Exhaust pipeline
By introducing an adjustable connecting section into the exhaust pipe of an aero-engine, the problems of uneven structural stress and flow resistance differences were solved, thus achieving the stability and efficient operation of the exhaust pipe.
Patent Information
- Application Number
- CN202520187617.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-06
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2035-02-06
AI Technical Summary
Existing aero-engine exhaust pipes suffer from uneven structural stress and flow resistance differences, making the pipes prone to deformation and rupture, which affects the engine's aerodynamic and cooling performance.
An adjustment connection section is introduced into the exhaust pipeline, including a special-shaped pipe, a reinforcing rod, and a valve plate. The reinforcing rod drives the valve plate to rotate to adjust the flow resistance, and intelligent control is achieved through a gas pressure sensor.
It effectively overcomes the problem of uneven structural stress, adjusts the flow resistance of the medium, and ensures the stable operation and high efficiency of the engine under complex working conditions.
Smart Images
Figure CN223594249U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of aero-engine, especially relates to an exhaust pipe line. BACKGROUND
[0002] The normal operation of an aero-engine cannot do without a pipe system, which bears the heavy responsibility of transmitting various media such as fuel, lubricating oil and air. Among them, most engine pipes adopt round profiles, while the exhaust pipe is relatively special, as it not only has large size and wide span, but also needs to consider many complex requirements. On the one hand, to meet the exhaust passage requirements, the exhaust pipe is designed to have a branch structure; on the other hand, due to the constraints of the engine envelope and limited space, the exhaust pipe must have a special structure. Figure 1 A structural diagram of an exhaust pipe of an aero-engine in the prior art is shown. As shown in the figure, the exhaust pipe 100 has a special structure and includes multiple branches 101.
[0003] However, in the design and manufacturing of the special exhaust pipe, many problems have been exposed. First, due to the structural characteristics of the special pipe, the deformation degree is large, which directly causes the pipe strength to be weak. Figure 2 A structural and strength simulation diagram of a ten-stage TBV exhaust pipe of an aero-engine in the prior art is shown. As shown in the figure, under the continuous action of the medium pressure, the exhaust pipe is prone to deformation, and even rupture in severe cases, which undoubtedly poses a hidden danger to the safe operation of the engine. Secondly, such exhaust pipe structure is complex and has multiple branches, and the lengths and structures of the branches 101 are often uneven, which causes the flow resistance of each branch to be different. The difference in flow resistance further causes the pressure at the outlet to be uneven, and sometimes the pressure difference is quite significant, which ultimately has a negative impact on the key indicators such as the aerodynamic performance and cooling performance of the engine.
[0004] In summary, the existing engine exhaust pipe mainly faces the following two difficulties:
[0005] First, the uneven structure stress problem is prominent. The exhaust pipe, as a special pipe, is subjected to uneven stress distribution during operation, especially at the parts where the material processing deformation is significant, and the stress is highly concentrated. When subjected to pressure, the pipe at these parts is prone to plastic deformation, and once the bearing limit is exceeded, the pipe will inevitably rupture, which seriously endangers the safe and stable operation of the engine.
[0006] Second, the branch structure causes flow resistance difference. The branch structure of the exhaust pipe causes different branches to have different flow resistances to the medium due to their different structures. This flow resistance difference is reflected in the outlet, where the pressure is different, and a large pressure difference will disturb the normal airflow and heat exchange environment inside the engine, thereby damaging the overall performance of the engine. UTILITY MODEL CONTENTS
[0007] In view of the above problems of the prior art, the utility model provides an exhaust pipeline, can overcome the problem of uneven stress, and can adjust the flow resistance generated by the medium in the pipeline.
[0008] Specifically, the utility model provides an exhaust pipeline, suitable for an aero-engine, the exhaust pipeline comprises an adjusting connecting section, the adjusting connecting section is connected into the exhaust pipeline, and is arranged at the position of maximum deformation of the exhaust pipeline;
[0009] The adjusting connecting section comprises a special-shaped pipe, a reinforcing rod and a valve piece, the reinforcing rod is fixedly penetrated on the special-shaped pipe, the length direction of the reinforcing rod is perpendicular to the length direction of the special-shaped pipe, the valve piece is arranged in the special-shaped pipe and is fixed on the reinforcing rod, and the reinforcing rod is rotated to drive the valve piece to rotate.
