Outer ring fire cover, burner and gas cooker

Abstract

The present invention discloses an outer ring fire cover, a burner and a gas cooker, wherein the outer ring fire cover comprises: an outer ring fire cover body, formed with a gas storage cavity; a plurality of middle ring fire holes, the plurality of middle ring fire holes are arranged on the outer ring fire cover body, and the plurality of middle ring fire holes are connected with the gas storage cavity; and a plurality of outer ring fire holes, the plurality of outer ring fire holes are arranged on the outer ring fire cover body, and are located on the outer side of the plurality of middle ring fire holes on the outer ring fire cover body, and the plurality of outer ring fire holes are connected with the gas storage cavity; the ratio of the total fire hole area of ​​the plurality of outer ring fire holes to the total fire hole area of ​​the plurality of middle ring fire holes is not less than 1.2. The present invention makes the ratio of the total fire hole area of ​​the plurality of outer ring fire holes to the total fire hole area of ​​the plurality of middle ring fire holes not less than 1.2, so that the plurality of middle ring fire holes divert the gas ejected by the plurality of outer ring fire holes, so as to improve the stability of the outer ring fire formed by the outer ring fire holes and the middle ring fire of the middle ring fire holes.

Description

Technical Field

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

[0002] Gas cookers have been widely used for cooking and heating. The burner includes a gas distribution plate and a fire cover. After the gas is diverted by the gas distribution plate, it enters the fire cover and is ejected through the fire holes. The gas ejected outward is ignited to form a flame to heat the food, thereby realizing a variety of cooking modes. Due to the unreasonable distribution of the fire holes, the existing burner has uneven fire distribution and unstable flames, which easily causes large fluctuations in the temperature in the pot and reduces the cooking quality. Summary of the invention

[0003] The main purpose of the present invention is to provide an outer ring fire cover, a burner and a gas cooker, aiming to improve the problem of unstable flame of the existing burner.

[0004] To achieve the above object, the outer ring fire cover proposed by the present invention is used for a burner, and the outer ring fire cover comprises:

[0005] The outer ring fire cover body is formed with a gas storage cavity;

[0006] A plurality of middle ring fire holes, wherein the plurality of middle ring fire holes are arranged in a ring on the outer ring fire cover body, the plurality of middle ring fire holes are distributed at intervals along the circumference of the outer ring fire cover body, and the plurality of middle ring fire holes are connected to the gas storage cavity; and

[0007] A plurality of outer ring fire holes, the plurality of outer ring fire holes are arranged in a ring on the outer ring fire cover body, the plurality of outer ring fire holes are distributed at intervals along the circumference of the outer ring fire cover body, and are located on the outer side of the plurality of middle ring fire holes on the outer ring fire cover body, and the plurality of outer ring fire holes are connected to the gas storage cavity;

[0008] The ratio of the total fire hole area of ​​the plurality of outer ring fire holes to the total fire hole area of ​​the plurality of middle ring fire holes is not less than 1.2.

[0009] Optionally, a temperature detector is provided on the inner side of the outer ring fire cover body, and the ratio of the total fire hole area of ​​the plurality of outer ring fire holes to the total fire hole area of ​​the plurality of middle ring fire holes is not less than 2.

[0010] Optionally, the diameter of the middle ring fire hole is not greater than 1.6 mm.

[0011] Optionally, the plurality of middle ring fire holes include a first fire hole area and a second fire hole area, and the first fire hole area and the second fire hole area respectively include a plurality of fire holes connected to the gas storage cavity;

[0012] The first fire hole area and the second fire hole area are staggered along the circumference of the outer ring fire cover, and the number of fire holes in the first fire hole area is greater than the number of fire holes in the second fire hole area.

[0013] Optionally, the first fire hole zone includes a main fire hole and a flame stabilizing fire hole arranged beside the main fire hole, and the diameter of the main fire hole is larger than the diameter of the flame stabilizing fire hole.

[0014] Optionally, the number of the flame stabilizing holes is at least 2.

[0015] Optionally, the diameter of the flame stabilizing hole is not greater than 1.4 mm.

[0016] Optionally, the diameter of the fire holes in the second fire hole zone is smaller than the diameter of the main fire hole.

