阅读说明：本技术 一种航空发动机风扇转速测量装置 (Aircraft engine fan rotational speed measuring device ) 是由 石云飞 李俊励 熊珊 冀国锋 杨加寿 吴秀宽 孙瑛聪 莫鹏 于佳 李旭 李升东 于 2021-08-17 设计创作，主要内容包括：本发明公开了一种航空发动机风扇转速测量装置,包括：壳体,壳体小端部上有与风扇整流帽罩相连的安装接口A；壳体大端周向间隔有用于与发动机风扇静子连接的六个安装接口B；通过安装接口A与风扇整流帽罩相连,以及安装接口B与发动机风扇静子相连,使得整个测量装置被固定；壳体的大端上有通孔分别来固定嵌入电磁脉冲式的转速传感器,转速传感器上有输出接口,用来连接信号处理系统；壳体大端轴向可旋转稳定同轴安装有传动轴,传动轴外端形成用于与风扇转子相连的输入接口C,信号盘紧套在传动轴上；信号盘有多个周向均布沿轴向的齿,齿的位置正对转速传感器的感应端。(The invention discloses a device for measuring the rotating speed of a fan of an aircraft engine, which comprises: the small end part of the shell is provided with an installation interface A connected with a fan rectification cap cover; six mounting interfaces B used for being connected with a fan stator of an engine are circumferentially arranged at intervals at the large end of the shell; the whole measuring device is fixed by connecting the mounting interface A with a fan fairing and connecting the mounting interface B with a fan stator of an engine; the large end of the shell is provided with through holes for respectively fixing and embedding an electromagnetic pulse type rotating speed sensor, and the rotating speed sensor is provided with an output interface for connecting a signal processing system; the large end of the shell is axially, rotatably, stably and coaxially provided with a transmission shaft, the outer end of the transmission shaft forms an input interface C for connecting with a fan rotor, and a signal panel is tightly sleeved on the transmission shaft; the signal panel has a plurality of circumference equipartition along axial tooth, and the position of tooth is just to revolution speed sensor's induction end.)

1. An aircraft engine fan speed measurement device, comprising:

the fan rectifying hood comprises a shell (2), wherein a mounting interface A connected with a fan rectifying hood is arranged at the small end part of the shell (2);

six mounting interfaces B used for being connected with a fan stator of an engine are circumferentially arranged at intervals at the large end of the shell (2); the whole measuring device is fixed by connecting the mounting interface A with a fan fairing and connecting the mounting interface B with a fan stator of an engine;

the big end of the shell (2) is provided with through holes for respectively fixing and embedding an electromagnetic pulse type rotating speed sensor (3), and the rotating speed sensor (3) is provided with an output interface for connecting a signal processing system;

a transmission shaft (12) is axially, rotatably, stably and coaxially arranged at the large end of the shell (2), an input interface C used for being connected with a fan rotor is formed at the outer end of the transmission shaft (12), and a signal panel (8) is tightly sleeved on the transmission shaft (12);

the signal panel (8) is provided with a plurality of teeth which are circumferentially and uniformly distributed along the axial direction, and the positions of the teeth are just opposite to the sensing end of the rotating speed sensor (3).

2. An aircraft engine fan speed measurement device as claimed in claim 1, wherein: a sealing ring A (6) is sleeved outside the rotating speed sensor (3) and is in sealing contact with the shell (2), and the sealing ring A (6) is used for sealing to prevent the matching surface of the rotating speed sensor (3) and the shell (2) from leaking oil and gas.

3. An aircraft engine fan speed measurement device as claimed in claim 1, wherein: the rotating speed sensor (3) is sleeved with an adjusting washer (5) for adjusting the contact distance with the end face of the shell (2); the end of the rotating speed sensor (3) is covered with a cover plate (4), and the cover plate (4), the rotating speed sensor (3) and the adjusting washer (5) are screwed and pressed on the end face of the shell (2) through a stud A (19) and a nut A (20).

