Switch array pilot aircraft missile pylon ejection valve and control method

Abstract

The invention belongs to the field of aircraft missile pylon ejection system control, and particularly relates to a switch array pilot aircraft missile pylon 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 forms a hydraulic half-bridge through a plurality of electromagnetic switch valves connected in parallel, a fixed damping hole and a switch type damping valve controlled by pressure difference. During working, when the electromagnetic switch valve is fully closed, the switch type damping valve is normally opened, and the flow valve is closed; any electromagnetic switch valve is opened, the switch type damping valve is closed under the action of differential pressure, and the flow valve is rapidly opened to supply oil. The redundant design that the multiple electromagnetic switch valves are connected in parallel is adopted, a traditional single pilot electromagnetic valve low in reliability is replaced, normal work under the condition that the single electromagnetic switch valve breaks down can be achieved, and the overall reliability of the system is remarkably improved. During ejection work, the drift diameter of the switch type damping valve is decreased under the action of differential pressure, it is guaranteed that a valve element of the flow valve is rapidly opened, and the response speed of the ejection valve is increased.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of aircraft missile rack ejection systems, in particular to a switch array pilot aircraft missile rack ejection valve and control method. BACKGROUND

[0002] In the application of aircraft missile rack ejection system and other aviation weapon launch, the rapid launch and low impact separation ability of the weapon system is put forward. The space of the aircraft is limited, the working environment is complex, and it needs to adapt to high frequency operation and rapid continuous combat rhythm, so the ejection system must have high reliability and dynamic response performance. In order to achieve this goal, the high pressure fluid control system as the core of ejection driving, its rapid response ability and long-term working reliability become the key technical index. In the prior art, the control mode of pilot valve driving main valve is generally adopted, the main valve is controlled by the rapid action of pilot valve, so as to realize the on-off control of high pressure fluid, and then drive the ejection mechanism to complete the launch of missile.

[0003] In the prior art, the common scheme is to use a single pilot electromagnetic valve to control the action of the main valve. However, this design has obvious reliability defects in the aviation environment. Since only a single pilot electromagnetic valve is relied on, the valve constitutes a single point failure link of the whole launch link. In the complex environment of high vibration, large temperature difference and electromagnetic interference faced by the aircraft, the pilot electromagnetic valve is prone to failure due to sticking, wear, coil failure and other reasons, so that the main valve cannot normally respond to the control signal, block the delivery of high pressure fluid to the ejection cylinder, and cause the missile launch failure. This not only affects the completion of single task, but also may interfere with the combat rhythm and task continuity. In addition, the dynamic response performance of the existing pilot valve is also difficult to meet the demand of rapid and continuous launch of modern aviation weapons, limited by the inertia of electromagnetic valve core movement and inductance delay, the main valve opening and closing exists response lag, which is not conducive to realize the precise time sequence launch of multiple missiles and the safety of the aircraft.

[0004] Therefore, in view of the higher requirements of aircraft missile rack ejection system in complex aviation environment on reliability, environmental adaptability and launch response speed, it is urgent to develop a pilot control scheme that can adapt to airborne conditions, has high reliability and fast dynamic response, which is a technical problem to be solved in the field. SUMMARY

[0005] The purpose of the present application 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 single pilot valve, and to provide a switch array pilot aircraft missile rack ejection valve and control method which can avoid single point failure risk and improve the opening and reset response speed.

[0006] The first aspect of the present application provides a switch array pilot aircraft missile rack ejection valve, comprising a flow valve and a pilot stage for controlling the flow valve, the flow valve comprising a main valve body and a main valve core, the main valve core separating a cavity in the main valve body into a rod cavity and a rodless cavity, the rod cavity being provided with a working oil port opposite the valve core rod, and an oil inlet being in communication with the rod cavity, the pilot stage controlling axial movement of the main valve core, and the axial movement of the main valve core controlling the on-off state between the oil inlet and the working oil port;

[0007] The pilot stage comprises an electromagnetic on-off valve group and a damping mechanism.

