A burner for a gas stove

Abstract

The present invention relates to a burner for a gas stove, the burner comprises a base; a central channel, the central channel is a cylindrical structure with an opening facing upward, and is arranged at the center of the base; an outer ring gas channel is arranged at the peripheral part of the central channel of the base, and is arranged above the outer ring gas channel and forms an outer ring gas mixing chamber, and has an outer ring fire cover of a main fire part connected with the outer ring gas mixing chamber, characterized in that it also includes a movable part arranged in the central channel and a peripheral shielding part for shielding the main fire part, the movable part can be directly triggered when a pot is placed thereon, so as to expose the main fire part. Compared with the prior art, the advantage of the present invention is that the outer ring fire can be turned off by lifting the pot, and the problem that the stove fire is still burning during the intervals of adding seasonings and plating during the cooking process is overcome, thereby achieving the purpose of saving fuel and energy.

Description

Technical Field

[0001] This invention relates to the field of gas stoves, and more specifically to a burner for a gas stove that allows you to turn off the flame by lifting the pot. Background Technology

[0002] Currently, large-scale and medium-pressure wok stoves often require turning on the gas first, then using an ignition rod or lighter to ignite the flame, and finally turning on the air supply system before cooking or stir-frying can be carried out normally. This is very inconvenient to operate. Furthermore, during the intervals between adding seasonings, plating, and repeating the operation, the flame continues to burn, resulting in a huge waste of oil and gas fuel. The air supply system also does not stop working, causing a waste of electricity. Chinese invention patent ZL200420034149.3 (publication number CN2731307Y) entitled "Fully Automatic Energy-Saving Stove" discloses a fully automatic energy-saving stove including a stove body. Its features include a control rod and a follower rod. The follower rod is placed in the stove body and can move up and down as a pot is placed or lifted on the stove body. The lower end of the follower rod is movably connected to the control rod at one end, while the other end is rotatably fixed to the stove body. When a pot is placed on the stove, the follower rod is subjected to pressure and moves downwards, causing the control rod to move downwards, thereby activating the fuel control switch, ignition control switch, and blower control switch, connecting the oil and gas fuel supply, igniting the stove, and starting the blower, thus enabling the fully automatic energy-saving stove to begin operation. When the pot is lifted, the moving rod moves upward, causing the control lever to move upward as well. This disconnects the fuel control switch, ignition control switch, and blower control switch, stopping the fully automatic energy-saving stove from operating. This achieves ignition when the pot is placed down and shutdown when the pot is lifted. The switches and ignition control switch are controlled by the up-and-down movement of the moving rod, but this method places high demands on the electrical circuitry. Summary of the Invention

[0003] The first technical problem to be solved by the present invention is to provide a burner for a gas stove that can more easily achieve the function of turning off the outer ring flame when lifting the pot, in light of the above-mentioned existing technology.

[0004] The second technical problem to be solved by the present invention is to provide a burner for a gas stove that can change the size of the inner ring flame when the pot is in use, in light of the above-mentioned existing technology.

[0005] The technical solution adopted by the present invention to solve the first technical problem mentioned above is: a burner for a gas stove, the burner comprising:

[0006] Base;

[0007] The central channel, which is an upward-opening cylindrical structure, is located at the center of the base.

[0008] The outer ring gas passage is located at the periphery of the central passage of the base;

[0009] An outer ring burner cap is disposed above the outer ring gas passage and forms an outer ring mixing chamber, having a main burner section that communicates with the outer ring mixing chamber;

[0010] Its features are:

[0011] The movable component, located in the central channel, includes an outer shielding component for blocking the main flame. In its natural state, the outer shielding component of the movable component can block the main flame, while the movable component can move when a pot is placed on it, thereby exposing the main flame.

[0012] To address the second technical problem, preferably, the central channel is connected to the inner ring injector to form a central gas channel. An inner ring burner cap covers the central gas channel. The movable component has a cavity for gas to flow into the central gas channel, and this cavity is fluidly connected to the inner ring burner cap. The wall of the movable component has at least one gas hole for gas to flow into the central gas channel. It also includes a drive rod that is elastically disposed within the cavity of the movable component. The drive rod has a shielding portion around its periphery. When the head of the drive rod is placed on a pot, it can move downwards relative to the movable component, thereby at least partially shielding the gas hole of the movable component and changing the air intake area of ​​the gas hole. This means that when the outer ring burner is opened, the inner ring burner will adaptively change its heat according to different pot shapes, ultimately preventing flame suppression and promoting more complete combustion.

