Down draft double tube burner

Abstract

The technical scheme belongs to the technical field of cooking stove burners, and particularly relates to a lower air inlet double-tube burner, which comprises a base, a flame sparger arranged on the base, and a combustion disc arranged on the flame sparger, the combustion disc comprises an outer fire cover and an inner fire cover, the base is provided with two air inlet channels which are respectively connected to the outer fire cover and the inner fire cover, each air inlet channel comprises a gas inlet for providing gas, an air inlet for providing air, and a gas mixing cavity, an outer mounting cavity is arranged in the air inlet channel connected to the outer fire cover, the outer mounting cavity is splitly provided with an outer ejector pipe, the outer ejector pipe has an outer mixing channel, the outer mixing channel is respectively connected to the gas mixing cavity and the outer fire cover at two ends, and the outer ejector pipe is axially adjusted relative to the outer mounting cavity; and / or the air inlet channel connected to the inner fire cover is provided with an inner mounting cavity, the inner mounting cavity is splitly provided with an inner ejector pipe, the inner ejector pipe has an inner mixing channel, one end of the inner mixing channel is connected to the gas mixing cavity, and the other end of the inner mixing channel is connected to the inner fire cover, and the inner ejector pipe can be axially adjusted relative to the inner mounting cavity.

Description

Technical Field

[0001] This technical solution relates to the field of stove burner technology, specifically a bottom-inlet dual-tube burner. Background Technology

[0002] A stove burner is a device that sprays fuel and air in a certain way to mix and burn. It is a key component of a stove, responsible for mixing gas and air and igniting them to produce a flame for heating. Existing burners are generally divided into top-intake burners or burners and stoves. The characteristic of burners and stoves is that the air required for combustion enters the burner from below the chassis and mixes with the gas.

[0003] For example, Chinese patent CN108087876A discloses a double-ring burner for a stove, including a burner head, an inner burner cap, an outer burner cap, an ignition needle, and an induction needle. The burner head includes a burner head body, an inner ejector tube, and an outer ejector tube. The burner head body includes a hollow, bottom-opening column, an inner annular gas chamber, and an outer annular gas chamber surrounding the column. The inner and outer ejector tubes communicate with the inner and outer annular gas chambers, respectively. The interface of the outer burner cap is inserted into the inner annular gas chamber of the burner head body. The upper end of the outer annular wall plate of the inner annular gas chamber supports the lower end of the inner annular wall plate, and the upper end of the outer annular wall plate of the outer annular gas chamber supports a circular seat plate. The lower end face of the cylindrical part of the inner burner cap is supported and fitted with an inverted frustum-shaped top plate.

[0004] The inner and outer injection tubes of the above-mentioned burner both adopt a Venturi structure. The main principle of the Venturi structure is to use the structure of the inner wall of the pipe to first contract and then gradually expand, so as to generate negative pressure near the high-speed flowing gas, thereby effectively adsorbing air and increasing the mixing ratio of oxygen and gas.

[0005] The existing burner head base and inner and outer injection tubes are all integrally molded structures. The outer and inner injection tubes have different injection capabilities for different gas sources, but they cannot adjust the gas-air mixing ratio to a suitable range according to each gas source, resulting in inconsistent combustion effects. When using the same gas source, the outer and inner injection tubes have different gas-air mixing ratios, and the combustion cannot achieve the optimal effect, which needs to be further improved. Summary of the Invention

[0006] This technical solution addresses the problem that dual-ejector tubes cannot adjust the gas-air mixing ratio, resulting in suboptimal combustion. It provides a bottom-inlet dual-tube burner.

[0007] The purpose of this technical solution is achieved as follows:

[0008] A bottom-inlet dual-tube burner includes a base, a burner mounted on the base, and a combustion plate mounted on the burner. The combustion plate includes an outer burner cap and an inner burner cap. The base has two air inlet channels respectively connected to the outer burner cap and the inner burner cap. Each air inlet channel includes a gas inlet for supplying fuel gas, an air inlet for supplying air, and a mixing chamber. The burner is characterized by:

[0009] An external mounting cavity is also provided in the air intake channel connected to the outer flame cap. An external ejector tube is separately provided in the external mounting cavity. The external ejector tube has a mixing channel. One end of the mixing channel is connected to the mixing cavity and the other end is connected to the outer flame cap. The external ejector tube can be axially adjusted relative to the external mounting cavity.

