Combustor

Abstract

The utility model provides a burner, which belongs to the technical field of gas stoves, and comprises an ejector assembly, a fire distributor, a connecting piece and a mounting bracket, the fire distributor comprises an air inlet hole corresponding to the air outlet end of the ejector assembly, the fire distributor is arranged above the ejector assembly, the air outlet end of the ejector assembly and the air inlet hole are connected through the connecting piece, and the mounting support is connected between the connecting piece and the ejector assembly. And the mounting bracket is provided with a limiting structure for aligning and limiting the connecting piece and the ejector assembly. According to the utility model, the problem of gas leakage caused by the assembly process of the burner can be solved, and the use safety of products and the use experience of users are improved.

Description

Technical Field

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

[0002] Currently, stainless steel burners are mostly assembled from single pieces. The burner structure consists of multiple components, such as the injector assembly, the igniter, and the ignition needle assembly. The assembly structure is complex, prone to loosening, and has poor dimensional consistency. In particular, the fit between the injector and the igniter can lead to air leakage due to manufacturing processes. 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 a burner that solves the problems of uncontrollable burner installation dimensions and large assembly gaps leading to air leakage, thereby improving product safety and user experience.

[0004] The technical solution adopted by this utility model to solve the first technical problem mentioned above is: a burner, the burner comprising:

[0005] Ejector assembly;

[0006] A flame distributor is disposed above the ejector assembly and includes an air inlet corresponding to the air outlet end of the ejector assembly.

[0007] A connector that connects the outlet end of the ejector assembly to the inlet port;

[0008] The mounting bracket is connected between the connector and the ejector assembly, and has a limiting structure for aligning and limiting the connector and the ejector assembly.

[0009] According to one embodiment of the present invention, the ejector assembly includes an ejector tube, the connector includes a sleeve corresponding to the ejector tube, and the limiting structure includes a limiting hole for limiting the installation position of the ejector tube. The limiting hole is connected between the sleeve and the ejector tube, so that the gas delivered by the ejector tube enters the interior of the fire distributor sequentially through the limiting hole, the sleeve and the air inlet.

[0010] According to one embodiment of the present invention, the limiting structure further includes a mounting groove formed by the downward recess of the top surface of the mounting bracket, the limiting hole being provided at the bottom of the mounting groove, the sleeve being detachably connected to the mounting groove, and the air outlet end of the ejector tube being inserted into the limiting hole to realize the connection of the ejector tube, the limiting structure and the sleeve.

[0011] According to one embodiment of the present invention, the ejector tube is provided with a first annular protrusion near its outlet end. As the ejector tube is inserted into the limiting hole, the first annular protrusion can abut against the side of the mounting bracket near the ejector tube.

[0012] A second annular protrusion is provided on the outer periphery of the end of the sleeve near the ejector tube. The second annular protrusion can be inserted into and engaged with the mounting groove to realize the connection between the mounting bracket and the connector.

[0013] According to one embodiment of the present invention, the ejector tube sequentially includes a contraction section, a straight section, an expansion section, and a transition section along the airflow direction. The transition section includes an arc-shaped pipe section and a vertical pipe section. The contraction section, the straight section, and the expansion section are sequentially connected along the Y direction. The air inlet end of the arc-shaped pipe section is connected to the air outlet end of the expansion section. The vertical pipe section is connected to the air outlet end of the arc-shaped pipe section and extends upward.

[0014] According to one embodiment of the present invention, the cone apex angle of the expansion segment is α, wherein 7°≤α≤9.5°.

[0015] According to one embodiment of the present invention, the ejector tube and the limiting hole are each at least one and correspond one-to-one.

[0016] According to one embodiment of the present invention, the number of ejector tubes is greater than or equal to two, wherein the distance between the centers of the air inlet ends of two adjacent ejector tubes is equal to the distance between the centers of the centers of the two adjacent limiting holes in the X direction, and the distance between the centers of the air outlet ends of two adjacent ejector tubes is equal to the distance between the centers of the centers of the two adjacent limiting holes in the Y direction.

[0017] According to one embodiment of the present invention, the air inlet end of the air inlet extends toward the sleeve so that the fitting depth between the air inlet and the air inlet is not less than 7mm.

[0018] The inner wall of the air inlet is provided with a limiting groove for installing the sleeve. The sleeve can be inserted into the limiting groove, and the top end of the sleeve and the bottom of the limiting groove are tightly fitted together.