[0013] From the perspective of structural simplicity, preferably, the shielding part is a cylindrical shape with openings at both the top and bottom, and the shielding part is connected to the drive rod by a connecting strip.

[0014] To further achieve gradual changes in gas flow, preferably, the shielding portion is in the shape of a trumpet that gradually narrows from top to bottom.

[0015] Furthermore, the movable component is divided into three parts from bottom to top according to the change in cross-section: a straight part adapted to the inner diameter of the central gas passage, a narrowing part, and a constricted part with an upward-facing flared opening. The tail of the drive rod is elastically located in the constricted part, and the head of the drive rod is exposed outside the inner ring burner cap. The central gas passage is provided with a fixed seat that allows the constricted part to move relative to it. When the pot is placed on the head of the drive rod, it can drive the constricted part to move downward relative to the fixed seat, thereby driving the outer shielding part to move downward, thus exposing the main burner. When the user lifts the pot, both the drive rod and the constricted part can return to their initial state, and the outer shielding part moves upward, thereby blocking the main burner.

[0016] To better achieve the effect of lifting the pot to turn off the heat, preferably, the outer shielding part of the movable part is connected to the straight part by a connecting rod. The connecting rod passes through the pipe wall of the central gas channel. Correspondingly, the pipe wall of the central gas channel has a through hole for the connecting rod to pass through. The head of the driving rod can move directly downward relative to the contraction part when the pot is placed on it, thereby driving the contraction part to move downward relative to the fixed seat, and finally driving the outer shielding part to move downward relative to the main fire part. Furthermore, the straight part of the movable part has a covering part that can always cover the through hole and remain in close proximity to the through hole.

[0017] To accommodate pots with pointed bottoms and prevent the bottom of the pot from pressing against the inner ring burner cap, preferably, the drive rod is provided with an outer sleeve. The center of the contracted portion has a limiting groove for relative movement of the outer sleeve. The outer sleeve is integrally formed with the inner ring burner cap. A first support rod is provided at the bottom of the limiting groove. A first elastic element is connected between the upper end of the first support rod and the lower end of the drive rod. The outer sleeve is fitted around the first support rod and has a gap between it and the bottom of the limiting groove. The first elastic element ensures that the head of the drive rod always tends to protrude from the top of the outer sleeve. A shielding part is provided on the outer sleeve around the drive rod. Because the bottoms of both flat-bottomed and pointed-bottomed pans are not pointed enough, when placed on the head of the drive rod, they maintain a distance from the outer sleeve from the inner ring burner cap, preventing flame suppression. When the pointed-bottomed pan is placed on the head of the drive rod, it causes the outer sleeve, inner ring burner cap, and constriction section to move downward relative to the fixed seat. As the blocking part is located on the outer sleeve, it can move downward with the outer sleeve and can only move downward with the inner ring burner cap. Ultimately, this reduces the flame area of ​​the inner ring burner cap's flame outlet and simultaneously reduces the gas intake area of ​​the gas inlet, thereby lengthening the flame length of the inner ring burner cap.

[0018] Furthermore, the bottom of the contraction section has a radially inward contraction foot, and a second elastic element is sleeved on the contraction foot. The end of the second elastic element is connected to the central channel of the fixed seat. The arrangement of the second elastic element makes the contraction section always tend to return to its original position.

[0019] Furthermore, the outer ring flame cap includes an annular component and an annular body disposed within the annular component. The annular body has a main flame section that communicates with the outer ring mixing chamber and can spray the mixed gas toward the inner ring flame cap. The annular body can be composed of at least two layers of thin sheet metal and corrugated flame cap sheets disposed between the thin sheet metal layers. Because the outer ring flame cap has this structure, the structure of the peripheral shielding component can be simplified.

