Ejecting pipe and combustor with same

Abstract

The invention provides an injection pipe and a combustor with the injection pipe, and belongs to the technical field of gas stoves, the injection pipe comprises an injection pipe body and a gas mixing structure connected to the injection pipe body, the gas mixing structure comprises at least one premixing cavity, and the gas passing area of the premixing cavities is increased firstly and then decreased in the gas flow direction. According to the injection pipe, fuel gas and air can be fully premixed in the injection pipe, the problems of non-uniform pressure, non-uniform flame length, non-uniform heating and the like in a fire distributor are solved, and the combustion performance, stability and user experience of a product are improved.

Description

Technical Field

[0001] The invention relates to the technical field of gas stoves, and in particular to an ejector tube and a burner having the same. Background Art

[0002] After the gas is briefly mixed through the ejector tube, it enters the ignition divider and fire cover for combustion. Since the gas passes through the ejector tube for a short time and the gas and air mix for a short time, it enters the ignition divider without being fully mixed. This will cause problems such as uneven pressure in the ignition divider cavity, uneven flame length and heating, affecting the user's cooking experience. Summary of the invention

[0003] The first technical problem to be solved by the present invention is to provide an ejector tube that can fully premix the gas and air in the ejector tube, avoid problems such as uneven pressure, flame length and uneven heating in the ignition divider, and improve the combustion performance, stability and user experience of the product.

[0004] The second technical problem to be solved by the present invention is to provide a burner applied to the ejector tube.

[0005] The technical solution adopted by the present invention to solve the above-mentioned first technical problem is: an ejector tube, the ejector tube includes 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 flow area of ​​the premixing chamber first increases and then decreases along the air flow direction.

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

[0007] According to an embodiment of the present invention, each of the premixing chambers is connected between the straight section and the expansion section.

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

[0009] According to one embodiment of the present invention, the number of the 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 another portion of the premixing chambers are connected to the gas outlet end of the expansion section.

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

[0011] According to one embodiment of the present invention, the transition section includes an arcuate pipe section and a vertical pipe section, the air inlet end of the arcuate 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 arcuate pipe section and extends upward.

[0012] The technical solution adopted by the present invention to solve the above second technical problem is: a burner, the burner comprising:

[0013] The ejector tube as described in any one of the above items;

[0014] A fire distributor, arranged above the ejector tube, comprising a gas mixing chamber corresponding to the ejector tube;

[0015] A fire cover is arranged on the top of the gas mixing chamber.

[0016] According to one embodiment of the present invention, the mixing chamber includes an outer annular wall, an inner annular wall and a bottom wall connected between the outer annular wall and the inner annular wall, the bottom wall is provided with an air inlet hole, the top outer side of the fire cover is provided with an air outlet hole, and the side of the inner annular wall close to the air inlet hole is provided with a guiding slope inclined from bottom to top toward the direction of the air outlet hole.

[0017] According to an embodiment of the present invention, a side of the inner annular wall close to the air inlet hole is provided with an arc-shaped groove corresponding to the air inlet hole, and the top of the arc-shaped groove is connected to the guiding inclined surface.

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

[0019] A mounting bracket is connected to one side of the ejector tube body close to the gas outlet end thereof and is provided with a limiting hole corresponding to the ejector tube body;

[0020] A sleeve is connected between the air inlet and the limiting hole, and the connection between the ejector tube and the ignition distributor can be achieved 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, a first annular bulge is provided on one side of the ejector tube body close to its air outlet end, and a second annular bulge is provided on one end of the sleeve close to the ejector tube body. The second annular bulge is clamped with the mounting groove, and when the ejector tube body is inserted into the limiting hole to a preset position, the first annular bulge abuts against the outer side of the bottom of the mounting groove.

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

[0024] The premixing chamber of the present invention can make the gas and air fully premixed in the ejector tube, avoiding the problems of uneven pressure, flame length and uneven heating in the ignition distributor, and improving the combustion performance, stability and user experience of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

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

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

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

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

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

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

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

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

[0034] Fig. 9 is a schematic diagram of an ignition divider according to an exemplary embodiment.

[0035] Fig.10 is a cross-sectional view of an ignition divider according to an exemplary embodiment.

