Backpressure adjusting device of core machine
By setting up a pressure regulating device and a rectifier device on the exhaust pipe of the core machine, the complex structure and inconvenient operation in the existing technology are solved, and the exhaust stability and safety are improved, ensuring the back pressure of the core machine Safety of adjustment devices and tests.
Patent Information
- Application Number
- CN202310738751.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-06-20
- Publication Date
- 2024-12-20
AI Technical Summary
The existing core machine backpressure adjustment device has complex structure and inconvenient operation, and the exhaust gas is unbalanced or unstable, resulting in vibration and additional loads, affecting performance.
A back pressure adjustment device including an intake pipe, an exhaust pipe and a rectifier device is designed. The exhaust gas flow area is adjusted by setting a pressure regulating device on the exhaust pipe and a rectifier device is provided at the exhaust end to prevent air flow. Imbalance and deflection to improve safety.
It realizes a simple structure and easy operation back pressure adjustment, prevents the exhaust air flow from being unbalanced and deflected, and improves the safety and test safety of the back pressure adjustment device and the core machine.
Smart Images
Figure CN119163521A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a back pressure regulating device of a core engine. Background Art
[0002] During the development phase of the core engine, the core engine high-pressure turbine outlet pressure is usually adjusted to study the performance of the core engine under different outlet back pressures. The core engine high-pressure turbine outlet pressure is achieved by changing the core engine outlet flow area. In China, this is generally achieved by replacing the fixed nozzle or using an adjustable nozzle. However, there are certain defects in the methods of replacing the fixed nozzle or using an adjustable nozzle:
[0003] The outlet area (diameter) of the fixed nozzle is fixed, and its area cannot be changed during the operation of the core engine. To study the performance of the core engine under different nozzle areas, it is necessary to remove the fixed nozzle and replace it with nozzles of other outlet areas. Since the fixed nozzle of the core engine is large in size and the installation and disassembly space of the test bench is limited, the installation and disassembly are relatively complicated. Each replacement of the fixed nozzle is time-consuming and labor-intensive. Using multiple sets of fixed nozzles is also very likely to cause waste;
[0004] The adjustable nozzle can control the nozzle outlet area by controlling the actuator cylinder and its connecting rod assembly, and adjust the pressure of the high-pressure turbine outlet in real time online, so as to achieve the purpose of non-stop testing and studying the performance of the core engine under different nozzle areas. However, the adjustable nozzle has a complex structure and requires the test bench to be equipped with complex hydraulic actuating components. Due to the complex structure of the adjustable nozzle, its manufacturing cost is extremely high.
[0005] Moreover, in the existing pressure regulation method, the regulated exhaust gas is directly discharged, the exhaust gas flow is unbalanced or unstable, or the exhaust direction is easily deflected, which may cause vibration or additional load, and affect the performance of the back pressure regulation device or the core engine. Summary of the invention
[0006] The technical problem to be solved by the present invention is to provide a core engine back pressure regulating device in order to overcome the defects of complex structure and / or inconvenient operation when regulating the core engine back pressure in the prior art.
[0007] The present invention solves the above technical problems through the following technical solutions:
[0008] The present invention provides a back pressure regulating device for a core engine, comprising an intake pipeline, an exhaust pipeline and a rectifying device, wherein the intake pipeline is used to receive exhaust gas from the core engine, the exhaust pipeline is used to discharge the exhaust gas entering the intake pipeline, and a pressure regulating device is arranged on the exhaust pipeline, and the pressure regulating device regulates the exhaust flow area of the exhaust pipeline; the rectifying device is connected to the exhaust end of the exhaust pipeline, and is used to rectify the exhaust gas at the exhaust end.
