RU2770886C1 - Blowing system of a fixed non-removable gun plant - Google Patents

Abstract

FIELD: weaponry.

SUBSTANCE: purge system includes a muzzle flap, a retractable air intake and exhaust gas ejection windows. The muzzle flap is covered with a radio-absorbing coating.

EFFECT: increased explosion safety in the cannon mount compartment in all flight modes when firing, ensuring low radar visibility of the aircraft in the stowed position, low aerodynamic drag in the stowed position, improving the operational manufacturability of the aircraft.

4 cl, 2 dwg

Description

The invention relates to the field of aircraft engineering, in particular to a blowing system for a fixed, non-removable gun mount of an aircraft.

Known from the prior art localizer aircraft gun patent RU2520708 C1, CL. F41A 21/32, F41F 1/00, B64D 7/02, pub. 06/27/2014. The localizer contains a rotary flap that closes the gun barrel in the absence of firing, and deflectors with holes installed in the flap, and is designed to reduce the impact of propellant gases on the aircraft. However, the known solution does not have low radar visibility, has a large effective dispersion area and high aerodynamic drag.

Known aircraft gun localizer patent RU2100737 C1, Cl. F41A 21/36, F41F 1/00, B64D 7/06, pub. 12/27/1997. The localizer contains a body with windows, a chamber on which the gun barrel is mounted, and gas outlet pipes. However, the known solution does not have low radar visibility, has a large effective dispersion area and high aerodynamic drag.

From US4619182 A, Cl. F41D 11/24, publ. 10/28/1986 a device for deflecting the propellant gases of an aircraft gun is known. The device comprises a body with a hole for the projectile, located opposite the muzzle hole of the aircraft gun, and a hole oriented away from the fuselage of the aircraft, across which deflectors are installed, directing the flow of powder gases. The known device does not have low radar visibility.

The objective of the invention is to eliminate the shortcomings of the prior art, namely, to increase the explosion safety of the gun mount compartment in all flight modes when firing from the gun mount, to reduce the contribution of the gun mount to the effective dispersion area (ESR) of the aircraft and to minimize the aerodynamic air resistance in the marching flight mode.

The technical result to which the invention is directed is to increase the explosion safety in the gun mount compartment in all flight modes when firing from the gun mount, to ensure low radar visibility of the aircraft in the stowed position, low aerodynamic drag in the stowed position and operational manufacturability of the aircraft, in including on a de-energized aircraft.

The technical result is achieved by the claimed system for blowing out a fixed, non-removable gun mount, containing a muzzle flap, a retractable air intake and exhaust gas ejection windows.

The muzzle flap may have a radio-absorbing coating.

Exhaust gas outlets can be made in the form of gratings.

The air channel inside the gun mount compartment may contain aerodynamic linings and/or fairings.

The invention is illustrated by the following drawings:

fig. 1 - outside view of the blowing system in the stowed position;

fig. 2 - the mechanism of the blowing system of the gun mount.

The following symbols are used in the figures:

1 - retractable air intake,

2 - muzzle flap,

3 - electric drive,

4, 8 - rocking chairs,

5, 6, 9 - thrust,

7 - gearbox,

10 - quick release pin,

11 - windows for exhaust gases.

In FIG. 1 shows a system for purging a fixed, non-removable gun mount of an aircraft in the stowed position, containing a retractable air intake 1, a muzzle flap 2, and windows 11 for ejection of exhaust gases.

In FIG. 2 shows the mechanism, i.e. the internal device of the blowing system of a fixed, non-removable gun mount, which drives it. In FIG. 2, electric drive 3, gearbox 7, structural elements for transferring axial load: rods 5, 6, 9 and rockers 4, 8, as well as quick-release pin 10 are indicated.

The stowed position means the position of the gun mount purge system in the non-operating state, when the gun mount is not selected, i.e. is not used, and the muzzle flap 2 closes the muzzle of the gun mount.

The gun mount is fixed and non-removable and is located in a special compartment of the aircraft. During operation of the cannon installation, the muzzle flap 2 opens and the air intake 1 extends.

When the gun mount is in the stowed position, its muzzle is shielded by the muzzle flap 2, thus forming a smooth theoretical contour of the aircraft. This design excludes the contribution of the gun mount to the RCS of the aircraft, providing low radar visibility of the aircraft, and also provides low aerodynamic drag in the stowed position.

