Outer fire cap for a burner, burner and gas hob

Abstract

The present application relates to gas stove technical field, disclose a outer fire cover for burner, burner and gas stove, the outer fire cover is annular structure, including top wall, along the radial direction of outer fire cover and from outside to inside, top wall is inclined downward, top wall is equipped with first fire hole, and the top end of first fire hole is inclined to the direction of the central axis of outer fire cover.This application can cooperate with inner fire cover from the first fire hole, can effectively improve the initial temperature of cold state gas, thereby increasing the flame propagation speed, so that the flame is more easily stable, and the thermal efficiency is higher.

Description

Technical Field

[0001] This invention relates to the field of gas stove technology, specifically to an outer burner cap for a burner, a burner, and a gas stove. Background Technology

[0002] In related technologies, the outer burner cap of a burner typically consists of a top wall, an inner annular wall, and an outer annular wall, with flame holes provided on the outer annular wall. When the excess air coefficient increases, the concentration of methane in the mixture decreases continuously with the increase in air volume, leading to a decrease in the flame velocity. Furthermore, a larger air volume means a greater outflow velocity of the cold gas. When the concentration of methane in the mixture drops to a certain value, the flame propagation velocity becomes difficult to balance with the outflow velocity of the cold gas, disrupting the stable flame and resulting in unstable combustion phenomena such as flame detachment and flickering. Summary of the Invention

[0003] In view of this, the present invention provides an outer flame cap for a burner, a burner, and a gas stove to solve the problem that the flame is prone to detachment when the excess air coefficient is too high.

[0004] In a first aspect, the present invention provides an outer flame cover for a burner, the outer flame cover having an annular structure including a top wall. Along the radial direction of the outer flame cover and from the outside to the inside, the top wall is inclined downward. The top wall is provided with a plurality of first flame holes. The top of each first flame hole is inclined toward the central axis of the outer flame cover, and the normals of the plurality of top wall surfaces where the plurality of first flame holes are located converge at the central axis.

[0005] Beneficial effects: By having the top wall inclined downwards along the radial direction of the outer flame cap from the outside to the inside, and the top wall having a first flame hole, the top of each first flame hole is inclined towards the central axis of the outer flame cap, and the multiple normals of the multiple top wall surfaces where the multiple first flame holes are located converge at the central axis, the flame coming out of the first flame hole can cooperate with the inner flame cap, which can effectively increase the initial temperature of the cold gas, thereby increasing the flame propagation speed, making the flame easier to stabilize, and resulting in higher thermal efficiency.

[0006] Furthermore, since a separate flame stabilizing groove structure is not required, the structure of the outer flame cap is simplified.

[0007] Verification has shown that, in practical applications, this outer flame cap can produce a fully premixed flame of nearly 5.3 kW with an excess air coefficient of 1.1.

[0008] In one alternative embodiment, the angle between the top wall and the horizontal plane is A, where 13° ≤ A ≤ 17°.

[0009] Beneficial effects: The angle between the top wall and the horizontal plane is between 13° and 17°. From the outside to the inside, the top wall slopes downward. In addition, the top of the first flame hole is inclined towards the central axis of the outer flame cap. The flame coming out of the first flame hole can cooperate with the inner flame cap, which can effectively increase the initial temperature of the cold gas, thereby increasing the flame propagation speed, making the flame easier to stabilize, and resulting in higher thermal efficiency.

[0010] In one alternative embodiment, the axis of the first fire hole along the depth direction is perpendicular to the top wall, and / or the axis of the first fire hole along the depth direction coincides with the normal of the corresponding top wall surface.

[0011] Beneficial effects: Since the extension direction of the first flame hole is perpendicular to the top wall, and the top wall slopes downward from the outside to the inside, it can be ensured that the top of the first flame hole is tilted towards the central axis of the outer flame cap. The flame coming out of the first flame hole can cooperate with the inner flame cap, which can effectively increase the initial temperature of the cold gas, thereby increasing the flame propagation speed, making the flame easier to stabilize, and resulting in higher thermal efficiency.