[0008] The inlet of the electromagnetic on-off valve group is in communication with the rodless cavity, and the outlet is in communication with the oil return port, the electromagnetic on-off valve group comprising at least two parallelly arranged electromagnetic on-off valves.

[0009] The damping mechanism comprises a fixed damping hole and a switch type damping valve arranged in parallel, the inlet of the damping mechanism being in communication with the oil inlet, and the outlet being in communication with the rodless cavity and the inlet of the electromagnetic on-off valve; the switch type damping valve comprising a damping valve body and a damping valve core axially movably arranged in the damping valve body; the damping valve core separating a cavity in the damping valve body into a first chamber and a second chamber, the side wall of the first chamber being provided with an oil outlet and a first oil inlet, and the side wall of the second chamber being provided with a second oil inlet, the first oil inlet and the second oil inlet being in communication with the oil inlet.

[0010] The pressure difference across the switch type damping valve is controlled by the opening and closing of the electromagnetic on-off valve group, when each electromagnetic on-off valve is in the closed state, the switch type damping valve is in the normally open state, and the working oil port of the flow valve is in the closed state; when at least one electromagnetic on-off valve is opened, the switch type damping valve is in the closed state, and the working oil port of the flow valve is in the open state.

[0011] Further, the damping valve core comprises a piston body and a piston rod, the piston rod being located in the first chamber, and the oil outlet being arranged opposite the piston rod, axial movement of the piston rod controlling the on-off state of the oil outlet and the first oil inlet.

[0012] A return spring is sleeved on the piston rod, and the two ends of the return spring abut against the oil outlet and the piston body, respectively.

[0013] Further, in the initial state, each electromagnetic on-off valve is in the closed state, the effective hydraulic action area of the first chamber is equal to that of the second chamber, and under the condition that the pressures in the first chamber and the second chamber are the same, the return spring drives the damping valve core away from the oil outlet, the oil outlet is in communication with the first oil inlet, and the switch type damping valve is in the normally open state.

[0014] Further, the electromagnetic on-off valve group comprises three parallelly arranged electromagnetic on-off valves, and the electromagnetic on-off valves are two-position two-normal closed electromagnetic on-off valves.

[0015] Further, a reset elastic member is arranged in the rodless cavity of the flow valve, one end of the reset elastic member is fixed to the bottom wall of the main valve core, and the other end is fixed to the bottom wall of the rodless cavity.

[0016] In the initial state, the effective hydraulic acting area of the rodless cavity is greater than that of the rod cavity when the electromagnetic switch valve is not energized, the pressure of the rod cavity is equal to that of the rodless cavity, the hydraulic pressure of the rodless cavity is greater than the sum of the hydraulic pressure of the rod cavity and the elastic force of the reset elastic member, and the main valve core seals the working oil port.

[0017] Further, the electromagnetic switch valve group is composed of three parallel electromagnetic switch valves.

[0018] In the working state, the flow valve is opened, at least one of the electromagnetic switch valves is opened, the pressure of the first chamber is reduced, the pressure of the second chamber is the system pressure, the pressure of the second chamber is greater than that of the first chamber, the hydraulic pressure of the second chamber is greater than the sum of the hydraulic pressure of the first chamber and the elastic force of the reset spring, the damping valve core moves towards the oil outlet hole, and the damping valve core moves towards the oil outlet hole until the oil outlet hole is blocked.

[0019] The rod cavity of the flow valve is the system pressure, the pressure of the rodless cavity is less than that of the rod cavity, the hydraulic pressure of the rod cavity is greater than the sum of the hydraulic pressure of the rodless cavity and the elastic force of the reset elastic member, the main valve core moves away from the working oil port and compresses the reset elastic member, and the main valve core moves away from the working oil port until the balance position, and the oil inlet port is communicated with the working oil port.

[0020] Further, the electromagnetic switch valve group is composed of three parallel electromagnetic switch valves.

