An electrically explodable valve for use in a fuel system of an aircraft

Abstract

The application discloses an electric explosion valve suitable for an aircraft fuel system, which is composed of a valve shell, an extrusion joint, a diaphragm, a striker, a striker rod shell, a locking nut, an O-shaped ring and a pusher. The diaphragm is installed at one end of the valve shell and is tightly sealed by the extrusion joint; the striker with the O-shaped ring is placed at the other side of the diaphragm and is used for breaking the diaphragm at a working moment to realize the conduction of an oil path or a gas path and the axial sealing after the conduction; the pusher is installed in the striker rod shell and is integrally installed at the other end of the valve shell after being locked by the locking nut, and is used for providing an initial acting force and an acting distance for the striker at the working moment. The electric explosion valve has the advantages of simple structure, low cost, stable and reliable diaphragm sealing and opening, good axial sealing of the striker after the conduction of the oil path or the gas path, and can effectively meet the working characteristics of long storage and maintenance-free of the fuel system.

Description

Technical Field

[0001] This invention belongs to the field of aircraft technology, specifically relating to an electro-explosive valve suitable for aircraft fuel systems. Background Technology

[0002] Given the characteristics of aircraft fuel systems—long storage, maintenance-free operation, and single-use—the design must consider the impact of storage life, storage and operating environment, launch separation overload, and maintenance-free requirements. The long storage and maintenance-free characteristics necessitate that the fuel system be a sealed container, ensuring complete isolation between the internal fuel and the external environment before use. Therefore, a safe and reliable valve needs to be designed between the fuel system and the engine, sealing it before use and opening it during operation. Due to its single-use nature, the valve does not need to be closed again during operation.

[0003] Valves used for opening and closing can be categorized into manual valves, pneumatic valves, electric valves, and electro-explosive valves, depending on their actuation method. Manual valves are the most basic type, operated manually. Pneumatic valves use pressurized air as power, employing a cylinder piston to drive the valve's opening and closing. Electric valves are electrically driven and are the most commonly used type of valve actuation. Electro-explosive valves utilize the instantaneous thrust generated by the action of pyrotechnic devices to push a trigger rod, releasing the lock and thus opening or closing the valve.

[0004] Electric valves are widely used in automation systems and can be controlled remotely. However, they are relatively complex in construction and not suitable for use in humid environments. When used with explosive media, they require explosion-proof treatment. Their reliability is generally average, and they require regular maintenance. Electric explosion valves, on the other hand, have a simple structure, small size, high reliability, and no energy consumption. They are suitable for various complex working conditions, have strong environmental adaptability, can be stored for long periods, and require no maintenance.

[0005] In the design and development of fuel systems, the use of electro-explosive valves as valve devices between the fuel system and the engine is a technologically mature, simple, low-cost, and highly reliable approach. Summary of the Invention

[0006] To overcome the shortcomings of existing technologies, this invention provides an electro-explosive valve suitable for aircraft fuel systems, comprising a valve body, a compression joint, a diaphragm, a striker, a striker housing, a locking nut, an O-ring, and a pusher. The diaphragm is installed at one end of the valve body and pressed and sealed by the compression joint. A striker with an O-ring is placed on the other side of the diaphragm, used to break the diaphragm during operation, achieving the opening of the oil or gas passage and subsequent axial sealing. A pusher is installed inside the striker housing, locked with the locking nut, and then mounted on the other end of the valve body, providing an initial force and operating distance to the striker during operation. This invention features a simple structure and manufacturing process, low cost, stable and reliable diaphragm sealing and opening, and good axial sealing of the striker after the oil or gas passage is opened, effectively meeting the long-term storage and maintenance-free operation requirements of fuel systems.