[0009] In the present scheme, a core engine back pressure regulating device is provided, in which a pressure regulating device is arranged on the exhaust pipeline, and the exhaust pressure of the exhaust pipeline is adjusted by adjusting the exhaust flow area of the exhaust pipeline by the pressure regulating device. The structure is simple and the operation is convenient. In addition, a rectifying device is arranged at the exhaust end of the exhaust pipeline to rectify the exhaust of the exhaust pipeline to prevent the exhaust airflow from being unbalanced or unstable or the exhaust direction from being easily deflected to cause vibration or additional load, thereby improving the safety of the back pressure regulating device and the core engine and ensuring the safety of the test.
[0010] Preferably, the rectifier device comprises a shell and a plurality of rectifier tubes, wherein the plurality of rectifier tubes are arranged in parallel in the shell so that the exhaust gas at the exhaust end flows out horizontally and evenly through the plurality of rectifier tubes.
[0011] In this solution, a plurality of rectifier tubes are arranged in parallel in the shell of the rectifier device so that the exhaust gas at the exhaust end can flow out horizontally and evenly through the plurality of rectifier tubes, thereby ensuring the airflow injection effect at the core engine outlet and avoiding additional loads and moments caused by airflow deflection.
[0012] Preferably, the shell has an expansion section and a cylindrical section, the expansion section has a first end and a second end, the caliber of the first end is smaller than the caliber of the second end, the first end is connected to the exhaust end of the exhaust pipe, the second end is connected to the cylindrical section, and a plurality of the rectifier tubes are located in the cylindrical section.
[0013] In the present embodiment, the shell of the rectifier device has an expansion section and a cylindrical section. The exhaust gas of the exhaust pipe passes through the expansion section and the cylindrical section in sequence. The expansion section is gradually expanding, and the expansion section decelerates the exhaust gas. The decelerated exhaust gas passes through several rectifier flow tubes entering the cylindrical section and is discharged. The caliber of the first end is smaller than the caliber of the second end. After passing through the expansion section, the caliber becomes larger, and space is provided for the installation of several rectifier tubes.
[0014] Preferably, the rectifying device also includes a rectifying baffle, which is located at one end where the cylindrical section is connected to the expansion section or the second end of the expansion section, and a plurality of clearance holes are opened on the rectifying baffle, and a plurality of the rectifying tubes are respectively placed in the plurality of clearance holes.
[0015] In the present scheme, a rectifying baffle with a clearance hole is provided so that the airflow in the expansion section enters the rectifying tube through the clearance hole, thereby facilitating the rectification of the exhaust airflow. Furthermore, placing a plurality of rectifying tubes in a plurality of the clearance holes respectively can support the plurality of rectifying tubes, thereby making the rectifying device more stable.
[0016] Preferably, the exhaust pipeline includes a main pipeline and a bypass pipeline, the main pipeline and the bypass pipeline are respectively connected to the outlet end of the intake pipeline, the pressure regulating device is arranged on the main pipeline, and the rectifying device is connected to the outlet end of the main pipeline.
[0017] In this scheme, part of the exhaust gas of the core engine is discharged through the bypass pipeline to ensure the safe operation of the core engine, and the other part is discharged through the main pipeline, and a pressure regulating device is arranged on the main pipeline. By adjusting the exhaust gas of the main pipeline, the exhaust pressure of the core engine is adjusted, and the rectifying device can rectify the exhaust gas of the main pipeline to improve the safety and reliability of the entire exhaust device.
[0018] Preferably, the bypass pipeline is further provided with a nozzle, and the nozzle is detachably connected to the outlet end of the bypass pipeline.
[0019] In this solution, the nozzle is detachably connected to the outlet end of the bypass pipe. The detachable connection of the nozzle facilitates the replacement of nozzles with different outlet cross-sections, thereby being able to test different types of core engines or meet different test conditions of the core engine.
[0020] Preferably, the nozzle is convergent along the direction of gas discharge.
[0021] In this scheme, the nozzle converges along the direction of gas discharge to gather the airflow, prevent gas diffusion from generating additional torque, and reduce the impact on the core engine test performance.
