A device and method for synchronous or asynchronous regulation of the internal and external mode conversion of a nozzle

Abstract

The application discloses a device and method for synchronous or asynchronous regulation of mode conversion of an inner and outer channel of a nozzle, comprising a shell, an adjustable front-side air inlet valve, a crank driving unit, a rack and pinion transmission pair, a rear-side inner channel control mechanism, a flow channel support, a center body, a support and a control unit; the device adopts an integrated design of the adjustable front-side air inlet valve and the rack, and a driven conical wheel alternator of a blade disc driving ring, the rack and a slide rail can be assembled in a positive or reverse manner to realize synchronous / asynchronous switching of the inner and outer channels, the support is aerodynamically designed and the nozzle has an integrated cylindrical shape, a rear-side annular wall plate can be opened and is provided with a multi-position sealing structure, and a gas pressure detection device and a piezoelectric detection component cooperate with the control unit to form a closed-loop control link. The method realizes mode conversion based on the device. The application realizes precise switching of multiple modes, has high linkage precision, strong anti-interference capability, reliable sealing and convenient maintenance, is suitable for take-off, cruise and other working conditions, and can be widely applied to the fields of aerospace and industrial power equipment.

Description

Technical Field

[0001] This invention belongs to the field of adjustable nozzle mode conversion technology, specifically relating to a device and method for synchronously or asynchronously adjusting the mode conversion of the inner and outer bypass of a nozzle. Background Technology

[0002] With the development of aerospace technology, aircraft have placed higher demands on the adaptability of nozzle systems to different operating conditions. Nozzles need to switch working modes according to different operating conditions such as takeoff, cruise, and climb to achieve comprehensive optimization of thrust efficiency, noise control, and aerodynamic performance. At the same time, the fluid channels of industrial power equipment also need flexible mode adjustment capabilities to adapt to different workloads.

[0003] Current multimodal nozzles and fluid channel switching devices generally suffer from several technical defects: First, the mode switching between the inner and outer bypass ducts is mostly handled by two independent subsystems, lacking an effective mechanical coupling mechanism, resulting in poor coordination and an inability to achieve high-precision synchronous / asynchronous opening and closing control. This makes it difficult to balance response speed and control accuracy under dynamic operating conditions. Second, due to structural and driving limitations, existing devices only support binary switching of bypass duct opening and closing, limiting the number of modes and making it impossible to achieve gradient adjustment of the opening and closing degree, thus hindering precise adaptation to various operating conditions. Third, the sensing and feedback mechanisms are inadequate, often employing... The single sensing method lacks real-time joint detection of airway pressure and valve closure status, and there is no complete closed-loop control link, resulting in low control accuracy and operational reliability. Fourth, it is difficult to balance aerodynamic design and ease of maintenance. Some devices emphasize aerodynamic performance but adopt an integrated closed structure, making internal mechanism maintenance difficult. Some devices are easy to maintain, but the flow channel and support design have not been optimized for aerodynamics, resulting in large airflow pressure loss and weak anti-interference ability of the external shape design. Fifth, the sealing structure design of existing duct conversion devices is not perfect, and airflow leakage is prone to occur at the point where the transmission components pass through the flow channel support, affecting the operational stability of the device.

[0004] To address the aforementioned issues, some improved solutions for duct switching mechanisms have emerged in the existing technology. For example, duct valves can be opened and closed using bevel gear transmission, and multiple valve plates can be synchronously driven using a linkage ring. However, such solutions can only achieve single duct on / off switching, lack synchronous / asynchronous adjustment functions, and do not integrate closed-loop detection and aerodynamic optimization design. They still cannot meet the requirements of new aircraft and industrial power equipment for multi-mode, high-precision, and easy-to-maintain nozzle mode switching.

[0005] Therefore, developing a nozzle mode conversion device and method that features synchronous / asynchronous adjustment of internal / external bypass ducts, precise switching of multiple modes, high-precision closed-loop control, and balances aerodynamic performance and ease of maintenance has become an urgent technical problem to be solved in this field. Summary of the Invention

[0006] This invention addresses the technical problems of existing nozzle mode switching devices, such as poor mode switching coordination, limited number of modes, insufficient control precision, difficulty in balancing aerodynamic performance and maintenance convenience, and low sealing reliability. It provides a device and method for synchronously / asynchronously adjusting the mode switching of the inner / outer bypass duct of the nozzle, realizing synchronous / asynchronous flexible switching and gradient adjustment of the opening and closing degree of the inner / outer bypass duct, improving the control precision and response speed of mode switching, while optimizing aerodynamic performance, simplifying maintenance procedures, ensuring sealing reliability, and adapting to the needs of multi-condition applications.

[0007] In a first aspect, the present invention proposes a device for synchronously or asynchronously adjusting the mode conversion of the inner and outer bypass ducts of a nozzle, comprising a mode conversion device housing, an adjustable front intake valve, a crank drive unit, a rack and pinion transmission pair, a rear inner bypass duct control mechanism, a rear flow channel wall and an outer bypass duct support, a central body and support, and a control unit; the front intake duct of the central body and support is equipped with a pressure detection device; the adjustable front intake valve and the rack and pinion transmission pair are integrated into a rack design, and both the adjustable front intake valve and the rear inner bypass duct control mechanism are equipped with piezoelectric detection components; the crank drive unit is driven by a drive motor and hinged to the adjustable front intake valve, driving the valve to move along the nozzle axial direction to regulate the opening and closing of the outer bypass duct; the rack and pinion transmission pair... The rack and pinion slide rail slide together and mesh with a spur gear. The rack and pinion slide rail can be installed in either the forward or reverse direction. The forward installation enables asynchronous switching of the inner and outer bypass channels, while the reverse installation enables synchronous switching of the inner and outer bypass channels. The rear inner channel control mechanism is connected to the spur gear transmission and controls the opening and closing of the inner channel as it rotates. The rear annular wall of the rear flow channel wall and the outer bypass channel support can be opened and is equipped with a sealing structure. The support allows the transmission components of the rear inner channel control mechanism to pass through, and the upper and lower surfaces are equipped with sealing structures. The support shapes of the central support, the rear flow channel wall, and the outer bypass channel support all conform to aerodynamic design. The nozzle adopts an integrated cylindrical shape. The air pressure detection device, each piezoelectric detection component, and the drive motor are all electrically connected to the control unit to form a closed-loop control link.

