A fairing with a fire damper and a method of operation

Abstract

The application belongs to the technical field of helicopter structure design, and particularly relates to a fairing with a fireproof flap and an operation method. The fairing is provided with a fireproof flap, and the structure of the fireproof flap is arranged as follows: a flap body is connected with a damper wall through a hinge; a flap spring is arranged between the flap and the damper wall; a latch hole is arranged on the damper wall, and a latch seat is arranged on the flap body; a flap operating cylinder is installed on the outer side of the damper wall through a support; the flap operating cylinder is connected with a fire extinguishing bottle through a pipe; in a normal state, the flap body is opened, the flap spring is in a stretched state, and the flap operating cylinder is inserted into the latch seat through the latch hole; when the engine compartment is on fire, the fire extinguishing bottle receives a fire extinguishing instruction, the pressure generated by the fire extinguishing bottle firing drives the flap operating cylinder to contract, and the flap spring is contracted to drive the flap body to close.

Description

Technical Field

[0001] This invention belongs to the field of helicopter structural design technology, and specifically relates to a fairing with fireproof doors and its operation method. Background Technology

[0002] To ensure the normal operation of the engine, the engine compartment cowling needs to be equipped with ventilation openings to solve the heat dissipation problem. However, the presence of ventilation openings inevitably reduces the effectiveness of the fire suppression system. Currently, the engine compartment cowling ventilation openings are fixed structures, located in positions that provide the best ventilation and heat dissipation for the engine compartment. In conjunction with the ejector effect of the engine exhaust system, they create airflow that scours the engine compartment, preventing the accumulation of hot air and excessively high local temperatures in the engine compartment. However, if a fire occurs while the engine compartment is still ventilated, it will adversely affect fire suppression, resulting in poor fire suppression effectiveness and requiring secondary fire suppression.

[0003] Current fixed ventilation openings in engine compartment cowlings have a simple structure, which places high demands on the performance and concentration distribution of fire extinguishing agents, and carries a certain possibility of fire extinguishing failure. Common solutions include improving the effectiveness of the fire extinguishing agent and increasing its dosage. Summary of the Invention

[0004] Purpose of the invention: To propose a fairing with a fireproof valve. The valve is located on the ventilation vent of the engine compartment fairing. During flight, the valve is in the open position and locked by the piston rod of the valve actuator. In the event of a fire in the engine compartment, the pressure generated by the ignition of a fire extinguisher causes the piston rod of the valve actuator to retract, triggering the valve. The valve then returns to the closed position under the action of a spring and a connecting rod. The pressure generated by the ignition of a fire extinguisher, along with the action of a spring and a connecting rod, drives the fireproof valve to close. No similar fairing with a fireproof valve has been found in current helicopters.

[0005] Technical solution

[0006] A fairing with a fireproof door, wherein the fairing is equipped with a fireproof door, and the fireproof door structure is configured as follows:

[0007] The valve body is connected to the damper wall via hinges;

[0008] A valve spring is provided between the valve and the damper wall; a pin hole is provided on the damper wall, and a pin seat is provided on the valve body;

[0009] The valve actuator is mounted on the outside of the damper wall via a bracket; the valve actuator is connected to the fire extinguishing bottle via a pipe;

[0010] Under normal conditions, the valve body is open, the valve spring is in a stretched state, and the valve actuator extends through the pin hole and inserts into the pin seat. When the engine compartment catches fire, the fire extinguisher receives the fire extinguishing command, and the pressure generated by the fire extinguisher drives the valve actuator to contract, and the valve spring contracts to close the valve body.

[0011] Furthermore, fireproof doors are installed on the ventilation and heat dissipation vents of the engine compartment fairing.

[0012] Furthermore, the damper wall is a support component installed around the ventilation and heat dissipation vents of the engine compartment fairing. The outer side of the damper wall is connected to the outer skin of the fairing by its own curved edge, and the inner side of the damper wall is connected to the inner skin of the fairing by angle brackets.

[0013] Furthermore, the valve body includes a first valve and a second valve, with each end of the first and second valves connected to the damper wall via two hinges; the first and second valves are also connected to each other via connecting rods using corner plates, so that the first and second valves remain linked.

