An energy conversion valve for use in a landing gear retraction system

Abstract

The present application belongs to the field of landing gear design of aviation technology, and relates to an energy conversion valve used in a landing gear retraction system. When the main system is normally working, the pilot electromagnetic valve in the energy conversion valve is not powered, the energy conversion valve is in the main system working position, at this time, the load subsystem communicates with the main system and is isolated from the standby system, and the landing gear door / landing gear actuator is normally retracted; when the main system has a fault, the standby system supplies pressure, the pilot electromagnetic valve of the energy conversion valve is powered, the load subsystem communicates with the standby system and is isolated from the main system, and the landing gear door / landing gear actuator is in emergency release; the valve core has reliable isolation between the two positions, and a single function failure does not leak to another system.

Description

Technical Field

[0001] This invention belongs to the field of landing gear design in aviation technology, and relates to an energy conversion valve used in a landing gear retraction system. It is used to install in a landing gear system with two pressure supply systems (main pressure supply system and backup pressure supply system). When a conversion signal is received, the hydraulic energy conversion valve switches the pressure supply system. Background Technology

[0002] In the landing gear retraction system, there is a single point of failure where the landing gear door cannot be opened when the landing gear is stuck in the retracted position. In the event of this failure, adaptive and coordinated changes are required in multiple areas, including structure, electrical, and systems, resulting in numerous coordination issues and a long changeover period. Summary of the Invention

[0003] Purpose of the invention: To provide an energy conversion valve for a landing gear retraction system, which avoids the simultaneous failure of two systems due to a single point of failure and oil leakage between the two pressure supply systems.

[0004] Technical solution:

[0005] An energy conversion valve used in a landing gear retraction system includes: a housing, a valve core 5, a valve sleeve 6, and a pilot solenoid valve. The housing is provided with interfaces TA, TB, CB, CA, P2, R2, and R1. The right side of the valve core is connected to the control chamber of the pilot solenoid valve, and the left side of the valve core is connected to a return spring.

[0006] The inner cavity of the housing is divided into a main hydraulic system cavity and a backup hydraulic system cavity. The valve core 5 is provided with an isolation shoulder 5-a in the middle section to isolate the main hydraulic system and the backup hydraulic system. The isolation shoulder 5-a is provided with a first covering shoulder 5-c and a second covering shoulder 5-b on both sides to achieve oil inlet and outlet isolation between the single systems.

[0007] The valve core 5 has a first oil passage 5-i and a second oil passage 5-l inside. The isolation shoulder has a first isolation ring groove 5-e and a second isolation ring groove 5-f. The first oil passage 5-i is connected to the first isolation ring groove 5-e, and the second isolation ring groove 5-f is connected to the second oil passage 5-l. A process plug is provided at the end of the second oil passage 5-l. The first covering shoulder 5-c is provided with a covering ring groove 5-h.

[0008] The first isolation ring groove 5-e is connected to the return oil of the main hydraulic system through the first oil passage 5-i, and the second isolation ring groove 5-f is connected to the cover ring groove 5-h through the second oil passage 5-l.

[0009] Furthermore, the valve sleeve 6 is provided with a pressure relief hole, which is connected to the return oil of each system through the oil passage hole of the valve body.

[0010] Furthermore, the pilot control valve is a normally closed control valve.

[0011] Furthermore, interfaces TA and TB are located on the first side of the housing for supplying pressure to the main hydraulic system, while interfaces P2 and R2 are located on the second side of the housing for supplying pressure to the backup hydraulic system. The first side and the second side are opposite to each other.

[0012] Furthermore, interfaces CB and CA are located on the third side of the housing, which is adjacent to the first side.

[0013] Furthermore, a spherical filter screen is integrated on the pilot solenoid valve.

[0014] Furthermore, when the valve core is in operation of the main hydraulic system, the left side of the valve core is subjected to the preload force of the main hydraulic system's reset spring, while the right side of the valve core is connected to the control chamber of the pilot control valve, and the control pressure of the pilot control valve is taken from the backup hydraulic system.