[0020] Furthermore, the inner ring burner cap includes an inner ring peripheral wall and an inner ring top cover covering the inner ring peripheral wall. The inner ring peripheral wall is disposed on the central gas passage and has at least two flame outlets along the circumference, while the inner ring top cover is movable relative to the central gas passage. The inner wall of the central gas passage has a groove extending radially inward. The bottom of the groove is connected to a third elastic member, and the upper end of the third elastic member is connected to the inner ring burner cap. The third elastic member ensures that the inner ring burner cap always has a tendency to return to be flush with the top opening of the central gas passage. When the pointed pot is placed on the drive rod head, the drive rod head can retract into the outer sleeve, causing the outer sleeve, the inner ring top cover of the inner ring burner, and the retractable part to move downward relative to the fixed seat. This causes the outer shielding part to move downward, thus exposing the main flame. However, the bottom of the pointed pot always maintains a distance from the inner ring burner from the outer sleeve. The bottom of the pointed pot presses against the inner ring burner. Although the inner ring burner moves downward relative to the central gas passage, the bottom of the pointed pot always maintains a distance from the inner ring burner from the outer sleeve, preventing the bottom of the pointed pot from pressing against the inner ring burner. When the user lifts the pot, the drive rod and the retractable part can return to their initial state, and the outer shielding part moves upward, thus blocking the main flame.

[0021] In order to also achieve the anti-dry-burning function, preferably, the drive rod is a temperature sensor.

[0022] Compared with the prior art, the advantages of this invention are that when the pot is placed on the central channel, the movable part moves downward under pressure, which in turn moves the outer blocking part downward, thereby exposing the flame section for cooking. When the pot is lifted away from the central channel, the movable part moves upward again, which in turn moves the outer blocking part upward, thus closing the outer ring flame when the pot is lifted. This overcomes the problem that the flame continues to burn during the intervals of adding seasonings and plating during cooking, achieving the purpose of saving fuel and energy. When the head of the drive rod is placed on the pot, it can move downward relative to the movable part, thereby at least partially blocking the gas hole of the movable part, thereby changing the air intake area of ​​the gas hole. That is, when the outer ring flame is opened, the inner ring flame will not be suppressed, which is more conducive to complete combustion. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the burner structure in Embodiment 1 of the present invention;

[0024] Figure 2 for Figure 1 A cross-sectional view from one angle (omitting the obstructing parts and the third elastic part);

[0025] Figure 3 for Figure 1 Another sectional view from an angle (excluding obscuring parts);

[0026] Figure 4 for Figure 1 Another sectional view (omitting the obstructing parts and the third elastic element);

[0027] Figure 5 This is a schematic diagram of the moving part in Embodiment 1 of the present invention (driving rod omitted);

[0028] Figure 6 for Figure 5 sectional view of

[0029] Figure 7 This is a schematic diagram of the structure of the movable component in Embodiment 1 of the present invention;

[0030] Figure 8 for Figure 7 sectional view of

[0031] Figure 9 This is a schematic diagram of the structure of the inner ring top cover, outer sleeve and shielding component of the inner ring fire cover in Embodiment 1 of the present invention.

[0032] Figure 10 This is a cross-sectional view of the main fire part of the outer ring fire cap in Embodiment 1 of the present invention being exposed (a view of the pot being placed on a pointed bottom).

[0033] Figure 11This is a cross-sectional view of the main fire part of the outer ring fire cap in Embodiment 1 of the present invention being exposed (a view of the pot being placed over a pointed bottom).

[0034] Figure 12 This is a cross-sectional view of the burner in Embodiment 2 of the present invention from one angle. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0036] Example 1

