A gas stove

Abstract

This invention relates to the technical field of gas stoves, and specifically provides a gas stove comprising a burner, an inner burner cap, an outer burner cap, an inner ejector tube, and an outer ejector tube. The burner cap includes a central cavity and an inner ring and an outer ring surrounding the central cavity. Each of the inner and outer rings is provided with an air intake connecting pipe connected to the inner and outer ejector tubes, respectively. A gas buffer chamber is formed at the connection between the air intake connecting pipe and the inner or outer ring. The gas buffer chamber has an arc-shaped transition surface, which is located above the outlet of the air intake connecting pipe. Premixing chambers are formed between the inner burner cap and the inner ring, and between the outer burner cap and the outer ring, respectively. The inner burner cap and / or the outer burner cap are airflow regulating burners. The airflow regulating burners are provided with a first annular flame slit and a second annular flame slit spaced axially. The airflow regulating burners are provided with multiple flame holes spaced circumferentially, and the flame holes are respectively connected to the first and second annular flame slits.

Description

Technical Field

[0001] This invention relates to the technical field of gas stoves, and particularly to a gas stove. Background Technology

[0002] Burners, as devices that mix fuel and air in a specific ratio and ignite them safely and efficiently, are widely used in boilers, furnaces, engines, and various household gas appliances. In the household sector, such as in gas stoves and gas water heaters, premixed burners are commonly used due to their advantages of thorough mixing, rapid combustion, high flame temperature, and high efficiency. The core component of these burners typically includes a burner cap for flame distribution.

[0003] Currently, in gas stoves with dual-shaft burner heads, space is often left unused in the inner ring to accommodate devices that prevent dry burning and other safety features, or to allow for secondary air replenishment in the central flame area. This results in the injector's air inlet being off-center, requiring a series of auxiliary structures to ensure uniform gas distribution within the ring. This leads to a bulky stove structure and increases manufacturing steps. Furthermore, existing burner cap structures are prone to flame detachment or turbulent noise due to uneven gas mixture distribution. While some solutions attempt to improve combustion by using baffles to guide airflow, the significant flow resistance introduced by these baffles reduces the burner's injection performance, leading to decreased combustion efficiency and hindering overall thermal efficiency improvement. Summary of the Invention

[0004] Therefore, it is necessary to provide a gas stove.

[0005] To solve the above-mentioned technical problems, the present invention provides a gas stove, including a burner, an inner burner cap, an outer burner cap, an inner ejector tube, and an outer ejector tube. The burner includes a central cavity and an inner ring and an outer ring surrounding the central cavity. Each of the inner and outer rings is provided with an air inlet connecting pipe that connects to the inner and outer ejector tubes, respectively. A gas buffer chamber is formed at the connection between the air inlet connecting pipe and the inner or outer ring. The gas buffer chamber has an arc-shaped transition surface, which is located above the outlet of the air inlet connecting pipe. Premixing chambers are formed between the inner burner cap and the inner ring, and between the outer burner cap and the outer ring, respectively. The inner burner cap and / or the outer burner cap are airflow regulating burners, and the airflow regulating burners are provided with axially spaced... The first and second annular flame seams are provided. The side of the airflow regulating flame cap closest to the central cavity is the flame outlet surface. The openings of the first and second annular flame seams are located on the flame outlet surface, so that the openings of the first and second annular flame seams face the central cavity. The airflow regulating flame cap is provided with multiple flame holes at intervals along the circumference. The premixing chamber is connected to the first and second annular flame seams through multiple flame holes respectively. The position on the airflow regulating flame cap corresponding to the gas buffer chamber is a throttling orifice area. The area on the airflow regulating flame cap other than the throttling orifice area is a uniform orifice area. The diameter of the flame holes on the airflow regulating flame cap located in the uniform orifice area is larger than the diameter of the flame holes on the airflow regulating flame cap located in the throttling orifice area.

[0006] Preferably, the axis of the flame hole is not parallel to the axis of the airflow regulating flame cap.

[0007] Preferably, the axis of the flame hole forms a first angle with the bottom surface of the airflow regulating flame cover, the first angle being in the range of 60°-80°; the axis of the flame hole forms a second angle with the radial line of the airflow regulating flame cover, the second angle being in the range of 20°-45°.

[0008] Preferably, the airflow regulating flame cover includes an annular top plate, an inner side plate extending radially inward from the annular top plate, and an outer side plate extending radially outward from the annular top plate. The annular top plate, the inner side plate, and the outer side plate together form part of the premixing cavity. One side wall of the inner side plate located in the premixing cavity protrudes to form an annular step. The flame hole is opened on the annular step, and the opening of the flame hole communicates with the premixing cavity.