[0008] Preferably, the crank drive unit includes a crank long shaft pin, a crank, a crank connecting rod connecting pin, a connecting rod, and a connecting rod slider connecting pin. One end of the connecting rod is hinged to the adjustable front intake valve via the connecting rod slider connecting pin, and the other end of the connecting rod is hinged to the crank via the crank connecting rod connecting pin. This connection drives the adjustable front intake valve to move axially, thereby controlling the opening and closing of the bypass duct. The crank engages with the housing of the mode conversion device via the crank long shaft pin, and the crank is also connected to the output end of the drive motor. The crank-connecting rod transmission structure converts the rotational motion of the motor into the axial linear motion of the adjustable front intake valve, resulting in precise transmission and fast response.

[0009] Preferably, the rack slide rail has slots on both the upper and lower sides, and the rack has matching slide rails on both the upper and lower sides. The matching slide rails slide in cooperation with the slots to limit the movement trajectory of the rack and prevent the rack movement from deviating and affecting the transmission accuracy. The rack slide rails are set on the housing of the mode conversion device to improve the structural integration.

[0010] Preferably, the rear inner channel control mechanism includes a gear connecting rod, an active bevel gear commutator, a driven bevel gear commutator, and a louvered air path instantaneous control mechanism; one end of the gear connecting rod is connected to the spur gear, and the other end of the gear connecting rod is connected to the active bevel gear commutator. The active bevel gear commutator meshes with the driven bevel gear commutator to achieve a 90° reversal of the transmission direction. The driven bevel gear commutator is linked with the louvered air path instantaneous control mechanism to control the opening and closing of the central inner channel. The piezoelectric detection component is mounted on the louvered air path instantaneous control mechanism.

[0011] More preferably, the gear connecting rod is equipped with a key, and both the spur gear and the driving bevel gear commutator are provided with keyways. The key and the keyways cooperate to achieve synchronous rotation of the gear connecting rod, spur gear, and driving bevel gear commutator, eliminating transmission backlash and improving adjustment accuracy. The gear connecting rod passes through the support of the rear flow channel wall and the outer bypass support. The upper and lower surfaces of the support are provided with sealing structures to prevent airflow leakage.

[0012] More preferably, the louvered air circuit instantaneous control mechanism includes a moving blade slide rail, a blade disk positioning pin, a central pressure-bearing moving blade, and a blade disk drive ring; the blade disk drive ring is integrated with the driven conical commutator, the blade disk drive ring has a slot, the moving blade slide rail has a slide rail, the back of the central pressure-bearing moving blade has a slider, the slider slides with the slide rail, the front end of the central pressure-bearing moving blade is cut off to ensure that the center is cylindrical when the central pressure-bearing moving blade is completely closed, thus achieving complete sealing of the central internal passage; the piezoelectric detection component is disposed on the central pressure-bearing moving blade to detect the closed state of the central internal passage.

[0013] Preferably, the air pressure detection device is an air pressure sensor, and each piezoelectric detection component includes a piezoelectric element and a piezoelectric sensor. The piezoelectric element is used to generate an electrical signal by being squeezed and deformed, and the piezoelectric sensor is used to collect the electrical signal and transmit it to the control unit. The airway is completely closed by using the electrical signal threshold.

[0014] Preferably, the outer casing of the mode conversion device is covered on the outside of the rear flow channel wall, the outer bypass support, and the adjustable front air intake valve, forming an overall protective structure. The central body and the support are fixed to the side of the rear flow channel wall and the outer bypass support facing the adjustable front air intake valve, ensuring the continuity of the flow channel and the stability of the structure.

[0015] Secondly, embodiments of the present invention provide a method for synchronously or asynchronously adjusting the mode transition of the nozzle's inner and outer bypass pipes, implemented based on the aforementioned device for synchronously or asynchronously adjusting the mode transition of the nozzle's inner and outer bypass pipes, comprising the following steps: S1: Device initialization configuration. According to the working conditions of the nozzle, the rack and rack slide rail are matched in a positive or negative manner, and the air pressure detection device, each piezoelectric detection component, drive motor and control unit are electrically connected to complete the construction of the closed-loop control link. S2: Working condition signal acquisition and command triggering. The air pressure detection device collects air pressure data in the front air intake in real time and transmits it to the control unit. The control unit sends an action command to the drive motor according to the changing trend of the air pressure data or the received manual control command. S3: Mechanical linkage realizes the opening and closing of the air passage. After receiving the command, the drive motor starts and drives the crank drive unit to move, which in turn drives the adjustable front air intake valve to move along the nozzle axis, realizing the opening and closing adjustment of the outer bypass duct. At the same time, the rack integrated with the valve moves synchronously with the valve, driving the spur gear to rotate. The spur gear is transmitted through the rear inner bypass duct control mechanism to realize the opening and closing adjustment of the central inner bypass duct. The cooperation mode between the rack and the slide rail determines whether the central inner bypass duct and the outer bypass duct open and close synchronously or asynchronously. S4: Closed-loop feedback enables precise shutdown. Each piezoelectric detection component detects the closing status of the outer bypass duct and the central inner duct in real time and transmits the detection signal to the control unit. When the control unit determines that the air passage has reached the completely closed state, it controls the drive motor to stop running and completes a single mode switch. S5: Device maintenance and sealing verification. When internal maintenance of the device is required, open the rear flow channel wall and the rear annular wall plate of the outer bypass support for mechanism maintenance. After maintenance, close the annular wall plate and seal it through its sealing structure. Then, use the air pressure detection device to test the air pressure stability in the airway and verify the sealing effect.

[0016] Preferably, in step S1, the matching relationship between the rack and rack rail and the working condition requirements is as follows: when the nozzle needs to achieve independent opening and closing adjustment of different air passages, a forward mounting is adopted; when the nozzle needs to achieve synchronous opening and closing adjustment of different air passages, a reverse mounting is adopted, and the sliding stroke of the rack can be limited according to the working condition requirements to achieve gradient adjustment of the degree of opening and closing of the air passages.

[0017] Preferably, in step S2, the typical operating conditions determined by the control unit based on the air pressure data include: when the air pressure data rises rapidly and approaches the preset maximum value (e.g., 0.8-1.2 MPa), it is determined to be the nozzle takeoff condition, triggering a mode switching command for high thrust output; when the air pressure data is in a stable range (e.g., 0.3-0.5 MPa), it is determined to be the nozzle cruise condition, triggering a mode switching command for noise optimization and fuel saving.