[0037] like Figures 1-11 The following is a preferred embodiment of the present invention. The burner for a gas stove in this embodiment includes a base 1, a central gas passage 11 disposed at the center of the base 1, the central gas passage 11 being an upward-opening cylindrical structure, an inner ring burner cap 4 disposed on the central gas passage 11 and forming an inner ring mixing chamber, a movable member 3 disposed within the central gas passage 11, the movable member 3 having a cavity 321 for gas to flow into the central gas passage 11, the cavity 321 being in fluid communication with the inner ring burner cap 4, and the wall of the movable member 3 having at least one gas hole 322 for gas to flow into the central gas passage 11, and a drive rod 34 elastically disposed within the cavity 321 of the movable member 3, the drive rod 34 having a blocking portion 340 on its periphery, and being able to move downward relative to the movable member 3 when the head of the drive rod 34 is placed on a pot, thereby at least partially blocking the gas hole 322 of the movable member 3, thus changing the air intake area of ​​the gas hole 322. When the cookware is placed on the central gas channel 11, the movable part 3 moves downward under pressure, simultaneously causing the outer blocking part 3a to move downward, thereby exposing the main flame 22 for cooking. When the cookware is lifted away from the central gas channel 11, the movable part 3 moves upward again, simultaneously causing the outer blocking part 3a to move upward, thus achieving the goal of lifting the pot and closing the outer ring flame. This overcomes the problem of the stove flame continuing to burn during the intervals of adding seasonings and plating during cooking, achieving the purpose of saving fuel and energy. At the same time, the drive rod 34 is provided with a blocking part 340 on its periphery. When the head of the drive rod 34 is placed on the cookware, it can move downward relative to the movable part 3, thereby at least partially blocking the gas hole 322 of the movable part 3, thereby changing the air intake area of ​​the gas hole 322. This is especially suitable for cooking with pointed bottom pots, that is, when the outer ring flame is opened, the inner ring flame will not be suppressed, which is more conducive to complete combustion.