4. An aircraft engine fan speed measurement device as claimed in claim 3, wherein: the end part, close to the shell (2), of the signal disc (8) is sleeved with a ball bearing A (101), the ball bearing A (101) is installed in a bearing seat (9), the bearing seat (9) is obliquely, penetrating, positioned and fixed on the shell (2) through three positioning pins A (16) which are distributed at intervals, and the oblique positioning pins A (16) can ensure that the position of the bearing seat (9) cannot be displaced axially and radially;

the end part, close to the transmission shaft (1), of the signal disc (8) is sleeved with a ball bearing B (102), the outer ring of the ball bearing B (102) is matched with a support (7) to obtain support, the support (7) is positioned with the shell (2) through a positioning pin B (15), and the support (7) is fixedly connected with the shell (2) through a stud B (17) and a nut B (18);

the ball bearing A (101) can stably rotate in the bearing seat (9), and the transmission shaft (12) can drive the signal disc (8) to rotate around the ball bearing B (102) and is always coaxial and stable with the axis of the shell (2).

5. An aircraft engine fan speed measurement device as claimed in claim 4, wherein: and a retainer ring (13) and a washer (14) are arranged between the support (7) and the signal disc (8), the retainer ring (13) is used for blocking the ball bearing B (102), and the washer (14) is used for adjusting a gap between the ball bearing B (102) and the retainer ring (13).

6. An aircraft engine fan speed measurement device as claimed in claim 1, wherein: the small end of the shell (2) is screwed with a screw sleeve (1) to form a mounting interface A connected with the fan fairing.

7. An aircraft engine fan speed measurement device as claimed in claim 1, wherein: six through holes are formed in the circumferential direction of the large end of the shell (2) at intervals to form six installation interfaces B.

8. An aircraft engine fan speed measurement device as claimed in claim 1, wherein: the number of the rotating speed sensors (3) is three.

9. An aircraft engine fan speed measurement device as claimed in claim 1, wherein: the housing (2) is made of a ZM (6) alloy having a low density.

10. An aircraft engine fan speed measurement device as claimed in claim 1, wherein: the signal disc (8) is tightly sleeved on the transmission shaft (12) through a spline and a sealing ring B (11).

Technical Field

The invention relates to a device for measuring the rotating speed of a fan of an aircraft engine, and belongs to the technical field of rotating speed measuring devices.

Background

In the working process of an aircraft engine, in order to accurately know the working state of the engine, various parameters of the engine, such as air pressure, temperature, rotating speed, vibration and the like, need to be measured, wherein the rotating speed of an engine rotor is one of important parameters reflecting the working state of the engine, and different rotating speeds correspond to different working states of the engine. In order to accurately grasp the working state of the engine, the rotating speed of the rotor of the aircraft engine needs to be measured and monitored in real time; the electromagnetic pulse type measurement is one of common methods for measuring the rotating speed, and the core of the method is that an electromagnetic pulse type rotating speed sensor is over against a gear disc, an induction coil is arranged in the sensor to form a magnetic field, when the gear disc rotates, disc teeth cut the magnetic field to generate a magnetic induction phenomenon, the coil in the sensor generates alternating voltage to output a pulse signal, the frequency of the pulse signal is in direct proportion to the rotating speed of the gear disc, and the rotating speed can be obtained by calculating the frequency of the pulse signal and the number of teeth of the gear disc.

The prior art is as follows: although the device for measuring the rotating speed of the rotor of the aircraft engine disclosed in the chinese patent publication No. CN104793007A can be installed on a booster pump of a fuel control system of the aircraft engine to measure the rotating speed of the rotor of the engine, when the rotating speed of the fan of the engine is measured, it is difficult to ensure the coaxial stability of the rotation of the measuring device after installation when in use, and there is a problem that the rotating speed of the fan of the engine is difficult to be accurately measured by the conventional rotating speed measuring device.

Disclosure of Invention

In order to solve the technical problem, the invention provides a device for measuring the rotating speed of a fan of an aircraft engine.

The invention is realized by the following technical scheme.

