Switch array leader aircraft missile pylon ejection valve and control method

Abstract

The present application belongs to the field of aircraft missile rack ejection system control, and specifically relates to a switch array pilot aircraft missile rack ejection valve and a control method. The ejection valve comprises a flow valve and a pilot stage for controlling the flow valve, and the pilot stage comprises a hydraulic half-bridge composed of multiple electromagnetic switch valves in parallel, fixed orifice and switch type orifice controlled by pressure difference. When working, the switch type orifice is always open if the electromagnetic switch valve is fully closed, and the flow valve is closed; when any electromagnetic switch valve is opened, the switch type orifice is closed under the action of pressure difference, and the flow valve is quickly opened to supply oil. The present application adopts the redundant design of multiple electromagnetic switch valves in parallel to replace the traditional single pilot electromagnetic valve with low reliability, so that normal work can be realized under the condition of single electromagnetic switch valve failure, and the overall reliability of the system is significantly improved. When ejection works, the switch type orifice has a smaller diameter under the action of pressure difference, so that the spool of the flow valve is quickly opened, and the response speed of the ejection valve is improved.

Description

Technical Field

[0001] This invention belongs to the field of aircraft missile pylon ejection systems, specifically a switch array pilot aircraft missile pylon ejection valve and control method. Background Technology

[0002] In the application of aircraft missile ejection systems and other airborne weapon launches, stringent requirements are placed on the rapid launch and low-impact separation capabilities of the weapon system. Aircraft have limited space, complex operating environments, and must adapt to high-frequency sorties and rapid, continuous combat rhythms; therefore, ejection systems must possess extremely high reliability and dynamic response performance. To achieve this goal, the high-pressure fluid control system, as the core of ejection drive, has its rapid response capability and long-term operational reliability as key technical indicators. Existing technologies generally employ a pilot valve-driven main valve control method. The rapid action of the pilot valve controls the main valve, thereby achieving on / off control of the high-pressure fluid, and ultimately driving the ejection mechanism to complete missile launch.

[0003] In existing technologies, a common approach is to use a single pilot solenoid valve to control the main valve's operation. However, this design suffers from significant reliability flaws in aviation environments. Relying solely on a single pilot solenoid valve creates a single point of failure in the entire launch chain. In the complex environments of high vibration, large temperature differences, and electromagnetic interference encountered by aircraft, the pilot solenoid valve is prone to failure due to jamming, wear, or coil malfunction. This can lead to the main valve failing to respond properly to control signals, blocking the delivery of high-pressure fluid to the ejection actuator, and ultimately causing missile launch failure. This not only affects the completion of a single mission but may also disrupt the operational rhythm and mission continuity. Furthermore, the dynamic response performance of existing pilot valves is insufficient to meet the demands of rapid, continuous launches in modern air-to-ground weapons. Limited by the inertia and inductive delay of the solenoid valve core, the main valve's opening and closing exhibits a response lag, which is detrimental to achieving precise timing of multiple missile launches and ensuring aircraft safety.

[0004] Therefore, given the higher requirements for reliability, environmental adaptability, and launch response speed of aircraft missile pylon ejection systems in complex aviation environments, there is an urgent need to develop a pilot control scheme that can adapt to airborne conditions and has both high reliability and rapid dynamic response. This has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] The purpose of this invention is to solve the technical problems of insufficient reliability and poor dynamic response performance of the ejection valve in the prior art due to the use of a single pilot valve, and to provide a switch array pilot aircraft missile rack ejection valve and control method that can avoid the risk of single point failure and improve the opening and reset response speed.

[0006] The first aspect of the present invention is to provide a switch array pilot aircraft missile pylon ejection valve, including a flow valve and a pilot stage for controlling the flow valve. The flow valve includes a main valve body and a main valve core. The main valve core divides the cavity inside the main valve body into a rod chamber and a rodless chamber. A working oil port is opened in the rod chamber at a position directly opposite the valve core rod. The oil inlet is connected to the rod chamber. The pilot stage controls the axial movement of the main valve core. The on / off state between the oil inlet and the working oil port is controlled by the axial movement of the main valve core.

[0007] The pilot stage includes an electromagnetic switching valve assembly and a damping mechanism;

[0008] The inlet of the electromagnetic switch valve assembly is connected to the rodless chamber, and the outlet is connected to the return port. The electromagnetic switch valve assembly includes at least two electromagnetic switch valves arranged in parallel.

[0009] The damping mechanism includes a fixed damping orifice and a switchable damping valve arranged in parallel. The inlet of the damping mechanism is connected to the oil inlet, and the outlet is connected to both the rodless chamber and the inlet of the electromagnetic switch valve. The switchable damping valve includes a damping valve body and a damping valve core that is axially movable within the damping valve body. The damping valve core divides the cavity within the damping valve body into a first chamber and a second chamber. An oil outlet and a first oil inlet are provided on the side wall of the first chamber, and a second oil inlet is provided on the side wall of the second chamber. Both the first and second oil inlets are connected to the oil inlet.

