Ammonia-hydrogen dual-fuel rotational flow jet flow device return pipe joint

Abstract

The invention relates to the technical field of ammonia-hydrogen dual-fuel rotational flow jet flow devices, in particular to an ammonia-hydrogen dual-fuel rotational flow jet flow device backflow pipe connector which comprises a first pipe body, second pipe bodies connected to the two sides of the first pipe body and a third pipe body connected to the bottom end of the first pipe body. The second pipe body is sleeved with the installation pipe part, the end, close to the first pipe body, of the installation pipe part has a first outer diameter, the other end of the installation pipe part has a second outer diameter, and the first outer diameter is larger than the second outer diameter; the expanding and supporting mechanism is connected to the end, away from the first pipe body, of the second pipe body; the expanding and supporting mechanism comprises a plurality of supporting plates, and the supporting plates are rotationally connected to the tail end of the second pipe body through torsional elastic pieces. The rubber return pipe is provided with the opening mechanism, the opening mechanism can form a buffer area at the opening end of the second pipe body through diameter expansion, then the occurrence of partial cavitation on the oil inlet side of the return pipe connector is reduced, meanwhile, a space is provided for cavitation collapse on the oil outlet side through the buffer area, and the situation that the inner wall of the rubber return pipe is damaged by cavitation collapse is avoided.

Description

Technical Field

[0001] This invention relates to the field of reflux pipe fitting technology, specifically to the reflux pipe fitting of an ammonia-hydrogen dual-fuel cyclone jet. Background Technology

[0002] As a core component of the fuel supply system, the reliability of the return pipe joint of the ammonia-hydrogen dual-fuel swirl injector directly affects the combustion stability, operational safety, and service life of the injector. The core function of the reflux pipe connector is to reliably connect the reflux pipeline, guiding the incompletely injected reflux fuel from the ammonia-hydrogen dual-fuel cyclone injector back to the fuel tank after the work is completed. At the same time, it ensures that no leakage occurs at the connection under the system operating pressure. In actual use, the reflux pipe connector often forms a throttling structure because its internal diameter is often smaller than the inner diameter of the reflux pipe. For liquid ammonia, when the pressure drops below the saturated vapor pressure of liquid ammonia, the liquid ammonia will flash vaporize, producing a large number of ammonia bubbles. For hydrogen in the gas-liquid mixture, the sudden pressure drop will reduce the solubility of hydrogen in the liquid phase, precipitating more tiny hydrogen bubbles. When these bubbles enter the downstream pressure recovery area with the fluid, they will collapse instantly, forming local shock waves and high-speed micro-jet streams, which violently impact the inner wall of the reflux pipe and the sealing surface of the connector, destroying the tightness of the sealing surface. Since hydrogen molecules are small and highly permeable, and ammonia is corrosive, once the sealing surface is damaged, fuel leakage is very likely to occur, causing the risk of combustion, explosion, and poisoning.

[0003] In existing ammonia-hydrogen dual-fuel cyclone jets, the return pipe and return pipe connector mostly use a plug-in fit. The return pipe opening is expanded by gradually widening the connection end to achieve an interference fit. Under this structure, the pipe diameter between the return pipe and the outlet end of the return pipe connector decreases rapidly, which makes the inner wall of the return pipe susceptible to cavitation damage. Furthermore, during the operation of the ammonia-hydrogen dual-fuel cyclone jet, there are high-frequency vibrations and sudden temperature changes. Traditional return pipe connectors rely on clamps, bolts, and other fixing methods, which are prone to loosening and falling off due to vibration. In view of this, the present invention proposes a return pipe connector for ammonia-hydrogen dual-fuel cyclone jets. Summary of the Invention

[0004] In view of the above-mentioned shortcomings of the prior art, the present invention provides a return pipe joint for an ammonia-hydrogen dual-fuel cyclone jet, which can effectively solve the damage to the inner wall of the return pipe caused by cavitation collapse due to the reduction in pipe diameter between the return pipe and the outlet end of the return pipe joint in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A return pipe connector for an ammonia-hydrogen dual-fuel cyclone jet includes a first pipe body and a second pipe body formed of a continuous material. Two second pipe bodies are arranged laterally, and the two second pipe bodies are respectively connected to both sides of the first pipe body. A third pipe body formed of a continuous material is connected to the lower part of the first pipe body. The third pipe body is arranged vertically. The connector also includes: The mounting tube is fitted onto the outside of the second tube body. The end of the mounting tube near the first tube body has a first outer diameter, and the end of the mounting tube away from the first tube body has a second outer diameter. The first outer diameter is larger than the second outer diameter. An expansion and support mechanism is connected to the end of the second tube body away from the first tube body; wherein, the expansion and support mechanism includes several support plates, the support plates being rotatably connected to the end of the second tube body via a torsion elastic element; in the state where the return pipe is not connected, adjacent support plates are in contact with each other so that the inner walls of the several support plates form a tubular structure; after the return pipe is installed, the several support plates rotate relative to the second tube body to expand and support the return pipe sleeved on the outside of the second tube body.

[0006] Furthermore, a support protrusion is provided at the end of the outer wall of the support plate away from the second tube body, and the part of the support protrusion that contacts the return pipe has a smooth transition structure.

[0007] Furthermore, a flexible transmission cable is connected to the outer wall of the support plate, with one end of the flexible transmission cable away from the support plate facing the first tube and sliding through the second tube; A slider is connected to one end of the flexible transmission cable near the first tube. A groove is provided on the outer wall of the second tube corresponding to the slider. The slider is slidably disposed in the corresponding groove and does not detach from the groove.