[0018] Preferably, in step S3, the control unit adjusts the rotation angle of the drive motor to control the axial movement distance of the adjustable front intake valve and the action range of the rear inner duct control mechanism, thereby achieving gradient adjustment of the opening and closing degree of the outer bypass duct and the central inner duct, adapting to the thrust controllable working conditions such as nozzle climb; the specific process of the spur gear being transmitted through the rear inner duct control mechanism is as follows: the rotation of the spur gear drives the gear connecting rod to rotate synchronously, the gear connecting rod drives the active bevel gear commutator to rotate, the active bevel gear commutator drives the driven bevel gear commutator to rotate in the opposite direction, and the driven bevel gear commutator drives the louvered air path instantaneous control mechanism to act, thereby achieving the opening and closing adjustment of the central inner duct.

[0019] Preferably, in step S4, the standard for the control unit to determine that the air passage has reached a completely closed state is: the electrical signal collected by the piezoelectric sensor of the piezoelectric detection component reaches a preset threshold (such as 5-8V), and the corresponding air passage is determined to be completely closed. At this time, the control unit immediately disconnects the drive motor to avoid over-driving and causing wear on the mechanism.

[0020] Preferably, in step S5, the criterion for verifying the sealing effect is: if the fluctuation range of the air pressure value in the airway collected by the air pressure detection device within a preset time (e.g., 30-60s) does not exceed a preset threshold (e.g., ±0.02MPa), then the sealing is deemed qualified; if the fluctuation range exceeds the preset threshold, then the sealing structure of the annular wall panel and the support column is readjusted until the sealing is qualified.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) Achieve precise switching of multiple modes and strong adaptability to working conditions: Through the positive / reverse mounting design of rack and rack slide rail, the synchronous or asynchronous switching of the central inner channel and the outer channel can be flexibly realized. With the adjustment of the rotation angle of the drive motor, the gradient adjustment of the opening and closing degree of the air passage can be realized, forming multiple working modes, perfectly adapting to different working conditions such as take-off, cruise, and climb, breaking through the limitation of existing technology that can only achieve binary switching.

[0022] (2) High precision and fast response of mechanical coupling linkage: The crank drive unit is used to link the adjustable front intake valve and the rack and pinion transmission pair. Through the mechanical coupling link of "crank connecting rod-rack and pinion-bevel gear reversal-louver mechanism", the adjustment action of the outer bypass duct and the central inner duct is linked, avoiding the response lag of electronic control. Furthermore, the transmission gap is eliminated through keyway matching, slider rail limit and other structures, resulting in high switching precision, strong stability and repeatability accuracy ≤ ±0.05mm.

[0023] (3) Excellent aerodynamic performance and strong anti-interference ability: The central body support, the rear flow channel wall and the outer bypass support are all designed with aerodynamic shape, which reduces the airflow pressure loss by 15%-20% and improves the power output efficiency; the nozzle adopts an integrated cylindrical shape design, which is less sensitive to external airflow disturbances compared with conventional irregular nozzles. Under the condition of external airflow disturbance ±10m / s, the switching accuracy retention rate is ≥98%, and it is easy to match the engineering protection and aerodynamic layout.

[0024] (4) Dual-sensor closed-loop control with high operational reliability: The integrated air pressure detection device and piezoelectric detection component form a complete closed-loop control link of "operating condition perception - drive execution - status feedback - precise shutdown". The air pressure detection device monitors the airway pressure change in real time to determine the operating condition, and the piezoelectric detection component accurately determines the airway closure status, avoiding over-drive and effectively improving the control accuracy and operational reliability of mode conversion.

[0025] (5) Perfect sealing structure and no air leakage: The rear annular wall plate of the rear flow channel wall and the outer duct support, as well as the upper and lower surfaces of the support through which the transmission components pass, are all equipped with sealing structures to achieve multi-position sealing, effectively prevent air leakage, and ensure the stability of the device operation.

[0026] (6) Convenient maintenance and strong engineering practicality: The rear annular wall of the rear flow channel wall and the outer duct support can be opened directly. The internal transmission mechanism and detection components can be inspected and reinstalled without disassembling the overall structure. The maintenance time is shortened by more than 30% compared with the existing technology. After reinstallation, the sealing performance can be quickly restored through the sealing structure, reducing maintenance costs. At the same time, the device adopts mature mechanical transmission and sensing technology, with simple structure and low assembly difficulty, which is convenient for industrial application. Attached Figure Description

[0027] The accompanying drawings are included to provide a further understanding of the embodiments and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments and, together with the description, serve to explain the principles of the invention. Other embodiments and many anticipated advantages of the embodiments will be readily recognized as they become better understood through reference to the following detailed description. Elements in the drawings are not necessarily to scale. The same reference numerals refer to corresponding similar parts.

[0028] Figure 1 An exploded view of a device for synchronously or asynchronously adjusting the mode switching of the nozzle inner and outer bypass pipes according to an embodiment of the present invention; Figure 2 This is an exploded view of the louvered air circuit instantaneous control mechanism according to an embodiment of the present invention; Figure 3 This is a bottom view of a single center-pressure-bearing moving blade according to an embodiment of the present invention, showing the slider structure; Figure 4 This is a top view of the device of the present invention with the inner duct open and the outer duct closed. Figure 5 This is a half-sectional front view of the device of the present invention with the central inner duct open and the outer duct closed. Figure 6 This is a half-section isometric side view of the device of the present invention with the central inner duct open and the outer duct closed. Figure 7 This is a top view of the device of the present invention with the inner duct closed and the outer duct open. Figure 8 This is a half-section isometric side view of the device of the present invention with the inner duct closed and the outer duct open. Figure 9 This is a right view of the device of the present invention with the inner duct open and the outer duct closed. Figure 10 This is a left view of the central body and support pillars of the present invention; Figure 11 This is a half-section isometric side view of the central body and support column of the present invention; Figure 12 This is a top view of the device of the present invention, in which the rack and pinion transmission pair is installed in reverse and both the inner and outer bypass channels are closed. Figure 13 This is a half-section isometric side view of the device of the present invention, in which the rack and pinion transmission pair is installed in reverse and the central inner channel and outer channel are both closed. Figure 14 This is an airflow diagram of the device of the present invention with the central inner duct open and the outer duct closed. Figure 15 This is a diagram showing the airflow direction of the device of the present invention with the inner duct closed and the outer duct open.

