Ejecting pipe and combustor with same

Abstract

The utility model provides an ejector pipe and a burner with the same, and belongs to the technical field of gas stoves, the ejector pipe comprises an ejector pipe body and a gas mixing structure connected to the ejector pipe body, the gas mixing structure comprises at least one premixing cavity, and the gas passing area of the premixing cavity is increased firstly and then reduced in the gas flow direction. According to the injection pipe, fuel gas and air can be fully premixed in the injection pipe, the problems that pressure in a fire distributor is not uniform, flame length is not uniform, heating is not uniform and the like are solved, and the combustion performance, stability and user experience of a product are improved.

Description

Technical Field

[0001] This utility model relates to the field of gas stove technology, and in particular to an ejector tube and a burner having the same. Background Technology

[0002] After the gas passes through the injector and mixes briefly, it enters the burner and the flame spreader for combustion. Because the gas passes through the injector for a short time, the gas and air mix for a short time. If the gas enters the burner before it is fully mixed, problems such as uneven pressure in the burner chamber, uneven flame length, and uneven heating will occur, affecting the user's cooking experience. Utility Model Content

[0003] The first technical problem to be solved by this utility model is to address the problems of the prior art by providing an injector that allows the gas and air to be fully premixed in the injector, avoiding problems such as uneven pressure, flame length and uneven heating in the burner, thereby improving the combustion performance, stability and user experience of the product.

[0004] The second technical problem to be solved by this invention is to provide a burner for use in the ejector tube.

[0005] The technical solution adopted by this utility model to solve the first technical problem mentioned above is: an ejector tube, the ejector tube including an ejector tube body and a gas mixing structure connected to the ejector tube body, wherein the gas mixing structure includes at least one premixing chamber, and the gas passage area of ​​the premixing chamber first increases and then decreases along the gas flow direction.

[0006] According to one embodiment of the present invention, the ejector tube body includes, in sequence along the airflow direction, a contraction section, a straight section, an expansion section, and a transition section. One end of the transition section is connected to the expansion section, and the other end extends upward and is connected to the fire distributor.

[0007] According to one embodiment of the present invention, each of the premixed cavities is connected between the straight segment and the expansion segment.

[0008] According to one embodiment of the present invention, each of the premixed chambers is connected to the outlet end of the expansion section.

[0009] According to one embodiment of the present invention, the number of premixing chambers is greater than or equal to two, wherein a portion of the premixing chambers are connected between the straight section and the expansion section, and the other portion of the premixing chambers are connected to the air outlet of the expansion section.

[0010] According to one embodiment of the present invention, the number of premixing cavities is greater than or equal to two, and a cylindrical connecting cavity is connected between two adjacent premixing cavities located on the same side of the expansion section.

[0011] According to one embodiment of the present invention, the transition section includes an arc-shaped pipe section and a vertical pipe section, the air inlet end of the arc-shaped pipe section is connected to the air outlet end of the expansion section, and the vertical pipe section is connected to the air outlet end of the arc-shaped pipe section and extends upward.

[0012] The technical solution adopted by this utility model to solve the second technical problem mentioned above is: a burner, the burner comprising:

[0013] As described in any of the preceding items, ejector tube;

[0014] A flame divider is disposed above the ejector tube and includes a mixing chamber corresponding to the ejector tube.

[0015] A flame cover is placed on top of the gas mixing chamber.

[0016] According to one embodiment of the present invention, the mixing chamber includes an outer ring wall, an inner ring wall, and a bottom wall connecting the outer ring wall and the inner ring wall. The bottom wall has an air inlet hole, and the outer side of the top of the burner cap has an air outlet hole. The inner ring wall has a guide slope that slopes from bottom to top towards the air outlet hole on the side near the air inlet hole.

[0017] According to one embodiment of the present invention, the inner ring wall is provided with an arc-shaped groove corresponding to the air inlet on the side near the air inlet, and the top of the arc-shaped groove is connected to the guide slope.

