RU2268765C1 - Water intake device for fire-fighting seaplane - Google Patents

Abstract

FIELD: aeronautical engineering.

SUBSTANCE: proposed water intake device has water duct and mechanism for extension and retraction of water duct. Scoop of water intake device is articulated on water duct body. Water duct extension and retraction mechanism has hydraulic cylinder and shaft on which unit for emergency holding of mechanism is retracted position is secured. Retraction and extension mechanism is provided with damper for engagement of shaft with hydraulic cylinder. Emergency holding unit is made in form of ratchet with sensor showing emergency retracted position.

EFFECT: increased service life; enhanced operational reliability.

2 cl, 6 dwg

Description

The invention relates to aircraft, in particular to devices for hydrodynamic refueling of tanks with water on a fire seaplane.

A water intake device is known (US patent 3423053, class B 64 D 1/16, NKI 244-136, 1969). The device comprises a water intake bucket, a water conduit, a mechanism for lowering the water intake bucket, a mechanism for unlocking the sash overlapping the water intake opening.

The disadvantage of this device is the design complexity and lack of reliability with high-speed water sets.

Known water intake device for a fire seaplane (RU 2174934, B 64 D 1/16), consisting of a water conduit, on the body of which the bucket of the water intake is pivotally mounted, and its release-cleaning mechanism, containing a hydraulic cylinder and a shaft, on which the emergency holding mechanism is fixed in the retracted position in the form of twin springs.

The disadvantages of this device are its low resource when operating at high speeds, because resonant oscillations destroy the exhaust-cleaning mechanism, and also that when it collides with solid floating objects and triggers an emergency holding mechanism for the intake bucket, the position of the intake bucket is not signaled, and the pilot does not knows if the emergency hold mechanism has worked and the bucket has been removed.

When refueling tanks of fire-fighting aircraft with water, refueling time is of great importance, therefore, an important task for fire-fighting seaplanes is to maximize the use of hydrodynamic pressure on planing for filling water tanks, thereby reducing the water section of the track and reducing the time for refueling. At the same time, an increase in the intensity of water intake entails heavy loads on the intake device due to the instability of the water surface and due to interruption in the smooth flow around the ladle of the intake. A high level of vibration and a high coefficient of dynamism, as well as a collision with a solid floating object, cause fatigue damage and destruction of the water intake structure and the adjacent structure of the seaplane boat.

The task of the invention is to increase the resource, operational manufacturability, increase reliability and reduce weight.

This object is achieved in that the water intake device comprises a water conduit on the body of which the water intake bucket is pivotally mounted, a release-cleaning mechanism thereof, which comprises a hydraulic cylinder and a shaft with an emergency holding bucket fixed to it in the retracted position, made in the form of a ratchet with an alarm sensor emergency retracted position, while the shaft and the hydraulic cylinder of the exhaust-cleaning mechanism are interconnected by a damper. To reduce hydrodynamic drag, the bucket of the intake is equipped with a stacker.

Compared with the prototype, the proposed device has the following advantages:

- installation of a damper on the exhaust-cleaning mechanism increases the resource of the intake device, as the damper absorbs vibration and in an emergency softens a blow to a solid floating object.

- at the proposed water intake device, the damper and the emergency holding mechanism in the retracted position are located on the shaft, and in the prototype, the emergency holding mechanism springs in the retracted position are mounted on the shaft and on the water main body, which makes mounting and dismounting during maintenance of the device difficult.

- weight reduction is achieved due to the fact that in the proposed device, the hydraulic cylinder of the exhaust-cleaning mechanism only releases and removes the bucket of the intake, which reduces its power and, consequently, its weight, and in addition to the release and cleaning of the intake bucket, the prototype also triggers an emergency mechanism holding in the retracted position (pulls the springs).