[0008] Furthermore, the outer wall of the second tube is also provided with a sealing and locking mechanism, which includes a movable ring that is slidably sleeved on the outside of the second tube. When the movable ring moves toward the first tube, it can push the slider to move along the slide groove. The outer wall of the movable ring is evenly provided with several extrusion wing plates, and the end of the extrusion wing plate is fixedly provided with a positioning pressure head; when the return pipe is not connected, the positioning pressure head is located on the outside of the installation pipe; after the return pipe is installed, the positioning pressure head is adapted to the outer wall of the return pipe.

[0009] Furthermore, a locking seat is fixedly provided on the outer wall of the second tube, and the locking seat is located on the side of the movable ring closer to the first tube; The locking seat has a locking cavity on the side facing the movable ring. When the movable ring moves toward the first tube body, it can enter the locking cavity to lock the return pipe.

[0010] Furthermore, the outer wall of the second tube is provided with an annular groove, which corresponds to the positioning pressure head when the return pipe is locked.

[0011] Furthermore, the movable ring has a receiving cavity on the side facing the support plate, and a limit arm is rotatably installed in the receiving cavity; A compression elastic element is provided between the end of the limiting arm away from the support plate and the inner wall of the accommodating cavity. When the return pipe is not connected, the limiting arm is squeezed against the side wall of the compression wing plate by the compression elastic element. After the return pipe is installed, the limiting arm is squeezed by the compression elastic element and cooperates with the compression wing plate to lock the return pipe.

[0012] Furthermore, a locking tongue is fixedly provided at one end of the limiting arm near the support plate; The outer wall of the second tube is provided with a locking groove corresponding to the limiting rotating arm and the locking tongue. When the return pipe is not connected, the locking tongue is restricted in the locking groove.

[0013] Furthermore, a support plate is provided above the second tube, the support plate is connected to the first tube, and a limit mechanism is provided on the inner side of the support plate; The limiting mechanism includes: A limiting drive plate is slidably disposed within the bearing plate along the vertical direction; A supporting elastic element is connected to the bottom end of the limiting drive plate; A limiting claw is connected to the bottom end of the limiting drive plate and is positioned facing the support plate. A clearance groove is provided on the side of the bearing plate near the support plate. A limiting locking groove is provided through the movable ring corresponding to the clearance groove. The limiting claw can slide vertically in the clearance groove and the limiting locking groove. After the return pipe is installed, the limiting claw passes through the clearance groove and locks into the limiting locking groove.

[0014] Furthermore, the outer walls of the plurality of support plates are fitted with the same flexible ring, wherein at least one of the outer walls of the support plate is connected to the inner wall of the flexible ring; The flexible ring has an annular elastic element inside.

[0015] The technical solution provided by this invention has the following advantages compared with known public technologies: This invention features an expansion mechanism that works in conjunction with a rubber return pipe to create a targeted cavitation protection system. Specifically, after the return pipe is connected to the second pipe body, the support plate gradually deflects outward, creating a diameter-expanding buffer zone inside the return pipe near the end of the second pipe body. When incompletely injected fuel flows back from the ammonia-hydrogen dual-fuel swirl jet to this buffer zone, the flow velocity is effectively buffered before entering the second pipe body, preventing cavitation bubbles from forming due to a sudden increase in flow velocity and reducing the occurrence of cavitation.

[0016] This technical solution achieves a convenient and secure connection between the return pipe and the second pipe body through multi-structure collaborative design, while ensuring a sealing and anti-detachment effect: During the connection stage, the installation pipe guides the opening end of the return pipe to gradually open by using the gradually increasing outer diameter, eliminating the need for manual forced connection, reducing the difficulty of operation and avoiding damage to the rubber tube. Moreover, the return pipe deforms with the installation pipe under its own elasticity, initially improving the connection tightness. During the advancement of the return pipe, its end squeezes the limiting rotating arm, causing the locking tongue to disengage from the locking groove, automatically releasing the initial fixation of the movable ring without affecting the connection operation. The movement of the movable ring drives the slider and the flexible transmission cable to link together, so that the support plate supports the return pipe. The compression between the support protrusion and the inner wall of the return pipe further improves the connection strength. In terms of sealing and preventing detachment, after the movable ring is inserted into the locking seat, the locking seat squeezes the squeezing wing plate, and the positioning pressure head presses the return pipe against the outer wall of the second pipe body. Under the squeezing of the squeezing wing plate and the action of the ring groove, the return pipe forms a depression, forming a wave-shaped sealing structure with the outer wall of the side pipe, which greatly improves the sealing performance at the joint. At the same time, the locking action of the limiting claw and the limiting locking groove limits the position of the movable ring, indirectly fixing the slider and the support plate. Combined with the limiting action of the installation pipe, it minimizes the risk of the return pipe falling off during use. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 For the present invention Figure 1 Enlarged structural diagram at point A in the middle; Figure 3 This is a schematic cross-sectional view of the second tube body of the present invention; Figure 4 This is a schematic diagram showing the positional relationship between the support plate and the movable ring of the present invention; Figure 5 This is a schematic cross-sectional view of the movable ring structure of the present invention; Figure 6 This is a schematic diagram of the second tube body half-section structure of the present invention; Figure 7 This is a cross-sectional view of the locking seat structure of the present invention; Figure 8 This is a schematic diagram of the flexible ring cross-sectional structure of the present invention.