The invention provides a device for measuring the rotating speed of an aircraft engine fan, which comprises:

the small end part of the shell is provided with an installation interface A connected with a fan rectification cap cover;

six mounting interfaces B used for being connected with a fan stator of an engine are circumferentially arranged at intervals at the large end of the shell; the whole measuring device is fixed by connecting the mounting interface A with a fan fairing and connecting the mounting interface B with a fan stator of an engine;

the large end of the shell is provided with through holes for respectively fixing and embedding an electromagnetic pulse type rotating speed sensor, and the rotating speed sensor is provided with an output interface for connecting a signal processing system;

the large end of the shell is axially, rotatably, stably and coaxially provided with a transmission shaft, the outer end of the transmission shaft forms an input interface C for connecting with a fan rotor, and a signal panel is tightly sleeved on the transmission shaft;

the signal panel has a plurality of circumference equipartition along axial tooth, and the position of tooth is just to revolution speed sensor's induction end.

Installation interface A on the casing links to each other with fan fairing, the installation interface B of casing links to each other with engine fan stator, make whole measuring device stabilize fixedly, input interface C links to each other with fan rotor, engine during operation fan rotor is rotatory, the transmission shaft drives the relative casing of signal disc and stabilizes coaxial rotation, tooth cutting speed sensor's on the signal disc magnetic field produces accurate alternating voltage data, the pulse signal data of alternating voltage is exported through speed sensor's output interface, and then the analysis obtains accurate fan rotor rotational speed by the number of teeth of pulse signal frequency and signal disc, the problem of current rotational speed measuring device hardly accurate carrying out the measurement to engine fan rotational speed has been solved.

The rotating speed sensor is sleeved with a sealing ring A to be in sealing contact with the shell, and the sealing ring A is used for sealing to prevent the rotating speed sensor from leaking oil and gas from the matching surface of the rotating speed sensor and the shell.

The rotating speed sensor is sleeved with an adjusting washer, and the contact distance between the rotating speed sensor and the end face of the shell is adjusted to adjust the spacing distance between the rotating speed sensor and the signal panel; the end cover of the rotation speed sensor is provided with a cover plate, and the cover plate, the rotation speed sensor and the adjusting washer are screwed and pressed on the end surface of the shell through a stud A and a nut A.

The end part of the signal panel close to the shell is sleeved with a ball bearing A, the ball bearing A is arranged in a bearing seat, the bearing seat is obliquely penetrated, positioned and fixed on the shell through three positioning pins A which are distributed at intervals, and the oblique positioning pins A can ensure that the position of the bearing seat cannot be displaced axially and radially;

the end part of the signal panel close to the transmission shaft is sleeved with a ball bearing B, the outer ring of the ball bearing B is matched with a support to obtain support, the support is positioned with the shell by a positioning pin B, and the support is fixedly connected with the shell through a stud B and a nut B;

the ball bearing A can stably rotate in the bearing seat, and the transmission shaft can drive the signal coil to rotate around the ball bearing B and is always coaxial and stable with the axis of the shell.

And a retainer ring and a gasket are arranged between the support and the signal panel, the retainer ring is used for blocking the ball bearing B, and the gasket is used for adjusting the gap between the ball bearing B and the retainer ring.

The housing is made of a ZM alloy having a relatively low density.

The small end of the shell is screwed with a thread sleeve to form an installation interface A connected with the fan fairing cap cover, and the installation interface A formed by the thread sleeve is used for bearing abrasion to be borne by the low hardness of the shell.

Six through holes are formed in the circumferential direction of the large end of the shell at intervals to form six installation interfaces B for being connected with a fan stator of an engine.

The number of the revolution speed sensors is three, the three revolution speed sensors ensure the correctness of the measurement result, and meanwhile, the three revolution speed sensors are mutually backed up to ensure that the rest revolution speed sensors still have revolution speed signals to output when one revolution speed sensor is damaged or a circuit is damaged.

The signal disc is tightly sleeved on the transmission shaft through a spline and a sealing ring B.