[0036] Fig.11 is a schematic diagram of a mounting bracket according to an exemplary embodiment. Description of the drawings:

[0038] 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 tube section; 142. vertical tube section; 15. first annular convex hull;

[0039] 2. Fire distributor; 20. Mixing chamber; 201. Outer annular wall; 202. Inner annular wall; 203. Bottom wall; 2020. Guide slope; 2021. Arc groove; 21. Air inlet; 211. Limiting groove;

[0040] 3. Fire cover; 31. Vent hole;

[0041] 4. Mounting bracket; 40. Limiting hole; 41. Mounting slot; 42. Mounting hole;

[0042] 5. sleeve; 51. second annular convex hull;

[0043] 6. Gas distribution baffle;

[0044] 7. Ignition needle bracket. DETAILED DESCRIPTION

[0045] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of 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 comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted.

[0046] The terms "a", "an", "the", "" are used to indicate the presence of one or more elements / components / etc.; the terms "including" and "having" are used to express an open-ended inclusive meaning and mean that additional elements / components / etc. may be present in addition to the listed elements / components / etc.

[0047] The embodiment of the present invention provides an ejector tube, such as Figure 1-5As shown, the ejector tube 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 flow area of ​​the premixing chamber 101 first increases and then decreases along the air flow direction. The gas mixing structure 10 in the present application is used to fully premix the gas and air entering the ejector tube, so as to avoid the problems of uneven gas outlet, flame length and uneven heating caused by the uneven pressure inside the igniter 2, and improve the combustion performance. In addition, as the gas flow area of ​​the premixing chamber 101 increases, the air flow velocity decreases, and in this process, the air flow will be fully mixed; as the air flow continues to move forward, the gas flow area of ​​the air flow gradually decreases, and at this time, the mixed air flow can be accelerated to ensure the speed of the air flow and the ejection effect. Therefore, the present application can not only make the gas fully premixed and burned more fully through the premixing chamber, but also ensure the ejection effect, improve the product stability, and provide better user experience.

[0048] In a preferred embodiment of the present invention, Figure 1-5 The ejector body 1 shown includes a contraction section 11, a straight section 12, an expansion section 13 and a transition section 14 in sequence along the airflow direction, 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 ignition distributor 2. Among them, the central axis of the contraction section 11, the straight section 12 and the expansion section 13 extends in the horizontal direction, and the transition section 14 is connected between the expansion section 13 and the ignition distributor 2, which can smoothly guide the gas transported by the expansion section 13 to the ignition distributor 2 located in the vertical direction without losing the airflow velocity as much as possible, thereby improving the gas transportation efficiency and ensuring the gas demand of the burner.

[0049] Preferably, the cone vertex angle of the expansion section 13, that is, the angle between the two side walls on the axial section of the expansion section 13, is α, wherein 7°≤α≤9.5°. Within this range, a better ejection capability can be obtained. In addition, the outer diameter of the air inlet end of the contraction section 11 of this embodiment is 39 mm, and the length of the straight section 12 is 40 mm.

[0050] In a preferred embodiment of the present invention, Figure 2 , 3 As shown, each premixing chamber 101 is connected between the straight section 12 and the expansion section 13 . Figure 2 The diagram shows a situation where a premixing chamber 101 is provided between the straight section 12 and the expansion section 13, and the gases are fully mixed in the premixing chamber 101 as above. Of course, 2, 3, 4, 5 or even more premixing chambers may be provided as needed, as long as the gases can be mixed evenly and the gas injection effect is guaranteed, and the present application again does not impose any limitation thereto.

[0051] In a preferred embodiment of the present invention, Figure 1As shown, each premixing chamber 101 is connected to the gas outlet end of the expansion section 13. That is, the gas enters the premixing chamber 101 after passing through the contraction section 11, the straight section 12 and the expansion section 13. The gas is first decelerated and mixed in the premixing chamber 101 and then accelerated before entering the transition section 14, thereby ensuring the gas delivery speed, improving the gas mixing effect and enhancing the combustion performance. Figure 1 The case of one premixing chamber 101 is shown. According to needs, 2, 3, 4, 5 or even more premixing chambers can be provided, as long as the gas can be mixed evenly and the gas injection effect is guaranteed. Again, this application does not impose any limitation.

[0052] In a preferred embodiment of the present invention, Figure 4 As shown, the number of premixing chambers 101 is greater than or equal to two, wherein some of the premixing chambers 101 are connected between the straight section 12 and the expansion section 13, and the other part of the premixing chambers 101 are connected to the gas outlet end of the expansion section 13. When the number of premixing chambers 101 is greater than or equal to two, the plurality of premixing chambers 101 can be arranged on the left and right sides of the expansion section 13, that is, the gas enters the premixing chamber 101 located on the right side of the expansion section 13 after passing through the contraction section 11 and the straight section 12 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, so that the gas and air are fully mixed, thereby improving the combustion effect and user experience.