[0010] and / or

[0011] An inner mounting cavity is also provided in the air intake channel connected to the inner flame cap. An inner ejector tube is separately provided in the inner mounting cavity. The inner ejector tube has a mixing channel. One end of the mixing channel is connected to the mixing cavity and the other end is connected to the inner flame cap. The inner ejector tube can be axially adjusted relative to the inner mounting cavity.

[0012] Through the above technical solution, a bottom-inlet dual-tube burner, under normal use, has two independent air intake channels set in the base. Gas and air enter the mixing chamber through the gas inlet and air inlet respectively for initial mixing. Then, secondary mixing is performed by the mixing channel of the split-type ejector tube and delivered to the combustion plate. By axially adjusting the ejector tubes in the outer and / or inner air intake channels, the fixed position of the outer and / or inner ejector tubes in the mounting cavity is changed. When the ejector tubes are adjusted to move closer to the corresponding gas inlet, the distance between the ejector tube and the gas inlet is shortened, reducing the amount of air that can be carried by the gas inlet with the same gas input, thus lowering the air ratio. This is suitable for gas types with low air consumption per unit volume; conversely, it is suitable for gas types with high air consumption per unit volume. It can adjust the gas-air ratio in the corresponding mixing chamber. The outer and / or inner ejector tubes can be dynamically adjusted according to different gas source characteristics, improving the adaptability of adjustment and ensuring sufficient mixing efficiency of gas and air, thereby improving the combustion stability of the outer and / or inner burner caps and optimizing the combustion effect.

[0013] Preferably, the cross-sectional areas of the gas inlet and the mixing chamber are both greater than or equal to the cross-sectional areas of the corresponding outer mounting cavity and the inner mounting cavity, and are aligned so that the outer ejector tube and the inner ejector tube can be installed into the outer mounting cavity and the inner mounting cavity respectively after passing through the corresponding gas inlet and the mixing chamber.

[0014] With the above technical solution, the gas inlet and the mixing chamber are aligned with the corresponding installation chamber, so that the three form a through channel. Since the cross-sectional area of ​​the gas inlet and the mixing chamber is larger than the cross-sectional area of ​​the corresponding installation chamber, the inner and outer ejector tubes extend from the corresponding gas inlet into the mixing chamber, and then enter the installation chamber from the mixing chamber to complete the installation of the inner and outer ejector tubes, thus improving convenience.

[0015] Preferably, the base has a connecting hole, and a fastener is connected to the connecting hole. The outer ejector tube and the inner ejector tube are respectively fixed to the corresponding outer mounting cavity and inner mounting cavity by the fastener.

[0016] The above technical solution involves tightening the fastener by rotating it through the connection hole, allowing it to move downwards along the connection hole until the lower end of the fastener abuts against the side wall of the ejector tube. This further tightens the ejector tube, restricting its movement. When the position of the ejector tube needs to be adjusted, the fastener is loosened again to release the ejector tube, at which point the ejector tube can be pulled out of the installation cavity. This makes the adjustment of the inner and outer ejector tubes convenient, and facilitates replacement and maintenance.

[0017] Preferably, the outer mounting cavity and the inner mounting cavity are arranged obliquely within the base, such that the outlet ends of the outer ejector tube and the inner ejector tube are both higher than the inlet ends, and the inlet ends extend to the corresponding mixing chambers.

[0018] Through the above technical solution, the inclined outer and inner mounting cavities allow the corresponding outer and inner ejector tubes installed inside to also be inclined, so that the conduction direction of the two corresponding mixing channels is inclined. The tilt design improves the adaptability and ejection performance of the ejector tubes.

[0019] Preferably, the diameter and length of the inner ejector tube are both smaller than those of the outer ejector tube.

[0020] Through the above technical solution, staged mixing control is achieved by differentiating the structure of the outer ejector tube and the inner ejector tube. The inner ejector tube has a smaller diameter and length than the outer ejector tube. Due to its compact size, the flow rate of the mixed gas is increased and the kinetic energy is enhanced, making it suitable for high-precision adjustment of small flow rate in the inner ring. The outer ejector tube, on the other hand, increases the mixing time and space through its large diameter and long stroke, adapting to the high flow rate combustion requirements of the outer ring and improving the overall thermal efficiency and operating condition adaptability of the burner.