The invention has the beneficial effects that: the mounting interface A is connected with the fan fairing hood and is connected with the fan stator through a mounting interface B on the shell, and the mounting interface A and the mounting interface B play a role in fixing the rotating speed measuring device; the fan rotor is connected with the fan rotor through an input interface C on the transmission shaft, when the engine works, the fan rotor rotates, a spline transmission torque through the input interface C drives the transmission shaft to rotate, the transmission shaft is connected with a spline of a signal disc through the spline, the signal disc is driven to rotate, when the signal disc rotates, a bearing seat is fixed on a shell in a penetrating mode through a positioning pin A fixed in inclined positioning mode, a ball bearing A rotates stably in the bearing seat, the transmission shaft can drive the signal disc to rotate around a ball bearing B and is coaxial with the axis of the shell all the time stably, a tooth on the rotating signal disc cuts a magnetic field of a rotating speed sensor of an electromagnetic pulse type, stable and accurate alternating voltage is generated, pulse signal data of the alternating voltage is output through an output interface of the rotating speed sensor, and the rotating speed of the fan rotor is obtained through the number of teeth of the pulse signal frequency and the signal disc and then through analysis.

Drawings

FIG. 1 is a schematic diagram of the right-view structure of the present invention;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is a left side view of FIG. 2;

FIG. 4 is a schematic diagram of a front view cross section structure of a signal panel

In the figure: 1-thread bushing; 2-a shell; 3-a rotation speed sensor; 4-cover plate; 5-adjusting the gasket; 6-sealing ring A; 7-support; 8-signal panel; 9-bearing seats; 101-ball bearing A; 102-ball bearing B; 11-sealing ring B; 12-a drive shaft; 13-a retainer ring; 14-a gasket; 15-positioning pin B; 16-positioning pin A; 17-stud B; 18-nut B; 19-stud a; 20-nut a.

Detailed Description

The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.

See fig. 1-4.

The invention relates to a device for measuring the rotating speed of a fan of an aircraft engine, which comprises:

a housing 2 for mounting a revolution speed sensor 3, the housing 2 being made of a ZM6 alloy having a low density in order to reduce the weight of the housing 2 to ensure the weight of the engine for the whole test;

the small end of the left part of the shell 2 is screwed with the screw sleeve 1 to form an installation interface A connected with the fan fairing cap, and the installation interface A formed by the internal thread of the screw sleeve 1 bears the abrasion to be born by the low hardness of the shell 2;

six through holes are circumferentially arranged at intervals at the large end of the right end of the shell 2 to form six mounting interfaces B for connecting with a fan stator of an engine; the whole measuring device is fixed by connecting the mounting interface A with a fan fairing and connecting the mounting interface B with a fan stator of an engine;

the big end of the shell 2 is provided with a through hole for respectively fixing and embedding three electromagnetic pulse type rotating speed sensors 3, the three rotating speed sensors 3 ensure the correctness of the measuring result, and meanwhile, the three rotating speed sensors 3 are mutually backup to ensure that the other rotating speed sensors 3 still have rotating speed signal output when one rotating speed sensor is damaged or a circuit is damaged; the rotating speed sensor 3 is provided with an output interface for connecting a signal processing system;

a transmission shaft 12 is axially, rotatably, stably and coaxially arranged at the large end of the shell 2, an input interface C used for being connected with a fan rotor is formed at the outer end of the right side of the transmission shaft 12, and a signal disc 8 is tightly sleeved on the transmission shaft 12 through a spline and a sealing ring B11;

the signal panel 8 is provided with a plurality of teeth which are uniformly distributed along the axial direction in the circumferential direction, and the positions of the teeth are just opposite to the induction end of the rotating speed sensor 3.

