Pressure-adjustable single-nozzle emergency release actuator cylinder and emergency release method

Abstract

The invention belongs to the field of aircraft structure design, and particularly relates to a pressure-adjustable single-nozzle emergency release actuator cylinder and an emergency release method, the pressure-adjustable single-nozzle emergency release actuator cylinder comprises a nozzle, a pressurizing valve, an end cover, an outer cylinder, a reset spring and a piston rod; one end of the outer cylinder is connected with the piston rod, the other end of the outer cylinder is connected with the end cover, and the pipe nozzle and the pressurizing valve are arranged at one end of the outer cylinder; the reset spring is connected between the piston rod and the outer cylinder; a rodless cavity is formed among the end part of the piston rod, the outer cylinder and the end cover, and the pressurizing valve is communicated with the rodless cavity; a rod cavity is arranged between the piston rod and the outer cylinder, and the pipe nozzle is communicated with the rod cavity. Due to the fact that the inflation valve is arranged outside the rodless cavity of the outer cylinder, the use space during arrangement of a hydraulic pipeline is reduced, the weight of the arranged pipeline is reduced, the whole cost is reduced, in addition, the inflation valve can adjust pressure to meet the reset requirement of the actuator cylinder under the condition that the spring force value is not enough, and the inflation valve is arranged to facilitate subsequent cleaning of the interior of the rodless cavity.

Description

Technical Field

[0001] This application belongs to the field of aircraft structural design, and specifically relates to an adjustable pressure single-nozzle emergency release actuator and emergency release method. Background Technology

[0002] Currently, landing gear emergency release actuators typically employ a two-nozzle configuration to provide unlocking force during emergency release. During unlocking, one nozzle is supplied with normal pressure, while the other is supplied with return oil, thereby unlocking the upper landing gear lock. However, this type of actuator requires two hydraulic lines to connect to the emergency release actuator, increasing the complexity of the layout, the space occupied, and the weight of the entire system.

[0003] Furthermore, when the landing gear emergency release actuator uses the rodless chamber for pressure release to unlock, the actuator can be configured with a differential mechanism to meet the unlocking requirements and can accommodate an actuator design with a nozzle. However, if the actuator is designed to use the rod chamber for unlocking, the differential mechanism cannot meet the requirement of having a nozzle in the actuator.

[0004] Therefore, how to design an emergency release actuator with a rodless cavity is a problem that needs to be solved. Summary of the Invention

[0005] To address the aforementioned issues, this application provides an adjustable pressure single-nozzle emergency release actuator and emergency release method, thereby resolving the problem of difficulty in designing actuators with rodless chambers in the prior art.

[0006] The technical solution of this application is: an adjustable pressure single-nozzle emergency release actuator, including a nozzle, a pressurization valve, an end cap, an outer cylinder, a return spring, and a piston rod;

[0007] One end of the outer cylinder is connected to the piston rod, and the other end is connected to the end cap. The nozzle is located at one end of the outer cylinder, and the pressurization valve is located at the other end of the outer cylinder. The return spring is connected between the piston rod and the outer cylinder.

[0008] A rodless cavity is formed between the piston rod end, the outer cylinder, and the end cap, and the pressure valve is connected to the rodless cavity; a rod cavity is provided between the piston rod and the outer cylinder, and the nozzle is connected to the rod cavity.

[0009] Preferably, a piston is provided at one end of the piston rod located inside the outer cylinder, and the piston slides in contact with the inner wall of the outer cylinder.

[0010] Preferably, the piston of the piston rod is made of a metal component.

[0011] Preferably, a sealing ring is provided between the piston and the outer cylinder of the piston rod.

[0012] Preferably, the end cap is threadedly connected to the outer cylinder, and a stop sleeve is provided on the inner wall of the end cap, which can block the end of the piston rod.

[0013] Preferably, the middle part of the piston rod is in sliding engagement with the outer cylinder.

[0014] Preferably, a sealing ring is provided at the position of the outer cylinder corresponding to the piston rod.

[0015] Preferably, a hydraulic oil groove is provided at the end of the piston near the nozzle, so that the hydraulic oil flowing in from the nozzle can enter the hydraulic oil groove.

[0016] Another technical solution of this application is: an adjustable pressure single-nozzle emergency release method, comprising:

[0017] When the emergency release actuator retracts:

[0018] Emergency hydraulic system pressure supply;

[0019] The oil flows into the rod chamber of the outer cylinder through the nozzle;

[0020] The oil pushes the piston on the piston rod to retract;

[0021] When the piston rod retracts, the spring is compressed, and the gas pressure inside the rodless chamber of the outer cylinder increases from small to large until it contacts the stop sleeve and stops.

[0022] The landing gear upper lock or strut lock has been unlocked.

