Burners and gas equipment

Abstract

This invention discloses a burner and a gas-fired device, relating to the field of gas-fired device technology. The burner includes a burner bar and an ejector device. The burner bar has an air inlet. The ejector device is installed at the air inlet of the burner bar and has an ejector channel and a gas passage located outside the ejector channel. The ejector channel has an air inlet end, an air outlet end, and a gas inlet. The air inlet end of the ejector channel is used to input air, the gas inlet is connected to the gas passage, and the air outlet end of the ejector channel is connected to the air inlet, used to deliver a gas-air mixture into the burner bar. This invention enables more complete mixing of gas and air, resulting in more complete combustion and reduced nitrogen oxide emissions.

Description

Technical Field

[0001] This invention relates to the field of gas equipment technology, and particularly to a burner and gas equipment. Background Technology

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

[0003] In related technologies, gas nozzles are typically installed at intervals outside the air inlet of the burner. These nozzles inject gas into the burner, drawing in surrounding air to mix before it is ignited and discharged through the burner holes. However, this method of mixing gas and air inside the burner can lead to uneven gas-air mixing, resulting in incomplete combustion and higher nitrogen oxide emissions. Summary of the Invention

[0004] The main objective of this invention is to provide a burner that allows for thorough mixing of fuel gas and air before combustion, thereby reducing nitrogen oxide emissions.

[0005] To achieve the above objectives, the present invention provides a burner comprising:

[0006] Fire vent, the fire vent having an air inlet; and

[0007] An ejector device is installed at the air inlet of the burner. The ejector device has an ejector channel and a gas passage located outside the ejector channel. The ejector channel has an air inlet, an air outlet, and a gas inlet. The air inlet of the ejector channel is used to input air. The gas inlet is connected to the gas passage. The air outlet of the ejector channel is connected to the air inlet and is used to deliver a gas-air mixture into the burner.

[0008] In one embodiment of this application, the gas passage is arranged around the outer periphery of the ejector channel, and the gas inlet is located on the peripheral wall of the ejector channel and is positioned close to the gas inlet end.

[0009] In one embodiment of this application, the ejector channel includes an air inlet section, a first mixing section and a connecting section connected sequentially from the air inlet end to the air outlet end. The inlet end of the air inlet section is formed as the air inlet end, and the outlet end of the connecting section is formed as the air outlet end and is inserted into the air inlet.

[0010] At the connection between the intake section and the first mixing section, the cross-sectional area of ​​the first mixing section is increased or decreased relative to the cross-sectional area of ​​the intake section, and the gas inlet is located at the connection between the intake section and the first mixing section.

[0011] In one embodiment of this application, the cross-sectional area of ​​the first mixing section gradually decreases from the air intake section to the connecting section.

[0012] In one embodiment of this application, the cross-sectional area of ​​the connecting section remains unchanged and is consistent with the cross-sectional area of ​​the outlet end of the first mixing section.

[0013] In one embodiment of this application, the cross-sectional area of ​​the first mixing section increases abruptly relative to the cross-sectional area of ​​the intake section.

[0014] In one embodiment of this application, the cross-sectional area of ​​the first mixing section remains unchanged from the air intake section to the connecting section;

[0015] The cross-sectional area of ​​the connecting section gradually decreases in the direction away from the first mixing section.

[0016] In one embodiment of this application, the peripheral wall of the ejector channel is provided with at least one of the gas inlets;

[0017] And / or, the axis of the gas inlet is inclined to the axis of the ejector channel, and the opening of the gas inlet is oriented toward the air inlet.

[0018] In one embodiment of this application, the firebox is provided with an airflow channel, the airflow channel including a contraction section, a second mixing section and a diffuser section connected in sequence;

[0019] The contraction section is connected to the air inlet and is gradually narrowed from the air inlet in a direction away from the ejector channel; the cross-sectional area of ​​the second mixing section remains unchanged from the contraction section to the diffuser section; the diffuser section is gradually widened along the air inlet direction.