[0014] Furthermore, the area of ​​the first valve is larger than that of the second valve, and a valve spring is connected between the first valve and the damper wall.

[0015] Furthermore, the fire extinguishing bottle is connected to the valve actuator via a pipe with a cross-sectional area smaller than that of the fire extinguishing pipe.

[0016] Furthermore, the valve actuator includes: a housing, a piston, a piston rod, an actuator spring, a nut, a pipe nut, and a vent hole; the nut is threaded to the housing, and the actuator spring, piston, and piston rod are installed at the same time; one end of the piston rests on the actuator spring, and the pipe nut is also threaded to the housing;

[0017] The nut has a vent hole, which prevents the piston's outer surface from being subjected to back pressure; when the force on the actuator spring exceeds the force of the extinguishing agent, the piston returns to its original position; the piston rod is sleeved on the piston.

[0018] Furthermore, the piston rod of the valve actuator cylinder acts as a locking pin, passing through the pin hole and inserting into the pin seat.

[0019] Furthermore, a protective net is installed on the outside of the fireproof door.

[0020] A fairing operation method with fireproof doors, wherein there are fire alarm lights and fire extinguishing control buttons in the cockpit, the pilot determines whether there is a fire in the engine compartment by observing whether the fire alarm lights are lit, and operates the fire extinguishing control buttons to extinguish the fire;

[0021] When the engine compartment catches fire, it causes the bimetallic strip of the corresponding fire detector to bend, which disconnects the time-delay relay and illuminates the red fire alarm light in the fault indicator box on the instrument panel that is connected to the burning engine compartment, alerting the pilot and sending a signal to the voice alarm system, which then issues a voice alarm signal at the same time.

[0022] When the pilot presses the fire extinguishing button, the electric detonation tube of the fire extinguisher explodes, and the extinguishing agent is discharged under certain pressure.

[0023] A portion of the extinguishing agent enters the pipe connected to the valve actuator. The pipe enters the valve actuator through the pipe nut. When the valve actuator is subjected to the pressure generated by the extinguishing bottle, the piston compresses the actuator spring. The piston drives the piston rod to retract. Under the action of the valve spring and the connecting rod, the first and second valves return to the closed position.

[0024] In summary, the beneficial effects of the present invention are as follows:

[0025] This invention relates to a fairing with a fireproof valve. When the valve is open, it serves as a ventilation and heat dissipation vent for the engine compartment. Combined with the ejector function of the exhaust system, this allows heat to dissipate from the engine compartment, preventing the accumulation of hot air and ensuring normal helicopter flight. In the event of a fire in the engine compartment, the pressure generated by the detonation of the fire extinguishing bottle retracts the piston rod of the valve actuator, and the valve returns to the closed position under the action of a spring and connecting rod. Once the valve is closed, airflow in the engine compartment stops, significantly improving fire extinguishing efficiency and reducing the risk of fire extinguishing failure, without requiring increased extinguishing agent efficacy or dosage.

[0026] The pressure generated by the firing of a fire extinguisher bottle is used to drive the fireproof valve to close.

[0027] The locking and unlocking of the fireproof door is achieved by the movement of the door actuator.

[0028] The fireproof door is opened and closed using a spring design.

[0029] The linkage design enables the fireproof doors to work together.

[0030] The normal opening and closing of fireproof doors is achieved through motion simulation of the door mechanism.

[0031] The spring in the valve actuator is fully compressed by the 1.7 MPa pressure generated by the firing of the fire extinguisher.

[0032] The piston rod of the valve actuator is fully retracted through the detailed design of the spring.

[0033] The piston rod of the valve actuator is fully extended through the detailed design of the spring. Attached Figure Description

[0034] Figure 1 This is an isometric view of the fairing with fireproof doors of the present invention, but the protective netting outside the fireproof doors is not shown.

[0035] Figure 2 This is an enlarged isometric view of the fireproof door of the present invention.

[0036] Figure 3 This is an enlarged axonometric view of the fireproof door of the present invention.

[0037] Figure 4 This is an enlarged axonometric view of the fireproof door of the present invention.

[0038] Figure 5 This is a schematic diagram of the valve actuator cylinder 9 of the present invention.

