Tailpipe exhaust repair device

Abstract

The utility model relates to a tail nozzle exhaust repair device, include: platform subassembly, bottom flange frock, tail nozzle exhaust device, end cover, welding flange frock and top flange frock. The utility model has the advantages that: when welding the exhaust pipe parts, the top flange and the bottom flane are guaranteed concentric by setting the bottom flange frock, the position of the end cover can be rotatably adjusted by the adjusting bolt, the gap between the welds of the weld part can be adjusted by controlling the welding shrinkage during welding, so that the size of the heat affected zone generated during welding is adjustable, the airflow channel can guarantee the normal flow of the gas in the tail nozzle exhaust device, and the setting of the second three-way gas inlet pipe and the first three-way gas inlet pipe can guarantee the welding quality, so as to avoid a large number of cracks near the heat affected zone generated during welding and improve the welding quality.

Description

Technical Field

[0001] This utility model belongs to the field of tailpipe exhaust technology, and in particular relates to a tailpipe exhaust repair device. Background Technology

[0002] The main components of the exhaust nozzle are the end cap assembly, the airflow passage assembly, and the nozzle housing assembly, which are welded together to form a single unit. The exhaust nozzle is a complex structure welded from heat-resistant thin plates with axial symmetry. It operates in a high-temperature environment of around 600 degrees Celsius. During the entire engine operation, the exhaust nozzle is mainly subjected to its own inertial load and aerodynamic loads from the gas generator rotor, related casings, and the power turbine guide vanes.

[0003] However, due to the structure of the exhaust nozzle, it possesses a certain inherent vibration frequency. Under aerodynamic loads, the pressure inside the nozzle outlet cavity reaches approximately 112 kPa. At this pressure, a pressure difference is generated between the inner and outer cavities of the nozzle, reaching the excitation frequency and forcing vibration, resulting in resonance. Under the influence of high-temperature airflow impact and vibration, the welded joints of the various airflow channels inside the nozzle suffer from thermal corrosion, high-cycle fatigue, and low-cycle fatigue. Cracks may even appear at the welded joints, potentially causing exhaust gases to diffuse into the engine's vicinity, leading to leaks. The diffusion of high-temperature exhaust gases around the engine can generate heat radiation on fuel lines and the reduction gearbox, affecting normal engine operation and, in severe cases, causing engine damage and catastrophic accidents.

[0004] In the existing technology, based on the welding process of the tail nozzle airflow channel, the welding parts of each airflow channel inside the tail nozzle are mostly welded by manual argon arc welding. However, the grain structure of the heat-affected zone generated by this welding method is relatively coarse, which easily leads to numerous cracks around the heat-affected zone of the weld. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a tailpipe exhaust repair device.

[0006] This tailpipe exhaust repair device includes: a platform assembly, a bottom flange fixture, a tailpipe exhaust device, an end cap, a welding flange fixture, and a top flange fixture.

[0007] The bottom flange fixture is fixed to the top of the platform assembly, and the tail nozzle exhaust device is fixed to the top of the bottom flange fixture. The bottom flange fixture is used to ensure that the top flange and the bottom flange are concentric when welding the exhaust pipe parts. An end cap is provided at the top opening of the tail nozzle exhaust device. A weld is provided at the connection between the end cap and the tail nozzle exhaust device. The gap between the welds at the weld is adjusted by controlling the welding shrinkage during welding. A welding flange fixture is fixed to the top of the end cap by bolts. The top flange fixture is located above the welding flange fixture.

[0008] The bottom flange fixture includes a bottom flange and a guide post. The guide post is fixed to the center of the bottom flange and passes upward through the tailpipe exhaust device before being fixedly connected to the top flange fixture. The bottom flange ensures that the tailpipe exhaust device and the guide post are concentrically connected, and the bottom flange indirectly limits the position of the top flange fixture through the guide post. The bottom flange is used to ensure the stability of the tailpipe exhaust device and the guide post during installation, and also to ensure that the position of the top flange fixture does not change when subjected to external forces. The guide post can center the end cap and the welding flange fixture, ensuring that the tailpipe exhaust device, the end cap, and the welding flange fixture are always concentrically positioned.

