A fire cover for a burner

Abstract

The present invention discloses a fire cover for a burner, the fire cover comprising an annular fire cover body, the fire cover body being provided with a first air cavity and a second air cavity opening downwardly, the outer side wall of the fire cover body being circumferentially provided with a plurality of outer ring small fire holes and outer ring large fire holes arranged in a staggered manner or arranged side by side up and down, the outer ring large fire holes being connected to the first air cavity, and the outer ring small fire holes being connected to the second air cavity. The fire cover of the present invention, by arranging both the outer ring large fire holes and the outer ring small fire holes on the outer side wall of the fire cover body, can form at least one ring of two-stage fire when gas burns on the fire cover, and the flame length of the outer ring small fire holes remains unchanged compared to the flame length of the outer ring large fire holes, significantly improving the thermal efficiency of the outer ring small fire. At the same time, the user can intuitively judge the size of the fire power based on the position or number of the fire holes, without having to judge the length of the flame.

Description

Technical Field

[0001] The present invention relates to the technical field of stoves, in particular to a fire cover for a burner. Background Art

[0002] When gas stove manufacturers improve the thermal efficiency of their stoves, due to testing standards, they only measure the thermal efficiency of household gas stoves at maximum power, where the flames in each burner are at their longest, resulting in the highest combustion efficiency. However, Chinese people have different requirements for the amount of power they need when cooking.

[0003] To achieve a wider range of power levels, household gas stoves on the market offer a range of power levels. Besides maximum and extinguished, each flame hole also has an intermediate low-power setting. This low-power setting is achieved by reducing the gas supply, but the flame in this intermediate setting is suboptimal. The gas supply is low, the draft is poor, the flame is short, and it's farther from the pot bottom, resulting in lower combustion efficiency than the high-power setting. Furthermore, most atmospheric stoves on the market feature two rings, each with a separate flame cap for the outer and inner rings, resulting in a complex structure. Summary of the Invention

[0004] The present invention aims to solve at least one of the problems existing in the existing related technologies to a certain extent. To this end, the present invention proposes a fire cover for a burner, which has a simple structure and is provided with an outer ring large fire hole and an outer ring small fire hole on the outer side wall of the fire cover. The flame length of the outer ring small fire hole is unchanged compared with the flame length of the outer ring large fire hole, so that the distribution range of the outer ring small fire is larger and the thermal efficiency is high, which significantly improves the thermal efficiency of the outer ring small fire and is convenient for users to intuitively judge the size of the firepower.

[0005] According to the above-mentioned fire cover for a burner, it is achieved through the following technical solutions:

[0006] A fire cover for a burner, comprising an annular fire cover body, the fire cover body being provided with a first air cavity and a second air cavity opening downwardly, the outer side wall of the fire cover body being circumferentially provided with a plurality of outer ring small fire holes and outer ring large fire holes arranged alternately or side by side up and down, the outer ring large fire holes being connected to the first air cavity, and the outer ring small fire holes being connected to the second air cavity.

[0007] In some embodiments, the first air cavity is located outside the second air cavity, and a plurality of first partitions are circumferentially spaced apart in the first air cavity. The first partitions divide the first air cavity into a plurality of outer air cavities. The outer side walls of the outer air cavities are provided with the outer ring large fire holes, and the outer ring small fire holes sequentially penetrate the outer ring wall of the second air cavity, the first partitions, and the outer ring wall of the first air cavity.

[0008] In some embodiments, a first gap H is left between the bottom of the first partition and the bottom opening of the first air cavity, and the adjacent outer air cavities are connected through the first gap H. In some embodiments, the top surface of the first partition abuts or is fixedly connected to the top of the first air cavity, and opposite ends of the first partition in the radial direction are integrally formed with opposite side walls of the first air cavity.

[0009] In some embodiments, the outer ring small fire holes and the outer ring large fire holes are staggered in the circumferential direction, and the center line of the outer ring small fire hole outlet and the center line of the outer ring large fire hole outlet are located on the same plane; or, the outer ring small fire holes and the outer ring large fire holes are arranged side by side in the vertical direction, and the outer ring small fire holes and the outer ring large fire holes are staggered in the vertical direction.