[0021] In the working state, the flow valve is reset, when the three electromagnetic switch valves are closed at the same time, the pressure of the first chamber rises to the system pressure, the pressure of the second chamber is the system pressure, and the hydraulic pressure of the second chamber is less than the sum of the hydraulic pressure of the first chamber and the elastic force of the reset spring, the damping valve core moves away from the oil outlet hole, and the damping valve core moves away from the oil outlet hole to open the oil outlet hole.

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

[0023] The second aspect of the present application is to provide a control method of a switch array pilot aircraft missile suspension launcher ejection valve, the ejection valve is any one of the above ejection valves, and the method comprises the following steps:

[0024] When the flow valve needs to be opened, at least one of the electromagnetic switch valves in the electromagnetic switch valve group is opened to unload the rodless cavity through the opened electromagnetic switch valve; and

[0025] The pressure difference generated at both ends of the on-off type damping valve when the rodless cavity is unloaded makes the on-off type damping valve automatically close, so as to limit the oil supplement flow from the oil inlet to the rodless cavity and accelerate the opening of the flow valve.

[0026] Further, the method further comprises a resetting step:

[0027] When the flow valve needs to be closed, the electromagnetic on-off valve group is closed, so that the pressure difference at both ends of the on-off type damping valve disappears and the on-off type damping valve is automatically opened, so as to jointly charge the rodless cavity through the fixed damping hole and the opened on-off type damping valve, and accelerate the closing of the flow valve.

[0028] Compared with the prior art, the present application has the following beneficial effects:

[0029] (1) The present application adopts at least two, preferably three, parallel electromagnetic on-off valves to form a redundant pilot stage, replacing the traditional single pilot electromagnetic valve. When a single or even two electromagnetic on-off valves fail to open, the remaining healthy electromagnetic on-off valve can still perform the unloading function on the rodless cavity of the flow valve, ensuring that the system can continue to work or operate at reduced capacity, thereby avoiding the problem of complete loss of the entire ejection function due to a single point failure, and significantly improving the overall reliability and task success rate of the system.

[0030] (2) The present application sets a dynamic damping mechanism composed of a fixed damping hole and an on-off type damping valve in parallel, which realizes intelligent adjustment of the damping of the pilot oil way. When the ejection is working, i.e. the flow valve is opened, the on-off type damping valve is automatically closed due to the pressure difference at both ends, effectively limiting the oil supplement flow to the rodless cavity of the flow valve, thereby accelerating the opening speed of the flow valve; when the flow valve is reset, the on-off type damping valve is automatically opened, increasing the channel for charging the rodless cavity, and significantly accelerating the closing speed of the flow valve. This design optimizes the bidirectional dynamic response characteristics of the flow valve. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0032] Figure 1 The hydraulic control system principle diagram of the ejection valve provided by an embodiment of the present application;

[0033] Figure 2 The structural schematic diagram of the on-off type damping valve provided by an embodiment of the present application;

[0034] Figure 3The working principle diagram of the ejector valve in the closing state according to an embodiment of the present application is shown in the figure;

[0035] Figure 4 The working principle diagram of the ejector valve in the opening process according to an embodiment of the present application is shown in the figure;

[0036] Figure 5 The closing position diagram of the on-off type damping valve according to an embodiment of the present application is shown in the figure; Figure 6 The opening position diagram of the on-off type damping valve according to an embodiment of the present application is shown in the figure; Figure 7 The closing position diagram of the flow valve according to an embodiment of the present application is shown in the figure; Figure 8 The opening position diagram of the flow valve according to an embodiment of the present application is shown in the figure.

[0037] Wherein: 10-flow valve; 101-main valve core; 102-rod cavity; 103-rodless cavity; 104-reset elastic member; 20-pilot stage; 21-electromagnetic switch valve group; 201-electromagnetic switch valve one; 202-electromagnetic switch valve two; 203-electromagnetic switch valve three; 22-damping mechanism; 221-fixed damping hole; 222-on-off type damping valve; 2221-damping valve core; 22211-piston body; 22212-piston rod; 2222-reset spring; 2223-first cavity; 2224-second cavity; 2225-oil outlet hole; 2226-first oil inlet hole; 2227-second oil inlet hole; P-oil inlet; Po-working oil port; T-oil return port. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0039] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application. Figure 1 to the drawings in the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application. Figure 8 The present application is described in detail below with reference to the drawings and specific embodiments.

