Ejecting device, burner and fuel gas equipment

Abstract

The invention discloses an injection device, a combustor and gas equipment, and relates to the technical field of combustors. Wherein the injection device comprises a main body, the main body is provided with an injection channel and a fuel gas channel, and the fuel gas channel is located outside the injection channel; the injection channel is provided with an air inlet end, an air outlet end and a fuel gas introduction port, the air inlet end of the injection channel is used for inputting air, the fuel gas introduction port is communicated with the fuel gas channel, and the air outlet end of the injection channel is used for outputting a fuel gas and air mixture; wherein at least one fuel gas inlet is formed in the peripheral wall of the injection channel. According to the technical scheme, the mixing uniformity of fuel gas and air can be improved, so that the combustor can combust sufficiently, and emission of carbon monoxide and nitrogen oxide is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of burners, and particularly relates to an ejector device, a burner, and a gas device. Background Art

[0002] A burner is an important component of a gas device.

[0003] In related technologies, a gas nozzle is usually arranged at the air inlet of a burner, and the gas nozzle is used to inject gas toward the air inlet of the burner to eject air into the burner for mixing, and then the mixture is discharged from the flame holes for combustion. However, in this pre-mixing method of gas ejecting air, there is a situation where the gas-air mixture in the burner is not uniform, resulting in incomplete combustion and generating more carbon monoxide and nitrogen oxides. Summary of the Invention

[0004] The main object of the present invention is to propose an ejector device, aiming to improve the mixing uniformity of gas and air, enabling the burner to burn sufficiently and reducing the emissions of carbon monoxide and nitrogen oxides.

[0005] To achieve the above object, the ejector device proposed by the present invention includes a main body, the main body is provided with an ejection channel and a gas channel, and the gas channel is located outside the ejection channel; The ejection channel is provided with an air inlet end, an air outlet end, and a gas inlet for ejection. The air inlet end of the ejection channel is used for inputting air, the gas inlet for ejection is communicated with the gas channel, and the air outlet end of the ejection channel is used for outputting a gas-air mixture; Wherein, at least one gas inlet for ejection is provided on the peripheral wall of the ejection channel.

[0006] In an embodiment of the present application, there are at least two gas inlets for ejection, and at least two gas inlets for ejection are distributed at intervals along the circumferential direction of the ejection channel; Or, the gas inlet for ejection is an annular hole surrounding the peripheral wall of the ejection channel; Or, there are at least two gas inlets for ejection, and two gas inlets for ejection are arranged at intervals along the axial direction of the ejection channel.

[0007] In an embodiment of the present application, the axis of the gas inlet for ejection is inclined with respect to the axis of the ejection channel, and the opening of the gas inlet for ejection faces the air outlet end of the ejection channel.

[0008] In an embodiment of the present application, from the air inlet end of the ejection channel to the air outlet end of the ejection channel, the flow area of the ejection channel gradually decreases or remains unchanged.

[0009] In one embodiment of the present application, the ejection channel includes an air intake section and a mixing section sequentially connected along the air intake direction, and the inner diameter of the mixing section is larger than the inner diameter of the air intake section, so that a step is formed at the connection between the mixing section and the air intake section; The gas inlet is arranged in a region of the mixing section close to the step.

[0010] In one embodiment of the present application, the gas inlet is provided at the connection between the mixing section and the air intake section; A guide slope is provided on one side of the step facing the gas inlet.

[0011] In one embodiment of the present application, the gas inlet is arranged close to the gas inlet end of the ejection channel.

[0012] In one embodiment of the present application, the gas channel is arranged around the outer circumference of the ejection channel, and the gas channel extends from one axial end to the other end of the ejection channel.

[0013] In one embodiment of the present application, the ejection device further includes a gas inlet pipe connected to the main body, the gas channel is provided with a gas inlet connected to the gas inlet pipe, and the gas inlet is located at one end of the gas channel axially away from the gas inlet port.

[0014] To achieve the above-mentioned purpose, the present application also provides a burner, comprising a burner body and the above-mentioned ejection device, wherein the air outlet end of the ejection device is used to connect with the air inlet of the burner body.