[0009] An airflow channel is provided on the outer side of the middle part of the tail nozzle exhaust device. The airflow channel ensures the normal flow of gas inside the tail nozzle exhaust device. An airflow baffle is provided at the outlet of the airflow channel to block the airflow inside the airflow channel. A right-angle support column is fixedly installed on the outer side of the airflow baffle to stabilize the airflow baffle. The right-angle support column makes the airflow baffle unaffected by airflow and external forces. Multiple second three-way air inlets connected to the airflow channel are fixedly installed on the side of the airflow baffle away from the airflow channel. The second three-way air inlets are also fixedly connected to external air pipes, allowing the gas inside the airflow channel to flow normally.

[0010] The welding flange fixture is equipped with multiple adjusting bolts that are evenly distributed in a ring array and pass downward through the top flange fixture. The welding flange of the welding flange fixture is evenly provided with multiple threaded through holes that are evenly distributed in a ring array. The number of threaded through holes corresponds to the number of adjusting bolts. The adjusting bolts are screwed into the threaded through holes on the welding flange fixture. Multiple first three-way air inlets that are evenly distributed in a ring array are fixedly installed on the top of the welding flange to fill the exhaust device of the tail nozzle with air during welding, so as to ensure the welding quality.

[0011] As a preferred embodiment, the adjusting bolt raises or lowers the welded flange it is bolted to when it rotates, thereby adjusting the height of the welded flange; the welding flange fixture welded to the end cover can be rotated by rotating the adjusting bolt.

[0012] Preferably, the platform components include: a small flat platform and an adjustable pad with a telescopic length; the bottom edge of the small flat platform is fixedly connected to the adjustable pad for adjusting the height of the small flat platform, so that the height of the small flat platform can be adjusted according to the actual situation; the bottom of the adjustable pad is provided with a disc for increasing the contact area, the disc lengthens the contact area and further increases the stability of the tailpipe exhaust repair device when placed.

[0013] Preferably, the bottom flange fixture is fixed to the small flat surface on top of the platform assembly by bolts.

[0014] Preferably, the right-angle support column is fixed to the top of the platform assembly.

[0015] The beneficial effects of this utility model are:

[0016] When welding exhaust pipe components, a bottom flange fixture is used to ensure the concentricity of the top and bottom flanges. Specifically: the bottom flange ensures the stability of the exhaust nozzle and guide post during installation, and also ensures that the position of the top flange fixture does not change under external forces; the guide post provides centering for the end cap and welding flange fixture, ensuring that the exhaust nozzle, end cap, and welding flange fixture remain concentric at all times.

[0017] The position of the end cap can be adjusted by rotating the adjustable bolts; the gap between the welds in the weld area can be adjusted by controlling the welding shrinkage during welding, so that the size of the heat-affected zone generated during welding can be adjusted; at the same time, it can ensure the height dimension between the flanges of the tail nozzle exhaust device after welding.

[0018] The airflow channel ensures normal gas flow within the exhaust system of the tailpipe. The design of the second and first three-way air inlets ensures welding quality, preventing numerous cracks from appearing near the heat-affected zone during welding and improving overall welding quality. Attached Figure Description

[0019] Figure 1 A 3D view of the tailpipe exhaust repair device;

[0020] Figure 2 This is a side view of the middle section of the tailpipe exhaust repair device;

[0021] Figure 3 A 3D view of the guide post and bottom flange;

[0022] Figure 4 A 3D view of the welding flange fixture;

[0023] Figure 5 This is a 3D diagram of the platform components.

[0024] Explanation of reference numerals in the attached drawings: Platform component 100, small flat platform 110, adjusting pad 120, bottom flange fixture 200, bottom flange 210, guide column 220, tail nozzle exhaust device 300, airflow channel 310, airflow baffle 320, right angle support column 330, second tee air inlet pipe 340, end cap 400, weld seam 500, welding flange fixture 600, welding flange 610, threaded through hole 620, first tee air inlet pipe 630, top flange fixture 700, adjusting bolt 800. Detailed Implementation

[0025] The present invention will be further described below with reference to embodiments. The description of the embodiments below is only for the purpose of helping to understand the present invention. It should be noted that, for those skilled in the art, several modifications can be made to the present invention without departing from the principle of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0026] As one example, such as Figures 1 to 5 As shown, a tailpipe exhaust repair device includes: a platform assembly 100, a bottom flange fixture 200, a tailpipe exhaust device 300, an end cap 400, a welding flange fixture 600, and a top flange fixture 700.