[0010] In some embodiments, the outer ring large fire holes are composed of one first fire hole or a plurality of first fire holes arranged at intervals, and the outer ring small fire holes are composed of one second fire hole or a plurality of second fire holes arranged at intervals.

[0011] In some embodiments, the fire cover body is further provided with a third air cavity opening downward, and a plurality of inner ring small fire holes are circumferentially provided on the inner side wall of the fire cover body, and the inner ring small fire holes are connected to the third air cavity.

[0012] In some embodiments, the fire cover body is further provided with a fourth air cavity opening downward, and the fourth air cavity is located between the second air cavity and the third air cavity. A number of extremely small fire holes connected to the fourth air cavity are provided circumferentially on the inner side wall of the fire cover body, and the extremely small fire holes and the inner ring small fire holes are staggered in the circumferential direction, or the extremely small fire holes and the inner ring small fire holes are arranged side by side in the vertical direction.

[0013] In some embodiments, the fourth air cavity is located outside the third air cavity, and a plurality of second partitions are circumferentially spaced apart in the third air cavity. The second partitions divide the third air cavity into a plurality of inner air cavities. The inner side walls of the inner air cavities are provided with the inner ring small fire holes. The extremely small fire holes sequentially penetrate the inner ring wall of the fourth air cavity, the second partitions and the inner ring wall of the third air cavity.

[0014] In some embodiments, a second gap S is left between the bottom of the second partition and the bottom opening of the third air cavity, and the adjacent inner air cavities are connected through the second gap S.

[0015] In some embodiments, the top surface of the second partition abuts against or is fixedly connected to the top of the third air cavity, and opposite ends of the second partition in the radial direction are integrally formed with opposite side walls of the third air cavity.

[0016] In some embodiments, the inner ring small fire hole is composed of one third fire hole or a plurality of third fire holes arranged at intervals, and the extremely small fire hole is composed of one fourth fire hole or a plurality of fourth fire holes arranged at intervals.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects:

[0018] 1. The fire cover of the present invention has a simple structure. By providing an outer ring of large fire holes and an outer ring of small fire holes on the outer side wall of the fire cover body, and the outer ring of large fire holes and the outer ring of small fire holes are respectively connected to different ejection pipes, when the gas burns on the fire cover, it can form at least one ring and two stages of fire power. The flame length of the outer ring of small fire holes remains unchanged compared to the flame length of the outer ring of large fire holes, so that the ejection and combustion are always in the optimal state, the outer ring of small fire is distributed over a wider range, and the thermal efficiency of the outer ring of small fire is significantly improved.

[0019] 2. Users can intuitively judge the size of the firepower based on the position or number of fire holes instead of the length of the flame. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 This is a schematic structural diagram of the fire cover in Example 1 of the present invention;

[0022] Figure 2 This is a schematic diagram of the exploded structure of the burner in Example 1 of the present invention;

[0023] Figure 3 is a cross-sectional view of a burner in Example 1 of the present invention;

[0024] Figure 4 Schematic diagram of the structure of the burner in Example 2 of the present invention;

[0025] Figure 5 This is a schematic structural diagram of the fire cover in Example 3 of the present invention;

[0026] Figure 6 is a cross-sectional view of a fire cover in Example 3 of the present invention;

[0027] Figure 7 Schematic diagram of the structure of the burner in Example 3 of the present invention;

[0028] Figure 81 is a schematic diagram of the exploded structure of the burner in Example 3 of the present invention;

[0029] Figure 9 It is a structural schematic diagram of the burner in Example 4 of the present invention. DETAILED DESCRIPTION

[0030] The following examples illustrate the present invention, but the present invention is not limited to these examples. Modifications to the specific embodiments of the present invention or equivalent replacements of some technical features without departing from the spirit of the present invention should be included in the scope of the technical solution claimed in the present invention.