[0010] According to an embodiment of the utility model, the adjusting connecting section further comprises a cover plate and a first fixed nut, the cover plate is fixedly matched with the outer wall surface of the special-shaped pipe, one end of the reinforcing rod penetrates outward through the outer wall of the special-shaped pipe and the cover plate, and is fixedly matched with the first fixed nut.
[0011] According to an embodiment of the utility model, the adjusting connecting section further comprises a first sealing ring, which is arranged between the special-shaped pipe and the cover plate.
[0012] According to an embodiment of the utility model, the adjusting connecting section further comprises a fixed stopper and a second fixed nut, the fixed stopper is fixedly matched with the outer wall surface of the special-shaped pipe, the other end of the reinforcing rod penetrates outward through the outer wall of the special-shaped pipe and the fixed stopper, and is fixedly matched with the second fixed nut.
[0013] According to an embodiment of the utility model, the adjusting connecting section further comprises a second sealing ring, which is arranged between the special-shaped pipe and the fixed stopper.
[0014] According to an embodiment of the utility model, the adjusting connecting section further comprises an adjusting rod, an adjusting groove is formed in the fixed stopper, one end of the adjusting rod is fixedly matched with the other end of the reinforcing rod, the other end of the adjusting rod extends into the adjusting groove, and the other end of the adjusting rod moves in the adjusting groove to adjust the rotation angle of the reinforcing rod.
[0015] According to an embodiment of the utility model, the adjusting connecting section further comprises a locking nut, the locking nut is fixedly matched with the other end of the adjusting rod in a threaded mode, and the locking nut is used for limiting the movement of the adjusting rod along the length direction thereof.
[0016] According to one embodiment of the present application, the adjusting connecting section further comprises a screw, and the fixed block is fixed on the profiled pipe through the screw.
[0017] According to one embodiment of the present application, the adjusting groove is arc-shaped, and the central angle corresponding to the arc length of the adjusting groove is 90 degrees.
[0018] According to one embodiment of the present application, the outlet section of the exhaust pipeline is provided with a gas pressure sensor.
[0019] The exhaust pipeline provided by the present application overcomes the problem of uneven stress of the structure through the reinforcing rod and the valve plate structure of the adjusting connecting section, and can adjust the valve plate to adjust the flow resistance generated by the medium in the pipeline.
[0020] It should be understood that the above general description and the following detailed description of the present application are exemplary and illustrative, and are intended to provide further explanation of the described present application. BRIEF DESCRIPTION OF DRAWINGS
[0021] The accompanying drawings are included to provide a further understanding of the present application, and they are incorporated and constitute a part of the present application, and the drawings show embodiments of the present application, and together with the present specification, play a role of explaining the principles of the present application. In the drawings:
[0022] Figure 1 A structural schematic diagram of an exhaust pipeline of an aero-engine in the prior art is shown.
[0023] Figure 2 A structure and strength simulation schematic diagram of a ten-stage TBV exhaust pipeline of an aero-engine in the prior art is shown.
[0024] Figure 3 A structural schematic diagram of an exhaust pipeline of one embodiment of the present application is shown.
[0025] Figure 4 A structural schematic diagram of an adjusting connecting section of one embodiment of the present application is shown.
[0026] Figure 5 is Figure 4 a cross-sectional schematic diagram.
[0027] Figure 6 A structural schematic diagram of a fixed block of one embodiment of the present application is shown.
[0028] Figure 7 A structural schematic diagram of an adjusting connecting section of one embodiment of the present application is shown Figure 1 .
[0029] Figure 8 A structural schematic diagram of an adjusting connecting section of one embodiment of the present application is shownFigure 2 .