In addition, the muzzle flap on the outside has a radio-absorbing coating. In the stowed position, the muzzle flap is rotated by the outer side with the radar-absorbing coating applied to it outward. The radio-absorbing coating absorbs electromagnetic waves, thereby further reducing the contribution to the EPR.

The scavenge air intake is a bucket type air intake. The air intake is retractable: in the working position, the air intake extends and opens; in the stowed position, the air intake is removed. The outer surface of the air intake in the stowed position forms a smooth theoretical contour of the aircraft. Thus, making the air intake movable makes it possible to eliminate its contribution to the EPR of the aircraft, providing low radar visibility of the aircraft, and also to eliminate the drag of the aircraft, providing low aerodynamic drag in the stowed position.

The air intake is located in front of the gun mount compartment. The air intake ensures that sufficient pressure air is drawn in to eject explosive exhaust gases from the gun mount compartment. Also, the air intake can act as a deflector, reducing the pressure on the outer side of the exhaust windows, thereby increasing the efficiency of ejection of air with exhaust gases through the exhaust windows. Thus, explosion safety is ensured in the gun mount compartment in all flight modes when firing from a gun mount, i.e. without restrictions for use in the entire range of altitudes and flight speeds.

The aerodynamic continuation of the air intake is an air channel inside the gun mount compartment. The air channel is a space inside the gun mount compartment, formed by a power set, i.e. frame elements (walls, panels, frames). Inside the air channel there are aerodynamic linings and fairings profiled with minimization of steps between them in order to ensure the smoothness of the graph of the air channel cross-sectional areas. The air channel inside the compartment of the gun installation for the passage of air has a practically flat surface. Through the air channel, air is supplied to the breech of the cannon installation, from which the largest amount of exhaust explosive gases is released. This design of the air channel provides unhindered passage of air inside it, which in turn further improves the explosion safety in the gun mount compartment in all flight modes when firing from a gun mount.

Opposite the breech of the gun mount, in the side wall of the gun mount compartment, there are exhaust gas ejection windows that provide exhaust gas ejection.

The shape of the exhaust gas ejection windows can be varied and is selected from design considerations. Exhaust gas ejection windows can be made in the form of gratings, cells, grids. This implementation of the windows makes it possible to exclude their contribution to the RCS of the aircraft from air ejection, providing low radar visibility of the aircraft. The shape of the windows ensures the uniformity of the airframe in the required radar range.

Elements of the blowdown system of the gun mount and a number of connections in the preferred embodiment are made quick-detachable to simplify the operation of the gun mount. Due to this, even on a de-energized aircraft, it is possible to perform a quick docking / undocking of the links of the gun mount purge system in conditions without the use of tools. This design ensures the operational manufacturability of the aircraft.

The blowing system of a fixed, non-removable gun mount works as follows.

For the operation of the gun mount, the muzzle flap 2 opens and the air intake 1 extends. During the operation of the gun mount, powder exhaust gases are formed in the gun mount compartment. At this time, the air intake, which is in the open position, takes in the incoming air flow. Air enters the air compartment of the cannon installation, blows through it and is thrown out of the ejection windows, carrying the exhaust gases with it. By blowing through the gun unit compartment, the concentration of explosive exhaust gases in the gun unit compartment is reduced to values at which the gun unit explosion is not possible.

In addition, in the open position, the air intake acts as a deflector for the exhaust windows, creating a vacuum on their outer side, thereby increasing the efficiency of air ejection with exhaust gases through the exhaust windows.

In the stowed position, when the gun mount is not selected for operation, the air intake and muzzle flap are closed, forming a smooth theoretical contour of the aircraft. This design of the cannon venting system does not create aerodynamic drag, and also eliminates the contribution to the RCS of the aircraft, due to which the aircraft has low radar visibility.

Thus, the proposed system for blowing through the compartment of a fixed, non-removable gun mount, embodied in its elements and their mutual arrangement and operation, ensures explosion safety in the gun mount compartment, a reduction in the RCS of the aircraft, low radar signature, minimization of aerodynamic drag in the marching flight mode and operational manufacturability.

Claims (4)

1. A system for blowing off a fixed fixed gun mount, including a muzzle flap, a retractable air intake and exhaust gas ejection windows. 2. The gun mount purge system according to claim 1, in which the muzzle flap has a radio-absorbing coating. 3. The blowing system of the gun installation according to claim 1, in which the exhaust gas outlets are made in the form of gratings. 4. The gun mount purge system according to claim 1, in which the air channel inside the gun mount compartment contains aerodynamic linings and/or fairings.

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