Ejector, combustor and gas appliance

Abstract

The application discloses an ejector device, a combustor and a gas equipment, and relates to the technical field of combustors. The ejector device comprises a main body, the main body is provided with an ejecting channel and a gas channel, the gas channel is located outside the ejecting channel, the ejecting channel is provided with an air inlet end, an air outlet end and a gas inlet, the air inlet end of the ejecting channel is used for inputting air, the gas inlet is communicated with the gas channel, and the air outlet end of the ejecting channel is used for outputting a gas-air mixture; wherein the circumferential wall of the ejecting channel is provided with at least one gas inlet. The technical scheme can improve the mixing uniformity of the gas and the air, the combustor can be fully combusted, and the emission of carbon monoxide and nitrogen oxides is reduced.

Description

Technical Field

[0001] This invention relates to the field of burner technology, and in particular to an ejector device, a burner, and a gas equipment. Background Technology

[0002] The burner is an important component of gas equipment.

[0003] In related technologies, a gas nozzle is typically installed at the air inlet of the burner. This nozzle injects gas into the burner's air inlet to draw air in, where it mixes and is then discharged through the burner orifice for combustion. However, this gas-air premixing method results in uneven mixing of the gas and air within the burner, leading to incomplete combustion and the production of higher levels of carbon monoxide and nitrogen oxides. Summary of the Invention

[0004] The main objective of this invention is to provide an ejector device that improves the uniformity of gas-air mixing, enabling the burner to achieve complete combustion and reducing emissions of carbon monoxide and nitrogen oxides.

[0005] To achieve the above objectives, the present invention proposes an ejector device comprising a main body, wherein the main body is provided with an ejector channel and a gas channel, and the gas channel is located outside the ejector channel;

[0006] The ejector channel is provided with 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 channel, and the air outlet of the ejector channel is used to output a gas-air mixture.

[0007] The ejector channel has at least one gas inlet on its peripheral wall.

[0008] In one embodiment of this application, there are at least two gas inlets, and the at least two gas inlets are distributed at circumferential intervals along the ejector channel;

[0009] Alternatively, the gas inlet is an annular hole surrounding the periphery of the ejector channel;

[0010] Alternatively, there may be at least two gas inlets, which are arranged at an axial distance from each other along the ejector channel.

[0011] In one embodiment of this application, the axis of the gas inlet is inclined relative to the axis of the ejector channel, and the opening of the gas inlet is oriented toward the gas outlet end of the ejector channel.

[0012] In one embodiment of this application, the flow area of ​​the ejector channel gradually decreases or remains unchanged from the air inlet end to the air outlet end of the ejector channel.

[0013] In one embodiment of this application, the ejector channel includes an air intake section and a mixing section connected sequentially along the air intake direction. 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.

[0014] The gas inlet is located in the mixing section near the step.

[0015] In one embodiment of this application, the gas inlet is located at the connection between the mixing section and the air intake section;

[0016] The step has a guide ramp on the side facing the gas inlet.

[0017] In one embodiment of this application, the gas inlet is located near the gas inlet end of the ejector channel.

[0018] In one embodiment of this application, the gas passage is arranged around the outer periphery of the ejector channel, and the gas passage extends axially from one end of the ejector channel to the other end.

[0019] In one embodiment of this application, the ejector device further includes a gas inlet pipe connected to the main body, and the gas passage is provided with a gas inlet communicating with the gas inlet pipe. The gas inlet is located at one end of the gas passage axially away from the gas inlet.

[0020] To achieve the above objectives, this application also provides a burner, including a burner body and the aforementioned ejector device, wherein the outlet end of the ejector device is used to connect with the inlet of the burner body.

[0021] To achieve the above objectives, this application also provides a gas-fired device, including a fan and the aforementioned burner, wherein the fan is used to drive air from the air inlet end of the ejector device into the ejector channel.

