Gashybrid mixer

Abstract

This invention discloses a counter-current gas mixer. The counter-current gas mixer includes a gas mixer body, which comprises a shell and a mixing chamber enclosed by the shell. The shell has an outlet structure and multiple inlet structures communicating with the mixing chamber. The multiple inlet structures are distributed around the mixing chamber, each inlet structure including multiple air holes. Each air hole includes a guide channel and an inlet and an outlet located at opposite ends of the guide channel. The axial directions of the outlets of at least a selected number of air holes intersect or coincide with each other, and these selected air holes belong to different inlet structures. This invention provides an array of small-hole counter-current gas mixers that enables pre-mixing of multiple gases before the combustion chamber, reducing the obstruction of low-mixing-uniformity gases to the stable propagation of detonation waves.

Description

Technical Field

[0001] This invention specifically relates to a counter-current gas mixer, belonging to the field of power technology. Background Technology

[0002] Gas mixers are used in applications involving the mixing of two gases or the mixing of atomized liquids and gases. In combustion-related fields such as air-breathing engines, rocket engines, and heavy-duty gas turbines, gas mixers play a crucial role in thoroughly mixing fuel and oxidizer. The uniformity of fuel-oxidizer mixing affects the combustion quality in the combustion chamber. Unmixed combustion gases can lead to localized uneven combustion, resulting in energy loss and reduced fuel efficiency. In the research field of rotating detonation engine technology, engineering studies typically employ non-premixed intake structures to prevent backfire; however, in mechanistic studies, premixed combustion gases can also be used as fuel to comprehensively evaluate the performance of detonation engines. Summary of the Invention

[0003] The main objective of this invention is to provide a counter-current gas mixer, thereby overcoming the shortcomings of the prior art.

[0004] To achieve the aforementioned objectives, the technical solution adopted by this invention includes:

[0005] This invention provides a counter-current gas mixer, including a gas mixer body. The gas mixer body includes a shell and a mixing chamber formed by the shell. The shell is provided with an outlet structure and a plurality of inlet structures that communicate with the mixing chamber.

[0006] Multiple air intake structures are distributed around the mixing chamber. Each air intake structure includes multiple air holes. Each air hole includes an air guide channel and an air inlet and an air outlet located at both ends of the air guide channel. The axial directions of the air outlets of at least a selected plurality of air holes intersect or coincide with each other. The selected plurality of air holes belong to different air intake structures.

[0007] This invention also provides an engine including the aforementioned counter-current gas mixer.

[0008] Compared with the prior art, the advantages of the present invention include:

[0009] 1) The counter-current gas mixer provided in this embodiment of the invention can make the fuel gas and oxidant gas fully mixed in the premixer before entering the combustion chamber, so that the composition of the mixed gas entering the combustion chamber is uniform, which is conducive to the successful initiation of the detonation engine and the stable self-sustaining propagation of the detonation wave.

[0010] 2) The combustion chamber structure of a novel rotating detonation engine based on a counter-current gas mixer provided in the embodiments of the present invention can be greatly simplified and the thrust-to-weight ratio of the engine can be improved. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of a counter-current gas mixer provided in a typical embodiment of the present invention;

[0012] Figure 2 This is an exploded structural diagram of a counter-current gas mixer provided in a typical embodiment of the present invention;

[0013] Figure 3 This is an exploded structural diagram of a counter-current gas mixer provided in a typical embodiment of the present invention;

[0014] Figure 4 This is a schematic diagram of the internal structure of a counter-current gas mixer provided in a typical embodiment of the present invention;

[0015] Figure 5a and Figure 5b This is a schematic diagram of the main body of a gas mixer body provided in Embodiment 1 of the present invention;

[0016] Figure 6a and Figure 6b This is a schematic cross-sectional view of the main body of a gas mixer body provided in Embodiment 1 of the present invention;

[0017] Figure 7a and Figure 7b This is a schematic cross-sectional view of the main body of a gas mixer body provided in Embodiment 2 of the present invention;

[0018] Figure 8a and Figure 8b These are schematic cross-sectional views of the main body of a gas mixer body provided in Embodiments 3 and 4 of the present invention.

[0019] Figure 9a , Figure 9b , Figure 9c These are schematic diagrams showing the arrangement of multiple air holes in the air inlet structure of a counter-current gas mixer provided in a typical embodiment of the present invention.