[0009] Preferably, the end of the fire hole that is axially away from the opening of the fire hole is the end of the fire hole, the end of the fire hole is connected to the first annular fire seam, and the middle part between the opening and the end of the fire hole is connected to the second annular fire seam.

[0010] Preferably, the depth extension line of the first annular fire slit is not parallel to the depth extension line of the second annular fire slit, and the depth extension line of the first annular fire slit forms an acute angle with the axis of the fire hole, and the depth extension line of the second annular fire slit forms an acute angle with the axis of the fire hole.

[0011] Preferably, the depth extension line of the first annular fire seam forms an angle of 40°-60° with the bottom surface of the airflow regulating flame cap, and the depth extension line of the second annular fire seam forms an angle of 30°-50° with the bottom surface of the airflow regulating flame cap.

[0012] Preferably, the gas stove further includes a pot support, which includes a support body and multiple mounting feet. The support body is in the shape of a continuous ring, and the center of the ring-shaped support body has a flame outlet area. The openings of the first and second annular flame seams are connected to the flame outlet area. There is a gap between the support body and the outer burner cap, and the flame outlet surface is not tilted relative to the axis of the airflow regulating burner cap.

[0013] Preferably, the upper surface of the support body is an annular inclined surface that gradually slopes downward toward the fire outlet area. The concavity in the middle section of the annular inclined surface causes the annular inclined surface to include a first convex arc surface, a concave arc surface, and a second convex arc surface arranged sequentially along the inner diameter toward the outer diameter of the support body.

[0014] Preferably, the airflow regulating flame cap is further provided with a third annular flame slit, the opening of the third annular flame slit is opened on the flame outlet surface, the third annular flame slit is axially spaced below the second annular flame slit, the opening of the third annular flame slit faces the central cavity, and the premixing chamber is connected to the first annular flame slit, the second annular flame slit and the third annular flame slit respectively through a plurality of flame holes; the depth extension line of the third annular flame slit forms an angle of 30°-50° with the bottom surface of the airflow regulating flame cap.

[0015] The beneficial effects of this invention are as follows: By using an airflow regulating flame cap with a gas channel combining flame holes and annular flame slits, a cohesive annular flame is formed within the annular flame slit. The design of first having round holes and then annular gas channels increases the depth of the flame holes, resulting in more thorough gas premixing and preheating, a more stable flame, and less likelihood of flame lift-off or flameout popping, while also increasing thermal efficiency. When applied to a central cavity burner, the local flame hole area can be flexibly changed by adjusting the diameter of the inclined flame holes on the flame cap, thereby adjusting the flame exhaust velocity. This solves the problems of uniformity and difficulty in local adjustment of traditional annular slit flame channels, effectively avoiding flame lift-off or turbulent noise caused by improper airflow velocity, and is more adaptable to irregularly shaped burner heads such as dual-shaft structures. Attached Figure Description

[0016] The above and other objects, features, and advantages of the invention will become clearer through a more detailed description of the preferred embodiments illustrated in the accompanying drawings. The same reference numerals denote the same parts throughout the drawings, and the drawings are not intentionally drawn to scale with actual dimensions; the focus is on illustrating the gist of the invention.

[0017] Figure 1 This is a schematic diagram of the overall structure of a gas stove according to a preferred embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the overall structure of the fire distributor from a top view of a preferred embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the overall structure of the fire distributor from the bottom view of a preferred embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram of the overall structure of the airflow regulating flame cover from a top view of a preferred embodiment of the present invention;

[0021] Figure 5 This is a schematic diagram of the overall structure of the airflow regulating flame cover from the bottom view of a preferred embodiment of the present invention;

[0022] Figure 6 This is a bottom view of the airflow regulating flame cover according to a preferred embodiment of the present invention;

[0023] Figure 7 This is a partial cross-sectional view of the airflow regulating flame cover from a top perspective, according to a preferred embodiment of the present invention.

[0024] Figure 8 This is a cross-sectional view of the airflow regulating flame cover of a preferred embodiment of the present invention;

[0025] Figure 9 for Figure 8 Enlarged view of part A in the middle Figure 1 ;

[0026] Figure 10 A cross-sectional view of the burner cover of the preferred embodiment of the present invention when it is equipped with an airflow regulating burner cover;

[0027] Figure 11 for Figure 8 Enlarged view of part A in the middle Figure 2 ;

[0028] Figure 12 This is a schematic cross-sectional view of the gas stove according to a preferred embodiment of the present invention;

[0029] Figure 13 This is a cross-sectional view of a gas stove with the pot support removed, according to a preferred embodiment of the present invention.