[0030] Wherein, the above figures include the following reference signs:
[0031] Exhaust pipeline 100
[0032] Branch 101
[0033] Exhaust pipeline 200
[0034] Gas pressure sensor 201
[0035] Adjusting connecting section 300
[0036] Special-shaped pipe 301
[0037] Reinforcing rod 302
[0038] Valve plate 303
[0039] Cover plate 304
[0040] First fixing nut 305
[0041] First sealing ring 306
[0042] Fixed stopper 307
[0043] Second fixing nut 308
[0044] Second sealing ring 309
[0045] Adjusting rod 310
[0046] Adjusting groove 311
[0047] Locking nut 312
[0048] Screw 313 DETAILED DESCRIPTION
[0049] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.
[0050] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.
[0051] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, devices, components and / or combinations thereof, but do not preclude the presence or addition of one or more other features, steps, operations, devices, components and / or combinations thereof.
[0052] The relative arrangement of components and steps, numerical expressions, and numerical values set forth in the examples are not intended to limit the scope of the application unless otherwise specifically stated. It is to be understood that the drawings are not necessarily to scale of the actual proportions used in the fabrication, assembly, and operation of the example embodiments. Techniques, methods, and apparatus known to those of ordinary skill can not be discussed in detail herein. However, the techniques, methods, and apparatus are to be considered as part of the description of the application, where appropriate. In all examples shown and discussed herein, any specific values are to be interpreted as being exemplary only and not as a limitation on the scope of the example embodiments. Thus, other examples of the example embodiments can have different values. It is to be noted that like reference numerals and letters refer to like items in the drawings, and, once an item is defined in one drawing, it need not be discussed further in subsequent drawings.
[0053] In the description of the present application, it is to be understood that the orientation or positional relationships indicated by orientation words such as "front, back, upper, lower, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are generally based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Without the opposite indication, these orientation words do not indicate and imply that the indicated device or element must have a particular orientation or be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the scope of protection of the present application. The orientation words "inner, outer" refer to the inner and outer relative to the contour of the components themselves.
[0054] For purposes of the description hereinafter, spatial relative terms, such as "above", "below", "upper", "lower", and the like, can be used to describe the relative position of one element or feature to another element or feature as illustrated in the figures. It will be understood that the spatial relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "up" other elements or features would then be oriented "below" or "down" the other elements or features. Thus, the exemplary term "above" can encompass both an orientation of above and below. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
[0055] In addition, it should be pointed out that the use of the terms "first", "second", and the like, to describe various elements in the claims is merely intended to distinguish between two instances of the elements and is not intended to limit the scope of the claims to implementations with such two instances. Unless otherwise indicated, the terms in the specification including the terms in the claims are to be given their broadest interpretation under the circumstances, the detailed description including the examples provided herein being provided for the purpose of interpretation and understanding of the claims.
[0056] Figure 3 A structure schematic view of the exhaust pipeline of one embodiment of the present application is shown. Figure 4 A structure schematic view of the adjusting connecting section of one embodiment of the present application is shown. Figure 5 Figure 4 A cross-sectional schematic view is shown. As shown in the figure, the present application provides an exhaust pipeline 200 applicable to an aero-engine. The exhaust pipeline 200 comprises an adjusting connecting section 300. The adjusting connecting section 300 is connected to the exhaust pipeline 200, and is arranged at the maximum deformation position of the exhaust pipeline 200. The maximum deformation position of the exhaust pipeline 200 can be obtained by a structure simulation method.
[0057] The adjusting connecting section 300 mainly comprises a profiled pipe 301, a reinforcing rod 302 and a valve plate 303. The reinforcing rod 302 penetrates the profiled pipe 301 and is fixed on the profiled pipe 301. The length direction of the reinforcing rod 302 is substantially perpendicular to the length direction of the profiled pipe 301. The reinforcing rod 302 enhances the structural strength of the profiled pipe 301 and inhibits the deformation of the pipeline. The valve plate 303 is arranged in the profiled pipe 301 and is fixed on the reinforcing rod 302. The valve plate 303 is rotated by rotating the reinforcing rod 302. The valve plate 303 is a butterfly valve plate and is in an elliptical shape, and the area of the valve plate 303 is slightly smaller than the cross-sectional area of the profiled pipe 301. By rotating the reinforcing rod 302, the valve plate 303 can be flexibly rotated. In this way, when the exhaust pipeline 200 is subjected to medium impact and pressure changes under different working conditions, the operator can easily control the reinforcing rod 302 according to actual needs, and then accurately control the opening angle of the valve plate 303, so as to realize fine management of the key parameters such as the medium flow and pressure in the exhaust pipeline 200, ensure the consistency of the outlet pressures of different branches of the exhaust pipeline 200, and ensure that the exhaust pipeline 200 always maintains an efficient and stable working state under the complex and variable operating environment of the aero-engine.