[0017] Optionally, the outer ring fire cover body comprises:

[0018] Inner ring wall;

[0019] An outer ring wall is arranged on the outer side of the inner ring wall, and a plurality of outer ring fire holes are arranged on the outer ring wall; and

[0020] The top wall is connected to the inner ring wall and the outer ring wall respectively. The inner ring wall, the top wall and the outer ring wall enclose the gas storage cavity. A plurality of middle ring fire holes are arranged on the top wall.

[0021] Optionally, a surface of the inner ring wall on one side facing away from the air storage cavity is recessed with a guide groove for guiding the airflow toward the multiple middle ring fire holes. The number of the guide grooves is multiple and the multiple guide grooves are arranged at circumferential intervals along the inner ring wall.

[0022] Optionally, one end of the guide groove close to the middle ring fire hole is located between the first fire hole area and the second fire hole area.

[0023] Optionally, a guide wall is provided between the top wall and the inner ring wall, and a guide slope is formed on the side surface of the guide wall facing away from the air storage chamber. The guide slope extends obliquely from the axis of the outer ring fire cover toward the inner edge of the top wall, and the end of the middle ring fire hole away from the air storage chamber is provided on the guide slope.

[0024] Optionally, in the projection of the guide slope in a cross section parallel to the axial direction of the outer ring fire cover, an angle between the guide slope and a horizontal plane is not greater than 40° and not less than 20°.

[0025] The present invention also provides a burner, comprising:

[0026] A gas distribution plate, wherein the gas distribution plate is formed with an outer annular cavity and an inner annular cavity;

[0027] An inner ring fire cover is arranged on the gas distribution plate, and the inner ring fire cover is provided with an inner ring fire hole communicating with the inner ring cavity; and

[0028] The outer ring fire cover, as mentioned above, has its main body arranged on the gas distribution plate and arranged around the outer side of the inner ring fire cover, and the outer ring cavity is connected to the gas storage cavity.

[0029] Optionally, a central cavity is formed between the outer ring fire cover body and the inner ring fire cover, and a secondary air passage connected to the central cavity is formed on the air distribution plate.

[0030] Optionally, a protrusion is provided on the air distribution plate, and the protrusion protrudes into the secondary air channel to guide the secondary air in the secondary air channel toward the multiple middle ring fire holes of the outer ring fire cover.

[0031] The present invention further provides a gas cooker, which comprises the burner as described above.

[0032] The technical solution of the present invention adopts a plurality of middle ring fire holes and a plurality of outer ring fire holes in coordination so that the ratio of the total fire hole area of ​​the plurality of outer ring fire holes to the total fire hole area of ​​the plurality of middle ring fire holes is not less than 1.2, so that the plurality of middle ring fire holes can divert the gas sprayed by the plurality of outer ring fire holes to enhance the stability of the outer ring fire formed by the outer ring fire holes and the middle ring fire of the middle ring fire holes, thereby enabling the outer ring fire cover to present a preset uniform combustion state. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0034] Figure 1 It is a structural schematic diagram of an embodiment of an outer ring fire cover of the present invention;

[0035] Figure 2 It is a structural schematic diagram of an embodiment of the outer ring fire cover gas storage cavity side of the present invention;

[0036] Figure 3 It is a structural schematic diagram of an embodiment of the outer ring fire cover in use state of the present invention;

[0037] Figure 4 It is a structural schematic diagram of an embodiment of the air intake side of the outer ring fire cover of the present invention when it is in use;

[0038] Figure 5It is a structural schematic diagram of an embodiment of the internal structure of the outer ring fire cover of the present invention when it is in use;

[0039] Figure 6 It is a structural schematic diagram of an embodiment of the outer ring fire cover and the gas distribution plate in the decomposed state of the present invention.

