the third ignition hole group 130 and the horizontal direction can also play a better connecting role and make the ignition transmission smoother. At the same time, setting the angle between the axis of the external transmission hole 1023 in the second ignition hole group 120 and the horizontal direction to be different from the angle between the axis of the external transmission hole 1023 in the third ignition hole group 130 and the horizontal direction can also make the ignition transmission smoother.

[0069] In this embodiment, the outer ring burner cap 1 also includes a windproof baffle 4, which is disposed at one end of the flame transmission channel 101 near the radially inner side of the outer ring burner cap 1 and located below the flame transmission channel 101. Under the ejector effect of the inner ring burner cap 2, secondary air flows upward through the secondary air channel of the burner 100. By setting the windproof baffle 4 at one end of the radially inner side of the flame transmission channel, the secondary air can be blocked, preventing it from impacting the flame transmission channel 101, thereby creating a more stable airflow environment for the flame transmission channel 101, which is beneficial for flame transmission.

[0070] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. An outer ring fire cover characterized in that, The outer ring flame cap is provided with a flame transmission structure, which has a flame transmission channel that penetrates the outer ring flame cap radially. The flame transmission channel is closed circumferentially. The flame transmission structure also has a plurality of flame transmission holes that extend obliquely upward from the lower surface of the outer ring flame cap to connect with the flame transmission channel. The plurality of flame transmission holes include a plurality of ignition holes, a plurality of transition holes, and a plurality of external transmission holes arranged sequentially from the radially inner side to the radially outer side of the outer ring flame cap. The ignition holes and the transition holes are both inclined toward the radially inner side of the outer ring flame cap from bottom to top, and the angle between the axial direction of the ignition hole and the horizontal direction is smaller than the angle between the axial direction of the transition hole and the horizontal direction. The external transmission holes are inclined toward the radially outer side of the outer ring flame cap from bottom to top.

2. The outer ring flame cap of claim 1 wherein, The plane containing the axis of the fire transmission channel and the axis of the outer ring fire cover is a first plane. Some of the fire transmission holes are passed through the first plane, and the remaining fire transmission holes are located on one side of the first plane along the circumference of the outer ring fire cover.

3. The outer ring flame cap of claim 2 wherein, Multiple fire-transmitting holes form multiple fire-transmitting hole groups. Each fire-transmitting hole group includes multiple fire-transmitting holes spaced apart along the axial direction of the fire-transmitting channel. The multiple fire-transmitting holes in a single fire-transmitting hole group include at least two of the following: the ignition hole, the transition hole, and the outer transmission hole. The multiple fire-transmitting hole groups are spaced apart circumferentially along the fire-transmitting channel.

4. The outer ring flame cap of claim 3 wherein, Each group of the ignition holes includes the ignition hole, and the diameter of the ignition hole that is passed through the first plane is larger than the diameter of the ignition hole located on one side of the first plane along the circumference of the outer ring fire cap.

5. The outer ring flame cap of claim 4 wherein, The number of ignition hole groups is three, including a first ignition hole group, a second ignition hole group, and a third ignition hole group. The first plane passes through the first ignition hole group. The second and third ignition hole groups are arranged on one side of the first plane along the circumference of the outer ring fire cover. The first ignition hole group includes one ignition hole and one transition hole. The second and third ignition hole groups each include one ignition hole and one external transmission hole.

6. The outer ring flame cap of claim 1 wherein, Along the radial direction of the outer ring flame cap, the flame transmission channel includes multiple segments, each segment having at least one flame transmission hole, and the radial length of each segment being between 1 / 5 and 1 / 4 of the radial length of the flame transmission channel.

7. The outer ring flame cap as described in claim 1, characterized in that: The angle between the axis of the ignition hole and the horizontal direction is α, where 20°≤α≤45°; And / or, the angle between the axis of the transition hole and the horizontal direction is b, 50°≤b≤85°; And / or, the angle between the axis of the transition hole and the horizontal direction is c, where 30°≤c≤80°.

8. The outer ring flame cap of claim 1 wherein, The number of ignition holes shall be no less than two; And / or, the number of external transmission holes is not less than two.

9. The outer ring flame cap of claim 1 wherein, The outer ring flame cover also includes a windproof baffle, which is disposed at one end of the flame transmission channel near the radially inner side of the outer ring flame cover and located below the flame transmission channel.

10. A burner characterized by, The combustor includes an inner ring flame cap and an outer ring flame cap as recited in any one of claims 1-9, the inner ring flame cap disposed radially inward of the outer ring flame cap.

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