[0038] Specifically, in order to meet the user's cooking needs, namely having independent inner and outer ring flames, it also includes an outer ring gas passage 12 located on the periphery of the central channel of the base 1, and an outer ring flame cap 2 located on the outer ring gas passage 12 and forming an outer ring mixing chamber 21. The outer ring flame cap 2 has a main flame part 22 connected to the outer ring mixing chamber 21. The movable member 3 also includes an outer periphery shielding member 3a for shielding the main flame part 22. When the pot is placed on it, the movable member 3 can drive the outer periphery shielding member 3a to move down, thereby exposing the main flame part 22. The movable part 3 is divided into three parts from bottom to top according to the change of cross-section: a straight part 31 that matches the inner diameter of the central gas passage 11, a narrowing part 32, and a constricted part 33 with the flared opening facing upwards. The tail of the drive rod 34 is elastically located in the constricted part 33, and the head of the drive rod 34 is exposed in the inner ring burner 4. The central gas passage 11 is provided with a fixed seat 111 that allows the constricted part 33 to move relative to it. When the pot is placed on the head of the drive rod 34, it can drive the constricted part 33 to move downwards relative to the fixed seat 111, thereby driving the outer shielding part 3a to move downwards, thereby exposing the main burner 22. When the user lifts the pot, the drive rod 34 and the constricted part 33 can return to their initial state, and the outer shielding part 3a moves upwards, thereby blocking the main burner 22. To better achieve the effect of lifting the pot to turn off the heat, the outer shielding part 3a of the movable part 3 is connected to the straight part 31 by the connecting rod 50. The connecting rod 50 passes through the pipe wall of the central gas channel 11. Correspondingly, the pipe wall of the central gas channel 11 has a through hole 110 for the connecting rod 50 to pass through. The head of the driving rod 34 can move directly downward relative to the contraction part 33 when the pot is placed on it, thereby driving the contraction part 33 to move downward relative to the fixed seat 111, and finally driving the outer shielding part 3a to move downward relative to the main flame part 22. Furthermore, the straight part 31 of the movable part 3 has a covering part 311 that can always cover the through hole 110 and remain in close proximity to the through hole 110. To accommodate pots with pointed bottoms and prevent the bottom of the pot from pressing against the inner ring burner cap 4, an outer sleeve 5 is provided around the drive rod 34. The center of the contraction section 33 has a limiting groove 331 for relative movement of the outer sleeve 5. The outer sleeve 5 is integrally formed with the inner ring burner cap 4. A first support rod 6 is provided at the bottom of the limiting groove 331. A first elastic element 7 is connected between the upper end of the first support rod 6 and the lower end of the drive rod 34. The outer sleeve 5 is fitted around the first support rod 6 and has a gap between it and the bottom of the limiting groove 331. The first elastic element 7 ensures that the head of the drive rod 34 always tends to protrude from the top of the outer sleeve 5.The outer sleeve 5 can hold the bottom of the pointed pot against it, preventing the bottom of the pointed pot from getting too close to the inner ring burner cap 4. When the pot is placed on the head of the drive rod 34, the head of the drive rod 34 can retract into the outer sleeve 5, and at the same time, it can drive the shrinking part 33 to move downward relative to the fixed seat 111, thereby driving the outer shielding member 3a to move downward, thus exposing the main flame part 22. However, the bottom of the pointed pot always maintains a distance of the outer sleeve 5 from the inner ring burner cap 4. The bottom of the pointed pot presses against the inner ring burner cap 4. When the user lifts the pot, both the drive rod 34 and the shrinking part 33 can return to their initial state, and the outer shielding member 3a moves upward, thereby blocking the main flame part 22. In addition, the bottom of the shrinking part 33 has a radially inward shrinking foot 332. A second elastic member 8 is fitted on the shrinking foot 332. The end of the second elastic member 8 is connected to the central pipe of the fixed seat 111. The setting of the second elastic member 8 makes the shrinking part 33 always tend to return to its original position. The outer ring flame cap 2 of this embodiment includes an annular component 23 and an annular body 24 disposed within the annular component 23. The annular body 24 has a main flame section 22 that communicates with the outer ring mixing chamber 21 and can spray the mixed gas toward the inner ring flame cap 4. The annular body 24 can be composed of at least two layers of thin sheet metal and corrugated flame cap sheets disposed between the thin sheet metal. Because the outer ring flame cap 2 has this structure, the structure of the peripheral shielding member 3a can be simplified. Finally, to better accommodate the pointed bottom of the pot, the inner ring burner cap 4 includes an inner ring peripheral wall 4c and an inner ring top cap 4d covering the inner ring peripheral wall 4c. The inner ring peripheral wall 4c is disposed on the central gas passage 11 and has at least two flame outlets 41c along the circumference. The inner ring top cap 4d can move relative to the central gas passage 11. The inner wall of the central gas passage 11 has a groove 112 extending radially inward. The bottom of the groove 112 is connected to a third elastic member 9. The upper end of the third elastic member 9 is connected to the inner ring top cap 4d of the inner ring burner cap 4. The third elastic member 9 makes the inner ring top cap 4d of the inner ring burner cap 4 always tend to return to be flush with the top opening of the central gas passage 11. When the cookware is placed on the head of the drive rod 34, the head of the drive rod 34 can retract into the outer sleeve 5, and drive the outer sleeve 5, the inner ring top cover 4d of the inner ring burner 4, and the shrinking part 33 to move downward relative to the fixed seat 111, thereby driving the outer shielding part 3a to move downward, thus exposing the main flame part 22. However, the bottom of the pointed pot always maintains a distance of the outer sleeve 5 from the inner ring top cover 4d of the inner ring burner 4. The bottom of the pointed pot presses against the inner ring top cover 4d of the inner ring burner 4. Although the inner ring burner 4 moves downward relative to the central gas passage 11, the bottom of the pointed pot always maintains a distance of the outer sleeve 5 from the inner ring top cover 4d of the inner ring burner 4, avoiding the bottom of the pointed pot pressing against the inner ring top cover 4d of the inner ring burner 4. When the user lifts the cookware, the drive rod 34 and the shrinking part 33 can return to their initial state, and the outer shielding part 3a moves upward, thereby blocking the main flame part 22.Specifically, the shielding part 340 is a cylindrical shape with openings at both the top and bottom. The shielding part 340 is connected to the drive rod 34 via a connecting strip 3400. The central gas passage 11 also has a shielding part 340. When the head of the drive rod 34 is placed on a pot, it can move downwards relative to the movable part 3, thereby at least partially shielding the gas hole 322 of the movable part 3. This changes the air intake area of ​​the gas hole 322, ensuring that the inner ring flame is not suppressed when the outer ring flame is opened, thus promoting more complete combustion. The elastic coefficient of the second elastic member 8 is much smaller than that of the first elastic member 7, ensuring that the main flame section 22 of the outer ring flame cap 2 opens first after the pot is placed on it. In this example, the maximum deformation of the second elastic member 8 is the total height of the main flame section 22 of the outer ring flame cap 2. When the movement of the drive rod 34 exceeds the movement of the main flame section 22 of the outer ring flame cap 2, the first elastic member 7 provides buffering. The maximum deformation of the first elastic member 7 is the height of the drive rod 34 above the outer sleeve 5 plus the deformation of the third elastic member 9. The three springs, namely the first elastic element 7, the second elastic element 8, and the third elastic element 9, move in the following order: the second elastic element 8 is first compressed to its limit position (flat-bottomed pan resting state), then the first elastic element 7 is compressed (pointed pan resting state), and finally, the first elastic element 7, the second elastic element 8, and the third elastic element 9 are compressed together (pointed-bottomed pan resting state); the height of the outer sleeve 5 is preferably 7-14mm, and the drive rod 34 is >10mm higher than the highest surface of the pan support.