[0015] To achieve the above-mentioned purpose, the present application also provides a gas device, including a fan and the above-mentioned burner, wherein the fan is used to drive air from the air inlet end of the injection device into the injection channel.

[0016] The technical solution of the present invention inputs air from the air inlet end of the injection channel. When the air flows toward the air outlet end of the injection channel, negative pressure is generated at the gas inlet, which forms suction on the gas in the gas channel, and the gas in the gas channel is injected from the gas inlet into the injection channel to mix with the air; by arranging at least one gas inlet on the peripheral wall of the injection channel, compared with the method of injecting gas from the middle single stream in the related art, this embodiment allows the gas to enter the air from the circumference of the injection channel, thereby increasing the contact area between the gas and the air, and at the same time increasing the position where the gas enters the air, which can effectively improve the mixing uniformity of the gas and the air. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or in the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0018] Figure 1 Structural schematic diagram of an embodiment of the ejector device of the present invention; Figure 2 For Figure 1 Full sectional view of the embodiment; Figure 3 For Figure 2 Partial enlarged view at M in Figure 4 Structural schematic diagram of another embodiment of the ejector device of the present invention; Figure 5 For Figure 4 Full sectional view of the embodiment; Figure 6 Structural schematic diagram of an embodiment of the burner of the present invention.

[0019] Explanation of the reference numerals in the drawings:

[0020] The realization of the object of the present invention, functional features and advantages will be further described in conjunction with the embodiments with reference to the drawings. Detailed implementation manners

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0022] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0023] At the same time, the meaning of "and / or" or "and / or" appearing throughout the text is that it includes three solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or the solution where A and B are satisfied simultaneously.

[0024] In addition, if the descriptions such as "first" and "second" are involved in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be construed as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments may be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0025] In the related art, a gas nozzle is usually provided at the air inlet of a burner. The gas nozzle is used to inject gas toward the air inlet of the burner to entrain air into the burner for mixing, and then the mixture is discharged from the flame holes for combustion. However, in this way of single-point linear injection and entrainment of air by the gas nozzle, there may be a situation of insufficient entrained air and uneven mixing of gas and air in the burner, which easily leads to incomplete combustion and generates more carbon monoxide and nitrogen oxides.

[0026] Therefore, the present invention provides an entrainment device applied to a gas device. The air is driven into the entrainment device by a blower in the gas device, and the gas is entrained by the air. The entrainment device has at least one gas inlet to increase the coverage range when the gas enters the air, improve the mixing uniformity of the gas and the air, enable the burner to burn sufficiently, and reduce the emission of nitrogen oxides. The specific structure of the entrainment device will be described below by way of embodiments.

[0027] As Figures 1 to 5 shown, the entrainment device 100 includes a main body 10. The main body 10 is provided with an entrainment channel 11 and a gas channel 12. The gas channel 12 is located outside the entrainment channel 11. The entrainment channel 11 is provided with an air inlet end 11a, an air outlet end 11b, and a gas inlet 101. The air inlet end 11a of the entrainment channel 11 is used for inputting air. The gas inlet 101 is communicated with the gas channel 12. The air outlet end 11b of the entrainment channel 11 is used for outputting the gas-air mixture. Among them, at least one gas inlet 101 is provided on the peripheral wall of the entrainment channel 11.

[0028] It can be understood that the entrainment channel 11 refers to a cylindrical structure for guiding the flow of air and mixing gas. Its air inlet end 11a is used for inputting air, and its air outlet end 11b is used for outputting the gas-air mixture. Specifically, it can be realized by using a variable-diameter or equal-diameter tubular structure to promote the mixing of gas and air through the axial flow path. Optionally, the main body 10 of the entrainment device 100 is made of a metal material, and a cylindrical entrainment channel 11 is machined inside.

[0029] The gas passage 12 refers to an independent cavity structure arranged outside the ejector passage 11, which is used to store and convey gas. Specifically, it can be implemented by using an annular cavity or a separate pipe structure, and the physical isolation between gas and air is achieved through an external arrangement. Optionally, it can be an annular gas passage 12 that communicates with all the gas inlets 101, or it can also be gas passages 12 of multiple independent pipes that respectively communicate with the corresponding gas inlets 101.

