An evaporation device built into a double channel of a combustion chamber

Abstract

The application discloses an evaporation device built in two-channel combustion chamber, comprising: sequentially arranged oil collecting ring part, mixing ring cavity part and a plurality of evaporation pipe middle part, the inside of the oil collecting ring part is provided with a cavity, the inner wall of the mixing ring cavity part and the plurality of evaporation pipe middle part and the outer wall of the flame tube outer ring jointly form an evaporation cavity; the oil collecting ring part is provided with an oil inlet hole and an oil injection hole, the mixing ring cavity part is provided with an air inlet hole, and the sidewall of the flame tube outer ring is provided with a plurality of communication holes corresponding to the evaporation cavity and the evaporation end pipe. The application reduces the number of direct injection nozzles under the condition of ensuring that the fuel and air are fully mixed and evaporated; the flow passage section of the evaporation sleeve and the evaporation end pipe is designed to be tapered, so that the pressure of the oil gas mixture is reduced and the speed is increased during the flow process; the fuel is pre-buffered by the oil collecting ring part, the fuel is pressurized through the oil injection hole, and the subsequent breaking effect of the fuel is improved.

Description

Technical Field

[0001] This invention belongs to the field of aero-engine combustion chamber technology, and specifically relates to an evaporation device built into a two-channel combustion chamber. Background Technology

[0002] The types of fuel nozzles in the combustion chamber of an aircraft engine generally include direct injection, centrifugal, and pneumatic types. From a cost perspective, the design and manufacturing costs of centrifugal nozzles and pneumatic atomizing nozzles are much higher than those of direct injection nozzles. Therefore, direct injection nozzles are an effective way to reduce the cost of the combustion chamber.

[0003] However, the current direct-injection nozzles have the disadvantage of poor atomization effect, so they are generally used in conjunction with an evaporation device. At the same time, in order to make the flame tube have good flame connection performance and outlet temperature field distribution, the evaporation device needs to be densely arranged in the circumference, which requires a large number of direct-injection nozzles and increases the overall cost. If an evaporation device with one inlet and multiple outlets is used, although the number of direct-injection nozzles can be reduced, it is difficult to ensure that the oil-gas mixture at each outlet of the evaporation device is uniform, resulting in uneven distribution of the oil-gas mixture in various parts of the combustion chamber. During combustion, local overheating will occur inside the flame tube and hot spots will appear at the combustion chamber outlet. Summary of the Invention

[0004] To address the above problems, this invention proposes an evaporation device built into a two-channel combustion chamber, comprising: an evaporation kit, a flame tube outer ring sleeved with the inner wall of the evaporation kit, a fuel main pipe, and an evaporation end pipe; The evaporation kit includes: an oil collecting ring, a mixing ring cavity, and several evaporation tube sections arranged sequentially and adjacently. An annular chamber is opened inside the oil collecting ring. The inner walls of the mixing ring cavity and the several evaporation tube sections together form an evaporation chamber with the outer wall of the outer ring of the flame tube. The oil collecting ring is provided with an oil inlet hole that communicates with the fuel main pipe and several oil injection holes that communicate with the evaporation chamber. The mixing ring cavity is provided with an air inlet hole that communicates with the evaporation chamber. Several evaporation end pipes are installed on the inner wall of the outer ring of the flame tube, and several connecting holes are correspondingly opened on the side wall of the outer ring of the flame tube to connect the evaporation chamber and the evaporation end pipes.

[0005] Furthermore, a number of injection holes are arranged in a circumferential array on the oil collecting ring. Each injection hole includes at least two holes arranged side by side, and the injection holes are located in the middle of the middle sections of two adjacent evaporator tubes. The inner cavity cross section of the mixing ring cavity adopts a trapezoidal structure.

[0006] Furthermore, the connection between the middle section of the evaporator tube and the side wall of the mixing ring cavity is made with a rounded transition.

[0007] Furthermore, the evaporation chamber of the evaporation kit has a gradually tapering structure, and the connecting hole is located at the rear end of the middle section of the evaporation tube.