[0018] According to one embodiment of the present invention, the burner further includes:

[0019] The mounting bracket is connected to the side of the ejector tube body near its outlet end and has a limiting hole corresponding to the ejector tube body.

[0020] A sleeve is connected between the air inlet and the limiting hole, and the ejector tube and the fire distributor can be connected through the mounting bracket and the sleeve.

[0021] According to one embodiment of the present invention, the top surface of the mounting bracket is recessed downward to form a mounting groove, the bottom of the mounting groove is provided with the limiting hole, the sleeve is inserted into and connected to the mounting groove, and the ejector tube body is inserted into and connected to the limiting hole.

[0022] According to one embodiment of the present invention, the ejector tube body is provided with a first annular protrusion on the side near its outlet end, and the sleeve is provided with a second annular protrusion on the end near the ejector tube body. The second annular protrusion is engaged with the mounting groove. When the ejector tube body is inserted into the limiting hole to a preset position, the first annular protrusion abuts against the outside of the bottom of the mounting groove.

[0023] Compared with the prior art, the present invention has the following advantages or beneficial effects:

[0024] This invention, through the premixing chamber, allows the gas and air to be fully premixed in the injector tube, avoiding problems such as uneven pressure, flame length, and uneven heating in the igniter, thereby improving the combustion performance, stability, and user experience of the product. Attached Figure Description

[0025] The above and other features and advantages of this invention will become more apparent from a detailed description of exemplary embodiments with reference to the accompanying drawings.

[0026] Figure 1 This is a first schematic diagram of an ejector tube according to an exemplary embodiment.

[0027] Figure 2 This is a second schematic diagram of an ejector tube according to an exemplary embodiment.

[0028] Figure 3 This is a third schematic diagram of an ejector tube according to an exemplary embodiment.

[0029] Figure 4 This is a fourth schematic diagram of an ejector tube according to an exemplary embodiment.

[0030] Figure 5 This is a fifth schematic diagram of an ejector tube according to an exemplary embodiment.

[0031] Figure 6 This is a perspective view of a burner according to an exemplary embodiment.

[0032] Figure 7 This is a cross-sectional view of a burner according to an exemplary embodiment.

[0033] Figure 8 This is a top view of a burner according to an exemplary embodiment.

[0034] Figure 9 This is a schematic diagram of a fire distributor according to an exemplary embodiment.

[0035] Figure 10 This is a cross-sectional view of a fire distributor according to an exemplary embodiment.

[0036] Figure 11 This is a schematic diagram of a mounting bracket according to an exemplary embodiment.

[0037] 1. Ejector tube body; 10. Gas mixing structure; 101. Premixing chamber; 102. Cylindrical connecting chamber; 11. Contraction section; 12. Straight section; 13. Expansion section; 14. Transition section; 141. Arc-shaped pipe section; 142. Vertical pipe section; 15. First annular bulge;

[0038] 2. Flame distributor; 20. Mixing chamber; 201. Outer ring wall; 202. Inner ring wall; 203. Bottom wall; 2020. Guide slope; 2021. Arc groove; 21. Air inlet; 211. Limiting groove;

[0039] 3. Flame cap; 31. Vent hole;

[0040] 4. Mounting bracket; 40. Limiting hole; 41. Mounting groove; 42. Mounting hole;

[0041] 5. Sleeve; 51. Second annular convex bulge;

[0042] 6. Air distribution baffle;

[0043] 7. Ignition needle bracket. Detailed Implementation

[0044] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed description will be omitted.

[0045] The terms “a,” “one,” “the,” and “” are used to indicate the existence of one or more elements / components / etc.; the terms “include” and “have” are used to indicate an open-ended meaning of inclusion and that there may be other elements / components / etc. in addition to the listed elements / components / etc.