[0031] Example 1

[0032] See also Figure 1-3 The present embodiment provides a fire cover for a burner, which includes a ring-shaped fire cover body 1. The fire cover body 1 is provided with a first air cavity (not shown in the figure) opening downward and a second air cavity 12 opening downward. The outer wall of the fire cover body 1 is circumferentially provided with a plurality of outer ring small fire holes 21 and outer ring large fire holes 22 arranged alternately or side by side. The outer ring large fire holes 22 are connected to the first air cavity, and the outer ring small fire holes 21 are connected to the second air cavity 12. In this way, by arranging the outer ring small fire holes 21 and the outer ring large fire holes 22 on the outer wall of the same fire cover, the fire cover as a whole only has an outer ring fire, wherein the outer ring fire includes an outer ring large fire and an outer ring small fire.

[0033] When the gas burns in the outer ring large fire hole 22, an outer ring large fire is formed; when the gas burns in the outer ring small fire hole 21, an outer ring small fire is formed. In this embodiment, the first air cavity and the second air cavity 12 are connected to different ejector tubes respectively. Figure 2-3 The fire cover is connected to the top of the burner 5 so that the first air cavity is connected to the first ejector tube 51 through the first external mixing cavity 501 of the burner, and the second air cavity 12 is connected to the second ejector tube 52 through the second external mixing cavity 502 of the burner, so that the flame length and firepower of each fire hole will not change, either on or off, to ensure that each fire hole has only two states of maximum and optimal flame burning and extinction, and the flame length of the outer ring small fire hole 21 in the burning state is unchanged compared with the flame length of the outer ring large fire hole 22, the ejection and combustion are always in the best state, so that the flame combustion of the outer ring when the fire is small is always in the best combustion state.

[0034] It can be seen that the fire cover of this embodiment has a simple structure. By setting an outer ring of large fire holes 22 and an outer ring of small fire holes 21 on the outer side wall of the fire cover body 1, and the outer ring of large fire holes 22 and the outer ring of small fire holes 21 are respectively connected to different injection pipes, so that when the gas burns on the fire cover, at least one ring and two stages of fire power can be formed, and the flame length of the outer ring of small fire holes 21 is unchanged compared to the flame length of the outer ring of large fire holes 32, so that the injection and combustion are always in the best state, the distribution range of the outer ring of small fire is larger, and it will not be too concentrated on the bottom of the pot, which significantly improves the thermal efficiency of the outer ring of small fire, ensures that the bottom of the pot is heated more evenly, and has a good cooking experience. In addition, users do not need to judge the size of the fire power based on the length of the flame, but only need to judge based on the position or number of fire holes.

[0035] Preferably, the outer ring large fire hole 22 is composed of a first fire hole 221 or a plurality of first fire holes 221 arranged at intervals, and the outer ring small fire hole 21 is composed of a second fire hole 211 or a plurality of second fire holes 211 arranged at intervals. Figure 1 , this embodiment takes the outer ring large fire hole 22 consisting of a first fire hole 221 and the outer ring small fire hole 21 consisting of a second fire hole 211 as an example. The outer ring large fire hole 22 (i.e., the first fire hole 221) and the outer ring small fire hole 21 (i.e., the second fire hole 211) are staggered along the circumferential direction on the outer side wall of the fire cover body 1, and the center line of the outlet of the outer ring large fire hole 22 and the center line of the outlet of the outer ring small fire hole 21 are located on the same plane. Therefore, by designing the outer ring large fire hole 22 and the outer ring small fire hole 21 to be staggered, it is effectively ensured that the thermal efficiency is high when the outer ring is on a small fire, and the bottom of the pot is heated more evenly. In addition, the size of the firepower is very intuitive. The user can judge the size of the firepower by the number of burning fire holes rather than the length of the flame, which provides the user with a better cooking experience.

[0036] See also Figure 1-2 Specifically, the first air cavity and the second air cavity 12 are both annular structures. The first air cavity is located outside the second air cavity 12, and the first air cavity and the second air cavity 12 share a side wall, that is, the inner ring wall of the first air cavity constitutes the outer ring wall of the second air cavity 12. A plurality of first partitions 41 are arranged at circumferential intervals within the first air cavity. The first partitions 41 divide the first air cavity into a plurality of outer sub-cavities 11. The outer side walls of the outer sub-cavities 11 are provided with outer ring large fire holes 22 connected to the outer sub-cavities 11, that is, at least one first fire hole 221 connected to the outer sub-cavity 11 can be provided on the outer side walls of the outer sub-cavities 11. The outer ring small fire holes 21 pass through the outer ring wall of the second air cavity 12, the first partitions 41, and the outer ring wall of the first air cavity in sequence from the inside to the outside. Therefore, through the first partition 41, the second fire hole 211 can pass through the first air cavity and connect to the second air cavity 12, while ensuring that the outer ring large fire holes 22 and the outer ring small fire holes 21 are staggered in the circumferential direction, effectively ensuring the uniformity of heating of the pot bottom when the outer ring is on low fire.

