阅读说明：本技术 一种s弯偏距可调的航空发动机进气道 (S bending offset adjustable aircraft engine air inlet duct ) 是由 彭元 董晗 顾烨峰 张泽一 李传鹏 朱春雨 于 2021-01-19 设计创作，主要内容包括：本发明公开了一种S弯偏距可调的航空发动机进气道,对传统S形进气道的结构进行优化,通过在进气道中安装偏距调节装置的控制进气道中心线和面积变化,从而在飞行器没有隐身需求的任务时域削弱进气道中S弯的偏距、减小流动损失和出口气流畸变,在飞行器需要前向隐身时恢复S弯布局。(The invention discloses an aircraft engine air inlet with adjustable S-bend offset distance, which optimizes the structure of the traditional S-shaped air inlet, and controls the central line and area change of the air inlet by installing an offset distance adjusting device in the air inlet, thereby weakening the offset distance of the S-bend in the air inlet in a mission time domain without stealth requirements of an aircraft, reducing flow loss and outlet airflow distortion, and recovering the S-bend layout when the aircraft needs forward stealth.)

1. An S-bend offset adjustable aircraft engine air inlet passage is characterized by comprising an air inlet passage body and an offset adjusting device arranged in the air inlet passage body;

the air inlet channel body comprises an upper wall surface, a lower wall surface, a first side wall and a second side wall, wherein a vertical sliding groove is formed in the first side wall, and a sliding block is arranged in the sliding groove;

the offset adjusting device comprises an adjusting block, a motor, a driving gear, a transmission rod, a first driving gear, a second driving gear, a first rack and a second rack;

the first rack and the second rack are respectively arranged on the first side walls on two sides of the sliding groove and are parallel to the sliding groove;

the adjusting block comprises an upper plate, a lower plate, a first side plate and a second side plate, wherein the upper plate and the lower plate are arc panels, the curvature of the lower plate is larger than that of the upper plate, and two ends of the lower plate are respectively and correspondingly fixedly connected with two ends of the upper plate; one side of the upper plate and one side of the lower plate are vertically and fixedly connected with the first side plate, and the other side of the upper plate and the lower plate are vertically and fixedly connected with the second side plate, so that a closed structure is formed;

a first partition plate and a second partition plate which are vertically arranged are arranged in the adjusting block, and through holes for the transmission rod to pass through are formed in the first partition plate and the second partition plate;

the motor, the driving gear, the transmission rod, the first driving gear and the second driving gear are all arranged in the adjusting block, wherein the driving gear, the transmission gear, the first driving gear and the second driving gear are all hollow straight gears; one end of the transmission rod is coaxially and fixedly connected with the central hole of the first driving gear, the other end of the transmission rod is coaxially and fixedly connected with the central hole of the second driving gear after sequentially penetrating through the through hole in the first partition plate, the central hole of the transmission gear and the through hole in the second partition plate, the transmission rod is coaxially and fixedly connected with the transmission gear, and the transmission rod is rotationally connected with the first partition plate and the second partition plate;

the first side plate of the adjusting block is fixedly connected with a sliding block in a sliding groove in the first side wall, so that the adjusting block can freely slide up and down along the sliding groove; the first side plate is provided with a through hole for the first driving gear and the second driving gear to penetrate out;

the motor is fixed in the adjusting block, and an output shaft of the motor is coaxially and fixedly connected with a central hole of the driving gear; the adjusting block is arranged on the adjusting block and is connected with a first gear rack and a second gear rack through a first gear;

when the adjusting block slides to the uppermost end along the sliding groove of the first side wall, the upper plate of the adjusting block is attached to the upper wall surface of the air inlet channel body, and the lower plate is matched with the air inlet channel body to form an S-shaped air inlet channel; when the regulating block slides to the lowest end along the sliding groove of the first side wall, the lower plate of the regulating block is attached to the lower wall surface of the air inlet channel body, and the upper plate is matched with the air inlet channel body to form a linear air inlet channel.

Technical Field

The invention relates to the field of design of an aircraft engine air inlet, in particular to an aircraft engine air inlet with adjustable S bending deflection distance.