[0008] Furthermore, the air intake cavity adopts a compound angle, with an axial deflection angle of 50°~70° and a circumferential deflection angle of 10°~30°.

[0009] Furthermore, all the injection holes maintain the same orientation, and the inner cavity of the injection hole adopts a compound angle, with an axial deflection angle of 20°~30° and a circumferential deflection angle of 20°~35°.

[0010] Furthermore, the cross-section of the evaporator tube adopts a gradually shrinking structure, and the evaporator tube adopts a compound angle, with the axial deflection angle and circumferential deflection angle of the outlet section of the evaporator tube being 45°~70°.

[0011] Furthermore, the diameter of the inlet end of the evaporator tube is the same as the diameter of the connecting hole.

[0012] Furthermore, a natural transition surface is formed between the outer wall of the oil collecting ring and the outer wall of the flame tube.

[0013] Furthermore, the evaporation kit has overlapping skirts at both the front and rear ends.

[0014] Furthermore, the fuel main pipe includes a ring pipe and fuel outlet branches. One end of the ring pipe is connected to an external fuel pump pipe through a hose. Several fuel outlet branches are provided at intervals on the outer wall of the ring pipe. The oil collecting ring is provided with several oil inlet holes that correspond one-to-one with the fuel outlet branches, and the several fuel outlet branches are arranged in a circumferential array around the outer ring.

[0015] This application proposes an evaporation device integrated into a dual-channel combustion chamber. While ensuring thorough mixing and evaporation of fuel and air, it integrates over a dozen direct-injection nozzles and the evaporation mixing channel into a single component, reducing the number of direct-injection nozzles and lowering costs. Furthermore, the evaporation kit has a compact structure and fits snugly against the outer ring of the flame tube. Without affecting the airflow in the dual-channel system, the outer ring of the flame tube serves as the boundary between the evaporation device and the combustion flow field. The heat generated during combustion can be used to heat the fuel within the evaporation kit, increasing the evaporation rate. The fuel, after absorbing heat, can then cool the outer ring of the flame tube, reducing the flame tube wall temperature and extending the flame tube's service life. The design of the middle section of the evaporator tube matching the fuel injection hole allows air to flow into the evaporator chamber from the air inlet with a compound angle. The air rotates circumferentially and flows axially in the evaporator chamber, which helps to break large oil droplets into smaller droplets. At the same time, it ensures that the amount of oil and air in the middle section of each evaporator tube is uniform, and further mixing and evaporation are achieved through the middle section of the evaporator tube and the evaporator end tube. The flow channel cross-section of the evaporator kit and the evaporator end tube is gradually narrowed to ensure that the pressure and speed of the oil-air mixture are always reduced during the flow process, preventing backflow and backfire. The fuel is pre-buffered by the fuel collecting ring and pressurized by the fuel injection hole to improve the subsequent fuel breaking effect.

[0016] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description and the drawings. Attached Figure Description

[0017] 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 some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of an evaporation device built into a two-channel combustion chamber is shown in an embodiment of the present invention; Figure 2 A schematic diagram of the evaporation kit in an embodiment of the present invention is shown; Figure 3 This shows a cross-sectional schematic diagram of an evaporator device integrated into a combustion chamber with two channels in an embodiment of the present invention; Figure 4 A schematic cross-sectional view of the evaporation kit in an embodiment of the present invention is shown. Figure 1 ; Figure 5 A schematic cross-sectional view of the evaporation kit in an embodiment of the present invention is shown. Figure 2 ; Figure 6 A schematic diagram of the fuel main pipe in an embodiment of the present invention is shown; Figure 7 A partial schematic diagram of the evaporator end tube in an embodiment of the present invention is shown.