[0040] Reference is made to Figures 1 to 8The application provides a switch array pilot aircraft missile suspension rack ejection valve, which comprises a flow valve 10 and a pilot stage 20 for controlling the flow valve 10. The flow valve 10 serves as a main body for executing high-pressure fluid on-off, and comprises a main valve body and a main valve core 101 capable of axially sliding in the main valve body. The main valve core 101 divides a cavity in the main valve body into a rod cavity 102 and a rodless cavity 103. High-pressure fluid enters the system from an oil inlet P, and an oil passage of the oil inlet P is directly communicated with the rod cavity 102, so that the rod cavity 102 always bears system pressure . A working oil port Po is formed in a position opposite to the valve core rod in the rod cavity 102, and axial movement of the main valve core 101 can accurately control the fluid passage between the oil inlet P and the working oil port Po to be in a communication state or a cut-off state. In order to realize reliable closing and resetting, a reset elastic member 104 (for example, a compression spring) is arranged in the rodless cavity 103. One end of the reset elastic member 104 abuts against an end surface of the main valve core 101, and the other end abuts against a cavity bottom wall of the rodless cavity 103, so as to always provide an elastic pre-tightening force of the main valve core 101 to the closing position. A key structure is that, in an initial state (that is, a state in which the working oil port is closed), an effective hydraulic acting area (denoted as ) of the rodless cavity 103 is designed to be greater than an effective hydraulic acting area (denoted as ) of the rod cavity 102. The area difference is the basis for realizing hydraulic control of the flow valve 10, that is, when the pressures of the two cavities are equal, the hydraulic pressure generated by the rodless cavity 103 will be greater than the hydraulic pressure generated by the rod cavity 102.

[0041] The pilot stage 20 serves as a core control part of the application, and its function is to accurately and quickly adjust the pressure in the rodless cavity 103, thereby indirectly controlling the movement of the main valve core 101. The pilot stage 20 comprises an electromagnetic switch valve group 21 and a damping mechanism 22.

[0042] The electromagnetic switch valve group 21 comprises at least two parallelly arranged electromagnetic switch valves. As a preferred embodiment, the electromagnetic switch valve group 21 is composed of three parallelly arranged electromagnetic switch valves, namely electromagnetic switch valve one 201, electromagnetic switch valve two 202 and electromagnetic switch valve three 203. The three electromagnetic switch valves are all two-position two-typical closed electromagnetic switch valves. A common inlet of the electromagnetic switch valve group 21 is communicated with the rodless cavity 103 of the flow valve 10, and a common outlet thereof is communicated with a return oil port T of the system. When the electromagnetic switch valve group 21 is powered off, for example, when the three electromagnetic switch valves are all in the closed position, the passage from the rodless cavity 103 to the return oil port T is cut off. When the electromagnetic switch valve group 21 is powered on, for example, when any one of the electromagnetic switch valves is opened, a low-resistance unloading channel of the rodless cavity 103 to the return oil port T is provided. The parallel design of the three electromagnetic switch valves of the application aims to constitute redundant control, thereby significantly improving the reliability of the pilot unloading function.

[0043] The damping mechanism 22 is arranged between the oil inlet port P and the rodless chamber 103, and is used to provide controlled oil supplement for the rodless chamber 103. The damping mechanism 22 includes a fixed damping hole 221 and a switch-type damping valve 222 arranged in parallel, wherein the fixed damping hole 221 is a throttle hole with a fixed small diameter, which always provides a flow-restricted oil supplement path from the oil inlet port to the rodless chamber 103. The switch-type damping valve 222 is a passive valve capable of automatically changing the on-off state in response to the pressure difference between the two ends.