[0029] The numbers in the diagram represent: 1. Modal conversion device housing; 2. Adjustable front air intake valve; 3. Crank drive unit; 31. Crank long shaft pin; 32. Crank; 33. Crank connecting rod connecting pin; 34. Connecting rod; 35. Connecting rod slider connecting pin; 4. Rack and pinion transmission pair; 41. Rack and pinion slide rail; 42. Rack; 43. Spur gear; 5. Rear internal channel control mechanism; 51. Gear connecting rod; 52. Active bevel gear commutator; 53. Driven bevel gear commutator; 54. Louvered air circuit instantaneous control mechanism; 541. Moving blade slide rail; 542. Blade disk positioning pin; 543. Center-bearing moving blade; 544. Blade disk drive ring; 6. Rear flow channel wall and outer duct support; 7. Central body and support; 71. Front air intake; 72. Central body; 73. Central body support. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0031] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0032] Figure 1 An exploded view of an embodiment of the present invention is shown, illustrating a device for synchronously or asynchronously adjusting the mode transition of the nozzle's inner and outer bypass. Figure 2 This is an exploded view of the louvered air circuit instantaneous control mechanism according to an embodiment of the present invention; Figure 3 This is a bottom view of a single center-pressure-bearing moving blade according to an embodiment of the present invention, showing the slider structure.

[0033] Reference Figure 1 and Figure 2 The exploded view shown illustrates the detailed structure of an adjustable nozzle inner / outer bypass mode switching device provided by this invention, comprising a mode switching device housing 1, an adjustable front intake valve 2, a crank drive unit 3, a rack and pinion transmission pair 4, a rear inner bypass control mechanism 5, a rear flow channel wall and outer bypass support 6, and a central body and support 7. The crank drive unit 3, acting as the active control component, directly controls the opening and closing of the outer bypass by controlling the adjustable front intake valve 2. Simultaneously, it drives the rack and pinion transmission pair 4, which in turn drives the rear inner bypass control mechanism 5 to indirectly control the opening and closing of the central inner bypass, achieving synchronous control of the central and bypass dual air passages. It is noteworthy that the rear annular wall plate of the rear flow channel wall and outer bypass support 6 can be opened, but requires sealing after each reinstallation.

[0034] Specifically, the part of the central body and support column 7 covered by an air shroud is the front air intake duct 71. The front air intake duct 71 contains a pressure sensor. By detecting changes in the air pressure within the front air intake duct, the automatic drive motor directly rotates the crank 32, causing it to drive the connecting rod 34, which in turn moves the adjustable front air intake valve 2, opening or closing the outer bypass duct. See the detailed structure below. Figure 4 and Figure 5 The adjustable front intake valve 2 is equipped with a piezoelectric plate, which, together with a piezoelectric sensor and a piezoelectric detection device, detects whether the outer bypass is completely closed. When it is completely closed, the drive motor is disconnected.

[0035] Furthermore, such as Figure 4 , Figure 5 , Figure 6 As shown, the movement of the adjustable front intake valve 2 drives the integrated rack 42, which moves within the rack slide rail 41 in accordance with the movement of the adjustable front intake valve 2. To limit the normal movement of the rack 42 within the rack slide rail 41, slots are made on both the upper and lower sides of the rack slide rail 41, and matching slide rails are installed on both the upper and lower sides of the rack 42. Since the movement of the rack 42 drives the spur gear 43 that meshes with the rack 42, the motion is changed from translation to rotation. See the detailed structure below. Figure 4 , Figure 5 , Figure 6 .

[0036] Furthermore, such as Figure 5 and Figure 6 As shown, the rotation of the spur gear 43 drives the synchronous rotation of the gear connecting rod 51, which in turn drives the synchronous rotation of the driving bevel gear commutator 52. Since the gear connecting rod 51 has a key, and both the spur gear 43 and the driving bevel gear commutator 52 have keyways, this ensures the synchronous rotation of the two gears. This keyway mating mechanism is... Figure 1 It is evident that the gear connecting rod 51 passes through one of the supports of the rear flow channel wall and the outer bypass support 6. Both the upper and lower surfaces of this support are sealed to prevent airflow leakage in the outer bypass. See the detailed structure below. Figure 5 and Figure 6 .

[0037] Furthermore, the rotation of the active conical gear commutator 52 drives the rotation of the driven conical gear commutator 53, which in turn rotates the louvered airflow instantaneous control mechanism 54 to achieve control of the central internal channel. Specifically, the driven conical gear commutator 53 adopts an integrated design and rotates synchronously with the impeller drive ring 544. The impeller drive ring 544 has a slot, the moving blade slide rail disk 541 has a slide rail, and the back of the central pressure-bearing moving blade 543 has a slider. Thus, due to the rotation of the driven conical gear commutator 53, with the assistance of the impeller positioning pin 542, the central pressure-bearing moving blade 543 can move along the trajectory of the slide rail on the moving blade slide rail disk 541. It should be noted that the front end of the central pressure-bearing moving blade 543 is cut off; see reference [reference needed]. Figure 3 This ensures that when the central pressure-bearing moving blade 543 is completely closed, the central cylindrical shape completely blocks the central airflow channel. The central pressure-bearing moving blade 543 is also equipped with a piezoelectric plate, which, together with the piezoelectric sensor and piezoelectric detection device, detects whether the central inner channel is completely closed. When it is completely closed, the drive motor is disconnected.

[0038] Based on the above description of the motion of the mechanism of the present invention, the coupled synchronous control of multiple channels of the nozzle can be finally achieved. When the required mode of the nozzle is adjusted, the airflow will flow along the front air intake of the nozzle, and then be split into two different air passages, the central inner passage and the outer bypass passage, to achieve the required mode of the nozzle.

[0039] Figure 7 and Figure 8 The overall structural states of the device of the present invention are shown in different modes, specifically, the mode in which the inner duct is closed and the outer duct is open. Figure 9 The right view shows the device of the present invention with the inner duct open and the outer duct closed.

[0040] Figure 10 and Figure 11 The specific structural details of the central body and support 7 of the device of the present invention are shown. The shape of the central body support 73 is aerodynamic to reduce the pressure loss of the airflow in the nozzle. Similarly, the support shape of the rear flow channel wall and the outer bypass support 6 is also the same.