[0022] The technical solution of this invention introduces air from the inlet end of the ejector channel. When the air flows towards the outlet end of the ejector channel, it generates a negative pressure at the gas inlet, creating a suction force on the gas in the gas channel. This allows the gas in the gas channel to be ejected from the gas inlet into the ejector channel and mixed with the air. By setting at least one gas inlet on the circumferential wall of the ejector channel, compared with the method of gas being injected from the center in related technologies, this embodiment allows the gas to enter the air from the circumference of the ejector channel, increasing the contact area between the gas and the air, and also increasing the part of the gas entering the air, which can effectively improve the uniformity of gas-air mixing. Attached Figure Description

[0023] 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.

[0024] Figure 1 This is a schematic diagram of the structure of an embodiment of the ejector device of the present invention;

[0025] Figure 2 for Figure 1 Full sectional view of the embodiment;

[0026] Figure 3 for Figure 2 A magnified view of a section at point M;

[0027] Figure 4 This is a schematic diagram of another embodiment of the ejector device of the present invention;

[0028] Figure 5 for Figure 4 Full sectional view of the embodiment;

[0029] Figure 6 This is a schematic diagram of the structure of an embodiment of the burner of the present invention.

[0030] Explanation of icon numbers:

[0031]

[0032] 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

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] In related technologies, a gas nozzle is typically installed at the air inlet of the burner. This nozzle injects gas into the burner's air inlet to draw air in, which then mixes with the gas before it is discharged from the burner orifice for combustion. However, this method of injecting air in a single-point, straight line may result in insufficient air intake and uneven mixing of the gas and air within the burner, easily leading to incomplete combustion and the production of excessive amounts of carbon monoxide and nitrogen oxides.

[0038] Therefore, this invention proposes an ejector device for use in gas-fired equipment. Air is driven into the ejector device by a fan in the gas-fired equipment to eject the gas. The device has at least one gas inlet to increase the coverage area of ​​the gas entering the air, improve the uniformity of gas-air mixing, ensure complete combustion in the burner, and reduce nitrogen oxide emissions. The specific structure of the ejector device will be described below with reference to embodiments.

[0039] like Figures 1 to 5 As shown, the ejector device 100 includes a main body 10, which has an ejector channel 11 and a gas channel 12. The gas channel 12 is located outside the ejector channel 11. The ejector channel 11 has an air inlet 11a, an air outlet 11b, and a gas inlet 101. The air inlet 11a of the ejector channel 11 is used to input air, the gas inlet 101 is connected to the gas channel 12, and the air outlet 11b of the ejector channel 11 is used to output a gas-air mixture. The peripheral wall of the ejector channel 11 has at least one gas inlet 101.

[0040] Understandably, the ejector channel 11 refers to a cylindrical structure used to guide airflow and mix combustion gas. Its inlet end 11a is used to input air, and its outlet end 11b is used to output the combustion gas-air mixture. Specifically, it can be implemented using a tubular structure with varying or equal diameters. The axial flow path promotes the mixing of combustion gas and air. Optionally, the main body 10 of the ejector device 100 is made of metal material, and the cylindrical ejector channel 11 is formed internally.

[0041] The gas passage 12 refers to an independent cavity structure located outside the ejector passage 11, used to store and transport gas. Specifically, it can be implemented as an annular cavity or a separate pipe structure, achieving physical isolation between the gas and air through external placement. Optionally, it can be an annular gas passage 12 connecting all gas inlets 101, or it can be multiple independent gas passages 12 each connecting to their respective gas inlets 101.

[0042] The gas inlet 101 refers to the opening or through hole structure set on the periphery of the ejector channel 11, which is used to introduce gas from the gas channel 12 into the ejector channel 11. Specifically, it can be achieved by multiple independent holes or continuous annular holes, so that the gas can enter the air flow field from different angles and improve the uniformity of gas-air mixing.

