DE102009006106A1 - Safety catch for destructionless deceleration of projectile, has container that is filled with liquid i.e. water, and gas i.e. air, where gas is precompressed via liquid during movement of projectile via liquid - Google Patents

Abstract

The catch has a deceleration device comprising a multipart tubular container (1) i.e. aluminum pipe, with a front end (2) and a rear end (3) that are in a closed state. The container is filled with liquid (6) i.e. water, and gas (8) i.e. air. The gas is precompressed via the liquid during movement of body i.e. projectile (10), via the liquid. A relief valve (5) is arranged in a fore front wall (4) of a tubular housing. The container is arranged between two brake regions (7, 9) in a diagonal manner. The container is bent in a downwardly manner. An independent claim is also included for a method for destructionless deceleration of a body such as projectile.

Description

The The invention relates to a safety gear for non-destructive Braking a moving body, in particular one flying projectile, with the specified in the preamble of claim 1 Features and a corresponding method according to claim 10th

For non-destructive testing of the load of projectiles and their components, it is for example from the document U.S. Patent 3,718,041 known to use a one-sided closed tubular container in which the respective projectile is braked by a pressurized gas (usually air).

adversely is the relatively high apparatus in this known braking device Expenditure, as to pressure generation of the projectile braking gas provided at least one compressor with downstream pressure accumulator is. Moreover, in such a braking device already slight geometrical changes in position of the projectiles cause the gas needed to decelerate laterally flows past the projectile body and the braking effect is drastically reduced by the gas cushion located in front of the projectile.

From the CH-PS 293 466 Although it is known to use a unilaterally closed tubular container in which the respective abzubrägtende projectile is braked only by the forming in front of the projectile gas cushion, but such a braking device requires a relatively long brake pipe. It is therefore also proposed in this document to increase the shortening of the tube length of the braking device, the pressure by means of a separate compressor in the pipe section located in front of the projectile.

From the U.S. Patent 2,812,660 It is also known to use a hydraulic fluid (for example, water) in braking devices for nondestructive braking of projectiles as a braking means. However, it is disadvantageous when using a hydraulic fluid that a controlled transmission of the kinetic energy of the projectile to the fluid is problematic due to corresponding inertia effects of the brake fluid. In particular, to absorb higher bullet energies through the liquid, the amount of liquid must be substantially increased.

Of the Invention is based on the object, a catch or delay device indicate, in which easily a relatively short braking distance the particular body to be braked is ensured the delay of the body to be braked should preferably be linear.

These The object is achieved by the features of claim 1 and claim 10. Further, especially advantageous embodiments of the invention disclose the dependent claims.

The The invention is based essentially on the idea as a braking means for the so-called braking device both a liquid as well as directly following the liquid gaseous means to use, so that the braked Body first passes through the liquid brake fluid and then its residual energy to the gaseous Emits brake fluid.

Surprisingly it has been shown that in such an arrangement even without additional compressors and pressure accumulator relatively short braking distance of the body to be braked with the deceleration device can be achieved, the delay of the body to be braked approximately linear he follows. This is likely to be due be that first a slowing down of the body takes place through the liquid braking agent, which in this Process already a compression of the adjoining him causes gaseous braking agent. With increasing braking distance of the body in the liquid brake fluid decreases but its braking effect, since the liquid brake fluid pressed into the space of the gaseous brake fluid and it is atomized. At the same time take the compression the gaseous braking agent and thus its braking effect constantly closed, so that in total an approximately linear Delay of the body to be slowed down in the Deceleration device results. This process can preferably by a defined escape of the gas by means of a pressure reducing valve still be supported.

When It has proven advantageous, the two braking means in one To arrange tubular container, which is to his Intended use in a light Oblique position can be brought, so that the liquid Braking fluid immediately next to the gaseous brake fluid is arranged without there being an additional partition requirement. Positive is a slight downturn of the pipe, whereby a sealing against returning Water is not necessary. The tube is preferably an aluminum tube, whose length can be about 12 m, which makes the device very handy. Will then this pipe, for example formed by two, sub-pipes, is even guaranteed that the device can be easily transported.

As is known, as gaseous ges brake fluid, for example, air and used as a liquid brake fluid water.

It It has been shown that the effective braking time is approximately 0.14 sec. is the maximum negative acceleration at 100 g and the maximum overpressure in front of the bullet at <1 bar. In comparison, the braking was done without water at a Max. Negative acceleration 250 g, a total effective braking time of about 0.05 sec. and the braking without back pressure at a max. Negative acceleration 140 g and a total effective braking time of about 0.075 sec.

The Braking is done by means of water and gas much gentler, which shows itself in the slight negative acceleration. The negative acceleration can also by the ratio of water to gas in the pipe be set. The wear-promoting and In addition, dangerously high overpressure becomes practical reduced to 1/6, the effective braking time, however, significantly extended, which makes a short braking distance possible.

The Projectile is in the device (Appendix) according to the invention by means of Vacuum accelerates. Conventional devices of this Type speed up the projectile by expanding hot Gases. This results in a further advantage over be familiar devices, it is safer, shot and the same It is therefore more environmentally friendly, also because the noise pollution is reduced becomes.

moreover can increase reliability the initial speed is increased before deceleration, the nominal strength values of the object as well as the weight lowered become. The payload of the object is increased, the costs become lowered.

