SK281119B6 - Plug-in coupling for the connection of two plastic pipes - Google Patents

Abstract

Plug-in coupling (1) for the connection of plastic pipes (5), having in each case one clamping device in the end regions of the coupling socket (2) and having actuating devices for the clamping devices (3, 4). The plug-in ends of the plastic pipes (5) can be fixed by the clamping devices (3, 4). The clamping devices (3, 4) each exhibit a steel clamping ring (7) which is provided with a function slot (6) and exhibits, on the outer circumference, a clamping cone configuration (8) and, on the inner circumference, at least one clamping rib (9). In at least one of the two end regions of the coupling socket (2), the steel clamping ring (7) is inserted into a clamping-ring receiving means (12) which is open on the end-border side and interacts with a clamping counter-cone (11). The steel clamping ring (7) is set in the clamping-ring receiving means (10) with the aid of a screwed-on union nut (14). An inserted plug-in end (5) clamps against withdrawal by interaction, caused by retraction friction, of the clamping cone configuration (8) with the clamping counter-cone configuration (11).

Description

Technical field

BACKGROUND OF THE INVENTION The present invention relates to a male coupling for connecting two plastic pipes with two male ends inserted into the male coupling, with a sleeve open at opposite end edges, with one clamping device at each end of the sleeve and flap seals arranged downstream of the clamping device. The clamping device and the flap seal are arranged in a recess of the sleeve. The clamping device comprises a steel clamping ring provided with a notch which is circumferentially provided with a clamping cone and on the inside with at least one clamping rib.

BACKGROUND OF THE INVENTION

In the known plug-in connectors on which the invention is based, various embodiments of the clamping rings are provided, which are provided with a clamping cone cooperating with a clamping support cone. In any case, on both end portions of such a coupling there is provided a union nut acting as a control device of the entire clamping device, which is screwed onto the end portion of the coupling. In this way, the ends of the plugged pipes are clamped. Some known clamping devices also function in that the plugged-in pipe end is clamped against extrusion by the action of the clamping cone and the clamping opaque cone, which is conditioned by the effect of friction occurring when attempting to pull out the clamped end of the pipe.

In principle, a plug connector is known of the kind described above, in which one clamping ring is each provided with a notch located in a recess with a rectangular cross-section. The inner circumference of the end portions of the sleeve is clearly larger than the outer circumference of the plug ends to be inserted therein, since the clamping ring having a notch extends through its narrower conical end into the gap between the plug end and the inner circumference of the sleeve when clamped at the plug end. If the plug-in end is loaded by tensile forces, the tapered conical end of the clamping ring can only engage the edge of the recess with a rectangular cross-section. This results in high surface pressures and stress peaks at both the edge and the portion of the clamping ring that rests on it, which may adversely affect the plug-in end consisting of plastic (see US 39 20 270). Since the inner circumference of the end portion of the sleeve has a substantially larger diameter than the outer circumference of the male end, the seal in the known embodiment is also insufficient.

In addition, a tubular connecting piece is known, comprising a connecting body for receiving the end portions of the tubes to be joined, in which a steel clamping ring and a seal are arranged in the recess of the tubular connecting piece. The steel clamping ring is pushed into its recess by screwing the union nut onto the tubular connector. The gasket is deformed. However, since the seal consists of an elastic material such as synthetic rubber, it is compressed accordingly. Therefore, there is a functional relationship between the action of the seal on the one hand and the action of the steel clamping ring or the respective locking element on the other. Therefore, it cannot be ruled out that, with the union nut loosely tightened, the effect of the steel clamping ring on the inserted plug end will be insufficient. If the nut is tightened too tightly, there is also the danger that the seal can be damaged or even squeezed out of its recess by the strong deformation which occurs thereby (see DE 24 39 100).

SUMMARY OF THE INVENTION It is an object of the invention to improve the design of the plug coupling sleeve both in its manufacture and in its function.