[0037] Preferably, all the first partitions 41 are evenly spaced along the circumferential direction of the first air cavity, so that the outlets of the outer ring small fire holes 21 are evenly spaced on the outer wall of the fire cover body 1, ensuring that the thermal efficiency of the outer ring small fire is high and the outer ring small fire is heated more evenly and will not be too concentrated on the bottom of the pot.

[0038] Specifically, a first gap H is left between the bottom of the first partition 41 and the bottom opening of the first air cavity. In this embodiment, the first gap H specifically refers to the height difference between the bottom of the first partition 41 and the lower end surface of the inner ring wall of the first air cavity. Adjacent outer air cavities 11 are connected by the first gap H, which helps improve gas distribution uniformity and ensures combustion uniformity and stability in each outer ring large fire hole 22.

[0039] Preferably, the top surface of the first partition 41 abuts or is fixedly connected to the top of the first air cavity, and the opposite ends of the first partition 41 in the radial direction are respectively integrally formed with the opposite side walls of the first air cavity. In this way, while ensuring that the first partition 41 is firmly and reliably connected, it is also convenient for the first partition 41 to be quickly processed and formed, saving the connection process of the first partition 41 and reducing the manufacturing cost.

[0040] See also Figure 2-3 Specifically, an outward-extending boss 55 is provided at the upper end of the inner annular wall of the first outer mixing chamber 501. A spacing L is left between the boss 55 and the outer annular wall of the first outer mixing chamber 501, so that the gas in the first outer mixing chamber 501 can be transmitted upward to the first gas chamber 11 through the spacing L. When the gas is transmitted upward to the boss 55, its flow direction will bend and flow in the direction of the spacing L. The inner annular wall of the first gas chamber 11 abuts against the outer side of the top of the boss 55. Therefore, the provision of the boss 55 can not only stably support the inner annular wall of the first gas chamber 11 in the fire cover 1, but also change the flow direction of the gas flowing through it, so that the gas in the first outer mixing chamber 501 can be gathered at the spacing L and transmitted upward to the large fire hole 14.

[0041] Preferably, a guide portion (not shown in the figure) is provided at the bottom of the boss 55 or the bottom surface of the boss 55 is designed as a guide surface (not shown in the figure). The guide portion or the guide surface can be an inclined surface or an arc surface with a higher outer side and a lower inner side, so as to better guide the gas transmitted to the boss 55 to the distance L.

[0042] The following combination Figure 2-3 To illustrate the fire power levels of the burner with the fire cover of this embodiment:

[0043] The burner of this embodiment has only one ring of fire, the outer ring fire, but the outer ring fire includes at least two power levels: outer ring high fire and outer ring low fire. When the gas burns in both the outer ring low fire hole 21 and the outer ring large fire hole 22, the burner's combustion power is at its highest, at the outer ring high fire level, or maximum power level. When the gas source to the outer ring large fire hole 22 is cut off and the gas burns only in the outer ring small fire hole 21, the burner's combustion power is at its lowest, at the outer ring low fire level, or minimum power level.

[0044] To further refine the burner's power settings, expand the power adjustment range, and enhance the user's cooking experience, the burner can also feature an outer ring medium power setting, with the outer ring high power setting > outer ring medium power setting > outer ring low power setting. When the burner is in the outer ring medium power setting, the gas source to the outer ring low power hole 21 is cut off, and the gas burns only in the outer ring high power hole 22.