[0046] This utility model embodiment provides an ejector tube, such as Figure 1-5As shown, the ejector tube includes an ejector tube body 1 and a mixing structure 10 connected to the ejector tube body 1. The mixing structure 10 includes at least one premixing chamber 101, the air passage area of ​​which first increases and then decreases along the airflow direction. The mixing structure 10 in this application is used to fully premix the gas and air entering the ejector tube, thus avoiding uneven gas output, flame length, and heating caused by uneven pressure inside the burner 2, thereby improving combustion performance. Furthermore, as the air passage area of ​​the premixing chamber 101 increases, the airflow velocity decreases, during which the airflow is fully mixed; as the airflow continues to advance, the air passage area gradually decreases, at which point the mixed airflow can be accelerated, ensuring the airflow velocity and ejection effect. Therefore, this application, through the premixing chamber, not only allows for more complete premixing and combustion of the gas, but also ensures the ejection effect, improves product stability, and provides a better user experience.

[0047] In a preferred embodiment of this utility model, such as Figure 1-5 The ejector body 1 shown includes, in sequence along the airflow direction, a contraction section 11, a straight section 12, an expansion section 13, and a transition section 14. One end of the transition section 14 is connected to the expansion section 13, and the other end extends upward and connects to the burner 2. The central axes of the contraction section 11, straight section 12, and expansion section 13 extend horizontally. The transition section 14 connects the expansion section 13 and the burner 2, enabling the gas delivered by the expansion section 13 to be smoothly guided into the vertically positioned burner 2 without minimizing loss of airflow velocity, thereby improving gas delivery efficiency and ensuring the burner's gas demand.

[0048] Preferably, the cone apex angle of the expansion section 13, which is the included angle between the two sidewalls on the axial tangential plane of the expansion section 13, is α, where 7°≤α≤9.5°. Within this range, better ejection capability can be obtained. Furthermore, in this embodiment, the outer diameter of the air inlet end of the contraction section 11 is 39 mm, and the length of the straight section 12 is 40 mm.

[0049] In a preferred embodiment of this utility model, such as Figure 2 , 3 As shown in Figure 5, each premixing chamber 101 is connected between the straight section 12 and the expansion section 13. Figure 2 The illustration shows a case where one premixing chamber 101 is set between the straight section 12 and the expansion section 13, so that the gas is fully mixed in the premixing chamber 101. Of course, two, three, four, five or even more can be set as needed, as long as the gas can be mixed evenly and the gas entrainment effect is guaranteed. This application does not impose any restrictions.

[0050] In a preferred embodiment of this utility model, such as Figure 1As shown, each premixing chamber 101 is connected to the outlet end of the expansion section 13. That is, after passing through the contraction section 11, the straight section 12 and the expansion section 13, the gas enters the premixing chamber 101. In the premixing chamber 101, the gas is first decelerated and mixed, and then accelerated before entering the transition section 14, which ensures the gas delivery speed, improves the gas mixing effect and enhances combustion performance. Figure 1 The illustration shows a case with one premixing chamber 101. As needed, two, three, four, five or even more chambers can be set, as long as the gas can be mixed evenly and the gas entrainment effect can be guaranteed. This application does not impose any restrictions.

[0051] In a preferred embodiment of this utility model, such as Figure 4 As shown, there are two or more premixing chambers 101. One portion of the premixing chambers 101 are connected between the straight section 12 and the expansion section 13, while the other portion are connected to the outlet of the expansion section 13. When there are two or more premixing chambers 101, they can be arranged on the left and right sides of the expansion section 13. This means that after passing through the contraction section 11 and the straight section 12, the gas enters the premixing chamber 101 located on the right side of the expansion section 13 for the first premixing, and then enters the premixing chamber 101 located on the left side of the expansion section 13 for the second premixing. This ensures thorough mixing of the fuel gas and air, improving combustion efficiency and user experience.