[0030] Figure 14This is a cross-sectional view of the airflow regulating flame cover according to Embodiment 2 of the present invention; Detailed Implementation

[0031] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be given below with reference to the accompanying drawings.

[0032] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to and integrated with the other component, or there may be an intervening component present. The terms "mounted," "one end," "the other end," and similar expressions used in this document are for illustrative purposes only.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0034] refer to Figures 1-13 This invention provides a gas stove, including a burner base 1 and a flame distributor 2. The flame distributor 2 includes an inner ring 3 and an outer ring 4. The middle part of the flame distributor 2 has a central cavity 6 for housing functional elements 5 (such as an ignition needle, thermocouple, and temperature sensor). The burner base 1 is provided with two ejector tubes 7 that respectively connect to the inner ring 3 and the outer ring 4. The ejector tubes 7 include an inner ejector tube communicating with the inner ring 3 and an outer ejector tube communicating with the outer ring 4. Both the inner ring 3 and the outer ring 4 are respectively provided with air intake connecting pipes 8 that connect to the inner ejector tube and the outer ejector tube, respectively. The diameter of the air intake connecting pipe 8 is larger than the width of the inner ring 3 or the outer ring 4. The air intake connecting pipe 8 connected to the inner ring 3 passes through the bottom of the inner ring 3, and the air intake connecting pipe 8 connected to the outer ring 4 passes through the bottom of the outer ring 4. By using an airflow regulating burner cap 11 with an inclined flame hole combined with an annular flame slit, a cohesive annular swirling flame is formed within the annular flame slit. The design, featuring a circular aperture followed by an annular gas channel, increases the depth of the flame holes, resulting in more thorough gas premixing and preheating, a more stable flame, and reduced risk of flame lift-off or flameout noise, while also improving thermal efficiency. When applied to burners with a central cavity, the diameter of the inclined flame holes on the burner cap can be adjusted to flexibly change the local flame hole area, thereby regulating the flame exhaust velocity. This solves the problems of uniformity and difficulty in local adjustment in traditional annular slotted gas channels, effectively preventing flame lift-off or turbulent noise caused by improper airflow velocity, and offering greater adaptability to irregularly shaped burner heads such as dual-shaft structures.

[0035] refer to Figure 2 , Figure 3 , Figure 10 and Figure 12A gas buffer chamber 9 is formed at the connection between the intake manifold 8 and the inner ring 3 or the outer ring 4. The gas buffer chamber 9 has an arc-shaped transition surface 10, which is located above the outlet of the intake manifold 8 and plays a buffering role on the airflow.

[0036] refer to Figure 1 , Figure 8 and Figure 12 The flame distributor 2 is equipped with an inner flame cap 11a and an outer flame cap 11b. A premixing chamber 12a is formed between the inner flame cap 11a and the inner ring 3, and a premixing chamber 12b is formed between the outer flame cap 11b and the outer ring 4. The gas first enters the gas buffer chamber 9, and the buffered gas flow then enters the premixing chamber 12a or the premixing chamber 12b.

[0037] The inner flame cap 11a and / or the outer flame cap 11b are structured as airflow regulating flame caps 11. It is possible that only the inner flame cap 11a is an airflow regulating flame cap 11; it is possible that only the outer flame cap 11b is an airflow regulating flame cap 11; or it is possible that both the inner flame cap 11a and the outer flame cap 11b are structured as airflow regulating flame caps 11.

[0038] like Figure 8 and 9 As shown, the airflow regulating flame cover 11 is provided with a first annular flame slit 141 and a second annular flame slit 142 spaced apart along the axial direction. The first annular flame slit 141 is located above the second annular flame slit 142, and the openings of the first annular flame slit 141 and the second annular flame slit 142 face the central cavity 6. The airflow regulating flame cover 11 is provided with a plurality of flame holes 13 spaced apart along the circumference. The premixing chamber 12a or the premixing chamber 12b is connected to the first annular flame slit 141 and the second annular flame slit 142 through the plurality of flame holes 13, respectively. The side of the airflow regulating flame cover 11 closest to the central cavity 6 is the flame outlet surface 300, and the openings of the first annular flame slit 141 and the second annular flame slit 142 are opened on the flame outlet surface, so that the openings of the first annular flame slit 141 and the second annular flame slit 142 both face the central cavity 6. The flame outlet surface is parallel to the axial direction of the airflow regulating burner cap. Specifically, the tangential line between the flame outlet surface 300 and the radial surface of the burner cap coincides with line 143R, which is a vertical line perpendicular to the bottom surface of the burner cap. This prevents spilled broth and other foreign matter from easily entering the flame seam and flame hole 13 during cooking, causing blockages, affecting combustion stability, and increasing maintenance burden.

