Integrated multi-stage flow cut-off device

Abstract

The invention belongs to the field of product mechanical structure design, and discloses an integrated multistage flow cut-off device which comprises a main valve assembly, a small-flow electromagnetic valve, a medium-flow electromagnetic valve, a small-flow actuating assembly and a medium-flow actuating assembly. Wherein one pipeline is controlled to be connected and disconnected through the small-flow actuating assembly, and the other pipeline is controlled to be connected and disconnected through the medium-flow actuating assembly. The small-flow electromagnetic valve controls a channel of the small-flow actuating assembly to be connected or disconnected, and the medium-flow electromagnetic valve controls a channel of the medium-flow actuating assembly to be connected or disconnected. A graded flow control scheme is adopted, an instruction from the inerting system controller is received, the nitrogen-rich gas flow mode of the inerting system is adjusted by switching on and off of the electromagnetic valve, the nitrogen-rich gas flow modes are automatically switched into the small flow mode, the medium flow mode and the large flow mode or the gas flow is cut off, and the different flow requirements of the fuel tank for the nitrogen-rich gas in all the flight stages are met.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of product mechanical structure design, and relates to an electrically-controlled pneumatic integrated multi-stage flow cut-off device of a civil aircraft inerting system, in particular to an integrated multi-stage flow cut-off device. BACKGROUND

[0002] After the fuel of an aircraft is consumed, the cavity of the fuel tank is enlarged, and the inerting system reduces the oxygen concentration by dynamically supplementing inert gas such as nitrogen-rich gas to the fuel tank, so that the fuel vapor cannot be combusted, and the oxygen concentration is usually controlled to be below 12%, so as to ensure that the fuel tank maintains a safe oxygen concentration level. The multi-stage flow cut-off device is the core control component for regulating and safely protecting the inert gas flow of the inerting system, realizes switching and emergency cut-off of the inert gas flow, and accurately controls the gas flow, reduces air consumption and system weight, and optimizes the efficiency of engine bleed air.

[0003] Most of the conventional flow cut-off devices are high-flow valves and small-flow valves used in parallel, and the integration degree is low, the response is slow, and the weight and volume are large, which cannot meet the requirements of the main machine for lightweight and small volume products. In order to meet the use requirements of the civil aircraft inerting system, the multi-stage flow cut-off device needs to be designed into an integrated structure with high precision, small volume and light weight, so as to meet the system requirements.

[0004] The multi-stage flow cut-off device in the civil aircraft inerting system is provided by a foreign civil aircraft matching manufacturer, and is in a monopolized position in the civil aircraft industry. Domestic researches are mostly concentrated on the design of single valves in parallel, the integration degree is low, and the research on the coordinated control of multi-stage flow is still in the initial exploration stage. With the development of domestic civil aircraft models, there is an urgent need to independently develop a multi-stage flow cut-off device. Through the design of the multi-stage flow cut-off device, the oxygen concentration and pressure control are optimized, the size of the air separator is reduced, and the cost and weight are reduced. SUMMARY

[0005] In order to solve the above problems, the present application provides an integrated multi-stage flow cut-off device, which has the advantages of fast response, high precision, small volume, light weight, safe and reliable quality, and fast cut-off.

[0006] The technical scheme of the present application is as follows: An integrated multi-stage flow cut-off device, comprising a main valve assembly, a small-flow electromagnetic valve, a medium-flow electromagnetic valve, a small-flow actuating assembly and a medium-flow actuating assembly, two pipelines are arranged in parallel between the inlet and outlet of the main valve assembly, one of the pipelines is controlled to be turned on or turned off by the small-flow actuating assembly, and the other pipeline is controlled to be turned on or turned off by the medium-flow actuating assembly; the small-flow electromagnetic valve controls the connection or closing of the passage of the small-flow actuating assembly, and the medium-flow electromagnetic valve controls the connection or closing of the passage of the medium-flow actuating assembly.

