Combustor and gas equipment

Abstract

The invention discloses a combustor and gas equipment, and relates to the technical field of gas equipment. Wherein the burner comprises a fire grate and an injection device, and the fire grate is provided with an air inlet; the injection device is installed at an air inlet of the fire grate and provided with an injection channel and a fuel gas channel arranged 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, the air outlet end of the injection channel is communicated with the air inlet, and the fuel gas introduction port is communicated with the fuel gas channel. The gas-air mixer is used for conveying gas-air mixture into the fire grate. According to the technical scheme, fuel gas and air can be mixed more sufficiently, sufficient combustion can be achieved, and emission of nitric oxide is reduced.

Description

Technical Field

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

[0002] The burner is an important component of the gas equipment, and the burner grate is the core component of the burner.

[0003] In the related art, generally, gas nozzles are arranged at intervals outside the air inlet of the burner grate, and the gas nozzles are used to inject gas into the burner grate. After the surrounding air is entrained into the burner grate and mixed, it is discharged from the fire holes and ignited. However, in this way of mixing inside the burner grate, there is a situation where the gas-air mixture is not uniform, which easily leads to incomplete combustion and a high emission of nitrogen oxides. Summary of the Invention

[0004] The main object of the present invention is to propose a burner, aiming to fully mix gas and air before combustion and reduce the emission of nitrogen oxides.

[0005] To achieve the above object, the burner proposed by the present invention includes: A burner grate having an air inlet; and An ejector device installed at the air inlet of the burner grate. The ejector device is provided with an ejection channel and a gas channel arranged 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. The air outlet end of the ejection channel is communicated with the air inlet, and is used for conveying a gas-air mixture into the burner grate.

[0006] In an embodiment of the present application, the gas channel is arranged around the outer periphery of the ejection channel, and the gas inlet for ejection is arranged on the peripheral wall of the ejection channel and is close to the air inlet end.

[0007] In an embodiment of the present application, the ejection channel includes an air inlet section, a first mixing section, and a connection section connected in sequence from the air inlet end to the air outlet end. The inlet end of the air inlet section forms the air inlet end, and the outlet end of the connection section forms the air outlet end and is inserted into the air inlet. At the connection between the air inlet section and the first mixing section, the cross-sectional area of the first mixing section is set to increase or decrease relative to the cross-sectional area of the air inlet section. The gas inlet for ejection is arranged at the connection between the air inlet section and the first mixing section.

[0008] In an embodiment of the present application, the cross-sectional area of the first mixing section gradually decreases from the air inlet section to the connection section.

[0009] In an embodiment of the present application, the cross-sectional area of the connection section remains unchanged and is consistent with the cross-sectional area at the outlet end of the first mixing section.

[0010] In an embodiment of the present application, the cross-sectional area of the first mixing section suddenly increases relative to the cross-sectional area of the intake section.

[0011] In an embodiment of the present application, the cross-sectional area of the first mixing section remains unchanged from the intake section to the connection section; The cross-sectional area of the connection section gradually decreases in a direction away from the first mixing section.

[0012] In an embodiment of the present application, at least one gas inlet is provided on the peripheral wall of the ejector passage; And / or, the axis of the gas inlet is inclined with respect to the axis of the ejector passage, and the opening of the gas inlet is arranged facing the air inlet.

[0013] In an embodiment of the present application, the burner has an air flow passage, and the air flow passage includes a contraction section, a second mixing section, and a diffuser section connected in sequence; The contraction section is connected to the air inlet and is tapered in a direction away from the ejector passage from the air inlet; the cross-sectional area of the second mixing section remains unchanged from the contraction section to the diffuser section; the diffuser section is tapered in the air inlet direction.

[0014] In an embodiment of the present application, the cross-sectional area at the outlet end of the contraction section is smaller than the cross-sectional area at the outlet end of the ejector passage.

[0015] In an embodiment of the present application, the ejector device and the burner are of an integral structure.

[0016] To achieve the above object, the present application further provides a gas device, including a blower and the burner as described above, and the blower is used to drive air to enter the ejector passage from the air inlet end.