[0039] refer to Figure 10In the cross-sectional view, in the preferred embodiment, the position on the airflow regulating flame cap 11 corresponding to the gas buffer chamber 9 is the throttling orifice region 16. The area on the airflow regulating flame cap 11 other than the throttling orifice region 16 is the uniform orifice region 17. The diameter of the flame hole 13 on the airflow regulating flame cap 11 located in the uniform orifice region 17 is the first diameter, and the diameter of the flame hole 13 on the airflow regulating flame cap 11 located in the throttling orifice region 16 is the second diameter, which is smaller than the first diameter. By reducing the diameter of the flame hole 13 in the throttling orifice region 16 of the flame cap, the diameter of the flame hole 13 in the throttling orifice region 16 is made smaller than the diameter of the flame hole 13 in the uniform orifice region 17, thereby flexibly changing the area of ​​the flame hole 13 in this local area of ​​the flame cap, and thus adjusting the flame exhaust velocity of the flame hole at that location. This solves the problem of uneven gas flow and difficulty in local adjustment in traditional annular slit gas channels. It can effectively avoid flame lift-off or turbulent noise caused by improper airflow speed and is more adaptable to irregularly shaped burners such as dual-axis structures. It does not require a series of auxiliary structures to make the gas in the ring uniform. The flame exhaust speed can be adjusted by flexibly adjusting the area of ​​the local fire hole 13 according to the combustion requirements.

[0040] The gas stove provided by this invention is a cohesive type gas stove. The central cavity 6 of the middle part of the burner 2 serves as a secondary air supply channel for the inner ring burner cap, causing the outlet of the inner injector tube to be offset relative to the middle position of the burner 2. The outlet of the air inlet connecting pipe 8 connected to the inner injector tube is also offset. To avoid uneven gas distribution caused by the offset of the inner injector tube, this invention uses an arc-shaped transition surface 10 on the gas buffer chamber 9 to provide initial turbulence for the air intake of the injector tube. The diameter of the flame hole 13 at the corresponding position of the gas buffer chamber 9 is relatively small, slowing down the gas output speed of the flame hole at that position. The diameter of the flame hole 13 in the uniform hole area 17 is larger, achieving uniform gas mixture distribution and avoiding uneven gas distribution caused by the offset of the inner injector tube. The gas stove provided by this invention has uniform gas distribution, making it less likely for the flame to be blown away from the flame hole by local high-speed gas, causing "flame detachment," and also less likely to cause incomplete combustion due to local excess or insufficient air.

[0041] refer to Figure 11 In a preferred embodiment, the axis of the flame hole 13, that is, the extension direction line of the flame hole 13, is not parallel to the axis of the airflow regulating flame cover 11. The axis of the flame hole is inclined, and the axis of the flame hole 13 forms a first angle θ with the bottom surface of the airflow regulating flame cover 11. The value of the first angle θ is in the range of 60°-80°. The flame hole 13 converges inward, and the depth of the air passage formed by the flame hole 13 and the first annular flame slit 141 is increased. The actual depth H of the air passage is deeper, and the gas premixing and preheating are more sufficient, making the flame more stable. This helps to avoid flame lift-off and flameout explosion, and the thermal efficiency is also higher.

[0042] refer to Figure 6-7In a preferred embodiment, the projection line of the axis of the flame hole 13 onto the bottom surface of the airflow regulating flame cover 11 forms a second angle γ with the radial line of the airflow regulating flame cover 11. The value of the second angle γ ranges from 20° to 45°. Through the first angle θ and the second angle γ, the circular air passage becomes a spatially inclined hole, and the flame is ejected obliquely upward and to the right, causing the flame surface to form a vortex. This prolongs the contact time between the flame and the bottom of the pot. The vortex can entrain more secondary air, resulting in more complete oxygen supply and higher combustion thermal efficiency. The setting of the γ angle causes the flame airflow to form a vortex. Increasing the γ angle increases the radial component of the vortex path, increases the entrainment of secondary air, and prolongs the contact time between the flame and the bottom of the pot, thus increasing thermal efficiency. However, if the γ angle is too large, the flames interfere with each other, making air supply difficult and resulting in incomplete combustion. Simultaneously, more heat is lost horizontally, reducing thermal efficiency. Therefore, the optimal γ angle is between 20° and 45°.