[0030] The gas inlet 101 refers to an opening or through-hole structure arranged on the peripheral wall of the ejector passage 11, which is used to introduce gas from the gas passage 12 into the ejector passage 11. Specifically, it can be implemented by using multiple independent holes or continuous annular holes, so that the gas can enter the air flow field from different angles, improving the mixing uniformity of gas and air.

[0031] In this embodiment, by inputting air from the air inlet end 11a of the ejector passage 11, when the air flows towards the air outlet end 11b of the ejector passage 11, a negative pressure will be generated at the gas inlet 101, forming a suction force on the gas in the gas passage 12, so as to introduce the gas in the gas passage 12 into the ejector passage 11 from the gas inlet 101 and mix with the air; and since at least one gas inlet 101 is provided on the peripheral wall of the ejector passage 11, compared with the way of single-strand gas injection in the middle in the related art, in this embodiment, the gas enters the air from the circumferential direction of the ejector passage 11, increasing the contact area between the gas and the air, and at the same time increasing the part where the gas enters the air, which can effectively improve the mixing uniformity of the gas and the air.

[0032] In actual application, the shape structure of the gas inlet 101 can be determined according to the actual situation.

[0033] Please refer to Figures 1 to 3 , in an embodiment, there are multiple gas inlets 101, and the multiple gas inlets 101 are distributed at intervals along the circumferential direction of the ejector passage 11.

[0034] It can be understood that the multiple gas inlets 101 distributed at intervals divide the gas into multiple independent airflows, which are injected into the ejector passage 11 along different angles, forming a more sufficient and continuous contact with the air flowing in the ejector passage 11, and can further improve the mixing efficiency and mixing uniformity of the gas and the air. Such a design avoids the problems of local gas aggregation or uneven distribution that may be caused by a single gas inlet. Optionally, the multiple gas inlets 101 are distributed in an annular array.

[0035] Optionally, the gas inlet 101 can be a circular hole, a square hole, a triangular hole or some special-shaped holes, etc.

[0036] Please refer to Figure 4 and Figure 5, in one embodiment, the gas inlet 101 is an annular hole surrounding the peripheral wall of the injection channel 11.

[0037] By setting the gas inlet 101 as an annular hole structure, the gas can be uniformly introduced into the interior of the injection channel 11 along the entire annular cross-section to mix with the air, eliminating the air flow blank area between the local air inlets.

[0038] In addition, the gas is uniformly injected into the injection channel 11 from the entire circumference of the annular hole, forming an annular contact surface with the axially flowing air, realizing the continuous mixing of the gas and the air in the circumferential dimension, increasing the contact area between the gas and the air, making the air and the gas turbulently mix in the injection channel 11, and improving the mixing uniformity.

[0039] In one embodiment, there are multiple gas inlets 101, and the multiple gas inlets 101 are distributed at intervals along the axial direction of the injection channel 11. Such a design can increase the injection area of the gas into the air, making the mixing of the gas and the air more uniform.

[0040] Please refer to Figure 2 , Figure 3 and Figure 5 , in one embodiment of the present application, the axis of the gas inlet 101 is inclined with respect to the axis of the injection channel 11, and the opening of the gas inlet 101 is arranged towards the air outlet end 11b of the injection channel 11.

[0041] By designing the axis of the gas inlet 101 to be at an inclined angle with the axis of the injection channel 11, the gas jet forms an axial component velocity and a radial component velocity along the injection channel 11. The axial component velocity is the same as the air flow direction, avoiding the turbulent loss caused by the direct impact of the gas flow on the wall surface of the injection channel 11. The radial component velocity can promote the diffusion distribution of the gas in the cross-section of the injection channel 11. By arranging the opening of the gas inlet 101 towards the air outlet end 11b, the gas jet direction forms a downstream flow with the overall movement direction of the mixed air flow, using the kinetic energy of the air flow in the injection channel 11 to drive the gas to accelerate and mix, and at the same time, the swirling effect generated by the inclined jet increases the contact area between the gas and the air.