[0045] Example 2

[0046] See also Figure 4 This embodiment differs from the first embodiment in the arrangement of the outer ring small fire holes 21 and the outer ring large fire holes 22. Specifically, the outer ring small fire holes 21 and the outer ring large fire holes 22 are arranged vertically side by side, and the outer ring small fire holes 21 and the outer ring large fire holes 22 are arranged vertically in an alternating manner. All other parts are the same as the first embodiment.

[0047] It can be seen that by designing the outer ring small fire holes 21 and the outer ring large fire holes 22 to be side by side up and down, and staggered in the vertical direction, the outer side wall of the fire cover body 1 has more space to arrange a certain number of outer ring small fire holes 21 and outer ring large fire holes 22, avoiding affecting the combustion thermal efficiency due to insufficient number of outer ring small fire holes 21 or outer ring large fire holes 22, effectively ensuring that both the outer ring high fire gear and the outer ring small fire gear have high thermal efficiency, thereby improving the thermal efficiency of the entire burner and providing users with a better cooking experience.

[0048] Example 3

[0049] See also Figure 5-8The difference between this embodiment and embodiment 1 is that the specific structure of the fire cover is different. Specifically, the fire cover body 1 is also provided with a third air cavity (not shown in the figure) that opens downward, and a number of inner ring small fire holes 31 are provided circumferentially on the inner side wall of the fire cover body 1, and the inner ring small fire holes 31 are connected to the third air cavity. In this embodiment, the third air cavity is connected to the third ejector tube 53 through the first inner mixing chamber 503 of the burner, so that the flame length and firepower of each inner ring small fire hole 31 will not change, either on or off, ensuring that each inner ring small fire hole 31 has only two states of maximum and optimal flame combustion and extinction, and the flame length of the inner ring small fire hole 31 in the burning state is unchanged compared to the flame length of the outer ring large fire hole 22, and the ejection and combustion are always in the best state, so that the flame combustion of the inner ring small fire hole 31 is always in the best combustion state. Therefore, when the gas burns only at the inner ring small fire hole 31, an inner ring small fire can be formed, further increasing the firepower adjustment range.

[0050] Furthermore, the fire cover body 1 is also provided with a fourth air cavity 14 that opens downward. The fourth air cavity 14 is located between the second air cavity 12 and the third air cavity, and the fourth air cavity 14 is connected to the fourth ejector tube 54 through the second inner mixing chamber 504 of the burner head 5. Several extremely small fire holes 32 are provided circumferentially on the inner sidewall of the fire cover body 1, connecting to the fourth air cavity 14. The extremely small fire holes 32 are arranged staggered along the circumferential direction with the inner ring of small fire holes 31, or the extremely small fire holes 32 are arranged vertically side by side with the inner ring of small fire holes 31. As a result, the same fire cover also has extremely small fire holes 32. When gas burns in the extremely small fire holes 32, an inner ring extremely small fire can be formed. In addition, the extremely small fire holes 32 have only two states: maximum and optimal flame combustion and extinction. This ensures that the flame length of the extremely small fire holes 32 in the burning state remains unchanged compared to the flame length of the outer ring large fire holes 22. The ejection and combustion are always in the optimal state, significantly improving the thermal efficiency of the inner ring extremely small fire.

[0051] See also Figure 5 Specifically, the fourth air cavity 14 is located outside the third air cavity, and the outer annular wall of the fourth air cavity 14 constitutes the inner annular wall of the second air cavity 12, and the inner annular wall of the fourth air cavity 14 constitutes the outer annular wall of the third air cavity. A plurality of second partitions 42 are arranged circumferentially within the third air cavity. The second partitions 42 divide the third air cavity into a plurality of inner sub-cavities 13. An inner ring small fire hole 31 is provided on the inner side wall of the inner sub-cavity 13 to connect with the inner sub-cavity 13. The very small fire hole 32 passes through the inner annular wall of the fourth air cavity 14, the second partition 42, and the inner annular wall of the third air cavity from the outside to the inside. Thus, through the second partition 42, it is convenient for the very small fire hole 32 to pass through the third air cavity and connect with the fourth air cavity 14, while ensuring that the very small fire hole 32 and the inner ring small fire hole 31 are staggered in the circumferential direction, effectively ensuring the uniformity of heating of the pot bottom when the inner ring is on very small fire.