[0020] In one embodiment of this application, the cross-sectional area of ​​the flow at the outlet end of the contraction section is smaller than the cross-sectional area of ​​the flow at the outlet end of the ejector channel.

[0021] In one embodiment of this application, the ejector device and the fire bar are an integral structure.

[0022] To achieve the above objectives, this application also provides a gas-fired device, including a fan and a burner as described above, wherein the fan is used to drive air from the air inlet end into the ejector channel.

[0023] In the burner of this invention, an ejector device is installed at the air inlet of the burner. The ejector device has an ejector channel and a gas channel. When air is input from the air inlet of the ejector channel and flows toward the air outlet of the ejector channel, a negative pressure is generated at the gas inlet, which forms a suction force on the gas in the gas channel, thus ejecting the gas in the gas channel from the gas inlet into the ejector channel to mix with the air. The gas-air mixture mixed in the ejector channel can enter the burner from the air outlet and the air inlet of the burner to continue mixing. This extends the path of air-gas mixing, making the gas-air mixture more complete, enabling complete combustion, and reducing nitrogen oxide emissions. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of an embodiment of the burner of the present invention;

[0026] Figure 2 This is a schematic diagram of another embodiment of the burner of the present invention;

[0027] Figure 3 for Figure 1 A schematic diagram of the ejector device in the embodiment;

[0028] Figure 4 for Figure 3 Full sectional view of the embodiment;

[0029] Figure 5 for Figure 4 A magnified view of a section at point M;

[0030] Figure 6 for Figure 2 A schematic diagram of the ejector device in the embodiment;

[0031] Figure 7 for Figure 6 Full sectional view of the embodiment.

[0032] Explanation of icon numbers:

[0033]

[0034] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0036] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0037] Meanwhile, the meaning of "and / or" or "and / or" appearing throughout the text is that it includes three options. Taking "A and / or B" as an example, it includes option A, option B, or an option that satisfies both A and B.

[0038] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0039] In related technologies, gas nozzles are typically installed at intervals outside the burner intake. These nozzles inject gas into the burner, drawing in surrounding air from the gap between the intake and the nozzles to mix. However, in this method, the gas nozzles usually inject gas in a straight line from a single point in the center, and the air and gas need to enter the burner to mix. This results in a short mixing path, leading to uneven gas-air mixing, incomplete combustion, and higher nitrogen oxide emissions.

[0040] To address this, the present invention proposes a burner that, by installing an air-injector device at the air inlet of the burner, mixes the air and gas before they enter the burner. This extends the mixing path of the air and gas, improves the uniformity of the air-gas mixture, ensures complete combustion, and reduces nitrogen oxide emissions. The specific structure of the burner will be described below with reference to embodiments.

[0041] like Figures 1 to 4 As shown, the burner includes a burner 200 and an ejector device 100. The burner 200 has an air inlet 201, and the ejector device 100 is installed at the air inlet 201 of the burner 200. The ejector device 100 is provided with an ejector channel 11 and a gas passage 12 located outside the ejector channel 11. The ejector 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 ejector channel 11 is used to input air. The gas inlet 101 is connected to the gas passage 12. The air outlet end 11b of the ejector channel 11 is connected to the air inlet 201 and is used to deliver a gas-air mixture into the burner 200.

[0042] Understandably, the burner 200 has an airflow channel, with the air inlet 201 serving as the inlet of the airflow channel and the outlet of the airflow channel serving as the burner hole of the burner 200. By installing an ejector device 100 at the air inlet 201, which has an ejector channel 11 and a gas channel 12, air is input from the air inlet end 11a of the ejector channel 11. When the air flows toward the air outlet end 11b of the ejector channel 11, a negative pressure is generated at the gas inlet 101, which forms a suction force on the gas in the gas channel 12. This draws the gas in the gas channel 12 from the gas inlet 101 into the ejector channel 11 to mix with the air. The gas-air mixture, which has been initially mixed in the ejector channel 11, can enter the airflow channel from the air outlet end 11b and the air inlet 201 of the burner 200 for further mixing before being ejected from the burner hole and ignited.