[0019] In the figure, there are evaporator kit 1, oil collecting ring 11, mixing ring cavity 12, middle section of evaporator tube 13, oil inlet 14, oil injection hole 15, outer ring of flame tube 2, connecting hole 21, fuel main pipe 3, and evaporator end pipe 4. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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 some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] This invention provides an evaporation device integrated into a combustion chamber with two channels. Figure 1 A schematic diagram of an evaporation device built into a two-channel combustion chamber according to an embodiment of the present invention is shown. Figure 1 The evaporation device built into the two channels of the combustion chamber includes: evaporation kit 1, flame tube outer ring 2 sleeved with the inner wall of evaporation kit 1, fuel main pipe 3, and evaporation end pipe 4.

[0022] The evaporation kit 1 includes: an oil collecting ring 11, a mixing ring cavity 12, and several evaporation tube middle sections 13 arranged sequentially and adjacently. The oil collecting ring 11 has an annular chamber inside. The inner walls of the mixing ring cavity 12 and the several evaporation tube middle sections 13 together form an evaporation chamber with the outer wall of the outer ring 2 of the flame tube.

[0023] The oil collecting ring 11 is provided with an oil inlet 14 that communicates with the fuel main pipe 3 and several oil injection holes 15 that communicate with the evaporation chamber. The mixing ring cavity 12 is provided with an air inlet 16 that communicates with the evaporation chamber. Several evaporation end pipes 4 are installed on the inner wall of the outer ring 2 of the flame tube, and several connecting holes 21 are correspondingly opened on the side wall of the outer ring 2 of the flame tube to connect the evaporation chamber and the evaporation end pipes 4.

[0024] In actual use, fuel is supplied to the evaporation kit 1 through the fuel main pipe 3. Under the high pressure of the external fuel pipe, the fuel is split into smaller liquids in the evaporation chamber. The outer ring 2 of the flame tube not only serves as the boundary of the combustion flow field but also acts as the inner wall of the evaporation kit 1, continuously transferring the high temperature inside the flame tube to the evaporation chamber, promoting fuel evaporation. Under the action of the mixing ring cavity 12 and several middle sections 13 of the evaporation tubes, the air and fuel are mixed. Finally, the air and fuel are further evaporated and mixed through the evaporation end pipe 4 at a higher temperature, resulting in smaller droplet sizes and more uniform mixing of the sprayed fuel-air mixture.

[0025] Specifically, a plurality of injection holes 15 are arranged in a circumferential array on the oil collecting ring 11. Each injection hole 15 includes at least two orifices arranged side by side, and the injection holes 15 are located in the middle position of two adjacent evaporator tube middle sections 13. Correspondingly, the inner cavity cross-section of the mixing ring cavity 12 adopts a trapezoidal structure. After the fuel is injected into the mixing ring cavity 12, it quickly collides with the wall of the mixing ring cavity 12, which helps to promote the breakup of large-sized fuel droplets into small droplets. The high-temperature energy generated by the combustion of fuel in the combustion chamber is transferred to the mixing ring cavity 12 through heat conduction, radiation and other media, heating the fuel in the evaporation chamber and accelerating the evaporation of fuel. (Reference) Figure 2 In the example shown, each orifice has a diameter of 0.2mm to 0.3mm. These 36 orifices enable multi-point uniform injection, achieving a comprehensive and uniform fuel supply to the flame tube.

[0026] refer to Figure 5Several evaporator tube mid-sections 13 are arranged in a circumferential array about the axis of the outer ring 2 of the flame tube on one side of the mixing ring cavity 12. The axial length of the evaporator tube mid-sections 13 is about 40 mm to ensure that the fuel has sufficient evaporation distance, and the connection between the evaporator tube mid-sections 13 and the side wall of the mixing ring cavity 12 is rounded. When the oil-gas mixture flows from the mixing ring cavity 12 into the inner cavity of the evaporator tube mid-sections 13, a certain impact force will be generated at the connection between the two. Through the rounded transition, the magnitude of the stress concentration at the connection point is reduced; secondly, the flow loss at the connection point is reduced, and the flow separation caused by excessive turning angle when the oil-gas mixture flows from the inner cavity of the mixing ring cavity 12 into the inner cavity of the evaporator tube mid-sections 13 is avoided.