SUMMARY OF THE INVENTION

This is accomplished by a male connector for connecting two plastic tubes with two male ends inserted into the male connector, with a sleeve open at opposite end edges, with one clamping device at each end of the sleeve and flap seals arranged downstream of the clamping device in the insertion direction. the clamping device and the lip seal are arranged in a recess of the sleeve and the clamping device comprises a steel clamping ring provided with a notch which is circumferentially provided with a clamping cone and on the inside with at least one clamping rib according to the invention. the edge of the receiving recess, which is provided with a support cone, the steel clamping ring arranged in the edge-open recess is fixed in the recess by means of a union nut screwed onto the wall a corresponding end portion of the sleeve, the lip seal consists of a trapezoidal support ring and a shaped sealing lip protruding from the support ring in the insertion direction, and is disposed in a recess consisting of a bearing groove and a bearing surface, the carrier ring being inserted into the bearing the sealing lip abuts against the abutment surface, and wherein the inserted plug-in end is fixed by the interaction of the clamping cone with the supporting cone.

Preferably, the clamping rib has a cross-sectional shape. This ensures a very firm and secure clamping when the pipe end is inserted. The functional notch in the steel clamping ring may be parallel to the longitudinal axis of the plug connector. In particular, if several clamping ribs are arranged one above the other on the inner circumference, it is preferred that the steel clamping ring is provided with a functional notch inclined to the longitudinal axis of the plug connector at an angle of about 45 °. Then, the plugged end of the tube is held by the ribs all over or almost the entire inner circumference of the steel clamping ring. According to a further preferred embodiment, the at least one front edge of the plug coupling sleeve is provided with a circumferential bevel. In this way, the steel clamping ring can be inserted particularly easily into the second receiving recess opened in the front edge.

According to a further preferred embodiment, simple to manufacture, on the clamping support cone ring provided in the second receptacle open at the edge, the support cone is made and the support cone ring is inserted together with the steel clamping ring in the second receptacle open at the edge. The union nut is preferably provided with a stop shoulder on a steel clamping ring arranged in a second bearing recess open at the edge or on a clamping support cone ring.

When the union nut that is provided at at least one end of the male connector is released, the connection of the inserted pipe end in the male connector is also released. Then, the end of the plastic tube inserted into the male connector on this side can be removed. This is particularly important in the case of plug-in couplings for connecting plastic pipes in which cables are laid, in particular for the insertion of these cables, but it is also advantageous for plug-in couplings which

SK 281119 Β6 are not intended for routing cables. If a bevel of about 45 ° is provided on the inner edge of the plug coupling sleeve on its circumference on its inner side, this makes it possible to re-insert the plastic tube with the steel clamping ring or the clamping support cone ring.

With respect to the function of the steel clamping ring, the conical support ring and the union nut, several possibilities exist within the scope of the invention. According to one embodiment of the invention, the steel clamping ring and the conical support ring are clamped by screwing the union nut. This embodiment can be provided at both ends of the plug connector. A further embodiment of particular interest in the invention is that the steel clamping ring is arranged in the second bearing recess open at the edge with axial and radial clearance when the union nut is screwed in and the plug-in end of the plastic tube is not plugged in against the plug-in connector. This steel clamping ring is clamped in the opposite cone by the end of the plastic tube, and when the pulling end of the plastic tube is subjected to a tractive force. This particular embodiment has the advantage that the plug-in end of the pipe can be plugged into the plug-in coupling also when the union nut is screwed on, and the union nut must only be unscrewed to release the plug-in end connection of the pipe in the plug-in coupling.

Preferably, this embodiment is provided at both ends of the plug connector.

In this particular embodiment, if a support cone is provided on the support cone ring and the support cone ring is inserted into an open second receptacle open at the edge together with the steel clamping ring, the second receptacle recess is preferably divided into two partial sections lying in the longitudinal direction of the plug overhead couplings, on a steel clamping ring and a conical support ring. The upper part for the clamping support cone ring is separated from the lower part by a shoulder on which the support cone ring rests over the steel clamping ring, so that the steel clamping ring has a certain axial play against the longitudinal axis of the plug coupling. Preferably, in this embodiment, the steel clamping ring has a cylindrical portion below the clamping cone on the outer circumferential side. This makes it possible that the wall thickness of the plug coupling sleeve in the associated partial section of the second receiving recess need not be reduced too much. It is also possible that one embodiment may be provided at one end of the male connector and the other embodiment at its other end.