[0052] In a preferred embodiment of this utility model, such as Figure 5 As shown, there are two or more premixing chambers 101, and a cylindrical connecting chamber 102 connects two adjacent premixing chambers 101 located on the same side of the expansion section 13. The cylindrical connecting chamber 102 functions similarly to the straight section 12 of the ejector tube, accelerating the gas in the two adjacent premixing chambers 101 and increasing the flow rate of the ejector gas. For ease of description... Figure 5 As shown in the example, the gas enters the first mixing chamber 101 on the right after passing through the contraction section 11 and the straight section 12. After the flow area increases and then decreases, it enters the cylindrical connecting chamber 102 for further acceleration, and then enters the second mixing chamber 101 on the right for thorough mixing. This ensures the gas flow rate and improves the mixing effect.

[0053] In a preferred embodiment of this utility model, such as Figure 1-5 The transition section 14 shown includes an arc-shaped pipe section 141 and a vertical pipe section 142. The air inlet end of the arc-shaped pipe section 141 is connected to the air outlet end of the expansion section 13, and the vertical pipe section 142 is connected to the air outlet end of the arc-shaped pipe section 141 and extends upward. Figure 1-5 As shown, the transition section 114 can smoothly guide the horizontally extending airflow into the vertical direction, and can also maintain the ejector tube's good ejection capability, thereby improving the product's combustion performance.

[0054] In summary, the air inlet and / or outlet of the expansion section 13 of this application are connected to a mixing structure 10. The mixing structure 10 includes at least one premixing chamber 101, and the air passage area of ​​the premixing chamber 101 first increases and then decreases along the airflow direction. The mixing structure 10 can be arranged as follows: Figure 1 The outlet end of the expansion section 13 shown can also be set as follows: Figure 2 , 3 The air intake end of the expansion section 13 shown in Figure 5, namely the straight section 12 and the expansion section 13; when there are two or more premixing chambers 101, such as Figure 4 As shown, premixing chambers 101 can also be partially disposed on both sides of expansion section 13 to ensure that the gas can be fully mixed in the ejector tube, improve burner performance, and avoid uneven gas output caused by uneven pressure inside the flame distributor 2. At the same time, the different positions of premixing chambers 101 on the ejector body 1 will also affect the ejector gas flow rate.

[0055] This utility model embodiment provides a burner, such as Figure 7-11 The burner shown includes: the aforementioned injector, a flame spreader 2, and a flame cap 3. The flame spreader 2 includes a mixing chamber 20 corresponding to the injector. The flame spreader 2 is positioned above the injector, and the flame cap 3 covers the top of the mixing chamber 20. Because the injector has a mixing structure 10, it can fully premix the gas and air entering the injector, avoiding uneven pressure inside the flame spreader 2 due to uneven mixing. Furthermore, the flame spreader 2 can remix the air and gas entering its chamber before discharging it through the flame cap 3. Since the gas is fully mixed sequentially in the injector and flame spreader 2, the gas distribution is uniform, improving the product's combustion performance, product stability, and user experience.

[0056] In addition, the exhaust area of ​​the distributor 2 is 430-550 mm. 2 Between, preferably 450mm 2 To ensure the uniformity of gas output from the burner 2, this application also installs a gas distribution baffle 6 inside the burner 2. The gas distribution baffle 6 is fixed to the top of the burner 2 with screws. The installation height of the gas distribution baffle 6 in the burner 2 is 7.5mm. The gas distribution baffle 6 is located between the air inlet 21 and the air outlet 31. Preferably, the gas distribution baffle 6 is located below the axial projection of the air outlet 31 to divert the gas flow, making the gas output of the burner 2 more uniform and improving the thermal efficiency of the burner.

[0057] In a preferred embodiment of this utility model, such as Figure 7-11The mixing chamber 20 shown includes an outer ring wall 201, an inner ring wall 202, and a bottom wall 203 connecting the outer ring wall 201 and the inner ring wall 202. The bottom wall 203 has an air inlet 21, and the outer top of the burner cap 3 has an air outlet 31. The inner ring wall 202, near the air inlet 21, has a guide slope 2020 that slopes upwards towards the air outlet 31. In this embodiment, the guide slope 2020 guides the gas entering the igniter 2, causing it to rise rapidly to the air outlet 31, thus quickly guiding the gas entering the mixing chamber 20 towards the air outlet 31 and accelerating ignition.