[0017] In the burner of the technical solution of the present invention, an ejector device is installed at the air inlet of the burner. The ejector device has an ejector passage and a gas passage. By inputting air from the air inlet end of the ejector passage, a negative pressure will be generated at the gas inlet when the air flows towards the outlet end of the ejector passage, forming a suction force on the gas in the gas passage, and sucking the gas in the gas passage into the ejector passage from the gas inlet to mix with the air; the gas-air mixture after mixing in the ejector passage can enter the burner from the outlet end and the air inlet of the burner to continue mixing. Thus, the mixing path of air and gas is extended, so that the gas and air are mixed more fully, can burn fully, and reduce the emission of nitrogen oxides. Description of the Drawings

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in 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.

[0019] Figure 1 Structural schematic diagram of an embodiment of the burner of the present invention; Figure 2 Structural schematic diagram of another embodiment of the burner of the present invention; Figure 3 For Figure 1 Structural schematic diagram of the ejector device in the embodiment; Figure 4 For Figure 3 Full sectional view of the embodiment; Figure 5 For Figure 4 Partial enlarged view at M in; Figure 6 For Figure 2 Structural schematic diagram of the ejector device in the embodiment; Figure 7 For Figure 6 Full sectional view of the embodiment.

[0020] Explanation of the reference numerals in the drawings:

[0021] The realization of the object of the present invention, functional features and advantages will be further described with reference to the embodiments and the drawings. Detailed implementation manners

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to 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.

[0023] 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 positional 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.

[0024] Meanwhile, the meaning of "and / or" or "and / or" appearing throughout the text is that it includes three scenarios. Taking "A and / or B" as an example, it includes Scenario A, or Scenario B, or the scenario where both A and B are satisfied simultaneously.

[0025] In addition, if there are descriptions such as "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly specifying 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 can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0026] In the related art, generally, a gas nozzle is disposed at an interval outside the air inlet of the burner head. The gas nozzle is used to inject gas into the burner head, and the surrounding air is entrained to enter the burner head through the interval area between the air inlet of the burner head and the gas nozzle for mixing. However, in this way, the gas nozzle usually injects gas in a single-point straight line in the middle to entrain the surrounding air, and the air and gas need to enter the interior of the burner head to mix. The mixing path of the gas and air is short, and there is a situation where the gas-air mixture is uneven, which easily leads to incomplete combustion and a high emission of nitrogen oxides.

[0027] For this reason, the present invention proposes a burner. By installing an ejector device that uses air to eject gas at the air inlet of the burner head, the air and gas are mixed before entering the burner head, which can extend the mixing path of the air and gas, improve the mixing uniformity of the gas and air, enable the burner to burn sufficiently, and reduce the emission of nitrogen oxides. The specific structure of the burner will be described below by way of embodiments.

[0028] As Figures 1 to 4 shown, the burner includes a burner head 200 and an ejector device 100. The burner head 200 has an air inlet 201, and the ejector device 100 is installed at the air inlet 201 of the burner head 200. The ejector device 100 is provided with an ejection channel 11 and a gas channel 12 disposed outside the ejection channel 11. The ejection 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 ejection channel 11 is used to input air. The gas inlet 101 is communicated with the gas channel 12. The air outlet end 11b of the ejection channel 11 is communicated with the air inlet 201 and is used to convey the gas-air mixture into the burner head 200.

[0029] As can be understood, an air flow channel is provided within the fire grate 200, with the air inlet 201 serving as the entrance to the air flow channel and the outlet of the air flow channel serving as the fire hole of the fire grate 200. By installing an ejection device 100 at the air inlet 201, the ejection device 100 comprises an ejection channel 11 and a gas channel 12. Air is introduced from the air inlet end 11a of the ejection channel 11. As the air flows toward the air outlet end 11b of the ejection channel 11, negative pressure is generated at the gas inlet 101, creating suction on the gas within the gas channel 12. This causes the gas within the gas channel 12 to be ejected from the gas inlet 101 into the ejection channel 11 to mix with the air. The gas-air mixture, initially mixed within the ejection channel 11, can then enter the air flow channel from the air outlet end 11b and the air inlet 201 of the fire grate 200 for further mixing before being ejected from the fire hole to be ignited and burned.