[0052] Preferably, all the second partitions 42 are evenly spaced along the circumferential direction of the third air cavity, so that the outlets of the minimum fire holes 32 are evenly spaced on the inner and outer walls of the fire cover body 1, ensuring high thermal efficiency during the minimum fire of the inner ring and more uniform heating.

[0053] See also Figure 6 Specifically, a second gap S is left between the bottom of the second partition 42 and the bottom opening of the third air cavity. In this embodiment, the second gap S specifically refers to the height difference between the bottom of the second partition 42 and the lower end surface of the inner or outer annular wall of the third air cavity. Adjacent inner sub-cavities 13 are connected by this second gap S, which helps improve gas distribution uniformity and ensures combustion uniformity and stability for each micro-fire hole 32.

[0054] Preferably, the top surface of the second partition 42 abuts or is fixedly connected to the top of the third air cavity, and the opposite ends of the second partition 42 in the radial direction are respectively integrally formed with the opposite side walls of the third air cavity. In this way, while ensuring that the second partition 42 is firmly and reliably connected, it is also convenient for the second partition 42 to be quickly processed and formed, saving the connection process of the second partition 42 and reducing the manufacturing cost.

[0055] Preferably, the ring small fire hole 31 is composed of a third fire hole 311 or a plurality of third fire holes 311 arranged at intervals, and the very small fire hole 32 is composed of a fourth fire hole 321 or a plurality of fourth fire holes 321 arranged at intervals. Figure 1 In this embodiment, the inner ring small fire hole 31 is composed of a third fire hole 311, and the extremely small fire hole 32 is composed of a fourth fire hole 321. The extremely small fire hole 32 (i.e., the fourth fire hole 321) and the inner ring small fire hole 31 (i.e., the third fire hole 311) are arranged alternately along the circumferential direction on the inner side wall of the fire cover body 1, and the center line of the outlet of the extremely small fire hole 32 and the center line of the outlet of the inner ring small fire hole 31 are located on the same plane. Therefore, by designing the inner ring small fire hole 31 and the extremely small fire hole 32 to be staggered, a high thermal efficiency is effectively ensured during the extremely small fire in the inner ring.

[0056] In other embodiments, the inner ring small fire holes 31 and the extremely small fire holes 32 can be arranged side by side in the vertical direction on the inner wall of the fire cover body 1, and the inner ring small fire holes 31 and the extremely small fire holes 32 are staggered in the vertical direction. In this way, the inner wall of the fire cover body 1 can have more space to arrange a certain number of inner ring small fire holes 31 and extremely small fire holes 32, avoiding the influence of combustion thermal efficiency due to insufficient number of inner ring small fire holes 31 or extremely small fire holes 32, effectively ensuring high thermal efficiency during inner ring small fire and inner ring extremely small fire, improving the thermal efficiency of the entire burner, and providing users with a better cooking experience.

[0057] The following combination Figure 7-8 To illustrate the fire power levels of the burner with the fire cover of this embodiment:

[0058] The burner has only two rings of fire, namely the outer ring fire and the inner ring fire, but the outer ring fire of the burner includes the outer ring large fire and the outer ring small fire, and the inner ring fire includes the inner ring small fire and the inner ring extremely small fire. By combining the outer ring fire and the inner ring fire, multiple fire sections can be formed, specifically as follows: when the gas is burning at all the fire holes, the fire level of the burner is the largest, which is the outer ring large fire level, that is, the maximum fire level; when the gas source of the outer ring large fire hole 22 is cut off, and the gas is burning in the fire holes other than the outer ring large fire hole 22, the fire level of the burner is the outer ring small fire level, that is, the medium fire level. At this time, there are burning flames on the radial inside and outside of the burner. Compared with the existing burner with the medium fire in the middle, the medium fire power of this embodiment is more widely distributed in the radial direction, and is evenly heated in the circumferential direction, which significantly improves the heating uniformity at medium fire. When the gas burns only on the outer ring small fire hole 21 and the very small fire hole 32, a small fire power gear can be formed. At this time, there are burning flames on both the radial inner and outer sides of the burner. Compared with the existing burner with the small fire on the inner side, the small fire power of this embodiment is more widely distributed in the radial direction, and is evenly heated in the circumferential direction, and will not be too concentrated on the bottom of the pot, which significantly improves the heating uniformity during small fire and ensures that the bottom of the pot is heated more evenly. When the gas source of the outer ring large fire hole 22, the outer ring small fire hole 21 and the inner ring small fire hole 31 is cut off, and the gas burns only on the very small fire hole 32, the fire power gear of the burner is the smallest, which is the inner ring very small fire gear, that is, the very small fire gear. It can be seen that the burner has at least four fire levels: maximum fire power gear, medium fire power gear, small fire power gear and very small fire gear.