[0027] refer to Figure 4 The evaporation chamber of the evaporator kit 1 has a gradually contracting structure. Specifically, the height of the evaporation chamber in the mixing ring cavity 12 is higher than the height of the evaporation chamber in the middle section of the evaporator tube 13, and the height of the evaporation chamber in the middle section of the evaporator tube 13 gradually decreases as the distance from the mixing ring cavity 12 increases. This gradually contracting structure allows for continuous pressure reduction and acceleration of the fuel and air flow within the evaporation chamber, preventing backflow of fuel and air. The connecting hole 21 is located at the rear end of the middle section of the evaporator tube 13, meaning it is at the lowest point of the evaporation chamber. This ensures that the fuel-air mixture within the evaporator kit 1 always flows from high to low, preventing accumulation within the evaporator kit 1.

[0028] Specifically, in combination Figure 4 and Figure 5 In actual engine operation, the air flowing out from the compressor's axial diffuser will have a certain deflection angle, rather than being parallel to the engine's central axis. To fully utilize the residual swirl of the compressor's outlet airflow, the inner cavity of the intake port 16 adopts a compound angle, with an axial deflection angle of 50°~70° and a circumferential deflection angle of 10°~30°, improving the smoothness of the incoming airflow from the compressor outlet flowing into the mixing annular cavity 12 through the intake port 16. Multiple intake ports 16, with diameters of 1.7mm~2.4mm, are evenly arranged circumferentially along the axis on the outer surface of the mixing annular cavity 12. The small size and dense arrangement of the intake ports 16, while ensuring a certain penetration depth, enhance the mixing of air and fuel, and make the intake or gas flow process of the mixing annular cavity 12 more uniform, improving the stability of the entire mixing and evaporation process.

[0029] Meanwhile, in order to ensure that the fuel injected from the injection hole 15 can flow smoothly into the evaporation cavity of the nearest evaporator pipe middle section 13, all the injection holes 15 are aligned in the same direction, and the inner cavity of the injection hole 15 adopts a compound angle, with an axial deflection angle of 20°~30° and a circumferential deflection angle of 20°~35°, so that the fuel injected from the injection hole 15 can flow in the same direction in the mixing ring cavity 12 and finally flow into the evaporation cavity of the nearest evaporator pipe middle section 13.

[0030] Based on the above-mentioned fuel injection port 15 and air intake port 16, the deflection angles of the two need to be set to be different, so that the initial inflow direction of air is not parallel to the initial inflow direction of fuel, thereby strengthening the shearing effect between air and fuel and improving the efficiency of fuel atomization.

[0031] refer to Figure 3 The cross-section of the evaporator pipe 4 adopts a gradually shrinking structure. That is, from the inlet end to the outlet end of the evaporator pipe 4, the cross-section of the inner cavity of the evaporator pipe 4 gradually decreases. This ensures that the oil-gas mixture flowing in from the inlet end of the evaporator pipe 4 can continue to maintain pressure reduction and speed increase after entering the evaporator pipe 4, thus avoiding the problem of backflow of the premixed oil-gas mixture leading to ignition.

[0032] Meanwhile, since the evaporator end pipe 4 is designed within the combustion flow field and has a high contact temperature, when the oil-gas mixture flows from the middle section 13 of the evaporator pipe into the evaporator end pipe 4, it will undergo a second evaporation and mixing, which further reduces the droplet size of the sprayed oil-gas mixture and makes the mixing of the two more uniform.

[0033] Correspondingly, refer to Figure 7 The evaporator end pipe 4 adopts a compound angle. The axial deflection angle and circumferential deflection angle of the outlet section of the evaporator end pipe 4 are 45°~70°. This ensures that after the oil-gas mixture is sprayed out from the evaporator end pipe 4, it rotates in the main combustion zone of the flame tube to form a large annular vortex, generating a low-speed recirculation zone, further stabilizing the flame, and further ensuring the stable state required for combustion operation.