[0019] The labels in the diagram represent: 110, first pipe body; 120, second pipe body; 121, sliding groove; 122, annular groove; 123, locking groove; 130, third pipe body; 140, mounting pipe section; 150, bearing plate; 151, clearance groove. 200. Expansion support mechanism; 210. Support plate; 211. Support protrusion; 220. Torsional elastic element; 230. Flexible ring; 240. Annular elastic element; 250. Flexible transmission cable; 260. Slider; 270. Hinge shaft; 300. Locking mechanism; 310. Moving ring; 311. Limiting slot; 312. Receiving cavity; 320. Extrusion wing plate; 321. Positioning pressure head; 330. Locking seat; 331. Locking cavity; 332. Receiving groove; 340. Limiting swing arm; 341. Locking tongue; 350. Extrusion elastic element; 400. Limiting mechanism; 410. Limiting drive plate; 420. Supporting elastic element; 430. Limiting claw. 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, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0021] It should be noted that, in order to clearly show the internal structure, no section lines have been applied to the sectional views in the accompanying drawings of the technical solution of this application.

[0022] Ammonia-hydrogen dual-fuel cyclone jet return pipe connector, such as Figure 1As shown, it includes a first tube 110 formed of continuous material and a second tube 120 formed of continuous material. Two second tubes 120 are arranged in the horizontal direction and are respectively connected to both sides of the first tube 110. A third tube 130 formed of continuous material is connected to the lower part of the first tube 110 and is arranged in the vertical direction. In a specific example of this application, the ammonia-hydrogen dual-fuel cyclone jet reflux pipe connector further includes an installation pipe portion 140 and a support mechanism 200. The installation pipe portion 140 is sleeved on the outside of the second pipe body 120. The end of the installation pipe portion 140 near the first pipe body 110 has a first outer diameter, and the end of the installation portion away from the first pipe body 110 has a second outer diameter, wherein the first outer diameter is larger than the second outer diameter. The support mechanism 200 is connected to the end of the second pipe body 120 away from the first pipe body 110. The support mechanism 200 includes several support plates 210, which are rotatably connected to the end of the second pipe body 120 via a torsion elastic member 220. In the unconnected state of the reflux pipe, adjacent support plates 210 contact each other so that the inner walls of the several support plates 210 form a tubular structure. After the reflux pipe is installed, the several support plates 210 rotate relative to the second pipe body 120 to expand and support the reflux pipe sleeved on the outside of the second pipe body 120.

[0023] The first pipe body 110, the second pipe body 120, and the installation pipe section 140 are made of steel, while the third pipe body 130 is made of plastic. This combination of steel and plastic construction achieves a perfect balance between structural reliability and monitoring accuracy. The steel body possesses excellent structural strength and pressure resistance, enabling it to withstand the high-pressure working environment of the return pipeline and ensuring the structural stability and load-bearing capacity of the device during long-term use. The plastic pipe used to connect to the external pressure gauge not only possesses corrosion resistance and lightweight characteristics, adapting to complex working media environments, but also effectively avoids interference from metal materials on the pressure gauge's measurement accuracy. This ensures the pressure gauge accurately reflects the pressure status of the return pipeline, providing a reliable data foundation for fault diagnosis and further enhancing the overall practical value of the device.

[0024] In the above technical solution, the return pipe connector of the ammonia-hydrogen dual-fuel cyclone injector is connected between the ammonia-hydrogen dual-fuel cyclone injector and the fuel tank. During connection, one of the second pipe bodies 120 of this device is connected to the return pipe on the ammonia-hydrogen dual-fuel cyclone injector, and the other second pipe body 120 is connected to the return pipe on the fuel tank. The third pipe body 130 is connected to an external pressure gauge to detect the pressure in the return pipe, used to diagnose whether the back pressure is too high or the filter is clogged. In the above description of the technical solution, the state in which the corresponding second pipe body 120 is not connected to the corresponding return pipe is considered the first state, and the state in which the corresponding return pipe is connected and fixed to the outside of the second pipe body 120 is considered the second state. During operation, the fuel in the fuel tank is precisely injected after fuel delivery, cyclone atomization, and mixing adjustment. Fuel that is not fully injected flows back to the fuel tank through the return pipe connector of the ammonia-hydrogen dual-fuel cyclone injector.

[0025] During the installation of the return pipe, the return pipe is pushed in from the outside of the second pipe body 120. For rubber return pipes, during the pushing process, the return pipe passes through the expansion mechanism 200 and the installation pipe section 140. Since the end of the installation pipe section 140 near the first pipe body 110 has a first outer diameter and the end of the installation pipe section 140 away from the second pipe body 120 has a second outer diameter, and the first outer diameter is larger than the second outer diameter, in the specific example of this application, the outer diameter of the installation pipe section 140 is defined as gradually decreasing from the first outer diameter to the second outer diameter. The structure allows the open end of the rubber return tube to be gradually opened under the action of the mounting tube 140 when it is sleeved on the outside of the second tube body 120, making it convenient to sleeve the return tube on the outside of the second tube body 120. In addition, during the process of pushing the rubber return tube in, under the action of the mounting tube 140 with its gradually increasing outer diameter, the outer diameter of the return tube can be adapted to the outer diameter of the mounting tube 140 due to the elasticity of the return tube itself, thereby improving the tightness of the connection between the return tube and the second tube body 120 and preventing the return tube from detaching from the second tube body 120 during use.

[0026] In addition, in the above technical solution, the expansion mechanism 200 includes several support plates 210. When the return pipe is not installed, the multiple support plates 210 are close to each other, which facilitates the insertion of the return pipe. When the return pipe is installed and fixed on the outer wall of the second pipe body 120, the multiple support plates 210 rotate relative to the second pipe body 120. Specifically, the rotation is such that the ends away from the second pipe body 120 move away from each other, so that the outer edge of the end of the support plate 210 away from the second pipe body 120 abuts against and gradually expands the inner wall of the return pipe.