[0019] According to one embodiment of the present invention, a gas distribution baffle is installed on the side of the flame distributor near its outlet end, a flame cap assembly is installed on the top of the flame distributor, the flame cap assembly is provided with an outlet hole, the gas distribution baffle is located between the inlet hole and the outlet hole, and the projection of the outlet hole on the plane where the outlet end of the inlet hole is located does not intersect with the outlet end face of the inlet hole.

[0020] Compared with the prior art, the present invention has the following advantages or beneficial effects:

[0021] This invention, through the cooperation of the connector and the mounting bracket, can effectively solve the problems of uncontrollable burner installation dimensions and large assembly gaps causing air leakage, thereby improving product safety and user experience. Attached Figure Description

[0022] 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.

[0023] Figure 1 This is a front view of a burner shown according to an exemplary embodiment.

[0024] Figure 2 This is a perspective view of a burner according to an exemplary embodiment.

[0025] Figure 3 This is a top view of a burner according to an exemplary embodiment.

[0026] Figure 4 This is a first cross-sectional view of a burner according to an exemplary embodiment.

[0027] Figure 5 yes Figure 4 Enlarged view of point A in the middle.

[0028] Figure 6 This is a second cross-sectional view of a burner according to an exemplary embodiment.

[0029] Figure 7 This is a schematic diagram of a mounting bracket according to an exemplary embodiment.

[0030] Figure 8 This is a schematic diagram of a fire distributor according to an exemplary embodiment.

[0031] Figure 9 This is a cross-sectional view of a fire distributor according to an exemplary embodiment. Attached image description:

[0033] 1. Ejector assembly; 11. Ejector tube; 110. First annular bulge; 111. Contraction section; 112. Straight section; 113. Expansion section; 114. Transition section; 1141. Arc-shaped pipe section; 1142. Vertical pipe section

[0034] 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;

[0035] 3. Connector; 31. Sleeve; 310. Second annular protrusion;

[0036] 4. Mounting bracket; 41. Limiting structure; 411. Mounting groove; 410. Limiting hole; 42. Mounting hole;

[0037] 5. Air distribution baffle;

[0038] 6. Flame cap assembly; 61. Vent hole;

[0039] 7. Ignition needle bracket. Detailed Implementation

[0040] 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.

[0041] 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.

[0042] This utility model embodiment provides a burner, such as Figure 1-9 As shown, the burner includes an ejector assembly 1, a flame spreader 2, a connector 3, and a mounting bracket 4. The flame spreader 2 is positioned above the ejector assembly 1 and includes an air inlet 21 corresponding to the air outlet of the ejector assembly 1. The connector 3 connects the air outlet of the ejector assembly 1 and the air inlet 21. The mounting bracket 4 connects the connector 3 and the ejector assembly 1 and has a limiting structure 41 for aligning and limiting the connector 3 and the ejector assembly 1. The connector 3 effectively ensures the installation dimensions of the ejector tube 11 and the flame spreader 2, solving the problem of air leakage due to structural fit caused by the manufacturing process and improving the safety performance of the product. The limiting structure 41 fixes the ejector assembly 1 and the connector 3, simplifying the assembly process and improving assembly efficiency.

[0043] In a preferred embodiment of this utility model, such as Figure 1-7 The ejector assembly 1 shown includes an ejector tube 11, the connector 3 includes a sleeve 31 corresponding to the ejector tube 11, and the limiting structure 41 includes a limiting hole 410 for limiting the installation position of the ejector tube 11. The limiting hole 410 is connected between the sleeve 31 and the ejector tube 11, so that the gas delivered by the ejector tube 11 enters the interior of the ignition distributor 2 sequentially through the limiting hole 410, the sleeve 31, and the air inlet 21. Figure 1-6The ejector tube 11 and sleeve 31 are connected to the air inlet and outlet ends of the limiting hole 410, respectively. Specifically, the ejector tube 11 can be inserted into and snapped into the limiting hole 410, and the sleeve 31 is connected to the top outer periphery of the limiting hole 410. When there are two or more ejector tubes 11, the limiting hole 410 limits the assembly position of different ejector tubes 11 and can also be used to align the ejector tubes 11 and sleeve 31, simplifying the assembly process and improving assembly efficiency.