[0012] In one alternative embodiment, the first flame hole is provided in multiple rings along the radial direction of the outer flame cap, and the first flame holes in adjacent rings are staggered.

[0013] Beneficial effects: By having multiple rings of first flame holes, with the first flame holes of adjacent rings staggered, the flame stabilization effect can be further enhanced, especially under the flame separation condition of 7.5% N2, to prevent the airflow of each first flame hole from directly converging and losing its mutual heating effect.

[0014] In one optional embodiment, the first flame hole is provided in three rings, and the distance between two adjacent first flame holes in two adjacent rings is h, where 3.1mm≤h≤3.7mm.

[0015] Beneficial effects: The first burner hole has three rings, and the hole spacing between two adjacent first burner holes in two adjacent rings is between 3.1mm and 3.7mm, which can further stabilize the flame. Especially under the flame separation condition of 7.5% N2, it can prevent the airflow of each first burner hole from directly converging and losing the mutual heating effect, and at the same time, it can also avoid the unburned gas from becoming too cold and causing local instability.

[0016] In one optional embodiment, the diameter of the first fire hole is d, where 2.2 mm ≤ d ≤ 2.6 mm.

[0017] Beneficial effects: The diameter of the first flame hole is between 2.2mm and 2.6mm, which can further stabilize the flame, especially under the flame separation condition of 7.5% N2, to prevent the airflow of each first flame hole from directly converging and losing the mutual heating effect.

[0018] In one alternative embodiment, the length of the first fire hole is L, where 4.8 mm ≤ L ≤ 5.3 mm.

[0019] Beneficial effects: The length of the first burner hole is between 4.8mm and 5.3mm, which is suitable for natural gas combustion with a maximum power of 5.3KW. It can accommodate gas composition fluctuations within a certain range, with nitrogen content not exceeding 7.5% and excess air coefficient between 1 and 1.1.

[0020] In one optional embodiment, the outer fire cover includes an inner annular wall and an outer annular wall connected to the inner and outer sides of the top wall, wherein the outer annular wall and / or the inner annular wall are stepped structures.

[0021] Beneficial effects: The outer and / or inner annular walls are stepped, which can be adapted to the shape of the flame spreader. When the outer flame cap is installed on top of the flame spreader, the entire outer surface is a flat ring, with a neat and beautiful appearance.

[0022] Secondly, the present invention also provides a burner, including an inner flame cap and an outer flame cap for the burner, wherein the inner flame cap is disposed at the center of the outer flame cap, and the outer peripheral wall of the inner flame cap is provided with a second flame hole.

[0023] Beneficial effects: The inner flame cap is located in the center of the outer flame cap. The outer peripheral wall of the inner flame cap is provided with a second flame hole. The top wall of the outer flame cap is inclined downward and is provided with a first flame hole. The top of the first flame hole is inclined towards the central axis of the outer flame cap. The flame coming out of the first flame hole can cooperate with the inner flame cap, which can effectively increase the initial temperature of the cold gas, thereby increasing the flame propagation speed, making the flame easier to stabilize, and resulting in higher thermal efficiency.

[0024] In one alternative embodiment, the burner further includes a flame distributor and an ignition needle, with the outer flame cap disposed on the flame distributor and the ignition needle passing through a notch in the flame distributor.

[0025] Thirdly, the present invention also provides a gas stove, including the aforementioned burner. Attached Figure Description

[0026] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of the outer flame cap of a burner according to an embodiment of the present invention;

[0028] Figure 2 for Figure 1 The diagram shows the radial spacing between the first flame holes of the first ring and the first flame holes of the third ring on the outer flame cap.