[0043] refer to Figure 8 In a preferred embodiment, the airflow regulating flame cover 11 includes an annular top plate 18. An inner side plate 19 extends radially inward from the annular top plate 18, and an outer side plate 20 extends radially outward from the annular top plate 18. Taking the inner flame cover as an example of the airflow regulating flame cover 11, the annular top plate 18, the inner side plate 19, and the outer side plate 20 together form part of the premixing cavity 12a. One side wall of the inner side plate 19 within the premixing cavity 12a protrudes to form an annular step. The annular step has a step surface 21, and flame holes 13 are formed on the annular step, allowing the flame holes 13 to have a certain depth. The opening of the flame hole 13 communicates with the premixing cavity 12a. The axis of the flame hole 13 is perpendicular or nearly perpendicular to the step surface 21 to prevent slippage during drilling. The step surface 21 may have a partially raised surface to ensure that the axis of the flame hole 13 is perpendicular or nearly perpendicular to the step surface 21.

[0044] refer to Figure 9In a preferred embodiment, the opening width L1 of the first annular fire slit 141 is greater than the opening width L2 of the second annular fire slit 142. In a further preferred embodiment, the opening width L1 of the first annular fire slit 141 is 1.2mm-1.5mm, serving as the main fire hole, and the opening width L2 of the second annular fire slit 142 is 0.7mm-1.0mm. The distance between the opening of the second annular fire slit 142 and the opening of the first annular fire slit 141 should be appropriate, ranging from 1mm to 4mm, so that the flame of the second annular fire slit 142 can form a stable flame and heating effect, while ensuring thermal efficiency and avoiding mutual interference between flames, insufficient air supply, and increased flue gas concentration. If the distance between the opening of the second annular fire slit 142 and the opening of the first annular fire slit 141 is too large, the flame stabilization effect will be poor; if the distance is too small, mutual interference between flames will occur, insufficient air supply will result in reduced combustion efficiency and increased flue gas concentration. In a preferred embodiment, the diameter of the fire hole 13 is greater than the opening width L1 of the first annular fire seam 141. In a further preferred embodiment, the diameter of the fire hole 13 is 1.5-3 times the opening width L1 of the first annular fire seam 141.

[0045] refer to Figure 8-9 In a preferred embodiment, the cross-section of the flame hole 13 is circular. The end of the flame hole 13 furthest from its opening 13a along the axial direction is the end 13b of the flame hole 13, which is the end of the airflow in the direction of the flame hole 13. The end of the first annular flame slit 141 furthest from its opening is the end of the first flame slit, and the end of the second annular flame slit 142 furthest from its opening is the end of the second flame slit. The end 13b of the flame hole 13 is connected to the end of the first flame slit of the first annular flame slit 141, and the middle part between the opening 13a and the end 13b of the flame hole is connected to the end of the second flame slit of the second annular flame slit 142, which serves as a flame stabilizer. The combination of the circular flame hole 13 and the annular air passage makes the airflow an independent flame passage when flowing inside the flame hole 13, forming a swirling flow. The flow velocity increases due to throttling at the intersection. After entering the annular flame slit, the air passage narrows in the vertical direction but widens laterally, and the airflow diffuses to both sides, connecting into a sheet to form an annular fire curtain. The airflow velocity within the circular flame holes 13 and the throttling area of ​​the intersecting surface is slow. If backfire occurs, the slow combustion velocity within the circular flame holes 13 makes it difficult for the flame to spread back into the premixing chamber, effectively suppressing backfire and flameout noise. The annular flame curtain is continuous and less prone to flame detachment. By adjusting the diameter of the inclined flame holes 13 on the burner cap, the area of ​​the flame holes 13 in a local area of ​​the burner cap can be flexibly changed, thereby adjusting the flame exhaust velocity. This solves the problem of uniformity and difficulty in local adjustment of the traditional annular slit flame channel, effectively avoiding flame detachment or turbulent noise caused by improper airflow velocity, and is more adaptable to irregularly shaped burners such as dual-axis structures. It eliminates the need for a series of auxiliary structures to achieve uniform gas flow within the ring; the flame exhaust velocity can be adjusted simply by flexibly adjusting the area of ​​the local flame holes 13 according to combustion requirements.