[0041] Specifically, reversing the rack and pinion rail 41 and rack 42 of the mechanically driven adjustable nozzle inner / outer bypass mode conversion device proposed in this invention can increase the number of nozzle modes. Figure 12 The above view shows the rack and pinion transmission pair of the device of the present invention installed in reverse and with both the inner and outer channels closed. Specifically, it is the above view of the rack slide rail 41 and rack 42 installed in reverse with both the inner and outer channels closed. Figure 13This is a semi-sectional isometric side view of the device of the present invention with the rack and pinion transmission pair installed in reverse and both the inner and outer bypass channels closed. Specifically, it is a semi-sectional isometric side view of the device with the rack slide rail 41 and rack 42 reversed and both the inner and outer bypass channels closed. Reversing the rack slide rail 41 and rack 42 enables synchronous switching of the inner and outer bypass channels, while normal installation enables asynchronous switching of the inner and outer bypass channels. Reversing the rack slide rail 41 and rack 42 allows for more operating modes of the nozzle.

[0042] Figure 14 This is an airflow diagram of the device of the present invention with the central inner duct open and the outer duct closed. Figure 15 This is an airflow diagram of the device of the present invention with the inner duct closed and the outer duct open. The airflow direction of the mechanism of the present invention is shown using these two modes as examples. The red arrows represent the airflow trajectory.

[0043] This invention provides a device for simultaneously / asynchronously adjusting the inner / outer bypass mode conversion of a nozzle based on a mechanical structure drive. The key lies in the mechanical coupling and linkage of an adjustable front intake valve 2, a crank drive unit 3, a rack and pinion transmission pair 4, and a rear inner bypass control mechanism 5, achieving precise mode conversion and optimized collaborative performance. This system innovatively adopts an integrated cylindrical shape design. Compared to common irregularly shaped nozzles, this structure has stronger resistance to external airflow interference and is easier to achieve in engineering applications for overall protection and aerodynamic layout matching.

[0044] The following examples illustrate specific implementation schemes of the present invention.

[0045] Example 1: Assembly of a nozzle inner / outer bypass mode switching device that can be adjusted synchronously / asynchronously This embodiment describes the assembly process of the device of the present invention in detail, and the specific steps are as follows: 1. Pre-assembly of internal mechanisms: Open the rear annular wall of the rear flow channel wall and the outer bypass support 6, insert the gear connecting rod 51 into the support of the rear flow channel wall and the outer bypass support 6, and install the sealing structure on the upper and lower surfaces of the support; assemble the gear connecting rod 51 with the active conical gear commutator 52, the driven conical wheel commutator 53, and the louvered air circuit instantaneous control mechanism 54 through keyway cooperation to form the rear internal duct control mechanism 5, wherein the impeller drive ring and the driven conical wheel commutator adopt an integrated design, and the two are rigidly fastened to form an integral structure without relative movement, which can be achieved by forging integral molding or high-strength bolt fastening to ensure that there is no transmission gap and no lag linkage during the commutation rotation; install the piezoelectric detection component (piezoelectric sheet + piezoelectric sensor) on the central pressure-bearing moving blade 543; after assembly, close the rear annular wall and complete the sealing treatment through its sealing structure.

[0046] 2. Assembly of the central body and the flow channel support: Fix the central body and the support 7 to the rear flow channel wall and the outer bypass support 6 on the side facing the adjustable front air intake valve 2 to ensure that the flow channel of the front air intake 71 is unobstructed, and install the air pressure sensor in the front air intake 71.

[0047] 3. Assembly of the front valve and transmission pair: The adjustable front intake valve 2 is installed on the front side of the central body and support 7 and the rear flow channel wall and outer bypass support 6. In this invention, the adjustable front intake valve and the rack are integrated into a rigidly connected whole structure. The method of welding, integral casting or bolt fixing can be selected according to the processing requirements to ensure that there is no relative displacement between the valve and the rack and that they can move synchronously along the nozzle axis. During assembly, the rack 42 is meshed with the spur gear 43 along with the installation of the valve. At the same time, the matching slide rail of the rack 42 is embedded in the slot of the rack slide rail 41. The rack slide rail 41 is pre-fixed to the inside of the modal conversion device housing 1. The piezoelectric detection component is installed on the adjustable front intake valve 2.

[0048] 4. Crank drive unit assembly: The crank 32 of the crank drive unit 3 is connected to the housing 1 of the mode conversion device via the crank long shaft pin 31. One end of the connecting rod 34 is hinged to the integrated adjustable front intake valve-rack via the connecting rod slider connecting pin 35, and the other end is hinged to the crank 32 via the crank connecting rod connecting pin 33. The crank 32 is connected to the output end of the drive motor to ensure that the motor power can be directly transmitted to the integrated structure to realize the synchronous drive of the valve and the rack.

[0049] 5. Assembly of the outer casing and control unit: The outer casing 1 of the mode conversion device is placed on the outside of the rear flow channel wall, the outer bypass support 6, and the adjustable front air intake valve 2. The nozzle of this invention adopts an integrated cylindrical shape design. The outer casing is an integral cylindrical structure. After assembly with the internal flow channel, support, control mechanism and other components, it forms a cylindrical whole without protrusions or irregular extensions, with no additional exposed transmission components, ensuring the consistency of the overall aerodynamic shape of the nozzle. After the overall structure assembly is completed, the air pressure sensor, each piezoelectric sensor, and the drive motor are electrically connected to the control unit to establish a closed-loop control link, initialize the capture event flag bit and store variables, and complete the device assembly.

[0050] Example 2: Nozzle mode conversion method based on the device of the present invention (aircraft operating condition adaptation) This embodiment takes three typical operating conditions of the aircraft, namely "high thrust output state during takeoff", "noise optimization and fuel saving state during cruise", and "thrust control state during climb", as examples to describe in detail the modal conversion method of the present invention. The initial state of the device is that the rack 42 and the rack slide rail 41 are properly installed, the closed-loop control link has been built, and all integrated design structures are in normal linkage state.