[0015] Furthermore, when the main valve core is in the backup hydraulic system operation, the pilot solenoid valve is energized, pushing the valve core to move to the left, so that interface P2 is connected to interface CA; and interface R2 is connected to interface CB.

[0016] Beneficial effects:

[0017] The energy conversion valve of this invention is used in the landing gear retraction system to switch the pressure source between the normal retraction system and the emergency door system of the landing gear bay. When there is a fault in the normal retraction system, the energy conversion valve is energized to switch the pressure supply function and ensure that the landing gear bay door is lowered normally. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of an energy conversion valve.

[0019] Figure 2 This is a force diagram of the valve core.

[0020] Figure 3 This is the working position of the main hydraulic system.

[0021] Figure 4 This is the backup hydraulic system working position after switching.

[0022] Figure 5 Schematic diagram of the isolation device structure of the energy conversion valve;

[0023] Figure 6 External view of the energy conversion valve. Detailed Implementation

[0024] 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.

[0025] In the description of this invention, it should be understood that the terms "center", "axial", "vertical", "upper", "lower", "upper end", "bottom end", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention.

[0026] like Figure 1 and Figure 6 As shown, the energy conversion valve is used to switch the pressure source between the normal landing gear door retraction system and the emergency door system. The inlet of the energy conversion valve connects to the control lines of both hydraulic systems. When not energized, it defaults to the main hydraulic system line providing control fluid to the load subsystem. Upon receiving a conversion signal, it switches to the backup hydraulic system to provide control fluid to the load subsystem. The valve core has reliable isolation between its two positions, and a single functional failure should not leak to the other system.

[0027] During normal operation, the TA and TB lines are connected to the main hydraulic system's inlet or outlet lines under the preload of the return spring. At this time, the switching valve's spool is in the main hydraulic system's working position, with TA connected to CA and TB connected to CB.

[0028] When a fault occurs in the normal retraction and deployment system, the pilot solenoid valve is energized, which introduces high-pressure oil from the backup hydraulic system into the valve core control chamber, pushing the valve core to the working position of the backup hydraulic system. At this time, the P2 line is connected to the CB line, the R2 line is connected to the CA line, and the main hydraulic system is isolated.

[0029] To prevent the switching function from failing due to pressure buildup caused by valve core movement or gap leakage in the cavity containing the valve core reset spring, the cavity containing the reset spring is connected to the return oil line of the main hydraulic system.

[0030] like Figure 5The isolation device of the energy conversion valve includes a valve core 5 and a valve sleeve 6. A central shoulder 5-a serves as an isolation shoulder between the two systems, and two cover shoulders on either side isolate the inlet and outlet oil between individual systems. A spring shoulder 5-d is also provided. The isolation shoulder has a first isolation ring groove 5-e and a second isolation ring groove 5-f, and the cover shoulder 5-c has a cover ring groove 5-h. The valve core 5 has a first oil passage 5-i and a second oil passage 5-l inside. The first isolation ring groove 5-e is connected to the return oil of system 1 through the first oil passage 5-i, and the second isolation ring groove 5-f is connected to the cover ring groove 5-h through the second oil passage 5-l.

[0031] The valve sleeve 6 is provided with a pressure relief hole 6-a, which is connected to the return oil of its respective system through the oil passage of the valve body.

[0032] like Figure 2 As shown, when the valve core is in the main hydraulic system (System I), the left side of the valve core is subjected to the preload force of the System I return spring, while the right side of the valve core is connected to the control chamber of the pilot control valve. The control pressure of the pilot control valve is taken from the backup hydraulic system (System II). Since the pilot control valve is a normally closed control valve, that is, when the power is off, the control chamber is connected to the return oil. Therefore, at this time, the pressure in the control chamber on the right side of the valve core is only 0.5 MPa of the pressure in the booster tank. Under the action of the System I supply oil pressure on the left side of the valve core and the preload force of the return spring, the valve core remains in the System I working position.

[0033] When switching, the pressure on the right side of the valve core overcomes the force on the left side, thus switching the function. Switching of the valve core can be achieved by applying any switching force.