[0027] In the above technical solution, the support plate 210 is connected to the end of the second tube 120 via a torsional elastic element 220. Specifically, the support plate 210 is rotatably connected to the end of the second tube 120 via a hinge shaft 270. The torsional elastic element 220 is sleeved in the middle of the hinge shaft 270, so that when the support plate 210 needs to rotate to expand the inner diameter of the return pipe, external force causes multiple support plates 210 to compress the torsional elastic element 220 and rotate. When the return pipe needs to be detached from the outer wall of the second tube 120, under the action of the torsional elastic element 220, multiple support plates 210 rotate in opposite directions until adjacent support plates 210 contact and re-form a tubular structure for easy reconnection of the return pipe. The torsional elastic element 220 is a component that allows the support plate 210 to rotate under external force and can drive the support plate 210 to rotate in opposite directions again after the return pipe is detached. For example, in a specific example of this application, the torsional elastic element 220 is a torsion spring.

[0028] The expansion support mechanism 200 and the rubber return pipe work together to construct a targeted cavitation protection system. Specifically, after the return pipe is connected to the second pipe body 120, the support plate 210 gradually deflects outward, forming an expansion buffer zone inside the return pipe near the end of the second pipe body 120. When the fuel that has not been fully injected flows back from the ammonia-hydrogen dual-fuel swirl jet to this buffer zone, the flow velocity is effectively buffered before entering the second pipe body 120, avoiding the precipitation of cavitation bubbles caused by a sudden increase in flow velocity and reducing the occurrence of cavitation.

[0029] In a specific example, such as Figure 1 and Figure 2 As shown, a support protrusion 211 is provided at the end of the outer wall of the support plate 210 away from the second tube body 120. The part of the support protrusion 211 that contacts the inner wall of the return tube has a smooth transition structure. When multiple support plates 210 rotate relative to the second tube body 120 to expand the return tube, the support protrusion 211 contacts the return tube with its smooth transition structure, avoiding damage to the inner wall of the return tube during the expansion process.

[0030] It should also be noted that, as Figure 1 and Figure 8As shown, a flexible ring 230 is fitted onto the outer wall of multiple support plates 210, with at least one of the support plates 210's outer wall connected to the inner wall of the flexible ring 230; an annular elastic element 240 is provided inside the flexible ring 230. The flexible ring 230 and the annular elastic element 240 prevent damage to the inner wall of the return pipe caused by sudden rotation of the support plates 210 under external force. Furthermore, they work in conjunction with the torsional elastic element 220 to cause the support plates 210 to rotate in the opposite direction after the return pipe detaches, thus forming a tubular structure. Thirdly, the flexible ring 230 maintains its annular structure under the support of the annular elastic element 240, and together with the installation pipe section 140, provides end support for the expansion of the return pipe, preventing a wavy outer wall at the expansion point. This further prevents cavitation damage to the inner wall of the return pipe at the joints of the support plates 210, further ensuring the structural integrity of the return pipe and the long-term stable operation of the pipeline system.

[0031] In the above technical solution, the flexible ring 230 is a component that deforms under tension when the support plate 210 is in an expanded state and can recover when the support plate 210 returns to its original state. In actual use, components such as rubber rings, silicone rings, or ring springs can be selected. To prevent displacement of the flexible ring 230 on the outer wall of the support plate 210 in the expanded state, thus affecting the recovery of the support plate 210, at least one of the support plate 210 outer walls is fixedly connected to the flexible ring 230. Of course, to ensure the relative stability of the flexible ring 230, a scheme can be adopted where the outer walls of two opposing support plates 210 are connected to the flexible ring 230. For ease of use... The flexible ring 230 is connected to the outer wall of one of the support plates 210. The inner wall of the flexible ring 230 can be set to a shape that matches the outer wall of the support plate 210. The annular elastic element 240 can help the flexible ring 230 recover after the return pipe is detached. On the other hand, it can maintain the annular structure of the flexible ring 230 during the expansion of the return pipe by the support plate 210, so as to cooperate with the installation pipe part 140 to form two-end support for the expansion position of the return pipe. In specific use, the annular elastic element 240 can be made of the same material as the flexible ring 230 and integrally formed with the flexible ring 230, or an annular spring embedded in the flexible ring 230 can be used.

[0032] In a specific example of the above technical solution, a flexible transmission cable 250 is connected to the outer wall of the support plate 210. The end of the flexible transmission cable 250 away from the support plate 210 faces the first tube 110 and slides through the second tube 120. A slider 260 is connected to the end of the flexible transmission cable 250 near the first tube 110. A groove 121 is provided on the outer wall of the second tube 120 corresponding to the slider 260. The slider 260 is slidably disposed in the corresponding groove 121 and does not detach from the groove 121.

[0033] By setting up the flexible transmission cable 250 and the slider 260, when the return pipe is pushed into the second pipe body 120, the end of the return pipe will push the slider 260 to slide. The slider 260 pulls the corresponding support plate 210 to rotate through the flexible traction cable, so that the support plate 210 expands the inner wall of the return pipe.

[0034] In the above scheme, the flexible transmission cable 250 mainly pulls the support plate 210 through the sliding of the slider 260, and can pull the slider 260 to slide towards one side of the support plate 210 during the return of the support plate 210. In actual work, a flexible metal wire can be used. The slider 260 not leaving the slide groove 121 in the above scheme means that the slider 260 can always move along the slide groove 121 in a stable posture during the sliding process to maintain effective traction on the support plate 210. In the specific working process, both the slider 260 and the slide groove 121 can be set as T-shaped structures, which can ensure that the slider 260 always moves stably in the slide groove 121.