[0030] It should be noted that the air and gas in this embodiment are mixed before entering the fire grate 200, and continue to mix after entering the fire grate 200. Thus, compared with the method of arranging gas nozzles at intervals on the outside of the air inlet 201 in the related art, this embodiment can extend the path for mixing air and gas, so that the gas and air are mixed more fully, can be fully burned, and reduce the emission of nitrogen oxides.

[0031] In practical applications, the ejector device 100 and the fire bar 200 can be connected by structural assembly, such as screw fixation, snap fixation, plug-in fixation, etc. Alternatively, the ejector device 100 and the fire bar 200 can be an integral structure, such as integrally molded.

[0032] In the ejection device 100, the ejection channel 11 refers to a structure for guiding the flow of air and mixing the gas. The air inlet end 11a is used to input air, and the air outlet end 11b is used to output the gas-air mixture. Specifically, it can be implemented by a tubular structure with a variable diameter or a constant diameter, and the mixing of gas and air is promoted through an axial flow path. Optionally, the ejection device 100 is made of metal material, and the internal processing forms a cylindrical ejection channel 11. The gas channel 12 refers to a channel for transporting gas, and gas can be introduced into the ejection channel 11 through the gas inlet 101. The gas channel 12 can be implemented by an annular cavity or a separate pipe structure. Optionally, the gas channel 12 can achieve physical isolation between gas and air by being externally placed. Optionally, it can be an annular gas channel 12 connecting all the gas inlets 101, or it can be a plurality of independent pipeline gas channels 12 respectively connected to the corresponding gas inlets 101. The gas inlet 101 refers to an opening or through-hole structure provided on the inner wall of the ejection channel 11 , and is used to introduce the gas from the gas channel 12 into the ejection channel 11 . Specifically, it can be implemented by using a plurality of independent holes or continuous annular holes.

[0033] In summary, in the burner of the technical solution of the present invention, an ejector device 100 is installed at the air inlet 201 of the burner row 200. The ejector device 100 has an ejector passage 11 and a gas passage 12. 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, and the gas in the gas passage 12 will be introduced into the ejector passage 11 from the gas inlet 101 and mixed with the air; the gas-air mixture after mixing in the ejector passage 11 can enter the burner row 200 from the air outlet end 11b and the air inlet 201 of the burner row 200 to continue mixing. Thus, the mixing path of the air and the gas is extended, the gas and the air are more fully mixed, can burn fully, and the emission of nitrogen oxides is reduced.

[0034] Please refer to Figure 3 、 Figure 4 and Figure 7 , in an embodiment of the present application, the gas passage 12 is arranged around the outer periphery of the ejector passage 11, and the gas inlet 101 is arranged on the peripheral wall of the ejector passage 11 and is close to the air inlet end 11a.

[0035] With such a design, the gas in the gas passage 12 can be evenly diffused in a three-dimensional rotation to each circumferential position of the annular cavity and evenly transported to a plurality of gas inlets 101 on the peripheral wall of the ejector passage 11, so that each gas inlet 101 can discharge gas into the ejector passage 11, avoiding the phenomenon of uneven mixing caused by local concentration of the gas.

[0036] The gas inlet 101 is arranged close to the air inlet end 11a, so that the gas is introduced at the initial stage when the air enters the ejector passage 11, extending the mixing path and mixing time of the gas and the air in the ejector passage 11, and enabling the gas and the air to be fully diffused and evenly mixed during the flow process. With such a design, the distance between the gas inlet 101 and the air inlet 201 of the burner row 200 can be extended, the mixing length of the air and the gas can be further extended, and the phenomenon of uneven local concentration caused by insufficient mixing time of the gas and the air can be avoided.