[0020] Figure 10 This is a schematic diagram of the principle structure of a counter-current gas mixer provided in a typical embodiment of the present invention;

[0021] Figure 11 This is a schematic diagram of the structure of a counter-current gas mixer and a combustion chamber provided in a typical embodiment of the present invention. Detailed Implementation

[0022] In view of the shortcomings of the prior art, the inventors of this invention, through long-term research and extensive practice, have proposed the technical solution of this invention. The following will further explain and illustrate this technical solution, its implementation process, and its principles.

[0023] This invention is mainly aimed at premixed rotary detonation engines, and provides an array of small-hole counter-current gas mixer to premix multiple gases before the combustion chamber, which can reduce the obstruction effect of low-mixing-uniformity gases on the stable propagation of detonation waves.

[0024] The present invention provides a counter-current gas mixer that can be applied to both air-breathing engines that use air as an oxidizer and rocket engines that have their own oxidizer.

[0025] This invention provides a counter-current gas mixer, including a gas mixer body. The gas mixer body includes a shell and a mixing chamber formed by the shell. The shell is provided with an outlet structure and a plurality of inlet structures that communicate with the mixing chamber.

[0026] Multiple air intake structures are distributed around the mixing chamber. Each air intake structure includes multiple air holes. Each air hole includes an air guide channel and an air inlet and an air outlet located at both ends of the air guide channel. The axial directions of the air outlets of at least a selected plurality of air holes intersect or coincide with each other. The selected plurality of air holes belong to different air intake structures.

[0027] In some specific embodiments, the air inlet and air outlet of each of the air holes are arranged coaxially.

[0028] In some specific embodiments, the air inlet, air guide channel and air outlet of each of the air holes are arranged coaxially.

[0029] In some specific embodiments, the area of ​​the air inlet is greater than or equal to the area of ​​the air outlet.

[0030] In some specific embodiments, the inner wall of the air guide channel is a continuous curved surface.

[0031] In some specific embodiments, the central angle corresponding to any region of the inner wall of the air guide channel is greater than or equal to 90°.

[0032] In some specific embodiments, the multiple air holes included in the air intake structure are arranged in parallel along their axial directions.

[0033] In some specific embodiments, the angle between the axial direction of the air outlet of the air hole and the axial direction of the mixing chamber is 30-90°, preferably 90°.

[0034] In some specific embodiments, the structures of the multiple air holes in each of the aforementioned air intake structures are identical.

[0035] In some specific embodiments, the structures of the multiple air holes in the multiple air intake structures are all the same.

[0036] In some specific embodiments, the multiple air holes included in each of the air intake structures are arranged in an array.

[0037] In some specific embodiments, the pore diameter is 0.3-1.5 mm, preferably 0.3-0.8 mm, and the length-to-diameter ratio (length / pore diameter) of the pore is below 8, so as to prevent excessive gas loss along the pipe due to excessively long rough pipe walls, which would reduce momentum too much and reduce the mixing effect.

[0038] In some specific embodiments, some of the air holes of the plurality of air inlet structures are at the same height along the axial direction of the mixing chamber.

[0039] In some specific embodiments, the multiple air intake structures are at the same height along the axial direction of the mixing chamber.

[0040] In some specific embodiments, the angle between any two air intake structures in the circumferential direction surrounding the mixing chamber is greater than 0° and less than or equal to 180°, preferably greater than 90° and less than or equal to 180°.

[0041] In some specific embodiments, multiple air intake structures are arranged at equal angles in the circumferential direction surrounding the mixing chamber.

[0042] In some specific embodiments, multiple intake structures have the same structure.

[0043] In some specific implementations, the multiple air holes of any two air intake structures correspond one-to-one.

[0044] In some specific embodiments, the inner wall of the mixing chamber is a continuous curved surface.

[0045] In some specific embodiments, the central angle corresponding to any region of the inner wall of the mixing chamber is greater than or equal to 90°.

[0046] In some specific embodiments, the cross-sectional area of ​​the mixing chamber near the air inlet structure is larger than the cross-sectional area near the air outlet structure.

[0047] In some specific embodiments, the mixing chamber includes a first chamber, a second chamber, and a third chamber that are sequentially and smoothly connected along its own axis. A plurality of the air intake structures are arranged around the first chamber and directly connected to the first chamber, and the air outlet structure is directly connected to the third chamber.

[0048] In some specific embodiments, the vent structure is located at the end of the third chamber away from the second chamber.