[0046] refer to Figure 9 In a preferred embodiment, the first annular fire seam 141 is provided with a plurality of first through holes 131 communicating with the fire holes 13, and the second annular fire seam 142 is provided with a plurality of second through holes 132 communicating with the fire holes 13. The radius of the first through holes 131 is larger than the radius of the second through holes 132.

[0047] refer to Figure 8 In a preferred embodiment, the depth extension line of the first annular fire slit 141 is the first depth extension line 151, and the depth extension line of the second annular fire slit 142 is the second depth extension line 152. The first depth extension line 151 and the second depth extension line 152 are not parallel to avoid the flames of the two annular fire slits colliding with each other. The first depth extension line 151 and the axis of the fire hole 13 form an acute angle, and the second depth extension line 152 and the axis of the fire hole 13 form an acute angle. The fire hole 13 and the through hole of the annular gas passage are at a certain angle, making the flame more stable and less prone to flame lift-off or flameout explosion.

[0048] refer to Figure 11 In a preferred embodiment, the first depth extension line 151 forms an angle β with the bottom surface of the airflow regulating flame cap 11, with the value of β ranging from 40° to 60°; the second depth extension line 152 forms an angle α with the bottom surface of the airflow regulating flame cap 11, with the value of α ranging from 30° to 50°. The annular air passage formed by the first annular flame slit 141 and the second annular flame slit 142 further connects the swirling flow ejected from the circular flame hole 13 to form a swirling annular flame curtain, resulting in a complete flame surface with better heating uniformity. The value of β ranges from 40° to 60°. The first annular flame slit 141 converges inward, and the value of β is determined based on the air supply situation. When the primary air coefficient is high, β takes a small value, the flame is more cohesive, and the thermal efficiency is increased; when the primary air coefficient is low, β takes a large value, increasing the secondary air supply space and improving combustion conditions.

[0049] The value of angle α is in the range of 30°-50°. The second annular fire seam 142 is brought inward, and α is 30°-50° to avoid interference and collision with the flame of the first annular fire seam 141 if the angle α is too large, thereby avoiding affecting the flue gas and thermal efficiency.

[0050] refer to Figure 8 In a preferred embodiment, the inner axial direction of the first annular fire seam 141, the second annular fire seam 142 and the fire hole 13 is inclined from bottom to top toward the inner side plate 19, and the fire hole 13 is a circular fire hole 13.

[0051] The airflow path of the premixed gas: The premixed gas first flows into the inclined flame hole 13 from the premixing chamber and then into the first through hole 131 and the second through hole 132, and finally is ejected from the openings of the first annular flame seam 141 and the second annular flame seam 142 of the flame cap; when the airflow enters the annular air passage with a narrow cross section through the flame hole 13, the flow velocity increases, the swirling suction force on the secondary air is enhanced, and the secondary air is replenished more fully.

[0052] Compared with existing methods of creating swirling flow using baffle plates, this solution optimizes the flow channel structure by combining oblique circular flame holes 13 with annular slit air channels. This results in a swirling annular flame with good uniformity, strong entrainment of secondary air by the swirling flow, a cohesive flame shape, and high flame temperature. In actual heating, the flame surface can achieve near-vertical heating of the pot bottom, resulting in a long contact time between the flame and the pot bottom and high thermal efficiency.

[0053] The gas enters the oblique circular hole along the flow direction within the premixing chamber 12, creating a swirling annular flame curtain with very little flow resistance. This results in better ejector premixing performance, a more solid flame, and higher thermal efficiency. It overcomes the drawback of annular slot fire, which relies on high-flow-resistance baffles to create swirling flow, significantly reducing ejector performance and thermal efficiency.

[0054] Due to its swirling characteristics and strong ejection performance, the flame of this flame cap is a cohesive swirling annular fire curtain, which is different from the existing external oblique straight fire, internal cohesive straight fire, external oblique annular seam, and external oblique swirling annular seam flames. It combines the advantages of good annular seam heating uniformity, high cohesive thermal efficiency, and strong swirling suction, and has significant superior performance.

[0055] In a preferred embodiment, the fire hole 13 and the stepped surface 21 are at a certain angle; the first annular fire seam 141 and the second annular fire seam 142 are both inclined into the middle of the vertical annular surface, and the first annular fire seam 141 and the second annular fire seam 142 have depth in the thickness direction of the inner side plate 19, but do not penetrate the inner side plate 19.