[0040] Description of Figure Numbers:

[0041] Label name Label name 10 Gas distributor 11 Outer ring cavity 12 Inner ring cavity 13 Secondary air duct 14 Bump 20 Outer ring fire cover body 21 Inner ring wall 211 Diversion trough 22 Top wall 23 Guide wall 231 Central ring fire hole 232 The first fire hole area 232a Main fire hole 232b Flame-stabilizing hole 233 Second fire hole area 24 Outer ring wall 25 Outer ring fire hole 26 Flame stabilizing tank 27 External flame stabilizing hole 30 Central cavity

[0042] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0045] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0046] The present invention provides an outer ring fire cover for a burner, wherein the outer ring fire cover is used to spray to form an outer ring flame and a middle ring flame. The outer ring flame and the middle ring flame are both used to heat the cookware. The burner may also include an inner ring fire cover, wherein the outer ring fire cover is arranged on the outer side of the inner ring fire cover to form an inner ring flame, and cooperates with the outer ring fire cover to form a three-ring fire state.

[0047] See also Figure 1 and Figure 2In one embodiment, the outer ring fire cover includes: an outer ring fire cover body 20, which is formed with an air storage cavity; a plurality of middle ring fire holes 231, wherein the plurality of middle ring fire holes 231 are arranged on the outer ring fire cover body 20, and the plurality of middle ring fire holes 231 are connected to the air storage cavity; and a plurality of outer ring fire holes 25, wherein the plurality of outer ring fire holes 25 are arranged on the outer ring fire cover body 20, and are located on the outer side of the plurality of middle ring fire holes 231 on the outer ring fire cover body 20, and the plurality of outer ring fire holes 25 are connected to the air storage cavity; the ratio of the total fire hole area of ​​the plurality of outer ring fire holes 25 to the total fire hole area of ​​the plurality of middle ring fire holes 231 is not less than 1.2.

[0048] The outer ring fire cover body 20 can be annular as a whole, and the plurality of outer ring fire holes 25 are distributed at intervals along the circumference of the outer ring fire cover body 20, and the gas in the gas storage chamber is ejected through the outer ring fire holes 25 to form an outer ring flame; the plurality of middle ring fire holes 231 are distributed at intervals along the circumference of the outer ring fire cover body 20, and the gas in the gas storage chamber is ejected through the plurality of middle ring fire holes 231 to form a middle ring flame.

[0049] The ratio of the total fire hole area of ​​the plurality of outer ring fire holes 25 to the total fire hole area of ​​the plurality of middle ring fire holes 231 is not less than 1.2, so that the gas in the gas storage chamber is dispersedly output through the outer ring fire holes 25 and the middle ring fire holes 231. In this embodiment, the ratio of the total fire hole area of ​​the plurality of outer ring fire holes to the total fire hole area of ​​the plurality of middle ring fire holes can be 1.2, or 1.5, or 1.7, or 1.8, or 2, which can be set according to the specific structure of the burner where the outer ring fire cover is located. The middle ring fire holes 231 can share the gas load of the outer ring fire holes 25, so that the flame of the outer ring fire holes 25 is more stable.

[0050] In order to improve the stability of the flame formed by the outer ring fire hole 25, an outer flame stabilizing hole 27 for stabilizing the flame of the outer ring fire hole 25 may be provided on the outer ring fire cover body 20, and an airflow is formed through the outer flame stabilizing hole 27 to stabilize the flame of the outer ring fire hole 25. When the outer flame stabilizing hole 27 is provided, a flame stabilizing groove 26 may be provided beside the outer ring fire hole 25, and the end of the outer flame stabilizing hole 27 away from the gas storage cavity is connected to the flame stabilizing groove 26, so that the airflow formed by the outer flame stabilizing hole 27 has a better flame stabilizing effect on the outer ring fire hole 25. The flame stabilizing groove 26 may be opened to connect to the outer ring fire hole 25, so as to divert the airflow of the outer ring fire hole 25, so as to reduce the airflow pressure of the outer ring fire hole 25, and thereby improve the stability of the outer ring flame formed by the outer ring fire hole 25.