[0039] In summary, this burner adapts to three different pot types during use, resulting in the following three situations:

[0040] a. Frying pan: When the frying pan is placed on the head of the drive rod 34, it can drive the shrinking part 33 to move down relative to the fixed seat 111, thereby driving the outer shielding part 3a to move down, thereby exposing the main fire part 22. At this time, the second elastic member 8 is compressed.

[0041] b. Pointed-bottom pot: Since the outer tube 5 can hold the bottom of the pointed pot, it prevents the bottom of the pointed pot from being too close to the inner ring top cover 4d of the inner ring fire cover 4. When the pointed-bottom pot is placed on the head of the drive rod 34, it can drive the shrinking part 33 to move down relative to the fixed seat 111 (at this time, the second elastic member 8 is compressed) and at the same time drive the outer shielding member 3a to move down, thereby exposing the main fire part 22. In addition, since the bottom of the pointed-bottom pot is more pointed than the flat-bottom pot, the bottom of the pointed-bottom pot can cause the head of the drive rod 34 to retract into the outer tube 5 (at this time, the first elastic member 7 is compressed). However, the bottom of the pointed pot always maintains the distance of the outer tube 5 from the inner ring top cover 4d of the inner ring fire cover 4. The bottom of the pointed pot presses against the inner ring top cover 4d of the inner ring fire cover 4. When the user lifts the pot, the drive rod 34 and the shrinking part 33 can return to their initial state, and the outer shielding member 3a moves up, thereby blocking the main fire part 22.

[0042] c. Over the pointed-bottom pot: When the pointed-bottom pot is placed on the head of the drive rod 34, the head of the drive rod 34 can retract into the outer sleeve 5 (at this time, the first elastic element 7 is compressed), and drive the outer sleeve 5, the inner ring top cover 4d of the inner ring burner cover 4, and the contraction part 33 to move downward relative to the fixed seat 111 (at this time, the second elastic element 8 and the third elastic element 9 are compressed), thereby driving the outer shielding part 3a to move downward, thus exposing the main flame part 22. At the same time, the outer periphery of the drive rod 34 is provided with a shielding part 340, which can move downward relative to the movable part 3 when the head of the drive rod 34 is placed on the pot, thereby at least partially shielding the movable part 3. The gas inlet 322 is adjusted to change its air intake area, but the bottom of the pointed-bottom pot always maintains a distance of the outer tube 5 from the inner ring top cover 4d of the inner ring burner cap 4. Although the inner ring top cover 4d of the inner ring burner cap 4 moves downward relative to the central gas passage 11, the bottom of the pointed-bottom pot always maintains a distance of the outer tube 5 from the inner ring top cover 4d of the inner ring burner cap 4, preventing the bottom of the pointed-bottom pot from pressing against the inner ring top cover 4d of the inner ring burner cap 4. When the user lifts the pot, both the drive rod 34 and the retractable part 33 can return to their initial state, and the outer shielding part 3a moves upward, thereby blocking the main burner 22, ultimately achieving the purpose of turning off the outer ring burner when the pot is lifted. In addition, the shielding part 340 provided on the outer tube 5 is provided on the outer tube 5. Because the bottoms of both the flat-bottomed pan and the pointed-bottomed pan are not pointed enough, when they are placed on the head of the drive rod 34, they can maintain a distance from the outer sleeve 5 with respect to the inner ring top cover 4d of the inner ring burner cap 4, thus avoiding smothering the flame. However, when the pointed-bottomed pan is placed on the head of the drive rod 34, it can cause the outer sleeve 5, the inner ring top cover 4d of the inner ring burner cap 4, and the contraction part 33 to move downward relative to the fixing seat 111. Therefore, since the blocking part 340 is set on the outer sleeve 5, it can maintain a distance from the outer sleeve 5 with respect to the inner ring burner cap 4. The inner ring burner cap 4 and the inner ring top cap 4d of the inner ring burner cap 4 move downwards together. This reduces the flame area of ​​the flame outlet 41c of the inner ring peripheral wall 4c of the inner ring burner cap 4, and consequently reduces the air intake area of ​​the gas inlet 322. This lengthens the flame length of the flame outlet 41c of the inner ring peripheral wall 4c of the inner ring burner cap 4. In this embodiment, the shielding part 340 is a cylindrical shape with openings at both the top and bottom. The shielding part 340 is connected to the drive rod 34 by a connecting strip 3400. To further ensure safety, this embodiment preferably uses a primary air premixed burner or an electronically controlled valve body to ensure that gas does not leak when the main flame section 22 of the outer ring burner cap 2 is shielded.