[0043] It should be noted that in this embodiment, the air and gas are mixed before entering the burner 200, and continue to mix after entering the burner 200. Thus, compared with the method of setting gas nozzles at intervals on the outside of the air inlet 201 in related technologies, this embodiment can extend the mixing path of air and gas, so that the gas and air are mixed more thoroughly, can be fully combusted, and reduce nitrogen oxide emissions.

[0044] In practical applications, the ejector device 100 and the flame bar 200 can be connected by structural assembly methods, such as screw fixing, snap-fit ​​fixing, or plug-in fixing. Alternatively, the ejector device 100 and the flame bar 200 can be an integral structure, such as integral molding.

[0045] In the ejector device 100, the ejector channel 11 refers to the structure used to guide airflow and mix gas. Its inlet end 11a is used to input air, and its outlet end 11b is used to output the gas-air mixture. Specifically, it can be implemented using a variable-diameter or constant-diameter tubular structure, promoting the mixing of gas and air through an axial flow path. Optionally, the ejector device 100 is made of metal material, with the internally machined to form a cylindrical ejector channel 11. The gas channel 12 refers to the channel used to transport gas, which can be introduced into the ejector channel 11 through the gas inlet 101. The gas channel 12 can be implemented using an annular cavity or a separate pipe structure. Optionally, the gas channel 12 achieves physical isolation between gas and air through an external placement. Optionally, it can be a single annular gas channel 12 connecting all gas inlets 101, or it can be multiple independent gas channels 12 each connecting to their respective gas inlets 101. The gas inlet 101 refers to an opening or through-hole structure provided on the inner wall of the injection channel 11, which is used to introduce gas from the gas channel 12 into the injection channel 11. Specifically, it can be implemented by multiple independent holes or continuous annular holes.

[0046] In summary, in the burner of the present invention, an ejector device 100 is installed at the air inlet 201 of the burner 200. The ejector device 100 has an ejector channel 11 and a gas channel 12. When air is input from the air inlet 11a of the ejector channel 11 and flows toward the air outlet 11b of the ejector channel 11, a negative pressure is generated at the gas inlet 101, which forms a suction force on the gas in the gas channel 12, and the gas in the gas channel 12 is ejected from the gas inlet 101 into the ejector channel 11 to mix with the air. The gas-air mixture after mixing in the ejector channel 11 can enter the burner 200 from the air outlet 11b and the air inlet 201 of the burner 200 to continue mixing. Thus, the path of air and gas mixing is extended, making the gas and air mix more fully, enabling complete combustion and reducing nitrogen oxide emissions.

[0047] Please see Figure 3 , Figure 4 as well as Figure 7 In one embodiment of this 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 close to the inlet end 11a.

[0048] With this design, the gas can rotate three-dimensionally and diffuse evenly to all circumferential positions of the annular cavity within the gas channel 12, and be evenly delivered to multiple gas inlets 101 on the periphery of the ejector channel 11. This ensures that each gas inlet 101 can discharge gas into the ejector channel 11, avoiding the phenomenon of uneven mixing caused by local gas concentration.

[0049] The gas inlet 101 is positioned close to the air inlet 11a, allowing the gas to be introduced at the initial stage when air enters the ejector channel 11. This prolongs the mixing path and time of the gas and air within the ejector channel 11, ensuring sufficient diffusion and uniform mixing of the gas and air during flow. This design also extends the distance between the gas inlet 101 and the air inlet 201 of the burner 200, further extending the mixing length of the air and gas and preventing uneven concentration caused by insufficient mixing time.