[0049] In some specific embodiments, the cross-sectional area of ​​the third chamber gradually decreases along the direction closer to the air outlet structure.

[0050] In some specific embodiments, the first and second chambers are cylindrical structures, the third chamber is a frustum-shaped structure, and the cone angle of the third chamber is less than 90°, preferably less than 45°. This allows the airflow to have a smoother transition from the larger diameter first and second chambers to the smaller diameter nozzle outlet, thereby reducing gas energy loss.

[0051] In some specific embodiments, the counter-current gas mixer further includes: an air inlet cover, which is disposed on the gas mixer body and sealed to the gas mixer body; the air inlet cover and the gas mixer body enclose an air inlet chamber; the air inlet chamber is connected to a gas supply device via an air guide port; and the air inlet chamber is also connected to the mixing chamber via the air inlet structure.

[0052] In some specific embodiments, the depth of the air intake chamber is greater than the length of the air hole but less than twice the length of the air hole along the axial direction of the air hole.

[0053] This invention also provides an engine, including the aforementioned counter-current gas mixer. Of course, the engine also includes other components, all of which are structures and components known to those skilled in the art, and are not specifically limited or described here.

[0054] The following will further explain and illustrate the technical solution, its implementation process and principle in conjunction with the accompanying drawings and specific implementation examples. It should be noted that the following embodiments are merely exemplary and are mainly used to explain and illustrate the structural composition of the present invention, rather than to limit the scope of protection of the present invention.

[0055] Example 1

[0056] Please see Figures 1-4A counter-current gas mixer includes a gas mixer body 110, which includes a shell and a mixing chamber 120 enclosed by the shell. The shell is provided with two air inlet structures 130 and one air outlet structure 140 communicating with the mixing chamber. The two air inlet structures 130 are located on different sides of the mixing chamber 120. Multiple gases to be mixed enter the mixing chamber 120 from the multiple air inlet structures 130 and collide with each other in the mixing chamber 120 to form a mixed gas. The mixed gas can be output to a downstream mechanism from the air outlet structure 140.

[0057] In this embodiment, please refer again. Figures 1-4 The gas mixer body 110 may include a main body portion 111 and a connecting portion 112. The main body portion 111 and the connecting portion 112 are detachably fixed and sealed together. The air inlet structure 130 is disposed on the main body portion 111, and the air outlet structure 140 is disposed on the connecting portion 112. The main body portion 111 and the connecting portion 112 are connected and enclosed within each other to form the mixing chamber 120. It should be noted that the structure and method of fixing and sealing the main body portion 111 and the connecting portion 112 can be implemented in ways known to those skilled in the art, and no specific limitation is made here.

[0058] In this embodiment, when the top of the main body 111 is open, a sealing top cover 113 can also be fixedly provided on the top of the main body 111. The sealing top cover 113 is fixed and sealed to the main body 111. The structure and method of fixing and sealing the main body 111 and the sealing top cover 113 can be implemented in ways known to those skilled in the art, and no specific limitation is made here.

[0059] In this embodiment, the connection between the air inlet cover and the main body should be firm and reliable, and should have good sealing conditions. At the same time, in actual use, a flashback arrestor should be connected in the upstream pipeline of the air inlet cover to ensure safety. It should be noted that the function of the sealing top cover 113 is only to seal the upper part of the mixing chamber, so that the airflow can only be output from the exhaust structure downward along the axial direction of the mixing chamber. Of course, according to the actual design and process, under certain conditions, the sealing top cover and the main body can be integrated.

[0060] In this embodiment, the air intake structure 130 includes a plurality of air holes 131. Each air hole 131 includes an air guide channel and an air inlet and an air outlet located at both ends of the air guide channel. The axial direction of the air outlet of at least a portion of the air holes 131 in one air intake structure 130 intersects or coincides with the axial direction of the air outlet of at least a portion of the air holes 131 in another air intake structure 130, so that the airflow entering the mixing chamber 120 from the two air intake structures 130 can collide head-on. At the same time, the gas to be mixed enters the mixing chamber 120 through the plurality of air holes 131. The plurality of air holes 131 can divert the incoming airflow, thereby improving the uniformity of the gas entering the mixing chamber 120 and increasing the speed of the gas entering the mixing chamber 120, thereby improving the mixing effect of the multiple airflows in the mixing chamber 120.