[0051] The middle ring fire holes 231 can be arranged toward the axial direction of the outer ring fire cover so that the flame formed by the middle ring fire holes 231 can be directed toward the bottom surface of the cookware. Since the ratio of the total fire hole area of ​​the outer ring fire holes 25 to the total fire hole area of ​​the middle ring fire holes 231 is not less than 1.2, the amount of airflow output from the outer ring fire holes 25 is greater than the amount of airflow output from the middle ring fire holes 231, so that the outer ring fire holes 25 can form an outer ring flame with a preset intensity. The middle ring fire holes 231 and the outer ring fire holes 25 can share the gas load with each other, so that the flames formed by the outer ring fire holes 25 and the middle ring fire holes 231 are more stable. When the ratio of the total fire hole area of ​​the outer ring fire holes 25 to the total fire hole area of ​​the middle ring fire holes 231 is less than 1.2, the outer ring flame formed by the outer ring fire holes 25 and the middle ring flame formed by the middle ring fire holes are relatively close in intensity, which may easily lead to excessively high temperatures near the center of the bottom of the pot, causing the bottom of the pot to easily become sticky. When an inner ring fire cover is used, the middle ring flame formed by the middle ring fire holes 231 can cooperate with the inner ring flame to form a relatively stable heating surface on the bottom of the pot, which helps to further improve the uniformity of heating.

[0052] See also Figure 3 , Figure 4 and Figure 5 In this embodiment, optionally, the outer ring fire cover body 20 includes: an inner ring wall 21; an outer ring wall 24, which is arranged on the outside of the inner ring wall 21, and a plurality of outer ring fire holes 25 are arranged on the outer ring wall 24; and a top wall 22, which is respectively connected to the inner ring wall 21 and the outer ring wall 24, and the inner ring wall 21, the top wall 22 and the outer ring wall 24 enclose the air storage cavity, and a plurality of middle ring fire holes 231 are arranged on the top wall 22.

[0053] The outer ring wall 24, the top wall 22 and the inner ring wall 21 can be integrally arranged to reduce the processing gap on the outer ring fire cover body 20. The top wall 22 faces the bottom surface of the pot, and the middle ring fire hole 231 is arranged on the top wall 22 facing the bottom surface of the pot.

[0054] Further optionally, a guide wall 23 is provided between the top wall 22 and the inner ring wall 21, and a guide slope is formed on the side surface of the guide wall 23 facing away from the gas storage cavity, and the guide slope extends obliquely from the axis of the outer ring fire cover toward the inner edge of the top wall 22, and the middle ring fire hole 231 is provided on the guide slope at one end away from the gas storage cavity. The guide wall 23 can be provided integrally with the top wall 22. The middle ring fire hole 231 forms an inclined fire hole on the guide wall 23 facing the axial direction of the outer ring fire cover body 20.

[0055] The guide bevel enables the outer ring fire cover body 20 to form an overall open structure. When the burner is running, the guide bevel can be used to allow the secondary air introduced into the burner to flow toward the middle ring fire hole 231, so as to improve the stability of the middle ring flame and the completeness of combustion, reduce the generation of harmful gases, and improve the uniformity of heating of the burner.

[0056] In order to improve the sufficiency of the middle ring flame combustion, in this embodiment, optionally, a guide groove 211 for guiding the airflow to the direction of the plurality of middle ring fire holes 231 is concavely provided on the surface of the inner ring wall 21 on one side facing away from the gas storage cavity, and the number of the guide grooves 211 is multiple, and the plurality of guide grooves 211 are arranged at intervals along the circumference of the inner ring wall 21. The guide grooves 211 form a tooth-like structure on the inner ring wall 21, and the secondary air introduced into the burner can be guided to the direction of the middle ring fire holes 231 via the guide grooves 211.

[0057] When the guide wall 23 is provided between the top wall 22 and the inner ring wall 21, the guide groove 211 guides the secondary air toward the guide wall 23. Due to the provision of the guide wall 23, the vortex generated when the airflow flows from the inner ring wall 21 to the middle ring fire hole 231 is relatively reduced, so that the amount of secondary air delivered to the middle ring fire hole 231 is larger, which helps to improve the sufficiency of the middle ring flame combustion. When the airflow flows from the guide groove 211 to the middle ring fire hole 231, the airflow can be dispersedly guided to the plurality of middle ring fire holes 231, so that the stability of the flame of the middle ring fire hole 231 is higher, and the uniformity of the combustion of the formed middle ring flame is better, so that the bottom surface of the pot can be heated more evenly. Optionally, the guide groove 211 guides the airflow to between the adjacent middle ring fire holes 231 so that the secondary air can supplement the flame formed by the middle ring fire holes 231 without causing direct impact on the airflow formed by the middle ring fire holes 231 .