[0035] In the above technical solution, during the process of pushing the return pipe into the second pipe body 120, the outer diameter of the mounting pipe section 140 gradually increases. Under the action of the mounting pipe section 140, the return pipe can tightly adhere to the mounting pipe section 140 and the outer wall of the second pipe body 120. At this time, the slider 260 stably abuts against the side wall of the return pipe, and the support plate 210 can provide stable support for the outer wall of the return pipe. To further ensure the tightness of the return pipe installation, such as Figure 3 and Figure 4 As shown, the outer wall of the second tube 120 is also provided with a sealing and locking mechanism 300. The sealing and locking mechanism 300 includes a movable ring 310 that is slidably sleeved on the outside of the second tube 120. When the movable ring 310 moves toward the first tube 110, it can push the slider 260 to move along the slide groove 121. Several extrusion wing plates 320 are evenly arranged on the outer wall of the movable ring 310. A positioning pressure head 321 is fixedly provided at the end of the extrusion wing plate 320. In the first state, the positioning pressure head 321 is located on the outside of the mounting tube 140. In the second state, the positioning pressure head 321 is adapted to the outer wall of the return tube. A locking seat 330 is fixedly provided on the outer wall of the second tube 120. The locking seat 330 is located on the side of the movable ring 310 close to the first tube 110. A locking cavity 331 is opened on the side of the locking seat 330 facing the movable ring 310. When the movable ring 310 moves toward the first tube 110, it can enter the locking cavity 331 to lock the return tube.

[0036] The locking mechanism 300 can lock the return pipe installed on the outside of the second pipe body 120, ensuring the stability of the installation of the return pipe and the second pipe body 120, so that the return pipe will not fall off the second pipe body 120 even under the impact of high-flow-rate ammonia-hydrogen fuel. During the installation of the return pipe, the end of the return pipe is pushed into the second pipe body 120 by the support plate 210. When the return pipe touches the movable ring 310, the return pipe drives the movable ring 310 to move. At this time, the movable ring 310 pushes the slider 260, so that the slider 260 can still effectively pull the support plate 210 through the flexible transmission cable 250 to form a buffer zone in the return pipe. During the movement of the movable ring 310, it gradually approaches the locking seat 330 and enters the locking cavity 331. During the process of the movable ring 310 entering the locking cavity 331, under the action of the inner wall of the locking cavity 331, the extrusion wing plate 320 gradually approaches the return pipe outside the second pipe body 120. The outer side of the extrusion wing plate 320 is set on the positioning pressure head 321. The positioning pressure head 321 gradually touches and presses the return pipe to lock the return pipe on the outer wall of the second pipe body 120.

[0037] In the above technical solution, in order to ensure the locking effect of the positioning head 321 on the return pipe, the positioning head 321 is adapted to the outer wall of the second pipe body 120; that is, the outer wall of the second pipe body 120 is cylindrical in shape, and the end of the positioning head 321 corresponding to the second pipe body 120 is arc-shaped, so that when the return pipe is locked, the positioning head 321 can fit tightly against the outer wall of the return pipe and press the return pipe against the outer wall of the second pipe body 120.

[0038] To further improve the fixing effect of the locking mechanism on the return pipe, an annular groove 122 is provided on the outer wall of the second pipe body 120. The annular groove 122 corresponds to the positioning pressure head 321 when the return pipe is locked. In the above technical solution, the length of the extrusion wing plate 320 is greater than the axial length of the movable ring 310, avoiding damage to the return pipe caused by extrusion in an excessively narrow position. When the extrusion wing plate 320 is gradually squeezed by the inner wall of the locking cavity 331, the positioning pressure head 321 squeezes the return pipe and corresponds to the annular groove 122. This allows the return pipe to not only fit tightly against the outer side of the second pipe body 120, but also the recess at the annular groove 122 causes the return pipe to have the same recess, forming a wavy sealing structure at the joint between the return pipe and the outer wall of the second pipe body 120. This further improves the connection strength between the return pipe and the second pipe body 120 and prevents the return pipe from falling off.

[0039] In the above scheme, when the movable ring 310 gradually enters the locking cavity 331, the slider 260 gradually presses against the inner wall of the locking seat 330 under the action of the movable ring 310. In order to fully compress the extrusion wing plate 320, the inner wall of the locking seat 330 and the slider 260 are provided with receiving grooves 332 respectively. The slider 260 can be gradually pushed into the receiving grooves 332 by the push of the movable ring 310.

[0040] In the aforementioned technical solution, the movable ring 310 is slidably disposed on the outer wall of the second tube body 120. When the return pipe is installed, it is pushed by the return pipe and gradually moves towards the locking seat 330. However, when the return pipe is not installed, the movable ring 310 can move freely within its sliding range. This causes the movable ring 310 to move multiple times during transportation and handling, which may cause collisions to the second tube body 120 and the mounting tube section 140. Therefore, in a specific example of this application, such as Figure 4 and Figure 5 As shown, the movable ring 310 has a receiving cavity 312 on the side facing the support plate 210, and a limiting arm 340 is rotatably arranged inside the receiving cavity 312; a compression elastic element 350 is provided between the end of the limiting arm 340 away from the support plate 210 and the inner wall of the receiving cavity 312. In the first state, the limiting arm 340 is compressed by the compression elastic element 350 and abuts against the side wall of the compression wing plate 320. A locking tongue 341 is fixedly provided at the end of the limiting arm 340 near the support plate 210; a locking groove 123 is provided on the outer wall of the second tube 120 corresponding to the limiting arm 340 and the locking tongue 341. In the first state, the locking tongue 341 is restricted in the locking groove 123.