[0050] Further, please refer to Figure 3 , Figure 4 as well as Figure 7 The ejector device 100 is provided with a gas inlet 102 that connects to the gas passage 12. The gas inlet 102 is used to connect to the gas inlet pipe 20. The gas inlet 102 and the gas inlet 101 are respectively located on both sides of the gas passage 12 in the axial direction.

[0051] Understandably, the inlet end of the gas inlet pipe 20 is used to connect to the gas pipe (or to a gas distribution rod structure connected to the gas pipe), and the outlet end of the gas inlet pipe 20 is connected to the gas inlet 102 of the gas passage 12, with the purpose of delivering gas into the gas passage 12. By setting the gas inlet 102 and the gas inlet 101 on opposite sides of the gas passage 12 in the axial direction, the flow path of the gas in the gas passage 12 is extended, allowing the gas to be arranged circumferentially around the ejector channel 11. After the gas enters the gas passage 12 from the gas inlet 102, it can flow axially to the area of ​​the gas inlet 101, forming an airflow direction opposite to the airflow direction in the ejector channel 11, and then enter the ejector channel 11 from the gas inlet 101, which can further increase the turbulence between the gas and the air, making the two mix more evenly.

[0052] Please see Figure 3 , Figure 4 , Figure 6 as well as Figure 7 In one embodiment of this application, the ejector channel 11 includes an intake section 111, a first mixing section 112, and a connecting section 114 connected sequentially from an intake end 11a to an outlet end 11b. The inlet end of the intake section 111 is formed as the intake end 11a, and the outlet end of the connecting 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 flow cross-sectional area of ​​the first mixing section 112 is increased or decreased relative to the flow cross-sectional area of ​​the intake section 111. The gas inlet 101 is provided at the connection between the intake section 111 and the first mixing section 112.

[0053] Understandably, the first mixing section 112 is located downstream of the intake section 111. The cross-sectional area of ​​the ejector channel 11 changes at the connection between the intake section 111 and the first mixing section 112. When the airflow flows from the intake section 111 to the first mixing section 112, the airflow will become turbulent at the connection between the intake section 111 and the first mixing section 112 because the cross-sectional area of ​​the first mixing section 112 changes suddenly relative to the cross-sectional area of ​​the intake section 111. By setting the gas inlet 101 at the connection between the intake section 111 and the first mixing section 112, the gas can be quickly mixed into the airflow at the connection when it enters the ejector channel 11, so that the gas and air are fully mixed.

[0054] It should be noted that in this embodiment, the cross-sectional area of ​​the ejector channel 11 changes at the connection between the intake section 111 and the first mixing section 112. This can be understood as the cross-sectional area of ​​the first mixing section 112 increasing or decreasing relative to the cross-sectional area of ​​the intake section 111. When it increases, the airflow will form a vortex at the point where the cross-sectional area changes, which can draw the fuel gas into the vortex and improve the uniformity of the fuel-air mixture. When it decreases, the airflow velocity at the point where the cross-sectional area changes will increase, resulting in a greater negative pressure and a stronger ejector force on the fuel gas, allowing more fuel gas to mix into the air and thus improving the fuel-air mixture.

[0055] The following will illustrate an implementation method in which the cross-sectional area of ​​the first mixing section 112 is reduced or increased relative to the cross-sectional area of ​​the intake section 111.

[0056] Please see Figure 3 and Figure 4 In one embodiment, the cross-sectional area of ​​the first mixing section 112 gradually decreases along the direction from the inlet end 11a to the outlet end 11b. In this embodiment, the cross-sectional area of ​​the first mixing section 112 is smaller than that of the inlet section 111, making the inner wall of the first mixing section 112 have a conical contraction structure. As the air flows through the ejector channel 11, the gradually decreasing cross-sectional area causes the fluid velocity to increase steadily, forming a stable negative pressure region in the first mixing section 112. This allows the fuel gas to be efficiently drawn into the ejector channel 11, while simultaneously accelerating the laminar mixing of the flowing air and the fuel gas.