[0044] The inlet of the damping mechanism 22 is in communication with the oil inlet port P, and the outlet is in communication with the rodless chamber 103 and the inlet of the electromagnetic switch valve group 21; refer to Figure 2 The switch-type damping valve 222 includes a damping valve body and a damping valve spool 2221 arranged axially movably in the damping valve body; the damping valve spool 2221 separates the cavity in the damping valve body into a first chamber 2223 and a second chamber 2224, the side wall of the first chamber 2223 is provided with an oil outlet hole 2225 in communication with the rodless chamber 103 and a first oil inlet hole 2226 in communication with the oil inlet port P, and the side wall of the second chamber 2224 is provided with a second oil inlet hole 2227 in communication with the oil inlet port P. Therefore, the first oil inlet hole 2226 and the second oil inlet hole 2227 are both in communication with the oil inlet port P, so that the second chamber 2224 always bears the system pressure, and the pressure of the first chamber 2223 depends on the pressure of the rodless chamber 103 connected by the oil outlet hole 2225.

[0045] In this application, the opening and closing of the switch-type damping valve 222 is controlled by the pressure difference between the two ends. In the initial state, when each electromagnetic switch valve is in the closed state, the switch-type damping valve 222 is in the open state, and the working oil port Po of the flow valve 10 is in the closed state; when at least one electromagnetic switch valve is opened, the switch-type damping valve 222 is in the closed state, and the working oil port Po of the flow valve 10 is in the open state, that is, the working oil port Po is in communication with the oil inlet port P.

[0046] The present application replaces the traditional single pilot electromagnetic valve with three parallel electromagnetic switch valves to form a redundant pilot stage. When a single or even two electromagnetic switch valves fail to open, the remaining healthy electromagnetic switch valve can still complete the unloading function of the rodless chamber 103 of the flow valve 10, ensuring that the system can continue to work or operate at a reduced capacity, thereby avoiding the problem of complete loss of ejection function due to a single point failure, and significantly improving the overall reliability and mission success rate of the system. In addition, by setting a dynamic damping mechanism 22 composed of a fixed damping hole 221 and a switch-type damping valve 222 in parallel, intelligent adjustment of the damping of the pilot oil circuit is achieved. When the ejection is working, i.e., the flow valve 10 is open, the switch-type damping valve 222 is automatically closed due to the pressure difference between the two ends, effectively limiting the oil supply flow of the rodless chamber 103 of the flow valve 10, thereby accelerating the opening speed of the flow valve 10; when the flow valve 10 is reset, the switch-type damping valve 222 is automatically opened, increasing the channel for charging the rodless chamber 103, and significantly accelerating the closing speed of the flow valve 10. This design optimizes the bidirectional dynamic response characteristics of the flow valve 10.

[0047] Further, referring to Figure 2 , the damping valve core 2221 is specifically designed as a structure including a piston body 22211 and a piston rod 22212, the piston rod 22212 is located in the first chamber 2223, and the oil outlet hole 2225 is arranged opposite to the piston rod 22212, the inner diameter of the oil outlet hole 2225 matches the outer diameter of the piston rod 22212, and the piston rod 22212 can move axially to block or open the oil outlet hole 2225, thereby controlling the on-off of the first oil inlet hole 2226 and the oil outlet hole 2225. A reset spring 2222 is sleeved on the piston rod 22212, and the two ends of the reset spring 2222 abut against the inner wall of the valve body around the oil outlet hole 2225 and the piston body 22211, respectively. The reset spring 2222 provides a force that tends to open the oil outlet hole 2225. When the hydraulic pressures in the first chamber 2223 and the second chamber 2224 are the same, the reset spring 2222 drives the damping valve core 2221 away from the oil outlet hole 2225, and the oil outlet hole 2225 is in communication with the first oil inlet hole 2226. In this embodiment, the switch-type damping valve 222 is in a normally open state, and the effective hydraulic acting area of the first chamber 2223 and the effective hydraulic acting area of the second chamber 2224 are designed to be equal.