[0058] In some examples, the adjusting connecting section 300 further comprises a cover plate 304 and a first fixing nut 305. The cover plate 304 is fixed with the outer wall surface of the profiled pipe 301. One end of the reinforcing rod 302 penetrates the outer wall of the profiled pipe 301 and the cover plate 304 and is fixed with the first fixing nut 305. The cover plate 304 is used to strengthen the protection capability of the profiled pipe 301 and assist in stabilizing the connection between the reinforcing rod 302 and the profiled pipe 301. The first fixing nut 305 is tightly matched with the reinforcing rod 302 through the cover plate 304, so that the reinforcing rod 302 can still be stably fixed on the profiled pipe 301 when bearing stress, without loosening or displacement, etc. This ensures that the adjusting connecting section 300 and even the entire exhaust pipeline 200 always maintains a reliable working state under the high-strength and high-frequency operating conditions of the aero-engine.
[0059] In some examples, the adjusting connecting section 300 further comprises a first sealing ring 306. The first sealing ring 306 is arranged between the profiled pipe 301 and the cover plate 304. It should be noted that there is high-temperature, high-pressure and variable-flow medium (gas) in the exhaust pipeline 200, and the external environment has water vapor, impurities and other adverse factors. At this time, the sealing performance of the first sealing ring 306 fills the possible slight gap between the profiled pipe 301 and the cover plate 304. The first sealing ring 306 effectively blocks the invasion of water vapor, dust and other impurities from the outside into the exhaust pipeline 200, and at the same time, prevents the internal medium from leaking, so as to ensure that the medium can be efficiently transmitted along the predetermined path and maintain the aerodynamic stability of the engine.
[0060] In some examples, the adjusting connecting section 300 further comprises a fixed block 307 and a second fixed nut 308. The fixed block 307 is fixed in cooperation with the outer wall surface of the profiled pipe 301, the other end of the reinforcing rod 302 penetrates outwardly through the outer wall of the profiled pipe 301 and the fixed block 307, and is fixed in cooperation with the second fixed nut 308. The fixed block 307 cooperates with the second fixed nut 308 to provide powerful support for the reinforcing rod 302, forms structural echo with the previous cover plate 304 and the first fixed nut 305, and keeps the reinforcing rod 302 stable in the length direction, thereby improving the structural strength of the adjusting connecting section 300.
[0061] In some examples, the adjusting connecting section 300 further comprises a second sealing ring 309. The second sealing ring 309 is arranged between the profiled pipe 301 and the fixed block 307. Similar to the first sealing ring 306, the second sealing ring 309 is used to fill the possible slight gap between the profiled pipe 301 and the fixed block 307. The second sealing ring 309 effectively prevents the water vapor, dust and other impurities in the outside from invading the inside of the exhaust pipeline 200, and at the same time, prevents the internal medium from leaking, and ensures that the medium can be efficiently transmitted along the predetermined path.