[0061] In this embodiment, the air inlet and outlet of each air hole 131 are coaxially arranged. Preferably, the air inlet, air guide channel and air outlet of each air hole 131 are coaxially arranged. Furthermore, the inner wall of the air guide channel is a continuous curved surface. That is, the surface of the air guide channel in the air hole 131 should not be set as a rectangle, triangle or other shape with sharp corners. Sharp corners in the air guide channel will cause the airflow to become turbulent and cannot form an effective counter-current in the mixing chamber. Therefore, the central angle corresponding to any area of ​​the inner wall of the air guide channel is greater than or equal to 90°, for example, it can be 120°.

[0062] In this embodiment, please refer to Figure 5a and Figure 5b The area of ​​the air inlet of the air hole 131 is greater than or equal to the area of ​​the air outlet. That is, the air hole 131 can be a straight hole or a conical hole. The air intake effect of the conical hole is better than that of the straight hole. The conical hole should be set with a large air inlet area and a small air outlet area. In this case, each conical hole forms a contracting nozzle, which can accelerate the subsonic incoming flow and help the two airflows entering from the two air intake structures 130 to mix in the mixing chamber. However, compared with the straight hole, the conical hole is more difficult to process, and the hole arrangement density of the conical hole will be lower than that of the straight hole. Of course, the air hole 131 can also be set with other structures.

[0063] In this embodiment, the structures of the plurality of air holes 131 included in the air intake structure 130 may be the same or different. For example, the plurality of air holes 131 included in the same air intake structure 130 may all be straight holes or all be tapered holes or partly straight holes and partly tapered holes. Preferably, the structures of the plurality of air holes 131 included in the air intake structure 130 are the same.

[0064] In this embodiment, the axial directions of the plurality of air holes 131 included in the same air intake structure 130 are arranged in parallel, and the angle between the axial direction of the air outlet of the air hole 131 and the axial direction of the mixing chamber 120 is 30-90°, preferably 90°; that is, the air hole 131 can be inclined or horizontal.

[0065] In this embodiment, please refer to Figure 9a , Figure 9b and Figure 9c The multiple air holes 131 included in the air intake structure 130 are arranged in an array. The number of air holes 131 included in each air intake structure 130 is not limited, and the arrangement is not limited to rectangular array, circular array, regular pentagonal array, etc. The specific arrangement can be arranged according to the working conditions and the structure of the air inlet and outlet of the air holes.

[0066] In this embodiment, the pore diameter is 0.3-1.5 mm, preferably 0.3-0.8 mm, and the length-to-diameter ratio of the pore is below 8 to prevent excessive gas loss along the pipe due to the excessively long rough pipe wall, which would reduce momentum too much and reduce the mixing effect.

[0067] In this embodiment, the two intake structures 130 may have the same or different structures, and it is preferable that the two intake structures 130 have the same structure.

[0068] In this embodiment, please refer to Figure 6a and Figure 6b In the axial direction of the mixing chamber 120, the partial air holes 131 of the two air intake structures 130 are at the same height, or the entire height of the two air intake structures 130 is at the same height in the axial direction of the mixing chamber 120, so that the gas input from the two air intake structures 130 can better collide.

[0069] In this embodiment, please refer to [link / reference]. Figure 6a and Figure 6b The two air intake structures 130 are arranged opposite each other, that is, the two air intake structures 130 are arranged at 180° in the circumferential direction with the axis of the mixing chamber as the axis (the center of the circumference is located on the axis of the mixing chamber, and the circumference is perpendicular to the axis). The orthographic projections of the two air intake structures 130 in the same plane completely overlap or partially overlap.

[0070] In this embodiment, the multiple air holes 131 included in the two air intake structures 130 can be one-to-one corresponding, or the multiple air holes 131 included in the two air intake structures 130 can be set to be staggered by a certain distance according to the actual use effect.

[0071] In this embodiment, the cross-sectional area of ​​the mixing chamber 120 near the air inlet structure 130 is larger than the cross-sectional area of ​​the part near the air outlet structure 140, and the inner wall of the mixing chamber 120 is a continuous curved surface. That is, the inner wall or surface of the mixing chamber 120 should not be set as a rectangle, triangle or other shape with sharp corners. Sharp corners in the air guide channel will cause the airflow to become turbulent. Therefore, the central angle corresponding to any area of ​​the inner wall of the mixing chamber 120 is greater than 120°.