[0010] The pressure difference across the switch-type damping valve is controlled by opening and closing the electromagnetic switch valve group. When all electromagnetic switch valves are closed, the switch-type damping valve is normally open, and the working port of the flow valve is closed. When at least one electromagnetic switch valve is open, the switch-type damping valve is closed, and the working port of the flow valve is open.

[0011] Furthermore, the damping valve core includes a piston body and a piston rod. The piston rod is located in the first chamber, and the oil outlet is directly opposite the piston rod. The axial movement of the piston rod controls the on / off state of the oil outlet and the first oil inlet.

[0012] A return spring is fitted onto the piston rod, with its two ends abutting against the oil outlet and the piston body, respectively.

[0013] Furthermore, in the initial state, all electromagnetic switch valves are in the closed state, the effective hydraulic action area of ​​the first chamber is equal to that of the second chamber, and the pressure in the first chamber and the second chamber is the same. When this condition is met, the reset spring drives the damping valve core away from the oil outlet, the oil outlet is connected to the first oil inlet, and the switch-type damping valve is in the normally open state.

[0014] Furthermore, the electromagnetic switch valve assembly consists of three electromagnetic switch valves connected in parallel, and each electromagnetic switch valve is a two-position normally closed electromagnetic switch valve.

[0015] Furthermore, a reset elastic element is also provided in the rodless chamber of the flow valve. One end of the reset elastic element is fixed to the bottom wall of the main valve core, and the other end is fixed to the bottom wall of the rodless chamber.

[0016] In the initial state, when each electromagnetic switch valve is not energized, the effective hydraulic action area of ​​the rodless chamber is greater than that of the rod chamber; the pressure in the rod chamber is equal to the pressure in the rodless chamber, and the hydraulic pressure in the rodless chamber is greater than the sum of the hydraulic pressure in the rod chamber and the elastic force of the reset elastic element, and the main valve core seals the working oil port.

[0017] Furthermore, the electromagnetic switch valve assembly consists of three electromagnetic switch valves connected in parallel;

[0018] When in operation, the flow valve is open: at least one of the electromagnetic switch valves is open, the pressure in the first chamber decreases, the pressure in the second chamber is the system pressure, the pressure in the second chamber is greater than the pressure in the first chamber, and the hydraulic pressure in the second chamber is greater than the sum of the hydraulic pressure in the first chamber and the elastic force of the return spring. The damping valve core moves toward the oil outlet until the oil outlet is blocked.

[0019] The rod chamber of the flow valve is the system pressure, and the pressure in the rodless chamber is less than the pressure in the rod chamber. The hydraulic pressure in the rod chamber is greater than the sum of the hydraulic pressure in the rodless chamber and the elastic force of the reset elastic element. The main valve core moves away from the working port and compresses the reset elastic element until it reaches the equilibrium position, and the inlet port is connected to the working port.

[0020] Furthermore, the electromagnetic switch valve assembly consists of three electromagnetic switch valves connected in parallel;

[0021] When in operation, the flow valve is reset: when all three solenoid valves are closed, the pressure in the first chamber rises to the system pressure, the pressure in the second chamber is the system pressure, and the hydraulic pressure in the second chamber is less than the sum of the hydraulic pressure in the first chamber and the spring force of the reset spring. The damping valve core moves away from the oil outlet and opens the oil outlet.

[0022] The rod chamber of the flow valve is at the system pressure, and the pressure in the rodless chamber rises to the system pressure. The hydraulic pressure in the rod chamber is less than the sum of the hydraulic pressure in the rodless chamber and the elastic force of the reset elastic element. The main valve core moves towards the working port to close the working port.

[0023] A second aspect of the present invention is to provide a control method for an ejection valve of a missile pylon on a pilot-type aircraft with a switch array, wherein the ejection valve is any one of the ejection valves described above, and the method includes the following steps:

[0024] When it is necessary to open the flow valve, at least one solenoid valve in the solenoid valve assembly is opened to unload the rodless chamber through the opened solenoid valve; and

[0025] The pressure difference generated across the on / off damping valve during unloading in the rodless chamber is used to automatically close the on / off damping valve, thereby limiting the replenishment flow from the inlet to the rodless chamber and accelerating the opening of the flow valve.

[0026] Furthermore, it also includes a reset step:

[0027] When the flow valve needs to be closed, the solenoid switch valve assembly is closed, causing the pressure difference across the on / off damping valve to disappear and automatically open. This allows the rodless chamber to be pressurized through the fixed damping orifice and the open on / off damping valve, thus accelerating the closure of the flow valve.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] (1) This invention replaces the traditional single-pilot solenoid valve by using at least two, preferably three, parallel-connected solenoid switching valves to form a redundant pilot stage. When one or even two solenoid switching valves fail to open, the remaining healthy solenoid switching valves can still perform the unloading function of the rodless chamber of the flow valve, ensuring that the system can continue to work or achieve derating operation. This avoids the problem of the entire ejection function being completely lost due to a single point of failure, and significantly improves the overall reliability of the system and the success rate of the mission.