[0057] Furthermore, in the direction from the first mixing section 112 to the outlet end 11b, the flow cross-sectional area of ​​the connecting section 114 remains unchanged and is consistent with the flow cross-sectional area at the outlet end of the first mixing section 112. It is understood that as the flow cross-sectional area of ​​the first mixing section 112 gradually decreases, the airflow 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, and ensuring that the flow cross-sectional area of ​​the connecting section 114 is consistent with that at the outlet end of the first mixing section 112, a smooth connection is achieved. Therefore, when the gas-air mixture flows from the first mixing section 112 to the connecting section 114, the mixed airflow can smoothly enter the connecting section 114. The constant flow cross-sectional area of ​​the connecting section 114 effectively buffers the mixed airflow, preventing uneven mixing due to excessive airflow velocity. Furthermore, the connecting section 114 maintains fluid flow stability, preventing pressure fluctuations or energy loss caused by sudden changes in cross-sectional area. In addition, the connecting section 114 can extend the mixing contact time of air and gas, effectively improving the uniformity of gas-air mixing.

[0058] Please see Figure 6 and Figure 7 In one embodiment, the cross-sectional area of ​​the first mixing section 112 increases abruptly relative to the cross-sectional area of ​​the intake section 111. In this embodiment, when the airflow 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 is formed at the point of abrupt change in cross-sectional area. This allows the fuel gas to be directly drawn into the vortex and mixed with the air when entering the first mixing section 112, resulting in more thorough mixing of the fuel gas and air. Simultaneously, it reduces the airflow velocity, prolongs the mixing contact time between the fuel gas and air in the first mixing section 112, and further improves 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 fuel gas inlet 101 is located at the step 113.

[0059] Furthermore, along the direction from the inlet end 11a to the outlet end 11b, the cross-sectional area of ​​the first mixing section 112 remains constant; the cross-sectional area of ​​the connecting section 114 gradually decreases in the direction away from the first mixing section 112. The airflow forms a vortex at the connection between the inlet section 111 and the first mixing section 112, allowing for thorough mixing of the fuel gas and air. Furthermore, by keeping the cross-sectional area of ​​the first mixing section 112 constant, the stability of the air-fuel mixture flow can be maintained, preventing pressure fluctuations or energy loss due to changes in the cross-sectional area within the first mixing section 112. Since the cross-sectional area of ​​the first mixing section 112 is larger than that of the inlet section 111, the airflow velocity within the first mixing section 112 decreases, and the mixing contact time between the air and fuel gas is prolonged, effectively improving the uniformity of the fuel gas-air mixture. Based on the reduced airflow velocity and uniform mixing, this embodiment provides a connecting section 114 at the outlet end of the first mixing section 112. The connecting section 114 is gradually narrowed in the direction away from the first mixing section 112, that is, the flow cross-sectional area of ​​the connecting section 114 gradually decreases in the direction towards the outlet end 11b. This can increase the flow velocity of the air-fuel mixture in the connecting section 114, so as to ensure the airflow intensity when the air-fuel mixture is injected into the burner 200 from the outlet end 11b.

[0060] Please see Figures 3 to 7 In one embodiment of this application, the gas inlet 101 is at least partially surrounded by the peripheral wall of the ejector channel 11.

[0061] By having the gas inlet 101 at least partially surround the periphery of the ejector channel 11, compared to the method of gas being injected from the center in a single stream in related technologies, this embodiment allows the gas to enter the air from the circumference of the ejector channel 11, increasing the contact area between the gas and the air, and increasing the part of the gas entering the air, which can effectively improve the uniformity of gas-air mixing.

[0062] In practical applications, the shape and structure of the gas inlet 101 can be determined according to the actual situation.

[0063] Please see Figures 3 to 5 In one embodiment, the gas inlet 101 has a plurality of gas inlets 101, which are distributed at circumferential intervals along the ejector channel 11.