[0027] Platform component 100 includes: a small flat platform 110 and adjustable pads 120 with extendable length. The small flat platform 110 provides an installation platform for the bottom flange fixture 200 and the tail nozzle exhaust device 300, and ensures the stability of the bottom flange fixture 200 and the tail nozzle exhaust device 300 after installation. Four adjustable pads 120 for adjusting the height of the small flat platform 110 are fixedly connected to the bottom edge of the small flat platform 110. The four adjustable pads 120 are fixed at the four corners of the bottom of the small flat platform 110, so that the height of the small flat platform can be adjusted according to the actual situation. The bottom of the adjustable pads 120 is provided with a disc for increasing the contact area. The disc increases the contact area and further increases the stability of the tail nozzle exhaust repair device when placed.

[0028] The bottom flange fixture 200 is bolted to the small flat platform 110 on the top of the platform assembly 100. The tail nozzle exhaust device 300 is fixed to the top of the bottom flange fixture 200. The bottom flange fixture is used to ensure that the top flange and the bottom flange are concentric when welding the exhaust pipe parts. An end cap 400 is provided at the top opening of the tail nozzle exhaust device 300. A weld seam 500 is provided at the connection between the end cap 400 and the tail nozzle exhaust device 300. The gap between the weld seams in the weld seam is adjusted by controlling the welding shrinkage during welding. A welding flange fixture 600 is bolted to the top of the end cap 400. The top flange fixture 700 is located above the welding flange fixture 600.

[0029] The bottom flange fixture 200 includes a bottom flange 210 and a guide post 220. The guide post 220 is fixed to the center of the bottom flange 210 and passes upward through the tail nozzle exhaust device 300 before being fixedly connected to the top flange fixture 700. The bottom flange 210 ensures that the tail nozzle exhaust device 300 and the guide post 220 are concentrically connected, and the bottom flange 210 indirectly limits the top flange fixture 700 through the guide post 220. The bottom flange is used to ensure the stability of the tail nozzle exhaust device and the guide post during installation, and also to ensure that the position of the top flange fixture does not change when subjected to external forces. The guide post can play a stabilizing role for the end cap and the welding flange fixture, and the guide post ensures that the tail nozzle exhaust device, the end cap, and the welding flange fixture are always concentrically positioned.

[0030] An airflow channel 310 is provided on the outer side of the middle part of the tail nozzle exhaust device 300. The airflow channel ensures the normal flow of gas in the tail nozzle exhaust device. An airflow baffle 320 is provided at the outlet of the airflow channel 310 to block the airflow flowing inside the airflow channel 310. A right-angle support column 330 is fixedly installed on the outer side of the airflow baffle 320 to stabilize the airflow baffle 320. The right-angle support column 330 is fixed to the top of the platform assembly 100. The right-angle support column makes the airflow baffle unaffected by airflow and external forces. Multiple second three-way air inlets 340 connected to the airflow channel 310 are fixedly installed on the side of the airflow baffle 320 away from the airflow channel 310. The second three-way air inlets 340 are also fixedly connected to external air pipes, allowing the gas inside the airflow channel to flow normally.

[0031] The welding flange fixture 600 is provided with multiple adjusting bolts 800 evenly distributed in a ring array and passing downward through the top flange fixture 700. The welding flange 610 of the welding flange fixture 600 is provided with multiple threaded through holes 620 evenly distributed in a ring array. The number of threaded through holes 620 corresponds to the number of adjusting bolts 800. The adjusting bolts 800 are screwed into the threaded through holes 620 on the welding flange fixture 600. When the adjusting bolts 800 are rotated, they drive the welding flange 610 screwed to them to rise or fall, so as to adjust the height of the welding flange 610. The welding flange fixture 600, which is welded to the end cover 400, can be rotated by rotating the adjusting bolts 800. The top of the welding flange 610 is fixedly installed with multiple first three-way air inlets 630 evenly distributed in a ring array, which fill the tail nozzle exhaust device 300 with air during welding to ensure welding quality.