[0023] Preferably, when the emergency release actuator performs the extension action:

[0024] Emergency hydraulic system depressurization;

[0025] The return spring and the pressure inside the rodless cavity of the outer cylinder work together to overcome the return oil pressure and frictional elongation in the rod cavity.

[0026] The extension of the return spring and the decrease in pressure within the rodless cavity of the outer cylinder together push the piston rod to extend to the end.

[0027] The piston rod and return spring extend, and the actuator cylinder returns to its original position.

[0028] The adjustable pressure single-nozzle emergency release actuator and emergency release method of this application have the following advantages:

[0029] The use of an air valve on the outside of the rodless chamber of the outer cylinder reduces the space required for hydraulic pipeline layout, lightens the weight of the pipeline, and lowers the overall cost. In addition, the air valve can be pressure adjusted to meet the reset requirements of the actuator cylinder when the spring force is insufficient. Furthermore, the air valve facilitates subsequent cleaning of the inside of the rodless chamber. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of this application.

[0031] 1. Nozzle; 2. Inflation valve; 3. End cap; 4. Stop sleeve; 5. Outer cylinder; 6. Return spring; 7. Piston rod. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, not all, of the embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0033] The first aspect of this application provides an adjustable pressure single-nozzle emergency release actuator, including a nozzle 1, an inflation valve 2, an end cap 3, an outer cylinder 5, a return spring 6, and a piston rod 7;

[0034] One end of the outer cylinder 5 is connected to the piston rod 7, and the other end is connected to the end cap 3. The nozzle 1 is located at one end of the outer cylinder 5, and the inflation valve 2 is located at the other end of the outer cylinder 5. The return spring 6 is connected between the piston rod 7 and the outer cylinder 5.

[0035] A rodless cavity is formed between the end of the piston rod 7, the outer cylinder 5, and the end cap 3, and the inflation valve 2 is connected to the rodless cavity; a rod cavity is provided between the piston rod 7 and the outer cylinder 5, and the nozzle 1 is connected to the rod cavity.

[0036] The rod chamber of the emergency release actuator is equipped with a single nozzle 1, and the rodless chamber is equipped with an inflation valve 2. The exposed part of the piston rod 7 is equipped with a return spring 6. After the rod chamber of the actuator is compressed and short-circuited, the piston rod 7 is extended and returned to its original position by relying on the external spring and gas pressure.

[0037] When the emergency release actuator is needed to unlock the landing gear upper lock or strut lock, the hydraulic system pressurizes the emergency release actuator, causing the actuator piston rod 7 to retract and the landing gear strut lock to unlock, thus lowering the landing gear. After unlocking the landing gear upper lock or strut lock, the hydraulic actuator is depressurized, and the actuator, relying on the spring and the pressure of the internal air chamber, resets the piston rod 7, returning the emergency release actuator to its initial state.

[0038] This actuator design achieves the same function as previous dual-chamber actuators while reducing the number of nozzles (1) in the piping, thus reducing the space occupied by the piping and lightening the overall weight of the hydraulic system. It also meets the requirements for actuator design when spring placement is limited or the force value cannot meet the requirements.

[0039] The inflation valve 2 is normally closed, but is opened in case of oil leakage to replenish hydraulic oil.

[0040] Preferably, a piston is provided at one end of the piston rod 7 located inside the outer cylinder 5, and the piston slides in contact with the inner wall of the outer cylinder 5.

[0041] Preferably, the end is made of an elastic element.

[0042] Preferably, a sealing ring is provided between the piston of the piston rod 7 and the outer cylinder 5 to reduce hydraulic oil leakage.

[0043] Preferably, the end cap 3 is threadedly connected to the outer cylinder 5, and a stop sleeve 4 is provided on the inner wall of the end cap 3, which can block the end of the piston rod 7. When the piston rod 7 moves toward the end cap 3, since the inflation valve 2 is in a closed state, the pressure inside the rodless chamber gradually increases. When it reaches the position of the stop sleeve 4, it can reach the set pressure value, thereby effectively controlling the pressure inside the rodless chamber.

[0044] Preferably, the middle part of the piston rod 7 is in sliding fit with the outer cylinder 5.

[0045] Preferably, a sealing ring is provided at the position of the outer cylinder 5 corresponding to the piston rod 7.

[0046] Preferably, a hydraulic oil groove is provided at the end of the piston near the nozzle 1, so that the hydraulic oil flowing from the nozzle 1 can enter the hydraulic oil groove, allowing the oil in the nozzle 1 to smoothly enter the rod chamber.