[0029] Figure 3 for Figure 1 A schematic diagram of the structure with the outer and middle flame caps installed behind the flame distributor;

[0030] Figure 4 for Figure 3 Top view;

[0031] Figure 5 for Figure 4 AA section view;

[0032] Figure 6 for Figure 3 Main perspective view;

[0033] Figure 7 This is a schematic diagram of the structure of a burner according to an embodiment of the present invention.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1. Outer burner cap; 100. Top wall; 101. First burner hole; 102. Outer annular wall; 103. Inner annular wall; 2. Inner burner cap; 201. Second burner hole; 3. Flame distributor; 4. Ignition needle; 5. Burner head; 6. Gas guide pipe. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] In related technologies, the outer burner cap 1 of a burner typically consists of a top wall 100, an inner annular wall, and an outer annular wall, with flame holes provided on the outer annular wall. When the excess air coefficient increases, the concentration of methane in the mixture decreases continuously with the increase in air volume, and the flame velocity of the mixture decreases accordingly. Furthermore, a larger air volume means that the outflow velocity of the cold gas also increases. When the concentration of methane in the mixture drops to a certain value, the flame propagation velocity becomes difficult to balance with the outflow velocity of the cold gas, and the stable flame is broken, resulting in unstable combustion phenomena such as flame detachment and flickering.

[0038] In the burner of the related technology, when the gas composition of the gas pipeline fluctuates (7.5% N2), 7.5% N2 will reduce the concentration of combustible substances in the mixture, causing the flame propagation speed of the mixture to decrease and making it impossible to maintain combustion.

[0039] The following is combined Figures 1 to 7 The following describes embodiments of the present invention.

[0040] According to an embodiment of the present invention, in a first aspect, an outer flame cap 1 for a burner is provided. The outer flame cap 1 has an annular structure and includes a top wall 100. Along the radial direction of the outer flame cap 1 and from the outside to the inside, the top wall 100 is inclined downward. The top wall 100 is provided with a plurality of first flame holes 101. The top of each first flame hole 101 is inclined toward the central axis of the outer flame cap 1, and the normals of the plurality of top wall surfaces where the plurality of first flame holes 101 are located converge at the central axis.

[0041] In this embodiment, the top wall 100 is inclined downward along the radial direction of the outer flame cap 1 from the outside to the inside. The top wall 100 is provided with first flame holes 101. The top of each first flame hole 101 is inclined towards the central axis of the outer flame cap 1. The normals of the multiple top wall surfaces where the multiple first flame holes 101 are located converge at the central axis. The flame coming out of the first flame hole 101 can cooperate with the inner flame cap 2, which can effectively increase the initial temperature of the cold gas, thereby increasing the flame propagation speed, making the flame easier to stabilize, and achieving higher thermal efficiency.

[0042] Furthermore, since a separate flame stabilizing groove structure is not required, the structure of the outer flame cover 1 is simplified.

[0043] Verification has shown that the outer flame cap 1, in actual application, can produce a fully premixed flame of nearly 5.3KW with an excess air coefficient of 1.1.

[0044] In one embodiment, the angle between the top wall 100 and the horizontal plane is A, where 13°≤A≤17°.

[0045] In this embodiment, the angle between the top wall 100 and the horizontal plane is between 13° and 17°. From the outside to the inside, the top wall 100 tilts downward. In addition, the top of the first flame hole 101 tilts towards the central axis of the outer flame cover 1. The flame coming out of the first flame hole 101 can cooperate with the inner flame cover 2, which can effectively increase the initial temperature of the cold gas, thereby increasing the flame propagation speed, making the flame easier to stabilize, and achieving higher thermal efficiency.

[0046] In one specific embodiment, the angle between the top wall 100 and the horizontal plane is 13°.

[0047] In this embodiment, the angle between the top wall 100 and the horizontal plane is 13°. From the outside to the inside, the top wall 100 tilts downward. In addition, the top of the first flame hole 101 tilts towards the central axis of the outer flame cover 1. The flame coming out of the first flame hole 101 can cooperate with the inner flame cover 2, which can effectively increase the initial temperature of the cold gas, thereby increasing the flame propagation speed, making the flame easier to stabilize, and achieving higher thermal efficiency.

[0048] In one specific embodiment, the angle between the top wall 100 and the horizontal plane is 14°.

[0049] In this embodiment, the angle between the top wall 100 and the horizontal plane is 14°. From the outside to the inside, the top wall 100 tilts downward. In addition, the top of the first flame hole 101 tilts towards the central axis of the outer flame cover 1. The flame coming out of the first flame hole 101 can cooperate with the inner flame cover 2, which can effectively increase the initial temperature of the cold gas, thereby increasing the flame propagation speed, making the flame easier to stabilize, and achieving higher thermal efficiency.