[0037] Further, please refer to Figure 3 、 Figure 4 and Figure 7 , the ejector device 100 is provided with a gas inlet 102 communicating with the gas passage 12, and the gas inlet 102 is used to connect the gas inlet pipe 20; the gas inlet 102 and the gas inlet 101 are respectively arranged on both sides of the gas passage 12 in the axial direction.

[0038] It can be understood that the inlet end of the gas inlet pipe 20 is used to communicate with the gas pipe (or communicate with the gas distribution rod structure communicating with the gas pipe), and the outlet end of the gas inlet pipe 20 communicates with the gas inlet 102 of the gas passage 12, aiming to transport the gas into the gas passage 12. By arranging the gas inlet 102 and the gas introduction port 101 on both sides of the gas passage 12 in the axial direction, the flow path of the gas in the gas passage 12 is extended, so that the gas can be arranged circumferentially around the injection passage 11. After the gas enters the gas passage 12 from the gas inlet 102, it can flow axially to the area of the gas introduction port 101, forming an air flow direction opposite to the air flow direction in the injection passage 11, and then enters the injection passage 11 from the gas introduction port 101, which can further increase the turbulent flow effect between the gas and the air, making the mixing of the two more uniform.

[0039] Please refer to Figure 3 、 Figure 4 、 Figure 6 and Figure 7 , in an embodiment of the present application, the injection passage 11 includes an intake section 111, a first mixing section 112, and a connection section 114 that are sequentially connected from the intake end 11a to the outlet end 11b. The inlet end of the intake section 111 is formed as the intake end 11a, and the outlet end of the connection section 114 is formed as the outlet end 11b and is inserted into the intake port 201; at the connection between the intake section 111 and the first mixing section 112, the cross-sectional area of the first mixing section 112 is set to increase or decrease relative to the cross-sectional area of the intake section 111, and the gas introduction port 101 is arranged at the connection between the intake section 111 and the first mixing section 112.

[0040] It can be understood that the first mixing section 112 is located on the downstream side of the intake section 111, and the cross-sectional area of the injection passage 11 changes at the connection between the intake section 111 and the first mixing section 112. Then when the air flow flows from the intake section 111 to the first mixing section 112, due to the sudden change in the cross-sectional area of the first mixing section 112 relative to the cross-sectional area of the intake section 111, the air flow will be disordered at the connection between the intake section 111 and the first mixing section 112. By arranging the gas introduction port 101 at the connection between the intake section 111 and the first mixing section 112, the gas can be quickly mixed into the air flow at this connection when entering the injection passage 11, making the gas and the air fully mixed.

[0041] It should be noted that in this embodiment, the cross-sectional area of the ejecting channel 11 changes at the connection between the air inlet section 111 and the first mixing section 112. It can be understood that the cross-sectional area of the first mixing section 112 increases or decreases relative to the cross-sectional area of the air inlet section 111. When it increases, a vortex will be formed at the change of the cross-sectional area of the air flow, and the gas can be sucked into the vortex, improving the gas-air mixing uniformity; when it decreases, the flow velocity of the air flow at the change of the cross-sectional area will increase, and the generated negative pressure will be greater, so the ejecting suction force on the gas is stronger, enabling more gas to be mixed into the air, achieving the purpose of improving the gas-air mixing degree.

[0042] Hereinafter, embodiments in which the cross-sectional area of the first mixing section 112 decreases or increases relative to the cross-sectional area of the air inlet section 111 will be exemplified.

[0043] Please refer to Figure 3 and Figure 4 , in an embodiment, in the direction from the air inlet end 11a to the air outlet end 11b, the cross-sectional area of the first mixing section 112 gradually decreases. In this embodiment, the cross-sectional area of the first mixing section 112 decreases relative to the cross-sectional area of the air inlet section 111, making the inner wall of the first mixing section 112 in a tapered contraction structure. During the process of air flowing through the ejecting channel 11, the gradually decreasing cross-sectional area causes the fluid flow velocity to increase steadily, forming a stable negative pressure region in the first mixing section 112, enabling the gas to be efficiently sucked into the ejecting channel 11, and at the same time, the accelerating air and the gas form a laminar flow mixture.