[0042] Such a design not only avoids the kinetic energy cancellation caused by the gas injection direction being completely perpendicular to the air flow direction, but also avoids the problem of insufficient gas diffusion when the two are completely parallel.

[0043] Please refer to Figure 2, in an embodiment of the present application, from the air inlet end 11a of the ejector passage 11 to the air outlet end 11b of the ejector passage 11, the flow-through area of the ejector passage 11 gradually decreases. Such a design makes the inner wall of the ejector passage 11 in a tapered contraction structure. During the process of air flowing through the ejector passage 11, the gradually decreasing flow-through area enables the fluid velocity to increase steadily, forming a stable negative pressure region in the mixing section 112, so that the fuel gas is efficiently sucked into the ejector passage 11, and at the same time, the accelerating air and the fuel gas form a laminar flow mixture.

[0044] In other embodiments of the present application, from the air inlet end 11a of the ejector passage 11 to the air outlet end 11b of the ejector passage 11, the flow-through area of the ejector passage 11 remains unchanged. In this embodiment, the flow-through area of the ejector passage 11 remains unchanged, which can maintain the stability of fluid flow and avoid pressure fluctuations or energy losses caused by sudden changes in cross-sectional area.

[0045] Please refer to Figure 4 and Figure 5 , in an embodiment of the present application, the ejector passage 11 includes an intake section 111 and a mixing section 112 connected in sequence along the air intake direction. The inner diameter of the mixing section 112 is larger than that of the intake section 111, so that a step 113 is formed at the connection between the mixing section 112 and the intake section 111; the fuel gas inlet 101 is arranged in the area of the mixing section 112 close to the step 113.

[0046] In this embodiment, by dividing the ejector passage 11 into the intake section 111 and the mixing section 112, and using the design that the inner diameter of the mixing section 112 is larger than that of the intake section 111 to form a step 113 at the connection between the two, when the air flows through the intake section 111 and enters the mixing section 112, due to the sudden expansion of the inner diameter of the mixing section 112, an eddy current region is formed at the step 113, and the fuel gas is introduced from the area of the mixing section 112 close to the step 113 and is directly drawn into the center of the air flow by the negative pressure generated by the eddy current, avoiding the introduction of the fuel gas concentrated in a single direction or area, and improving the mixing uniformity of the air and fuel gas.

[0047] In addition, the design of the enlarged inner diameter of the mixing section 112 can also reduce the air flow velocity, extend the contact time between the fuel gas and the air in the mixing section 112, and further improve the mixing uniformity.

[0048] Further, please refer to Figure 5 , the fuel gas inlet 101 is arranged at the connection between the mixing section 112 and the intake section 111; a guiding inclined surface is provided on one side of the step 113 facing the fuel gas inlet 101.

[0049] As can be seen from the foregoing embodiments, when air passes through the step 113, eddy currents will be generated. By arranging the gas inlet 101 at the connection between the mixing section 112 and the intake section 111, the gas can be sucked into the eddy current and mixed with air when entering the mixing section 112, improving the mixing uniformity. In practical applications, the gas inlet 101 can be arranged as an annular hole or circumferentially spaced distribution at the connection between the mixing section 112 and the intake section 111.

[0050] In addition, by arranging a guiding inclined surface on the side of the step 113 facing the gas inlet 101 to guide the gas to enter the injection channel 11 along the inclined surface, a spiral motion trajectory of the air flow can be guided. The gas collides and mixes with air multiple times during the spiral motion, improving the mixing uniformity. Further, the guiding inclined surface can divert the gas towards the outlet end 11b of the injection channel 11, on the one hand, preventing the gas from flowing back, and on the other hand, improving the injection efficiency.

[0051] Please refer to Figures 1 to 5 , in an embodiment of the present application, the gas inlet 101 is arranged close to the intake end 11a of the injection channel 11.

[0052] By arranging the gas inlet 101 close to the intake end 11a of the injection channel 11, the gas is introduced at the initial stage when air enters the injection channel 11, extending the mixing path and mixing time of the gas and air in the injection channel 11, enabling the gas and air to fully diffuse and uniformly mix during the flow process. Such a design can avoid the phenomenon of uneven local concentration caused by insufficient mixing time of the gas and air. Thus, the sufficiency of subsequent combustion can be improved, and the generation of carbon monoxide and nitrogen oxides can be reduced.