[0058] Optionally, in the projection of the guide bevel on the cross section parallel to the axial direction of the outer ring fire cover, the included angle between the guide bevel and the horizontal plane is not greater than 40° and not less than 20°. When the angle between the guide bevel and the horizontal plane is greater than 40°, it is easy to cause the angle of the guide bevel to be too large, which is inconvenient to shape the middle ring fire hole 231. When the secondary air is guided to the middle ring fire hole 231, it is easy to cause a collision with the air outlet of the middle ring fire hole 231, resulting in the air flow rate of the middle ring fire hole 231 being affected, and it is also possible to cause the direction of the flame formed by the middle ring fire hole 231 to change, affecting the heating range of the burner. When the angle between the guide slope and the horizontal plane is less than 20°, the guide slope is close to the horizontal plane, and the middle ring flame formed is away from the axial direction of the outer ring fire cover body 20, so that the flame formed by the middle ring fire hole 231 is closer to the outer ring flame formed by the outer ring fire hole 25, which can easily cause the outer ring flame temperature of the burner to be too high and affect the uniformity of heating. When the secondary air flows toward the guide slope, the wake vortex generated by the secondary air at the connection between the guide slope and the inner ring wall 21 is relatively large, which affects the airflow direction formed by the middle ring fire hole 231, thereby greatly reducing the intensity of the middle ring flame formed by the middle ring fire hole 231.

[0059] In one embodiment, a temperature detector is provided on the inner side of the outer ring fire cover body 20, and the ratio of the total fire hole area of ​​the plurality of outer ring fire holes 25 to the total fire hole area of ​​the plurality of middle ring fire holes 231 is not less than 2. When a temperature detector is provided, the middle ring flame formed by the middle ring fire hole 231 is likely to interfere with the temperature detector, affecting the normal operation of the temperature detector. By making the ratio of the total fire hole area of ​​the outer ring fire holes 25 of the plurality of middle ring fire holes 231 to the total fire hole area of ​​the plurality of middle ring fire holes 231 not less than 2, the total fire hole area of ​​the outer ring fire holes 25 is much larger than the total fire hole area of ​​the middle ring fire holes 231, and the intensity of the outer ring flame formed by the outer ring fire holes 25 is much larger than the intensity of the middle ring flame formed by the middle ring fire holes 231. Optionally, in this embodiment, the diameter of the middle ring fire hole 231 is not greater than 1.6 mm, so that the influence of the middle ring flame formed by the middle ring fire hole 231 on the temperature detector is further reduced, thereby enabling the temperature detector to work effectively for a long time.

[0060] The outer ring fire holes 25 can greatly share the gas load of the middle ring fire holes 231. By reducing the gas load of the middle ring fire holes 231, the influence of the middle ring flame formed by the middle ring fire holes 231 on the temperature detector is relatively reduced, thereby avoiding interference of the middle ring flame on the temperature detector.

[0061] In this embodiment, the angle between the guide slope of the guide wall 23 and the horizontal plane is not greater than 40° and not less than 20°. When the middle ring fire hole 231 is arranged toward the axial direction of the outer ring fire cover body 20, the influence of the middle ring flame formed by the middle ring fire hole 231 on the temperature detector is relatively reduced. When the secondary air is guided from the guide slope to the middle ring fire hole 231, the airflow tail vortex formed by the secondary air at the connection between the middle ring fire hole 231 and the inner ring wall 21 can affect the airflow formed by the middle ring fire hole 231, so that the secondary air can be fully mixed with the airflow formed by the middle ring fire hole 231. When the middle ring fire hole 231 forms a middle ring flame, the length of the flame generated is relatively reduced, and the influence of the flame on the temperature detector is further reduced.

[0062] When the guide groove 211 is provided on the inner ring wall 21 of the outer ring fire cover body 20, when the guide groove 211 guides the secondary air to the middle ring fire hole 231, combined with the setting of the guide slope, the secondary air can be more fully mixed with the airflow formed by the middle ring fire hole 231, so that the airflow formed by the middle ring fire hole 231 can burn quickly, reducing the direct impact of the middle ring flame on the temperature detector, thereby reducing the interference of the middle ring flame on the temperature detector.