[0050] In one specific embodiment, the angle between the top wall 100 and the horizontal plane is 15°.

[0051] In this embodiment, the angle between the top wall 100 and the horizontal plane is 15°. From the outside to the inside, the top wall 100 tilts downward. In addition, the top of the first flame hole 101 tilts towards the central axis of the outer flame cover 1. The flame coming out of the first flame hole 101 can cooperate with the inner flame cover 2, which can effectively increase the initial temperature of the cold gas, thereby increasing the flame propagation speed, making the flame easier to stabilize and the thermal efficiency higher.

[0052] In one specific embodiment, the angle between the top wall 100 and the horizontal plane is 16°.

[0053] In this embodiment, the angle between the top wall 100 and the horizontal plane is 16°. From the outside to the inside, the top wall 100 tilts downward. In addition, the top of the first flame hole 101 tilts towards the central axis of the outer flame cover 1. The flame coming out of the first flame hole 101 can cooperate with the inner flame cover 2, which can effectively increase the initial temperature of the cold gas, thereby increasing the flame propagation speed, making the flame easier to stabilize, and achieving higher thermal efficiency.

[0054] In one specific embodiment, the angle between the top wall 100 and the horizontal plane is 17°.

[0055] In this embodiment, the angle between the top wall 100 and the horizontal plane is 17°. From the outside to the inside, the top wall 100 tilts downward. In addition, the top of the first flame hole 101 tilts towards the central axis of the outer flame cover 1. The flame coming out of the first flame hole 101 can cooperate with the inner flame cover 2, which can effectively increase the initial temperature of the cold gas, thereby increasing the flame propagation speed, making the flame easier to stabilize, and achieving higher thermal efficiency.

[0056] In one embodiment, the axis of the first fire hole 101 along the depth direction is perpendicular to the top wall 100, and / or the axis of the first fire hole 101 along the depth direction coincides with the normal of the corresponding top wall surface.

[0057] In this embodiment, since the extension direction of the first flame hole 101 is perpendicular to the top wall 100, and the top wall 100 slopes downward from the outside to the inside, it can be ensured that the top of the first flame hole 101 is inclined towards the central axis of the outer flame cover 1. The flame coming out of the first flame hole 101 can cooperate with the inner flame cover 2, which can effectively increase the initial temperature of the cold gas, thereby increasing the flame propagation speed, making the flame easier to stabilize, and achieving higher thermal efficiency.

[0058] In addition, since the extension direction of the first fire hole 101 is perpendicular to the top wall 100, it is also convenient to process the first fire hole 101.

[0059] In one embodiment not shown in the figure, the angle between the extending direction of the first fire hole 101 and the top wall 100 may be less than 90°.

[0060] In one embodiment, the first flame hole 101 is provided in multiple rings along the radial direction of the outer flame cover 1, and the first flame holes 101 in adjacent rings are staggered.

[0061] In this embodiment, by having multiple rings of the first flame hole 101, and the staggered distribution of the first flame holes 101 in adjacent rings, the flame stabilization function can be further achieved. Especially under the flame separation condition of 7.5% N2, the airflow of each first flame hole 101 is prevented from directly converging and losing its mutual heating function.

[0062] In one embodiment, the first flame hole 101 is provided in three rings, and the first flame hole 101 of the first ring and the first flame hole 101 of the third ring correspond one-to-one radially. The hole distance between two adjacent first flame holes 101 of two adjacent rings is h, 3.1mm≤h≤3.7mm.

[0063] In this embodiment, the first flame hole 101 is provided in three rings, and the first flame hole 101 of the first ring and the first flame hole 101 of the third ring correspond one-to-one radially. The hole spacing between two adjacent first flame holes 101 of two adjacent rings is between 3.1mm and 3.7mm, which can further play a role in stabilizing the flame. Especially under the flame separation condition of 7.5% N2, it prevents the airflow of each first flame hole 101 from directly converging and losing the mutual heating effect, and at the same time avoids the unburned gas from becoming too cold and causing local instability.