[0022] Preferably, the main pipeline is connected to the intake pipeline, there are a plurality of bypass pipelines, and the plurality of exhaust pipelines are evenly arranged along the circumference of the intake pipeline.
[0023] In this solution, a plurality of bypass pipes are evenly arranged along the circumference of the exhaust main pipe, which can reduce vibration caused by unbalanced airflow.
[0024] Preferably, the pressure regulating device includes a valve assembly, which includes a valve plate, a valve shaft, a controller and an indicator. The valve shaft is connected to the valve plate, and the controller controls the rotation of the valve shaft to drive the valve plate to rotate circumferentially, and displays the opening of the valve plate through the indicator.
[0025] In this solution, the controller controls the rotation of the valve shaft to drive the valve plate to rotate circumferentially to adjust the opening of the valve plate. The indicator can intuitively reflect the real-time opening of the valve in the main pipeline. By connecting the controller to the valve shaft, the valve can be automatically adjusted as needed.
[0026] Preferably, the core engine back pressure regulating device further comprises a transition pipe section, and both ends of the transition pipe section are detachably connected between the air intake pipeline and the core engine.
[0027] In this solution, a transition pipe section is used to connect the core engine and the air intake pipeline, and the exhaust of the core engine is sent to the air intake pipe section. The transition pipe section is detachably connected between the interface of the core engine and the air intake pipeline, which facilitates the disassembly of the transition pipe section and the replacement of the transition pipe section according to different core engine models, thereby being suitable for core engines of different models.
[0028] Preferably, the core engine back pressure regulating device is also provided with a connecting piece for lifting, and there are at least two connecting pieces, and at least two of the connecting pieces are respectively arranged on the outer side wall of the back pressure regulating device at intervals along the axial direction of the intake pipe.
[0029] In this scheme, the core engine back pressure regulating device is connected to the lifting device through a connecting piece, and the lifting device is moved to dock with the core engine outlet mounting edge, thereby realizing the connection between the core engine back pressure regulating device and the core engine. In this process, gravity can be avoided from acting on the core engine mounting edge.
[0030] The positive progressive effect of the present invention is that it provides a core engine back pressure regulating device, in which a pressure regulating device is arranged on the exhaust pipeline, and the exhaust pressure of the exhaust pipeline is adjusted by adjusting the exhaust flow area of the exhaust pipeline by the pressure regulating device. The structure is simple and the operation is convenient. In addition, a rectifying device is arranged at the exhaust end of the exhaust pipeline to rectify the exhaust of the exhaust pipeline to prevent the exhaust airflow from being unbalanced or unstable or the exhaust direction from being easily deflected to cause vibration or additional load, thereby improving the safety of the back pressure regulating device and the core engine and ensuring the safety of the test. BRIEF DESCRIPTION OF THE DRAWINGS
[0031] Figure 1 A back pressure regulating device for a core engine according to an embodiment of the present invention.
[0032] Figure 2 for Figure 1 Schematic diagram of the structure of the back pressure regulating device of the core engine connected to the core engine.
[0033] Figure 3 Structural side view of the main exhaust section.
[0034] Figure 4 This is the front view of the adjustment mechanism.
[0035] Figure 5 This is an axonometric view of the rectifier.
[0036] Figure 6 This is a front view of the rectifier.
[0037] Description of Reference Numerals
[0038] Intake pipe 1
[0039] Exhaust pipe 2
[0040] Pressure regulating device 3
[0041] Valve plate 31
[0042] Valve shaft 32
[0043] Controller 33
[0044] Indicator 34
[0045] Rectification device 4
[0046] Housing 41
[0047] Rectifier 42
[0048] Rectification baffle 43
[0049] Make way hole 431
[0050] Expansion section 44
[0051] Cylindrical segment 45
[0052] Bypass line 21
[0053] Nozzle 211
[0054] Main Road 22
[0055] Transition pipe section 5
[0056] Connector 6
[0057] Core Engine 7 DETAILED DESCRIPTION
[0058] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.