[0034] Correspondingly, the evaporator end pipe 4 is assembled at the position of the connecting hole 21 on the outer ring 2 of the flame tube, wherein the diameter of the inlet end of the evaporator end pipe 4 is consistent with the diameter of the connecting hole 21, so as to avoid the oil-gas mixture flowing into the evaporator end pipe 4 from the connecting hole 21, which would cause changes in the flow of the oil-gas mixture due to the inconsistent cross-sectional shape, and improve the smoothness of the oil-gas mixture entering the evaporator end pipe 4.

[0035] In order to avoid the device of this application affecting the airflow in the two channels, the evaporation kit 1 adopts a thin-walled cavity structure, and the height of the highest oil collecting ring 11 in the evaporation kit 1 is limited, with the maximum height controlled within 5mm.

[0036] At the same time, Figure 3In the example shown, in order to further reduce the impact on the airflow in the two channels, the cross-section of the oil collecting ring 11 adopts a parallelogram structure, and the side wall of the oil collecting ring 11 facing the direction of airflow adopts a convex slope structure at the lower end. The side wall between the outer ring side wall of the oil collecting ring 11 and the outer ring side wall of the outer ring 2 of the flame tube forms a natural transition surface. The incoming airflow from the combustion chamber inlet can gradually change its flow trajectory along the outer wall of the oil collecting ring 11, rather than directly impacting the surface of the oil collecting ring 11 and causing flow separation, thereby reducing the loss of airflow pressure.

[0037] The evaporation kit 1 has overlapping skirts at both ends, with an overlap length of 4mm to 5mm. When the evaporation kit 1 is installed on the outer ring 2 of the flame tube, the two can be welded together along the overlapping skirts to avoid large deformation of the evaporation cavity structure of the evaporation kit 1 under welding heat, and to further reduce the loss of airflow pressure.

[0038] refer to Figure 6 In the example shown, the fuel main pipe 3 includes a ring pipe 31 and fuel outlet branch pipes 32. The ring pipe 31 and the fuel outlet branch pipes 32 can be directly welded together. The ring pipe 31 is formed by bending a pipe. One end of the ring pipe 31 is connected to an external fuel pump pipe through a flexible hose. The outer wall of the ring pipe 31 is provided with a plurality of fuel outlet branch pipes 32 at intervals. The oil collecting ring 11 is provided with a plurality of oil inlet holes 14 that correspond one-to-one with the fuel outlet branch pipes 32, and the plurality of fuel outlet branch pipes 32 are arranged in a circumferential array around the oil collecting ring 11. In this embodiment, three fuel outlet branch pipes 32 are connected to the oil collecting ring 11, and the included angle between adjacent circumferences of each fuel outlet branch pipe 32 is 120°, so that the fuel delivered by the external fuel pump pipe can be evenly supplied into the inner cavity of the oil collecting ring 11 and then enter the evaporation kit 1.

[0039] In the actual production and processing of the device of this application, the evaporation kit 1 can be 3D printed and then welded together with the outer ring 2 of the flame tube to form a closed evaporation channel, or the outer ring 2 of the flame tube and the evaporation kit 1 can be directly processed as a whole by 3D printing, saving the cumbersome welding process.

[0040] In summary, the working principle of the evaporator device built into the two channels of the combustion chamber proposed in this invention is as follows: Fuel from the fuel tank flows in from the inlet end of the ring pipe 31, and flows into the inner cavity of the oil collecting ring 11 through the connected oil outlet branch pipe 32 and oil inlet hole 14. Since the fuel pressure delivered by the external fuel pump pipe is relatively high, generally above 1MPa, and the inner cavity of the oil collecting ring 11 is relatively small, the fuel will quickly fill the inner cavity of the oil collecting ring 11. At the same time, the fuel is injected at multiple points through 18 sets of 36 injection holes 15. Since the diameter of the injection holes 15 is small, the fuel can be initially atomized here and enter the evaporation chamber at the mixing ring cavity 12. Since the position of each set of injection holes 15 is arranged near the middle angle position of the middle section of the two evaporation pipes 13, after the fuel is injected into the evaporation chamber at the mixing ring cavity 12, it quickly collides with the wall of the mixing ring cavity 12, causing large oil droplets to be further broken into small oil droplets.