[0059] In order to make the burner's firepower gear more precise and further increase the firepower adjustment range, the burner can also have an outer ring medium fire gear and an inner ring medium and small fire power gear. When the burner is in the outer ring medium fire gear, the gas source at the outer ring small fire hole 21 is cut off, and the gas only burns in the outer ring large fire hole 22, the inner ring small fire hole 31 and the very small fire hole 32. When the burner is in the inner ring medium and small fire power gear, the gas only burns in the inner ring small fire hole 31. Therefore, although the burner only has inner ring fire and outer ring fire, it can be precisely divided into 6 gears.

[0060] Example 4

[0061] See also Figure 9 This embodiment differs from Embodiment 3 in the arrangement of the outer ring small fire holes 21 and the outer ring large fire holes 22. Specifically, the outer ring small fire holes 21 and the outer ring large fire holes 22 are arranged vertically side by side, and the outer ring small fire holes 21 and the outer ring large fire holes 22 are arranged vertically in an alternating manner. All other parts are the same as those in Embodiment 1.

[0062] It can be seen that by designing the outer ring small fire holes 21 and the outer ring large fire holes 22 to be side by side up and down, and staggered in the vertical direction, the outer side wall of the fire cover body 1 has more space to arrange a certain number of outer ring small fire holes 21 and outer ring large fire holes 22, avoiding affecting the combustion thermal efficiency due to insufficient number of outer ring small fire holes 21 or outer ring large fire holes 22, effectively ensuring high thermal efficiency during outer ring large fire and outer ring small fire, improving the thermal efficiency of the entire burner, and providing users with a better cooking experience.

[0063] Example 5

[0064] The difference between this embodiment and embodiment 3 or 4 is that the fire cover omits the fourth air cavity 14 and the extremely small fire hole 322 located on the inner wall of the fire cover body 1 and connected to the fourth air cavity 14. Correspondingly, the burner head 5 can omit the second inner mixing cavity 504 and the fourth ejector tube 54. Other parts are the same as embodiment 1.

[0065] When the gas is burning at all the fire holes, the burner has the largest fire power gear, which is the outer ring high fire gear, that is, the maximum fire power gear; when the gas is burning only on the outer ring small fire holes 21 and the inner ring small fire holes 31, a low fire power gear can be formed. Compared with the existing burner with the small fire on the inside, the fire power of the low fire in this embodiment is more widely distributed in the radial direction, and is evenly heated in the circumferential direction without being too concentrated on the bottom of the pot, which significantly improves the heating uniformity during low fire and ensures that the bottom of the pot is heated more evenly; when the gas is burning only on the inner ring small fire holes 31, the burner has the smallest fire power gear, which is the very low fire gear.

[0066] It can be seen that the fire cover omits the fourth air cavity 14 and the minimum fire hole 322, so that the same fire cover has two rings and three gears (i.e., maximum fire power gear, low fire power gear and minimum fire gear), while making the overall structure of the fire cover simpler, reducing manufacturing difficulty and reducing costs.

[0067] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, which all fall within the scope of protection of the present invention.