[0034] Figure 3 and Figure 4 The display shows two positions before and after the main valve core switching, and these two positions will not cause the two systems to be in a connected state.

[0035] Because the main valve core working window adopts an annular groove structure, and the shoulder is located at the position where it moves out of the annular groove space, if there are certain large particles in the working fluid, they can only be isolated at the middle shoulder and the middle shared oil hole. Figure 5 Even if the main valve core is stuck in this position, it will not cause the two systems to be in a connected state.

[0036] The pilot solenoid valve integrates a spherical filter, which improves the system's resistance to contamination.

[0037] This invention discloses an energy conversion valve used in a landing gear retraction and extension system. When the main system is operating normally, the pilot solenoid valve in the energy conversion valve is not energized, and the energy conversion valve is in the main system operating position. At this time, the load subsystem communicates with the main system and isolates the backup system, and the landing gear door / landing gear actuator retracts and extends normally. When the main system malfunctions, the backup system supplies pressure, the pilot solenoid valve of the energy conversion valve is energized, the load subsystem communicates with the backup system and isolates the main system, and the landing gear door / landing gear actuator is released in an emergency. The two positions of the valve core are reliably isolated, and a single functional failure will not leak to another system.

[0038] 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 energy conversion valve used in a landing gear retraction system, characterized in that, include: The system comprises a housing, a valve core (5), a valve sleeve (6), and a pilot solenoid valve. The housing is equipped with interfaces TA, TB, CB, CA, P2, R2, and R1. The right side of the valve core is connected to the control chamber of the pilot solenoid valve, and the left side is connected to a return spring. The housing cavity is divided into a main hydraulic system cavity and a backup hydraulic system cavity. An isolation shoulder (5-a) is provided in the middle section of the valve core (5) to isolate the main hydraulic system from the backup hydraulic system. A first covering shoulder (5-c) and a second covering shoulder (5-b) are provided on both sides of the isolation shoulder (5-a) to isolate the inlet and outlet oil between the single systems. The valve core (5) is internally equipped with… It has a first oil passage (5-i) and a second oil passage (5-l). The isolation shoulder is provided with a first isolation ring groove (5-e) and a second isolation ring groove (5-f). The first oil passage (5-i) is connected to the first isolation ring groove (5-e), and the second isolation ring groove (5-f) is connected to the second oil passage (5-l). A process plug is provided at the end of the second oil passage (5-l). A cover ring groove (5-h) is provided on the first cover shoulder (5-c). The first isolation ring groove (5-e) is connected to the return oil of the main hydraulic system through the first oil passage (5-i), and the second isolation ring groove (5-f) is connected to the cover ring groove (5-h) through the second oil passage (5-l).

2. The energy conversion valve according to claim 1, characterized in that, The valve sleeve (6) is provided with a pressure relief hole, which is connected to the return oil of each system through the oil passage of the valve body.

3. The energy conversion valve according to claim 1, characterized in that, The pilot control valve is a normally closed control valve.

4. The energy conversion valve according to claim 1, characterized in that, Interfaces TA and TB are located on the first side of the housing for supplying pressure to the main hydraulic system, while interfaces P2 and R2 are located on the second side of the housing for supplying pressure to the backup hydraulic system. The first side and the second side are opposite to each other.

5. The energy conversion valve according to claim 1, characterized in that, Interfaces CB and CA are located on the third side of the housing, which is adjacent to the first side.

6. The energy conversion valve according to claim 1, characterized in that, The pilot solenoid valve has an integrated spherical filter screen.

7. The energy conversion valve according to claim 1, characterized in that, When the valve core is in operation of the main hydraulic system, the left side of the valve core is subjected to the preload force of the main hydraulic system's reset spring, and the right side of the valve core is connected to the control chamber of the pilot control valve. The control pressure of the pilot control valve is taken from the backup hydraulic system.

8. The energy conversion valve according to claim 1, characterized in that, When the main valve core is in the backup hydraulic system operation, the pilot solenoid valve is energized, pushing the valve core to move to the left, so that interface P2 is connected to interface CA; and interface R2 is connected to interface CB.

Images