[0021] Preferably, both the outer ejector tube and the inner ejector tube have textured ends.

[0022] The above technical solution involves designing textured sections at the ends of the outer and inner ejector tubes to enhance their contact friction with the mounting cavity or external adjustment tools (or manually), providing a stable gripping point and ensuring precise control of the insertion depth and position of the ejector tube during manual or tool operation, thereby improving the convenience and reliability of adjustment operations.

[0023] Preferably, an internal air inlet is formed between the base and the flamethrower, the internal air inlet leading to the inner flame cap and used to supply air.

[0024] By using the above technical solution, multiple internal air inlets are evenly distributed circumferentially between the base and the flamethrower, providing additional air supply to the combustion area of ​​the inner flame cap. This ensures that the air supplied to the inner flame cap is more sufficient, allowing the combustion gas to be fully burned and enhancing the combustion stability of the inner flame cap.

[0025] Preferably, the air inlet includes an air inlet communicating with the mixing chamber, and the air inlet extends to the side of the base;

[0026] The base is also provided with an opening that connects to the gas mixing chamber. The opening is located on the side of the base near the flamethrower. The flamethrower has a groove formed corresponding to the opening. When the flamethrower is installed with the base, the gas mixing chamber and the groove are spliced ​​together.

[0027] Through the above technical solution, the air inlet and the mixing chamber are connected. Since the air inlet is located on the lower end face and side of the base, there is enough space between the air inlet and the stove panel after the base is installed to allow for air circulation, so that the amount of air that can enter the mixing chamber from the outside is sufficient. When it is necessary to test the airtightness or the condition of the gas nozzle, the burner can be removed and the opening opened, so that the internal condition of the mixing chamber can be directly observed through the opening without removing the entire base. The position of the injector tube can also be adjusted through the opening, making maintenance and testing simpler and more efficient.

[0028] Preferably, the base is equipped with a nozzle holder, which has two nozzles, each of which is embedded in a corresponding gas inlet for inputting gas.

[0029] The above technical solution integrates a dual-nozzle structure through a nozzle mounting base installed on the base. The two nozzles are precisely embedded in the gas inlets of the outer and inner air intake channels, respectively, to achieve directional gas input. The embedded cooperation between the nozzles and the gas inlets reduces the risk of gas leakage and improves gas utilization.

[0030] Preferably, the outer flame cap has a plurality of outer flame holes, and the outer flame holes are inclined outward and upward at an angle of 5°-15° relative to the outer flame cap;

[0031] The inner flame cover has several inner main flame holes and inner flame stabilizing holes, and each inner flame stabilizing hole is distributed one-to-one between two adjacent inner main flame holes;

[0032] The inner main flame hole is inclined outward and upward relative to the inner flame cap at an angle of 5°-15°. The inclination angle of the inner flame stabilizing hole is smaller than that of the inner main flame hole, and the inclination angle of the inner flame stabilizing hole is 2°-8°.

[0033] Through the above technical solution, the outer flame holes are arranged circumferentially on the outer flame cover to make the flame more uniform and stable, thereby improving the cooking effect. An inner flame stabilizing hole is added between every two horizontally adjacent inner main flame holes, so that several inner main flame holes and several inner flame stabilizing holes are arranged sequentially and alternately along the circumferential direction, which helps to achieve a more uniform flame distribution and improve the thermal efficiency of the burner.

[0034] The tilt angle of the outer flame hole and the inner main flame hole is limited to the range of 5°-15°, so that both the outer and inner flame holes emit flame at an upward angle, making the inner main flame hole more stable and more complete. The tilt angle of the inner flame stabilizer hole is within the range of 2°-8°. The upward angle setting of the flame stabilizer hole further enhances the stability of the main flame, thereby improving the combustion stability.

[0035] The key and beneficial technical effects of this technical solution compared to existing technologies are:

[0036] 1. This technical solution allows for axial adjustment of the ejector tube relative to the mounting cavity, which is used to adjust the ratio of fuel gas to air in the mixing chamber. It is suitable for different types of fuel gas with different air consumption per unit volume. The inner ejector tube and / or outer ejector tube can adjust the mixing ratio of fuel gas and air to achieve more complete combustion and optimize combustion effect.