[0063] Since the ratio of the total fire hole area of ​​the outer ring fire holes 25 to the total fire hole area of ​​the middle ring fire holes 231 is greater than or equal to 2, the middle ring flame formed by the middle ring fire holes 231 is relatively smaller, and the outer ring fire holes 25 can have a flame stabilizing effect on the middle ring fire holes 231, so that the middle ring flame formed by the middle ring fire holes 231 is more stable, and the impact on the temperature detector during combustion is further reduced.

[0064] See also Figure 1 In one embodiment, the plurality of middle ring fire holes 231 include a first fire hole area 232 and a second fire hole area 233, and the first fire hole area 232 and the second fire hole area 233 respectively include a plurality of fire holes connected to the gas storage cavity; the first fire hole area 232 and the second fire hole area 233 are staggered along the circumference of the outer ring fire cover, and the number of fire holes in the first fire hole area 232 is greater than the number of fire holes in the second fire hole area 233. The airflow formed by the first fire hole area 232 and the airflow formed by the second fire hole area 233 interact with each other to achieve a mutual flame stabilization effect.

[0065] Since the number of fire holes in the first fire hole area 232 and the second fire hole area 233 is different, and the first fire hole area 232 and the second fire hole area 233 are staggered, the flames formed by the first fire hole area 232 and the second fire hole area 233 have different intensities, and the flames with different intensities are staggered, so that the flames formed by the first fire hole area 232 and the flames formed by the second fire hole area 233 are mutually flame-stabilized. When the secondary air is guided to the middle ring fire hole 231 through the inner side of the outer ring fire cover body 20, the airflows of the first fire hole area 232 and the second fire hole area 233 can disperse the secondary air to make full use of the secondary air to improve the stability of the middle ring flame.

[0066] The flame intensities formed by the first fire hole area 232 and the second fire hole area 233 are different, and the two interfere with each other, so that the interference caused by the middle ring flame on the temperature detector is suppressed, avoiding the flame formed by the middle ring fire hole 231 from continuously affecting the temperature detector.

[0067] When the guide groove 211 is provided, one end of the guide groove 211 close to the middle ring fire hole 231 is located between the first fire hole area 232 and the second fire hole area 233, so that the secondary air is dispersedly guided between the first fire hole area 232 and the second fire hole area 233 to supplement the fire holes of the first fire hole area 232 and the second fire hole area 233 with secondary air, while avoiding the secondary air from directly impacting the airflow of the first fire hole area 232 and the second fire hole area 233.

[0068] In this embodiment, the first fire hole area 232 includes a main fire hole 232a and a flame stabilizing fire hole 232b disposed beside the main fire hole 232a, wherein the diameter of the main fire hole 232a is greater than the diameter of the flame stabilizing fire hole 232b. The flame stabilizing fire hole 232b may be a plurality of flame stabilizing fire holes 232b disposed at intervals beside the main fire hole 232a. By making the diameter of the flame stabilizing fire hole 232b smaller than the diameter of the main fire hole 232a, the airflow velocities of the main fire hole 232a and the flame stabilizing fire hole 232b are different, thereby achieving a mutual flame stabilization effect. In this embodiment, the flame stabilizing fire holes 232b are symmetrically disposed on both sides of the main fire hole 232a, and the flame stabilizing fire holes 232b are disposed close to the inner ring wall 21, so that the airflow formed by the main fire hole 232a is farther away from the temperature detector, thereby reducing the impact on the temperature detector. Optionally, the diameter of the flame stabilizing hole 232b is not greater than 1.4 mm, and the diameter of the main fire hole 232a is not greater than 1.6 mm, so as to avoid the flame interfering with the temperature detector due to the excessive inner diameters of the flame stabilizing hole 232b and the main fire hole 232a.

