CN204327201U - A kind of sensitive switch interlocking type turbine locking framework of ram-air turbine - Google Patents

Abstract

The utility model designs a micro-switch interlocking turbine locking mechanism of a ram air turbine (abbreviated as RAT). The turbine locking mechanism is mainly composed of shift fork, stop pin, stop ring, micro switch, flexible shaft, lock pin, spring and other parts. The micro-switch interlocking turbine locking mechanism utilizes the movement characteristics of the mechanism to realize the turbo locking and unlocking functions. When the turbo is not locked during the RAT recovery process, the micro-switch is automatically triggered to send a signal to stop the RAT recovery. It is characterized by simple structure and high reliability, which can effectively reduce the workload of ground maintenance of RAT equipment, and at the same time prevent the possibility that the turbine is not locked when the RAT is in recovery state.

Description

A micro-switch interlocking turbine locking mechanism for a ram air turbine

technical field

The Ram Air Turbine (RAT for short) is mainly used in the aircraft emergency power system to provide emergency hydraulic energy or electrical energy for the aircraft. The utility model designs a micro-switch interlocking turbine locking mechanism of a ram air turbine (RAT).

Background technique

RAT is an emergency energy device, which is usually stowed in the RAT cabin and is on standby. When the aircraft is in an emergency state, the ram energy of the airflow is converted into emergency hydraulic energy or emergency electrical energy by throwing the actuator into the airflow. The turbine locking mechanism can lock the turbine of the RAT in the recovery posture, and the turbine is unlocked only after the deployment of the RAT reaches a certain angle during launch. The turbine locking mechanism can effectively reduce the volume of the RAT cabin, save space for aircraft equipment, and at the same time effectively prevent the turbine blades from colliding with the cabin door during the RAT deployment process.

The turbine locking mechanism of RAT currently used in my country is a simple zipper type. Although it can realize the turbo locking and unlocking functions, there are potential safety hazards: when the RAT turbo is not locked, the RAT can still be recovered and cannot be detected visually. Usually, after the RAT is completely recovered in the RAT compartment, it is necessary to manually check whether the turbine can rotate to determine whether the turbine is securely locked. Manual inspection needs to open the ground maintenance cover, which is time-consuming and laborious to operate, and there is also the possibility of missed inspection. If the RAT turbine is not locked in the recovery attitude, the RAT turbine will rotate under vibration, acceleration and other inducements, causing the turbine blades to collide with the RAT cabin, damaging the turbine blades and other equipment in the RAT cabin, and the consequences are disastrous.

Contents of the invention

Design a turbine locking mechanism, which not only has the functions of turbine locking and unlocking, but also has the function of sending a signal in time to stop the RAT recovery action when the turbine is not locked, effectively reducing the workload of RAT ground maintenance and avoiding blade collision accidents due to missed inspections happened.

A micro-switch interlocking turbine locking mechanism of a ram air turbine, which can recover and lock the turbine, unlock the turbine at a fixed deployment angle, and send a recovery suspension signal when the turbine is not locked to realize the recovery suspension of the ram air turbine. The turbine locking mechanism includes a dial Fork, stop pin, stop ring, micro switch, flexible shaft, lock pin and spring, wherein the shift fork is installed on the support arm of the ram air turbine, and the stop ring is sleeved on the support arm of the ram air turbine, which can wrap around the support arm The arm rotates freely; the stop pin and the micro switch are fixed on the frame plate of the ram air turbine, and the installation position of the micro switch can be adjusted by adjusting the fixing nut; the upper end of the flexible shaft is connected with the stop ring, the lower end is connected with the lock pin, and the lock pin is put on the sleeve There is a spring, and the length of the worm lock mechanism is adjusted by adjusting the screw-in length of the lock pin end thread.

The shift fork 1 is installed on the support arm of the ram air turbine through the shoulder screw, and the fork end is sleeved on the cylindrical pin of the stop ring to realize linkage with the stop ring, so that the shift fork can rotate around the shoulder screw.

When the ram air turbine expands to a certain angle, the stop pin prevents the stop ring from moving, the support arm continues to rotate, the flexible shaft pulls the lock pin, and the lock pin is pulled out from the lock pin slot to realize the turbine unlocking function.

When the lock pin is not inserted into the lock pin groove during the recovery process of the ram air turbine, the linkage between the stop ring and the shift fork causes the cam surface of the shift fork to trigger the micro switch, which sends a signal that the turbine is not locked, and stops the operation of the ram air turbine Recycling action.

The turbine locking mechanism designed by the utility model has the function of recovery and suspension. When the turbine is not locked, it can send an electrical signal to the flight controller in time; it can effectively reduce the workload of RAT ground maintenance, and at the same time avoid the occurrence of turbine blade collision failure due to missed inspection.

Description of drawings

FIG. 1 is a schematic diagram of the layout structure on the RAT of the present invention.

Among them, 1—shift fork, 2—stop pin, 3—stop ring, 4—micro switch, 5—flexible shaft, 6—lock pin, 7—spring

Detailed ways

The utility model is described in further detail below in conjunction with the drawings, please refer to accompanying drawing 1.

