MXPA99010628A - Pressure connector for pipes - Google Patents

Abstract

The invention relates to a pressure connector for pipes, comprising a pressure fitting having at least one section that is bulged crosswise and which accommodates a sealing ring, in addition to a first cylindrical section connected thereto and facing the insert side, a second cylindrical section facing away from the insert side forming a stop and exhibiting a smaller internal diameter than the first cylindrical section, and a line pipe whose smooth end area comes to rest on the stop of the second cylindrical section of the pressure fitting once it has been inserted into said pressure fitting. A fixed, tight pressure connection is formed using a pressure tool with at least two pressure cheeks encompassing the pressure fitting upon closure. During pressing, the pressing cheeks act upon the annular bulge and the sealing ring fitted therein, in addition to the first cylindrical section of the pressure fitting. The invention provides that the steep running side (8) of the annular bulge (4) facing the second cylindrical section (9) runs into the above-mentioned section (9) in a rounded form, devoid of irregularities. The internal diameter (10) of the second cylindrical section is the same as the internal diameter (13) of the inserted line tube (3) with a tolerance width of plus one half of the thickness of the wall (15) to minus 1 x the wall thickness of the inserted line pipe (3).

Description

PRESSED TUBULAR CONNECTION Description of the invention The invention relates to a pressed tubular connection comprising a pressure coupling and a tube inserted therein and inseparably connected thereto, in accordance with the preamble of claim 1. A tubular connection Pressing of the type under consideration is known from JP 55-88939. It is constituted by a pressure coupling having at least one bulge-shaped section that in cross section houses a sealing ring, and then a first section of cylindrical configuration, oriented towards the insertion side. On the other side of the annular bulge there is provided a second section of cylindrical configuration having a smaller inner diameter, so as to form a stop. The transition from the annular bulge to the second section of cylindrical configuration is carried out through a discontinuity that extends horizontally and transforms rounded in the two sections to the adjacent. In this the discontinuity serves as a guide to the tube that is introduced. After insertion, the end flat end area of the tube to be connected comes to rest against the stop of the second cylindrical configuration section.

By means of a pressing tool with two or more radial pressing jaws surrounding the pressure coupling, a sealed, inseparable pressed tubular connection is formed after closing the pressing jaws, while during compression the pressing jaws act both on the annular bulge, including the sealing ring inside it positioned, as well as on the first cylindrical configuration section of the pressure coupling. The disadvantage of this pressed tubular connection is that due to the discontinuity between the annular bulge and the second section of cylindrical configuration a relatively long horizontal extension gap is formed which can be moistened by the medium that is transported through the pipe. In this gap harmful substances can be concentrated even during the operation of the pipe system because it is not possible that a washing effect exists at that point. These harmful substances can attack the material of the tube and / or the pressure coupling. This is true in particular in the case of industrial application, in which carrier liquids are transported intermixed with the most diverse substances through the pipe system. Another type of pressed tubular connection is known from document US-3, 596, 939. It comprises a pressure coupling having at least one bulging section which in cross section houses a sealing ring, and then a sealing ring. first section of cylindrical configuration oriented towards the insertion side, as well as a second cylindrically shaped section remote from the insertion side, both having the same internal diameter, as well as following the annular bulging a groove directed towards the inside that , forming a stop for the tube to be inserted, it becomes rounded in the second cylindrical section. The stagnation is carried out when the sealing ring protruding into the interior space of the pressure coupling is compressed by the inserted tube. So that the sealing ring can not be pushed out of position or damaged, the front side of the tube to be inserted is machined. The axial securing of this connection is effected by means of a printed imprint in the first cylindrical section by means of a pressing tool. The disadvantage of this construction is that the dimensions of the pressure coupling, sealing ring and insertion tube must be adjusted against each other within narrow limits and that a conventional tube with wide tolerances can not be used. The additional elaboration of the front face of the tube to be inserted is inconvenientby means of this a relatively long gap is formed in connection with the stop groove. The pressures that can be transmitted are limited due to the sealing system. The task of the invention consists in perfecting a pressed tubular connection of the type under consideration so that in addition to the use in the sanitary installations it is also suitable for pipe systems of the industrial area with high internal pressures, by means of the use of conventional pipes for pipes. This task is solved from the preamble with the characteristics indicated in the distinctive section of claim 1 of the patent. Advantageous improvements are a constituent part of the subordinate claims. According to the invention, it is proposed that, apart from the internal guide for the tube to be inserted, the flank of the vertically extending annular bulge facing the second section of cylindrical configuration will be rounded, without a discontinuity, in the section mentioned. In the ideal case there is practically no gap formed by direct metal contact between the front surface of the inserted tube and the stop of the second cylindrically shaped section. Since, taking into account manufacturing tolerances and inaccuracies, the aforementioned surfaces are not precisely parallel plane, at some points of the circumference a radial gap will still be formed, which however is significantly smaller than the long common horizontal gap up to the date. To ensure the stop for the tube to be inserted, the internal diameter of the second section of cylindrical configuration is equal to the internal diameter of the inserted tube. Taking into account the tolerances it is possible to deviate upwards by more than half a wall thickness and down to once the wall thickness of the inserted tube. So that in the case of extreme applications, even the smallest radial gap does not represent a problem, a sealing lip extending towards the interior is provided in the sealing ring. This sealing lip is disposed in a manner that "comes to rest between the front side of the tube, inserted and the top of the second section of cylindrical configuration, thereby ensuring that harmful substances can no longer be concentrated in this area. -transported with the carrier liquid. The contour of the sealing lip is conveniently chosen so that the entire area of the seal is bathed so that no back-ups can occur. In the sense of an artisanally satisfactory shaping of the pressed tubular connection, it is also proposed to provide an obstacle to the extraction in the pressed tubular connection. This is intended to ensure that after inserting the tube and before the compression that fixes this mounting situation, do not inadvertently move back a little the tube and therefore a gap is formed again. For this purpose, it is proposed to configure the end area of the first section of cylindrical configuration in an angled form and to have on it a fastening element which prevents the inserted tube from being extracted. Preferably, this fastening element is configured as an elastically flexible annular bushing, which with the inside edge prevents the inserted tube from moving back without application of force. So that during the transportation of the pressure couplings to the mounting site, the ring-shaped sockets placed are not lost, they have at least one inwardly directed shroud which can be locked in a corresponding recess in the end region of the second section. of cylindrical configuration. The advantage of the proposed tubular connection is that the formation of a gap in the contact area between the inserted tube and the pressure coupling wettable by the medium to be transported is avoided in a simple manner and that An obstacle to extraction is also prevented from inadvertently forming an interstitium.