[0037] 2. This technical solution has a matching ejector tube installed in the mounting cavity. The ejector tube and the base are separate, which makes it easy to process the ejector tube separately and then install it, thus achieving better processing accuracy. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the overall structure of this embodiment;

[0039] Figure 2 This is one of the partial cross-sectional views along the external ejector tube in this embodiment;

[0040] Figure 3 This is the second partial cross-sectional view along the inner ejector tube in this embodiment;

[0041] Figure 4 This is a partial explosion diagram of this embodiment;

[0042] Figure 5 This embodiment Figure 4 Another perspective illustration;

[0043] Figure 6 This is a partial exploded view of the central base.

[0044] Reference numerals: 1. Base; 2. Flamethrower; 3. Combustion disc; 31. Outer flame cap; 32. Inner flame cap; 41. Outer mounting cavity; 42. Inner mounting cavity; 51. Outer mixing channel; 52. Inner mixing channel; 6. Air intake channel; 61. Outer air intake channel; 62. Inner air intake channel; 7. Connecting hole; 8. Fastener; 91. Outer ejector tube; 92. Inner ejector tube; 10. Textured part; 11. Mixing chamber; 12. Air inlet; 13. Inner air inlet; 14. Opening; 15. Groove; 16. Nozzle holder; 17. Nozzle; 18. Gas inlet; 19. Outer flame hole; 20. Inner main flame hole; 21. Inner flame stabilizer hole. Detailed Implementation

[0045] The specific implementation of this technical solution will be further described in detail below with reference to the accompanying drawings.

[0046] Example:

[0047] See Figure 1 A burner includes a base 1, a flamethrower 2, and a combustion plate 3. The base 1 can be installed on the stove panel, the flamethrower 2 is fixed above the base 1, and the combustion plate 3 is installed on the side of the flamethrower 2 away from the base 1. Two internal air inlets 13 are formed between the base 1 and the flamethrower 2. The internal air inlets 13 are used to supply air to the inner burner cap 32 from the outside. The supplemented air makes the mixture burn completely and improves the combustion efficiency.

[0048] The combustion plate 3 includes an outer flame cover 31 and an inner flame cover 32. The outer flame cover 31 is located in a ring shape outside the inner flame cover 32. The diameter of the outer flame cover 31 is preferably 128 mm, so that the flame is focused and the heat is diffused at the bottom. The outer flame cover 31 has an outer flame hole 19, which is evenly spaced along the circumference of the outer flame cover 31. Each outer flame hole 19 is inclined relative to the outer flame cover 31 along the through direction. The end with the higher inclination position is inclined outward away from the inner flame cover 32, and the end with the lower inclination position is inclined towards the inner flame cover 32, so that the flame outlet of each outer flame hole 19 emits flame at an upward angle and the flame spreads outward. The inclination angle of the outer flame hole 19 is in the range of a, a = 5°-15°. In this example, the inclination angle of the outer flame hole 19 is preferably 10°.

[0049] The inner flame cover 32 has several inner main flame holes 20 and several inner flame stabilizing holes 21. The inner main flame holes 20 and inner flame stabilizing holes 21 are alternately distributed circumferentially along the inner flame cover 32, so that each inner flame stabilizing hole 21 is distributed one-to-one between two adjacent inner main flame holes 20, forming an alternating layout. The axis of each inner main flame hole 20 and inner flame stabilizing hole 21 along the through direction is inclined relative to the inner flame cover 32, and the inclined direction is outward towards the position of the outer flame cover 31, so as to emit flame at an upward angle. Among them, the inner flame cover 32 has several inner main flame holes 20 and several inner flame stabilizing holes 21. The tilt angle of the flame stabilizer hole 21 is smaller than that of the inner main burner hole 20. The tilt angle of the inner main burner hole 20 is in the range of b, where b = 5°-15°. In this example, the tilt angle of the inner main burner hole 20 is preferably 10°. The tilt angle of the inner flame stabilizer hole 21 is in the range of c, where c = 2°-8°. In this example, the tilt angle of the inner flame stabilizer hole 21 is preferably 5°. With the inner main burner hole 20 tilted at 10° and the inner flame stabilizer hole 21 tilted at 5°, the inner main burner hole 20 becomes more stable.