[0039] Figure 6 This is a schematic diagram of the installation of the valve actuator cylinder 9 of the present invention. Detailed Implementation

[0040] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0041] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0042] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0043] A fairing with fireproof valves includes a first valve 1, a second valve 2, a damper wall 3, a hinge 4, a connecting rod 5, a spring 6, a pin seat 7, a pin hole 8, a valve actuator 9, a bracket 10, and a pipe 11. Valves 1 and 2 are mounted on the ventilation vents of the engine compartment fairing. The damper wall 3 is a support component installed around the ventilation vents of the engine compartment fairing. Both ends of valves 1 and 2 are connected to the damper wall 3 via two hinges 4. Valves 1 and 2 are connected by the connecting rod 5, ensuring they are linked. A spring 6 is installed between valve 1 and the damper wall 3, hooking the valves to allow them to open and close synchronously. A pin seat 7 is provided on valve 1, and a pin hole 8 is opened on the damper wall 3. The valve actuator 9 is installed on the outside of the damper wall 3 through the bracket 10. During normal flight, the valve actuator 9 is inserted into the pin seat 7 and the pin hole 8 to keep valve 1 and valve 2 open, so that the engine compartment can be ventilated and cooled. Once the engine compartment catches fire, the pilot presses the fire extinguishing button on the control panel. The pressure generated by the fire extinguishing bottle drives the valve actuator 9 to retract. With the retraction of the spring 6 and the linkage of the connecting rod 5, valve 1 and valve 2 can be closed at the same time. One end of the tube 11 is installed on the tube nut 17 of the valve actuator 9, and the other end of the tube 11 is connected to the fire extinguishing bottle through the pipeline.

[0044] When valves 1 and 2 are in the open state, spring 6 is stretched, and spring 6 and connecting rod 5 drive the valve closing action.

[0045] The valve actuator 9 requires a pressure of 1.7 MPa, which is supplied by the fire extinguishing bottle through a pipe 11 with a cross-sectional area smaller than that of the fire extinguishing pipe. The valve actuator 9 is installed on the outside of the damper wall 3 by a bracket 10.

[0046] The valve actuator 9 includes a housing 12, a piston 13, a piston rod 14, a spring 15, a nut 16, a pipe nut 17, and a vent 18. The nut 16 is threadedly connected to the housing 12, and the spring 15, piston 13, and piston rod 14 are installed at the same time. One end of the piston 13 rests on the spring 15, and the pipe nut 17 is also threadedly connected to the housing 12.

[0047] The nut 16 is provided with a vent hole 18.

[0048] Piston rod 14 is fitted onto piston 13.

[0049] When the pipe nut 17 in the valve actuator cylinder 9 is subjected to a pressure of 1.7 MPa generated by the firing of the fire extinguisher, the piston 13 will compress the spring 15. The piston 13 will drive the piston rod 14 to retract, and at the same time, under the action of the spring 6 and the connecting rod 5, the valve will return to the closed position.

[0050] The vent hole 18 on the nut 16 can prevent the piston outer surface from being subjected to back pressure.

[0051] When the force on spring 15 exceeds the pressure of the extinguishing agent, piston 13 returns to its original position.

[0052] A fairing with a fireproof valve and its operating method: When the engine compartment catches fire, the red fire alarm light in the fault indicator box illuminates. The pilot presses the fire extinguishing button on the control panel, and the electric detonation tube of the fire extinguishing bottle explodes. The extinguishing agent is discharged under a certain pressure into the pipe 11 connecting the engine compartment and the valve actuator 9. The pipe 11 is connected to the pipe nut 17 in the valve actuator 9. When the valve actuator 9 is subjected to a pressure of 1.7 MPa generated by the explosion of the fire extinguishing bottle, the piston 13 compresses the spring 15. The piston 13 drives the piston rod 14 to retract. Under the action of the spring 6 and the connecting rod 5, the valve 1 and valve 2 return to the closed position.

[0053] The vent hole 18 on the nut 16 can prevent the piston outer surface from being subjected to back pressure; when the force on the spring 15 exceeds the pressure of the extinguishing agent, the piston 13 returns to its original position.

[0054] Piston rod 14 acts as a locking pin.