[0043] Example 2

[0044] The structure is basically the same as in Embodiment 1, with the only difference being that the shielding part 340 is a trumpet shape that gradually narrows from top to bottom. This allows the outer sleeve 5, the inner ring top cover 4d of the inner ring burner cap 4, and the contraction part 33 to move downward relative to the fixed seat 111 when the pointed bottom pot is placed on the head of the drive rod 34. Since the shielding part 340 is located on the outer sleeve 5, it can move downward together with the outer sleeve 5. Simultaneously, the inner ring top cover 4d of the inner ring burner cap 4 also moves downward. Ultimately, this reduces the flame area of ​​the flame outlet 41c of the inner ring peripheral wall 4c of the inner ring burner cap 4, thereby reducing the air intake area of ​​the gas inlet 322 and lengthening the flame length of the flame outlet 41c of the inner ring burner cap 4. Furthermore, because the shielding part 340 gradually narrows from top to bottom... The gradually narrowing trumpet shape ensures that the flame length of the flame outlet 41c of the inner ring burner cap 4 remains adaptively constant as the outer casing 5 moves downward. That is, the greater the downward movement of the inner ring top cap 4d and the outer casing 5 together, the less flame can be emitted from the inner ring burner cap, and the correspondingly smaller air intake area of ​​the gas port 322. This prevents the flame length from decreasing excessively, maintaining a consistent flame length when the downward movement of the inner ring top cap 4d and the outer casing 5 is small. In other words, the smaller the downward movement of the inner ring top cap 4d and the outer casing 5 together, the more flame can be emitted from the inner ring burner cap, and the larger the air intake area of ​​the gas port 322 (e.g., ...). Figure 12 (As shown).

Claims

1. A burner for a gas stove, the burner comprising: Base (1); A central channel, which is a cylindrical structure with an opening facing upward and is arranged at the center of the base (1); An outer ring gas channel (12) is arranged at the outer periphery of the central channel of the base (1); An outer ring fire cover (2) is arranged on the outer ring gas channel (12) and forms an outer ring gas mixing chamber, and has a main fire part (22) connected to the outer ring gas mixing chamber (21); Features: The movable member (3) is arranged in the central channel and comprises a peripheral shielding member (3a) for shielding the main fire part (22). In a natural state, the peripheral shielding member (3a) of the movable member (3) can shield the main fire part (22), and the movable member (3) can move when a pot is placed thereon, thereby exposing the main fire part (22); The central channel can be connected to the inner ring ejector tube to form a central gas channel (11); the central gas channel (11) is covered with an inner ring fire cover (4); the movable part (3) has a cavity (321) for the gas in the central gas channel (11) to flow in; the cavity (321) is fluidically connected to the inner ring fire cover (4); the wall of the movable part (3) has at least one gas hole (322) for the gas in the central gas channel (11) to flow in; and the movable part (3) also includes a driving rod (34) that can be elastically arranged in the cavity (321) of the movable part (3); a shielding part (340) is arranged on the periphery of the driving rod (34); when the head of the driving rod (34) is placed on the cookware, the driving rod (34) can move downward relative to the movable part (3), thereby at least partially shielding the gas hole (322) of the movable part (3), thereby changing the gas intake area of ​​the gas hole (322); The shielding portion (340) is in the shape of a tube with openings at the top and bottom, and the shielding portion (340) is connected to the driving rod (34) via a connecting strip (3400); The shielding portion (340) is in the shape of a trumpet that gradually tapers from top to bottom; The movable part (3) is divided into three parts from bottom to top according to the change of the cross section: a straight part (31) adapted to the inner diameter of the central gas channel (11), a narrowed part (32) and a contraction part (33) with a bell mouth facing upwards, the tail of the driving rod (34) is elastically located in the contraction part (33), the head of the driving rod (34) is exposed outside the inner ring fire cover (4), and the central gas channel (11) is provided with a fixed seat (111) capable of allowing the contraction part (33) to move relative to it.