[0069] Further optionally, the diameter of the fire hole of the second fire hole zone 233 is smaller than the diameter of the main fire hole 232a, and the second fire hole zone 233 can be used to stabilize the flame of the main fire hole 232a of the first fire hole zone 232. At the same time, by making the fire hole of the second fire hole zone 233 smaller than the fire hole diameter of the main fire hole 232a, the interference of the flame formed by the second fire hole zone 233 on the temperature detector can be further reduced.

[0070] Based on the above outer ring fire cover, the present invention also provides an embodiment of a burner.

[0071] See also Figures 3 to 6 The burner includes: a gas distribution plate 10, which is formed with an outer ring cavity 11 and an inner ring cavity 12; an inner ring fire cover, which is arranged on the gas distribution plate 10, and the inner ring fire cover is provided with an inner ring fire hole connected to the inner ring cavity 12; and an outer ring fire cover, as described in any of the aforementioned embodiments, the outer ring fire cover body 20 of the outer ring fire cover is arranged on the gas distribution plate 10, and is arranged around the outer side of the inner ring fire cover, and the outer ring cavity 11 is connected to the gas storage cavity.

[0072] The gas distribution plate 10 can be installed on the burner to realize the input of airflow. The inner ring fire cover is used to form an inner ring flame. Since the ratio of the total fire hole area of ​​the plurality of outer ring fire holes 25 to the total fire hole area of ​​the plurality of middle ring fire holes 231 is not less than 1.2, the middle ring fire holes 231 cooperate with the inner ring fire holes to heat the bottom surface of the cookware, thereby avoiding the problem of excessively high flame temperature formed by the middle ring fire holes 231 and the inner ring fire holes, and making the flame formed by the burner more uniform. Since it is relatively difficult to introduce secondary air into the middle ring fire holes 231 and the inner ring fire holes, by adopting the above-mentioned ratio setting, the demand for secondary air by the middle ring fire holes 231 is relatively reduced, thereby improving the combustion efficiency of the gas.

[0073] When the temperature detector is provided, the temperature detector is provided between the inner ring fire cover and the outer ring fire cover. By making the ratio of the total fire hole area of ​​the plurality of outer ring fire holes 25 to the total fire hole area of ​​the plurality of inner ring fire holes not less than 2, the interference of the middle ring fire hole 231 on the temperature detector is relatively reduced, which helps to improve the stability of the temperature detector operation.

[0074] Optionally, a central cavity 30 is formed between the outer ring fire cover body 20 and the inner ring fire cover, and a secondary air channel 13 connected to the central cavity 30 is formed on the gas distribution plate 10. Secondary air is transported to the middle ring fire hole 231 and the inner ring fire hole through the secondary air channel 13, which is beneficial to improve the combustion efficiency of the gas and reduce the generation of harmful gases.

[0075] Further optionally, a protrusion 14 is provided on the gas distribution plate 10, and the protrusion 14 protrudes into the secondary air channel 13 to guide the secondary air in the secondary air channel 13 to the direction of the multiple middle ring fire holes 231 of the outer ring fire cover. The protrusion 14 is arranged close to the inner ring fire cover so that the secondary air in the secondary air channel 13 can be guided to the direction of the middle ring fire holes 231. When the guide groove 211 is provided on the outer ring fire cover body 20, the secondary air is dispersedly guided along the guide groove 211 to the middle ring fire holes 231, so that the secondary air can fully act on the middle ring fire holes 231 to improve the stability of the middle ring flame and the sufficiency of combustion.

[0076] The present invention further provides an embodiment of a gas cooker, wherein the gas cooker comprises a burner as described in any of the above embodiments.

