Energy conversion valve used for undercarriage folding and unfolding system

Abstract

The invention belongs to the field of aviation technology undercarriage design, and relates to an energy conversion valve used for an undercarriage folding and unfolding system. When the main system works normally, the pilot electromagnetic valve in the energy conversion valve is not electrified, the energy conversion valve is located at the working position of the main system, at the moment, the load subsystem communicates with the main system and isolates the standby system, and the landing gear cabin door / landing gear actuator cylinder is normally retracted and released; when the main system breaks down, the standby system supplies pressure, a pilot electromagnetic valve of the energy conversion valve is powered on, the load subsystem communicates with the standby system, the main system is isolated, and an undercarriage cabin door / undercarriage actuator cylinder is released emergently. The two positions of the valve element are reliably isolated, and a single function fault is not leaked to another system.

Description

Technical Field

[0001] The present invention belongs to the field of aviation technology landing gear design, and relates to an energy conversion valve used in a landing gear retraction and extension system, which is used to be installed in a landing gear system with two pressure supply systems (a main pressure supply system and a backup pressure supply system). When a conversion signal is received, the hydraulic energy conversion valve switches the pressure supply system. Background Art

[0002] In the landing gear retraction system, there is a single point failure that prevents the landing gear door from opening when the landing gear is stuck in the retracted position. In the event of a failure, adaptive coordinated changes in multiple fields such as structure, electrical, and system are required, which causes many coordination problems and a long change cycle. Summary of the invention

[0003] Purpose of the invention: To provide an energy conversion valve used in a landing gear retraction and extension system, so as to avoid the simultaneous failure of two systems caused by a single point failure and the oil cross-talk between the two pressure supply systems.

[0004] Technical solution:

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

[0006] The inner cavity of the housing is divided into a main hydraulic system cavity and a backup hydraulic system cavity. An isolation convex shoulder 5-a is provided in the middle section of the valve core 5 for isolating the main hydraulic system from the backup hydraulic system. A first covering convex shoulder 5-c and a second covering convex shoulder 5-b are provided on both sides of the isolation convex shoulder 5-a for isolating the inlet and return oil between the single systems.

[0007] The valve core 5 is provided with a first oil hole 5-i and a second oil hole 5-l inside, and the isolation boss is provided with isolation ring grooves 5-e and 5-f, the oil hole 5-i is connected with the isolation ring groove 5-e, and the isolation ring groove 5-f is connected with the oil hole 5-l, and a process plug is provided at the end of the oil hole 5-l; the first covering boss 5-c is provided with a covering ring groove 5-h;

[0008] The isolation ring groove 5-e is connected to the return oil of the main hydraulic system through the oil hole 5-i, and the isolation ring groove 5-f is connected to the covering ring groove 5-h through the oil hole 5-1.

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

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

[0011] Further, the interface TA and the interface TB are arranged on the first side of the housing for supplying pressure to the main hydraulic system, and the interface P2 and the interface R2 are arranged on the second side of the housing for supplying pressure to the backup hydraulic system, and the first side is opposite to the second side.

[0012] Further, the interface CB and the interface CA are located on a third side of the shell, and the third side is adjacent to the first side.

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

[0014] Furthermore, when the valve core is in operation in the main hydraulic system, the left side of the valve core is preloaded by the return spring of the main hydraulic system, and 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 to push the valve core to move leftward, so that the port P2 is connected to the port CA; and the port R2 is connected to the port CB.

[0016] Beneficial effects:

[0017] The energy conversion valve of the present invention is used in a landing gear retraction and extension system, and is used for converting the pressure source between a normal landing gear door retraction and extension system and an emergency door system; when a fault occurs in the normal retraction and extension system, the energy conversion valve is energized to realize the conversion of the pressure supply function to ensure normal lowering of the landing gear door. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0019] Figure 2 It is the valve core force diagram.

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

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

[0022] Figure 5 The structural principle diagram of the isolation device of the energy conversion valve;

[0023] Figure 6 Energy conversion valve structure outline diagram. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the implementation of this application clearer, the technical scheme in the implementation of this application will be described in more detail in combination with the drawings in the implementation of this application. In the drawings, the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The described implementation is a part of the implementation of this application, not all of the implementations. The implementation described below with reference to the drawings is exemplary and is intended to be used to explain this application, and cannot be understood as a limitation on this application. Based on the implementation in this application, all other implementations obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. The implementation of this application is described in detail below in combination with the drawings.

[0025] In the description of the present invention, it is necessary to understand that the terms "center", "axial", "vertical", "up", "down", "upper end", "bottom end", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present invention.

[0026] like Figure 1 and Figure 6 As shown, the energy conversion valve is used to convert the pressure source between the normal landing gear door retraction and extension system and the emergency door system; the inlet of the energy conversion valve is connected to the control pipelines of the two hydraulic systems. When it is not powered, the main hydraulic system pipeline provides control oil for the load subsystem by default; when receiving the conversion signal, it switches to the backup hydraulic system to provide control oil for the load subsystem. The two positions of the valve core are reliably isolated, and a single functional failure should not leak to another system.