However, it is also possible that at the end of the sleeve, the steel clamping ring is inserted into a first receiving recess remote from the respective front edge formed in the inner wall of the sleeve and provided with a support cone, the steel clamping ring clamping the plugged end of the plastic tube against the return pulling under the effect of friction between the clamping cone and the opposite cone. The plug connector according to this embodiment makes it possible to insert the plug-in end of the plastic tube into one end without any other thing, the plug-in plug-in end being fixed only by simply plugging in without requiring the union nut. In this end portion of the plug connector according to the invention, the clamping is performed by the friction effect itself in an attempt to pull out the plug end of the pipe. Here, the clamping takes place quite automatically. This embodiment of the invention also has the advantage that only one union nut is required for the other end of the plug connector.

It will be understood that sealing measures may also be provided for the plug connector according to the invention, for which purpose sealing rings are provided at suitable locations. In this connection, according to a further preferred embodiment of the invention, in the end portions of the sleeve, receiving grooves and seating surfaces for the lip seals, consisting of a trapezoidal cross-section support ring and sealing lips formed thereon, are inserted in the insertion direction of the plug ends. groove. It is recommended to provide a stop on the male ends of the plastic pipes in the middle of the plug coupling. In this way, it is possible to adjust the insertion depth required for the plug-in pipe ends, which is necessary from a functional point of view.

BRIEF DESCRIPTION OF THE DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS The invention will now be described in more detail with reference to the accompanying drawings, in which: FIG. 1 shows an exploded view of one embodiment of a male coupling according to the invention with a cap nut in cross-section, with a steel clamping ring in cross-section and a supporting cone ring in cross-section, FIG. 2 shows a longitudinal section through a plug connector according to the invention with inserted steel clamping rings and with a conical support ring inserted, with the plug-in ends of the plastic pipes inserted at a very enlarged scale compared to FIG. 1, FIG. 3 shows detail A of FIG. 2 on an enlarged scale, FIG. 4 shows detail B of FIG. 2 on an enlarged scale, FIG. 5 similar to FIG. 2 is an enlarged longitudinal section through a further embodiment of a male coupling according to the invention with inserted steel clamping rings and an inserted conical ring, but without inserted plastic tubes; FIG. 6 shows detail C of FIG. 5 to a larger scale and FIG. 7 is a perspective view of a steel clamping ring of a plug connector according to the invention.

DETAILED DESCRIPTION OF THE INVENTION

The plug connector 1 shown in the accompanying figures is intended to connect two plastic pipes. These plastic pipes are mainly cable routing pipes and are intended to be laid in the ground. The basic components of the plug connector 1 include a sleeve 2 open at opposite end edges and one clamping device 3, 4 in the end parts of the sleeve 2. The control devices of these clamping devices 3, 4 will be explained in more detail. into the end portions of the sleeve 2 as shown in FIG. 2. These plug-in ends 5 are fastened to the sleeve 2 by the clamping device 3 or 4 in the plugged-in state. The clamping device 3 or 4 each comprises a steel clamping ring 7 equipped with a functional notch 6, on the outer circumference with a clamping cone 8 and on the inner circumference clamping rib 9, see FIG. 7th

In FIG. 1 to 4 show one embodiment of a plug connector 1 according to the invention, in which one side of the plug connector 1 is provided with a clamping device 3 and the other side with a clamping device 4. In an embodiment with a clamping device 4, one steel clamping ring 7 is inserted into the first a receiving recess 10 spaced from the respective front edge of the sleeve 2 and formed in the inner wall of the sleeve 2 and

In the embodiment with the clamping device 3, the second steel clamping ring 7 is inserted into the second receiving recess 12, hereinafter referred to as the receiving recess 12, open at the edge disposed at the opposite end of the sleeve 2 on its front side, the second the steel clamping ring 7 cooperates with a support cone 11 formed on the support cone ring 13. The steel clamping ring 7 is inserted into a receiving recess 19 open at the edge, with the support cone ring 13.