[0048] Further, in the initial state, the effective hydraulic acting area of the rodless chamber 103 is greater than the effective hydraulic acting area of the rod chamber 102; when each electromagnetic switch valve is not energized, the pressure of the rod chamber 102 and the pressure of the rodless chamber 103 are equal, and are both the system pressure Under the action of the hydraulic pressure of the rodless chamber 103 and the elastic force of the reset elastic member 104, the main valve core 101 seals the working oil port Po.

[0049] 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.

[0050] 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 , ; in the open state of the oil outlet hole 2225, and during the movement of the damping spool 2221, the effective hydraulic acting area of the first chamber 2223 and the second chamber 2224 are , , the initial position of the damping spool 2221 moving to the open state.

[0051] When the ejection task needs to be performed, the ejection valve enters the open state, as shown in Figure 4 . The control system simultaneously applies energization instructions to the three electromagnetic on-off valves in the electromagnetic on-off valve group 21, and the three electromagnetic on-off valves are simultaneously opened, rapidly connecting the rodless chamber 103 with the oil return port T. Since the total flow area of the unloading channel is large, the oil in the rodless chamber 103 is rapidly discharged, and its pressure rapidly drops from the system pressure to a low pressure close to the pressure of the oil return port T . The sudden drop in pressure has a significant impact on the damping mechanism 22: specifically, the pressure of the second chamber 2224 of the on-off type damping valve 222 is still , while the pressure of the first chamber 2223 drops to . Since , a strong hydraulic pressure much larger than that of 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, thereby driving the damping spool 2221 to rapidly move towards the oil outlet hole 2225 until the piston rod 22212 end of the damping spool 2221 completely blocks the oil outlet hole 2225. At this time, 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, . At this time, the elastic force of the return spring 2222 is , and the effective hydraulic acting area when the oil outlet hole 2225 is closed, so that the on-off type damping valve 222 automatically closes. In this way, the large-flow oil supplement channel from the oil inlet port P to the rodless chamber 103 is cut off, and oil supplement is only performed through the fixed damping hole 221 with a smaller passage diameter. This design greatly limits the oil supplement flow, thereby significantly accelerating the unloading process of the rodless chamber 103. At the same time, in the flow valve 10, the force state of the main spool 101 is fundamentally reversed. The thrust in the rod chamber 102 remains unchanged, while the thrust in the rodless chamber 103 becomes and the elastic force of the return spring 104 . Since is low, the is much larger than The huge net opening force drives the main valve core 101 to overcome the resistance, move quickly downward and compress the reset elastic member 104, until a new force balance position is reached. In this process, the passage between the oil inlet P and the working oil port Po is opened, and high-pressure oil is output from the working oil port Po to drive the subsequent ejection mechanism to act. This series of actions constitutes a control method for using the pressure difference generated across the on-off type damping valve 222 when the unrod chamber 103 is unloaded to automatically close it to limit the oil replenishment flow, thereby accelerating the opening of the flow valve 10. Specifically, Figures 7 to 8 is the process of starting pressure relief to completing pressure relief of the electromagnetic on-off valve group, when starting pressure relief, the pressure in the unrod chamber 103 rapidly decreases to , the effective hydraulic acting area of the rod chamber 102 is , the effective hydraulic acting area of the unrod chamber 103 is , the hydraulic pressure of the rod chamber 102 is greater than the sum of the hydraulic pressure of the unrod chamber 103 and the elastic force of the reset elastic member 104, that is , then the main valve core 101 starts to move away from the working oil port Po, and during the movement process, the effective hydraulic acting area of the rod chamber 102 increases from to , until , the main valve core 101 stops moving.