The micro switch interlocking turbine locking mechanism designed by the utility model comprises a shift fork 1, a stop pin 2, a stop ring 3, a micro switch 4, a flexible shaft 5, a lock pin 6 and a spring 7. The shift fork is installed on the RAT support arm through shoulder screws, and can swing together with the support arm. Its fork end is sleeved on the cylindrical pin of the stop ring, and can be linked with the stop ring. During the linkage process, the shift fork Turn around shoulder screw. The stop ring is sleeved on the RAT support arm and can freely rotate around the support arm. The stop ring is designed with a connection interface with the flexible shaft, a stop surface in contact with the stop pin, and a cylindrical pin linked with the shift fork. The stop pin and the micro switch are fixed on the RAT frame plate, wherein the micro switch can adjust its installation position by adjusting the fixing nut. The upper end of the flexible shaft is connected with the stop ring, and the lower end is connected with the lock pin. The lock pin is covered with a compression spring, and the length of the worm gear locking mechanism can be adjusted by adjusting the screw-in length of the screw thread at the end of the lock pin.

RAT deployment process: In the initial stage, the lock pin, flexible shaft, and stop ring rotate together with the support arm. During this process, the lock pin is kept inserted into the lock pin groove of the turbine under the action of the spring force, and the turbine is in a locked state. After the support arm rotates to a certain angle, the stop ring contacts the stop pin fixed on the frame plate, the stop pin prevents the stop ring from continuing to rotate, the stop ring and the support arm move relative to each other, and the lock pin is released from the turbine lock pin groove. Pull it out to realize the unlocking function of the turbo.

RAT normal recovery process: In the initial stage, the stop ring is kept in contact with the stop pin under the action of the spring force, the stop ring is stationary relative to the frame plate, the shift fork swings with the support arm, and the shift fork and stop ring are linked. Since the locking pin is aligned with the locking pin groove on the turbine shaft, the locking pin is gradually inserted into the locking pin groove under the action of the spring force, thereby realizing the locking function of the turbine. During this process, the shift fork swings together with the support arm, and the stop ring is stationary, causing the shift fork to rotate relative to the shoulder screw, and a certain space can be staggered to effectively avoid the micro switch. When the lock pin is fully inserted into the lock pin slot, the flexible shaft pushes the stop ring, and the stop ring rotates with the support arm until the RAT is fully recovered. RAT abnormal recovery process: In the initial stage, the stop ring is kept in contact with the stop pin under the action of the spring force, the stop ring is stationary relative to the frame plate, the shift fork swings with the support arm, and the shift fork and stop ring are linked. Since the lock pin is not aligned with the lock pin groove on the turbine shaft, when the support arm is retracted to a certain angle, the lock pin pushes against the turbine shaft, and then the flexible shaft will push the stop ring to rotate with the support arm during the recovery process of the support arm. The fork and stop ring rotate as one rigid body with the support arm, so the fork does not rotate around the shoulder screw. When it is recovered to a certain angle, the cam surface of the shift fork is pressed against the micro switch, so that the micro switch triggers and sends an electrical signal to the flight control, so that the RAT recovery is suspended.

Claims (4)

1. the sensitive switch interlocking type turbine locking framework of a ram-air turbine, locking can be reclaimed by turbine, fixing expanded angle turbine unlocks, send during turbine non-locking and reclaim the recovery termination that abort signal realizes ram-air turbine, it is characterized in that: described turbine locking framework comprises shift fork (1), stop pin (2), stop ring (3), sensitive switch (4), flexible axle (5), lock pin (6) and spring (7), wherein shift fork (1) is arranged on the support arm of ram-air turbine, stop ring (3) is enclosed within the support arm of ram-air turbine, freely can rotate around support arm, stop pin (2), sensitive switch (4) are fixed on ram-air turbine deckle board, and sensitive switch (4) can adjust its mounting point by regulating set screw nut, flexible axle (5) upper end connects stop ring (3), lower end connects lock pin (6), the upper cover of lock pin (6) has spring (7), is adjusted the length of turbine locking framework by the screw-in length of adjustment lock pin end screw thread.

2. the sensitive switch interlocking type turbine locking framework of ram-air turbine according to claim 1, it is characterized in that: shift fork (1) is arranged on ram-air turbine support arm by shaft shoulder screw, intersection end is enclosed within the straight pin of stop ring (3), realize, with the interlock of stop ring, shift fork (1) being rotated around shaft shoulder screw.

3. the sensitive switch interlocking type turbine locking framework of ram-air turbine according to claim 1, it is characterized in that: when ram-air turbine is deployed into several angle, stop pin (2) stops stop ring (3) motion, support arm is rotated further, flexible axle (5) pulls lock pin (6), lock pin (6) is extracted from lock pin groove, realizes turbine unlocking function.

4. the sensitive switch interlocking type turbine locking framework of ram-air turbine according to claim 1, it is characterized in that: when in ram-air turbine callback course, lock pin (6) does not insert in lock pin groove, interlock between stop ring (3) and shift fork (1) causes the camming surface of shift fork (1) to trigger sensitive switch (4), send the not locked signal of turbine, stop the recovery action of ram-air turbine.