[0053] In a preferred embodiment of the present invention, Figure 5 As shown, the number of 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. The cylindrical connecting chamber 102 functions similarly to the straight section 12 of the ejector tube, and can accelerate the gas in the two adjacent premixing chambers 101 and increase the flow rate of the ejected gas. Figure 5 As shown in the figure, for example, the gas enters the first mixing chamber 101 on the right through the contraction section 11 and the straight section 12. As its flow area increases and then decreases, the gas enters the cylindrical connecting chamber 102 for acceleration again, and then enters the second mixing chamber 101 on the right for full mixing, which not only ensures the gas flow rate but also improves the mixing effect.

[0054] In a preferred embodiment of the present invention, 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 be used to smoothly guide the horizontally extending airflow to the vertical direction, and can also enable the ejector tube to maintain a good ejection capability, thereby improving the combustion performance of the product.

[0055] In summary, the air inlet end and / or the air outlet end of the expansion section 13 of the present application are connected to a gas mixing structure 10, and the gas mixing structure 10 includes at least one premixing chamber 101, and the gas flow area of ​​the premixing chamber 101 increases first and then decreases along the air flow direction. The gas mixing structure 10 can be arranged in Figure 1 The outlet end of the expansion section 13 shown in the figure may also be arranged at Figure 2 , 3 and the air inlet end of the expansion section 13 shown in FIG. 5 , that is, the straight section 12 and the expansion section 13; when the number of premixing chambers 101 is 2 or more, as shown in FIG. Figure 4 As shown, part of the premixing chamber 101 can also be arranged on both sides of the expansion section 13 to ensure that the gas can be fully mixed in the ejector tube, improve the performance of the burner, and avoid the problem of uneven gas output caused by uneven pressure inside the ignition distributor 2. At the same time, the different positions of the premixing chamber 101 on the ejector body 1 will also affect the ejection gas flow rate.

[0056] An embodiment of the present invention provides a burner, such as Figure 7-11 The burner shown includes: the above-mentioned ejector tube, a igniter 2 and a fire cover 3. The igniter 2 includes a gas mixing chamber 20 corresponding to the ejector tube. The igniter 2 is arranged above the ejector tube, and the fire cover 3 is arranged on the top of the gas mixing chamber 20. Since the ejector tube has a gas mixing structure 10, the gas and air entering the ejector tube can be fully premixed, avoiding the problem of uneven pressure inside the igniter 2 due to uneven gas mixing. In addition, the igniter 2 can mix the air and gas entering its cavity again and then discharge them from the fire cover 3. Since the gas is fully mixed in the ejector tube and the igniter 2 successively, the gas outlet is evenly distributed, which improves the combustion performance and product stability of the product and provides a better user experience.

[0057] In addition, the outlet area of ​​the ignition device 2 is 430-550mm 2 Between, preferably 450mm 2 In order to ensure the uniformity of the gas output of the ignition divider 2, the present application also installs a gas dividing baffle 6 in the ignition divider 2. The gas dividing baffle 6 is fixed to the top of the ignition divider 2 by screws. The installation height of the gas dividing baffle 6 in the ignition divider 2 is 7.5 mm. The gas dividing baffle 6 is located between the air inlet 21 and the air outlet 31. Preferably, the gas dividing baffle 6 is located below the axial projection of the air outlet 31 to divert the fuel gas, so that the gas output of the ignition divider 2 is more uniform, thereby improving the thermal efficiency of the burner.

[0058] In a preferred embodiment of the present invention, Figure 7-11The illustrated mixing chamber 20 includes an outer annular wall 201, an inner annular wall 202, and a bottom wall 203 connected between the outer annular wall 201 and the inner annular wall 202. The bottom wall 203 is provided with an air inlet 21. The top outer side of the fire cover 3 is provided with an air outlet 31. A guide slope 2020 inclined from bottom to top toward the direction of the air outlet 31 is provided on one side of the inner annular wall 202 close to the air inlet 21. The guide slope 2020 is inclined from bottom to top toward the direction of the air outlet 31. In this embodiment, the guide slope 2020 guides the gas entering the ignition distributor 2 so that it quickly rises to the air outlet 31, so that the gas entering the mixing chamber 20 is quickly guided to the air outlet 31, and the air outlet is accelerated to achieve rapid ignition.

[0059] Preferably, the projection of the air outlet hole 31 on the plane where the air outlet end of the air inlet hole 21 is located does not intersect with the air outlet end surface of the air inlet hole 21, in order to ensure that there is no air outlet hole 31 directly above the air inlet hole 21 and to ensure the uniformity of the burner's air outlet.

