DE1243475B - Pipe connection - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. CL:

F161

German KL: Al 1-9

Number: 1243475

File number: B 88467 ΧΠ / 47 f

Filing date: August 12, 1966

Open date: June 29, 1967

Applicant:

Karl BuIa, Lucens;

Hans Jossif Islikon (Switzerland)

Representative:

Dipl.-Ing. H. Marsch, patent attorney, Düsseldorf, Lindemannstr. 31

Named as inventor:
Karl BuIa, Lucens (Switzerland)

Claimed priority:

Switzerland of October 2, 1965 (13 626)

The invention relates to a detachable pipe connection °

for media with high pressures and high rates of temperature change, in which two smooth metal tubes have outer grooves near their ends and with the help of applied to the tube ends, longitudinally slotted clamping pieces with corresponding inner grooves and outer wedge surfaces a screw connection at the end against each other

be pressed.
A pipe connection is known, which is well known

has the stated features, but is not suitable for media with high rates of temperature change suitable, because if there are temperature differences between the pipes and the screw connection, the preload on the

Sealing surfaces is lost.
It is an object of the invention to provide one for media

high pressure of the order of 100 bar to create usable, detachable pipe connections, which also -

at high rates of temperature change 20 2

remains tight and can therefore be used in areas of application that were previously connected to the welded joint, in which there were no reservations about temperature fluctuations. This goal is achieved by the fact that plastic deformations occur,
that the face contact surfaces. of the pipe ends in a third known pipe connection

in a manner known per se on less than the 25 sleeves to be connected to the pipe ends of the pipe wall cross-section are reduced, over which the pipe ends by means of a spring and the screw connection in a per se known element-having screw connection against one another to absorb any longitudinal expansion that occurs. This spring element has the of the spring element is formed, this being a task when the connection is loosened is dimensioned that when tightening the screw 30 rolling means on the conical sleeve automatically re-connection tighten one at the same time as a preload. Because of good heat transfer between plastic deformation on the contact surfaces of the individual parts of the pipe connection is intended occurs. for sudden and abrupt changes in temperature

Experiments have shown that the desired we-own. For high pressure and a sharp drop in temperature only with simultaneous changes, according to the given 35 changes, which exceed 100 ° C, this rule of coordinated use of the known pipe connection is useless,
known measures occurs. With regard to frequent loosening of the connection, the protective cover is therefore directed exclusively to the combination of features which has been found to be expedient for the invention. the end faces of the tubes to form that they

In a second known pipe connection, the two pipe ends are also gripped in outer grooves during the pretensioning process with an initially still low pressing force and, by means of a screw connection, are pressed together on the face side exclusively on a circular line, with the face-side contactors Contact pressure - at first elastic, later also areas to less than half of the pipe wall - plastic deformation · - are reduced to an increasingly cross-section. Also touch this widening circular ring surface,
Binding is not suitable for media of high temperature. Such conditions are achieved if - before

rate of change, as there is no spring element in the screw connection. Even if a such would be arranged, the aim of the invention could not yet be achieved, since no pieces of clergy so are present, the screw connection rather only by two fine threads with the pipe ends

prestressing - the face contact surfaces of the pipe ends together form a ring notch with a Form point angles of 0.5 to 5 °.

In a further improvement of the invention, the aim is to reduce the bending moments acting on the pipe connection to render harmless. After between

709 608/226

Claims (2)