[0058] Preferably, the projection of the air outlet 31 onto the plane where the air outlet end of the air inlet 21 is located does not intersect with the air outlet end face of the air inlet 21, in order to ensure that there is no air outlet 31 directly above the air inlet 21 and to ensure the uniformity of the gas output from the burner.

[0059] In a preferred embodiment of this utility model, such as Figure 9-10 The inner ring wall 202 shown has an arc-shaped groove 2021 corresponding to the air inlet 21 on the side near the air inlet 21. The top of the arc-shaped groove 2021 is connected to the guide slope 2020. In this embodiment, since the ejector tube 11 is directly connected to the igniter 2, the diameter of the air inlet 21 is made larger in order to increase the gas supply from the ejector tube 11 to the igniter 2. In order to avoid the inner ring wall 202 affecting the air intake speed, an arc-shaped groove 2021 is opened in the inner ring wall 202. The inner circumferential surface of the arc-shaped groove 2021 is coplanar with the outer circumferential surface of the air inlet 21. The guide slope 2020 is used to guide the gas entering the arc-shaped groove 2021, so that the gas entering the mixing chamber 20 is quickly guided to the air outlet 31, accelerating the gas output and achieving rapid ignition.

[0060] In a preferred embodiment of this utility model, such as Figure 9-10 The burner shown also includes a mounting bracket 4 and a sleeve 5. The mounting bracket 4 is connected to the side of the ejector tube body 1 near its outlet end and has a limiting hole 40 corresponding to the ejector tube body 1. The sleeve 5 connects the air inlet 21 and the limiting hole 40. The ejector tube and the igniter 2 can be connected through the mounting bracket 4 and the sleeve 5. The limiting structure 41 and the sleeve 5 can quickly fix the ejector assembly 1 and the igniter 2, simplifying the assembly process. It can also effectively ensure the installation dimensions of the ejector tube 11 and the igniter 2, solve the problem of air leakage due to structural fit caused by the manufacturing process, and improve the safety performance and assembly efficiency of the product.

[0061] Preferred, such as Figure 10The air inlet end of the air inlet 21 extends towards the sleeve 5, ensuring that the mating depth between the air inlet 21 and the sleeve 21 is not less than 7mm. The inner wall of the air inlet 21 has a limiting groove 211 for installing the sleeve 5. The sleeve 5 can be inserted into the limiting groove 211, with the top of the sleeve 5 and the bottom of the limiting groove 211 tightly fitted. The inner circumferential surface of the sleeve 5 is coplanar with the inner circumferential surface of the air inlet 21. The sleeve 5 can seal the connection between the ejector tube 11 and the ignition distributor 2. By controlling the mating depth between the sleeve 5 and the ignition distributor 2, the sealing performance between the ejector tube 11 and the ignition distributor 2 can be effectively enhanced, preventing air leakage due to excessive clearance or manufacturing processes, thus improving product safety.

[0062] In a preferred embodiment of this utility model, such as Figure 6-8 As shown in Figure 11, the top surface of the mounting bracket 4 is recessed downwards to form a mounting groove 41. A limiting hole 40 is provided at the bottom of the mounting groove 41. The sleeve 5 is inserted into and connected to the mounting groove 41, and the ejector tube body 1 is inserted into and connected to the limiting hole 40. The mounting groove 41 and the sleeve 5 are interference-fitted, and the ejector tube 11 and the limiting hole 40 are interference-fitted. The connection structure of the ejector tube 11, the mounting bracket 4, and the sleeve 5 can be realized by inserting the sleeve 5 into the mounting groove 41 and the ejector tube 11 into the limiting hole 40. The structure is simple and the operation is convenient. Only by setting the mounting groove 41 and the limiting hole 40 in the mounting bracket 4 can the ejector tube 11 and the sleeve 5 be aligned and assembled. The structure is simple, easy to process, and easy to assemble.