[0053] Please refer to Figure 2 and Figure 5 , in an embodiment of the present application, the gas channel 12 is arranged around the outer periphery of the injection channel 11, and the gas channel 12 extends from one axial end of the injection channel 11 to the other end.

[0054] It can be understood that the gas channel 12 can be arranged as an annular cavity structure coaxial with the injection channel 11. The inner wall surface of the annular cavity forms a sealed connection with the outer wall surface of the injection channel 11. The gas inlet 101 penetrates the inner and outer wall surfaces of the injection channel 11, enabling the gas channel 12 to communicate with the injection channel 11.

[0055] The gas channel 12 surrounds the outer periphery of the injection channel 11, such that the gas channel 12 covers the entire outer peripheral area of the injection channel 11. The gas can be three-dimensionally rotated and uniformly diffused to each circumferential position of the annular cavity in the gas channel 12, and uniformly transported to multiple gas inlets 101 on the peripheral wall of the injection channel 11, enabling each gas inlet 101 to discharge gas into the injection channel 11, avoiding the occurrence of uneven mixing caused by local concentration of the gas.

[0056] In addition, the gas channel 12 extends from one axial end of the ejection channel 11 to the other end, which can extend the flow path of the gas in the gas channel 12, so that the gas has a sufficient time and path to flow around the circumference of the ejection channel 11, ensuring the uniformity of the gas output from the gas inlet 101 in the circumferential direction of the ejection channel 11, and further improving the uniformity of the mixing of gas and air.

[0057] See also Figures 1 to 5 In one embodiment of the present application, the ejection device 100 further includes a gas inlet pipe 20 connected to the main body 10, and the gas channel 12 is provided with a gas inlet 102 connected to the gas inlet pipe 20, and the gas inlet 102 is located at one end of the gas channel 12 axially away from the gas inlet port 101.

[0058] As will be appreciated, the inlet end of the gas inlet pipe 20 is intended to communicate with the gas pipe (or with a gas distribution rod structure connected to the gas pipe), and the outlet end of the gas inlet pipe 20 is in communication with the gas inlet 102 of the gas passage 12, thereby delivering the gas to the gas passage 12 of the main body 10. By locating the gas inlet 102 at the end of the gas passage 12 axially away from the gas introduction port 101, the flow path of the gas within the gas passage 12 is extended, allowing the gas to be disposed circumferentially around the ejection passage 11.

[0059] In addition, since the gas inlet 101 in the aforementioned embodiment is located near the air inlet end 11a of the ejection channel 11, the gas inlet 102 is located near the air outlet end 11b of the ejection channel 11. Therefore, after the gas enters the gas channel 12 from the gas inlet 102, it can flow axially to the gas inlet 101 area, forming an air flow direction opposite to the air flow direction in the ejection channel 11, and then enter the ejection channel 11 from the gas inlet 101, which can further increase the turbulence of the gas and air, making the mixing of the two more uniform.

[0060] See also Figures 1 to 6 In one embodiment of the present application, the main body 10 is provided with a connecting section 13 at the air outlet end 11b of the injection channel 11, and the connecting section 13 is used to connect with the air inlet of the burner.

[0061] When the ejector device 100 is applied to a burner, the air outlet end 11b of the ejector device 100 needs to be opposite to the air inlet of the burner so that the gas-air mixture can be smoothly sprayed into the burner. In this embodiment, by providing a connection section 13 at the air outlet end 11b of the main body 10, the connection section 13 is docked with the air inlet of the burner to realize the air inlet function of the burner. Optionally, the connection section 13 can be in a ring structure, and its inner cavity is communicated with the air outlet end 11b of the ejector channel 11. The connection section 13 and the air inlet of the burner can be assembled by plugging, welding or some other means.

[0062] Please refer to Figures 1 to 5 , in an embodiment of the present application, the ejector device 100 is an integrally formed structure, which can simplify the manufacturing process and improve production efficiency. Optionally, the ejector device 100 is integrally formed by a mold.