[0007] The technical solution adopted by this invention to solve its technical problem is as follows: An electro-explosive valve suitable for an aircraft fuel system includes a valve body, a compression fitting, a diaphragm, a striker, a striker housing, a lock nut, an O-ring, and a pusher. The diaphragm is installed at one end of the valve body, and one side of the diaphragm is pressed and sealed with a compression joint for the isolation of oil or gas circuits. On the other side of the diaphragm, a striker with an O-ring is placed to break the diaphragm during operation, thereby opening the fuel system's oil or gas passage and sealing the electro-explosive valve body after opening. The inside of the striker housing is equipped with a pusher, which is locked with a lock nut and then installed as a whole at the other end of the valve housing. It is used to give the striker an initial force and a working distance during operation. The valve housing is equipped with a conductive pipeline to ensure continuous flow of oil or air after the striking pin breaks the diaphragm.

[0008] Preferably, the extrusion joint has an external threaded interface as the inlet connection of the electric explosion valve to the fuel system.

[0009] Preferably, the valve body is provided with an external threaded interface as the outlet connection of the electric explosion valve to the engine.

[0010] Preferably, the extrusion joint has a pointed annular boss on one side of the pressing diaphragm for pressing and sealing.

[0011] Preferably, the firing pin is provided with a sealing ring groove, which serves as an axial seal after the sealing ring is installed.

[0012] Preferably, the striking pin is provided with a striking tip and a guide groove, and the guide groove can realize the opening of the oil passage or the air passage after the diaphragm is broken.

[0013] Preferably, the O-ring is made of oil-resistant fluorosilicone rubber.

[0014] Preferably, the diaphragm is made of brass.

[0015] Preferably, the valve body, extrusion joint, striking pin, striking rod housing, locking nut, and pusher are all made of stainless steel 06Cr19Ni10.

[0016] Preferably, the thickness of the diaphragm is 0.5 mm.

[0017] The beneficial effects of this invention are as follows: The present invention has a simple structure and manufacturing process, low cost, stable and reliable diaphragm sealing and opening, and good axial sealing of the striker after the oil or gas circuit is connected, which can effectively meet the working characteristics of long storage and maintenance-free operation of fuel system. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the electric explosion valve of the present invention.

[0019] Reference numerals: 1-valve body, 2-compression fitting, 3-impact pin, 4-diaphragm, 5-lock nut, 6-impact rod housing, 7-O-ring, 8-promoter. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] This invention is suitable for long-term storage and maintenance-free operation, and is mainly used for the isolation and connection of oil or air passages between the fuel system and the engine.

[0022] To solve the above-mentioned technical problems, the electric explosion valve of the present invention comprises eight components: valve body, extrusion joint, diaphragm, striking pin, striking rod housing, locking nut, O-ring, and pusher.

[0023] A diaphragm is installed at one end of the valve body. One side of the diaphragm is pressed and sealed with a compression joint to isolate the oil or air circuit. A striker with an O-ring is placed on the other side of the diaphragm to break the diaphragm during operation, so as to open the oil or air circuit of the fuel system and seal the valve body after opening. The striker housing contains a pusher, which is locked in place with a lock nut and then mounted on the other end of the valve housing. It is used to provide an initial force and a working distance to the striker during operation.

[0024] The valve body is equipped with a conductive pipeline to ensure continuous flow of oil or air after the striking pin breaks the diaphragm.

[0025] In this invention, the external threaded interface on the extrusion joint serves as the inlet connection to the fuel system of the electro-explosive valve; the external threaded interface on the valve housing serves as the outlet connection to the engine of the electro-explosive valve. The extrusion joint has a pointed annular boss of a certain height on the side that presses the diaphragm for sealing. The striker has a sealing ring groove, which provides axial sealing after the sealing ring is installed. The striker has a striking tip and a guide groove; after breaking the diaphragm, the guide groove allows for the opening of either the oil or gas path. The pusher is a pyrotechnic mechanism; the high-temperature combustion gas inside pushes the pusher rod, generating a certain force and propelling it forward a certain distance. This force and distance are applied to the striker, thus opening the electro-explosive valve.

[0026] Example: like Figure 1 As shown, the present invention consists of a valve housing 1, a compression joint 2, a striking pin 3, a diaphragm 4, a locking nut 5, a striking rod housing 6, an O-ring 7, and a pusher 8.