[0044] In a preferred embodiment of this utility model, such as Figure 4-7 The limiting structure 41 shown also includes a mounting groove 411 formed by a downward recess from the top surface of the mounting bracket 4. A limiting hole 410 is provided at the bottom of the mounting groove 411. The sleeve 31 can be inserted into the mounting groove 411, and the air outlet end of the ejector tube 11 can be inserted into the limiting hole 410 to achieve the connection of the ejector tube 11, the limiting structure 41, and the sleeve 31. In this application, the mounting groove 411 and the sleeve 31 are interference-fitted, and the ejector tube 11 and the limiting hole 410 are interference-fitted. The sleeve 31 is inserted into the mounting groove 411, and the ejector tube 11 is inserted into the limiting hole 410, which can achieve the connection of the ejector tube 11, the mounting bracket 4, and the sleeve 31. The structure is simple and the operation is convenient. Only by setting the mounting groove 411 and the limiting hole 410 on the mounting bracket 4 can the ejector tube 11 and the sleeve 31 be aligned and assembled. The structure is simple, easy to process, and easy to assemble.

[0045] In a preferred embodiment of this utility model, such as Figure 4-7 The ejector tube 11 shown has a first annular protrusion 110 near its outlet end. As the ejector tube 11 is inserted into the limiting hole 410, a second annular protrusion 310 is provided on the outer periphery of the sleeve 31 near one end of the ejector tube 11. The first annular protrusion 110 can abut against the side of the mounting bracket 4 near the ejector tube 11; the second annular protrusion 310 can be inserted into and engaged in the mounting groove 411, realizing the connection between the mounting bracket 4 and the connector 3. Figure 4-6 As shown, after the ejector tube 11 is inserted into the limiting hole 410 to the preset position, the first annular protrusion 110 can abut against the bottom of the mounting bracket 4, and the second annular protrusion 310 is pressed into the interior of the mounting groove 411 and abuts against the bottom of the mounting groove 411. The first annular protrusion 110 and the second annular protrusion 310 simultaneously press the mounting bracket 4 from the upper and lower sides, respectively, thus completing the assembly of the ejector tube 11, the sleeve 31 and the mounting bracket 4. The assembly structure is simple.

[0046] In a preferred embodiment of this utility model, such as Figure 1-6The ejector tube 11 shown includes, along the airflow direction, a contraction section 111, a straight section 112, an expansion section 113, and a transition section 114. The transition section 114 includes an arc-shaped section 1141 and a vertical section 1142. The contraction section 111, the straight section 112, and the expansion section 113 are connected sequentially along the Y direction. The inlet end of the arc-shaped section 1141 is connected to the outlet end of the expansion section 113. The vertical section 1142 is connected to the outlet end of the arc-shaped section 1141 and extends upward. Figure 4 and 6 As shown, the transition section 114 can smoothly guide the horizontally extending airflow into the vertical direction, so that the ejector tube maintains good ejection capability and improves combustion performance.

[0047] In a preferred embodiment of this utility model, such as Figure 1-4 The cone apex angle of the expansion segment 113 shown in Figure 6 is α, where 7° ≤ α ≤ 9.5°. For example... Figure 4 and 6 As shown, the included angle between the two sidewalls on the axial sectional plane of the expansion section 113 is α, where 7°≤α≤9.5°, and better ejection capability can be obtained within this range. In this embodiment, the outer diameter d of the air inlet end of the contraction section 111 is 39mm, and the length c of the straight section 112 is 40mm.

[0048] In a preferred embodiment of this utility model, such as Figure 1-7 The ejector tube 11 and the limiting hole 410 shown are each at least one and correspond one-to-one. For example... Figure 7 There are two limiting holes 410 shown. In some embodiments, there can be one, three, four, five, six or even more. The size and position of the limiting holes 410 can limit the assembly size and position of the ejector tube 11 and control the assembly size of the inner and outer ejector tubes 11.