[0064] It should be noted that the hole spacing between two adjacent first flame holes 101 in two adjacent rings is specifically the hole spacing between two adjacent first flame holes 101 in the first and second rings, or the hole spacing between two adjacent first flame holes 101 in the second and third rings.

[0065] It should be noted that this embodiment does not limit the number of first flame holes 101 in each ring. When the size of the outer flame cover 1 is fixed, the position of each first flame hole 101 can be determined according to the hole distance between two adjacent first flame holes 101 in two adjacent rings.

[0066] It should be noted that this embodiment does not limit the included angle between the axes of two adjacent first flame holes 101 in two adjacent rings. As long as the hole spacing between two adjacent first flame holes 101 in two adjacent rings is between 3.1mm and 3.7mm, it can further play the role of flame stabilization. Especially under the flame separation condition of 7.5% N2, it can prevent the airflow of each first flame hole 101 from directly converging and losing the mutual heating effect, and at the same time, it can also avoid the unburned gas from becoming too cold and causing local instability.

[0067] In one specific embodiment, the first flame hole 101 is provided in three rings, and the first flame hole 101 of the first ring and the first flame hole 101 of the third ring correspond one-to-one radially, and the hole spacing between two adjacent first flame holes 101 of two adjacent rings is 3.1mm.

[0068] In this embodiment, the first flame hole 101 is provided in three rings, and the first flame hole 101 of the first ring and the first flame hole 101 of the third ring correspond one-to-one radially. The hole spacing between two adjacent first flame holes 101 of two adjacent rings is 3.1mm, which can further play a role in stabilizing the flame. Especially under the flame separation condition of 7.5% N2, it prevents the airflow of each first flame hole 101 from directly converging and losing the mutual heating effect, and at the same time avoids the unburned gas from becoming too cold and causing local instability.

[0069] In one specific embodiment, the first flame hole 101 is provided in three rings, and the first flame hole 101 of the first ring and the first flame hole 101 of the third ring correspond one-to-one radially, and the hole spacing between two adjacent first flame holes 101 of two adjacent rings is 3.2mm.

[0070] In this embodiment, the first flame hole 101 is provided in three rings, and the first flame hole 101 of the first ring and the first flame hole 101 of the third ring correspond one-to-one radially. The hole spacing between two adjacent first flame holes 101 of two adjacent rings is 3.2mm, which can further play a role in stabilizing the flame. Especially under the flame separation condition of 7.5% N2, it prevents the airflow of each first flame hole 101 from directly converging and losing the mutual heating effect, and at the same time avoids the unburned gas from becoming too cold and causing local instability.

[0071] In one specific embodiment, the first flame hole 101 is provided in three rings, and the first flame hole 101 of the first ring and the first flame hole 101 of the third ring correspond one-to-one radially, and the hole distance between two adjacent first flame holes 101 of two adjacent rings is 3.3mm.

[0072] In this embodiment, the first flame hole 101 is provided in three rings, and the first flame hole 101 of the first ring and the first flame hole 101 of the third ring correspond one-to-one radially. The hole spacing between two adjacent first flame holes 101 of two adjacent rings is 3.3mm, which can further play a role in stabilizing the flame. Especially under the flame separation condition of 7.5% N2, it prevents the airflow of each first flame hole 101 from directly converging and losing the mutual heating effect, and at the same time avoids the unburned gas from becoming too cold and causing local instability.

[0073] In one specific embodiment, the first flame hole 101 is provided in three rings, and the first flame hole 101 of the first ring and the first flame hole 101 of the third ring correspond one-to-one radially. The hole spacing between two adjacent first flame holes 101 of two adjacent rings is 3.4mm, which can also avoid local instability caused by the unburned gas being too cold.

[0074] In this embodiment, the first flame hole 101 is provided in three rings, and the first flame hole 101 of the first ring and the first flame hole 101 of the third ring correspond one-to-one radially. The hole spacing between two adjacent first flame holes 101 of two adjacent rings is 3.4mm, which can further play a role in stabilizing the flame. Especially under the flame separation condition of 7.5% N2, it prevents the airflow of each first flame hole 101 from directly converging and losing the mutual heating effect, and at the same time avoids the unburned gas from becoming too cold and causing local instability.