[0063] like Figure 6-8 As shown in Figure 11, there is at least one ejector tube 11 and a corresponding limiting hole 40. Figure 11The shown limiting holes 40 are two in number. In some embodiments, there can be one, three, four, five, six, or even more, depending on the number of ejector tubes 11. Since the air inlet ends of multiple ejector tubes 11 are fixed and kept on the same plane by the ejector tube end face bracket, the distance 'a' between the centers of the air inlet ends of two adjacent ejector tubes 11 is equal to the distance 'a' between the centers of the centers of the two adjacent limiting holes 40 in the X direction, and the distance 'b' between the centers of the air outlet ends of two adjacent ejector tubes 11 is equal to the distance 'b' between the centers of the centers of the two adjacent limiting holes 40 in the Y direction. In this embodiment, the distance between the centers of the air inlet ends of two adjacent ejector tubes 11 is 40mm, that is, a = 40mm, and the length difference between two adjacent ejector tubes 11 is 20mm. Taking two ejector tubes 11 as an example, the length difference between the ejector tube 11 located in the outer ring and the ejector tube 11 located in the inner ring is greater than or equal to 20mm, which can improve the ejection performance of the outer ring and improve thermal efficiency. In this embodiment, the length is the distance of the ejector tube 11 projected in the Y direction. Thus, the distance between the centers of two adjacent limiting holes 40 can be calculated from the outer diameter of the ejector tube 11 or the diameter of the limiting hole 40. Therefore, the assembly dimensions and position of the ejector tube 11 can be limited and the assembly dimensions of the inner and outer ejector tubes 11 can be controlled by the size and position of the limiting holes 40. By controlling the positions of different limiting holes 40 on the mounting bracket 4, the assembly dimensions of the inner and outer ejector tubes 11 can be guaranteed. During the burner assembly process, only two limiting holes 40 and the mounting bracket 4 that meet the design requirements need to be selected to control the ejector tube assembly dimensions.

[0064] Preferably, the burner further includes an ignition needle assembly, which includes an ignition needle bracket 7, an ignition needle, and a flameout protection device. The bottoms of the ignition needle and the flameout protection device are connected to the ignition needle bracket 7. The ignition needle bracket 7 is fixed to the mounting bracket 4 with screws. The mounting bracket 4 also has mounting holes 42 for mounting the ignition needle assembly. Figure 7 As shown, the mounting holes 42 are two, which can be used to install the ignition needle and the flameout protection device respectively. The distance between the ignition needle and the flameout protection device and the burner cap 3 can be effectively controlled through the two mounting holes 42, so as to ensure the assembly effect of the ignition needle assembly and the burner cap 3.

[0065] In a preferred embodiment of this utility model, such as Figure 7 The ejector tube body 1 shown has a first annular protrusion 15 near its outlet end, and a second annular protrusion 51 near the end of the sleeve 5 near the ejector tube body 1. The second annular protrusion 51 engages with the mounting groove 41. When the ejector tube body 1 is inserted into the limiting hole 40 to the preset position, the first annular protrusion 15 abuts against the outer side of the bottom of the mounting groove 41. The first annular protrusion 15 and the second annular protrusion 51 simultaneously press the mounting bracket 4 from the upper and lower sides, respectively, thus completing the assembly of the ejector tube 11, the sleeve 5, and the mounting bracket 4. The assembly structure is simple.

[0066] In this embodiment of the invention, the term "multiple" refers to two or more, unless otherwise explicitly defined. The terms "install," "connect," and "fix" should be interpreted broadly. For example, "connect" can mean a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention based on the specific circumstances.

[0067] In the description of the embodiments of this utility model, it should be understood that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific direction or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0068] In the description of this specification, the terms "an embodiment," "a preferred embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. 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 any suitable manner in one or more embodiments or examples.