[0043] In this embodiment, air is input from the inlet 11a of the ejector channel 11. When the air flows toward the 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. This draws the gas in the gas channel 12 into the ejector channel 11 from the gas inlet 101 and mixes it with the air. Furthermore, since the peripheral wall of the ejector channel 11 is provided with at least one gas inlet 101, compared with the method of gas being injected from the middle in the related art, this embodiment allows the gas to enter the air from the circumference of the ejector channel 11, which increases the contact area between the gas and the air and increases the part of the gas entering the air, thereby effectively improving the uniformity of the mixing of gas and air.

[0044] In practical applications, the shape and structure of the gas inlet 101 can be determined according to the actual situation.

[0045] Please see Figures 1 to 3 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.

[0046] Understandably, multiple spaced gas inlets 101 divide 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 localized gas accumulation or uneven distribution that may occur with a single gas inlet. Optionally, the multiple gas inlets 101 are arranged in a ring array.

[0047] Optionally, the gas inlet 101 can be a circular hole, a square hole, a triangular hole, or some irregularly shaped hole.

[0048] Please see Figure 4 and Figure 5 In one embodiment, the gas inlet 101 is an annular hole surrounding the periphery of the ejector channel 11.

[0049] 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 blank area between local air inlets.

[0050] 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.

[0051] 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.

[0052] Please see Figure 2 , Figure 3 as well as Figure 5 In one embodiment of this application, the axis of the gas inlet 101 is inclined relative to the axis of the ejector channel 11, and the opening of the gas inlet 101 is directed toward the gas outlet 11b of the ejector channel 11.

[0053] 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 outlet end 11b, 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.

[0054] 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.

[0055] Please see Figure 2 In one embodiment of this application, the flow area of ​​the ejector channel 11 gradually decreases from the air inlet 11a to the air outlet 11b. This design results in a tapered constriction structure on the inner wall of the ejector channel 11. As air flows through the ejector channel 11, the gradually decreasing flow area causes the fluid velocity to increase smoothly, forming a stable negative pressure region in the 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.

[0056] In other embodiments of this application, the flow area of ​​the ejector channel 11 remains unchanged from the air inlet 11a to the air outlet 11b. In this embodiment, the constant flow area of ​​the ejector channel 11 maintains fluid flow stability and avoids pressure fluctuations or energy loss caused by sudden changes in cross-sectional area.

[0057] Please see Figure 4 and Figure 5 In one embodiment of this application, the ejector channel 11 includes an air intake section 111 and a mixing section 112 connected sequentially along the air intake direction. The inner diameter of the mixing section 112 is larger than the inner diameter of the air intake section 111, so that a step 113 is formed at the connection between the mixing section 112 and the air intake section 111. The gas inlet 101 is located in the area of ​​the mixing section 112 near the step 113.

[0058] In this embodiment, by dividing the ejector channel 11 into an intake section 111 and a mixing section 112, and utilizing the design that the inner diameter of the mixing section 112 is larger than that of the intake section 111, a step 113 is formed 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, the airflow forms a vortex region at the step 113. The fuel gas is introduced from the area of ​​the mixing section 112 near the step 113 and is directly drawn into the center of the airflow by the negative pressure generated by the vortex, which avoids the fuel gas being concentrated in a single direction or area and improves the uniformity of air-fuel mixing.

[0059] In addition, the enlarged inner diameter of the mixing section 112 can reduce the airflow velocity, prolong the contact time between the gas and air in the mixing section 112, and further improve the mixing uniformity.

[0060] Further, please refer to Figure 5 The gas inlet 101 is located at the connection between the mixing section 112 and the air intake section 111; the step 113 has a guide slope on the side facing the gas inlet 101.

[0061] As can be seen from the foregoing embodiments, air generates a vortex when passing through step 113. By placing the gas inlet 101 at the connection between the mixing section 112 and the intake section 111, the gas can be drawn into the vortex and mixed with the air when entering the mixing section 112, thus improving the mixing uniformity. In practical applications, the gas inlet 101 can be configured as an annular hole at the connection between the mixing section 112 and the intake section 111 or distributed circumferentially.