[0056] In a preferred embodiment, the gas stove further includes a pot support 22, which comprises a support body 23 and multiple mounting feet 24. The support body is a continuous ring shape, with a flame outlet area in the center. The openings of the first and second annular flame seams communicate with the flame outlet area. A gap exists between the support body and the outer burner cap, and the flame outlet surface is not tilted relative to the axis of the airflow regulating burner cap. Specifically, the pot support 22 is sleeved around the burner 2, and the multiple mounting feet 24 are arranged in a ring array on the support body 23. The annular support body has a flame outlet area in the center, and the openings of the first and second annular flame seams communicate with the flame outlet area.

[0057] To avoid insufficient secondary air supply due to the non-tilted flameout surface, a gap is provided between the support body 23 and the outer flame cap. The width of the gap ranges from 3mm to 6mm, forming a secondary air channel around the outer perimeter of the flame cap. This secondary air channel provides ample secondary air supply. The narrowest point of the secondary air channel is D1, and a width of 3mm-6mm is suitable, as it adequately supplies secondary air while minimizing excess air ingress, thereby improving thermal efficiency.

[0058] The upper surface of the support body is an annular inclined surface that gradually slopes downward toward the flame outlet zone. The concave middle section of the annular inclined surface 231 results in the annular inclined surface 231 comprising a first convex arc surface, a concave arc surface 2311, and a second convex arc surface 2312 arranged sequentially along the inner diameter toward the outer diameter of the support body. The concave arc surface is an arc surface formed by the downward concavity of the middle section of the annular inclined surface 231 of the support body 23. This concave arc surface in the middle section can increase the heat reflection area, concentrate heat, and improve thermal efficiency. The second convex arc surface is a bulging surface, with the inner end of the second convex arc surface being slightly higher, which can concentrate the flame and improve thermal efficiency.

[0059] The support body has an internal cavity, and the mounting feet are fixed to the upper surface of the support body, separated from the bottom of the support body by the cavity. The upper and lower surfaces of the support body 23 form a two-layer pot support; a middle partition 220 is provided between the upper and lower surfaces of the support body 23, and the middle partition 220 is located between the upper and lower surfaces, forming a three-layer pot support; the two-layer or three-layer structure of the pot support can effectively avoid abnormal noises generated when burned at high temperatures.

[0060] Example 2

[0061] The number of annular flame slits in the airflow regulating flame cap 11 of this embodiment differs from that of the preferred embodiment; the rest of the structure is the same as in Embodiment 1. (See reference...) Figure 14The airflow regulating flame cover 11 is also provided with a third annular flame slit 143. The opening of the third annular flame slit 143 is opened on the flame outlet surface. The third annular flame slit 143 is axially spaced below the second annular flame slit 142. The opening of the third annular flame slit 143 faces the central cavity. The premixing cavity is connected to the first annular flame slit 141, the second annular flame slit 142 and the third annular flame slit 143 respectively through multiple flame holes 13. The depth extension line of the third annular flame slit 143 forms an angle of 30°-50° with the bottom surface of the airflow regulating flame cover 11. That is, the depth extension line of the third annular flame slit 143 forms an ε angle with the bottom surface of the airflow regulating flame cover 11. The value of the ε angle is in the range of 30°-50°. The third annular fire seam 143 is located on the inner wall of the inner side plate and distributed circumferentially along the inner side plate 19; the channel connecting the first annular fire seam 141 and the fire hole 13 is the first air passage, the channel connecting the second annular fire seam 142 and the fire hole 13 is the second air passage, and the channel connecting the third annular fire seam 143 and the fire hole 13 is the third air passage. The first air passage, the second air passage and the third air passage are respectively connected to the fire hole, and the first air passage, the second air passage and the third air passage form the fire cover air passage.

[0062] This embodiment further enhances the flame stabilization effect by setting a third annular flame slit 143 below the second annular flame slit 142. The first annular flame slit 141, the second annular flame slit 142, and the third annular flame slit 143 are arranged axially and vertically, so that the distance between the opening of each flame slit and the bottom of the pot is different. Increasing the number of gas channels allows more gas to be ejected from the third gas channel, which is located further away from the bottom of the pot. Although the increased distance between the flame and the bottom of the pot will lead to a decrease in thermal efficiency, the three-flame slit gas channel design in this embodiment increases the flame hole area and the gas output speed is slower. At the same time, the flame of the third annular flame slit 143 increases the flame root of the second annular flame slit 142, resulting in a better flame stabilization effect.