[0059] The present invention provides a back pressure regulating device for a core engine, such as Figure 1-Figure 2 As shown, it includes an intake pipeline 1 and an exhaust pipeline 2. The intake pipeline 1 is used to receive exhaust gas from the core engine 7, and the exhaust pipeline 2 is used to discharge the exhaust gas entering the intake pipeline 1. The exhaust pipeline 2 is provided with a pressure regulating device 3, which adjusts the exhaust flow area of the exhaust pipeline 2. It also includes a rectifying device 4, which is connected to the exhaust end of the exhaust pipeline 2 and is used to rectify the exhaust gas at the exhaust end. The pressure regulating device 3 is provided on the exhaust pipeline 2, and the exhaust pressure of the exhaust pipeline 2 is adjusted by adjusting the exhaust flow area of the exhaust pipeline 2 by the pressure regulating device 3. The structure is simple and the operation is convenient. In addition, the rectifying device 4 is provided at the exhaust end of the exhaust pipeline 2 to rectify the exhaust gas of the exhaust pipeline 2, so as to prevent the exhaust gas flow from being unbalanced or unstable or the exhaust direction from being easily deflected to cause vibration or additional load, thereby improving the safety of the back pressure regulating device and the core engine 7 and ensuring the safety of the test.
[0060] like Figure 5-Figure 6 The rectifier 4 includes a housing 41 and a plurality of rectifier tubes 42. The plurality of rectifier tubes 42 are arranged in parallel in the housing 41 so that the exhaust gas at the exhaust end flows out horizontally through the plurality of rectifier tubes 42. The housing 41 of the rectifier 4 includes a plurality of rectifier tubes 42 arranged in parallel so that the exhaust gas at the exhaust end flows out horizontally through the plurality of rectifier tubes 42. The plurality of rectifier tubes are arranged in an array, thereby ensuring the airflow ejection effect at the outlet of the core engine 7 and avoiding the additional load and moment caused by the airflow deflection.
[0061] like Figure 5 As shown, the housing 41 has an expansion section 44 and a cylindrical section 45. The expansion section 44 has a first end and a second end. The caliber of the first end is smaller than the caliber of the second end. The first end is connected to the exhaust end of the exhaust pipe 2, and the second end is connected to the cylindrical section 45. A plurality of rectifier tubes 42 are located in the cylindrical section 45. The housing 41 of the rectifier 4 is configured to have an expansion section 44 and a cylindrical section 45. The exhaust gas of the exhaust pipe 2 passes through the expansion section 44 and the cylindrical section 45 in sequence. The expansion section 44 is gradually expanded. The expansion section 44 decelerates the exhaust gas. The decelerated exhaust gas passes through a plurality of rectifier tubes in the cylindrical section 45 and is discharged. Moreover, the caliber of the first end is smaller than the caliber of the second end. After passing through the expansion section 44, the caliber becomes larger, and space is provided for the installation of a plurality of rectifier tubes 42.
[0062] like Figure 6 As shown, the rectifying device 4 further includes a rectifying baffle 43, which is located in the housing 41. For example, the rectifying baffle 43 is located at one end where the cylindrical section 45 and the expansion section 44 are connected. A plurality of clearance holes 431 are provided on the rectifying baffle 43, and a plurality of rectifying tubes 42 are respectively placed in the plurality of clearance holes 431 to support the plurality of rectifying tubes 42, and the airflow of the expansion section 44 is discharged only from the rectifying tube 42. By providing the rectifying baffle 43 with the clearance holes 431, the airflow of the expansion section 44 enters the rectifying tube 42 through the clearance holes 431, so as to facilitate the rectification of the exhaust airflow, and placing the plurality of rectifying tubes 42 in the plurality of clearance holes 431 respectively can support the plurality of rectifying tubes 42, so as to make the rectifying device 4 more stable. Of course, in other embodiments, the rectifying baffle 43 may also be located at the second end of the expansion section 44 , as long as the airflow of the expansion section 44 can enter the rectifying tube 42 through the clearance hole 431 on the rectifying baffle 43 .