2. The burner for a gas stove according to claim 1, characterized in that: The peripheral shielding member (3a) of the movable member (3) is connected to the straight portion (31) via a connecting rod (50), and the connecting rod (50) passes through the tube wall of the central gas channel (11). Correspondingly, the tube wall of the central gas channel (11) has a through hole (110) for the connecting rod (50) to pass through. The head of the driving rod (34) can directly move downward relative to the contraction portion (33) when the cookware is placed thereon, and then drive the contraction portion (33) to move downward relative to the fixed seat (111), and finally drive the peripheral shielding member (3a) to move downward relative to the main fire portion (22), and the straight portion (31) of the movable member (3) has a covering portion (311) that can always cover the through hole (110) and maintain a close proximity to the through hole (110).

3. The burner for a gas stove according to claim 2, characterized in that: An outer sleeve (5) is arranged on the periphery of the driving rod (34), and a limiting groove (331) is provided in the center of the contraction portion (33) for relative movement of the outer sleeve (5). The outer sleeve (5) is integrally arranged with the inner ring fire cover (4), and a first supporting rod (6) is arranged at the bottom of the limiting groove (331). A first elastic member (7) is connected between the upper end of the first supporting rod (6) and the lower end of the driving rod (34). The outer sleeve (5) is sleeved on the periphery of the first supporting rod (6) and has a gap between the bottom of the limiting groove (331). The setting of the first elastic member (7) enables the head of the driving rod (34) to always have a tendency to be exposed at the top of the outer sleeve (5).

4. The burner for a gas stove according to claim 3, characterized in that: The bottom of the contraction portion (33) has a contraction foot (332) that contracts inwardly in the radial direction, and a second elastic member (8) is sleeved on the contraction foot (332). The end of the second elastic member (8) is connected to the central pipe of the fixing seat (111). The arrangement of the second elastic member (8) enables the contraction portion (33) to always have a tendency to return to its original position.

5. The burner for a gas stove according to any one of claims 1 to 4, characterized in that: The outer ring fire cover (2) comprises an annular component (23) and an annular body (24) arranged in the annular component (23); the annular body (24) has a main fire part (22) which is connected to the outer ring gas mixing chamber (21) and can spray mixed gas toward the inner ring fire cover (4).

6. The burner for a gas stove according to claim 5, characterized in that: The inner ring fire cover (4) comprises an inner ring circumferential wall (4c) and an inner ring top cover (4d) arranged on the inner ring circumferential wall (4c); the inner ring circumferential wall (4c) is arranged on the central gas channel (11) and has at least two fire outlets (41c) along the circumferential direction; the inner ring top cover (4d) can move relative to the central gas channel (11); the inner wall of the central gas channel (11) has a groove (112) extending radially inward; the bottom of the groove (112) is connected to a third elastic member (9); the upper end of the third elastic member (9) is connected to the inner ring fire cover (4); the third elastic member (9) enables the inner ring fire cover (4) to always have a tendency to return to be flush with the top opening of the central gas channel (11).

7. The burner for a gas stove according to claim 6, characterized in that: The driving rod (34) is a temperature sensor.

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