[0030] (2) This invention achieves intelligent adjustment of the pilot oil circuit damping by setting a dynamic damping mechanism composed of a fixed damping orifice and a switchable damping valve connected in parallel. When the ejection operation is underway, i.e., when the flow valve is open, the switchable damping valve automatically closes due to the pressure difference between its two ends, effectively limiting the oil supply flow to the rodless chamber of the flow valve, thereby accelerating the opening speed of the flow valve; when the flow valve is resetting, the switchable damping valve automatically opens, increasing the channel for pressurizing the rodless chamber, significantly accelerating the closing speed of the flow valve. This design optimizes the bidirectional dynamic response characteristics of the flow valve. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 A schematic diagram of the hydraulic control system for an ejector valve provided in an embodiment of this application;

[0033] Figure 2 This is a schematic diagram of the structure of a switch-type damping valve provided in an embodiment of this application;

[0034] Figure 3This is a schematic diagram illustrating the working principle of an ejector valve in the closed state according to an embodiment of this application;

[0035] Figure 4 A schematic diagram illustrating the working principle of an ejector valve during the opening process, provided in an embodiment of this application;

[0036] Figure 5 This is a schematic diagram of the closed position of a switch-type damping valve provided in an embodiment of this application;

[0037] Figure 6 This is a schematic diagram of the open position of a switch-type damping valve provided in an embodiment of this application;

[0038] Figure 7 A schematic diagram of the closed position of a flow valve provided in an embodiment of this application;

[0039] Figure 8 This is a schematic diagram showing the open position of a flow valve provided in an embodiment of this application.

[0040] Wherein: 10-Flow valve; 101-Main valve core; 102-Rod chamber; 103-Rodless chamber; 104-Reset elastic element; 20-Pilot stage; 21-Solenoid valve assembly; 201-Solenoid valve one; 202-Solenoid valve two; 203-Solenoid valve three; 22-Damping mechanism; 221-Fixed damping hole; 222-On / off damping valve; 2221-Damping valve core; 22211-Piston body; 22212-Piston rod; 2222-Reset spring; 2223-First chamber; 2224-Second chamber; 2225-Outlet port; 2226-First inlet port; 2227-Second inlet port; P-Inlet port; Po-Working port; T-Return port. Detailed Implementation

[0041] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0042] The following is in conjunction with the appendix Figure 1 To be continued Figure 8 The invention is described in detail with specific embodiments.

[0043] See Figures 1 to 8This invention provides a pilot-operated ejection valve for a missile pylon on a switch array aircraft, comprising a flow valve 10 and a pilot stage 20 for controlling the flow valve 10. The flow valve 10, as the main body for controlling the flow of high-pressure fluid, includes a main valve body and a main valve core 101 that can slide axially within the main valve body. The main valve core 101 divides the cavity within the main valve body into a rod chamber 102 and a rodless chamber 103. High-pressure fluid enters the system through an inlet P, whose oil passage is directly connected to the rod chamber 102, thus ensuring that the rod chamber 102 is always under system pressure. A working port Po is provided in the rod chamber 102, directly opposite the valve stem. The axial movement of the main valve core 101 can precisely control the fluid passage between the inlet port P and the working port Po to be in a connected or disconnected state. To achieve reliable closing and resetting, a reset elastic element 104 (e.g., a compression spring) is also provided in the rodless chamber 103. One end of the reset elastic element 104 abuts against the end face of the main valve core 101, and the other end abuts against the bottom wall of the rodless chamber 103, always providing the main valve core 101 with an elastic preload pointing towards the closed position. A key structural feature is that, in the initial state (i.e., when the working port is closed), the effective hydraulic action area of ​​the rodless chamber 103 (denoted as...) It is designed to have a larger effective hydraulic action area than the rod-side cavity 102 (denoted as ). This area difference is the basis for realizing the hydraulic control of the flow valve 10. That is to say, when the pressures of the two chambers are equal, the hydraulic pressure generated by the rodless chamber 103 will be greater than the hydraulic pressure generated by the rod chamber 102.

[0044] The pilot stage 20, as the core control component of this application, functions to precisely and rapidly regulate the pressure within the rodless chamber 103, thereby indirectly controlling the movement of the main valve core 101. The pilot stage 20 includes an electromagnetic switching valve assembly 21 and a damping mechanism 22.

