DE1272652B - Pipe connection, especially for use in aircraft - Google Patents

Description

Pipe connection, in particular for use in aircraft The invention refers to a screw socket connection for thin-walled pipes with a small diameter, in particular for hydraulic high pressure oil lines in aircraft, using of seals and coupling balls.

The pipe connections in aircraft are higher than average claims, since it controls all movements of the aircraft, which is not a rigid body, constantly have to participate.

The pipelines laid in airplanes are subject to constant tensile and compressive loads, Stretching, twisting, occasionally straining and especially permanent Vibrations and dangerous vibrations exposed to it all Must survive unscathed, because in many cases it depends on their absolutely safe Function of the inventory of the aircraft including occupants.

On well-known pipe connections, which have proven themselves in land use, additional ones Providing fuses generally requires skilled workers and is in any case expensive both in the production of the pipe connections and in the periodically necessary or at least desirable loosening, on the one hand when cleaning the pipelines and on the other hand, when checking their tightness later during general overhauls of the aircraft, the vital pipelines without breaking or leaking must be checked for signs of fatigue etc. In such cases you have to pipe connections that appear intact are also loosened from time to time in order to be certain gain on reliability in a stipulated period of time.

In aircraft e.g. B. within the wings etc. there are also pipelines, z. B. compressed air lines, etc. with pipe connectors, which after completion of the aircraft are no longer readily accessible, on their (more frequent) loosening in general is waived, but which must be all the more reliable. As particularly aggravating It must also be emphasized that those in aircraft construction are important, often to the utmost stressed pipelines used specifically light pipes of the prescribed Quality, strength, toughness, elasticity, etc. even after heat treatment (Soldering, welding or the like), especially at the connection points, nor may their strength be weakened in any other way, whereby known types of pipe connections in which reinforcements are attached to the pipe ends or even sharp notches that are dangerous to vibration are used in airplanes cannot be considered at all.

The invention proceeds from a Schraubrauffenverbindung for thin-walled tubes, wherein the tube ends inserted in a cylindrical recess of the sleeve-shaped connector housing from both sides are clamped in the housing by a respective gasketed ring gland ring, in its outer part balls are guided, which when clinching the gland Press troughs of a predetermined depth into the material of the pipe wall through a threaded sleeve each provided with corresponding hollow cones.

The invention is based on the object of such a pipe connection designed in such a way that they are safe to operate even by non-specialists without pre-assembly on pipes of any material, any strength and any pipe wall thickness can also be attached in narrow, non-visible places, self-locking and is practically maintenance-free and requires multiple loosening and dismantling of the pipes to be coupled, without a part of the connection or the pipes to be connected Having to replace pipes.

According to the invention it is therefore proposed to solve the problem that the Outer part of the stuffing gland ring the hollow cones attached to the threaded sleeves Correspondingly conical and with some evenly on the circumference distributed cross bores for receiving compression balls is provided.

Are to be pressed into the pipe walls from the outer circumference No or only very few balls on the inside of the pipe walls when pressed on produce limited bulges, it is advantageous to before the first screwing together the screw socket connection into the interior of the pipe ends to use suitably inserted cylindrical hard filler piece, which after the first Generation of the depressions by the compression balls removed again only in the outer circumference of the pipe will.

By choosing the size and number of balls and the like Material is possible with the new pipe connection, any requirement tensile and torsional strength etc. to meet.

Due to the special choice of the taper angles and due to the special material properties the hollow cone part of the compression nuts makes it possible that not only in the pipes Impressions or depressions are impressed by the balls, but also: in the Hollow cone of the clamping nuts. This brings especially not or seldom to loosening pipe connections and in special cases advantages, especially with pipe connections, subject to constant vibrations and strains.

In the case of pipe connections that have to be loosened continuously or very often, the hollow cone the clamping nut hardened or tempered or the entire clamping nuts from accordingly hard material.

The drawing shows the invention in exemplary embodiments.

F i g. Fig. 1 shows an embodiment of the invention in partial section; F i g. 2 shows a similar embodiment of the pipe connection in partial section, with union nuts being selected as compression nuts; F i g. 3 shows a further exemplary embodiment of the pipe connection in partial section, with a filler piece being shown which is temporarily inserted when bulges in the interior of the pipes are to be prevented.