[0007] Further, the main valve assembly is a parallel structure with integrated double throttling seats, two throttling seats correspond to two parallel pipelines respectively, one pipeline is a small flow channel, the other pipeline is a medium flow channel, the pipe diameter of the medium flow channel is larger than that of the small flow channel; the throttling seat is arranged in the middle of the pipeline, and the throttling of the throttling seat will cause the pipeline corresponding to the throttling seat to be blocked Further, the main valve assembly is a parallel structure with integrated double throttling seats, two throttling seats correspond to two parallel pipelines respectively, one pipeline is a small flow channel, the other pipeline is a medium flow channel, the pipe diameter of the medium flow channel is larger than that of the small flow channel; the throttling seat is arranged in the middle of the pipeline, and the throttling of the throttling seat will cause the pipeline corresponding to the throttling seat to be blocked

[0008] Further, the small flow actuating assembly and the medium flow actuating assembly are the same in structure except that the flow rates are different; the small flow electromagnetic valve and the medium flow electromagnetic valve are the same in structure except that the flow rates are different.

[0009] Further, the small flow actuating assembly includes a piston, the piston separates the cylinder body of the actuating assembly into a closing cavity and an opening cavity, a lower rod body of the piston extends out of the opening cavity, a lower end of the lower rod body is provided with a valve matched with the throttling seat, a fixed spring seat is arranged in the middle of the closing cavity, a spring is arranged between the spring seat and the piston, and an upper rod body of the piston is limited in the radial direction by a small guide ring in the spring seat.

[0010] Further, the opening cavity is connected with the pipeline communicating with the throttling seat inlet through a control pipeline, and the opening and closing of the control pipeline are controlled by the small flow electromagnetic valve.

[0011] Further, the small flow electromagnetic valve controls the opening and closing of the control pipeline through a telescopic ball, and the control pipeline is also provided with an exhaust hole; when the small flow electromagnetic valve closes the control pipeline, the opening cavity is communicated with the exhaust hole.

[0012] Further, the small flow actuating assembly further includes a micro switch, the micro switch is mounted on a section of the upper rod body of the piston extending out of the spring seat, and when the small flow actuating assembly is in the opening or closing state, the upper position or the lower position of the piston drives the micro switch to touch other structures; the micro switch is signal-connected to an external host computer, and the external host computer obtains the current opening and closing state of the small flow actuating assembly according to the signal of the micro switch.

[0013] The technical effects of the present application are as follows: 1. The integrated design, fast response, small size, light weight, stable and reliable quality of the present application make the product meet the demand of civil aircraft inerting system.

[0014] 2. The present application adopts a hierarchical flow control scheme, receives instructions from the inerting system controller, adjusts the flow mode of the rich nitrogen gas of the inerting system by switching the on-off electricity of the electromagnetic valve, and automatically switches to small, medium and large flow modes or cuts off the gas flow. Meet the different flow requirements of the fuel tank for rich nitrogen gas in each flight stage.

[0015] 3, The application utilizes the outlet air pressure of the electromagnetic valve to drive the piston movement, and the spring resets to cut off the flow of the throttle seat when power off. The electromagnetic valve can switch the air path on and off within 2s, ensuring the rapid switching of the air path of the device.

[0016] 4, The small-flow throttle seat and the medium-flow throttle seat are integrated in the main valve body in the form of plug-in, and can be individually detached and maintained, which improves the maintainability of the device and reduces the maintenance cost. The flow precision is improved by controlling the machining precision of the throttle hole. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the application, the drawings needed to be used in the embodiments of the application will be briefly introduced as follows. Obviously, the drawings described below are only some embodiments of the application, and other drawings can also be obtained according to these drawings without creative labor for those skilled in the art.

[0018] Figure 1 is the schematic diagram of the embodiment of the application.

[0019] Figure 2 is the structural principle diagram of the application.

[0020] Figure 3 is the schematic diagram of the main valve assembly of the application.

[0021] Figure 4 is the schematic diagram of the actuator assembly of the application.

[0022] 1-main valve body assembly, 2-small flow electromagnetic valve, 3-medium flow electromagnetic valve, 4-small flow actuator assembly, 5-medium flow actuator assembly.

[0023] 1-1-throttle seat, 1-2-main valve housing.

[0024] Among them, since the small-flow electromagnetic valve and the medium-flow electromagnetic valve are consistent in structure, the small-flow actuator assembly and the medium-flow actuator assembly are consistent in structure, and the rules of the reference signs are also consistent, therefore, only the reference signs of the small-flow electromagnetic valve and the small-flow actuator assembly are explained, and the medium-flow electromagnetic valve and the medium-flow actuator assembly are analogized according to the corresponding rules.