[0032] When applying the exhaust pipe repair device: install a bottom flange fixture to ensure that the top and bottom flanges are concentric. This concentric position ensures that the top flange fixture will not change position under external force. Install guide pillars to center the end cap and welding flange fixture. Adjust the position of the end cap by rotating the height of the adjusting bolts, and control the weld shrinkage during welding to adjust the gap between welds at the weld joint, so that the size of the heat-affected zone generated during welding is the size of the heat-affected zone that only produces a few cracks / does not produce cracks during welding. Set up a second three-way vent pipe and a first three-way vent pipe for ventilation to ensure welding quality. The repaired exhaust pipe has a relatively strong weld, is resistant to heat corrosion, and is not prone to high-cycle fatigue and low-cycle fatigue.

Claims

1. A tailpipe exhaust repair device, characterized in that, include: Platform assembly (100), bottom flange fixture (200), tail nozzle exhaust device (300), end cap (400), welding flange fixture (600) and top flange fixture (700); The bottom flange fixture (200) is fixed to the top of the platform assembly (100), and the tail nozzle exhaust device (300) is fixed to the top of the bottom flange fixture (200); an end cap (400) is provided at the top opening of the tail nozzle exhaust device (300), and a weld seam (500) is provided at the connection between the end cap (400) and the tail nozzle exhaust device (300); a welding flange fixture (600) is installed on the top of the end cap (400); the top flange fixture (700) is located above the welding flange fixture (600). The bottom flange fixture (200) includes a bottom flange (210) and a guide post (220); the guide post (220) is fixed to the center of the bottom flange (210), and the guide post (220) passes upward through the tail nozzle exhaust device (300) and is fixedly connected to the top flange fixture (700); the bottom flange (210) makes the tail nozzle exhaust device (300) and the guide post (220) concentrically connected, and the bottom flange (210) indirectly limits the top flange fixture (700) through the guide post (220); An airflow channel (310) is provided on the outer side of the middle part of the tail nozzle exhaust device (300); an airflow baffle (320) is provided at the outlet of the airflow channel (310) to block the airflow inside the airflow channel (310); a right-angle support column (330) is fixedly installed on the outer side of the airflow baffle (320) to stabilize the airflow baffle (320); multiple second three-way air inlets (340) connected to the airflow channel (310) are fixedly installed on the side of the airflow baffle (320) away from the airflow channel (310); the second three-way air inlets (340) are also fixedly connected to an externally inserted air pipe; The welding flange fixture (600) is provided with a plurality of adjusting bolts (800) evenly distributed in a ring array and passing downward through the top flange fixture (700). The welding flange (610) of the welding flange fixture (600) is provided with a plurality of threaded through holes (620) evenly distributed in a ring array. The number of threaded through holes (620) corresponds to the number of adjusting bolts (800). The adjusting bolts (800) are screwed to the threaded through holes (620) on the welding flange fixture (600). The top of the welding flange (610) is fixedly installed with a plurality of first three-way air inlets (630) evenly distributed in a ring array, which are used to fill the exhaust device (300) of the tail nozzle during welding.

2. The exhaust pipe repair device according to claim 1, characterized in that: When the adjusting bolt (800) rotates, it causes the welded flange (610) screwed to it to rise or fall, so as to adjust the height of the welded flange (610); the welded flange fixture (600) welded to the end cover (400) can be rotated by rotating the adjusting bolt (800).

3. The exhaust pipe repair device according to claim 1, characterized in that, The platform component (100) includes: a small flat platform (110) and an adjustable pad (120) with a retractable length; the bottom edge of the small flat platform (110) is fixedly connected to the adjustable pad (120) for adjusting the height of the small flat platform (110); the bottom of the adjustable pad (120) is provided with a disc for increasing the contact area.

4. The tailpipe exhaust repair device according to claim 3, characterized in that, The bottom flange fixture (200) is fixed to the small flat platform (110) on top of the platform assembly (100).

5. The tailpipe exhaust repair device according to claim 1, characterized in that, The right-angle support column (330) is fixed to the top of the platform assembly (100).

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