[0075] In one specific embodiment, the first flame hole 101 is provided in three rings, and the first flame hole 101 of the first ring and the first flame hole 101 of the third ring correspond one-to-one radially, and the hole spacing between two adjacent first flame holes 101 of two adjacent rings is 3.5mm.

[0076] In this embodiment, the first flame hole 101 is provided in three rings, and the first flame hole 101 of the first ring and the first flame hole 101 of the third ring correspond one-to-one radially. The hole spacing between two adjacent first flame holes 101 of two adjacent rings is 3.5mm, which can further play a role in stabilizing the flame. Especially under the flame separation condition of 7.5% N2, it prevents the airflow of each first flame hole 101 from directly converging and losing the mutual heating effect, and at the same time avoids the unburned gas from becoming too cold and causing local instability.

[0077] In one specific embodiment, the first flame hole 101 is provided in three rings, and the first flame hole 101 of the first ring and the first flame hole 101 of the third ring correspond one-to-one radially, and the hole spacing between two adjacent first flame holes 101 of two adjacent rings is 3.6mm.

[0078] In this embodiment, the first flame hole 101 is provided in three rings, and the first flame hole 101 of the first ring and the first flame hole 101 of the third ring correspond one-to-one radially. The hole spacing between two adjacent first flame holes 101 of two adjacent rings is 3.6mm, which can further play a role in stabilizing the flame. Especially under the flame separation condition of 7.5% N2, it prevents the airflow of each first flame hole 101 from directly converging and losing the mutual heating effect, and at the same time avoids the unburned gas from becoming too cold and causing local instability.

[0079] In one specific embodiment, the first flame hole 101 is provided in three rings, and the first flame hole 101 of the first ring and the first flame hole 101 of the third ring correspond one-to-one radially, and the hole spacing between two adjacent first flame holes 101 of two adjacent rings is 3.7mm.

[0080] In this embodiment, the first flame hole 101 is provided in three rings, and the first flame hole 101 of the first ring and the first flame hole 101 of the third ring correspond one-to-one radially. The hole spacing between two adjacent first flame holes 101 of two adjacent rings is 3.7mm, which can further play a role in stabilizing the flame. Especially under the flame separation condition of 7.5% N2, it prevents the airflow of each first flame hole 101 from directly converging and losing the mutual heating effect, and at the same time avoids the unburned gas from becoming too cold and causing local instability.

[0081] In one embodiment, the diameter of the first fire hole 101 is d, where 2.2mm≤d≤2.6mm.

[0082] In this embodiment, the aperture of the first flame hole 101 is between 2.2 mm and 2.6 mm, which can further play a role in stabilizing the flame, especially under the flame separation condition of 7.5% N2, to prevent the airflow of each first flame hole 101 from directly converging and losing the mutual heating effect.

[0083] In one specific embodiment, the diameter of the first flame hole 101 is 2.2 mm, which can further play a role in stabilizing the flame, especially under the flame separation condition of 7.5% N2, to prevent the airflow of each first flame hole 101 from directly converging and losing the mutual heating effect.

[0084] In one specific embodiment, the diameter of the first flame hole 101 is 2.3 mm, which can further play a role in stabilizing the flame, especially under the flame separation condition of 7.5% N2, to prevent the airflow of each first flame hole 101 from directly converging and losing the mutual heating effect.

[0085] In one specific embodiment, the diameter of the first flame hole 101 is 2.4 mm, which can further play a role in stabilizing the flame, especially under the flame separation condition of 7.5% N2, to prevent the airflow of each first flame hole 101 from directly converging and losing the mutual heating effect.

[0086] In one specific embodiment, the diameter of the first flame hole 101 is 2.5 mm, which can further play a role in stabilizing the flame, especially under the flame separation condition of 7.5% N2, to prevent the airflow of each first flame hole 101 from directly converging and losing the mutual heating effect.

[0087] In one specific embodiment, the diameter of the first flame hole 101 is 2.6 mm, which can further play a role in stabilizing the flame, especially under the flame separation condition of 7.5% N2, to prevent the airflow of each first flame hole 101 from directly converging and losing the mutual heating effect.