[0041] Meanwhile, since the outer side of the outer ring 2 of the flame tube is the evaporator kit 1, and the inner side of the outer ring 2 of the flame tube is the combustion flow field, the high temperature generated by fuel combustion in the combustion flow field can be transferred to the evaporation chamber of the evaporator kit 1 through heat conduction and radiation, directly increasing the fuel temperature in the evaporation chamber, enhancing the evaporation effect, and making the fuel atomization more uniform. At the same time, the heat absorption of the fuel can also reduce the wall temperature of the outer ring 2 of the flame tube. Simultaneously, the incoming air from the two channels enters the mixing ring cavity 12 through the air inlet 16 and undergoes shearing action with the fuel, further promoting fuel atomization and premixing with the fuel. Since both the fuel injection hole 15 and the air inlet 16 have a compound deflection angle, the residual swirl of the compressor outlet airflow can be fully utilized, making the intake process smoother. Simultaneously, the airflow can drive the fuel to rotate in one direction. Figure 4 and Figure 5 The airflow drives the fuel to rotate clockwise; during the flow, it also promotes further mixing of fuel and air. When the fuel and air flow to the connection between the mixing annular cavity 12 and the middle section of the evaporator tube 13, they enter the middle section of the evaporator tube 13. Therefore, the fuel injected from the 18 sets of injection holes 15, after initial evaporation, will all enter the nearest middle section of the evaporator tube 13 to continue absorbing the heat generated by the combustion of fuel in the combustion flow field and continue to shear with the incoming airflow, carrying out continuous evaporation and mixing operations. This ensures that the amount of fuel and air in the middle section of the evaporator tube 13 is not much different, so that the fuel-air mixture maintains a stable and balanced proportion, ensuring the uniformity of the circumferential distribution of the fuel-air mixture at the outlet of the evaporator kit 1.

[0042] Correspondingly, the fuel-air mixture in the evaporator assembly 1 flows into the evaporator end pipe 4 through the connecting hole 21. Since the evaporator end pipe 4 also has a compound deflection angle, the fuel continues to evaporate at the evaporator end pipe 4 and is injected into the flame tube. It will continue to rotate circumferentially, thereby forming a large annular vortex in the main combustion zone of the flame tube. This is conducive to the formation of the backflow zone and reduces the difficulty of successful ignition. In addition, the flow channel cross-sections of the middle section 13 of the evaporator pipe and the evaporator end pipe 4 are gradually narrowing. The fuel-air mixture is constantly depressurized and accelerated during the flow process, effectively avoiding backflow and ignition.

[0043] This application integrates more than a dozen direct-injection nozzles and evaporation mixing channels into one component while ensuring sufficient mixing and evaporation of fuel and air. This reduces the number of direct-injection nozzles and lowers costs. Furthermore, the evaporation kit 1 has a compact structure and fits tightly against the outer ring 2 of the flame tube. Without affecting the airflow of the two channels, the outer ring 2 of the flame tube serves as the boundary of the evaporation device and the combustion flow field. The heat from the combustion process can be used to heat the fuel in the evaporation kit 1, increasing the evaporation rate. After absorbing heat, the fuel can cool the outer ring 2 of the flame tube, reducing the flame tube wall temperature and increasing the flame tube's service life. The middle section 13 of the evaporation tube is matched with the injection hole 15. Air flows into the evaporation chamber from the air inlet 14 with a compound angle. The air rotates circumferentially and flows axially in the evaporation chamber, which helps to break large oil droplets into small droplets. At the same time, it ensures that the amount of fuel and air in the middle section 13 of each evaporation tube is uniform, and further mixing and evaporation are achieved through the middle section 13 of the evaporation tube and the evaporation end tube 4. The flow channel cross-section of the evaporation kit 1 and the evaporation end tube 4 is designed to gradually decrease pressure and increase speed during the flow of the fuel-air mixture, preventing backflow and flashback.