[0027] The O-ring is made of oil-resistant fluorosilicone rubber, the diaphragm is made of brass, and other parts are made of ordinary stainless steel (06Cr19Ni10).

[0028] The diaphragm thickness is designed based on the maximum pressure in the fuel system during sealing, ensuring that the diaphragm does not undergo plastic deformation under maximum pressure conditions. The diaphragm thickness is designed to be 0.5 mm based on actual conditions.

[0029] The interfaces on the valve body and the extrusion fitting are designed according to aviation standard HB4-1-2002, and the threads are designed according to aviation standard HB4-3-2002.

[0030] The high-temperature gas inside the pusher generates a force of no less than 300N, pushing it forward a distance of 5mm. The internal conduit of the valve body can be designed according to actual usage and connection method. In this invention, a "4"-shaped internal conduit is designed, so that the valve inlet and outlet are on the same side, resulting in a compact spatial layout. To ensure the diaphragm seal after the extrusion joint is installed, a 40Nm torque wrench must be used for installation.

[0031] When performing a sealing test on an electrically explosive valve, first complete the valve assembly as required (without installing the pusher). Then, connect the sealing test air circuit from the valve body connector (outlet) and place it in a water tank. Maintain the pressure at a specific pressure (0.8 MPa) for 15 minutes, ensuring no air bubbles are present.

[0032] Compared with solenoid valves, this invention has a simple structure, is durable for long-term storage, requires no maintenance, has low cost, and high reliability.

Claims

1. An electro-explosive valve suitable for aircraft fuel systems, characterized in that, Includes valve body, compression fitting, diaphragm, striking pin, striking rod housing, lock nut, O-ring, and pusher; The diaphragm is installed at one end of the valve body, and one side of the diaphragm is pressed and sealed with a compression joint for the isolation of oil or gas circuits. On the other side of the diaphragm, a striker with an O-ring is placed to break the diaphragm during operation, thereby opening the fuel system's oil or gas passage and sealing the electro-explosive valve body after opening. The inside of the striker housing is equipped with a pusher, which is locked with a lock nut and then installed as a whole at the other end of the valve housing. It is used to give the striker an initial force and a working distance during operation. The valve housing is equipped with a conductive pipeline to ensure continuous flow of oil or air after the striking pin breaks the diaphragm.

2. The electro-explosive valve for an aircraft fuel system according to claim 1, characterized in that, The extrusion joint is equipped with an external threaded interface as the inlet connection of the electric explosion valve to the fuel system.

3. The electro-explosive valve for an aircraft fuel system according to claim 1, characterized in that, The valve body is provided with an external threaded interface as the outlet connection of the electric explosion valve to the engine.

4. An electro-explosive valve for an aircraft fuel system according to claim 1, characterized in that, The extrusion joint has a pointed annular boss on one side of the diaphragm for pressing and sealing.

5. An electro-explosive valve for an aircraft fuel system according to claim 1, characterized in that, The firing pin is provided with a sealing ring groove, which serves as an axial seal after the sealing ring is installed.

6. An electro-explosive valve for an aircraft fuel system according to claim 1, characterized in that, The impact pin is equipped with an impact tip and a guide groove. After the diaphragm is broken, the guide groove can enable the oil or gas passage to be opened.

7. An electro-explosive valve for an aircraft fuel system according to claim 1, characterized in that, The O-ring is made of oil-resistant fluorosilicone rubber.

8. An electro-explosive valve for an aircraft fuel system according to claim 1, characterized in that, The diaphragm is made of brass.

9. An electro-explosive valve for an aircraft fuel system according to claim 1, characterized in that, The valve body, extrusion joint, striking pin, striking rod housing, locking nut, and pusher are all made of stainless steel 06Cr19Ni10.

10. An electro-explosive valve for an aircraft fuel system according to claim 1, characterized in that, The thickness of the diaphragm is 0.5 mm.

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