[0049] In a preferred embodiment of this utility model, such as Figure 1-7 The ejector tubes 11 shown are greater than or equal to two, wherein the distance between the centers of the air inlet ends of two adjacent ejector tubes 11 is equal to the distance between the centers of the centers of the two adjacent limiting holes 410 in the X direction, and the distance between the centers of the air outlet ends of two adjacent ejector tubes 11 is equal to the distance between the centers of the centers of the two adjacent limiting holes 410 in the Y direction. Figure 1 , 3Figures 7 and 8 illustrate the X and Y directions, respectively. The plane containing the air inlet end of ejector tube 11 is in the X direction, and the direction of the central axis of the air inlet end of ejector tube 11 is in the Y direction. Since the air inlets of multiple ejector tubes 11 are fixed and maintained on the same plane by ejector tube end face supports, the distance 'a' between the centers of the air inlets of two adjacent ejector tubes 11 is equal to the distance 'a' between the centers of the centers of the two adjacent limiting holes 410 in the X direction, and the distance 'b' between the centers of the air outlets of two adjacent ejector tubes 11 is equal to the distance 'b' between the centers of the centers of the two adjacent limiting holes 410 in the Y direction. In this embodiment, the distance between the centers of the air inlets of two adjacent ejector tubes 11 is 40mm, i.e., 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. This improves the ejection performance of the outer ring and increases thermal efficiency. In this embodiment, the length is the distance projected onto the ejector tube 11 in the Y direction. Thus, the distance between the centers of two adjacent limiting holes 410 can be calculated from the outer diameter of the ejector tube 11 or the diameter of the limiting hole 410. Therefore, by controlling the position of different limiting holes 410 on the mounting bracket 4, it is possible to ensure... Figure 1-5 The assembly dimensions of the inner and outer ejector tubes 11 shown can be controlled by selecting two limiting holes 410 and mounting brackets 4 that meet the design requirements during the burner assembly process.

[0050] 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 holes that 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 assembly 6 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 assembly 6.

[0051] In a preferred embodiment of this utility model, such as Figure 4-9The air inlet end of the air inlet 21 extends towards the sleeve 31, ensuring that the mating depth between the air inlet 21 and the sleeve 31 is not less than 7mm. The inner wall of the air inlet 21 has a limiting groove 211 for installing the sleeve 31. The sleeve 31 can be inserted into the limiting groove 211, with the top of the sleeve 31 and the bottom of the limiting groove 211 tightly fitted. The inner circumferential surface of the sleeve 31 is coplanar with the inner circumferential surface of the air inlet 21. The sleeve 31 can seal the connection between the ejector tube 11 and the ignition distributor 2. By controlling the mating depth between the sleeve 31 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.

[0052] In a preferred embodiment of this utility model, such as Figure 1-4 As shown in Figures 6, 8-9, a gas distribution baffle 5 is installed on the side of the flame distributor 2 near its outlet end. A flame cap assembly 6 is installed on the top of the flame distributor 2, and the flame cap assembly 6 has an outlet hole 61. The gas distribution baffle 5 is located between the inlet hole 21 and the outlet hole 61. The projection of the outlet hole 61 onto the plane where the outlet end of the inlet hole 21 is located does not intersect with the outlet end face of the inlet hole 21. In this application, the outlet area of ​​the flame distributor 2 is 430-550 mm². 2 Between these values, the preferred air outlet area is 450mm². 2 Meanwhile, the projection of the air outlet 61 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. This is to ensure that there is no air outlet 61 directly above the air inlet 21, thus ensuring the uniformity of the gas output from the burner.

[0053] In this application, the gas distribution baffle 5 is fixed to the top of the burner 2 by screws. The installation height of the gas distribution baffle 5 in the burner 2 is 7.5mm. The gas distribution baffle 5 is located between the air inlet 21 and the air outlet 61. Preferably, the gas distribution baffle 5 is located below the axial projection of the air outlet 61 to divert the gas flow, making the gas output of the burner 2 more uniform and improving the thermal efficiency of the burner.

[0054] Preferred, such as Figure 1-4The igniter 2 shown in 6, 8-9 includes a mixing chamber 20 corresponding to the ejector tube 11. The flame cap assembly 6 includes a flame cap 60 covering the top of the mixing chamber 20. The mixing chamber 20 includes an outer ring wall 211, an inner ring wall 202, and a bottom wall 203 connecting the outer ring wall 211 and the inner ring wall 202. The bottom wall 203 has an air inlet 21. The outer side of the top of the flame cap 60 has an air outlet 61. 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. The top of the arc-shaped groove 2021 is connected to a guide slope 2020, which is inclined from bottom to top towards the direction of the air outlet. 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 gas 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 and the outer circumferential surface of the air inlet 21 are coplanar. 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 gas outlet 61, thereby accelerating the gas output and achieving rapid ignition.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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. A burner, characterized in that, include: Ejector assembly (1); The fire distributor (2) is disposed above the ejector assembly (1) and includes an air inlet (21) corresponding to the air outlet end of the ejector assembly (1). Connector (3) connects the outlet end of the ejector assembly (1) and the inlet (21); The mounting bracket (4) is connected between the connector (3) and the ejector assembly (1), and has a limiting structure (41) for aligning and limiting the connector (3) and the ejector assembly (1).