[0062] Figure 6 A structural schematic view of the fixed block of one embodiment of the utility model is shown. Figure 7 A structural schematic view of the adjusting connecting section of one embodiment of the utility model is shown Figure 1 . Figure 8 A structural schematic view of the adjusting connecting section 300 of one embodiment of the utility model is shown Figure 2As shown in the figure, in some examples, the adjusting connecting section 300 further comprises an adjusting rod 310. An adjusting groove 311 is formed on the fixed block 307. One end of the adjusting rod 310 is fixedly connected with the other end of the reinforcing rod 302. The other end of the adjusting rod 310 extends into the adjusting groove 311. The adjusting groove 311 is used to limit the movement path of the adjusting rod 310, and the other end of the adjusting rod 310 moves in the adjusting groove 311 to adjust the rotation angle of the reinforcing rod 302. When the aero-engine is in different working conditions and has different requirements for the medium and pressure in the exhaust pipeline 200, the operator can control the adjusting rod 310 to move flexibly in the adjusting groove 311. Since the adjusting rod 310 is connected with the reinforcing rod 302, the movement of the adjusting rod 310 can adjust the rotation angle of the reinforcing rod 302. With the change of the angle of the reinforcing rod 302, the valve plate 303 fixed thereon also rotates synchronously, thereby realizing fine adjustment and control of the key parameters such as the medium flow, flow rate and pressure in the exhaust pipeline 200. It should be noted that before the adjusting rod 310 is controlled, the first fixing nut 305 and the second fixing nut 308 are loosened to enable the reinforcing rod 302 to rotate freely; after the angle of the valve plate 303 is adjusted, the first fixing nut 305 and the second fixing nut 308 are tightened to fix the reinforcing rod 302 on the profiled pipe 301. This design is like installing an adjusting valve on the exhaust pipeline 200, which can ensure that the exhaust pipeline 200 always maintains the best working state.
[0063] In some examples, the adjusting connecting section 300 further comprises a locking nut 312. The locking nut 312 is fixedly connected with the other end of the adjusting rod 310 in a threaded manner, and is used to limit the movement of the adjusting rod 310 along the length direction thereof. During the continuous operation of the aero-engine, various interference factors such as air flow impact and body vibration are inevitably encountered, which are extremely likely to cause unintended displacement of the adjusting rod 310. The locking nut 312 cooperates with the adjusting groove 311 to limit any movement of the adjusting rod 310 along the length direction thereof, so as to keep the adjusting rod 310 in a predetermined position.
[0064] In some examples, the adjusting connecting section 300 further comprises a screw 313. Referring to Figure 3 In this embodiment, the adjusting connecting section 300 further comprises three screws 313, and the fixed block 307 is stably fixed on the profiled pipe 301 through the three screws 313 arranged in the circumferential direction.
[0065] In some examples, the adjusting groove 311 is arc-shaped. The central angle corresponding to its arc length is 90 degrees. When the operator adjusts the rotation angle of the reinforcing rod 302 according to different engine operating conditions, the adjusting rod 310 can move flexibly within the arc length corresponding to this 90-degree central angle, achieving precise control of the rotation angle of the reinforcing rod 302, and thus accurately adjusting the angle of the valve plate 303 to meet the strict requirements for parameters such as the flow rate and pressure of the medium in the exhaust pipe 200 under different operating conditions.
[0066] Figure 7 A schematic diagram of the structure of the adjusting connecting section 300 according to an embodiment of the present invention is shown. Figure 1 . Figure 8 A schematic diagram of the structure of the adjusting connecting section 300 according to an embodiment of the present invention is shown. Figure 2 As shown in the figure, the other end of the adjusting rod 310 is located at different positions in the adjusting groove 311 in the two figures. This change in position directly reflects the different opening and closing angles of the valve plate 303. The operator can flexibly adjust the position of the adjusting rod 310 in the adjusting groove 311 according to the real-time operating conditions of the engine. As the position of the adjusting rod 310 changes, the rotation angle of the reinforcing rod 302, which is closely connected to it, will also change accordingly, thereby driving the valve plate 303 fixed on the reinforcing rod 302 to change its opening and closing angle. Through this adjustment method, the airflow conditions in the exhaust pipe 200 can be effectively controlled to meet the strict requirements of the engine for parameters such as medium flow rate and pressure under different operating conditions. For example, during the engine start-up or acceleration phase, a larger exhaust volume is required. At this time, the adjusting rod 310 can be adjusted to... Figure 8 At a specific position, the valve plate 303 is opened at a larger angle to ensure sufficient medium is discharged smoothly; while when the engine is running smoothly, the adjusting rod 310 is adjusted appropriately to... Figure 7 Positioning the valve plate 303 reduces its opening and closing angle, optimizes the medium flow state, and improves the overall performance and stability of the engine. Those skilled in the art will know that, for different operating conditions of the regulating valve plate 303, experiments can be conducted to obtain different medium pressures and the relationship between the valve plate 303 angle and flow resistance loss, as shown in Table 1 below. This establishes a functional relationship between the valve plate 303 rotation angle and the pressure within the pipeline, thus enabling precise adjustment of the outlet pressure.