The arrangement is such that the steel clamping ring 7 arranged in the first receiving recess 10 clamps or closes the plug-in end 5 against retraction due to the resulting friction of the clamping cone 8 supported by the supporting cone 11. The steel clamping ring 7 arranged in the receiving cone 7 12 is retained in the receiving recess 12 open on the edge by means of a cap nut 14 screwed onto the respective end portion of the sleeve 2, so that in this state the plug-in end 5 is secured against retraction by friction of the clamping cone 8 resting on the support cone 11 In the illustrated embodiment, the cap nut 14 is provided with a stop shoulder 15 on the support cone 13 arranged in a receiving recess 12 open at the edge. The steel clamping ring 7 and the support cone ring 13 are clamped by screwing on the union nut 14. This clamping can be omitted when the shaped recesses 13a, as shown in FIG. Third

In FIG. 5 and 6 show an embodiment of the coupling 1 according to the invention of particular importance, in which both ends of the plug coupling 1 are provided with a clamping device 3. This embodiment comprises a combination of the following features:

In both end portions of the sleeve 2, one steel clamping ring 7 is inserted, respectively, into a recess 12 open at the edge, which cooperates with a support cone 11 formed on the support cone ring 13. The steel clamping ring 7 is inserted into the recess 12 open the steel clamping ring 7 and the supporting cone ring 13 are clamped by means of a cap nut 14 screwed onto the end portion of the sleeve 2. The cap nut 14 is provided in the illustrated embodiment with a stop shoulder 15 on the support cone ring. 13. The plugged-in plug-in end 5 of the plastic tube is held against retraction by the action of friction between the clamping cone 8 and the support cone 11 on the support cone ring 13. In this embodiment, the steel clamping ring 7 is screwed on the union nut 14 and without the plastic tube plug-in end 5 with respect to the male connector 1 in the receiving recess 12 open on the edge with axial and radial clearance and when the plastic tube plug-in end 5 is plugged The steel clamping ring 7 is gripped by the pulling force of the plastic tube, so that it is clamped in the support cone 11.

By this pulling force, the steel clamping ring 7 is pulled into the support cone ring 13 abutting the stop shoulder 15 of the union nut 14, and the clamping cone 8 of the steel clamping ring 7 is clamped in the opposite cone 11 on the support cone ring 13. in the illustrated embodiment divided in the longitudinal direction of the plug connector 1 into two superimposed sub-sections

22, 23 for the steel clamp ring 7 and the support cone ring 13. The upper sub-section 22 for the support cone ring 13 is separated from the lower sub-section 23 by a shoulder 24 on which the support cone ring 13 rests over the steel clamp ring 7 so that the steel clamp the ring 7 has an axial play in the longitudinal axis of the plug coupling 1. In the illustrated embodiment, the steel clamping ring 7 has a cylindrical section 25 below the clamping cone 8 provided on the outer periphery. Such a steel clamping ring 7 is also shown in FIG. 7 in a perspective view. This makes it possible that the wall thickness of the sleeve 2 does not have to be reduced too much in the associated section 26 of the recess 12 open at the edge.

FIG. 3, 4 and 6, it is evident that the clamping ribs 9 have a cross section in the form of a notch. FIG. 7, it is clear that the steel clamping ring 7 is provided with a functional notch 6 preferably arranged at an angle of about 45 [deg.] To the longitudinal axis of the plug connector 1. As aforesaid, in particular, a firm fastening of the steel clamping ring 7 pipe. FIG. 6 shows that, in the illustrated embodiment, the two front edges of the sleeve 2 are provided with a bevel 27 formed on the inner periphery of the front edge of the sleeve 2.