[0045] The electromagnetic switch valve assembly 21 includes at least two electromagnetic switch valves connected in parallel. In a preferred embodiment, the assembly consists of three electromagnetic switch valves connected in parallel: electromagnetic switch valve one 201, electromagnetic switch valve two 202, and electromagnetic switch valve three 203. These three electromagnetic switch valves are all two-position, normally closed electromagnetic switch valves. The common inlet of the electromagnetic switch valve assembly 21 is connected to the rodless chamber 103 of the flow valve 10, while its common outlet is connected to the system's return port T. When the electromagnetic switch valve assembly 21 is de-energized, if all three electromagnetic switch valves are in the closed position, the passage from the rodless chamber 103 to the return port T is cut off. When the electromagnetic switch valve assembly 21 is energized, if any one of the electromagnetic switch valves opens, a low-resistance unloading channel is provided to the rodless chamber 103 leading to the return port T. The parallel design of the three electromagnetic switch valves in this application aims to create redundant control, thereby significantly improving the reliability of the pilot unloading function.

[0046] A damping mechanism 22 is disposed between the oil inlet P and the rodless chamber 103 to provide controlled oil replenishment to the rodless chamber 103. This damping mechanism 22 includes a fixed damping orifice 221 and a switchable damping valve 222 arranged in parallel. The fixed damping orifice 221 is a throttling orifice with a fixed small diameter, which always provides a flow-limited oil replenishment path from the oil inlet to the rodless chamber 103. The switchable damping valve 222 is a passive valve that automatically changes its on / off state in response to the pressure difference across its terminals.

[0047] The inlet of the damping mechanism 22 is connected to the oil inlet P, and the outlet is connected to both the rodless chamber 103 and the inlet of the solenoid valve assembly 21; see reference. Figure 2 The on / off damping valve 222 includes a damping valve body and a damping valve core 2221 axially movable within the damping valve body. The damping valve core 2221 divides the cavity within the damping valve body into a first chamber 2223 and a second chamber 2224. The side wall of the first chamber 2223 has an oil outlet 2225 communicating with the rodless chamber 103 and a first oil inlet 2226 communicating with the oil inlet P. The side wall of the second chamber 2224 has a second oil inlet 2227 communicating with the oil inlet P. Thus, both the first oil inlet 2226 and the second oil inlet 2227 are connected to the oil inlet P, so that the second chamber 2224 always bears the system pressure, while the pressure of the first chamber 2223 depends on the pressure of the rodless chamber 103 connected to the oil outlet 2225.

[0048] In this application, the opening and closing of the on / off damping valve 222 is controlled by the pressure difference across its two ends. In the initial state, when all solenoid valves are closed, the on / off damping valve 222 is normally open, and the working port Po of the flow valve 10 is closed. When at least one solenoid valve is open, the on / off damping valve 222 is closed, and the working port Po of the flow valve 10 is open, that is, the working port Po is connected to the inlet port P.

[0049] This invention utilizes three parallel electromagnetic switching valves to form a redundant pilot stage, replacing the traditional single-pilot electromagnetic valve. When one or even two electromagnetic switching valves fail to open, the remaining healthy valves can still unload the rodless chamber 103 of the flow valve 10, ensuring the system can continue operating or operate at reduced capacity. This avoids the complete loss of the ejection function due to a single point of failure, significantly improving the overall system reliability and mission success rate. Furthermore, by setting a dynamic damping mechanism 22 consisting of a fixed damping orifice 221 and a switchable damping valve 222 connected in parallel, intelligent adjustment of the pilot oil circuit damping is achieved. During ejection operation, i.e., when the flow valve 10 opens, the switchable damping valve 222 automatically closes due to the pressure difference between its two ends, effectively limiting the replenishment flow to the rodless chamber 103 of the flow valve 10, thereby accelerating the opening speed of the flow valve 10. When the flow valve 10 resets, the switchable damping valve 222 automatically opens, increasing the channel for pressurizing the rodless chamber 103, significantly accelerating the closing speed of the flow valve 10. This design optimizes the bidirectional dynamic response characteristics of the flow valve 10.

[0050] For further details, please refer to [link / reference]. Figure 2 The damping valve core 2221 is specifically designed to include a piston body 22211 and a piston rod 22212. The piston rod 22212 is located within the first chamber 2223, and the oil outlet 2225 is directly opposite to the piston rod 22212. The inner diameter of the oil outlet 2225 matches the outer diameter of the piston rod 22212. The axial movement of the piston rod 22212 can block or open the oil outlet 2225, thereby controlling the connection between the first oil inlet 2226 and the oil outlet 2225. A return spring 2222 is fitted on the piston rod 22212. The two ends of the return spring 2222 abut against the inner wall of the valve body and the piston body 22211 surrounding the oil outlet 2225, respectively. The return spring 2222 provides a force that causes the damping valve core 2221 to tend to open the oil outlet 2225. When the hydraulic pressure in the first chamber 2223 and the second chamber 2224 is the same, the return spring 2222 drives the damping valve core 2221 away from the oil outlet 2225, and the oil outlet 2225 is connected to the first oil inlet 2226. In this embodiment, the on / off damping valve 222 is in the normally open state, and the effective hydraulic action area of ​​the first chamber 2223 and the effective hydraulic action area of ​​the second chamber 2224 are designed to be equal.