[0044] Furthermore, in the direction from the first mixing section 112 to the air outlet end 11b, the cross-sectional area of the connecting section 114 remains unchanged and is the same as the cross-sectional area at the outlet end of the first mixing section 112. It can be understood that since the cross-sectional area of the first mixing section 112 gradually decreases, the air flow velocity in the first mixing section 112 gradually increases. By providing the connecting section 114 at the outlet end of the first mixing section 112, the cross-sectional area of the connecting section 114 is the same as the cross-sectional area at the outlet end of the first mixing section 112, making the connection between the two smooth. Then, when the gas-air mixed air flow flows from the first mixing section 112 to the connecting section 114, the mixed air flow can smoothly enter the connecting section 114. The cross-sectional area of the connecting section 114 remains unchanged, which can effectively buffer the mixed air flow, avoiding uneven mixing due to too fast air flow velocity, and maintaining the fluid flow stability in the connecting section 114, avoiding pressure fluctuations or energy losses caused by sudden changes in the cross-sectional area. In addition, the connecting section 114 can extend the mixing contact time of the air and the gas, effectively improving the gas-air mixing uniformity.

[0045] Please refer to Figure 6 and Figure 7, in one embodiment, the cross-sectional area of the first mixing section 112 suddenly increases relative to the cross-sectional area of the intake section 111. In this embodiment, when the air flow flows from the intake section 111 to the first mixing section 112, due to the sudden increase in the cross-sectional area of the first mixing section 112, a vortex will be formed at the mutation of the cross-sectional area, so that the gas can be directly sucked into the vortex and mixed with the air when entering the first mixing section 112, making the mixing of the gas and the air more sufficient. At the same time, the air flow velocity can be reduced, and the mixing contact time of the gas and the air in the first mixing section 112 can be extended, further improving the mixing uniformity. Specifically, a step 113 is formed at the connection between the intake section 111 and the first mixing section 112, and the gas inlet 101 is arranged at the step 113.

[0046] Further, in the direction from the intake end 11a to the outlet end 11b, the cross-sectional area of the first mixing section 112 remains unchanged; the cross-sectional area of the connecting section 114 gradually decreases in the direction away from the first mixing section 112. A vortex is formed at the connection between the intake section 111 and the first mixing section 112, enabling the gas and the air to be fully mixed. On this basis, by setting the cross-sectional area of the first mixing section 112 to be unchanged, the stability of the flow of the air-gas mixture can be maintained, avoiding pressure fluctuations or energy losses of the mixture due to changes in the cross-sectional area in the first mixing section 112. Since the cross-sectional area of the first mixing section 112 is larger than that of the intake section 111, the flow velocity of the air flow in the first mixing section 112 will decrease, and the mixing contact time of the air and the gas will be extended, effectively improving the mixing uniformity of the gas and the air. On the basis of the reduction of the air flow velocity and the uniform mixing, in this embodiment, a connecting section 114 is provided at the outlet end of the first mixing section 112, and the connecting section 114 is tapered in the direction away from the first mixing section 112, that is, the cross-sectional area of the connecting section 114 gradually decreases in the direction of the outlet end 11b, which can increase the flow velocity of the air-gas mixture in the connecting section 114 to ensure the air flow intensity when the air-gas mixture is injected into the burner 200 from the outlet end 11b.

[0047] Please refer to Figures 3 to 7 , in one embodiment of the present application, the gas inlet 101 at least partially surrounds the peripheral wall of the injection channel 11.

[0048] By arranging the gas inlet 101 to at least partially surround the peripheral wall of the injection channel 11, compared with the way of single-strand injection of gas in the middle in the related art, in this embodiment, the gas enters the air from the circumferential direction of the injection channel 11, increasing the contact area between the gas and the air and the position where the gas enters the air, and effectively improving the mixing uniformity of the gas and the air.

[0049] In actual application, the shape and structure of the gas inlet 101 can be determined according to the actual situation.