[0072] In this embodiment, please refer to Figure 4 and Figure 10 The mixing chamber 120 includes a first chamber 121, a second chamber 122, and a third chamber 123 that are sequentially and smoothly connected along its own axis. Two air inlet structures 130 are disposed opposite to the two sides of the first chamber 121 and are directly connected to the first chamber 121. The air outlet structure 140 is located at the end of the third chamber 123 away from the second chamber 122 and is directly connected to the third chamber 123.

[0073] In this embodiment, the first chamber 121 serves as the core chamber and cooperates with the intake structure 130. The cross-sectional area of ​​the first chamber 121 is equal to that of the second chamber 122. The cross-sectional area of ​​the third chamber 123 gradually decreases along the direction close to the exhaust structure 140. Any two adjacent chambers of the first chamber 121, the second chamber 122, and the third chamber 123 are smoothly connected to avoid sharp corners. The cross-sectional area of ​​the third chamber 123 gradually decreases, and its end is set as a converging nozzle (which can be understood as part of the exhaust structure 140), so that the subsonic mixed airflow can be accelerated through. The exhaust structure 140 has a straight airflow channel, so that the mixed airflow enters the combustion chamber at the accelerated speed.

[0074] In this embodiment, the third chamber 123 should have a smooth transition and contraction, and the center angle corresponding to the transition connection between the third chamber 123 and the second chamber 122 and the air outlet structure 140 should be greater than 120°.

[0075] In this embodiment, the first chamber 121 and the second chamber 122 are cylindrical structures, and the third chamber 123 is a frustum or cone structure. Furthermore, the cone angle of the third chamber 123 is less than 90°. This allows the airflow to have a smoother transition from the larger diameter first chamber and the second chamber to the smaller diameter nozzle outlet, thereby reducing gas energy loss.

[0076] In this embodiment, the gas mixer body 110 is also provided with two air inlet covers 150. The air inlet covers 150 are sealed to the gas mixer body 110 (in this embodiment, the air inlet covers 150 are sealed to the main body portion 111 of the gas mixer body 110). The air inlet covers 150 completely cover the air intake structure 130. The air inlet covers 150 and the gas mixer body 110 enclose an air intake chamber 152. The air intake chamber 152 is connected to the gas supply device through the air guide port 151. The air intake chamber 152 is also connected to the mixing chamber 120 through the air intake structure 130.

[0077] In this embodiment, along the axial direction of the air hole 131, the depth of the air intake chamber 152 is greater than the length of the air hole 131 but less than twice the length of the air hole 131. It should be noted that if the depth of the air intake chamber 152 is too short, it will cause uneven air intake of the air intake structure, while if it is too long, it will cause the volume of the air intake chamber 152 to be too large, thereby affecting the air intake speed and pressure of the corresponding air intake structure.

[0078] In this embodiment, the components of the counter-current gas mixer can be fixedly connected by fasteners such as screws or bolts, and sealed with sealing components such as O-rings. There are no special requirements for the size of the mixing chamber, but an excessively large size will weaken the counter-current effect of the gas flow to be mixed. There are no requirements for the outer surface shape of the main body, but the inner surface morphology of the mixing chamber must meet the requirement that there are no sharp turns. Whether the inner surface structure is a rotating or non-rotating body, all corners should be treated with large rounded corners.

[0079] Please see Figure 11 An engine includes the aforementioned counter-current gas mixer 100 and combustion chamber 200. The counter-current gas mixer 100 is connected to the combustion chamber 200 via the aforementioned exhaust structure 140. It should be noted that only the counter-current gas mixer 100 and combustion chamber 200 of the engine are shown in this embodiment. The engine also includes other components, all of which are structures and components known to those skilled in the art, and are not specifically limited or described here.

[0080] In this embodiment, please refer to Figure 10The working principle of the counter-current gas mixer provided in this embodiment of the invention includes at least the following: connecting a first gas supply device for providing a first gas and a second gas supply device for providing a second gas to two air inlet chambers 152 disposed between two air inlet covers 150 and the main body 110 of the gas mixer; the first gas and the second gas enter the two air inlet chambers 152 respectively, and then are accelerated through multiple air holes 131 of the two air inlet structures 130 and uniformly enter the mixing chamber 120, where they collide and counter-currently, thereby premixing the first gas and the second gas.