[0063] like Figure 1-Figure 2As shown, the exhaust pipeline 2 includes a main pipeline 22 and a bypass pipeline 21, the main pipeline 22 and the bypass pipeline 21 are respectively connected to the outlet end of the intake pipeline 1, the pressure regulating device 3 is arranged on the main pipeline 22, and the rectifying device 4 is connected to the outlet end of the main pipeline 22. A part of the exhaust gas of the core engine 7 is discharged through the bypass pipeline 21, and the exhaust section of the bypass pipeline 21 is in a normally open state to ensure the safe operation of the core engine 7, and the other part is discharged through the main pipeline 22, and the pressure regulating device 3 is arranged on the main pipeline 22, and the exhaust gas of the main pipeline 22 is adjusted to adjust the exhaust gas pressure of the core engine 7, and the rectifying device 4 can rectify the exhaust gas of the main pipeline 22, thereby improving the safety and reliability of the entire exhaust device.
[0064] Figure 1-Figure 2 It is shown that a nozzle 211 is provided on the bypass pipeline, and the nozzle 211 is detachably connected to the outlet end of the bypass pipeline. And the nozzle 211 is convergent along the direction of gas discharge. The nozzle 211 is detachably connected to the outlet end of the bypass pipeline. Through the detachable connection of the nozzle 211, it is convenient to replace the nozzle 211 with different outlet cross-sections, so as to meet the test of different types of core engines 7, or meet the different test states of the core engine 7. For example, when a small-displacement core engine 7 is tested or the bypass pipeline 21 is required to have a small displacement, the nozzle 211 with a smaller outlet diameter is replaced. And the nozzle 211 is convergent along the direction of gas discharge, which gathers the airflow, prevents the gas from diffusing and generating additional torque, and reduces the impact on the test performance of the core engine 7.
[0065] Figure 1-Figure 2 As shown, the main pipe 22 is connected to the intake pipe 1, and there are two bypass pipes 21. The two bypass pipes 21 are symmetrically arranged around the intake pipe 1, that is, evenly arranged around the exhaust main pipe, which can reduce vibration caused by unbalanced airflow. Figure 1-2 Only the bypass pipeline 21 is shown in the figure. Of course, in other embodiments, the bypass pipeline 21 may be one, three or more. However, the airflow is more stable when more than two bypass pipelines 21 are evenly arranged along the circumference of the main pipeline. As a preferred solution, the bypass pipelines 21 have the same size, and the nozzles 211 connected to the bypass pipelines 21 have the same cross-section.
[0066] like Figure 3-4As shown, the pressure regulating device 3 includes a valve assembly, which includes a valve plate 31, a valve shaft 32, a controller 33, and an indicator 34. The valve shaft 32 is connected to the valve plate 31. The controller 33 controls the rotation of the valve shaft 32 to drive the valve plate 31 to rotate circumferentially, thereby adjusting the opening of the valve plate 31. The indicator 34 displays the opening of the valve plate 31. When conducting a test, the controller 33 receives a signal that needs to be adjusted, and the controller 33 controls the rotation of the valve shaft 32 to drive the valve plate 31 to rotate circumferentially to adjust the opening of the valve plate 31. The indicator 34 can intuitively reflect the real-time opening of the valve in the exhaust main pipeline. The controller 33 is connected to the valve shaft 32, and the automatic adjustment of the valve can be realized as needed. The valve plate 31 rotates circumferentially, and the angle of the valve plate relative to the axis of the main pipeline changes. The airflow passing through the valve plate will be deflected, and the airflow passing through the pressure regulating device will be unbalanced or deflected. The rectifying device is connected to the main pipeline where the pressure regulating device is located to rectify the airflow after passing through the pressure regulating device, so as to avoid additional loads and torques caused by the exhaust airflow sway acting on the core engine.