[0025] 2-1-exhaust hole.

[0026] 4-1-valve, 4-2-closing cavity, 4-3-opening cavity, 4-4-piston, 4-5-spring, 4-6-small guide ring, 4-7-micro switch, 4-8-pressing plate, 4-9-energy storage sealing ring, 4-10-actuator housing; 4-11-moving sealing ring; 4-12-sealing ring, 4-13-sealing ring. DETAILED DESCRIPTION

[0027] This part is the embodiment of the present application, used to explain and illustrate the technical solutions of the present application. In the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0028] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship as given in the drawings, which are only for the purpose of facilitating the description of the present application and simplifying the description, and are not intended to indicate or imply that the device referred to or the case must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implying the number of the technical features indicated. Therefore, the features defined with "first", "second" and the like can explicitly or implicitly include more features. In the description of the present application, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0029] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be interpreted broadly, for example, it can be fixed connection, or detachable connection or integrated connection; it can be mechanical connection, or point connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood through specific circumstances.

[0030] Embodiment 1: An integrated multi-stage flow cut-off device, comprising a main valve assembly 1, a small flow electromagnetic valve 2, a medium flow electromagnetic valve 3, a small flow actuating assembly 4 and a medium flow actuating assembly 5, two pipelines are arranged in parallel between the inlet and outlet of the main valve assembly 1, one of which is controlled by the small flow actuating assembly 4, and the other of which is controlled by the medium flow actuating assembly 5; the small flow electromagnetic valve 2 controls the connection or closing of the passage of the small flow actuating assembly 4, and the medium flow electromagnetic valve 3 controls the connection or closing of the passage of the medium flow actuating assembly 5.

[0031] The main valve assembly 1 is a parallel structure of integrated double throttling seats 1-1, two throttling seats 1-1 correspond to two parallel pipelines respectively, one pipeline is a small flow passage, and the other pipeline is a medium flow passage, the pipe diameter of the medium flow passage is larger than that of the small flow passage; the throttling seat 1-1 is arranged in the middle of the pipeline, and the blocking of the throttling seat 1-1 will cause the blocking of the corresponding pipeline The main valve housing 1-2 of the main valve assembly 1 is provided with mounting round holes above the two throttle seats 1-1, and the small flow actuating assembly 4 and the medium flow actuating assembly 5 are respectively inserted and mounted on the two mounting round holes.

[0032] The small flow actuating assembly 4 and the medium flow actuating assembly 5 are the same in other structures except that the flow rates are different; the small flow electromagnetic valve 2 and the medium flow electromagnetic valve 3 are the same in other structures except that the flow rates are different.

[0033] The small flow actuating assembly 4 comprises a piston 4-4, the piston 4-4 separates the cylinder body of the actuating assembly into a closing cavity 4-2 and an opening cavity 4-3, the lower rod body of the piston 4-4 extends out of the opening cavity 4-3, the lower end of the lower rod body of the piston 4-4 is provided with a valve 4-1 matched with the throttle seat 1-1, a fixed spring seat is arranged in the middle of the closing cavity 4-2, a spring 4-5 is arranged between the spring seat and the piston 4-4, and the upper rod body of the piston 4-4 is limited in the radial direction by a small guide ring 4-6 in the spring seat.

[0034] The opening cavity 4-3 is connected with the pipeline of the inlet of the throttle seat 1-1 through a control pipeline, and the opening and closing of the control pipeline are controlled by the small flow electromagnetic valve 2.

[0035] The small flow electromagnetic valve 2 controls the opening and closing of the control pipeline through a telescopic ball, and the control pipeline is further provided with an exhaust hole 2-1; when the small flow electromagnetic valve 2 closes the control pipeline, the opening cavity 4-3 is connected with the exhaust hole 2-1.

[0036] The small flow actuating assembly 4 further comprises a micro switch 4-7, the micro switch 4-7 is mounted on the section of the upper rod body of the piston 4-4 extending out of the spring seat, and when the small flow actuating assembly 4 is in the opening or closing state, the upper position or the lower position of the piston 4-4 drives the micro switch 4-7 to touch other structures; the micro switch 4-7 is signal connected with an external host computer, and the external host computer obtains the current opening and closing state of the small flow actuating assembly 4 according to the signal of the micro switch.