[0052] After the task is completed, refer to Figure 3 , the ejection valve enters the reset process. The control system cancels the energization instruction of the electromagnetic on-off valve group 21, and the three electromagnetic on-off valves are simultaneously de-energized and closed, cutting off the path from the unrod chamber 103 to the oil return port T. At this time, the unrod chamber 103 becomes a closed cavity supplied with oil by the damping mechanism 22, and its pressure starts to rise. With the increase of the pressure in the unrod chamber 103, the pressure in the first chamber 2223 of the on-off type damping valve 222 also rises. When the pressure approaches the system pressure , the pressure difference across the on-off type damping valve 222 gradually decreases or even disappears. The hydraulic pressure acting on the damping valve core 2221 is rebalanced, and the elastic force of the reset spring 2222 becomes the dominant force, pushing the damping valve core 2221 to automatically reset to the open position. The automatic opening of the on-off type damping valve 222 provides a large-flow pressure charging channel for the unrod chamber 103. At this time, high-pressure oil passes through the two parallel paths of the fixed damping hole 221 and the opened on-off type damping valve 222, and together quickly charges the unrod chamber 103 to rapidly restore its pressure to the system pressure . Inside the flow valve 10, with the rise of the pressure in the unrod chamber 103, the force The main valve core 101 is pushed to move upward rapidly, until the working oil port Po is resealed, and the ejection valve returns to the initial closed state. This process constitutes the reset method of the acceleration flow valve 10 closing. Specifically, as shown in Figures 5 to 6 The automatic return process of the on-off type damping valve 222 when the electromagnetic on-off valve is fully closed is shown. When the return starts, the oil outlet hole 2225 is in a closed state, the effective hydraulic acting area of the first chamber 2223 is , the effective hydraulic acting area of the second chamber 2224 is , the hydraulic pressure of the second chamber 2224 is greater than the sum of the hydraulic pressure of the first chamber 2223 and the elastic force of the reset spring, that is ; as the on-off type damping valve 222 returns, the oil outlet hole 2225 begins to open, and after opening and during the movement of the damping valve core 2221, the effective hydraulic acting areas of the first chamber 2223 and the second chamber 2224 are both , the pressures are both the system pressure , and at this time, the sum of the hydraulic pressure of the first chamber 2223 and the elastic force of the reset spring 2222 is greater than the hydraulic pressure of the second chamber 2224, that is , the damping valve returns to the initial state.

[0053] In addition, it should be noted that the design of the damping mechanism 22 of the present embodiment also provides a redundant anti-pollution capability. In the initial closed state, if the fixed damping hole 221 with a small diameter is blocked by pollutants in the oil, since the on-off type damping valve 222 is in the normally open state at this time, it can still provide an effective charging channel to ensure that the no-lever chamber 103 can establish and maintain a stable system pressure , thereby effectively preventing the risk of pressure imbalance in the no-lever chamber 103 and accidental opening of the main valve core 101 due to the blockage of the fixed damping hole 221.

[0054] It can be understood that the design of the electromagnetic on-off valve group 21 aims to solve the single-point failure problem existing in the traditional single-pilot valve design. In actual application, one of the typical failure modes of the electromagnetic on-off valve is "stuck in the closed position", that is, even if the user issues a power-on command, the valve cannot be opened.

[0055] In a partial redundancy mode scenario, assume that the electromagnetic on-off valve one 201 fails due to internal sticking or coil burnout, causing it to fail to open in response to energization commands. When the ejection task needs to be executed, the control system sends open commands to the three electromagnetic on-off valves in the electromagnetic on-off valve group 21 simultaneously according to the normal program. At this time, although the electromagnetic on-off valve one 201 remains closed, the electromagnetic on-off valve two 202 and the electromagnetic on-off valve three 203 can be normally energized and opened. The oil in the rodless chamber 103 will flow to the oil return port through the two normally operating electromagnetic on-off valves for unloading. Although the total unloading flow area is reduced by one-third compared to when all three electromagnetic on-off valves are fully open, the unloading rate of the two electromagnetic on-off valves in parallel usually still meets the core performance index requirements of the system for the opening time of the flow valve, because sufficient flow capacity has been reserved for each electromagnetic on-off valve in the design. Accordingly, the pressure in the rodless chamber 103 can still be quickly reduced, the on-off type damping valve 222 is normally closed, the flow valve 10 can be quickly opened, and the ejection task is successfully completed. This is an embodiment of the fault tolerance capability of the system.