[0063] The present invention also provides a burner, please refer to Figure 6 , the burner includes a burner body 200 and an ejector device 100. The specific structure of the ejector device 100 refers to the above embodiment. Since this burner adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one. Among them, the air outlet end 11b of the ejector device 100 is used to dock with the air inlet of the burner body 200.

[0064] Optionally, it can be that the port of the air outlet end 11b of the ejector device 100 is directly docked and connected with the air inlet of the burner body 200, or it can be that the connection section 13 at the air outlet end 11b is docked and connected with the air inlet of the burner body 200.

[0065] Optionally, it can be assembled by plugging, welding or some other means.

[0066] The present invention also provides a gas device, the gas device includes a blower and a burner. The specific structure of the burner refers to the above embodiment. Since this gas device adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one. Among them, the blower is used to drive air to enter the ejector channel from the air inlet end of the ejector device.

[0067] Optionally, the gas device can be a gas water heater, a gas wall-mounted boiler, a boiler, etc.

[0068] Optionally, the gas device can be a forced draft type gas device or a forced exhaust type gas device.

[0069] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made by using the content of the specification and drawings of the present invention under the inventive concept of the present invention, or any direct / indirect application in other related technical fields shall be included within the patent protection scope of the present invention.

Claims

1. An ejector device, characterized in that, It includes a main body, the main body is provided with an ejector passage and a gas passage, and the gas passage is located outside the ejector passage; The ejector passage is provided with an air inlet end, an air outlet end and a gas inlet, the air inlet end of the ejector passage is used for inputting air, the gas inlet is communicated with the gas passage, and the air outlet end of the ejector passage is used for outputting a gas-air mixture; Wherein, at least one of the gas inlets is provided on the peripheral wall of the ejector passage.

2. The ejector device according to claim 1, characterized in that, There are at least two of the gas inlets, and at least two of the gas inlets are distributed at intervals along the circumferential direction of the ejector passage; Alternatively, the gas inlet is an annular hole surrounding the peripheral wall of the ejector passage; Alternatively, there are at least two of the gas inlets, and two of the gas inlets are arranged at intervals along the axial direction of the ejector passage.

3. The ejector device according to claim 1, characterized in that, The axis of the gas inlet is inclined with respect to the axis of the ejector passage, and the opening of the gas inlet faces the air outlet end of the ejector passage.

4. The ejector device according to claim 1, characterized in that, From the air inlet end of the ejector passage to the air outlet end of the ejector passage, the flow area of the ejector passage gradually decreases or remains unchanged.

5. The ejector device according to claim 1, characterized in that, The ejector passage includes an air inlet section and a mixing section connected in sequence along the air inlet direction, and the inner diameter of the mixing section is larger than that of the air inlet section, so that a step is formed at the connection between the mixing section and the air inlet section; The gas inlet is arranged in the area of the mixing section close to the step.

6. The ejector device according to claim 5, characterized in that, The gas inlet is arranged at the connection between the mixing section and the air inlet section; A guiding inclined surface is provided on one side of the step facing the gas inlet.

7. The ejector device according to any one of claims 1 to 6, characterized in that, The gas inlet is arranged close to the air inlet end of the ejector passage.

8. The ejector device according to any one of claims 1 to 6, characterized in that, The gas passage is arranged annularly around the outer periphery of the ejector passage, and the gas passage extends from one end of the ejector passage in the axial direction to the other end.

9. The ejector device according to claim 8, characterized in that, The ejector device further includes a gas inlet pipe connected to the main body, the gas passage is provided with a gas inlet communicated with the gas inlet pipe, and the gas inlet is located at one end of the gas passage axially away from the gas inlet.

10. A burner, characterized in that, It includes a burner body and the ejector device according to any one of claims 1 to 9, and the air outlet end of the ejector device is used for docking with the air inlet of the burner body.

11. A gas device, characterized in that, It includes a fan and the burner according to claim 10, and the fan is used to drive air to enter the ejector passage from the air inlet end of the ejector device.

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