[0050] See Figure 2 , Figure 3 and Figure 5 The base 1 is provided with two air intake channels 6 connected to the flamethrower 2. The two air intake channels 6 are an outer air intake channel 61 connected to the outer flame cap 31 and an inner air intake channel 62 connected to the inner flame cap 32. The outer air intake channel 61 and the inner air intake channel 62 are similar in structure and independent of each other. Each air intake channel 6 includes a gas inlet 18 for providing gas, an air inlet for providing air, and a mixing chamber 11. The base 1 is equipped with a nozzle fixing seat 16, which has two nozzles 17. The nozzle fixing seat 16 is aligned with the two gas inlets 18 and fixed with bolts. The two nozzles 17 are respectively embedded into the two gas inlets 18. The two nozzles 17 input two streams of gas from the same gas source into the two gas inlets 18. Alternatively, the two nozzles 17 input gas from two different gas sources into the two gas inlets 18.

[0051] The air inlet includes an air inlet 12 that connects to the mixing chamber 11. The air inlet 12 is located on the lower end face of the base 1 and extends to the side of the base 1 to avoid obstruction when multiple bases 1 are arranged for use. It is connected to the corresponding mixing chamber 11. The air inlet 12 replenishes the air mixed with the gas. When the gas is input, the gas carries the air passing through the air inlet 12.

[0052] Each air intake channel 6 is also provided with an installation cavity, which includes an outer installation cavity 41 provided in the outer air intake channel 61 and an inner installation cavity 42 provided in the inner air intake channel 62. The outer installation cavity 41 and the inner installation cavity 42 are both arranged at an inclination in the base 1, and one end of them is connected to the front end of the corresponding mixing chamber 11. An ejector tube is separately provided in the outer installation cavity 41 and / or the inner installation cavity 42. In this embodiment, it is shown that the outer installation cavity 41 and the inner installation cavity 42 are respectively provided with an outer ejector tube 91 and an inner ejector tube 92. The ejector tube includes an outer ejector tube 91 and an inner ejector tube 92. The shape and size of each ejector tube are adapted to the corresponding installation cavity. Based on the inclination of the installation cavity, the inclination angle is preferably 3°, so that the outlet end of the mixing channel 5 in each ejector tube is higher than the inlet end, and the inlet end extends to the mixing chamber 11.

[0053] The diameter and length of the inner ejector tube 92 are both smaller than those of the outer ejector tube 91; the cross-sectional areas of the gas inlet and the mixing chamber are both greater than or equal to the cross-sectional areas of the corresponding outer mounting chamber 41 and the inner mounting chamber 42, and are aligned so that the outer ejector tube 91 and the inner ejector tube 92 can pass through the corresponding gas inlet and the mixing chamber in one go and then be installed into the outer mounting chamber 41 and the inner mounting chamber 42 respectively.

[0054] The outer ejector tube 91 has an outer mixing channel 51, one end of which is connected to the corresponding mixing chamber 11 and the other end of which is connected to the outer burner cap 31. The inner ejector tube 92 has an inner mixing channel 52, one end of which is connected to the corresponding mixing chamber 11 and the other end of which is connected to the inner burner cap 32. In this embodiment, the ejector tube adopts a Venturi structure. The Venturi tube is existing technology and will not be described in detail here. This structure effectively increases the negative pressure of the air and improves the mixing ratio of air and fuel gas, so that both the outer and inner mixing channels include a Venturi structure along their length. The ejector tube comprises a contraction section, a guide section, and a diffuser section. The guide section connects the contraction section and the diffuser section. After the ejector tube is installed, the contraction section is located at the end of the ejector tube near the mixing chamber 11, and its channel cross-section is gradually narrowed towards the guide section to guide the mixed gas. The diffuser section is located at the end of the guide section away from the contraction section, and it is flared outward away from the guide section. The expansion angle of the diffuser section of the outer mixing channel 51 in the outer ejector tube 91 is preferably 3.9°, and the expansion angle of the diffuser section of the inner mixing channel 52 in the inner ejector tube 92 is preferably 2.2°.

[0055] See Figure 4 , Figure 5 and Figure 6 Both the outer ejector tube 91 and the inner ejector tube 92 have a textured portion 10, which is formed on the outer peripheral wall of the end of the corresponding ejector tube. The textured portion 10 is formed by a series of protrusions or grooves 15, which have a large frictional force. After the ejector tube is installed, the textured portion 10 is located at the end of the corresponding ejector tube near the mixing chamber 11. Applying force to the textured portion 10 improves the ease of pulling out the ejector tube.