[0064] Understandably, the spaced distribution of multiple gas inlets 101 divides the gas into multiple independent airflows, which are injected into the ejector channel 11 at different angles, forming a more thorough and continuous contact with the air flowing within the ejector channel 11. This further improves the mixing efficiency and uniformity of the gas and air. This design avoids the problems of local gas accumulation or uneven distribution that may occur with a single gas inlet.

[0065] Optionally, the gas inlet 101 can be a circular hole, a square hole, a triangular hole, or some irregularly shaped hole.

[0066] Please see Figure 6 and Figure 7 In one embodiment, the gas inlet 101 is an annular hole surrounding the periphery of the ejector channel 11.

[0067] By setting the gas inlet 101 as an annular hole structure, the gas can be uniformly introduced into the ejector channel 11 along the entire annular cross section to mix with the air, thus eliminating the airflow gaps between local areas.

[0068] In addition, the gas is uniformly injected into the ejector channel 11 from the annular hole in the whole circumference, forming an annular contact surface with the axially flowing air. This achieves continuous mixing of gas and air in the circumferential dimension, increases the contact area between gas and air, and causes the air and gas to mix turbulently in the ejector channel 11, thereby improving the mixing uniformity.

[0069] In one embodiment, there are multiple gas inlets 101, which are spaced apart along the axial direction of the ejector channel 11. This design increases the ejector area for gas to enter the air, resulting in a more uniform mixture of gas and air.

[0070] Please see Figure 5 and Figure 7 In one embodiment of this application, the axis of the gas inlet 101 is inclined to the axis of the ejector channel 11, and the opening of the gas inlet 101 is set toward the air inlet 201 of the burner 200.

[0071] By designing the axis of the gas inlet 101 to be inclined at an angle to the axis of the ejector channel 11, the gas jet forms axial and radial velocities along the ejector channel 11. The axial velocity is in the same direction as the airflow, avoiding direct impact of the gas flow on the wall of the ejector channel 11 and causing turbulence losses. The radial velocity promotes the diffusion distribution of the gas on the cross-section of the ejector channel 11. By setting the opening of the gas inlet 101 towards the air inlet 201 of the burner 200, the direction of the gas jet is aligned with the overall movement direction of the mixed airflow. The kinetic energy of the airflow within the ejector channel 11 is used to accelerate the mixing of the gas, while the swirling effect generated by the inclined injection increases the contact area between the gas and the air.

[0072] This design avoids both the kinetic energy cancellation caused by the gas injection direction being completely perpendicular to the airflow direction, and the problem of insufficient gas diffusion when the two are completely parallel.

[0073] Please see Figure 1 and Figure 2In one embodiment of this application, the burner 200 is provided with an airflow channel, 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 gradually narrowed from the air inlet 201 in a direction away from the ejector channel 11; 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 gradually widened along the air intake direction.

[0074] In this embodiment, the airflow channel is sequentially connected at the air inlet 201 to a contraction section 210, a second mixing section 220, and a diffuser section 230. The contraction section 210 is gradually narrowed along the air intake direction, and the second mixing section 220 connects the contraction section 210 and the diffuser section 230. The cross-sectional area of ​​the second mixing section 220 remains constant from the contraction section 210 to the diffuser section 230, while the diffuser section 230 gradually expands along the air intake direction. Therefore, when the air-fuel mixture is injected into the contraction section 210 from the outlet 11b of the ejector channel 11, the gradually narrowing design of the contraction section 210 increases the velocity of the mixed airflow, improving the ejection effect. After mixing in the second mixing section 220, the mixed airflow enters the diffuser section 230, where the dynamic pressure changes to static pressure, increasing the pressure of the mixed gas and further homogenizing the air and fuel mixture.