[0027] During normal retraction and extension, the TA and TB pipelines are connected to the main hydraulic system oil inlet or return pipeline under the action of the reset spring preload. At this time, the conversion valve and the valve core are located in the main hydraulic system working position, TA is connected to CA, and TB is connected to CB.

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

[0029] In order to prevent the conversion function from failing due to valve core movement, gap leakage and pressure buildup in the cavity where the valve core return spring is located, the cavity where the return spring is located is connected to the oil return 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. The middle boss 5-a is an isolation boss between the two systems. There are two covering bosses on both sides to achieve the isolation of the oil inlet and return between the single systems. A spring boss 5-d is provided. Isolation ring grooves 5-e and 5-f are provided on the isolation boss, and a covering ring groove 5-h is provided on the covering boss 5-c. Oil holes 5-i and 5-l are provided inside the valve core 5. The isolation ring groove 5-e is connected to the oil return of system 1 through the oil hole 5-i, and the isolation ring groove 5-f is connected to the covering ring groove 5-h through the oil hole 5-l.

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

[0032] like Figure 2 As shown in the figure, when the valve core is in the main hydraulic system (system I), the left side of the valve core is subject to the preload force of the return spring of system I, 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 standby 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 0.5MPa of the booster tank pressure. Under the action of the oil supply pressure of system I and the preload force of the return spring on the left side of the valve core, the valve core remains in the working position of system I.

[0033] When switching, the pressure on the right side of the valve core overcomes the force on the left side to achieve the switching of functions. Changing the operating force can achieve the switching of the valve core.

[0034] Figure 3 and Figure 4 Two positions are shown before and after the main spool is switched, which do not result in the two systems being in communication.

[0035] Since the working window of the main valve core adopts a ring groove structure, and the convex shoulder is the position of the movement out of the ring groove space, if there are certain large particles in the working fluid, they can only be isolated between the middle convex shoulder and the middle common oil hole ( Figure 5 ), even if the main valve core is stuck in this position, the two systems will not be connected.

[0036] The pilot solenoid valve is integrated with a spherical filter to improve the system's anti-pollution ability.

[0037] The present invention discloses an energy conversion valve used in a landing gear retraction and extension system. When the main system works normally, the pilot solenoid valve in the energy conversion valve is not energized, and the energy conversion valve is in the main system working position. At this time, the load subsystem communicates with the main system and isolates the standby system, and the landing gear door / landing gear actuator cylinder is normally retracted and extended; when the main system fails, the standby system supplies pressure, the pilot solenoid valve of the energy conversion valve is energized, the load subsystem communicates with the standby system and isolates the main system, and the landing gear door / landing gear actuator cylinder 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 is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. An energy conversion valve used in a landing gear retraction and extension system, characterized in that: include: A housing, a valve core (5), a valve sleeve (6), and a pilot solenoid valve, wherein the housing is provided with interfaces TA, TB, CB, CA, P2, R2, and R1, wherein the right side of the valve core is connected to a control chamber of the pilot solenoid valve, and the left side of the valve core is connected to a return spring; The inner cavity of the housing is divided into a main hydraulic system cavity and a backup hydraulic system cavity. The middle section of the valve core (5) is provided with an isolation convex shoulder (5-a) for isolating the main hydraulic system from the backup hydraulic system. The isolation convex shoulder (5-a) is provided with a first covering convex shoulder (5-c) and a second covering convex shoulder (5-b) on both sides thereof for achieving oil inlet and return isolation between the single systems. A first oil hole (5-i) and a second oil hole (5-l) are provided inside the valve core (5); isolation ring grooves (5-e) and (5-f) are provided on the isolation boss; the oil hole (5-i) is communicated with the isolation ring groove (5-e); the isolation ring groove (5-f) is communicated with the oil hole (5-l); a process plug is provided at the end of the oil hole (5-l); a covering ring groove (5-h) is provided on the first covering boss (5-c); The isolating ring groove (5-e) is connected to the oil return of the main hydraulic system through the oil through hole (5-i), and the isolating ring groove (5-f) is connected to the covering ring groove (5-h) through the oil through hole (5-l).

2. The energy conversion valve according to claim 1, characterized in that: The valve sleeve (6) is provided with pressure relief holes which are connected to the oil return of the respective systems through the oil through holes 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: Interface TA and interface TB are arranged on the first side of the housing for supplying pressure to the main hydraulic system, and interface P2 and interface R2 are arranged on the second side of the housing for supplying pressure to the backup hydraulic system. The first side is opposite to the second side.

5. The energy conversion valve according to claim 1, characterized in that: The interface CB and the interface CA are located on a third side of the housing, and the third side 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.

7. The energy conversion valve according to claim 1, characterized in that: When the valve core is working in the main hydraulic system, the left side of the valve core is acted upon by the preload force of the return spring of the main hydraulic system, 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 to push the valve core to the left, so that the interface P2 is connected to the interface CA; and the interface R2 is connected to the interface CB.

Images