The invention is illustrated by drawings, where:

figure 1 - General view of the placement of the water intake;

figure 2 - view A - installation of the mechanism for the release and cleaning of the bucket of the intake with a stacker (indicated by a dotted line);

figure 3 - view B - the mechanism of the release-cleaning;

4 is a side view of a damper, a cross-section BB of a rubber-metal coupling;

5 is a view of E is the ratchet wheel of the emergency holding mechanism in the retracted position and the coupling half;

6 is a view of G - ratchet wheel from the side of the coupling half.

The seaplane water intake device comprises a water intake bucket 1 pivotally mounted on the body of the water conduit 2, a release-cleaning mechanism 3 thereof, comprising a hydraulic cylinder 4 and a shaft 5, which ends with the emergency holding mechanism 6 in the retracted position, with the emergency retracted position sensor 7. A damper 8 is installed on the shaft 5, consisting of two rubber-metal coupling halves 9 and 10, one coupling half 9 is connected via a lever 11 to the hydraulic cylinder 4, and the other coupling half 10 is connected via a shear element 12 to the shaft 5. The emergency holding mechanism 6 in the retracted position consists of a fixed on the shaft 5 of the ratchet wheel 13, the cams 14, mounted on both sides of the ratchet wheel 13 on the shaft 5 and on the coupling half 10, a spring-loaded dog 15 with rollers, pivotally mounted on the casing of the duct 2. On the dog 15 is installed sensor 7 emergency removed e. in the form of a magnet reed switch. The bucket of the intake is equipped with a stacker 16.

The intake device operates as follows.

The outlet and cleaning of the bucket of the inlet 1, mounted on the casing of the conduit 2, is carried out using the mechanism 3 release-cleaning, while the damper 8 and the mechanism 6 emergency holding in the retracted position, located on the shaft 5, rotate together with the shaft 5 and do not impede the movement of the release and cleaning. The rollers of the dog 15 move along the cams 14 and prevent the dog 15 from making contact with the ratchet wheel 13. The damper 8 and the impactor 16 reduce the destructive effect of disturbing forces from a solid floating object or from an unstable water surface.

When the bucket of the intake 1 is hit by a solid floating object, it is thrown into the niche of the body of the water conduit 2, and since the hydraulic cylinder 4 of the exhaust-cleaning mechanism 3 remains in the “released” position, the damper 8, by its rubber-metal coupling halves 9 and 10 connecting the shaft 5 and the hydraulic cylinder 4, slow down the casting of the bucket of the intake 1 by friction with each other, the shear element 12 is destroyed between the shaft 5 and the coupling half 10, and in the retracted position, the emergency holding mechanism 6 is engaged in the retracted position, which is combined with the emergency retracted position sensor 7. In this case, the cams 14, turning on the coupling half 10 more slowly, and together with it on the shaft 5, move apart under the rollers of the dog 15, and the dog 15 lowers onto the ratchet wheel 12 and fixes the shaft 5 and, accordingly, the intake bucket 1 in the retracted position through it . Dog 15, having changed its position, shifts the magnet of the reed switch of the sensor 7 emergency emergency position and signals the position of the bucket water intake 1 to the pilot.

The proposed intake device of the fire-fighting seaplane has a higher resource in comparison with the prototype due to the fact that it is equipped with a damper and operational adaptability due to the fact that the emergency holding mechanism is compactly located on the shaft, installation, dismantling, maintenance are easier, since the pilot is informed that the bucket after the accident is in the retracted position, and less weight because the hydraulic cylinder can be made with less power, and therefore less weight.

Claims (2)

1. The intake device of the fire-fighting seaplane, consisting of a water conduit, on the body of which the bucket of the water intake is pivotally mounted, and a mechanism for its release-cleaning, which contains a hydraulic cylinder and a shaft on which the emergency holding mechanism is fixed in the retracted position, characterized in that the release-cleaning mechanism equipped with a damper that provides interaction of the shaft with the hydraulic cylinder, and the emergency holding mechanism is made in the form of a ratchet with an emergency position sensor. 2. The intake device of the fire seaplane according to claim 1, characterized in that the bucket of the intake is equipped with a stacker.

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