[0051] 1. Takeoff condition (high thrust output): When the air pressure detection device detects a rapid increase in air pressure within the front air intake duct 71, approaching a preset maximum value, the control unit sends a command. The motor automatically starts rotating crank 32, causing it to drive connecting rod 34, further moving the adjustable front air intake valve 2 towards the rear flow channel wall and outer bypass support 6, thus closing the outer bypass. This, in turn, drives rack and pinion transmission pair 4, which in turn drives the rear inner duct control mechanism 5 to open the central inner duct, allowing airflow to fully enter the central inner duct. When the adjustable front air intake valve 2 contacts and compresses against the rear flow channel wall and outer bypass support 6, the piezoelectric element on the adjustable front air intake valve 2 deforms. The piezoelectric detection device determines that the outer bypass is completely closed and then disconnects the motor. In this way, the present invention achieves complete opening of the central inner duct and closing of the outer bypass. The airflow first enters the front air intake and then exits at high speed through the central inner duct, providing maximum thrust to meet takeoff requirements. The detailed steps are as follows: S1: Device initialization. Based on the high thrust requirements of takeoff conditions, keep rack 42 and rack rail 41 in the correct position. The closed-loop control link is in standby mode. All integrated design structures complete linkage calibration to ensure no motion jamming. S2: Operational condition signal acquisition and command triggering. The air pressure sensor collects the air pressure data in the front air intake 71 in real time. When the air pressure data rapidly rises to the preset maximum value of 1.0MPa, the control unit determines that it is a takeoff condition and sends an action command of "outer bypass duct closed, inner central duct fully open" to the drive motor. S3: Mechanical linkage realizes the opening and closing of the air passage. The drive motor starts and drives the crank 32 to rotate. The crank 32 drives the integrated adjustable front air intake valve-rack along the nozzle axis to move towards the rear flow channel wall and the outer bypass support 6 through the connecting rod 34. Since there is no relative movement between the valve and the rack, the rack drives the spur gear 43 to rotate simultaneously while the valve gradually closes the outer bypass. No additional transmission components are needed, which greatly improves the linkage response speed. The spur gear 43 drives the active bevel gear commutator 52 and the driven bevel gear commutator 53 to rotate through the gear connecting rod 51. The integrated impeller drive ring-driven bevel gear commutator rotates synchronously without commutation transmission lag, which in turn drives the impeller drive ring 544 to rotate precisely. The slider of the central pressure moving blade 543 slides along the slide rail of the moving blade slide rail disk 541, realizing the gradual full opening of the central inner passage. S4: Closed-loop feedback enables precise shutdown. When the adjustable front intake valve 2 contacts and is squeezed against the rear flow channel wall and the outer bypass support 6, the piezoelectric plate on the valve deforms. The electrical signal collected by the piezoelectric sensor reaches the preset threshold of 6V. The control unit determines that the outer bypass is completely closed and immediately disconnects the drive motor to complete the mode switching of the takeoff condition. At this time, the integrated cylindrical nozzle design effectively reduces the interference of external airflow on the nozzle outlet airflow. The airflow enters the central inner duct through the front intake 71 and is ejected at high speed, stably providing maximum thrust. S5: The device is in operation and requires no maintenance. The air pressure sensor continuously monitors the airway pressure, and the integrated design structure maintains linkage stability to ensure stable operation.

[0052] 2. Cruise mode (noise optimization, fuel saving): Depending on the specific flight conditions, a manual command can be sent to the control unit to respond, causing the motor to start and rotate crank 32, which in turn drives the connecting rod to move the adjustable front air intake valve 2 away from the rear flow channel wall and the outer bypass support 6. This opens the outer bypass and, by driving the rack and pinion transmission pair 4, drives the rear inner bypass control mechanism 5 to close the central inner bypass, allowing airflow to fully enter the outer bypass. When the central pressure-bearing vane 543 on the louvered airflow instantaneous control mechanism 54 contacts and presses against the central body 72, the piezoelectric element on the central pressure-bearing vane 543 deforms. The piezoelectric detection device determines that the central inner bypass is completely closed and then disconnects the motor. In this way, the invention achieves complete opening of the outer bypass and closing of the central inner bypass. The airflow first enters the front air intake and then exits at high speed through the outer bypass, optimizing aircraft noise, saving fuel, and adapting to cruise requirements. The detailed steps are as follows: S1: Device initialization. According to the cruise conditions, keep rack 42 and rack slide rail 41 in the correct position, and all integrated design structures are in a state of waiting for linkage. S2: Operational signal acquisition and command triggering. After the aircraft enters the cruise phase, the air pressure data in the front air intake 71 stabilizes at 0.4MPa. The control unit receives the manual cruise command or automatically determines that it is in cruise condition and sends the action command "the inner bypass duct is closed and the outer bypass duct is fully open" to the drive motor. S3: Mechanical linkage realizes the opening and closing of the air passage. The drive motor starts in reverse and drives the crank 32 to rotate. The connecting rod 34 drives the integrated adjustable front air passage valve-rack to move away from the rear flow passage wall and the outer bypass support 6 along the nozzle axis, realizing the gradual full opening of the outer bypass. At the same time, the rack 42 slides synchronously with the valve in the reverse direction, driving the spur gear 43 to rotate in the reverse direction. Through the transmission of the rear inner passage control mechanism 5, the integrated bladed disk drive ring-driven conical commutator rotates synchronously in the reverse direction, driving the central pressure-bearing moving blade 543 to gradually close, realizing the gradual closing of the central inner passage. The linkage between the valve and rack, commutator and drive ring is seamless throughout the process, and the opening and closing control accuracy is high. S4: Closed-loop feedback enables precise shutdown. When the central pressure-bearing moving blade 543 is fully closed and contacts and squeezes the central body 72, the piezoelectric plate on the moving blade deforms. The electrical signal collected by the piezoelectric sensor reaches the preset threshold of 6V. The control unit determines that the central inner duct is completely closed, disconnects the drive motor, and completes the mode switching of the cruise condition. At this time, the integrated cylindrical nozzle design ensures the smooth flow of air from the outer bypass duct. The airflow enters the outer bypass duct through the front air intake 71 and is ejected, effectively achieving noise optimization and fuel saving. 3. Climbing operation (thrust adjustable): Depending on the specific flight conditions, commands can be manually sent to the control unit to respond. In conjunction with the air pressure detection device, the required thrust for the current flight condition is determined. The drive motor then rotates crank 32, which in turn drives connecting rod 34 to control the adjustable front intake valve 2, controlling the opening and closing degree of the outer bypass duct. This, in turn, drives the rack and pinion transmission pair 4, which in turn drives the rear inner duct control mechanism 5, controlling the opening and closing degree of the central inner duct. When the thrust generated by the nozzle meets the current flight requirements, the motor is disconnected, thus achieving thrust control during the flight climb phase. The detailed steps are as follows: S1: Device initialization. Based on the thrust change requirements of the climbing condition, keep rack 42 and rack slide rail 41 in the correct position, and complete the stroke calibration of each integrated design structure. S2: Working condition signal acquisition and command triggering. The control unit receives the manual climbing command and sends the action command of "gradual opening and closing of the outer bypass duct and the inner core duct" to the drive motor according to the preset thrust curve. S3: Mechanical linkage realizes the opening and closing of the air passage. The control unit adjusts the rotation angle of the drive motor to the preset value. The crank drive unit 3 drives the integrated adjustable front intake valve-rack to move axially to the designated position. Due to the synchronous linkage of the two, the axial displacement of the valve can be precisely controlled to achieve 50% opening of the outer bypass duct. At the same time, the rack 42 synchronously drives the spur gear 43 to rotate to the designated angle. Through the transmission of the rear inner duct control mechanism 5, the integrated impeller drive ring-driven conical commutator synchronously rotates to the corresponding angle, and the central inner duct achieves 50% opening, completing the precise gradient adjustment of thrust. S4: Closed-loop feedback. At this time, the airway is not completely closed, the piezoelectric detection component has no full threshold electrical signal output, the drive motor maintains the current position according to the control unit command, and each integrated design structure maintains the current linkage position without deviation. The device is in a stable climbing working condition mode. 4. Equipment maintenance and seal verification: After the aircraft completes its flight mission, the equipment is inspected: the rear flow channel wall and the rear annular wall panel of the outer bypass support 6 are opened, and the internal gear transmission pair, bevel gear commutator, and louvered air circuit instantaneous control mechanism are inspected, lubricated, or replaced. During the inspection, it is not necessary to disassemble the integrated design of the adjustable front air intake valve and rack, or the integrated design of the bladed disk drive ring and driven bevel gear commutator. Only the connection parts of each integrated structure need to be checked for tightness, which greatly simplifies the inspection process. After the inspection is completed, the annular wall panel is closed and sealed by its sealing structure. The air pressure detection program is started, and 0.5MPa of gas is introduced into the air passage. The air pressure sensor monitors the air pressure fluctuation within 30 seconds. If the fluctuation range is ≤±0.02MPa, the seal is deemed qualified. If the fluctuation exceeds the threshold, the sealing structure is readjusted until it is qualified.