Claims

1. A fire cover for a burner, comprising a ring-shaped fire cover body (1), wherein the fire cover body (1) is provided with a first air cavity and a second air cavity (12) opening downward, wherein: The first air cavity and the second air cavity (12) are respectively connected to different ejector tubes, and the outer wall of the fire cover body (1) is circumferentially provided with a plurality of outer ring small fire holes (21) and outer ring large fire holes (22) arranged in a staggered manner or arranged side by side up and down, the outer ring large fire holes (22) are connected to the first air cavity, and the outer ring small fire holes (21) are connected to the second air cavity (12); The first air cavity is located outside the second air cavity (12), and a plurality of first partitions (41) are arranged at intervals in the circumferential direction in the first air cavity. The first partitions (41) divide the first air cavity into a plurality of outer air cavities (11). The outer side walls of the outer air cavities (11) are provided with the outer ring large fire holes (22), and the outer ring small fire holes (21) sequentially penetrate the outer ring wall of the second air cavity (12), the first partitions (41), and the outer ring wall of the first air cavity; A first gap H is left between the bottom of the first partition (41) and the bottom opening of the first air cavity, and the adjacent outer air cavities (11) are connected through the first gap H.

2. A fire cover for a burner according to claim 1, characterized in that: The top surface of the first partition (41) abuts against or is fixedly connected to the top of the first air cavity, and opposite ends of the first partition (41) in the radial direction are integrally formed with opposite side walls of the first air cavity.

3. A fire cover for a burner according to claim 1, characterized in that: The outer ring small fire holes (21) and the outer ring large fire holes (22) are staggered in the circumferential direction, and the center lines of the outlets of the outer ring small fire holes (21) and the center lines of the outlets of the outer ring large fire holes (22) are located on the same plane; Alternatively, the outer ring small fire holes (21) and the outer ring large fire holes (22) are arranged side by side in the vertical direction, and the outer ring small fire holes (21) and the outer ring large fire holes (22) are arranged alternately in the vertical direction.

4. A fire cover for a burner according to claim 1, characterized in that: The outer ring large fire hole (22) is composed of a first fire hole (221) or a plurality of first fire holes (221) arranged at intervals, and the outer ring small fire hole (21) is composed of a second fire hole (211) or a plurality of second fire holes (211) arranged at intervals.

5. A fire cover for a burner according to any one of claims 1 to 4, characterized in that: The fire cover body (1) is further provided with a third air cavity opening downwards, and a plurality of inner ring small fire holes (31) are circumferentially provided on the inner side wall of the fire cover body (1), and the inner ring small fire holes (31) are connected to the third air cavity.

6. A fire cover for a burner according to claim 5, characterized in that: The fire cover body (1) is further provided with a fourth air cavity (14) opening downward, and the fourth air cavity (14) is located between the second air cavity (12) and the third air cavity. A plurality of extremely small fire holes (32) communicating with the fourth air cavity (14) are circumferentially provided on the inner side wall of the fire cover body (1), and the extremely small fire holes (32) and the inner ring small fire holes (31) are arranged alternately in the circumferential direction, or the extremely small fire holes (32) and the inner ring small fire holes (31) are arranged side by side in the vertical direction.

7. A fire cover for a burner according to claim 6, characterized in that: The fourth air cavity (14) is located at the periphery of the third air cavity, and a plurality of second partitions (42) are arranged at circumferential intervals in the third air cavity. The second partitions (42) divide the third air cavity into a plurality of inner air cavities (13). The inner side walls of the inner air cavities (13) are provided with the inner ring small fire holes (31), and the extremely small fire holes (32) sequentially penetrate the inner ring wall of the fourth air cavity (14), the second partitions (42) and the inner ring wall of the third air cavity.

8. A fire cover for a burner according to claim 7, characterized in that: A second gap S is left between the bottom of the second partition (42) and the bottom opening of the third air cavity, and the adjacent inner air cavities (13) are connected through the second gap S.

9. A fire cover for a burner according to claim 7, characterized in that: The top surface of the second partition (42) abuts against or is fixedly connected to the top of the third air cavity, and opposite ends of the second partition (42) in the radial direction are integrally formed with opposite side walls of the third air cavity.

10. A fire cover for a burner according to claim 6, characterized in that: The inner ring small fire hole (31) is composed of a third fire hole (311) or a plurality of third fire holes (311) arranged at intervals, and the extremely small fire hole (32) is composed of a fourth fire hole (321) or a plurality of fourth fire holes (321) arranged at intervals.

Images