3 4 the pipe ends and the screw connection by means of right-hand and left-hand threads through the screw arrangement a rigid sleeve 22 are already clamped together by clamping pieces. In hub sections binding is guaranteed, the improvement is that the spring elements 20, 21 are radial tapping holes achieved that the spring element probably in the axial gene 26 for engagement of a retaining key pre-direction resilient, see in all other directions 5, while the screw sleeve 22 on the circumference is designed to be as rigid as possible. radial slots 23 to which a key is attached For this purpose the strongest can be refilled. bigen parts of the spring element - preferably Fig. 3 shows, enlarged, a schematic a closed, hollow body of revolution bil- Section through the front ends of the tubes in the execution dend - as far away as possible from the pipe axes, example according to Fig. 2. The end of the pipe 1 but at least outside of a fictitious, to which has a re-entrant, that of the pipe 2 has a Tubes coaxial cylinder with the middle tube protruding cone. Half the top angle diameter arranged as a radius. One of the re-entrant cones is around the angle β The spring element can also be larger than half the tip angle α of the spring-out in the axial direction. great softness, considerable bending and torsional cone. absorb moments without the corresponding ends of tubes 1 and 2 coming together the deformations and stresses on the seal, the cones initially only wear area would matter. The inner edge has proven to be favorable. With increasing contact pressure In this regard, a spring element in the manner of enies widens the contact area, under elastic Corrugated pipe section proved. 20 and plastic deformation, outwards. The invention is illustrated in the drawing. A comparison of the two embodiments according to Provided embodiments explained in more detail. It Fig. 1 and 2 shows that the former has the advantage of shows quick and easy adjustment of the preload Fig. 1 has a longitudinal section through a first tube - the prerequisite for this is that the spring connection with corrugated tube-like spring element, 25 characteristic of the spring element 11 arithmetically Fig. 2 is a longitudinal section through a second pipe or is empirically predetermined. The on arrival Connection with disk-like spring elements, pull the pipe connection as required Fig. 3, for example, a partial section through two of the spring element length can be facilitated by Pipe ends. a suitable length measuring device is attached so that In Fig. 1 shows two pipe ends 1 and 2, 30 the measurement can be carried out continuously,
which abut with their end faces 3 and 4. The embodiment according to FIG. 2, on the other hand, has the front surface 3 is flat, the front surface 4, on the other hand, has the advantage that, once set, the front surface is slightly conical in shape. Half of the direction after each loosening, the tip angle of the cone of the end face 4 can be tightened again, whereby without measurement it is always practically -87 °. The outer wall of the tubes 1 and 2 carries close to 35 table results in the same bias. In addition, a circular groove 5 provided at the ends has a favorable effect in this variant on the fact that they have some zone. Sitting in these grooves is correspondingly stiffer, since there are no threaded surfaces 10 in the direct combs of clamping pieces 6. These are located on a flow of force. Slotted position of the circumference so that it can be used for the Mon- By deviating from the symmetrical shape, spread with a screwdriver and over 40 certain simplifications are possible. In this way, the pipe end can be placed on the grooved zone, for example the left screw socket 8 in FIG. 1. Think of the spring element as a unit of slim outer wedge surfaces 7. The clamping pieces 6 with screw sockets 8 are not only based on the left threaded connection 10, which have a hexagon 9 at one end but also the corresponding hexagon 9 and are omitted via a right-hand or left-hand thread 45 and 13. It would be disadvantageous, however, that in the 10, 10 'with corresponding threads of a spring tightening the element 11, which has now been reduced by a part, is in engagement. The flexible part of the screw connection a rotation in one of the cones of this spring element 11 consists of a corrugated surface 7 or the zones of the grooves 5 occurring tube section which would essentially be outside. Both would, however, be associated with a fictitious association with increased friction, coaxial to pipes 1 and 2, and a torsional moment would also be exerted on the cylinder with a diameter corresponding to one of the pipe ends, which is already located with a diameter corresponding to diameter d _m . The consideration of the possibility of damage to the lowest surface line of this fictitious cylinder is to be avoided, the end faces 3 and 4 should be avoided, likewise indicated by a dotted line 12. 55 arrangement given preference. The spring element 11 has on both sides for assembly
a hexagon 13. Fig. 2 shows a second embodiment of the patent claims:
inventive pipe connection. Parts corresponding to FIG. 1 are denoted by the same numbers. 1. Detachable pipe connection for media of high net. In contrast to the first embodiment, pressures and a high rate of temperature change have the second instead of two screw sleeves and gaps, in which two smooth metal pipes close to a spring element have two spring elements and one of their ends has outer grooves and with the help of a screw sleeve, the disk-like spring from on the pipe ends applied, corresponding elements with 20 and 21, the screw sleeve with 22 65 speaking inner grooves and outer wedge surfaces are designated. The spring elements are designed as slightly exhibiting, longitudinally slotted clamping pieces, conical disks, which fit on the inside on cones of the clamping pieces 6 that are opposed by a screw connection at the end and are pressed against one another on the outside.