[0088] In one embodiment, the length of the first fire hole 101 is L, where 4.8mm ≤ L ≤ 5.3mm.

[0089] In this embodiment, the length of the first flame hole 101 is between 4.8 mm and 5.3 mm, which can be used for natural gas combustion with a maximum power of 5.3 KW. It can accommodate the fluctuation of gas composition in the pipeline within a certain range, wherein the nitrogen content does not exceed 7.5% and the excess air coefficient is between 1 and 1.1.

[0090] In one specific embodiment, the length of the first flame hole 101 is 4.8 mm, which is suitable for natural gas combustion with a maximum power of 5.3 KW. It can accommodate the fluctuation of gas composition in the pipeline within a certain range, wherein the nitrogen content does not exceed 7.5% and the excess air coefficient is between 1 and 1.1.

[0091] In one specific embodiment, the length of the first flame hole 101 is 4.9 mm, which is suitable for natural gas combustion with a maximum power of 5.3 KW. It can accommodate the fluctuation of gas composition in the pipeline within a certain range, wherein the nitrogen content does not exceed 7.5%, and the excess air coefficient is between 1 and 1.1.

[0092] In one specific embodiment, the length of the first flame hole 101 is 5.0 mm, which is suitable for natural gas combustion with a maximum power of 5.3 KW. It can accommodate the fluctuation of gas composition in the pipeline within a certain range, wherein the nitrogen content does not exceed 7.5% and the excess air coefficient is between 1 and 1.1.

[0093] In one specific embodiment, the length of the first flame hole 101 is 5.1 mm, which is suitable for natural gas combustion with a maximum power of 5.3 KW. It can accommodate the fluctuation of gas composition in the pipeline within a certain range, wherein the nitrogen content does not exceed 7.5%, and the excess air coefficient is between 1 and 1.1.

[0094] In one specific embodiment, the length of the first flame hole 101 is 5.2 mm, which is suitable for natural gas combustion with a maximum power of 5.3 KW. It can accommodate the fluctuation of gas composition in the pipeline within a certain range, wherein the nitrogen content does not exceed 7.5% and the excess air coefficient is between 1 and 1.1.

[0095] In one specific embodiment, the length of the first flame hole 101 is 5.3 mm, which is suitable for natural gas combustion with a maximum power of 5.3 KW. It can accommodate the fluctuation of gas composition in the pipeline within a certain range, wherein the nitrogen content does not exceed 7.5% and the excess air coefficient is between 1 and 1.1.

[0096] In one embodiment, the outer fire cover 1 includes an inner annular wall 103 and an outer annular wall 102 connected to the inner and outer sides of the top wall 100, wherein the outer annular wall 102 and / or the inner annular wall 103 are stepped structures.

[0097] In this embodiment, the outer annular wall 102 and / or the inner annular wall 103 are stepped structures that can be adapted to the shape of the flame spreader 3. When the outer flame cover 1 is installed above the flame spreader 3, the entire outer surface is a flat annular surface with a neat and beautiful appearance.

[0098] In one specific embodiment, the angle between the top wall 100 and the horizontal plane is between 13° and 17°. The extension direction of the first burner hole 101 is perpendicular to the top wall 100. The first burner hole 101 is provided in three rings, and the first burner hole 101 of the first ring and the first burner hole 101 of the third ring correspond one-to-one radially. The distance between the first burner hole 101 of the first ring and the first burner hole 101 of the third ring radially is between 3.1mm and 3.7mm. The diameter of the first burner hole 101 is between 2.2mm and 2.6mm, and the length of the first burner hole 101 is between 4.8mm and 5.3mm. The overall design is suitable for natural gas combustion with a maximum power of 5.3KW. It can adapt to the fluctuation of gas composition in the pipeline within a certain range, wherein the nitrogen content does not exceed 7.5%, and the excess air coefficient is between 1 and 1.1. Under the premise that the conditions of other components of the gas stove remain unchanged, the combustion stability is optimized.