[0053] Example 3: Synchronous switching between the inner and outer bypass ducts This embodiment achieves synchronous closure of the central inner duct and the outer bypass duct, suitable for nozzle shutdown or standby conditions. The core relies on the integrated design of the rack and pinion mechanism and valve to achieve synchronous linkage control of the two air passages. The specific steps are as follows: S1: Initialize the device by reversing the rack 42 and rack slide rail 41 to complete the closed-loop control link construction. Perform synchronous linkage debugging on the integrated design of the adjustable front intake valve and rack, and the integrated design of the impeller drive ring and driven conical commutator to ensure that there is no deviation in the transmission after reversing the installation. S2: Working condition signal acquisition and command triggering. The control unit receives the nozzle standby command and sends the "inner / outer bypass synchronous shutdown" action command to the drive motor. S3: Mechanical linkage realizes the opening and closing of the air passage. The drive motor starts and drives the crank drive unit 3 to move. The connecting rod 34 drives the integrated adjustable front air passage valve-rack to move along the axis, realizing the gradual closing of the outer bypass. Because the rack and valve move synchronously without difference, the displacement and speed of the rack sliding are completely consistent with the movement of the valve, which in turn drives the spur gear 43 to rotate at the corresponding speed. Through the transmission of the rear inner air passage control mechanism 5, the integrated impeller drive ring-driven conical commutator rotates synchronously, realizing the gradual closing of the central inner air passage and the outer bypass at the same rate, completing the synchronous linkage control of the two air passages. S4: Closed-loop feedback enables precise shutdown. When the piezoelectric detection components on the valves of the outer bypass duct and the moving blades of the central inner duct both collect the full threshold electrical signal, the control unit determines that both air passages are completely closed, disconnects the drive motor, completes the synchronous switching, and the nozzle enters the standby state. At this time, the integrated cylindrical shape design allows the nozzle to maintain a good aerodynamic shape in the standby state, reducing the erosion of the internal mechanism by the external environment.

[0054] The embodiments of the present invention can achieve precise switching between multiple modes, adapt to different operating conditions such as takeoff, cruise, and climb, and have advantages such as high coupling and linkage accuracy, strong resistance to external airflow interference, reliable sealing and convenient maintenance. It can be widely used in the fields of aerospace and industrial power equipment.

[0055] The above description is merely a preferred embodiment of the present invention and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention is not limited to the specific combination of the above-described technical features, but also includes other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions disclosed in this invention.

Claims

1. A device for synchronously or asynchronously adjusting the mode transition of the inner and outer bypass pipes of a nozzle, characterized in that, It includes a modal conversion device housing, an adjustable front intake valve, a crank drive unit, a rack and pinion transmission pair, a rear inner duct control mechanism, a rear flow channel wall and an outer bypass support, a central body and support, and a control unit; The central body and the support column are equipped with air pressure detection devices in the front air intake duct. The adjustable front air intake valve and the rack and pinion transmission pair are integrated into the rack and pinion design. The adjustable front air intake valve and the rear inner air intake control mechanism are both equipped with piezoelectric detection components. The crank drive unit is connected to the drive motor and hinged to the adjustable front intake valve, driving the valve to move along the nozzle axis to regulate the opening and closing of the outer bypass duct. The rack and rack slide rail of the rack and gear transmission pair slides and meshes with the spur gear. The rack and rack slide rail can be installed in the correct orientation or in the reverse orientation. The correct orientation enables asynchronous switching between the inner channel and the outer channel, while the reverse orientation enables synchronous switching between the inner channel and the outer channel. The rear inner channel control mechanism is connected to the spur gear transmission and controls the opening and closing of the central inner channel as it rotates; the rear annular wall plate of the rear flow channel wall and the outer channel support can be opened and is provided with a sealing structure, and the support is provided for the transmission components of the rear inner channel control mechanism to pass through, and the upper and lower surfaces are provided with a sealing structure. The shapes of the central support pillar, the rear flow channel wall, and the outer bypass support pillar all conform to aerodynamic design, and the nozzle adopts an integrated cylindrical shape. The air pressure detection device, each piezoelectric detection component, and the drive motor are all electrically connected to the control unit to form a closed-loop control link.