[0056] The base 1 has two connecting holes 7. One end of each connecting hole 7 extends to the upper surface of the base 1, and the other end extends downward to the side wall of each of the two mounting cavities 4. Each connecting hole 7 is connected to a fastener 8, preferably a fastening screw. The fastener 8 is threaded into the connecting hole 7. By rotating the fastener 8, its position in the connecting hole 7 can be adjusted. The fastener 8 moves downward and presses against the outer wall of the ejector tube, so that the ejector tube is relatively fixed in position within the mounting cavity 4.

[0057] The outer ejector tube 91 and the inner ejector tube 92 are axially adjustable relative to their respective outer mounting cavities 41 and inner mounting cavities 42. When the adjusting fastener 8 releases the outer and inner ejector tubes, the fixed position of the ejector tubes in their respective mounting cavities is adjusted, thereby adjusting the ratio of gas and air in the mixing chamber 11. When the ejector tube is pulled out toward the gas inlet 18, the distance between the ejector tube and the gas inlet 18 is shortened, resulting in a reduction in the amount of air that the gas inlet 18 can carry when the same amount of gas is input, and a decrease in the air ratio. This is suitable for gas types with low air consumption per unit volume. Conversely, when the distance between the ejector tube and the gas inlet 18 is extended, the amount of air that the gas inlet 18 can carry when the same amount of gas is input is increased, and an increase in the air ratio. This is suitable for gas types with high air consumption per unit volume, resulting in better mixing of different gas and air ratios, more complete fuel combustion, and improved applicability.

[0058] The base 1 is also provided with an opening 14 that connects to the mixing chamber 11. The opening 14 is located on the upper end face of the base 1. The two openings 14 are connected to the two mixing chambers 11 in a one-to-one correspondence. The flamethrower 2 has a groove 15 formed corresponding to the opening 14. The two grooves 15 are connected to the two openings 14 in a one-to-one correspondence. When the flamethrower 2 is installed with the base 1, the mixing chamber 11 and the groove 15 are connected in a corresponding manner and are connected through the two openings 14. By removing the flamethrower 2 and opening the opening 14, it is convenient to adjust the position of the ejector tube through the opening 14.

[0059] The specific work process of this plan is as follows:

[0060] This technical solution involves setting two independent air intake channels 6 within the base 1. Gas and air enter the mixing chamber 11 through the gas inlet 18 and air inlet 12 respectively for initial mixing. Then, secondary mixing is performed by the mixing channel 5 of the split-type ejector tube and the mixture is delivered to the combustion plate 3. The outer ejector tube 91 and / or the outer ejector tube 91 are axially adjusted to change their relative positions in the outer mounting cavity 41 and inner mounting cavity 42. When the corresponding ejector tube is adjusted to move closer to the gas inlet 18, the distance between the ejector tube and the gas inlet 18 is shortened, thus... When the gas inlet 18 is used for the same amount of gas input, the amount of air it can carry is reduced, and the air ratio is lowered. This is suitable for gas types that consume less air per unit volume. Conversely, it is suitable for gas types that consume more air per unit volume. By controlling the ratio of gas to air intake in the mixing chamber 11, the air-fuel ratio is dynamically optimized for different gas source characteristics. The dual-channel structure, combined with the adjustable ejector tube design, allows the inner ejector tube 92 and / or the outer ejector tube 91 to adjust the mixing ratio of gas and air, thereby achieving more complete combustion of fuel and optimizing combustion performance.

[0061] The foregoing has shown and described the basic principles, main features, and advantages of this technical solution. Those skilled in the art should understand that this technical solution is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this technical solution. Various changes and modifications can be made to this technical solution without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed technical solution. The scope of protection of this technical solution is defined by the appended claims and their equivalents.