[0037] Embodiment 2: Figure 1 It is an embodiment schematic diagram of the application.

[0038] The application discloses an electrically-controlled pneumatic multi-stage flow cut-off device, which mainly comprises a main valve body assembly, a small flow electromagnetic valve, a medium flow electromagnetic valve, a small flow actuating assembly, a medium flow actuating assembly, a micro switch assembly and the like.

[0039] Figure 2 It is a structural principle diagram of the application.

[0040] When the small flow electromagnetic valve is powered on, the moving iron core and the fixed iron core in the electromagnetic valve are attracted, the moving iron core drives the actuator rod (the actuator rod is pressed fit with the moving iron core) to move rightward against the spring force, and the ceramic ball opens the air inlet under the action of the inlet pressure, while blocking the exhaust hole of the opening cavity. Air enters the opening cavity through the air path. The pressure in the opening cavity increases to overcome the spring force, so that the piston moves upward, and the small flow path is opened. At this time, it is in a small flow mode. When the medium flow electromagnetic valve is powered on, the medium flow path is opened, and it is in a medium flow mode. When the small flow electromagnetic valve and the medium flow electromagnetic valve are powered on at the same time, the small flow path and the medium flow path are opened, and it is in a large flow mode.

[0041] Figure 4 The actuator assembly shown is used to convert pneumatic force into linear displacement. The closing cavity and the opening cavity of the actuator assembly are isolated by a dynamic sealing ring. When the electromagnetic valve is powered on, the pressure of the main valve body enters the opening cavity through the electromagnetic valve outlet, the closing cavity is connected with the atmosphere, and the pressure difference between the two cavities makes the piston push the spring to move until the piston is in balance and is stably positioned at a certain position, so that the lower piston is opened to a certain position, and the gas passes through the throttle seat in the main valve body to realize the connection of the flow path. When the electromagnetic valve is powered off, the lower piston and the throttle seat end face are sealed to realize the cut-off of the flow path.

[0042] The present application adopts a compact modular design with high integration, which includes a main valve body assembly, a small flow electromagnetic valve, a medium flow electromagnetic valve, a small flow actuator assembly, a medium flow actuator assembly, a micro switch assembly and the like. A hierarchical flow control scheme is adopted to receive instructions from the inerting system controller, adjust the flow mode of the nitrogen-rich gas of the inerting system by switching the on-off of the electromagnetic valve, and automatically switch to small, medium and large flow modes or cut off the gas flow. Meet the different flow requirements of the fuel tank in each flight stage.

[0043] The actuator assembly is provided with a main valve body assembly, which mainly includes a main valve body, an outlet flange, a small flow throttle seat and a medium flow throttle seat. The connection with the system pipeline and the internal gas path flow are realized. The main valve body assembly integrates a double-throttle seat parallel structure corresponding to the medium flow path and the small flow path. The structure is compact, the integration is high, the weight is light, and the volume is small.

[0044] The driving mechanism is mainly composed of an actuator assembly and an electromagnetic valve assembly. The electromagnetic valve outlet gas pressure is used to drive the piston to move, and the spring resets to cut off the flow of the throttle seat when the power is off. The electromagnetic valve can switch the on-off of the gas path within 2s to ensure that the device can quickly switch the gas path.

[0045] The small flow throttle seat and the medium flow throttle seat are integrated in the main valve body in the form of plug-in, and can be individually disassembled and maintained, which improves the maintainability of the device and reduces the maintenance cost. The machining precision of the throttle hole is controlled to improve the flow precision.

[0046] Piston-main valve seat sealing technology, using composite material combination dynamic sealing structure. The outer layer material of dynamic sealing ring is polytetrafluoroethylene composite material, which has good wear resistance. The dynamic sealing ring has elastic ring inside, which can compensate the outer layer material and ensure the long-term work of the device.

[0047] Piston-upper shell sealing technology, using PFI-1 sealing ring guide to ensure high temperature sealing and low friction of the piston, and ensure the high dynamic stability of the device.