[0051] Furthermore, in the initial state, the effective hydraulic action area of ​​the rodless chamber 103 is greater than that of the rod chamber 102; when each solenoid valve is not energized, the pressure in the rod chamber 102 and the pressure in the rodless chamber 103 are equal, and both are system pressures. Under the action of hydraulic pressure in rodless chamber 103 and elastic force of reset elastic element 104, main valve core 101 seals working oil port Po.

[0052] The following is in conjunction with the appendix Figure 3 To be continued Figure 8 The complete working cycle of the ejector valve in this embodiment is described below.

[0053] In the initial closed state, such as Figure 3 As shown, the external control system did not issue a command to the solenoid valve assembly 21. Solenoid valve 1 (201), solenoid valve 2 (202), and solenoid valve 3 (203) were all in a normally closed, de-energized state, completely cutting off the passage between the rodless chamber 103 and the return port T. The high-pressure oil from the inlet P directly enters the rod chamber 102, causing its pressure to reach the system pressure. On the other hand, the rodless chamber 103 is pressurized by the damping mechanism 22. At this time, since the pressure in the rodless chamber 103 is equal to the pressure at the oil inlet P, there is no pressure difference between the two ends of the on / off damping valve 222 (i.e., the first chamber 2223 and the second chamber 2224), that is... , To restore the elastic force of spring 2222, To determine the effective hydraulic action area of ​​the on / off damping valve 222 in the open state, under the action of the return spring 2222, the damping valve core 2221 is pushed away from the oil outlet 2225, causing the on / off damping valve 222 to be in the fully open state. Therefore, high-pressure oil can rapidly pressurize the rodless chamber 103 through the two parallel pathways of the fixed damping orifice 221 and the open on / off damping valve 222, until its pressure reaches the system pressure. At this time, the force acting on the main valve core 101 includes: the hydraulic pressure of the rod chamber 102. , The effective hydraulic operating area of ​​the rod-side chamber 102 in the initial state; and the hydraulic pressure of the rodless chamber 103. and the elastic force of the reset elastic element 104 , This is the effective hydraulic operating area of ​​the rodless cavity 103. In view of the aforementioned... From the structural design, it can be seen that ,and Much larger This firmly presses the main valve core 101 onto the main valve body, reliably sealing the working oil port Po, and keeping the ejector valve in a stable closed state. Specifically, Figures 5 to 6 This is a schematic diagram illustrating the principle of a switch-type damping valve transitioning from the closed to the open position. With the oil outlet 2225 closed, the effective hydraulic action area of ​​the first chamber 2223 is... The effective hydraulic action area of ​​the second chamber 2224 is , With the oil outlet 2225 open and the damping valve core 2221 moving, the effective hydraulic action area of ​​the first chamber 2223 and the second chamber 2224 is both , The damping valve core 2221 moves to the initial position of the open state.

[0054] When an ejection mission is required, the ejection valve opens, such as... Figure 4 As shown. The control system simultaneously applies an energizing command to the three solenoid valves in the solenoid valve assembly 21, causing all three solenoid valves to open simultaneously, quickly connecting the rodless chamber 103 to the return port T. Due to the large total flow area of ​​the unloading channel, the oil in the rodless chamber 103 is rapidly discharged, and its pressure decreases from the system pressure. The pressure drops rapidly to a low level close to the return oil port pressure T. The sudden drop in pressure has a significant impact on the damping mechanism 22: specifically, the pressure in the second chamber 2224 of the on / off damping valve 222 remains at [value missing]. Meanwhile, the pressure in the first chamber 2223 decreases as the pressure in the rodless chamber 103 drops. .because A much stronger hydraulic pressure than that in the first chamber 2223 is generated in the second chamber 2224. This thrust overcomes the sum of the reverse thrust of the first chamber 2223 and the elastic force of the return spring 2222. As a result, the damping valve core 2221 is driven to move rapidly towards the oil outlet 2225 until the end of its piston rod 22212 completely blocks the oil outlet 2225. At this point, the hydraulic pressure in the second chamber 2224 is greater than the sum of the hydraulic pressure in the first chamber 2223 and the elastic force of the return spring, that is... This is due to the elastic force of the return spring 2222 at this time. To ensure effective hydraulic action area when the oil outlet 2225 is closed, the on / off damping valve 222 automatically closes. This cuts off the high-flow-rate replenishment channel from the oil inlet P to the rodless chamber 103, allowing replenishment only through the smaller-diameter fixed damping orifice 221. This design significantly limits the replenishment flow, thereby dramatically accelerating the unloading process of the rodless chamber 103. Simultaneously, in the flow valve 10, the force state of the main valve core 101 is fundamentally reversed. The thrust within the rod chamber 102... The thrust within the rodless cavity 103 remains unchanged, while the thrust within the rodless cavity 103 becomes... and the elastic force of the reset elastic element 104 The sum of. Due to Lower, making Much larger The enormous net opening force drives the main valve core 101 to overcome resistance, rapidly move downwards, and compress the reset elastic element 104 until a new force balance position is reached. During this process, the channel between the inlet port P and the working port Po is opened, and high-pressure oil is output from the working port Po to drive the subsequent ejection mechanism. This series of actions constitutes a control method that utilizes the pressure difference generated across the on / off damping valve 222 during unloading of the rodless chamber 103, causing it to automatically close, thus limiting the replenishment flow and accelerating the opening of the flow valve 10. Specifically, Figures 7 to 8 This refers to the process from the start of depressurization of the electromagnetic switch valve assembly to the completion of depressurization. When depressurization begins, the pressure in the rodless chamber 103 rapidly drops to... The effective hydraulic action area of ​​the rod cavity 102 is The effective hydraulic action area of ​​the rodless cavity 103 is The hydraulic pressure in the rod chamber 102 is greater than the sum of the hydraulic pressure in the rodless chamber 103 and the elastic force of the reset elastic element 104. Afterwards, the main valve core 101 begins to move away from the working port Po. During this movement, the effective hydraulic action area of ​​the rod chamber 102 changes from... Increase to until At this time, the main valve core 101 stops moving.