[0069] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An ejector tube, characterized in that, It includes an ejector tube body (1) and a gas mixing structure (10) connected to the ejector tube body (1), wherein the gas mixing structure (10) includes at least one premixing chamber (101), and the gas passage area of ​​the premixing chamber (101) first increases and then decreases along the gas flow direction.

2. The ejector tube according to claim 1, characterized in that, The ejector tube body (1) includes, in sequence along the airflow direction, a contraction section (11), a straight section (12), an expansion section (13), and a transition section (14). One end of the transition section (14) is connected to the expansion section (13), and the other end extends upward and is connected to the fire distributor (2).

3. The ejector tube according to claim 2, characterized in that, Each of the premixed chambers (101) is connected between the straight section (12) and the expansion section (13).

4. The ejector tube according to claim 2, characterized in that, Each of the premixed chambers (101) is connected to the outlet of the expansion section (13).

5. The ejector tube according to claim 2, characterized in that, The number of premixing chambers (101) is greater than or equal to two, wherein a portion of the premixing chambers (101) are connected between the straight section (12) and the expansion section (13), and the other portion of the premixing chambers (101) are connected to the air outlet of the expansion section (13).

6. The ejector tube according to claim 2, characterized in that, The number of the premixing chambers (101) is greater than or equal to two, and a cylindrical connecting chamber (102) is connected between two adjacent premixing chambers (101) located on the same side of the expansion section (13).

7. The ejector tube according to claim 6, characterized in that, The transition section (14) includes an arc-shaped pipe section (141) and a vertical pipe section (142). The air inlet end of the arc-shaped pipe section (141) is connected to the air outlet end of the expansion section (13), and the vertical pipe section (142) is connected to the air outlet end of the arc-shaped pipe section (141) and extends upward.

8. A burner, characterized in that, include: The ejector tube as described in any one of claims 1-7; The fire distributor (2) is located above the ejector tube and includes a mixing chamber (20) corresponding to the ejector tube. The fire cover (3) is placed on the top of the gas mixing chamber (20).

9. The burner according to claim 8, characterized in that, The mixing chamber (20) includes an outer ring wall (201), an inner ring wall (202), and a bottom wall (203) connecting the outer ring wall (201) and the inner ring wall (202). The bottom wall (203) has an air inlet (21), and the outer side of the top of the flame cap (3) has an air outlet (31). The inner ring wall (202) has a guide slope (2020) that is inclined from bottom to top towards the air outlet (31) on the side near the air inlet (21).

10. The burner according to claim 9, characterized in that, The inner ring wall (202) has an arc-shaped groove (2021) corresponding to the air inlet (21) on the side near the air inlet (21), and the top of the arc-shaped groove (2021) is connected to the guide slope (2020).

11. The burner according to claim 9, characterized in that, Also includes: The mounting bracket (4) is connected to the side of the ejector tube body (1) near its outlet end and has a limiting hole (40) corresponding to the ejector tube body (1). The sleeve (5) is connected between the air inlet (21) and the limiting hole (40). The connection between the ejector tube and the fire distributor (2) can be realized through the mounting bracket (4) and the sleeve (5).

12. The burner according to claim 11, characterized in that, The top surface of the mounting bracket (4) is recessed downward to form a mounting groove (41), and the bottom of the mounting groove (41) is provided with the limiting hole (40). The sleeve (5) is inserted into and connected to the mounting groove (41), and the ejector tube body (1) is inserted into and connected to the limiting hole (40).

13. The burner according to claim 12, characterized in that, The ejector tube body (1) has a first annular protrusion (15) on one side near its outlet end, and the sleeve (5) has a second annular protrusion (51) on one end near the ejector tube body (1). The second annular protrusion (51) and the mounting groove (41) are engaged. When the ejector tube body (1) is inserted into the limiting hole (40) to the preset position, the first annular protrusion (15) abuts against the outside of the bottom of the mounting groove (41).

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