[0056] In another more severe reduced capacity operation mode scenario, assume that the electromagnetic on-off valve one 201 and the electromagnetic on-off valve two 202 both fail to open. When the control system sends an open command, only the electromagnetic on-off valve three 203 can work normally and open. At this time, the unloading task of the rodless chamber 103 is entirely borne by the only available electromagnetic on-off valve three 203. The total unloading flow area is only one-third of the normal situation, which will cause the pressure drop rate of the rodless chamber 103 to slow down significantly, and the opening response time of the main valve core 101 will also be significantly lengthened. Although the dynamic performance of the flow valve 10 is reduced, as long as the flow capacity of a single electromagnetic on-off valve is sufficient to unload the pressure in the rodless chamber 103 to below the threshold value for opening the flow valve 10 within a certain time, the flow valve 10 can still be opened eventually, thereby completing the most core ejection function. This working mode, in which the performance is reduced but the basic task can still be completed, is called "reduced capacity operation". In many critical task scenarios, being able to operate at reduced capacity is much better than losing all functionality.

[0057] From the analysis of the above two failure scenarios, it can be seen that the use of the parallel electromagnetic on-off valve group 21 enables the pilot stage 20 to have strong redundancy capability. Even if two-thirds of the pilot unloading capacity is lost, the system can still ensure the realization of the core function, thereby greatly improving the task reliability and safety of the entire ejection system, and completely avoiding the risk of catastrophic consequences caused by a single point failure in the traditional single pilot valve design.

[0058] The present application also provides a control method for a switch array pilot aircraft missile launcher ejection valve, the ejection valve being any one of the ejection valves described above, the method comprising the following steps:

[0059] When it is needed to open the flow valve 10, at least one of the electromagnetic switch valves in the electromagnetic switch valve group 21 is opened to communicate the rodless cavity 103 with the oil return port T for unloading; and

[0060] The pressure difference generated between the switch type damping valve 222 when the rodless cavity 103 is unloaded makes the switch type damping valve 222 automatically close to limit the oil supplement flow from the oil inlet port P to the rodless cavity 103, so as to accelerate the opening of the flow valve 10.

[0061] Further, the method further comprises a reset step:

[0062] When it is needed to close the flow valve 10, the electromagnetic switch valve group 21 is closed, so that the pressure difference between the switch type damping valve 222 disappears and the switch type damping valve 222 automatically opens to jointly charge the rodless cavity 103 through the fixed damping hole 221 and the opened switch type damping valve 222, so as to accelerate the closing of the flow valve 10.

[0063] The above has further described the present application by means of specific embodiments, but it should be understood that the specific description herein should not be understood as the limitation of the essence and scope of the present application, and various modifications made to the above embodiments by the ordinary skilled in the art after reading the present specification all belong to the scope protected by the present application.

Claims

1. A switch array pilot aircraft missile pylon ejection valve, characterized in that, 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 ejection valve for a pilot aircraft missile rack with a switch array according to claim 1, characterized in that, 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 ejection valve for a pilot aircraft missile rack with a switch array according to claim 2, characterized in that, 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 ejection valve for a pilot aircraft missile pylon of the switch array according to claim 1, characterized in that, 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 ejection valve for a pilot aircraft missile pylon of the switch array according to claim 2, characterized in that, 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 ejection valve for a pilot aircraft missile pylon of the switch array according to claim 5, characterized in that, 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 ejection valve for a pilot aircraft missile pylon of the switch array according to claim 5, characterized in that, 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 ejection valve for a pilot aircraft missile pylon of the switch array according to claim 2, characterized in that, 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, and the method comprises 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 on / off damping valve during unloading of the rodless chamber is used to automatically close the on / off damping valve, 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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