[0055] After the task is completed, refer to Figure 3 The ejector valve enters the reset process. The control system cancels the energizing command to the solenoid valve group 21, and the three solenoid valves are simultaneously de-energized and closed, cutting off the passage from the rodless chamber 103 to the return port T. At this time, the rodless chamber 103 becomes a closed cavity supplied with oil by the damping mechanism 22, and its pressure begins to rise. As the pressure in the rodless chamber 103 increases, the pressure in the first chamber 2223 of the on / off damping valve 222 also rises. When this pressure approaches the system pressure... At this time, the pressure difference across the on / off damping valve 222 gradually decreases and eventually disappears. The hydraulic pressure acting on the damping valve core 2221 is rebalanced, and the elastic force of the return spring 2222 becomes the dominant force, pushing the damping valve core 2221 to automatically return to the open position. The automatic opening of the on / off damping valve 222 provides a high-flow-rate pressurization channel for the rodless chamber 103. At this time, the high-pressure oil rapidly pressurizes the rodless chamber 103 through the two parallel channels of the fixed damping orifice 221 and the open on / off damping valve 222, quickly restoring its pressure to the system pressure. Inside the flow valve 10, as the pressure in the rodless chamber 103 rises, the force within the rodless chamber 103... The force rapidly increases, and together with the elastic force stored in the reset elastic element 104, it pushes the main valve core 101 upwards rapidly until it re-seals the working oil port Po, returning the ejector valve to its initial closed state. This process constitutes the reset method for accelerating the closure of the flow valve 10. Specifically, as... Figures 5 to 6 The diagram shows the automatic return process of the on / off damping valve 222 when the electromagnetic switch valve is fully closed. At the start of the return, the oil outlet 2225 is closed, and the effective hydraulic action area of ​​the first chamber 2223 is... The effective hydraulic action area of ​​the second chamber 2224 is The hydraulic pressure in the second chamber 2224 is greater than the sum of the hydraulic pressure in the first chamber 2223 and the elastic force of the reset elastic element, that is... As the on / off damping valve 222 returns to its original position, the oil outlet 2225 begins to open. After opening and during the movement of the damping valve core 2221, the effective hydraulic action area of ​​the first chamber 2223 and the second chamber 2224 is both... All pressures are system pressures. At this time, the sum of the hydraulic pressure in the first chamber 2223 and the elastic force of the return spring 2222 is greater than the hydraulic pressure in the second chamber 2224, that is... The damping valve returns to its initial position.

[0056] Furthermore, it should be noted that the damping mechanism 22 in this embodiment also provides a redundancy capability against contamination. In the initial closed state, if the fixed damping orifice 221 with a smaller diameter becomes clogged due to contaminants in the oil, the on / off damping valve 222, being normally open, can still provide an effective pressurization channel, ensuring that the rodless chamber 103 can establish and maintain a stable system pressure. This effectively prevents the risk of pressure imbalance in the rodless chamber 103 and accidental opening of the main valve core 101 due to blockage of the fixed damping hole 221.

[0057] Understandably, the design of the solenoid valve assembly 21 aims to address the single point of failure problem inherent in traditional single-pilot valve designs. In practical applications, one of the typical failure modes of solenoid valves is "stuck in the closed position," where the valve fails to open even after the user applies an energizing command.