[0048] Lower piston-throttle seat sealing technology, using rubber vulcanization sealing, which has good low temperature and high temperature performance, ensuring the internal sealing of the device.

[0049] Optimize the design of the main valve body flow channel to reduce the pressure loss caused by turbulence and improve the flow accuracy.

[0050] The micro switch is integrated on the main valve body to real-time feedback the valve flow state, which is convenient for fault prediction and diagnosis.

[0051] The above is only a specific embodiment of the present application, which is described in detail. The part not described in detail is the conventional technology. However, the protection scope of the present application is not limited to this. Any changes or replacements within the technical range disclosed by the present application can be easily thought by those skilled in the art, which should be covered in the protection scope of the present application. The protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An integrated multi-stage flow cutoff device, characterized in that, The system includes a main valve assembly (1), a small flow solenoid valve (2), a medium flow solenoid valve (3), a small flow actuation assembly (4), and a medium flow actuation assembly (5). The main valve assembly (1) has two parallel pipelines between its inlet and outlet. One pipeline is controlled to open or close by the small flow actuation assembly (4), and the other pipeline is controlled to open or close by the medium flow actuation assembly (5). The small flow solenoid valve (2) controls the opening or closing of the channel of the small flow actuation assembly (4), and the medium flow solenoid valve (3) controls the opening or closing of the channel of the medium flow actuation assembly (5).

2. The integrated multi-stage flow cutoff device according to claim 1, characterized in that, The main valve assembly (1) is a parallel structure with two integrated throttling seats (1-1). The two throttling seats (1-1) correspond to two parallel pipelines. One pipeline is a low flow channel and the other is a medium flow channel. The diameter of the medium flow channel is larger than that of the low flow channel. The throttling seat (1-1) is located in the middle of the pipeline. Blocking the throttling seat (1-1) will cause the corresponding pipeline to be blocked.

3. The integrated multi-stage flow cutoff device according to claim 2, characterized in that, The main valve housing (1-2) of the main valve assembly (1) is provided with mounting holes above the two throttle seats (1-1). The small flow actuation assembly (4) and the medium flow actuation assembly (5) are respectively inserted and installed on the two mounting holes.

4. The integrated multi-stage flow cutoff device according to claim 2, characterized in that, The small flow actuation assembly (4) and the medium flow actuation assembly (5) are identical in structure except for the different flow rates they control; the small flow solenoid valve (2) and the medium flow solenoid valve (3) are identical in structure except for the different flow rates they control.

5. An integrated multi-stage flow cutoff device according to claim 4, characterized in that, The small flow actuation assembly (4) includes a piston (4-4). The piston (4-4) divides the cylinder of the actuation assembly into a closing chamber (4-2) and an opening chamber (4-3). The lower rod of the piston (4-4) extends out of the opening chamber (4-3). The lower end of the lower rod of the piston (4-4) is equipped with a valve (4-1) that matches the throttle seat (1-1). A fixed spring seat is provided in the middle of the closing chamber (4-2). A spring (4-5) is provided between the spring seat and the piston (4-4). The upper rod of the piston (4-4) is radially limited by a small guide ring (4-6) inside the spring seat.

6. An integrated multi-stage flow cutoff device according to claim 5, characterized in that, The opening chamber (4-3) is connected to the inlet of the throttle seat (1-1) through the control pipeline, and the opening and closing of the control pipeline is controlled by the small flow solenoid valve (2).

7. An integrated multi-stage flow cutoff device according to claim 6, characterized in that, The small flow solenoid valve (2) controls the opening and closing of the control pipeline through a telescopic ball. The control pipeline is also equipped with an exhaust port (2-1). When the small flow solenoid valve (2) closes the control pipeline, the opening chamber (4-3) is connected to the exhaust port (2-1).

8. An integrated multi-stage flow cutoff device according to claim 5, characterized in that, The small flow actuation assembly (4) also includes a micro switch (4-7). The micro switch (4-7) is installed on the upper rod of the piston (4-4) extending from above the spring seat. When the small flow actuation assembly (4) is in the open or closed state, the upper or lower position of the piston (4-4) causes the micro switch (4-7) to contact other structures. The micro switch (4-7) is connected to an external host computer. The external host computer obtains the current switch state of the small flow actuation assembly (4) based on the signal of the micro switch.

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