[0047] As another specific implementation method, an adjustable pressure single-nozzle emergency release method includes:

[0048] When the emergency release actuator retracts:

[0049] Emergency hydraulic system pressure supply;

[0050] The oil flows into the rod chamber of the outer cylinder 5 through nozzle 1;

[0051] The oil pushes the piston on piston rod 7 to retract;

[0052] When the piston rod 7 retracts, the spring is compressed, and the gas pressure in the rodless chamber of the outer cylinder 5 increases from small to large until it contacts the stop sleeve 4 and stops.

[0053] The landing gear upper lock or strut lock has been unlocked.

[0054] Preferably, when the emergency release actuator performs the extension action:

[0055] Emergency hydraulic system depressurization;

[0056] The return spring 6 and the inner cavity pressure of the rodless chamber of the outer cylinder 5 work together to overcome the return oil pressure of the rod chamber and the elongation due to friction.

[0057] The extension of the return spring 6 and the decrease in pressure within the rodless cavity of the outer cylinder 5 together push the piston rod 7 to extend to the end.

[0058] The piston rod 7 and the return spring 6 extend, and the actuator cylinder returns to its original position.

[0059] In summary, this application has the following advantages:

[0060] The use of an air valve on the outside of the rodless chamber of the outer cylinder reduces the space required for hydraulic pipeline layout, lightens the weight of the pipeline, and lowers the overall cost. In addition, the air valve can be pressure adjusted to meet the reset requirements of the actuator cylinder when the spring force is insufficient. Furthermore, the air valve facilitates subsequent cleaning of the inside of the rodless chamber.

[0061] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An adjustable pressure single-nozzle emergency release actuator, characterized in that, It includes a nozzle (1), an inflation valve (2), an end cap (3), an outer cylinder (5), a return spring (6), and a piston rod (7); One end of the outer cylinder (5) is connected to the piston rod (7) and the other end is connected to the end cap (3). The nozzle (1) is located at one end of the outer cylinder (5) and the inflation valve (2) is located at the other end of the outer cylinder (5). The return spring (6) is connected between the piston rod (7) and the outer cylinder (5). A rodless cavity is formed between the end of the piston rod (7), the outer cylinder (5), and the end cap (3), and the inflation valve (2) is connected to the rodless cavity; a rod cavity is provided between the piston rod (7) and the outer cylinder (5), and the nozzle (1) is connected to the rod cavity.

2. The adjustable pressure single-nozzle emergency release actuator as described in claim 1, characterized in that, The piston rod (7) is provided with a piston at one end inside the outer cylinder (5), and the piston slides in contact with the inner wall of the outer cylinder (5).

3. The adjustable pressure single-nozzle emergency release actuator as described in claim 2, characterized in that, The piston of the piston rod (7) is made of metal components.

4. The adjustable pressure single-nozzle emergency release actuator as described in claim 3, characterized in that, A sealing ring is provided between the piston of the piston rod (7) and the outer cylinder (5).

5. The adjustable pressure single-nozzle emergency release actuator as described in claim 2, characterized in that, The end cap (3) is threadedly connected to the outer cylinder (5). The inner wall of the end cap (3) is provided with a stop sleeve (4), which can block the end of the piston rod (7).

6. The adjustable pressure single-nozzle emergency release actuator as described in claim 2, characterized in that, The piston rod (7) is in sliding fit with the outer cylinder (5) at its middle part.

7. The adjustable pressure single-nozzle emergency release actuator as described in claim 6, characterized in that, A sealing ring is provided at the position of the outer cylinder (5) corresponding to the piston rod (7).

8. The adjustable pressure single-nozzle emergency release actuator as described in claim 2, characterized in that, A hydraulic oil groove is provided at one end of the piston near the nozzle (1), and the hydraulic oil flowing in from the nozzle (1) can enter the hydraulic oil groove.

9. An adjustable pressure single-nozzle emergency release method, employing the actuating cylinder as described in any one of claims 1-8, characterized in that, include: When the emergency release actuator retracts: Emergency hydraulic system pressure supply; The oil flows into the rod chamber of the outer cylinder (5) through the nozzle (1); The oil pushes the piston on the piston rod (7) to retract; When the piston rod (7) retracts, the spring is compressed, and the gas pressure in the rodless chamber of the outer cylinder (5) increases from small to large until it contacts the stop sleeve (4) and stops. The landing gear upper lock or strut lock has been unlocked.

10. The adjustable pressure single-nozzle emergency release method as described in claim 9, characterized in that, When the emergency release actuator extends: Emergency hydraulic system depressurization; The return spring (6) and the rodless cavity pressure of the outer cylinder (5) together overcome the return oil pressure and friction force of the rod cavity to elongate; The extension of the return spring (6) and the decrease in pressure in the rodless cavity of the outer cylinder (5) together push the piston rod (7) to extend to the end; The piston rod (7) and the return spring (6) extend, and the actuator cylinder returns to its original position.

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