The pipe ends 1 and 2 are screwed in the same way and independently of each other. If z. B. the pipe end of the F i g. 1 is to be screwed, it is fitted with the threaded sleeve 3, the stuffing box ring 4 and the sealing ring 5 in the connecting housing 6 .

The gland ring 4 is provided, for example, with three (preferably with smaller pipe diameters) or four (preferably with larger pipe diameters) on the circumference of its conical part 4 'evenly distributed transverse bores 7 , each containing a compression ball 8.

The gland ring 4 is designed in the outer part as a cone 4 ', from which the balls 8 mounted in its transverse bores 7 protrude by a predetermined amount when the pipe ends 1 and 2 are inserted into the connecting housing 6 , but the balls 8 not yet in the Pipe walls 1 and 2 are pressed in.

This measure also determined after pressing of the balls 8 in the pipe walls 1 and 2, the pressing depth of the balls 8 in the material of the tubes 1 and 2, since the material hardness or toughness of the hollow cone of Preßmuttern is selected to be substantially greater than the resistance of the pipe walls against the ball indentations, so that depressions are essentially only formed in the pipe walls.

Exactly corresponding to the outer cone 4 'of the stuffing box ring 4, the threaded sleeve 3 has an identical hollow cone X which, when the threaded sleeves 3 are screwed into the internal thread 6' of the connector housing '6 with the internal connector 3', first hits the circumference of the external cone 4 'of the stuffing box ring 4 protruding parts of the balls 8 meets and then when the Ge # vindehülse 3 is screwed in further with the force corresponding to the intended cone angle presses into the pipe walls 1 or 2, the balls 8 in the pipe walls 1 and 2 impressions or depressions Ybzw. 2 ', which are kept permanently under the ball tension.

This process is limited by the subsequent seating of the hollow cone 3 'on the outer cone jacket 4'.

The compression balls 8 in the transverse bores 7 of the stuffing box ring 4 are, as mentioned, evenly distributed in its circumference in order to avoid one-sided stresses due to the reaction forces of the balls 8 when pressed into the pipe walls.

The pretension of the sealing ring 5 is of Stopfbüchsenringes 4 determined by abutment of a shoulder 9 on a corresponding annular shoulder 6 "in the connection housing 6 such that the precalculated size is sicheraestellt both the sealing voltage and for the holding-release back pressure of the balls. 8

In the embodiment of FIG. 2 are provided as compression nuts of the balls 8 over- tightened nuts Y 'on external threads 6 ...

In the embodiment of FIG. 3, the material hardness of the hollow cone 3 'of the threaded sleeves 3 when screwing in the threaded sleeve by the back pressure of the balls 8 in the hollow cone 3' of the threaded sleeves are 3 impressions or depressions 3 "'is generated by appropriate choice.

In the embodiment of FIG. 3 it is also shown that by temporarily inserting a suitable filler piece 10 bulges within the tubes 1 and 2 can be completely prevented.

Claims (1)

Claims: 1. Screw socket connection for very thin-walled, high-strength pipes of small diameter, in particular for hydraulic high-pressure oil lines in aircraft, using seals and coupling balls, the pipe ends inserted into a cylindrical recess of the sleeve-shaped connection housing from both sides in the housing by a stuffing box ring each provided with a sealing ring be clamped in whose outer part balls are guided pushing the predetermined by one each provided with corresponding hollow cones threaded sleeve in the material of the pipe wall troughs when clinching the gland pressing depth, d a d u rch g e k hen -zeichne t, that the outer part (4 ') of the stuffing box ring (4) the hollow cones (Y) of the threaded sleeves (3, Y`) is designed in a conical shape and is provided with some transverse bores (7) evenly distributed around the circumference to accommodate the compression balls (8) . 2. LElfsvorrichtung for screw socket connection according to claim 1 for generating ball indentations only on the pipe outer circumference without bulges in the pipe interior, characterized by a before the first screwing together of the screw socket connection in the interior of the pipe ends (1) suitably introduced cylindrical hard filler piece (10), which after the first Generation of the troughs by the compression balls (8) is only removed again in the outer circumference of the pipe. Documents considered: French Patent No. 1288 921; British Patent Nos. 914 923, 532 124; USA. Patent Nos. 2,310,744, 2,219,053.