[0081] The premixed gas mixture flows in the mixing chamber 120 in the direction toward the outlet structure 140. As the cross-sectional area of ​​the mixing chamber 120 gradually decreases in the direction toward the outlet structure 140, the gas mixture is gradually accelerated during the flow, and finally the gas mixture enters the combustion chamber 200 from the outlet structure 140 at the accelerated speed.

[0082] Example 2

[0083] Please see Figure 6a and Figure 6b The structure of the counter-current gas mixer in this embodiment is basically the same as that of the counter-current gas mixer in Embodiment 1. The difference is that the relative positions of the two air inlet structures 130 are different in this embodiment. The two air inlet structures 130 in this embodiment are arranged at an angle greater than 0° and less than 180° in the circumferential direction surrounding the mixing chamber 120, preferably at an angle greater than or equal to 90° and less than 180°. Figure 6a The two air intake structures 130 shown are positioned at 90°. Figure 6b The angle between the two air intake structures 130 shown is 120°.

[0084] Example 3

[0085] Please see Figure 8a The structure of the counter-current gas mixer in this embodiment is basically the same as that in Embodiment 1. The difference is that the counter-current gas mixer in this embodiment is provided with four air inlet structures 130. In a circumferential direction surrounding the mixing chamber 120, two adjacent air inlet structures 130 are arranged at 90°. The four air inlet structures 130 can achieve the mixing of two or more gases and / or atomized liquids. For example, the four air inlet structures 130 can mix four gases or three gases and one atomized liquid, or they can be paired up to mix two gases or one gas and one atomized liquid.

[0086] Please refer to Example 4 Figure 8bThe structure of the counter-current gas mixer in this embodiment is basically the same as that of the counter-current gas mixer in Embodiment 1. The difference is that the counter-current gas mixer in this embodiment is provided with three air inlet structures 130. In a circumferential direction surrounding the mixing chamber 120, two adjacent air inlet structures 130 are arranged at 120°. The three air inlet structures 130 can realize the mixing of two or more gases and / or atomized liquids.

[0087] It should be noted that, in this embodiment of the invention, the plurality of air intake structures 130 are spaced apart in a circumferential direction surrounding the mixing chamber 120. The plane containing this circumferential direction is perpendicular to the axial direction of the mixing chamber 120. This can also be understood as the plane containing the circumferential direction being the cross-section of the mixing chamber. The angle between the air intake structures in the circumferential direction surrounding the mixing chamber is the central angle between two air intake structures. In this embodiment of the invention, the cross-section refers to a cross-section formed along the radial direction. Furthermore, regarding the counter-current gas mixer in this embodiment of the invention, it can be used not only for premixing gases but also for premixing gases and atomized liquids, as well as between atomized liquids.

[0088] The counter-current gas mixer provided in this embodiment of the invention can be directly connected to the combustion chamber of a premixed rotary detonation engine, reducing the distance at which backfire occurs, which is more in line with the modular and integrated design concept and reduces the design difficulty of the combustion chamber. Furthermore, the main mixing structure of the counter-current gas mixer provided in this embodiment of the invention adopts an array of small holes with a counter-current structure, which can greatly increase the uniformity of gas mixing. After the two gas streams are counter-currently mixed, the subsequent channel is designed as a converging nozzle, which can accelerate the subsonic airflow.

[0089] This invention provides a counter-current gas mixer, wherein the array of small holes has various structural designs. The shape of a single hole can be a straight hole or a conical hole, and the arrangement of the hole array can be designed in various ways according to actual use requirements and effects, such as multiple rings and polygons. In this invention, the small hole array can be arranged at 180° opposite sides. In this case, the opposite holes can be arranged one-to-one or staggered, or they can be arranged alternately between 90° and 180°. This invention is not limited to two gas inlets. When the structure and actual effect are satisfied, it can be designed as multiple sets of hole arrays distributed along the circumference as a multi-inlet structure.