Claims

1. An outer ring fire cover for a burner, characterized in that: The outer ring fire cover comprises: The outer ring fire cover body comprises an inner ring wall, an outer ring wall and a top wall, wherein the outer ring wall is arranged on the outer side of the inner ring wall, the top wall is connected to the inner ring wall and the outer ring wall respectively, the outer ring wall, the top wall and the inner ring wall are arranged in one piece, and the inner ring wall, the top wall and the outer ring wall enclose a gas storage cavity; A plurality of middle ring fire holes, wherein the plurality of middle ring fire holes are arranged in a ring on the top wall, the plurality of middle ring fire holes are distributed at intervals along the circumference of the outer ring fire cover body, and the plurality of middle ring fire holes are connected to the gas storage cavity; and A plurality of outer ring fire holes, the plurality of outer ring fire holes are arranged in a ring on the outer ring wall, the plurality of outer ring fire holes are distributed at intervals along the circumference of the outer ring fire cover body, and are located on the outer sides of the plurality of middle ring fire holes on the outer ring fire cover body, and the plurality of outer ring fire holes are connected to the gas storage cavity; A guide groove for guiding the airflow toward the plurality of middle ring fire holes is recessed on a surface of the inner ring wall on one side facing away from the air storage chamber. The guide grooves are multiple in number and are spaced apart circumferentially along the inner ring wall. The ratio of the total fire hole area of ​​the plurality of outer ring fire holes to the total fire hole area of ​​the plurality of middle ring fire holes is not less than 1.

2.

2. The outer ring fire cover according to claim 1, characterized in that: A temperature detector is provided on the inner side of the outer ring fire cover body, and the ratio of the total fire hole area of ​​the plurality of outer ring fire holes to the total fire hole area of ​​the plurality of middle ring fire holes is not less than 2.

3. The outer ring fire cover according to claim 2, characterized in that: The diameter of the middle ring fire hole is not greater than 1.6 mm.

4. The outer ring fire cover according to any one of claims 1 to 3, characterized in that: The plurality of middle ring fire holes include a first fire hole area and a second fire hole area, wherein the first fire hole area and the second fire hole area respectively include a plurality of fire holes connected to the gas storage cavity; The first fire hole area and the second fire hole area are staggered along the circumference of the outer ring fire cover, and the number of fire holes in the first fire hole area is greater than the number of fire holes in the second fire hole area.

5. The outer ring fire cover according to claim 4, characterized in that: The first fire hole zone includes a main fire hole and a flame stabilizing fire hole arranged beside the main fire hole, and the diameter of the main fire hole is larger than the diameter of the flame stabilizing fire hole.

6. The outer ring fire cover according to claim 5, characterized in that: The number of the flame stabilizing holes is at least 2.

7. The outer ring fire cover according to claim 5, characterized in that: The diameter of the flame stabilizing hole is no more than 1.4 mm.

8. The outer ring fire cover according to claim 5, characterized in that: The diameter of the fire holes in the second fire hole zone is smaller than the diameter of the main fire hole.

9. The outer ring fire cover according to claim 4, characterized in that: One end of the guide groove close to the middle ring fire hole is located between the first fire hole area and the second fire hole area.

10. The outer ring fire cover according to claim 1, characterized in that: A guide wall is provided between the top wall and the inner ring wall, and a guide slope is formed on the surface of the guide wall facing away from the air storage chamber. The guide slope extends obliquely from the axis of the outer ring fire cover toward the inner edge of the top wall, and the end of the middle ring fire hole away from the air storage chamber is provided on the guide slope.

11. The outer ring fire cover according to claim 10, characterized in that: In the projection of the guide slope in the cross section parallel to the axial direction of the outer ring fire cover, the angle between the guide slope and the horizontal plane is not greater than 40° and not less than 20°.

12. A burner, characterized in that: include: A gas distribution plate, wherein the gas distribution plate is formed with an outer annular cavity and an inner annular cavity; An inner ring fire cover is arranged on the gas distribution plate, and the inner ring fire cover is provided with an inner ring fire hole communicating with the inner ring cavity; and The outer ring fire cover, as described in claims 1 to 11, the outer ring fire cover body of the outer ring fire cover is arranged on the gas distribution plate and is arranged around the outer side of the inner ring fire cover, and the outer ring cavity is connected with the gas storage cavity.

13. The burner according to claim 12, characterized in that A central cavity is formed between the outer ring fire cover body and the inner ring fire cover, and a secondary air passage communicating with the central cavity is formed on the air distribution plate.

14. The burner according to claim 13, characterized in that The air distribution plate is provided with a protrusion, and the protrusion protrudes into the secondary air channel to guide the secondary air in the secondary air channel toward the multiple middle ring fire holes of the outer ring fire cover.

15. A gas cooker, characterized in that: The gas cooker comprises the burner according to any one of claims 12 to 14.

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