[0041] In the above technical solution, in the first state where the outer side of the second tube 120 is not connected to a return pipe, the locking tongue 341 at one end of the limiting arm 340 is inserted into the locking groove 123, and the other end of the limiting arm 340 away from the locking tongue 341 is pressed against the outer side of the extrusion wing plate 320 by the extrusion elastic element 350. Under the action of the locking tongue 341 and the extrusion elastic element 350, the movement of the extrusion wing plate 320 is restricted, that is, the movement of the movable ring 310 is restricted at this time, avoiding unnecessary movement of the movable ring 310; while when the outer end of the second tube 120 is connected to a return pipe, when the return pipe is pushed in At the movable ring 310, under the push of the return pipe, the limiting arm 340 rotates, causing the locking tongue 341 to disengage from the locking groove 123. Subsequently, the movable ring 310 moves further until it abuts against the locking seat 330, and the return pipe is tightly attached to the outer wall of the second pipe body 120. At this time, the return pipe is kept sealed by the special variable diameter outer wall of the installation pipe section 140 on the one hand, and is squeezed by the positioning pressure head 321 on the other hand. At the same time, the end of the limiting arm 340 away from the locking tongue 341 is pressed against the inner wall of the return pipe by the compression elastic element 350, which further ensures the stability of the return pipe installation.

[0042] In the first state, the compression elastic element 350 presses against the limiting rotating arm 340, so that the locking tongue 341 at one end of the limiting rotating arm 340 is inserted into the locking groove 123, while the other end of the limiting rotating arm 340 abuts against the compression wing plate 320 to restrict the movement of the movable ring 310. In the second state, the compression elastic element 350 is compressed by compression, so that the limiting rotating arm 340 can rotate to disengage the locking tongue 341 from the locking groove 123. At this time, the compression elastic element 350 still presses against the limiting rotating arm 340, so that the limiting rotating arm 340 presses against the inner wall of the return pipe to restrict the return pipe. That is, the compression elastic element 350 is a component with elastic recovery performance. In actual use, a spring can be selected as the compression elastic element 350.

[0043] Based on the foregoing explanation, in the first state, the locking tongue 341 and the compression elastic element 350 restrict unnecessary movement of the movable ring 310; in the second state, the locking tongue 341 disengages from the locking groove 123, and the inner and outer walls of the return pipe are clamped between the compression wing plate 320 and the limiting rotating arm 340, preventing the return pipe from detaching from the second pipe body 120.

[0044] That is, in the above technical solutions, such as Figure 6 and Figure 7 As shown, the movement of the movable ring 310 in the second state is restricted by the extrusion wing plate 320 and the locking cavity 331. To prevent the extrusion wing plate 320 from disengaging from the locking cavity 331 in the second state, a limiting mechanism 400 is also provided in the technical solution of this application. Specifically, a support plate 150 is provided above the second tube 120, and the support plate 150 is located at both ends of the first tube 110. The limiting mechanism 400 is located at the support plate 150. The limiting mechanism 400 includes: a limiting drive plate 410, which is slidably disposed vertically within the support plate 150; a supporting elastic element 420, which is connected to the bottom end of the limiting drive plate 410; and a limiting claw 430, which is connected to the bottom end of the limiting drive plate 410 and is positioned towards the support plate 210, with one end of the limiting claw 430 facing the support plate 210. The upper end is a sloping sidewall, and its height increases with the distance from the support plate 210. The bearing plate 150 has a relief groove 151 on the side near the support plate 210. The locking seat 330 has a through groove corresponding to the relief groove 151. The movable ring 310 has a limit locking groove 311 corresponding to the relief groove 151. The limit locking claw 430 can slide vertically in the relief groove 151, the through groove and the limit locking groove 311. In the second state, the limit locking claw 430 passes through the relief groove 151 and the through groove and is locked in the limit locking groove 311.

[0045] With the setting of the limiting mechanism 400, when the movable ring 310 moves toward the locking seat 330, the limiting locking groove 311 on the movable ring 310 is aligned with the relief groove 151 opened on the bearing plate 150. At this time, the limiting claw 430 passes through the relief groove 151 and the limiting locking groove 311 and is locked in the limiting locking groove 311 to fix the movable ring 310.

[0046] When it is necessary to disconnect the return pipe from the second pipe body 120, the vertically squeezed limiting drive plate 410 is used. At this time, the supporting elastic element 420 is compressed, and the limiting drive plate 410 moves downward, causing the limiting claw 430 to move downward to release the engagement with the limiting locking groove 311. At this time, the movable ring 310 can move away from the locking seat 330.

[0047] In the above scheme, the supporting elastic element 420 can support the limiting drive plate 410 on the one hand, so that the limiting claw 430 is engaged at the limiting slot 311. On the other hand, it can deform under compression, so that the limiting drive plate 410 can move. In actual use, a spring can be used as the supporting elastic element 420.

[0048] The above technical solutions enable the assembly and disassembly process to automatically adapt to the connection and disassembly of the return pipe, eliminating the need for complex operations and additional tools, and significantly improving construction and maintenance efficiency. During installation, the return pipe can automatically complete a series of actions such as the deflection of the limit arm 340, the unlocking of the locking tongue 341, the movement of the movable ring 310, and the opening of the support plate 210, without the need for manual step-by-step operation. The limit claw 430 of the limit mechanism 400 automatically moves down under the pressure of the movable ring 310. After the movable ring 310 is in place, it automatically resets and engages through the support elastic element 420, achieving automatic limit fixation of the movable ring 310. During disassembly, simply press down on the limit drive plate 410 from above the bearing plate 150 to quickly release the engagement limit between the limit claw 430 and the limit engagement slot 311. The movable ring 310 is indirectly pulled by the slider 260 under the rebound force of the support plate 210, thereby automatically releasing the fixation of the end of the return pipe by the limit mechanism 400, facilitating the quick removal of the return pipe.