FIG. 2 and 5 it can be seen that in the end portions of the sleeve 2 in the insertion direction of the plastic tube plug-in ends 5, the grooves 16 and the seating surfaces 17 for the lip seals 18 are formed before or after the recess 10 or the recess 19 The support ring 19 is inserted into the receiving groove 16. In the middle part of the plug connector 1, a stop shoulder 21 can be seen on the plug ends 5 of the plastic tubes. The lip seal 18 allows the use of the plug connector 1 according to the invention also in pipes where there is overpressure or underpressure. It is understood that with the plug-in ends 5 of the plastic tubes, the plug-in coupling 1 can rotate about its axis.

Claims (11)

PATENT CLAIMS Plug connector (1) for connecting two plastic pipes with two plug ends (5) inserted in a plug connector (1), with a sleeve (2) open at opposite front edges, with one clamping device (3) at each end of the sleeve (2) and with flap seals (18) arranged downstream of the clamping device (3) in the insertion direction of the plug ends (5), wherein the clamping device (3) and the flap seal (18) are arranged in the recess of the sleeve (2); (3) comprises a steel clamping ring (7) provided with a notch (6) which is circumferentially provided with a clamping cone (X) and on the inside with at least one clamping rib (9), characterized in that the steel clamping ring (7) is inserted in a rim opening (12) provided with a support cone (11), a steel clamping ring (7) disposed in the rim opening (12) is mounted in by this receiving recess (12) open at the edge by means of a cap nut (14) screwed onto a corresponding end portion of the sleeve (2), a flap seal (18) consisting of a trapezoidal support ring (19) and a shaped sealing lip (20) protruding from the support ring ( 19) in the insertion direction, and is arranged in a recess comprising a bearing groove (16) and a bearing surface (17), the support ring (19) being inserted into the bearing groove (16) and the sealing lip (20) abutting the bearing and the plug-in end (5) inserted is fixed by the interaction of the clamping cone (8) with the support cone (11). Plug connector according to claim 1, characterized in that the clamping rib (9) has a cut-out cross-section. Plug connector according to claim 1 or 2, characterized in that the steel clamping ring (7) is provided with an inclined functional notch (6) inclined at an angle of about 45 ° to the longitudinal axis of the plug connector (1). Plug connector according to one of Claims 1 to 3, characterized in that at least one front edge of the sleeve (2) is provided with a bevel (27) of about 45 ° on the inner circumference. Plug-in connector according to one of Claims 1 to 4, characterized in that a support cone (11) is provided on the support cone ring (13) arranged in the edge-open receiving recess (12) and the support cone ring (13) is inserted. with a steel clamping ring (7) into a receiving recess (12) open at the edge. Plug connector according to one of Claims 1 to 5, characterized in that the union nut (14) is provided with a stop shoulder (15) on the steel clamping ring (7) or a conical support ring (13) arranged in the receiving recess (12). ) on the edge. Plug-in connector according to one of Claims 1 to 6, characterized in that the steel clamping ring (7) and the support cone (11) are clamped by screwing on the union nut (14). Plug-in connector according to one of Claims 1 to 6, characterized in that the steel clamping ring (7) is arranged in the receptacle with the union nut (14) screwed in and the plug-in end (5) of the plastic tube not connected. the recess (12) open at the periphery with axial and radial play and is pushed in by the plug-in end (5) of the plastic tube and, when the pulling end (5) of the plastic tube is exerted by pulling force, this steel clamping ring (7) is in the support cone (11) clamped. Plug connector according to claim 8, characterized in that the steel clamping ring (7) has a cylindrical section (25) below the clamping cone (8) provided on the outer periphery. Plug connector according to claim 8 or 9, characterized in that the embodiment according to claim 8 is provided at both ends of the plug connector (D · Plug connector according to one of Claims 1 to 10, characterized in that a stop shoulder (21) for the plug ends (5) is arranged in the central part of the plug connector (1).