[0050] Please refer to Figures 3 to 5 , in one embodiment, there are multiple gas inlets 101, and the multiple gas inlets 101 are circumferentially spaced along the injection channel 11.

[0051] It can be understood that the circumferential spacing of the multiple gas inlets 101 divides the gas into multiple independent airflows, which are injected into the injection channel 11 at different angles, forming a more sufficient and continuous contact with the air flowing in the injection channel 11, and can further improve the mixing efficiency and mixing uniformity of the gas and air. Such a design avoids the problems of local gas accumulation or uneven distribution that may be caused by a single gas inlet.

[0052] Optionally, the gas inlet 101 can be a circular hole, a square hole, a triangular hole or some special-shaped holes, etc.

[0053] Please refer to Figure 6 and Figure 7 , in one embodiment, the gas inlet 101 is an annular hole surrounding the circumferential wall of the injection channel 11.

[0054] By setting the gas inlet 101 as an annular hole structure, the gas can be uniformly introduced into the injection channel 11 along the entire annular cross-section for mixing with the air, eliminating the airflow blank area between local areas.

[0055] 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 continuous mixing of the gas and air in the circumferential dimension, increasing the contact area between the gas and air, and causing the air and gas to turbulently mix in the injection channel 11, improving the mixing uniformity.

[0056] In one embodiment, there are multiple gas inlets 101, and the multiple gas inlets 101 are axially spaced along 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 air more uniform.

[0057] Please refer to Figure 5 and Figure 7 , 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 facing the air inlet 201 of the burner 200.

[0058] By designing the axis of the gas inlet 101 to be at an inclined angle with the axis of the ejector passage 11, a gas jet is formed with an axial component velocity and a radial component velocity along the axis of the ejector passage 11. The axial component velocity is in the same direction as the air flow direction, avoiding the turbulent loss caused by the direct impact of the gas flow on the wall of the ejector passage 11. The radial component velocity can promote the diffusion distribution of the gas across the cross-section of the ejector passage 11. By arranging the opening of the gas inlet 101 towards the air inlet 201 of the burner 200, the direction of the gas jet forms a downstream flow with the overall movement direction of the mixed gas flow. The kinetic energy of the air flow in the ejector passage 11 is utilized 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.

[0059] 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.

[0060] Please refer to Figure 1 and Figure 2 In an embodiment of the present application, the burner 200 is provided with an air flow passage, which includes a contraction section 210, a second mixing section 220, and a diffuser section 230 connected in sequence; the contraction section 210 is connected to the air inlet 201 and is tapered in a direction away from the ejector passage 11 from the air inlet 201; the cross-sectional area of the second mixing section 220 remains unchanged from the contraction section 210 to the diffuser section

[230] ; the diffuser section 230 is tapered in the air inlet direction.

[0061] In this embodiment, the air flow passage is connected with the contraction section 210, the second mixing section 220, and the diffuser section 230 in sequence at the air inlet 201. The contraction section 210 is tapered in the air inlet direction. The second mixing section 220 connects the contraction section 210 and the diffuser section 230, and the cross-sectional area of the second mixing section 220 remains unchanged from the contraction section 210 to the diffuser section 230. The diffuser section 230 is tapered in the air inlet direction. Thus, when the mixture of air and gas is injected into the contraction section 210 from the outlet end 11b of the ejector passage 11, the tapered setting of the contraction section 210 can increase the velocity of the mixed gas flow and enhance the ejector effect; after the mixed gas flow enters the second mixing section 220 for mixing, it will enter the diffuser section 230 to change from dynamic pressure to static pressure, increasing the pressure of the mixed gas and making the air and gas mix more evenly.

[0062] Please refer to Figures 1 to 3 In an embodiment of the present application, the cross-sectional area at the outlet end of the contraction section 210 is smaller than the cross-sectional area at the outlet end 11b of the ejector passage 11. Such a design further extends the ejector path, making the mixing effect of air and gas better, the gas concentration distribution more uniform, and the combustion emission performance better.