Background

In recent years, stealth unmanned aerial vehicles are continuously developed in various countries in the world, and a plurality of tasks performed by the stealth unmanned aerial vehicles require good stealth performance, so that S-shaped air inlets are provided, and the air inlets can shield engine blades through S bends in the air inlets, so that the forward radar reflection area of an aircraft is reduced. However, the S-shaped air inlet channel can improve the forward stealth of the aircraft and simultaneously sacrifice the pneumatic performance of the air inlet channel to a certain extent, and due to the influence of secondary flow in the pipe, the total pressure recovery coefficient of the outlet of the air inlet channel is reduced, the rotational flow distortion is enhanced, so that the working stability of the engine is reduced, the thrust of the engine is lost, the oil consumption is increased, and the requirement of long-term flight of the unmanned aerial vehicle is not facilitated.

Disclosure of Invention

The invention aims to solve the technical problem of providing an aircraft engine air inlet channel with adjustable S bending deflection distance aiming at the defects in the background technology.

The invention adopts the following technical scheme for solving the technical problems:

an S-bend offset adjustable aero-engine air inlet comprises an air inlet body and an offset adjusting device arranged in the air inlet body;

the air inlet channel body comprises an upper wall surface, a lower wall surface, a first side wall and a second side wall, wherein a vertical sliding groove is formed in the first side wall, and a sliding block is arranged in the sliding groove;

the offset adjusting device comprises an adjusting block, a motor, a driving gear, a transmission rod, a first driving gear, a second driving gear, a first rack and a second rack;

the first rack and the second rack are respectively arranged on the first side walls on two sides of the sliding groove and are parallel to the sliding groove;

the adjusting block comprises an upper plate, a lower plate, a first side plate and a second side plate, wherein the upper plate and the lower plate are arc panels, the curvature of the lower plate is larger than that of the upper plate, and two ends of the lower plate are respectively and correspondingly fixedly connected with two ends of the upper plate; one side of the upper plate and one side of the lower plate are vertically and fixedly connected with the first side plate, and the other side of the upper plate and the lower plate are vertically and fixedly connected with the second side plate, so that a closed structure is formed;

a first partition plate and a second partition plate which are vertically arranged are arranged in the adjusting block, and through holes for the transmission rod to pass through are formed in the first partition plate and the second partition plate;

the motor, the driving gear, the transmission rod, the first driving gear and the second driving gear are all arranged in the adjusting block, wherein the driving gear, the transmission gear, the first driving gear and the second driving gear are all hollow straight gears; one end of the transmission rod is coaxially and fixedly connected with the central hole of the first driving gear, the other end of the transmission rod is coaxially and fixedly connected with the central hole of the second driving gear after sequentially penetrating through the through hole in the first partition plate, the central hole of the transmission gear and the through hole in the second partition plate, the transmission rod is coaxially and fixedly connected with the transmission gear, and the transmission rod is rotationally connected with the first partition plate and the second partition plate;

the first side plate of the adjusting block is fixedly connected with a sliding block in a sliding groove in the first side wall, so that the adjusting block can freely slide up and down along the sliding groove; the first side plate is provided with a through hole for the first driving gear and the second driving gear to penetrate out;

the motor is fixed in the adjusting block, and an output shaft of the motor is coaxially and fixedly connected with a central hole of the driving gear; the adjusting block is arranged on the adjusting block and is connected with a first gear rack and a second gear rack through a first gear;

when the adjusting block slides to the uppermost end along the sliding groove of the first side wall, the upper plate of the adjusting block is attached to the upper wall surface of the air inlet channel body, and the lower plate is matched with the air inlet channel body to form an S-shaped air inlet channel; when the regulating block slides to the lowest end along the sliding groove of the first side wall, the lower plate of the regulating block is attached to the lower wall surface of the air inlet channel body, and the upper plate is matched with the air inlet channel body to form a linear air inlet channel.

Compared with the prior art, the invention adopting the technical scheme has the following technical effects:

compared with the existing S-shaped air inlet channel, the S-shaped air inlet channel has better compatibility and adaptability, and has the obvious advantage that the advantages of the S-shaped air inlet channel and the straight air inlet channel are combined, so that the S-shaped air inlet channel and the straight air inlet channel simultaneously meet the requirements of lower fuel consumption rate and higher engine thrust during cruising and forward stealth during task execution. Especially for aircraft performing long-endurance missions, the cumulative reduction in fuel consumption is considerable when the aircraft is performing long-endurance cruising or reconnaissance missions.