Installation interface A on casing 2 links to each other with fan fairing, the installation interface B of casing 2 links to each other with the engine fan stator, make whole measuring device stabilize fixedly, input interface C links to each other with fan rotor, engine during operation fan rotor is rotatory, transmission shaft 12 drives the stable coaxial rotation of casing 2 relative to signal disc 8, tooth cutting speed sensor 3's on the signal disc magnetic field produces accurate alternating voltage data, the pulse signal data of alternating voltage is exported through speed sensor 3's output interface, and then the analysis obtains accurate fan rotor rotational speed by the number of teeth of pulse signal frequency and signal disc 8, the problem of current rotational speed measuring device hardly accurate carrying out the measurement to engine fan rotational speed has been solved.

A sealing ring A6 is sleeved outside the rotation speed sensor 3 and is in sealing contact with the shell 2, and the sealing ring A6 is used for sealing and preventing the matching surface of the rotation speed sensor 3 and the shell 2 from oil leakage and air leakage; the rotating speed sensor 3 is sleeved with an adjusting washer 5, and the contact distance between the rotating speed sensor 3 and the end face of the shell 2 is adjusted to adjust the spacing distance between the rotating speed sensor 3 and the signal panel 8; the end of the rotation speed sensor 3 is covered with a cover plate 4, and the cover plate 4, the rotation speed sensor 3 and an adjusting washer 5 are screwed and pressed on the end surface of the shell 2 through a stud A19 and a nut A20.

The end part, close to the shell 2, of the signal disc 8 is sleeved with a ball bearing A101, the ball bearing A101 is installed in a bearing seat 9, the bearing seat 9 is obliquely, penetratingly, positioned and fixed on the shell 2 through three positioning pins A16 which are distributed at intervals, and the oblique positioning pin A16 can ensure that the position of the bearing seat 9 cannot be displaced axially and radially;

the end part, close to the transmission shaft 1, of the signal disc 8 is sleeved with a ball bearing B102, the outer ring of the ball bearing B102 is matched with a support 7 to obtain support, the support 7 is positioned with the shell 2 by a positioning pin B15, and the support 7 is fixedly connected with the shell 2 through a stud B17 and a nut B18;

the ball bearing A101 can stably rotate in the bearing seat 9, and the transmission shaft 12 can drive the signal disc 8 to rotate around the ball bearing B102 and is always coaxial and stable with the axis of the shell 2.

A retainer ring 13 and a washer 14 are arranged between the support 7 and the signal disc 8, the retainer ring 13 is used for retaining the ball bearing B102, and the washer 14 is used for adjusting the clearance between the ball bearing B102 and the retainer ring 13.

The fan rotating speed measuring device is independently a module, the module is connected with a fan fairing through an installation interface A on a shell 2 and is connected with a fan stator through an installation interface B on the shell 2, and the installation interface A and the installation interface B play a role in fixing the rotating speed measuring device; the fan rotor is connected with the input interface C on the transmission shaft 12, and the rotating speed of the fan rotor is input; and the output interface of the sensor 3 is connected with a signal processing system to output the pulse signal data of the alternating voltage.

The engine during operation, the fan rotor is rotatory, it is rotatory to pass to turn round through input interface C's spline and drive transmission shaft 12, transmission shaft 12 is again through the splined connection with signal disc 8, it is rotatory to drive signal disc 8, when signal disc 8 is rotatory, because bearing frame 9 is run through the location by the fixed locating pin A16 of slope location and is fixed on casing 2, make ball bearing A101 at bearing frame 9 internal stability rotatory, transmission shaft 12 can drive signal disc 8 around ball bearing B102 when rotatory all the time with the coaxial steady rotation of casing 2 axis, the tooth on the rotatory signal disc 8 cuts electromagnetic impulse type's speed sensor 3's magnetic field, produce stable accurate alternating voltage, output alternating voltage's pulse signal data through speed sensor 3, and then the analysis obtains fan rotor rotational speed by the number of teeth of pulse signal frequency and signal disc 8.

The invention is not limited to the measurement of the rotating speed of the fan rotor, and can also be used in other rotating speed measurement scenes. If interface A is not required, the bushing 1 can be eliminated and the rotational speed sensor housing 2 can be adapted.