[0049] The ammonia-hydrogen dual-fuel cyclone jet reflux pipe connector described in this application is connected between the ammonia-hydrogen dual-fuel cyclone jet and the fuel tank during use. During connection, one end of the second pipe 120 of this device is connected to the rubber reflux pipe on the ammonia-hydrogen dual-fuel cyclone jet, and the other end of the second pipe 120 is connected to the rubber reflux pipe on the fuel tank. Then, the third pipe 130 is connected to an external pressure gauge.

[0050] When the return pipe is sleeved on the outside of the second pipe body 120, under the action of the mounting pipe section 140, the open end of the return pipe can be gradually opened by its gradually increasing outer diameter, which makes it easier to sleeve the return pipe onto the end of the second pipe body 120. The mounting pipe section 140 is set to gradually increase in outer diameter, so that the return pipe also forms a shape with gradually increasing outer diameter at the end of the second pipe body 120 under its own elasticity, which improves the tightness of the connection between the return pipe and the second pipe body 120 and prevents the return pipe from detaching from the second pipe body 120 during use.

[0051] As the end of the return pipe advances towards the first pipe body 110, its end inserts into the gap between the movable ring 310 and the extrusion wing plate 320. Under the extrusion of the end of the return pipe, the end of the limiting arm 340 away from the support plate 210 overcomes the elastic force of the extrusion elastic element 350 and is pressed into the receiving cavity 312. The locking tongue 341 fixedly provided at the end of the limiting arm 340 will be rotated out of the locking groove 123 as the limiting arm 340 rotates, and finally rotates into the receiving cavity 312, without affecting the movable ring 310. The subsequent movement of the moving ring 310 can be achieved by releasing the locking tongue 341 and locking groove 123 from limiting the position of the moving ring 310 through this structure. When the device is not in use, the two are used to fix the moving ring 310 to prevent it from sliding back and forth and causing wear. After the limiting arm 340 rotates into the receiving cavity 312, the end away from the support plate 210 will have an outward rotation tendency under the action of the support elastic member 420. This tendency, in conjunction with the extrusion wing plate 320, can achieve the clamping and fixing of the opening end of the return pipe.

[0052] In the first state, the end of the extrusion wing plate 320 near the support plate 210 is bent outwards, so the positioning pressure head 321 will not affect the insertion of the return pipe. As the return pipe continues to advance along the outside of the second pipe body 120 towards the first pipe body 110, the movable ring 310 will also move synchronously. Then, the side wall of the movable ring 310 will contact multiple sliders 260, and by pushing the sliders 260, the sliders 260 will pull the support plate 210 through the flexible transmission cable 250. Subsequently, the support plate 210 will be pulled away from the elastic force of the torsional elastic element 220 and move away from the second pipe body 120. One end will deflect outward and support the return pipe inside the return pipe, thereby forming a larger diameter area inside the return pipe near the opening end of the second pipe body 120. This area can improve the connection strength between the second pipe body 120 and the return pipe by squeezing the support protrusion 211 at the end of the support plate 210 against the inner wall of the return pipe, and can also serve as a buffer by supporting the enlarged diameter part inside the return pipe. When the incompletely injected fuel flows through the buffer at the inlet, its flow rate will be buffered in the buffer before entering the second pipe body 120, thereby reducing the occurrence of some cavitation phenomena.

[0053] Meanwhile, a flexible ring 230 is also sleeved between the ends of the multiple support plates 210. By expanding the flexible ring 230 through the multiple support plates 210, the outer wall of the flexible ring 230 fits against the inner wall of the return pipe. The flexible ring 230 is supported by an annular elastic element 240, which can maintain the annular structure after being expanded by the support plates 210, thereby supporting the return pipe. This ensures that one end of the return pipe at the expanded diameter position is supported by the installation pipe section 140, and the other end is supported by the flexible ring 230, preventing the wavy outer wall from appearing at the expanded diameter position of the return pipe and preventing the inner wall of the return pipe at the joint of the support plates 210 from being damaged by cavitation collapse.

[0054] As the return pipe pushes the movable ring 310 to continue moving, the movable ring 310 will insert into the locking seat 330. As the movable ring 310 goes deeper, the inner wall of the locking seat 330 will press the side wall of the extrusion wing plate 320 inward. The extrusion wing plate 320, through the positioning pressure head 321, will press the return pipe against the outer wall of the second pipe body 120. When the side wall of the movable ring 310 is in contact with the inner wall of the locking seat 330, multiple sliders 260 will be pressed into the receiving groove 332. On the other hand, the position of the positioning pressure head 321 will be... Corresponding to the annular groove 122, the return pipe is squeezed by the positioning pressure head 321 and restricted by the movable ring 310. In addition, the indentation at the annular groove 122 causes the rubber return pipe to indent simultaneously. This not only achieves full fit with the outer wall of the second pipe body 120, but also forms a wave-shaped sealing structure at the joint between the opening end of the return pipe and the outer wall of the second pipe body 120. This effectively improves the sealing performance at the opening end of the rubber return pipe. At the same time, it also improves the connection strength between the return pipe and the second pipe body 120, and minimizes the risk of the rubber return pipe falling off.

[0055] In addition, when the side wall of the movable ring 310 is in contact with the inner wall of the locking seat 330, the side wall of the movable ring 310 will cause the limiting claw 430 to move downward by squeezing the inclined side wall of the limiting claw 430. The limiting drive plate 410 will also move downward simultaneously by overcoming the elastic force of the supporting elastic member 420. After the inclined side wall of the limiting claw 430 completely passes through the limiting engagement groove 311, it will be lifted up by the supporting elastic member 420 together with the limiting drive plate 410. Then, the position of the movable ring 310 can be limited by the engagement of the limiting claw 430 and the limiting engagement groove 311. At the same time, the movable ring 310 also limits the slider 260 and the support plate 210.