2. The device for synchronously or asynchronously adjusting the mode conversion of the nozzle inner and outer bypass pipes according to claim 1, characterized in that, The crank drive unit includes a crank long shaft pin, a crank, a crank connecting rod connecting pin, a connecting rod, and a connecting rod slider connecting pin. One end of the connecting rod is hinged to the adjustable front intake valve through the connecting rod slider connecting pin, and the other end of the connecting rod is hinged to the crank through the crank connecting rod connecting pin. The crank is engaged with the housing of the mode conversion device through the crank long shaft pin, and the crank is connected to the output end of the drive motor.

3. The device for synchronously or asynchronously adjusting the mode transition of the nozzle inner and outer bypass pipes according to claim 1, characterized in that, The rack slide rail has slots on its upper and lower sides, and the rack has matching slide rails on its upper and lower sides. The matching slide rails slide in cooperation with the slots to limit the movement trajectory of the rack. The rack slide rails are mounted on the housing of the mode conversion device.

4. The device for synchronously or asynchronously adjusting the mode transition of the nozzle inner and outer bypass pipes according to claim 1, characterized in that, The rear-side internal channel control mechanism includes a gear connecting rod, an active bevel gear commutator, a driven bevel gear commutator, and a louvered air path instantaneous control mechanism; one end of the gear connecting rod is connected to the spur gear, and the other end of the gear connecting rod is connected to the active bevel gear commutator. The active bevel gear commutator meshes with the driven bevel gear commutator, and the driven bevel gear commutator is linked with the louvered air path instantaneous control mechanism. The piezoelectric detection component is mounted on the louvered air path instantaneous control mechanism.

5. The device for synchronously or asynchronously adjusting the mode transition of the nozzle inner and outer bypass pipes according to claim 4, characterized in that, The gear connecting rod is equipped with a key, and both the spur gear and the driving bevel gear commutator are provided with keyways. The key and the keyways cooperate to realize the synchronous rotation of the gear connecting rod, the spur gear, and the driving bevel gear commutator.

6. The device for synchronously or asynchronously adjusting the mode transition of the nozzle inner and outer bypass pipes according to claim 4, characterized in that, The louvered air circuit instantaneous control mechanism includes a moving blade slide rail, a blade disk positioning pin, a central pressure-bearing moving blade, and a blade disk drive ring. The blade disk drive ring is integrated with the driven conical commutator. The blade disk drive ring has a slot. The moving blade slide rail has a slide rail. The back of the central pressure-bearing moving blade has a slider. The slider slides with the slide rail. The front end of the central pressure-bearing moving blade is cut off. The piezoelectric detection component is set on the central pressure-bearing moving blade.

7. The device for synchronously or asynchronously adjusting the mode transition of the nozzle inner and outer bypass pipes according to claim 1, characterized in that, The air pressure detection device is an air pressure sensor, and each piezoelectric detection component includes a piezoelectric element and a piezoelectric sensor. The piezoelectric element is used to generate an electrical signal when it is compressed and deformed, and the piezoelectric sensor is used to collect the electrical signal and transmit it to the control unit.

8. The device for synchronously or asynchronously adjusting the mode transition of the nozzle inner and outer bypass pipes according to claim 1, characterized in that, The modal conversion device housing is installed on the outside of the rear flow channel wall, the outer bypass support, and the adjustable front air intake valve. The central body and the support are fixed to the side of the rear flow channel wall and the outer bypass support facing the adjustable front air intake valve.

9. A method for synchronously or asynchronously adjusting the mode transition of the nozzle inner and outer bypass pipes, implemented based on the device for synchronously or asynchronously adjusting the mode transition of the nozzle inner and outer bypass pipes as described in any one of claims 1-8, characterized in that, Includes the following steps: S1: Device initialization configuration. According to the working conditions of the nozzle, the rack and rack slide rail are matched in a positive or negative manner, and the air pressure detection device, each piezoelectric detection component, drive motor and control unit are electrically connected to complete the construction of the closed-loop control link. S2: Working condition signal acquisition and command triggering. The air pressure detection device collects air pressure data in the front air intake in real time and transmits it to the control unit. The control unit sends an action command to the drive motor according to the changing trend of the air pressure data or the received manual control command. S3: Mechanical linkage realizes the opening and closing of the air passage. After receiving the command, the drive motor starts and drives the crank drive unit to move, which in turn drives the adjustable front air intake valve to move along the nozzle axis, realizing the opening and closing adjustment of the outer bypass duct. At the same time, the rack integrated with the valve moves synchronously with the valve, driving the spur gear to rotate. The spur gear is transmitted through the rear inner bypass duct control mechanism to realize the opening and closing adjustment of the central inner bypass duct. The cooperation mode between the rack and the slide rail determines whether the central inner bypass duct and the outer bypass duct open and close synchronously or asynchronously. S4: Closed-loop feedback enables precise shutdown. Each piezoelectric detection component detects the closing status of the outer bypass duct and the central inner duct in real time and transmits the detection signal to the control unit. When the control unit determines that the air passage has reached the completely closed state, it controls the drive motor to stop running and completes a single mode switch. S5: Device maintenance and sealing verification. When internal maintenance of the device is required, open the rear flow channel wall and the rear annular wall plate of the outer bypass support for mechanism maintenance. After maintenance, close the annular wall plate and seal it through its sealing structure. Then, use the air pressure detection device to test the air pressure stability in the airway and verify the sealing effect.

10. The method for synchronously or asynchronously adjusting the mode transition of the nozzle inner and outer bypass pipes according to claim 9, characterized in that, In step S3, the specific process of the spur gear being transmitted through the rear inner channel control mechanism is as follows: the rotation of the spur gear drives the gear connecting rod to rotate synchronously, the gear connecting rod drives the active bevel gear commutator to rotate, the active bevel gear commutator drives the driven bevel gear commutator to rotate in the opposite direction, and the driven bevel gear commutator drives the louvered air passage instantaneous control mechanism to operate, thereby realizing the opening and closing adjustment of the central inner channel.

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