2. The burner according to claim 1, characterized in that, The ejector assembly (1) includes an ejector tube (11), the connector (3) includes a sleeve (31) corresponding to the ejector tube (11), and the limiting structure (41) includes a limiting hole (410) for limiting the installation position of the ejector tube (11). The limiting hole (410) is connected between the sleeve (31) and the ejector tube (11) so that the gas delivered by the ejector tube (11) enters the interior of the fire distributor (2) in sequence through the limiting hole (410), the sleeve (31) and the air inlet (21).

3. The burner according to claim 2, characterized in that, The limiting structure (41) further includes a mounting groove (411) formed by the downward recess of the top surface of the mounting bracket (4). The limiting hole (410) is provided at the bottom of the mounting groove (411). The sleeve (31) is detachably connected to the mounting groove (411). The air outlet end of the ejector tube (11) can be inserted into the limiting hole (410) to realize the connection of the ejector tube (11), the limiting structure (41) and the sleeve (31).

4. The burner according to claim 3, characterized in that, in, The ejector tube (11) has a first annular protrusion (110) on its outer periphery near its outlet end. As the ejector tube (11) is inserted into the limiting hole (410), the first annular protrusion (110) can abut against the side of the mounting bracket (4) near the ejector tube (11). The outer periphery of the sleeve (31) near the ejector tube (11) is provided with a second annular protrusion (310). The second annular protrusion (310) can be inserted into and snapped into the mounting groove (411) to realize the connection between the mounting bracket (4) and the connector (3).

5. The burner according to claim 2, characterized in that, The ejector tube (11) includes, in sequence along the airflow direction, a contraction section (111), a straight section (112), an expansion section (113), and a transition section (114). The transition section (114) includes an arc-shaped pipe section (1141) and a vertical pipe section (1142). The contraction section (111), the straight section (112), and the expansion section (113) are connected in sequence along the Y direction. The air inlet end of the arc-shaped pipe section (1141) is connected to the air outlet end of the expansion section (113). The vertical pipe section (1142) is connected to the air outlet end of the arc-shaped pipe section (1141) and extends upward.

6. The burner according to claim 5, characterized in that, The cone apex angle of the expansion segment (113) is α, where 7°≤α≤9.5°.

7. The burner according to claim 2, characterized in that, The ejector tube (11) and the limiting hole (410) are at least one and correspond one-to-one.

8. The burner according to claim 2, characterized in that, The number of ejector tubes (11) is greater than or equal to two, wherein the distance between the centers of the air inlet ends of two adjacent ejector tubes (11) is equal to the distance between the centers of the two adjacent limiting holes (410) in the X direction, and the distance between the centers of the air outlet ends of two adjacent ejector tubes (11) is equal to the distance between the centers of the two adjacent limiting holes (410) in the Y direction.

9. The burner according to claim 2, characterized in that, The air inlet end of the air inlet (21) extends toward the sleeve (31) so that the fitting depth between the air inlet (21) and the air inlet (21) is not less than 7mm. The inner wall of the air inlet (21) is provided with a limiting groove (211) for installing the sleeve (31), the sleeve (31) can be inserted into the limiting groove (211), and the top of the sleeve (31) and the bottom of the limiting groove (211) are closely fitted.

10. The burner according to claim 1, characterized in that, The flame divider (2) has a gas distribution baffle (5) installed on one side near its outlet end. The flame divider (2) has a flame cap assembly (6) installed on its top. The flame cap assembly (6) has an outlet hole (61). The gas distribution baffle (5) is located between the inlet hole (21) and the outlet hole (61). The projection of the outlet hole (61) on the plane where the outlet end of the inlet hole (21) is located does not intersect with the outlet end face of the inlet hole (21).

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