[0056] After installation, the return pipeline begins to guide the fuel that was not fully injected after the work is completed from the ammonia-hydrogen dual-fuel swirl injector back to the fuel tank. The operator only needs to check the pressure gauge parameters periodically. When it is necessary to disassemble the connection between the return pipeline and the second pipe body 120, the limit drive plate 410 can be pressed down from above the support plate 150 to release the restriction of the limit mechanism 400 on the movable ring 310. This allows the movable ring 310 to be indirectly pulled by the slider 260 in the rebound of the support plate 210, thereby quickly releasing the sealing locking mechanism 300 from fixing the end of the rubber return pipeline.

[0057] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. 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. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A return pipe joint for an ammonia-hydrogen dual-fuel cyclone jet, comprising a first pipe body formed of a continuous material and a second pipe body formed of a continuous material, wherein two second pipe bodies are arranged laterally, and the two second pipe bodies are respectively connected to both sides of the first pipe body; a third pipe body formed of a continuous material is connected to the lower part of the first pipe body, and the third pipe body is arranged vertically, characterized in that, Also includes: The mounting tube is fitted onto the outside of the second tube body. The end of the mounting tube near the first tube body has a first outer diameter, and the end of the mounting tube away from the first tube body has a second outer diameter. The first outer diameter is larger than the second outer diameter. An expansion and support mechanism is connected to the end of the second tube body away from the first tube body; wherein, the expansion and support mechanism includes several support plates, the support plates being rotatably connected to the end of the second tube body via a torsion elastic element; in the state where the return pipe is not connected, adjacent support plates are in contact with each other so that the inner walls of the several support plates form a tubular structure; after the return pipe is installed, the several support plates rotate relative to the second tube body to expand and support the return pipe sleeved on the outside of the second tube body.

2. The ammonia-hydrogen dual-fuel cyclone jet return pipe connector according to claim 1, characterized in that, The outer wall of the support plate is provided with a support protrusion at the end away from the second tube body, and the part of the support protrusion that contacts the return pipe has a smooth transition structure.

3. The ammonia-hydrogen dual-fuel cyclone jet return pipe connector according to claim 1, characterized in that, The outer wall of the support plate is connected to a flexible transmission cable, with one end of the flexible transmission cable away from the support plate facing the first tube and sliding through the second tube. A slider is connected to one end of the flexible transmission cable near the first tube. A groove is provided on the outer wall of the second tube corresponding to the slider. The slider is slidably disposed in the corresponding groove and does not detach from the groove.

4. The ammonia-hydrogen dual-fuel cyclone jet return pipe connector according to claim 3, characterized in that, The outer wall of the second tube is also provided with a sealing and locking mechanism. The sealing and locking mechanism includes a movable ring that is slidably sleeved on the outside of the second tube. When the movable ring moves toward the first tube, it can push the slider to move along the slide groove. The outer wall of the movable ring is evenly provided with several extrusion wing plates, and the end of the extrusion wing plate is fixedly provided with a positioning pressure head; when the return pipe is not connected, the positioning pressure head is located on the outside of the installation pipe; after the return pipe is installed, the positioning pressure head is adapted to the outer wall of the return pipe.

5. The ammonia-hydrogen dual-fuel cyclone jet return pipe connector according to claim 4, characterized in that, A locking seat is fixedly provided on the outer wall of the second tube, and the locking seat is located on the side of the movable ring close to the first tube. The locking seat has a locking cavity on the side facing the movable ring. When the movable ring moves toward the first tube body, it can enter the locking cavity to lock the return pipe.

6. The ammonia-hydrogen dual-fuel cyclone jet return pipe connector according to claim 5, characterized in that, The outer wall of the second tube is provided with an annular groove, which corresponds to the positioning pressure head when the return pipe is locked.

7. The ammonia-hydrogen dual-fuel cyclone jet return pipe connector according to claim 4, characterized in that, The movable ring has a receiving cavity on the side facing the support plate, and a limit arm is rotatably installed in the receiving cavity; A compression elastic element is provided between the end of the limiting arm away from the support plate and the inner wall of the accommodating cavity. When the return pipe is not connected, the limiting arm is squeezed against the side wall of the compression wing plate by the compression elastic element.

8. The ammonia-hydrogen dual-fuel cyclone jet return pipe connector according to claim 7, characterized in that, A locking tongue is fixedly provided at one end of the limiting arm near the support plate; The outer wall of the second tube is provided with a locking groove corresponding to the limiting rotating arm and the locking tongue. When the return pipe is not connected, the locking tongue is restricted in the locking groove.

9. The ammonia-hydrogen dual-fuel cyclone jet return pipe connector according to claim 4, characterized in that, A support plate is provided above the second tube body, the support plate is connected to the first tube body, and a limit mechanism is provided on the inner side of the support plate; The limiting mechanism includes: A limiting drive plate is slidably disposed within the bearing plate along the vertical direction; A supporting elastic element is connected to the bottom end of the limiting drive plate; A limiting claw is connected to the bottom end of the limiting drive plate and is positioned facing the support plate. A clearance groove is provided on the side of the bearing plate near the support plate. A limiting locking groove is provided through the movable ring corresponding to the clearance groove. The limiting claw can slide vertically in the clearance groove and the limiting locking groove. After the return pipe is installed, the limiting claw passes through the clearance groove and locks into the limiting locking groove.

10. The ammonia-hydrogen dual-fuel cyclone jet return pipe connector according to any one of claims 1-9, characterized in that, The outer walls of multiple support plates are fitted with the same flexible ring, wherein at least one of the outer walls of the support plate is connected to the inner wall of the flexible ring; The flexible ring has an annular elastic element inside.

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