HRP990330A2 - Coupling sleeve provided with locking means for pipes connection - Google Patents

Abstract

The two half-shells(11,12) of the sleeve fitted over the oppositely lying pipe ends are braced on both sides by two sealing clamps(31-34) and in their final position a defined gap remains between the two clamps on the lower side and between the two clamps on the upper side. On the inside of the half-shells, on both sides of the inlaid sealing mats, clamping elements(42,44) are installed in a corresponding groove which is closed in relation to the planes of separation of the half-shells.

Description

The invention consists of two half-shells that form a connection with a clamping head for full pipes, and such, which are composed of two half-pipes, such as cable channel pipes, repair pipes and the like, with one sealing pad between the sealing outer pipe wall and the inner wall clamping head, which is held in its final position with locking pins.

Such tube heads, which consist of half-shells, are already known. Thus, DE 78 33 835 U1 shows a tube cap, which corresponds to the main term of patent claim 1, where a viscous sealing compound is introduced into the cavity created by the outer diameter of the tube and the inner middle part of the inner diameter of the cap, as well as between the contact collision points of both half-shells.

These pipe heads have proven themselves in practice, and were used in large numbers, mostly for sealing cable channel pipes. In recent times, the technology of laying cable channels has completely changed, to the extent that sliding oils were used for pulling in cables, which chemically attacked the sealing compound, so that they melted it, and therefore permeability often occurred very quickly. Furthermore, it was shown that the viscosity of the applied sealants was subject to strong fluctuations at extreme temperatures, and as a result they were too soft or too hard.

From EP 0650007 B1, a following tubular head, which consists of two half-shells, has become known, and with which these defects have been removed. Accordingly, a longitudinally divided sealing pad is inserted between the outer pipe wall, which needs to be sealed, and the inner wall of the pipe head, whereby the same is caught in one groove on both half-shells.

These familiar tube headers still need to be improved. They are admittedly impermeable, but only up to a limit of about 3 bars. This is no longer satisfactory in many new application cases.

A further feature that needs to be improved is the longitudinal force transmission of such butt joints. It has been shown that, with today's new procedures, cables, especially cables with glass fibers of large lengths, are inserted under high pressure into the cable channel pipes. In this case, it may happen that they need to be removed from the head, for example via a repair piece, because their ability to transmit force longitudinally is no longer satisfactory. If the sealing effect is insufficient, a drop in pressure during the insertion of the cables can even completely prevent the procedure from being carried out, and in addition, water penetrates into the channel pipe in operating conditions at deeper layers or in watery areas, and this interferes with the proper use of the cable.

This invention has a solution to the mentioned problem. The invention, according to the mentioned patent claims, has the task of making such a connection with a pipe head, which will have an improved impermeability up to about 10 bar, and that when introducing cables at high pressure, it has a special possibility of transmitting longitudinal force.

The advantages achieved by this invention are particularly evident in the fact that it is possible, through an increased sealing effect, to load the cable tube with high pressure, and thus enable a modern process, i.e. a flow-in process for a long cable with the simultaneous effect of transmitting longitudinal force in the area of the connection with the pipe head , so that the unwanted pulling out of the pipe ends from the nozzle is safely prevented.

The invention is explained in more detail on the basis of one embodiment, shown in the following figures, where it shows:

Figure 1 is a perspective view of the tubular clamping head,

Figure 2 partial cross-section of a pipe clamping head,

Figure 3 partial section through the connection with a pipe socket,

Figure 4 is a perspective view of the half-shell of the cap, i

Figure 5 is a perspective view of the locking clip.

The tubular clamping head 1 shown in the pictures consists mainly of two half-shells 11 and 12, two halves of sealing pads 2a and 2b inserted inside the head, and four locking clips 31, 32, 33 and 34, as well as clamping elements 41, 42, 43 and 44.

As can be seen from Figure 1, both half-shells 11 and 12 of the tubular clamping head 1, which are mutually tightened by means of two inclined locking clips 31 and 32, respectively 33 and 34 on their upper and lower halves, so that the sealing pad 2 is compressed between both half-shells 11 and 12. When both locking clips 31, 32 and 33, 34 are brought to their end position, then an axial distance of about 25% of their corresponding length L remains between them, so that, in case of need, could take pressure corrections. Clamping elements 41, 42, 43, 44 for achieving force transferability in the longitudinal direction of the joint with a clamping head, are located in the upper part opposite the edge, that is, the dividing plane 61-62 of the half-shells 11, 12, of the closed groove 51 and 52, respectively.

Figure 2 shows the tubular clamping head in a partial section, where both lower locking clips 31 and 32 are already brought to their end position, while the upper locking clips 33 and 34 are pushed in the direction of the arrow onto the tubular head 1.

From the partial section of Figure 3, a pressure- and force-transmissible connection with a clamping head can be seen, in which both pipe ends 6 and 7 inside the body of the head 1 are connected to each other tightly and so that they transmit force longitudinally. In this case, the sealing takes place via the axially divided sealing pads 2a, 2b, which, as can be seen from Figure 4, are inserted in the dividing plane 61, 62 of the half-shell in the axially located groove 63 and/or inserted in the recessed area 21, 22. In Fig. 3, a certain distance between the locking clips 31 and 32, about 25% of their length L, in their final position is marked with A. The locking clips 31 and 32 are preferably made of reinforced synthetic material, and are provided externally with supports 37.

Fig. 5 shows the upper surface of the bridge area 35 of the locking clips 31, 32, 33, 34, which faces the head body 1. This upper surface is equipped with a sliding surface 36, to facilitate the laying of the locking clips on the head body.

Claims (5)

1. Connection with a clamping head for full pipes, or such pipes, which are composed of two half-pipes, such as cable channel pipes, repair pipes and the like, which has a clamping head of two half-shells, where both half-shells are laid around the pipe ends for connection and connected via the half-shells by means of the wedge action of the opposite locking clips, and with the sealing pads, which are located between the outer walls of the pipe ends and the inner wall of the clamping head, indicated by the fact that on the radial outer longitudinal sides of the dividing planes of the half-shells, two retaining clips are applied, starting from both axially opposite ends of the clamping head, that in their end positions there is always a certain distance between them, that the half-shells have sealing pads on both sides along their inner circumference, and according to the dividing planes the half-shells have closed grooves, in which the clamping elements are located, and that the connection with the clamping head is arranged in such a way that the code accommodation and the locking clips, the tightening of the clamping elements starts to work before the sealing pad is pressed. 2. Connection with a clamping head according to claim 1, characterized by the fact that in the end position the distance (A) between the locking clips (31-32 or 33,34) is about 25% of the length (L) of the locking clips. 3. Connection with a clamping head according to claims 1 and 2, characterized in that the sealing base (2a, 2b) is embedded in the dividing planes (61, 62) in the recessed area (21-22). 4. Connection with a clamping head according to claim 1 and one of the following claims, indicated by the fact that the bridge (35) of the locking clips (31, 32, 33, 34) is made in the form of a dovetail with an external support (37) and an internal sliding surface (36). 5. Connection with a clamping head according to claim 1 and one of the following claims, characterized by the fact that the locking clips (31, 32, 33, 34), sealing pads (2a, 2b) and half-shells (11, 12) are made of artificial substances of different degrees of hardness.