The Invention also allows a more accurate analysis, since changes in objects with higher security, only to be assigned to the acceleration method is. A multiple acceleration of the object is below the same Given conditions, since less changes by the Delaying on the object arises. By adjusting the amount of liquid and the air pressure can make the system bigger Number of speed and mass ratios adjusted become.

Further Details and advantages of the invention will become apparent from the following Based on figures explained embodiments. Show it:

1 schematically a tubular container of a safety device according to the invention, in which there is both a liquid brake fluid and a front side of the liquid brake fluid subsequent gaseous brake fluid;

2 the in 1 shown container when braking a projectile by the liquid braking means and

3 one 1 corresponding container when braking the projectile by the gaseous braking agent.

In the 1 - 3 are with 1 a tubular container of a catching or braking device according to the invention for the non-destructive deceleration of projectiles referred to. The container 1 For example, an aluminum tube, has a front and a rear end 2 . 3 and points to its back end 3 a closed front wall 4 on, in which there is a pressure relief valve 5 are located.

According to the invention it is now provided that the container 1 one with a liquid (for example, water) 6 and gas 8th (eg air) filled first brake area 7 and a second brake area 9 having. By chosen in the illustrated embodiment, slight tilt of the container 1 down is achieved that between the first braking area 7 and the second brake area 9 no partition is required. However, the media overlap in this case 6 and 8th ,

Should now a powered projectile 10 will be decelerated non-destructively, the bullet will 10 in the front end 2 of the pipe 1 introduced and the ends 2 . 3 of the pipe 1 closed airtight on both sides with a film (not shown in detail). Subsequently, the air from the entire pipe 1 with the help of the vacuum pump (pressure relief valve 5 sucked out). Now the film is behind the bullet 10 (on the front end 2 of the pipe 1 ) mechanically destroyed, the ambient air penetrates into the pipe at high speed 1 one. Because the projectile 10 the periphery by means of felt sealing rings (not shown for clarity) is sealed, the ambient air can only in the pipe 1 penetrate when the projectile 10 being pushed in front of him. In the braking area 7 becomes the bullet 10 thus by the liquid 6 braked and on the other hand, the to the liquid 6 subsequent gas 8th through the liquid 6 compressed. The further the projectile 10 in the first brake area 7 penetrates, the lower the braking effect in this area. That by the movement of the liquid 6 already precompressed gas 8th in the second braking area 9 gets through the floor 10 further compressed. The further the bullet 10 so moving, the lower the pressure difference of the vacuum to the environment, until after about 8-9 m complete pressure equalization prevails. Subsequently, the bullet builds 10 an overpressure in front of (inertia) and meets the ever-deeper water. The air pressure slows down, the water 6 is in motion, the braking effect is direction = 0. From a predetermined pressure, the pressure relief valve 5 opens (opens) and the pressure in the tank 1 held constant until the bullet 10 is completely braked and the tubular container 1 can be removed.

1

container

2

front The End

3

rear The End

4

bulkhead

5

Pressure relief valve

6

Liquid, braking means

7

first braking range

8th

Gas, braking means

9

second braking range

10

Bullet, body

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• US 3718041 [0002]
• - CH 293466 [0004]
• - US 2812660 [0005]

Claims (11)

Safety gear for non-destructive braking of a body ( 10 ), in particular a projectile, wherein the braking device tubular container ( 1 ) with a front and a rear end ( 2 . 3 ), which are closed in function, characterized in that - the container ( 1 ) with a liquid braking agent ( 6 ) and a gaseous braking agent ( 8th ), so that - during the movement of the body ( 10 ) by the liquid braking agent ( 6 ) a precompression of the gaseous braking agent ( 8th ) by the liquid braking agent ( 6 ) he follows. Deceleration device according to claim 1, characterized in that in the front end wall ( 4 ) of the tubular housing ( 1 ) a pressure relief valve ( 5 ) is arranged. Deceleration device according to claim 1 or 2, characterized in that it is in the gaseous braking means ( 8th ) is air. Braking device according to one of claims 1 to 3, characterized in that it is in the liquid braking means ( 6 ) is about water. Braking device according to one of claims 1 to 4, characterized in that the tubular container ( 1 ) is arranged obliquely, such that between the first brake area ( 7 ) and the second brake area ( 9 ) an intermediate wall can be omitted. Deceleration device according to claim 5, characterized in that the container ( 1 ) is inclined downwards. Braking device according to one of claims 1 to 6, characterized in that the container ( 1 ) consists of aluminum. Braking device according to one of claims 1 to 7, characterized in that the container ( 1 ) can be multi-part. Braking device according to one of claims 1 to 8, characterized in that the body ( 10 ) Has circumferentially felt seals. Method of non-destructive deceleration of a body ( 10 ), in particular a projectile, wherein the braking device tubular container ( 1 ) with a front and a rear end ( 2 . 3 ), which are closed in function, comprising the steps: - the body ( 10 ) is placed in the front end ( 2 ) of the container ( 1 ), - the ends ( 2 . 3 ) of the container ( 1 ) are airtight sealed with a film on both sides, - then the air from the entire container ( 1 sucked out, whereby - the foil behind the body ( 10 ) is mechanically destroyed, - whereby ambient air at high speed in the container ( 1 ) penetrates - the projectile ( 10 ) is pushed in front of him - until a perfect pressure equalization prevails. A method according to claim 10, characterized in that from a predetermined pressure, a pressure relief valve ( 5 ) opens and the pressure in the container ( 1 ) holds until the projectile ( 10 ) is completely braked and the tubular container ( 1 ) can be removed.