[0099] According to an embodiment of the present invention, in a second aspect, a burner is also provided, including an inner flame cap 2 and an outer flame cap 1 for the burner as described above, wherein the inner flame cap 2 is disposed at the center of the outer flame cap 1, and a second flame hole 201 is provided on the outer peripheral wall of the inner flame cap 2.

[0100] In this embodiment, the inner flame cap 2 is located at the center of the outer flame cap 1. The outer peripheral wall of the inner flame cap 2 is provided with a second flame hole 201. The top wall 100 of the outer flame cap 1 is inclined downward and is provided with a first flame hole 101. The top of the first flame hole 101 is inclined towards the central axis of the outer flame cap 1. The flame coming out of the first flame hole 101 can cooperate with the inner flame cap 2 to effectively increase the initial temperature of the cold gas, thereby increasing the flame propagation speed, making the flame easier to stabilize, and achieving higher thermal efficiency.

[0101] Specifically, such as Figure 7 As shown, the top of the inner flame cover 2 is closed, and multiple second flame holes 201 are only provided on the outer peripheral wall of the inner flame cover 2. Therefore, the flame coming out of the second flame hole 201 is radially horizontal and outward, while the first flame hole 101 is tilted upward. There is a certain degree of convection between the flame coming out of the second flame hole 201 and the flame coming out of the second flame hole 201, which can effectively increase the initial temperature of the cold gas, thereby increasing the flame propagation speed, making the flame easier to stabilize and the thermal efficiency higher.

[0102] In one embodiment, the burner further includes a flame distributor 3 and an ignition needle, with an outer flame cap 1 disposed on the flame distributor 3 and the ignition needle passing through a notch in the flame distributor 3.

[0103] In one embodiment, such as Figure 7 As shown, the burner also includes a burner head 5 and a gas duct 6.

[0104] According to an embodiment of the present invention, a third aspect also provides a gas stove, including a burner.

[0105] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and all such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A burner, characterized in that, The device includes an inner flame cap (2) and an outer flame cap (1). The outer flame cap (1) is a ring structure and includes a top wall (100). Along the radial direction of the outer flame cap (1) and from the outside to the inside, the top wall (100) is inclined downward. The top wall (100) is provided with a plurality of first flame holes (101). The top of each first flame hole (101) is inclined toward the central axis of the outer flame cap (1), and the normals of the plurality of top wall surfaces where the plurality of first flame holes (101) are located converge at the central axis. The inner flame cap (2) is located at the center of the outer flame cap (1). The outer peripheral wall of the inner flame cap (2) is provided with a second flame hole (201). The angle between the top wall (100) and the horizontal plane is A, 13°≤A≤17°. The flame coming out of the second flame hole (201) is radially horizontally outward. The first flame hole (101) is inclined upward and will convect with the flame coming out of the second flame hole (201), which can increase the initial temperature of the cold gas. Along the radial direction of the outer flame cap (1), the first flame hole (101) is provided in three rings, and the first flame holes (101) of adjacent two rings are staggered. The hole distance between two adjacent first flame holes (101) of adjacent two rings is h, 3.1mm≤h≤3.7mm.

2. The burner according to claim 1, characterized in that, The axis of the first fire hole (101) along the depth direction is perpendicular to the top wall (100), and / or the axis of the first fire hole (101) along the depth direction coincides with the normal of the corresponding top wall surface.

3. The burner according to claim 1, characterized in that, The diameter of the first fire hole (101) is d, 2.2mm≤d≤2.6mm.

4. The burner according to claim 1, characterized in that, The depth of the first fire hole (101) is L, 4.8mm≤L≤5.3mm.

5. The burner according to claim 1, characterized in that, The outer fire cover (1) includes an inner annular wall (103) and an outer annular wall (102) connected to the inner and outer sides of the top wall (100), and the outer annular wall (102) and / or the inner annular wall (103) are stepped structures.

6. The burner according to claim 1, characterized in that, The burner also includes a flame divider (3) and a ignition needle. The outer flame cap (1) is disposed on the flame divider (3), and the ignition needle passes through the notch of the flame divider (3).

7. A gas stove, characterized in that, The burner includes any one of claims 1 to 6.

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