[0058] In a partially redundant operating mode, suppose solenoid valve 201 malfunctions due to internal jamming or coil burnout, preventing it from opening in response to energizing commands. When the ejection mission is required, the control system simultaneously issues opening commands to all three solenoid valves in the solenoid valve group 21 according to the normal procedure. At this time, although solenoid valve 201 remains closed, solenoid valves 202 and 203 can be energized and opened normally. The oil in the rodless chamber 103 will flow to the return port for unloading through these two normally functioning solenoid valves. Although the total unloading flow area is reduced by one-third compared to when all three solenoid valves are fully open, sufficient flow capacity has been reserved for each solenoid valve in the design. The unloading rate of the two solenoid valves in parallel can usually still meet the system's core performance requirement for the flow valve opening time. Correspondingly, the pressure in the rodless chamber 103 can still drop rapidly, the on / off damping valve 222 closes normally, and the flow valve 10 can also open quickly, allowing the ejection mission to be successfully completed. This demonstrates the system's fault tolerance capability.

[0059] In a more stringent derating operation mode, assuming both solenoid valve 1 (201) and solenoid valve 2 (202) fail to open, only solenoid valve 3 (203) can open when the control system issues an opening command. In this case, the unloading task of the rodless chamber 103 is entirely undertaken by this single available solenoid valve 3 (203). The total unloading flow area is only one-third of normal, which significantly slows down the pressure drop rate in the rodless chamber 103 and significantly lengthens the opening response time of the main valve core 101. Although the dynamic performance of the flow valve 10 is reduced, as long as the flow capacity of a single solenoid valve is sufficient to unload the pressure in the rodless chamber 103 to below the threshold for opening the flow valve 10 within a certain time, the flow valve 10 can still be opened, thus completing the core ejection function. This operating mode, where performance is reduced but the basic task can still be completed, is called "derating operation." In many critical mission scenarios, derating operation is far better than complete functional loss.

[0060] The analysis of the two failure scenarios above shows that the use of parallel electromagnetic switching valve group 21 gives the pilot stage 20 strong redundancy. Even with the loss of two-thirds of the pilot unloading capacity, the system can still guarantee the realization of core functions, thereby greatly improving the mission reliability and safety of the entire catapult system and completely avoiding the risk of catastrophic consequences due to a single point of failure in the traditional single pilot valve design.

[0061] The present invention also provides a control method for an ejection valve of a missile pylon on a pilot-type aircraft with a switch array, wherein the ejection valve is any of the ejection valves described above, and the method includes the following steps:

[0062] When it is necessary to open the flow valve 10, at least one solenoid valve in the solenoid valve assembly 21 is opened to connect the rodless chamber 103 with the return port T for unloading; and

[0063] The pressure difference generated across the on / off damping valve 222 when the rodless chamber 103 is unloaded causes the on / off damping valve 222 to close automatically, thereby limiting the replenishment flow from the oil inlet P to the rodless chamber 103 and accelerating the opening of the flow valve 10.

[0064] Furthermore, it also includes a reset step:

[0065] When it is necessary to close the flow valve 10, the electromagnetic switch valve group 21 is closed, so that the pressure difference across the switch-type damping valve 222 disappears and it opens automatically, so that the rodless chamber 103 is pressurized through the fixed damping orifice 221 and the opened switch-type damping valve 222, thereby accelerating the closing of the flow valve 10.

[0066] The present invention has been further described above with reference to specific embodiments. However, it should be understood that the specific description herein should not be construed as limiting the nature and scope of the present invention. Various modifications made to the above embodiments by those skilled in the art after reading this specification are all within the scope of protection of the present invention.

Claims

1. A switch array lead aircraft missile pylon ejection valve characterized by, The system includes a flow valve and a pilot stage for controlling the flow valve. The flow valve includes a main valve body and a main valve core. The main valve core divides the cavity inside the main valve body into a rod chamber and a rodless chamber. A working oil port is opened in the rod chamber at a position directly opposite the valve core rod. The oil inlet is connected to the rod chamber. The pilot stage controls the axial movement of the main valve core, thereby controlling the on / off state between the oil inlet and the working oil port. The pilot stage includes an electromagnetic switching valve assembly and a damping mechanism; The inlet of the electromagnetic switch valve group is connected to the rodless chamber, and the outlet is connected to the oil return port. The electromagnetic switch valve group includes at least two electromagnetic switch valves arranged in parallel. The damping mechanism includes a fixed damping orifice and a switchable damping valve arranged in parallel. The inlet of the damping mechanism is connected to the oil inlet, and the outlet is connected to both the rodless cavity and the inlet of the electromagnetic switch valve. The switchable damping valve includes a damping valve body and a damping valve core axially movable within the damping valve body. The damping valve core divides the cavity within the damping valve body into a first chamber and a second chamber. An oil outlet and a first oil inlet are provided on the side wall of the first chamber, and a second oil inlet is provided on the side wall of the second chamber. Both the first and second oil inlets are connected to the oil inlet. The pressure difference across the switch-type damping valve is controlled by opening and closing the electromagnetic switch valve group. When all the electromagnetic switch valves are closed, the switch-type damping valve is normally open, and the working port of the flow valve is closed. When at least one of the electromagnetic switch valves is open, the switch-type damping valve is closed, and the working port of the flow valve is open.