[0075] Please see Figures 1 to 3 In one embodiment of this application, the cross-sectional area of ​​the flow at the outlet end of the contraction section 210 is smaller than the cross-sectional area of ​​the flow at the outlet end 11b of the ejector channel 11. This design further extends the ejector path, resulting in better air-fuel mixing, more uniform fuel concentration distribution, and better combustion emission performance.

[0076] Taking the first mixing section 112 as a gradually narrowing configuration as an example, combined with the gradually narrowing contraction section 210 of the burner 200, there are at least two narrowings in the airflow path. The air-fuel mixture will sequentially 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 before being ejected from the burner hole. In this way, the air and fuel flow will pass through multiple different flow cross-sections and be subject to different pressure changes, achieving a better mixing effect.

[0077] The present invention also proposes a gas-fired device, which includes a fan and a burner. The specific structure of the burner is as described in the above embodiments. Since this gas-fired device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. The fan is used to drive air from the air inlet 11a into the ejector channel 11.

[0078] Alternatively, the gas-fired equipment can be a gas water heater, a gas-fired wall-hung boiler, a boiler, etc.

[0079] Alternatively, the gas equipment can be a forced-draft gas equipment or a forced-extraction gas equipment.

[0080] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A burner, characterized in that, include: A burner, wherein the burner has an air inlet; and An ejector device is installed at the air inlet of the burner. The ejector device has an ejector channel and a gas passage located outside the ejector channel. The ejector channel has an air inlet end, an air outlet end, and a gas inlet. The air inlet end of the ejector channel is used to input air. The gas inlet is connected to the gas passage and is located on the peripheral wall of the ejector channel. The air entering from the air inlet end ejects the gas from the gas inlet into the ejector channel. The air outlet end of the ejector channel is connected to the air inlet and is used to deliver a gas-air mixture into the burner. The exhaust end of the ejector device is fixed inside the air inlet of the fire bar.

2. The burner as described in claim 1, characterized in that, The gas passage is arranged around the outer periphery of the ejector passage and is located near the air inlet end.

3. The burner as described in claim 2, characterized in that, The ejector channel includes an air intake section, a first mixing section, and a connecting section connected sequentially from the air intake end to the air outlet end. The inlet end of the air intake section is formed as the air intake end, and the outlet end of the connecting section is formed as the air outlet end and is inserted into the air intake port. At the connection between the intake section and the first mixing section, the cross-sectional area of ​​the first mixing section is increased or decreased relative to the cross-sectional area of ​​the intake section, and the gas inlet is located at the connection between the intake section and the first mixing section.

4. The burner as described in claim 3, characterized in that, The cross-sectional area of ​​the first mixing section gradually decreases from the intake section to the connecting section.

5. The burner as described in claim 4, characterized in that, The cross-sectional area of ​​the connecting section remains unchanged and is consistent with the cross-sectional area of ​​the outlet end of the first mixing section.

6. The burner as claimed in claim 3, characterized in that, The cross-sectional area of ​​the first mixing section increases abruptly relative to the cross-sectional area of ​​the intake section.

7. The burner as claimed in claim 6, characterized in that, The cross-sectional area of ​​the first mixing section remains unchanged from the intake section to the connecting section; The cross-sectional area of ​​the connecting section gradually decreases in the direction away from the first mixing section.

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

9. The burner according to any one of claims 1 to 7, characterized in that, The fire bar is provided with an airflow channel, which 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 gradually narrows from the air inlet in a direction away from the ejector channel; the cross-sectional area of ​​the second mixing section remains unchanged from the contraction section to the diffuser section; The diffuser section is gradually widened along the intake direction.

10. The burner as claimed in claim 9, characterized in that, The cross-sectional area of ​​the flow at the outlet end of the contraction section is smaller than the cross-sectional area of ​​the flow at the outlet end of the ejector channel.

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

12. A gas-fired device, characterized in that, Includes a fan and a burner as described in any one of claims 1 to 11, wherein the fan is used to drive air from the air inlet end into the ejector channel.

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