[0063] Taking the example that the first mixing section 112 is tapered, combined with the tapered setting of the contraction section 210 of the burner 200, there are at least two narrowings in the air flow path. The air-gas mixture will successively pass through the narrowed first mixing section 112, the gentle connecting section 114, the narrowed contraction section 210, the gentle second mixing section 220, and the gradually expanding diffuser section 230 and then spray out from the burner holes. In this way, when the air and gas flow, they will pass through the changes of multiple different flow cross-sections, can be subjected to different pressure changes, and achieve a better mixing effect.

[0064] The present invention also provides a gas device, which includes a blower and a burner. The specific structure of the burner refers to the above embodiments. 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 injection channel 11 from the air inlet end 11a.

[0065] Optionally, the gas device can be a gas water heater, a gas wall-mounted boiler, a boiler, etc.

[0066] Optionally, the gas device can be a forced draft type gas device or a forced exhaust type gas device.

[0067] 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 description and drawings of the present invention under the inventive concept of the present invention, or direct / indirect application in other related technical fields are all included in the patent protection scope of the present invention.

Claims

1. A burner, characterized in that, Comprising: A burner, the burner having an air inlet; And An ejector device, installed at the air inlet of the burner, the ejector device being provided with an ejection channel and a gas channel disposed outside the ejection channel, the ejection channel having an air inlet end, an air outlet end, and a gas inlet, the air inlet end of the ejection channel being for inputting air, the gas inlet communicating with the gas channel, and the air outlet end of the ejection channel communicating with the air inlet for delivering a gas-air mixture into the burner.

2. The burner according to claim 1, characterized in that, The gas channel is disposed around the outer periphery of the ejection channel, and the gas inlet is disposed on the peripheral wall of the ejection channel and is close to the air inlet end.

3. The burner according to claim 2, characterized in that, The ejection channel includes an air inlet section, a first mixing section, and a connection section that are sequentially connected from the air inlet end to the air outlet end, the inlet end of the air inlet section being formed as the air inlet end, the outlet end of the connection section being formed as the air outlet end, and being inserted into the air inlet. At the connection between the air inlet section and the first mixing section, the cross-sectional area of the first mixing section is set to increase or decrease relative to the cross-sectional area of the air inlet section, and the gas inlet is disposed at the connection between the air inlet section and the first mixing section.

4. The burner according to claim 3, characterized in that, The cross-sectional area of the first mixing section gradually decreases from the air inlet section to the connection section.

5. The burner according to claim 4, characterized in that, The cross-sectional area of the connection section remains unchanged and is the same as the cross-sectional area at the outlet end of the first mixing section.

6. The burner according to claim 3, characterized in that, The cross-sectional area of the first mixing section suddenly increases relative to the cross-sectional area of the air inlet section.

7. The burner according to claim 6, characterized in that, The cross-sectional area of the first mixing section remains unchanged from the air inlet section to the connection section; The cross-sectional area of the connection section gradually decreases in a direction away from the first mixing section.

8. The burner according to any one of claims 2 to 7, characterized in that, At least one of the gas inlets is provided on the peripheral wall of the ejection channel; And / or, the axis of the gas inlet is inclined with respect to the axis of the ejection channel, and the opening of the gas inlet faces the air inlet.

9. The burner according to any one of claims 1 to 7, characterized in that, The burner is provided with an air flow channel, the air flow channel including a contraction section, a second mixing section, and a diffuser section that are sequentially connected; The contraction section is connected to the air inlet and is tapered in a direction away from the ejection channel from the air inlet; the cross-sectional area of the second mixing section remains unchanged from the contraction section to the diffuser section; The diffuser section is tapered in the air inlet direction.

10. The burner according to claim 9, characterized in that, The cross-sectional area at the outlet end of the contraction section is smaller than the cross-sectional area at the air outlet end of the ejection channel.

11. The burner according to any one of claims 1 to 7, characterized in that, The ejector device and the burner are of an integral structure.

12. A gas device, characterized in that, Comprising a blower and a burner according to any one of claims 1 to 11, the blower being configured to drive air to enter the ejection channel from the air inlet end.

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