2. The switch array lead aircraft missile rack ejection valve of claim 1, wherein, The damping valve core includes a piston body and a piston rod. The piston rod is located in the first chamber, and the oil outlet is directly opposite the piston rod. The axial movement of the piston rod controls the on / off state of the oil outlet and the first oil inlet. A return spring is fitted onto the piston rod, with its two ends abutting against the oil outlet and the piston body, respectively.

3. The switch array lead aircraft missile rack ejection valve of claim 2, wherein, In the initial state, all the electromagnetic switch valves are in the closed state. The effective hydraulic action area of ​​the first chamber is equal to that of the second chamber. When the pressure in the first chamber and the second chamber is the same, the reset spring drives the damping valve core away from the oil outlet. The oil outlet is connected to the first oil inlet. The switch-type damping valve is in the normally open state.

4. The switch array lead aircraft missile rack ejection valve of claim 1, wherein, The electromagnetic switch valve group consists of three electromagnetic switch valves connected in parallel, and the electromagnetic switch valves are two-position normally closed electromagnetic switch valves.

5. The switch array lead aircraft missile rack ejection valve of claim 2, wherein, The rodless chamber of the flow valve is also provided with a reset elastic element. One end of the reset elastic element is fixed to the bottom wall of the main valve core, and the other end is fixed to the bottom wall of the rodless chamber. In the initial state, when each of the electromagnetic switch valves is not energized, the effective hydraulic action area of ​​the rodless chamber is greater than that of the rod chamber; the pressure of the rod chamber is equal to that of the rodless chamber; the hydraulic pressure of the rodless chamber is greater than the sum of the hydraulic pressure of the rod chamber and the elastic force of the reset elastic element; and the main valve core seals the working oil port.

6. The switch array lead aircraft missile rack ejection valve of claim 5, wherein, The electromagnetic switch valve group consists of three electromagnetic switch valves connected in parallel. When in operation, the flow valve is open: at least one of the electromagnetic switch valves is open, causing the pressure in the first chamber to drop, the pressure in the second chamber to be the system pressure, the pressure in the second chamber to be greater than the pressure in the first chamber, and the hydraulic pressure in the second chamber to be greater than the sum of the hydraulic pressure in the first chamber and the spring force of the return spring, and the damping valve core moves toward the oil outlet until the oil outlet is blocked; The rod chamber of the flow valve is at the system pressure, and the pressure in the rodless chamber is less than the pressure in the rod chamber. This makes the hydraulic pressure in the rod chamber greater than the sum of the hydraulic pressure in the rodless chamber and the elastic force of the reset elastic element. The main valve core moves away from the working port and compresses the reset elastic element until it reaches the equilibrium position, and the oil inlet is connected to the working port.

7. The switch array lead aircraft missile rack ejection valve of claim 5, wherein, The electromagnetic switch valve group consists of three electromagnetic switch valves connected in parallel. When in operation, the flow valve resets: all three electromagnetic switch valves close simultaneously, the pressure in the first chamber rises to the system pressure, the pressure in the second chamber is the system pressure, and the hydraulic pressure in the second chamber is less than the sum of the hydraulic pressure in the first chamber and the elastic force of the reset spring. The damping valve core moves away from the oil outlet and opens the oil outlet. The rod chamber of the flow valve is at the system pressure, and the pressure in the rodless chamber rises to the system pressure. The hydraulic pressure in the rod chamber is less than the sum of the hydraulic pressure in the rodless chamber and the elastic force of the reset elastic element. The main valve core moves towards the working port to close the working port.

8. The switch array lead aircraft missile rack ejection valve of claim 2, wherein, With all the electromagnetic switch valves in the closed state and the fixed damping orifice blocked, the hydraulic pressure in the first chamber and the hydraulic pressure in the second chamber of the switch-type damping valve are the same. The damping valve core moves away from the oil outlet under the action of the return spring, and the switch-type damping valve is in the normally open state.

9. A control method for an ejection valve on a pilot aircraft missile pylon with a switch array, wherein the ejection valve is the ejection valve according to any one of claims 1-8, the method comprising the following steps: When it is necessary to open the flow valve, at least one electromagnetic switch valve in the electromagnetic switch valve group is opened to unload the rodless chamber through the opened electromagnetic switch valve. as well as The pressure difference generated across the switch-type damping valve during unloading of the rodless chamber causes the switch-type damping valve to close automatically, thereby limiting the replenishment flow from the oil inlet to the rodless chamber and accelerating the opening of the flow valve.

10. The method according to claim 9, characterized in that, It also includes a reset step: When it is necessary to close the flow valve, the electromagnetic switch valve assembly is closed, causing the pressure difference across the switch-type damping valve to disappear and automatically open. This allows the rodless chamber to be pressurized through the fixed damping orifice and the open switch-type damping valve, thereby accelerating the closing of the flow valve.

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