Claims

1. A bottom-inlet dual-tube burner, comprising a base (1), a flamethrower (2) disposed on the base (1), and a combustion plate (3) disposed on the flamethrower (2), wherein the combustion plate (3) comprises an outer flame cap (31) and an inner flame cap (32), and the base (1) is provided with two air inlet channels (6) respectively connected to the outer flame cap (31) and the inner flame cap (32), wherein each air inlet channel (6) comprises a gas inlet for supplying fuel gas, an air inlet for supplying air, and a mixing chamber, characterized in that: An external mounting cavity (41) is also provided in the air intake channel (6) connected to the outer flame cap (31). An external ejector tube (91) is separately provided in the external mounting cavity (41). The external ejector tube (91) has an external mixing channel (51). One end of the external mixing channel (51) is connected to the corresponding mixing cavity, and the other end is connected to the outer flame cap (31). The external ejector tube (91) can be axially adjusted relative to the external mounting cavity (41). and / or An inner mounting cavity (42) is also provided in the air intake channel (6) connected to the inner flame cap (32). An inner ejector tube (92) is separately provided in the inner mounting cavity (42). The inner ejector tube (92) has an inner mixing channel (52). One end of the inner mixing channel (51) is connected to the corresponding mixing chamber and the other end is connected to the inner flame cap (32). The inner ejector tube (92) can be axially adjusted relative to the inner mounting cavity (42).

2. The bottom-inlet dual-tube burner according to claim 1, characterized in that: The cross-sectional areas of the gas inlet and the mixing chamber are both greater than or equal to the cross-sectional areas of the corresponding outer mounting cavity (41) and inner mounting cavity (42) and are aligned, so that the outer ejector tube (91) and the inner ejector tube (92) can be installed into the outer mounting cavity (41) and the inner mounting cavity (42) respectively after passing through the corresponding gas inlet and the mixing chamber.

3. A bottom-inlet dual-tube burner according to claim 1, characterized in that: The base (1) has a connection hole (7), and a fastener (8) is connected to the connection hole (7). The outer ejector tube (91) and the inner ejector tube (92) are respectively fixed to the corresponding outer mounting cavity (41) and inner mounting cavity (42) by the fastener (8).

4. A bottom-inlet dual-tube burner according to claim 1, characterized in that: The outer mounting cavity (41) and the inner mounting cavity (42) are arranged obliquely in the base (1), such that the outlet ends of the outer ejector tube (91) and the inner ejector tube (92) are higher than the inlet ends, and the inlet ends extend to the corresponding mixing chambers.

5. A bottom-inlet dual-tube burner according to claim 1, characterized in that: The diameter and length of the inner ejector tube (92) are both smaller than those of the outer ejector tube (91).

6. A bottom-inlet dual-tube burner according to claim 1, characterized in that: Both the outer ejector tube (91) and the inner ejector tube (92) have textured portions (10) at their ends.

7. A bottom-inlet dual-tube burner according to claim 1, characterized in that: An internal air inlet (13) is formed between the base (1) and the flamethrower (2), the internal air inlet (13) leading to the inner flame cap (32) and used to supply air.

8. A bottom-inlet dual-tube burner according to claim 1, characterized in that: The air inlet includes an air inlet (12) that communicates with the mixing chamber (11), and the air inlet (12) extends to the side of the base (1); The base (1) is also provided with an opening (14) that connects to the mixing chamber (11). The opening (14) is located on the side of the base (1) near the flamethrower (2). The flamethrower (2) has a groove (15) formed corresponding to the opening (14). When the flamethrower (2) is installed with the base (1), the mixing chamber (11) and the groove (15) are spliced ​​together.

9. A bottom-inlet dual-tube burner according to claim 1, characterized in that: The base (1) is equipped with a nozzle holder (16), which has two nozzles (17). The two nozzles (17) are respectively embedded in the corresponding gas inlet (18) for inputting gas.

10. A bottom-inlet dual-tube burner according to claim 1, characterized in that: The outer flame cap (31) has a plurality of outer flame holes (19), and the outer flame holes (19) are inclined outward relative to the outer flame cap (31) at an angle of 5°-15°. The inner flame cap (32) has a plurality of inner main flame holes (20) and inner flame stabilizing holes (21), and each inner flame stabilizing hole (21) is distributed one-to-one between two adjacent inner main flame holes (20); The inner main flame hole (20) is inclined outward and upward relative to the inner flame cover (32) at an angle of 5°-15°. The inclination angle of the inner flame stabilizing hole (21) is smaller than that of the inner main flame hole (20), and the inclination angle of the inner flame stabilizing hole (21) is 2°-8°.

Images