[0062] Furthermore, by providing a guide slope on the side of step 113 facing the gas inlet 101, the gas is guided to enter the ejector channel 11 along the slope, which can guide the airflow to form a spiral motion trajectory. During the spiral motion, the gas collides and mixes with the air multiple times, improving the mixing uniformity. Further, the guide slope can direct the gas flow towards the outlet end 11b of the ejector channel 11, preventing backflow of gas and improving ejection efficiency.

[0063] Please see Figures 1 to 5 In one embodiment of this application, the gas inlet 101 is located near the gas inlet end 11a of the ejector channel 11.

[0064] By positioning the gas inlet 101 close to the air inlet end 11a of the ejector channel 11, the gas is introduced at the initial stage when air enters the ejector channel 11, extending the mixing path and time of the gas and air within the ejector channel 11. This allows for sufficient diffusion and uniform mixing of the gas and air during the flow process. This design avoids localized uneven concentrations caused by insufficient mixing time between the gas and air, thereby improving the completeness of subsequent combustion and reducing the generation of carbon monoxide and nitrogen oxides.

[0065] Please see Figure 2 and Figure 5 In one embodiment of this application, the gas passage 12 is arranged around the outer periphery of the ejector passage 11, and the gas passage 12 extends from one end of the ejector passage 11 axially to the other end.

[0066] Understandably, the gas passage 12 can be configured as an annular cavity structure coaxial with the ejector passage 11. The inner wall of the annular cavity forms a sealed connection with the outer wall of the ejector passage 11. The gas inlet 101 penetrates the inner and outer walls of the ejector passage 11, so that the gas passage 12 is connected to the ejector passage 11.

[0067] The gas passage 12 surrounds the outer periphery of the ejector passage 11, so that the gas passage 12 covers the entire outer periphery of the ejector passage 11. The gas can rotate three-dimensionally and diffuse evenly to each circumferential position of the annular cavity within the gas passage 12, and be evenly delivered to multiple gas inlets 101 on the periphery of the ejector passage 11. This ensures that each gas inlet 101 can discharge gas into the ejector passage 11, avoiding the phenomenon of uneven mixing caused by local gas concentration.

[0068] In addition, the gas passage 12 extends from one end of the ejector passage 11 to the other in the axial direction, which can prolong the flow path of the gas in the gas passage 12, so that the gas has a sufficient time and path to flow around the ejector passage 11, ensuring the uniformity of the gas exiting the gas inlet 101 in the circumference of the ejector passage 11, and further improving the uniformity of gas and air mixing.

[0069] Please see Figures 1 to 5 In one embodiment of this application, the ejector device 100 further includes a gas inlet pipe 20 connected to the main body 10, and the gas passage 12 is provided with a gas inlet 102 communicating with the gas inlet pipe 20. The gas inlet 102 is located at one end of the gas passage 12 that is axially away from the gas inlet port 101.

[0070] Understandably, the inlet end of the gas inlet pipe 20 is used to connect to the gas pipe (or to the 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 of the main body 10. By setting the gas inlet 102 at one end of the gas passage 12 axially away from the gas inlet 101, 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.

[0071] Furthermore, since the gas inlet 101 in the aforementioned embodiment is located near the air inlet end 11a of the ejector channel 11, the gas inlet 102 is located near the air outlet end 11b of the ejector channel 11. Thus, after the gas enters the gas channel 12 from the gas inlet 102, it can flow axially to the gas inlet 101 region, 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. This can further increase the turbulence between the gas and the air, making the two mix more evenly.

[0072] Please see Figures 1 to 6 In one embodiment of this application, the main body 10 is provided with a connecting section 13 at the air outlet 11b of the ejector channel 11, and the connecting section 13 is used to connect with the air inlet of the burner.

[0073] When the ejector device 100 is used in a burner, the outlet end 11b of the ejector device 100 needs to be aligned with the air inlet of the burner so that the gas-air mixture can be smoothly injected into the burner. In this embodiment, a connecting section 13 is provided at the outlet end 11b of the main body 10, and the air inlet of the burner is connected to the air inlet of the burner through the connecting section 13. Optionally, the connecting section 13 can be annular, and its inner cavity is connected to the outlet end 11b of the ejector channel 11. The connecting section 13 and the air inlet of the burner can be assembled by insertion, welding, or some other method.