[0044] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An evaporation device built into a two-channel combustion chamber, used between the combustion chamber casing and the flame tube, characterized in that, include: Evaporation kit (1), flame tube outer ring (2) sleeved with the inner wall of evaporation kit (1), fuel main pipe (3), evaporation end pipe (4); The evaporation kit (1) includes: an oil collecting ring (11), a mixing ring cavity (12) and several evaporation tube middle sections (13) arranged sequentially and adjacently. The oil collecting ring (11) has an annular chamber inside. The inner walls of the mixing ring cavity (12) and several evaporation tube middle sections (13) together form an evaporation chamber with the outer wall of the outer ring (2) of the flame tube. The oil collecting ring (11) is provided with an oil inlet (14) that communicates with the fuel main pipe (3) and several oil injection holes (15) that communicate with the evaporation chamber. The mixing ring cavity (12) is provided with an air inlet (16) that communicates with the evaporation chamber. Several evaporation end pipes (4) are installed on the inner wall of the outer ring (2) of the flame tube, and several connecting holes (21) are correspondingly opened on the side wall of the outer ring (2) of the flame tube for connecting the evaporation chamber and the evaporation end pipes (4). A plurality of the aforementioned oil injection holes (15) are arranged in a circumferential array on the oil collection ring (11). Each oil injection hole (15) includes at least two holes arranged side by side, and the oil injection holes (15) are arranged in the middle position of two adjacent evaporator tube middle sections (13). The inner cavity cross section of the mixing ring cavity (12) adopts a trapezoidal structure. The air inlet (16) has a compound angle, with an axial deflection angle of 50°~70° and a circumferential deflection angle of 10°~30°.

2. The evaporator device built into the two channels of the combustion chamber according to claim 1, characterized in that, The connection between the middle section (13) of the evaporator tube and the side wall of the mixing ring cavity (12) is made by a rounded transition.

3. The evaporator device built into the two channels of the combustion chamber according to claim 1, characterized in that, The evaporation chamber of the evaporation kit (1) has a gradually shrinking structure, and the connecting hole (21) is located at the rear end of the middle section (13) of the evaporation tube.

4. The evaporator device built into the two channels of the combustion chamber according to claim 1, characterized in that, All of the aforementioned oil injection holes (15) maintain the same orientation, and the inner cavity of the oil injection hole (15) adopts a compound angle, with an axial deflection angle of 20°~30° and a circumferential deflection angle of 20°~35°.

5. The evaporator device built into the two channels of the combustion chamber according to claim 1, characterized in that, The cross section of the evaporation end tube (4) adopts a gradually shrinking structure, and the evaporation end tube (4) adopts a compound angle. The axial deflection angle and circumferential deflection angle of the outlet section of the evaporation end tube (4) are 45°~70°.

6. The evaporator device built into the two channels of the combustion chamber according to claim 5, characterized in that, The diameter of the inlet end of the evaporation tube (4) is the same as the diameter of the connecting hole (21).

7. The evaporator device built into the two channels of the combustion chamber according to claim 1, characterized in that, The outer wall of the oil collecting ring (11) and the outer wall of the flame tube outer ring (2) form a natural transition surface.

8. The evaporator device built into the two channels of the combustion chamber according to claim 7, characterized in that, The evaporation kit (1) has overlapping skirts at both the front and rear ends.

9. The evaporator device built into the two channels of the combustion chamber according to claim 1, characterized in that, The fuel main pipe (3) includes a ring pipe (31) and an outlet branch pipe (32). One end of the ring pipe (31) is connected to an external fuel pump pipe through a hose. The outer wall of the ring pipe (31) is provided with a number of outlet branch pipes (32) at intervals. The oil collecting ring (11) is provided with a number of oil inlet holes (14) that correspond one-to-one with the outlet branch pipes (32), and the number of outlet branch pipes (32) are arranged in a circular array around the oil collecting ring (11).

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