[0060] In a preferred embodiment of the present invention, Figure 9-10 The inner annular wall 202 shown is provided with an arc groove 2021 corresponding to the air inlet 21 on one side close to the air inlet 21, and the top of the arc groove 2021 is connected to the guiding slope 2020. In this embodiment, since the ejector tube 11 in this application is directly connected to the igniter 2, in order to increase the gas delivery amount of the ejector tube 11 to the igniter 2, the diameter of the air inlet 21 is made larger, and in order to avoid the inner annular wall 202 affecting the air intake speed, an arc groove 2021 is provided on the inner annular wall 202, and the inner circumference of the arc groove 2021 is coplanar with the outer circumference of the air inlet 21, and the guiding slope 2020 is used to guide the gas entering the arc groove 2021, so that the gas entering the gas mixing chamber 20 is quickly guided to the air outlet 31, and the air outlet is accelerated to achieve rapid ignition.

[0061] In a preferred embodiment of the present invention, Figure 9-10 The burner shown also includes a mounting bracket 4 and a sleeve 5. The mounting bracket 4 is connected to one side of the ejector tube body 1 near its gas outlet end, and is provided with 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, and the ejector tube and the ignition divider 2 can be connected by the mounting bracket 4 and the sleeve 5. The limiting structure 41 and the sleeve 5 can realize the fast fixing of the ejector assembly 1 and the ignition divider 2, simplify the assembly process, and effectively ensure the installation dimensions of the ejector tube 11 and the ignition divider 2, solve the problem of structural matching leakage caused by the production process, and improve the safety performance and assembly efficiency of the product.

[0062] Preferably, Fig.10The air inlet end of the air inlet hole 21 shown extends toward the direction of the sleeve 5, so that the fitting depth between the air inlet hole 21 and the air inlet hole 21 is not less than 7 mm; wherein, the inner wall of the air inlet hole 21 is provided with a limiting groove 211 for installing the sleeve 5, the sleeve 5 can be inserted into the limiting groove 211, the top of the sleeve 5 and the bottom of the limiting groove 211 fit tightly, and the inner circumference of the sleeve 5 and the inner circumference of the air inlet hole 21 are coplanar. The sleeve 5 can seal the ejector tube 11 and the ignition divider 2. By controlling the fitting depth of the sleeve 5 and the ignition divider 2, the sealing between the ejector tube 11 and the ignition divider 2 can be effectively enhanced, and the air leakage caused by the excessive fitting clearance and production process between the ejector tube 11 and the ignition divider 2 can be avoided, thereby improving the safety performance of the product.

[0063] In a preferred embodiment of the present invention, Figure 6-8 The top surface of the mounting bracket 4 shown in FIG. 11 is recessed downward to form a mounting groove 41, and 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 fit, and the ejector tube 11 and the limiting hole 40 are interference fit. The sleeve 5 is inserted into the mounting groove 41, and the ejector tube 11 is inserted into the limiting hole 40, so that the connection structure of the ejector tube 11, the mounting bracket 4 and the sleeve 5 is simple and easy to operate. It is only necessary to set the mounting groove 41 and the limiting hole 40 on the mounting bracket 4 to realize the alignment and assembly of the ejector tube 11 and the sleeve 5, which has a simple structure, convenient processing and convenient assembly.

[0064] like Figure 6-8 There is at least one ejector tube 11 and one-to-one correspondence between the limiting hole 40 and the ejector tube 11 shown in FIG. Fig.11There are two limit holes 40 shown, and in some embodiments, there may be one, three, four, five, six or even more, which can be set according to the number of ejector tubes 11. Since the air inlet ends of multiple ejector tubes 11 are fixed and maintained on the same plane by ejector tube end face brackets, 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 two adjacent limit 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 two adjacent limit 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 40 mm, that is, a=40 mm, and the length difference between the two adjacent ejector tubes 11 is 20 mm. 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 20 mm, which can improve the ejection performance of the outer ring and improve thermal efficiency. The length in this embodiment is the distance of the projection of the ejector tube 11 in the Y direction, so that the outer diameter of the ejector tube 11 or the diameter of the limiting hole 40 can be used to calculate the distance between the centers of two adjacent limiting holes 40. Therefore, the size and position of the limiting hole 40 can be used to define the assembly size and position of the ejector tube 11 and control the assembly size of the inner and outer ejector tubes 11. By controlling the position of different limiting holes 40 on the mounting bracket 4, the assembly size of the inner and outer ejector tubes 11 can be guaranteed. In the process of assembling the burner, only two limiting holes 40 and mounting bracket 4 that meet the design requirements need to be selected to achieve the control of the assembly size of the ejector tube.