[0074] Please see Figures 1 to 5 In one embodiment of this application, the ejector device 100 is a one-piece molded structure, which simplifies the manufacturing process and improves production efficiency. Optionally, the ejector device 100 is integrally molded using a mold.

[0075] The present invention also proposes a burner, please refer to [link / reference]. Figure 6 The burner includes a burner body 200 and an ejector device 100. The specific structure of the ejector device 100 is as described in the above embodiments. Since this burner 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. Among them, the air outlet end 11b of the ejector device 100 is used to connect with the air inlet of the burner body 200.

[0076] Optionally, the port of the outlet end 11b of the ejector device 100 may be directly connected to the air inlet of the burner body 200, or the connecting section 13 at the outlet end 11b may be connected to the air inlet of the burner body 200.

[0077] Alternatively, assembly can be achieved through plug-in assembly, welding assembly, or some other method.

[0078] This 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 elaborated here. The fan is used to drive air from the air inlet end of the ejector device into the ejector channel.

[0079] Alternatively, the gas-fired equipment can be a gas water heater, a gas-fired wall-hung boiler, a boiler, etc.

[0080] Alternatively, the gas equipment can be a forced-draft gas equipment or a forced-extraction gas equipment.

[0081] 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. An ejector device, characterized in that, The device is applied to a gas-fired appliance, which has a fan; the ejector includes a main body, which has an ejector channel and a gas channel, the gas channel being located outside the ejector channel; The ejector channel is provided with an air inlet, an air outlet, and a gas inlet. The fan is used to drive air from the air inlet into the ejector channel. The gas inlet is connected to the gas channel. The air entering from the air inlet will eject the gas from the gas inlet into the ejector channel. The air outlet of the ejector channel is used to output the gas-air mixture. The peripheral wall of the ejector channel shall have at least one gas inlet. The gas inlet is located near the inlet end of the ejector channel, and the flow area of ​​the ejector channel gradually decreases or remains unchanged from the gas inlet to the outlet end of the ejector channel.

2. The ejector device as claimed in claim 1, characterized in that, The gas inlet has at least two, and the at least two gas inlets are distributed at circumferential intervals along the ejector channel; Alternatively, the gas inlet is an annular hole surrounding the periphery of the ejector channel; Alternatively, there may be at least two gas inlets, which are arranged at an axial distance from each other along the ejector channel.

3. The ejector device as described in claim 1, characterized in that, The axis of the gas inlet is inclined relative to the axis of the ejector channel, and the opening of the gas inlet faces the gas outlet of the ejector channel.

4. The ejector device as claimed in claim 1, characterized in that, The ejector channel includes an air intake section and a mixing section connected sequentially along the air intake direction. 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 located in the mixing section near the step.

5. The ejector device as described in claim 4, characterized in that, The gas inlet is located at the connection between the mixing section and the air intake section; The step has a guide ramp on the side facing the gas inlet.

6. The ejector device according to any one of claims 1 to 5, characterized in that, The gas passage is arranged around the outer periphery of the ejector channel, and the gas passage extends from one end of the ejector channel to the other end in the axial direction.

7. The ejector device as claimed in claim 6, characterized in that, The ejector device also includes a gas inlet pipe connected to the main body, and the gas passage is provided with a gas inlet communicating with the gas inlet pipe. The gas inlet is located at one end of the gas passage that is axially opposite to the gas inlet.

8. A burner, characterized in that, It includes a burner body and an ejector device as described in any one of claims 1 to 7, wherein the outlet end of the ejector device is used to connect with the inlet of the burner body.

9. A gas-fired device, characterized in that, It includes a fan and a burner as described in claim 8, wherein the fan is used to drive air from the air inlet end of the ejector device into the ejector channel.

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