[0067] Table 1 Pressure Loss under Different Operating Conditions
[0068]
[0069] In some examples, turn back to Figure 3A gas pressure sensor 201 is arranged at the outlet section of the exhaust pipeline 200. The gas pressure sensor 201 is used to monitor the pressure of the gas at the outlet of the exhaust pipeline 200 in real time and accurately. Through the pressure data collected by the gas pressure sensor 201, intelligent regulation and control of the exhaust pipeline 200 system can be realized. For example, in linkage with the valve piece 303 adjusting device of the adjusting connecting section 300, when it is detected that the outlet pressure is too high, the adjusting mechanism is automatically triggered, the opening and closing angle of the valve piece 303 is finely adjusted, the exhaust flow is optimized, and it is ensured that the exhaust pipeline 200 and even the entire aero-engine is always maintained in an efficient and stable operating state.
[0070] It is obvious to those skilled in the art that various modifications and variations can be made to the above exemplary embodiments of the present application without departing from the spirit and scope of the present application. Therefore, it is intended to cover modifications and variations of the present application falling within the scope of the appended claims and their equivalents.
Claims
1. An exhaust pipe, suitable for an aircraft engine, characterized in that, The exhaust pipe includes an adjustable connecting section, which is connected to the exhaust pipe and located at the position where the exhaust pipe is most deformed. The adjusting connecting section includes a special-shaped tube, a reinforcing rod, and a valve plate. The reinforcing rod is fixed through the special-shaped tube, and the length direction of the reinforcing rod is perpendicular to the length direction of the special-shaped tube. The valve plate is disposed inside the special-shaped tube and fixed on the reinforcing rod. Rotating the reinforcing rod causes the valve plate to rotate.
2. The exhaust pipe as described in claim 1, characterized in that, The adjusting connecting section also includes a cover plate and a first fixing nut. The cover plate is fixed to the outer wall surface of the shaped tube. One end of the reinforcing rod passes outward through the outer wall of the shaped tube and the cover plate, and is fixed to the first fixing nut.
3. The exhaust pipe as described in claim 2, characterized in that, The adjusting connection section also includes a first sealing ring, which is disposed between the shaped tube and the cover plate.
4. The exhaust pipe as described in claim 1, characterized in that, The adjusting connecting section also includes a fixing block and a second fixing nut. The fixing block is fixed to the outer wall surface of the shaped tube. The other end of the reinforcing rod passes outward through the outer wall of the shaped tube and the fixing block, and is fixed to the second fixing nut.
5. The exhaust pipe as described in claim 4, characterized in that, The adjusting connection section also includes a second sealing ring, which is disposed between the shaped tube and the fixed stop.
6. The exhaust pipe as described in claim 4, characterized in that, The adjusting connecting section also includes an adjusting rod, and an adjusting groove is provided on the fixed stop. One end of the adjusting rod is fixed to the other end of the reinforcing rod, and the other end of the adjusting rod extends into the adjusting groove. The other end of the adjusting rod moves within the adjusting groove to adjust the rotation angle of the reinforcing rod.
7. The exhaust pipe as described in claim 6, characterized in that, The adjusting connection section also includes a locking nut, which is threadedly engaged with the other end of the adjusting rod for fixation. The locking nut is used to restrict the movement of the adjusting rod along its length.
8. The exhaust pipe as described in claim 4, characterized in that, The adjusting connecting section also includes screws, and the fixing block is fixed to the shaped tube by the screws.
9. The exhaust pipe as described in claim 6, characterized in that, The adjustment groove is arc-shaped, and the central angle corresponding to its arc length is 90 degrees.
10. The exhaust pipe as described in claim 1, characterized in that, A gas pressure sensor is installed at the outlet section of the exhaust pipe.