[0065] Preferably, the burner further comprises an ignition needle assembly, the ignition needle assembly comprises 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 and the mounting bracket 4 are fixed with screws, wherein the mounting bracket 4 is further provided with a mounting hole 42 for mounting the ignition needle assembly, such as Figure 7 As shown, there are two mounting holes 42 which can be used to mount the ignition needle and the flameout protection device respectively. The distances from the ignition needle and the flameout protection device to the fire cover 3 can be effectively controlled through the two mounting holes 42, thereby ensuring the assembly effect of the ignition needle assembly and the fire cover 3.

[0066] In a preferred embodiment of the present invention, Figure 7 The ejector tube body 1 shown is provided with a first annular convex bump 15 on one side close to the gas outlet end thereof, and a second annular convex bump 51 is provided on one end of the sleeve 5 close to the ejector tube body 1. The second annular convex bump 51 is engaged with the mounting groove 41. When the ejector tube body 1 is inserted into the limiting hole 40 to a preset position, the first annular convex bump 15 abuts against the outer side of the bottom of the mounting groove 41. The first annular convex bump 15 and the second annular convex bump 51 simultaneously press the mounting bracket 4 from the upper and lower sides respectively, so that the ejector tube 11, the sleeve 5 and the mounting bracket 4 can be assembled, and the assembly structure is simple.

[0067] In the embodiments of the present invention, the term "plurality" refers to two or more than two, unless otherwise clearly defined. The terms "installation", "connection", "fixation" and the like should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0068] In the description of the embodiments of the present invention, it needs to be understood that the directions or positional relationships indicated by the terms "upper" and "lower" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the embodiments of the present invention.

[0069] In the description of this specification, the description of the terms "one embodiment", "a preferred embodiment", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0070] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An ejector tube, characterized in that: The invention comprises an ejector tube body (1) and a gas mixing structure (10) connected to the ejector tube body (1), wherein the gas mixing structure (10) comprises at least one premixing chamber (101), and the gas flow 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) comprises a contraction section (11), a straight section (12), an expansion section (13) and a transition section (14) in sequence along the airflow direction; 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 ignition distributor (2).

3. The ejector tube according to claim 2, characterized in that: Each of the premixing 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 premixing chambers (101) is connected to the gas outlet end of the expansion section (13).

5. The ejector tube according to claim 2, characterized in that: The number of the 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 another portion of the premixing chambers (101) are connected to the gas outlet end 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) comprises an arc-shaped pipe section (141) and a vertical pipe section (142), wherein 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 according to any one of claims 1 to 7; A fire distributor (2) is arranged above the ejector tube and comprises a gas mixing chamber (20) corresponding to the ejector tube; A fire cover (3) is arranged on the top of the gas mixing chamber (20).

9. The burner according to claim 8, characterized in that The mixing chamber (20) comprises an outer annular wall (201), an inner annular wall (202) and a bottom wall (203) connected between the outer annular wall (201) and the inner annular wall (202); the bottom wall (203) is provided with an air inlet hole (21); the top outer side of the fire cover (3) is provided with an air outlet hole (31); and a guide slope (2020) inclined from bottom to top toward the direction of the air outlet hole (31) is provided on one side of the inner annular wall (202) close to the air inlet hole (21).

10. The burner according to claim 9, characterized in that An arc-shaped groove (2021) corresponding to the air inlet hole (21) is provided on one side of the inner annular wall (202) close to the air inlet hole (21), and the top of the arc-shaped groove (2021) is connected to the guide inclined surface (2020).

11. The burner according to claim 9, characterized in that Also includes: A mounting bracket (4) is connected to a side of the ejector tube body (1) close to its gas outlet end and is provided with a limiting hole (40) corresponding to the ejector tube body (1); A sleeve (5) is connected between the air inlet (21) and the limiting hole (40), and the connection between the ejector tube and the ignition distributor (2) can be achieved 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), 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) is provided with a first annular bulge (15) on one side close to the air outlet end thereof, and the sleeve (5) is provided with a second annular bulge (51) on one end close to the ejector tube body (1). The second annular bulge (51) is snap-fitted to the mounting groove (41). When the ejector tube body (1) is inserted into the limiting hole (40) to a preset position, the first annular bulge (15) abuts against the outer side of the bottom of the mounting groove (41).

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