[0090] It should be understood that the above embodiments are merely illustrative of the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A counter-current gas mixer, comprising a gas mixer body, the gas mixer body including a shell and a mixing chamber enclosed by the shell, the shell being provided with an outlet structure communicating with the mixing chamber and a plurality of inlet structures; characterized in that: Multiple air intake structures are distributed around the mixing chamber. Each air intake structure includes multiple air holes. Each air hole includes an air guide channel and an air inlet and an air outlet located at both ends of the air guide channel. The axial directions of the air outlets of at least a selected plurality of air holes intersect or coincide with each other. The selected plurality of air holes belong to different air intake structures. The angle between the axial direction of the air outlet of the air hole and the axial direction of the mixing chamber is 30-90°. The length-to-diameter ratio of the air holes is less than 8. The mixing chamber includes a first chamber, a second chamber, and a third chamber that are sequentially and smoothly connected along its own axis. A plurality of air inlet structures are arranged around the first chamber and directly connected to the first chamber. The air outlet structure is directly connected to the third chamber. The cross-sectional area of ​​the third chamber gradually decreases along the direction close to the air outlet structure. The cone angle of the third chamber is less than 90°. The cross-sectional area of ​​the part of the mixing chamber close to the air inlet structure is larger than the cross-sectional area of ​​the part close to the air outlet structure.

2. The counter-current gas mixer according to claim 1, characterized in that: The air inlet and outlet of each of the aforementioned air holes are arranged coaxially.

3. The counter-current gas mixer according to claim 2, characterized in that: The air inlet, air guide channel and air outlet of each of the aforementioned air holes are arranged coaxially.

4. The counter-current gas mixer according to claim 1, characterized in that: The area of ​​the air inlet is greater than or equal to the area of ​​the air outlet.

5. The counter-current gas mixer according to claim 1, characterized in that: The inner wall of the air guide channel is a continuous curved surface.

6. The counter-current gas mixer according to claim 1, characterized in that: The central angle corresponding to any region of the inner wall of the air guide channel is greater than or equal to 90°.

7. The counter-current gas mixer according to claim 1 or 2, characterized in that: The intake structure contains multiple air holes arranged in parallel along their axial directions.

8. The counter-current gas mixer according to claim 7, characterized in that: The structures of the multiple air holes in each of the aforementioned air intake structures are identical.

9. The counter-current gas mixer according to claim 8, characterized in that: The structures of the multiple air vents in the multiple air intake structures are all identical.

10. The counter-current gas mixer according to claim 7, characterized in that: Each of the aforementioned air intake structures contains a plurality of air holes arranged in an array.

11. The counter-current gas mixer according to claim 7, characterized in that: The pore diameter is 0.3-1.5 mm.

12. The counter-current gas mixer according to claim 11, characterized in that: The pore diameter is 0.3-0.8 mm.

13. The counter-current gas mixer according to claim 7, characterized in that: Along the axial direction of the mixing chamber, some of the air holes of the multiple air inlet structures are at the same height.

14. The counter-current gas mixer according to claim 13, characterized in that: Along the axial direction of the mixing chamber, the multiple air intake structures are at the same height.

15. The counter-current gas mixer according to claim 13, characterized in that: In the circumferential direction surrounding the mixing chamber, the angle between any two air intake structures is greater than 0° and less than or equal to 180°.

16. The counter-current gas mixer according to claim 15, characterized in that: In the circumferential direction surrounding the mixing chamber, the angle between any two air intake structures is greater than 90° and less than or equal to 180°.

17. The counter-current gas mixer according to claim 15, characterized in that: The multiple air intake structures are arranged at equal angles in the circumferential direction surrounding the mixing chamber.

18. The counter-current gas mixer according to claim 15, characterized in that: The multiple intake structures described herein have the same structure.

19. The counter-current gas mixer according to claim 15, characterized in that: The multiple air holes of any two of the aforementioned air intake structures correspond one-to-one.

20. The counter-current gas mixer according to claim 1, characterized in that: The inner wall of the mixing chamber is a continuous curved surface.

21. The counter-current gas mixer according to claim 20, characterized in that: The central angle corresponding to any region of the inner wall of the mixing chamber is greater than or equal to 90°.

22. The counter-current gas mixer according to claim 1, characterized in that: The vent structure is located at the end of the third chamber away from the second chamber.

23. The counter-current gas mixer according to claim 1 or 22, characterized in that: The first and second chambers are cylindrical structures, and the third chamber is a frustum-shaped structure.

24. The counter-current gas mixer according to claim 1, characterized in that, Also includes: air intake The inlet cover is disposed on the gas mixer body and is sealed to the gas mixer body. The inlet cover and the gas mixer body enclose an inlet chamber. The inlet chamber is connected to the gas supply equipment through the gas guide port. The inlet chamber is also connected to the mixing chamber through the inlet structure.

25. The counter-current gas mixer according to claim 24, characterized in that: Along the axial direction of the vent, the depth of the air inlet chamber is greater than the length of the vent but less than twice the length of the vent.

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