[0055] Example

[0056] A fairing with fireproof valves includes valve 1, valve 2, damper wall 3, hinge 4, connecting rod 5, spring 6, pin seat 7, pin hole 8, valve actuator 9, bracket 10, and pipe 11. Valve 1 and valve 2 are mounted on the ventilation and heat dissipation vents of the engine compartment fairing. The damper wall 3 is a support component installed around the ventilation and heat dissipation vents of the engine compartment fairing. The outer side of the damper wall 3 is connected to the outer skin of the fairing by its own curved edge, and the inner side of the damper wall 3 is connected to the fairing by angle brackets. The inner skin of the cover is connected, and the two ends of valve 1 and valve 2 are respectively connected to the damper wall 3 by two hinges 4. Valve 1 and valve 2 are connected to each other by a connecting rod 5 using corner pieces, so that valve 1 and valve 2 keep linked. Valve 1 has a larger area than valve 2, which facilitates the installation of spring 6 between valve 1 and damper wall 3. A corner piece for hooking spring 6 is riveted to valve 1, and a small hole is opened in damper wall 3 for hooking spring 6. Door 1 and damper wall 3, spring 6 can stretch and contract, allowing valve 1 and valve 2 to open and close synchronously. Valve 1 is equipped with a pin seat 7 for limiting valve 1 and valve 2 when they are open. At the same time, a pin hole 8 is opened on damper wall 3 for valve actuator 9 to pass through. Valve actuator 9 is installed on the outside of damper wall 3 via bracket 10. During normal flight, valve actuator 9 is inserted into pin seat 7 and pin hole 8, keeping valve 1 and valve 2 open. At the same time, spring 6 is in a stretched state, allowing ventilation and heat dissipation in the engine compartment. Once the engine compartment catches fire, the pilot presses the fire extinguishing button on the control panel. The pressure generated by the fire extinguishing bottle drives valve actuator 9 to contract. With the contraction of spring 6 and the linkage of connecting rod 5, valve 1 and valve 2 can be closed simultaneously. One end of pipe 11 is installed on pipe nut 17 of valve actuator 9, and the other end of pipe 11 is connected to fire extinguishing bottle through a pipeline.

[0057] The materials for valve 1, valve 2, damper wall 3, and hinge 4 are all titanium alloy sheet metal parts.

[0058] Connecting rod 5 is a machined aluminum alloy part.

[0059] Spring 6 is a tension spring with an outer diameter of Φ17 mm and 17 working coils.

[0060] The pin holder 7 is an aluminum alloy sheet metal part.

[0061] When valves 1 and 2 are in the open state, spring 6 is stretched, and spring 6 and connecting rod 5 drive the valve closing action.

[0062] The valve actuator 9 requires a pressure of 1.7 MPa, which is supplied by the fire extinguishing bottle through a pipe 11 with a cross-sectional area smaller than that of the fire extinguishing pipe. The valve actuator 9 is installed on the outside of the damper wall 3 by a bracket 10.

[0063] The valve actuator 9 includes a housing 12, a piston 13, a piston rod 14, a spring 15, a nut 16, a pipe nut 17, and a vent 18. The nut 16 is threadedly connected to the housing 12, and the spring 15, piston 13, and piston rod 14 are installed at the same time. One end of the piston 13 rests on the spring 15, and the pipe nut 17 is also threadedly connected to the housing 12.

[0064] The nut 16 is provided with a vent hole 18. The vent hole 18 on the nut 16 can prevent the outer surface of the piston from being subjected to counter pressure; when the force on the spring 15 exceeds the force of the extinguishing agent, the piston 13 returns to its original position.

[0065] Piston rod 14 is fitted onto piston 13.

[0066] A helicopter fairing with fireproof flaps and its operating method are disclosed. The cockpit includes fire alarm lights and fire suppression control buttons, enabling the pilot to detect a burning engine compartment and operate the corresponding fire suppression circuit. When the engine compartment catches fire, the bimetallic strip of the corresponding fire detector bends, causing a time-delay relay to disconnect. This illuminates the red fire alarm light connected to the burning engine compartment in the fault indicator light box on the instrument panel, alerting the pilot and sending a signal to the voice alarm system, which simultaneously issues a voice warning signal.