[0063] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0064] In the description of this specification, the references to terms such as "preferred embodiment," "another embodiment," "other embodiment," or "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0065] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A gas stove, characterized in that, The device includes a flame distributor, an inner flame cap, an outer flame cap, an inner ejector tube, and an outer ejector tube. The flame distributor includes a central cavity and an inner ring and an outer ring surrounding the central cavity. Each of the inner and outer rings is provided with an intake manifold connecting to the inner and outer ejector tubes, respectively. A gas buffer chamber is formed at the connection between the intake manifold and the inner or outer ring. The gas buffer chamber has an arc-shaped transition surface, which is located above the outlet of the intake manifold. Premixing chambers are formed between the inner flame cap and the inner ring, and between the outer flame cap and the outer ring, respectively. The inner flame cap and / or the outer flame cap are airflow regulating flame caps, which are provided with a first annular flame slit and a second annular flame slit spaced axially. The two annular flame seams are located on the side of the airflow regulating flame cap closest to the central cavity, which is the flame outlet surface. The openings of the first and second annular flame seams are located on the flame outlet surface, such that the openings of the first and second annular flame seams face the central cavity. The airflow regulating flame cap is provided with multiple flame holes at intervals along the circumference. The premixing chamber is connected to the first and second annular flame seams through multiple flame holes. The position on the airflow regulating flame cap corresponding to the gas buffer chamber is a throttling orifice area. The area on the airflow regulating flame cap other than the throttling orifice area is a uniform orifice area. The diameter of the flame holes on the airflow regulating flame cap located in the uniform orifice area is larger than the diameter of the flame holes on the airflow regulating flame cap located in the throttling orifice area.

2. A gas stove as described in claim 1, characterized in that, The axis of the flame hole is not parallel to the axis of the airflow regulating flame cap.

3. A gas stove as described in claim 1, characterized in that, The axis of the flame hole forms a first angle with the bottom surface of the airflow regulating flame cover, the first angle being in the range of 60°-80°; the axis of the flame hole forms a second angle with the radial line of the airflow regulating flame cover, the second angle being in the range of 20°-45°.

4. A gas stove as described in claim 1, characterized in that, The airflow regulating flame cover includes an annular top plate, an inner side plate extending radially inward from the annular top plate, and an outer side plate extending radially outward from the annular top plate. The annular top plate, the inner side plate, and the outer side plate together form part of the premixing cavity. One side wall of the inner side plate located in the premixing cavity protrudes to form an annular step. The flame hole is opened on the annular step, and the opening of the flame hole communicates with the premixing cavity.

5. A gas stove as described in claim 1, characterized in that, The end of the fire hole that is axially away from its opening is the end of the fire hole. The end of the fire hole is connected to the first annular fire seam, and the middle part between the opening and the end of the fire hole is connected to the second annular fire seam.

6. A gas stove as described in claim 1, characterized in that, The depth extension line of the first annular fire seam is not parallel to the depth extension line of the second annular fire seam. The depth extension line of the first annular fire seam forms an acute angle with the axis of the fire hole, and the depth extension line of the second annular fire seam forms an acute angle with the axis of the fire hole.

7. A gas stove as described in claim 1, characterized in that, The depth extension line of the first annular fire seam forms an angle of 40°-60° with the bottom surface of the airflow regulating flame cap, and the depth extension line of the second annular fire seam forms an angle of 30°-50° with the bottom surface of the airflow regulating flame cap.

8. A gas stove as described in claim 1, characterized in that, The gas stove also includes a pot support, which includes a support body and multiple mounting feet. The support body is in the shape of a continuous ring, and the center of the ring-shaped support body has a flame outlet area. The openings of the first and second annular flame seams are connected to the flame outlet area. There is a gap between the support body and the outer burner cap, and the flame outlet surface is not tilted relative to the axis of the airflow regulating burner cap.

9. A gas stove as described in claim 8, characterized in that, The upper surface of the bracket body is an annular inclined surface that gradually slopes downward toward the fire zone. The concavity in the middle section of the annular inclined surface causes the annular inclined surface to include a first convex arc surface, a concave arc surface, and a second convex arc surface arranged sequentially along the inner diameter toward the outer diameter of the bracket body.

10. A gas stove as described in claim 1, characterized in that, The airflow regulating flame cap is also provided with a third annular flame slit, the opening of which is located on the flame outlet surface. The third annular flame slit is axially spaced below the second annular flame slit, and its opening faces the central cavity. The premixing chamber is connected to the first annular flame slit, the second annular flame slit, and the third annular flame slit through multiple flame holes. The depth extension line of the third annular flame slit forms an angle of 30°-50° with the bottom surface of the airflow regulating flame cap.

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