Drawings

FIG. 1 is a schematic diagram of the operation of the actuator;

FIG. 2 is a view showing the construction of the actuator;

FIG. 3 is a schematic structural view of the actuator adjusting block engaging with the upper wall of the intake duct body;

FIG. 4 is a schematic structural view of the actuator adjusting block engaging with the lower wall of the intake duct body.

In the figure, 1-an air inlet body, 2-an adjusting block, 3-a first rack, 4-a chute, 5-a second rack, 6-a motor, 7-a driving gear, 8-a transmission gear, 9-a transmission rod, 10-a first driving gear and 11-a second driving gear.

Detailed Description

The technical scheme of the invention is further explained in detail by combining the attached drawings:

the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, components are exaggerated for clarity.

As shown in FIG. 1, the invention discloses an aircraft engine air inlet with an adjustable S-bend offset distance, which comprises an air inlet body and an offset distance adjusting device arranged in the air inlet body;

the air inlet channel body comprises an upper wall surface, a lower wall surface, a first side wall and a second side wall, wherein a vertical sliding groove is formed in the first side wall, and a sliding block is arranged in the sliding groove;

the offset adjusting device comprises an adjusting block, a motor, a driving gear, a transmission rod, a first driving gear, a second driving gear, a first rack and a second rack;

the first rack and the second rack are respectively arranged on the first side walls on two sides of the sliding groove and are parallel to the sliding groove;

the adjusting block comprises an upper plate, a lower plate, a first side plate and a second side plate, wherein the upper plate and the lower plate are arc panels, the curvature of the lower plate is larger than that of the upper plate, and two ends of the lower plate are respectively and correspondingly fixedly connected with two ends of the upper plate; one side of the upper plate and one side of the lower plate are vertically and fixedly connected with the first side plate, and the other side of the upper plate and the lower plate are vertically and fixedly connected with the second side plate, so that a closed structure is formed;

a first partition plate and a second partition plate which are vertically arranged are arranged in the adjusting block, and through holes for the transmission rod to pass through are formed in the first partition plate and the second partition plate;

as shown in fig. 2, the motor, the driving gear, the transmission rod, the first driving gear and the second driving gear are all arranged in the adjusting block, wherein the driving gear, the transmission gear, the first driving gear and the second driving gear all adopt hollow straight gears; one end of the transmission rod is coaxially and fixedly connected with the central hole of the first driving gear, the other end of the transmission rod is coaxially and fixedly connected with the central hole of the second driving gear after sequentially penetrating through the through hole in the first partition plate, the central hole of the transmission gear and the through hole in the second partition plate, the transmission rod is coaxially and fixedly connected with the transmission gear, and the transmission rod is rotationally connected with the first partition plate and the second partition plate;

the first side plate of the adjusting block is fixedly connected with a sliding block in a sliding groove in the first side wall, so that the adjusting block can freely slide up and down along the sliding groove; the first side plate is provided with a through hole for the first driving gear and the second driving gear to penetrate out;

the motor is fixed in the adjusting block, and an output shaft of the motor is coaxially and fixedly connected with a central hole of the driving gear; the adjusting block is arranged on the adjusting block and is connected with a first gear rack and a second gear rack through a first gear;

when the adjusting block slides to the uppermost end along the sliding groove of the first side wall, the upper plate of the adjusting block is attached to the upper wall surface of the air inlet channel body, and the lower plate is matched with the air inlet channel body to form an S-shaped air inlet channel, as shown in fig. 3; when the regulating block slides to the lowest end along the sliding groove of the first side wall, the lower plate of the regulating block is attached to the lower wall surface of the air inlet channel body, and the upper plate is matched with the air inlet channel body to form a linear air inlet channel, as shown in fig. 4.

The invention provides an S-bend offset distance adjustable aircraft engine air inlet channel for the situations of reduced total pressure recovery coefficient and enhanced outlet rotational flow distortion caused by an S-shaped air inlet channel.

It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only illustrative of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.