[0067] When the pilot presses the fire extinguishing button, the electric detonation tube of the fire extinguisher explodes, and the extinguishing agent is discharged under certain pressure into the pipe 11 connected to the valve actuator 9 in the engine compartment. The pipe 11 enters the valve actuator 9 through the pipe nut 17. When the valve actuator 9 is subjected to the pressure generated by the fire extinguisher, the piston 13 compresses the spring 15. The piston 13 drives the piston rod 14 to retract. Under the action of the spring 6 and the connecting rod 5, the valves 1 and 2 return to the closed position.

[0068] Piston rod 14 acts as a locking pin.

[0069] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A fairing with fireproof doors, characterized in that: The fairing is equipped with a fireproof door, the structure of which is as follows: The valve body is connected to the damper wall via hinges; A valve spring is provided between the valve and the damper wall; a pin hole is provided on the damper wall, and a pin seat is provided on the valve body; The valve actuator is mounted on the outside of the damper wall via a bracket; the valve actuator is connected to the fire extinguishing bottle via a pipe; Under normal conditions, the valve body is open, the valve spring is in a stretched state, and the valve actuator extends through the pin hole and inserts into the pin seat. When the engine compartment catches fire, the fire extinguisher receives the fire extinguishing command, and the pressure generated by the fire extinguisher drives the valve actuator to contract, and the valve spring contracts to close the valve body.

2. The fairing according to claim 1, characterized in that: Fireproof doors are installed on the ventilation and heat dissipation vents of the engine compartment fairing.

3. The fairing according to claim 2, characterized in that: The damper wall is a support component installed around the ventilation and heat dissipation vents of the engine compartment fairing. The outer side of the damper wall is connected to the outer skin of the fairing by its own curved edge, and the inner side of the damper wall is connected to the inner skin of the fairing by angle brackets.

4. The fairing according to claim 3, characterized in that: The valve body includes a first valve and a second valve. The first valve and the second valve are connected to the damper wall at both ends by two hinges. The first valve and the second valve are also connected to each other by a connecting rod using corner plates, so that the first valve and the second valve keep in linkage.

5. The fairing according to claim 4, characterized in that: The area of ​​the first valve is larger than that of the second valve, and a valve spring is connected between the first valve and the damper wall.

6. The fairing according to claim 5, characterized in that: The fire extinguishing bottle is connected to the valve actuator through a pipe with a cross-sectional area smaller than that of the fire extinguishing pipe.

7. The fairing according to claim 6, characterized in that: The valve actuator includes: a housing, a piston, a piston rod, an actuator spring, a nut, a pipe nut, and a vent hole; the nut is threaded to the housing, and the actuator spring, piston, and piston rod are installed at the same time; one end of the piston rests on the actuator spring, and the pipe nut is also threaded to the housing; The nut has a vent hole, which prevents the piston's outer surface from being subjected to back pressure; when the force on the actuator spring exceeds the force of the extinguishing agent, the piston returns to its original position; the piston rod is sleeved on the piston.

8. The fairing according to claim 7, characterized in that: The piston rod of the valve actuator cylinder acts as a locking pin, passing through the pin hole and inserting into the pin seat.

9. The fairing according to claim 8, characterized in that: The fireproof hatch is equipped with a protective net on the outside.

10. A method for operating a fairing with fireproof doors, characterized in that: The cockpit is equipped with fire alarm lights and fire extinguishing control buttons. Pilots determine whether there is a fire in the engine compartment by observing whether the fire alarm lights are lit, and operate the fire extinguishing control buttons to extinguish the fire. When the engine compartment catches fire, it causes the bimetallic strip of the corresponding fire detector to bend, which disconnects the time-delay relay and illuminates the red fire alarm light in the fault indicator box on the instrument panel that is connected to the burning engine compartment, alerting the pilot and sending a signal to the voice alarm system, which then issues a voice alarm signal at the same time. When the pilot presses the fire extinguishing button, the electric detonation tube of the fire extinguisher explodes, and the extinguishing agent is discharged under certain pressure. A portion of the extinguishing agent enters the pipe connected to the valve actuator. The pipe enters the valve actuator through the pipe nut. When the valve actuator is subjected to the pressure generated by the extinguishing bottle, the piston compresses the actuator spring. The piston drives the piston rod to retract. Under the action of the valve spring and the connecting rod, the first and second valves return to the closed position.

Images