[0067] like Figure 1-Figure 2 As shown, the back pressure regulating device of the core engine 7 also includes a transition pipe section 5, and both ends of the transition pipe section 5 are detachably connected between the air intake pipeline 1 and the core engine 7. The core engine 7 is connected to the air intake pipeline 1 by the transition pipe section 5, and the exhaust gas of the core engine 7 is sent to the air intake pipeline. The transition pipe section 5 is detachably connected between the interface of the core engine 7 and the air intake pipeline 1, which is convenient for disassembly of the transition pipe section 5 and convenient for replacement of the transition pipe section 5 according to different models of the core engine 7, so as to be suitable for different models of core engines 7. The transition pipe section 5, the air intake pipeline 1, and the main pipeline 22 are connected in sequence, and the components are connected by flanges.
[0068] like Figure 1-Figure 3 As shown, the back pressure regulating device of the core engine 7 is also provided with a connecting piece 6 for lifting. In the present embodiment, there are two connecting pieces 6, which are arranged on the main pipeline 22 at intervals along the axial direction of the air intake pipeline, and are connected to the lifting device through the connecting piece 6. By moving the lifting device, the back pressure regulating device of the core engine 7 is docked with the core engine 7 outlet mounting edge, so that the back pressure regulating device of the core engine 7 and the core engine 7 are connected. In this process, the gravity acting on the mounting edge of the core engine 7 can be avoided. Of course, in other embodiments, the connecting piece 6 can be provided in plurality, and the plurality of connecting pieces 6 are respectively arranged on the outer side wall of the back pressure regulating device at intervals along the axial direction of the main pipeline 22. For example, the connecting piece 6 can be provided in one or more of the main pipeline 22, the air intake pipeline 1 and the transition pipe section 5.
[0069] When the back pressure regulating device of the present invention is used to regulate the back pressure of the core engine 7, a transition pipe section 5 with different interface sizes is selected according to the size of the exhaust port of the core engine 7, and the back pressure regulating device is connected to the exhaust port section of the core engine 7. The intake pipeline 1 receives the exhaust of the core engine 7, and a part of the exhaust gas entering the intake pipeline 1 is discharged through the bypass pipeline 21. The area of the nozzle 211 of the bypass pipeline 21 determines the air flow fluid area A1 of the bypass pipeline 21. The other part is discharged through the main pipeline 22. The pressure regulating device 3 on the main pipeline 22 The airflow fluid area A2 of the main line 22 is adjusted. The sum of the airflow flow area A1 of the bypass line 21 and the airflow fluid area A2 of the main line 22 is the exhaust airflow flow area A0 of the core engine 7. The controller 33 adjusts the opening of the valve plate 31 within the range from fully closed to closed and open. When the valve plate 31 is fully closed, the opening of the valve plate 31 is 0, and the airflow flow area of the main line 22 is 0; when the valve plate 31 is fully opened, the opening of the valve plate 31 is 100, and the maximum airflow flow area of the main line 22 is A2. max , that is, the air flow area A2 of the main pipeline 22 ranges from 0 to A2 max , and the exhaust airflow flow area A0 of the core engine 7 outlet ranges from A1 to A1+A2 max The controller 33 adjusts the opening of the valve plate 31, thereby adjusting the airflow flow area of the main pipeline 22, adjusting the different exhaust airflow flow areas of the core engine 7, thereby adjusting the back pressure of the core engine 7, so as to perform performance tests on the core engine 7 under different working conditions.
[0070] When the back pressure regulating device is applied to different core engines 7 , the nozzles 211 with different outlet cross-sections can be replaced, and the outlet flow area regulation range of different core engines 7 can be met by changing the nozzles 211 .
[0071] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.
Claims
1. A back pressure regulating device for a core engine, characterized in that: include: An intake pipeline (1), an exhaust pipeline (2) and a rectifying device (4), wherein the intake pipeline (1) is used to receive exhaust gas from the core engine (7), the exhaust pipeline (2) is used to discharge the exhaust gas entering the intake pipeline (1), the exhaust pipeline (2) is provided with a pressure regulating device (3), and the pressure regulating device (3) regulates the exhaust gas flow area of the exhaust pipeline (2); the rectifying device (4) is connected to the exhaust end of the exhaust pipeline (2) and is used to rectify the exhaust gas at the exhaust end.
2. The back pressure regulating device according to claim 1, characterized in that: The rectifying device (4) comprises a shell (41) and a plurality of rectifying tubes (42), wherein the plurality of rectifying tubes (42) are arranged in parallel in the shell (41) so that the exhaust gas at the exhaust end flows out horizontally through the plurality of rectifying tubes (42).
3. The back pressure regulating device according to claim 2, characterized in that: The shell (41) comprises an expansion section (44) and a cylindrical section (45); the expansion section (44) comprises a first end and a second end; the caliber of the first end is smaller than the caliber of the second end; the first end is connected to the exhaust end of the exhaust pipeline (2); the second end is connected to the cylindrical section (45); and a plurality of the rectifier tubes (42) are located in the cylindrical section (45).
4. The back pressure regulating device according to claim 3, characterized in that: The rectifying device (4) further comprises a rectifying baffle (43), wherein the rectifying baffle (43) is located at one end where the cylindrical section (45) is connected to the expansion section (44) or at the second end of the expansion section (44), and the rectifying baffle (43) is provided with a plurality of clearance holes (431), and the plurality of rectifying tubes (42) are respectively placed in the plurality of clearance holes (431).
5. The back pressure regulating device according to claim 1, characterized in that: The exhaust pipeline (2) comprises a main pipeline (22) and a bypass pipeline (21), the main pipeline (22) and the bypass pipeline (21) are respectively connected to the outlet end of the intake pipeline (1), the pressure regulating device (3) is arranged on the main pipeline (22), and the rectifying device (4) is connected to the outlet end of the main pipeline (22).
6. The back pressure regulating device according to claim 5, characterized in that: The bypass pipeline (21) is also provided with a nozzle (211), and the nozzle (211) is detachably connected to the outlet end of the bypass pipeline (21).
7. The back pressure regulating device according to claim 6, characterized in that: The nozzle (211) is convergent along the direction in which the gas is discharged.
8. The back pressure regulating device according to claim 5, characterized in that: The main pipeline (22) is connected to the intake pipeline (1), there are a plurality of bypass pipelines (21), and a plurality of exhaust pipelines (2) are evenly arranged along the circumference of the intake pipeline (1).
9. The back pressure regulating device according to claim 1, characterized in that: The pressure regulating device (3) comprises a valve assembly, which comprises a valve plate (31), a valve shaft (32), a controller (33) and an indicator (34). The valve shaft (32) is connected to the valve plate (31). The controller (33) controls the rotation of the valve shaft (32) to drive the valve plate (31) to rotate circumferentially, and displays the opening of the valve plate (31) through the indicator (34).
10. The back pressure regulating device according to claim 1, characterized in that: The back pressure regulating device further comprises a transition pipe section (5), and both ends of the transition pipe section (5) are respectively detachably connected between the air intake pipeline (1) and the core engine (7).
11. The back pressure regulating device according to claim 10, characterized in that: The back pressure regulating device is also provided with a connecting piece (6) for hoisting, and there are at least two connecting pieces (6). The at least two connecting pieces (6) are respectively arranged on the outer side wall of the back pressure regulating device at intervals along the axial direction of the air intake pipeline (1).