As the material for the tubular press connection proposed, stainless steel is preferably used as material, both for the pressure coupling and also for the pipe. This is suitable for a wide range of liquids to be transported in the sense of sufficient protection against corrosion. In the drawing, the pressed tubular connection configured according to the invention is explained in more detail based on several examples of embodiment: They show: FIG. 1 a longitudinal section through a tubular connection configured in accordance with the invention, FIG. 2 as FIG. 1, but after compression, FIG. 3 as FIG. 1, but with a modified sealing ring, FIG. figure 4 as figure 3, but with an additional obstacle to extraction, figure 5 the obstacle to extraction on a larger scale. 1 shows a longitudinal section through a tubular connection configured in accordance with the invention, and in FIG. 2 the same tubular connection pressed after compression. It comprises a pressure coupling 1 with a sealing ring 2 placed inside, as well as a tube 3 inserted in the pressure coupling 1. In known manner, the pressure coupling 1 has a section 4 configured in a bulged shape through a flank 5 is transformed into a first section 6 of cylindrical configuration which is in the direction of insertion. The direction of insertion is indicated by an arrow 7. On the other side of the section 4 configured in a domed shape, the flank 8 having a steeper slope is transformed according to the invention without a discontinuity into a second section 9 of cylindrical configuration . This section 9 has a smaller internal diameter 10 than the first section 6 of cylindrical configuration. By this a stop 12 is formed for the tube 3 to be inserted. In the ideal case the internal diameter 10 of the second section 9 of cylindrical configuration is equal to the internal diameter 13 of the inserted tube 3. In the case of a constellation, this would result in a smooth passage opening free of turbulence for the medium that should flow. The gap 14 (here represented in an exaggeratedly large form) that can still be wetted by the medium is radial and is much smaller than the horizontal extension gap known from the prior art. Taking into account tolerances and inaccuracies in manufacturing, the inner diameter 10 of the second cylindrical configuration section can have the tolerance of more, specifically up to a wall thickness 15, or less tolerance of up to all the wall thickness 15 of the inserted tube 3. Figure 3 shows a variant of the pressed tubular connection configured in accordance with the invention, being that the same reference symbols were used for equal parts. To seal the gap-which can still be wetted by the medium, the sealing ring 16 has a peripheral sealing lip 17 extending inwardly. This is disposed so that it becomes seated between the front surface 18 of the inserted tube 3 and the stop 12 of the second section 9 of cylindrical configuration. By this it is ensured that the harmful substances contained in the flowing medium can no longer be concentrated in this zone. In figures 4 and 5 another variant with an obstacle to extraction is represented. Again, the same reference symbols were used for the same parts. To prevent the inadvertent formation of a gap due to an involuntary separation of the tube inserted from the stop, an annular bushing 20 is fastened on it on the angled end area 19 of the first section 6 of cylindrical configuration. This bushing is constituted by an elastically flexible material, for example steel for springs, so that when the pipe 3 is released, the edge 21 below is pressed upwards. But if instead it is a matter of moving back the tube 3 after inserting it, then the region 21 of the edge engages the surface 22 of the tube jacket and retains it. So that during the transport of the pressure couplings 1, the pre-positioned bushing is not lost, it has for example several shrouds 23, 23 'directed towards the inside. These shrouds 23, 23 'are locked in corresponding recesses 24, 24' configured in the manner of half rods which are arranged on the upper and lower sides of the angled end region 19 of the first section 6 of cylindrical configuration. Of course other forms of transport insurance are also possible and usable.

Claims (7)

1. CLAIMS 1. Pressed tubular connection comprising a pressure coupling having at least one bulging section that in cross section houses a sealing ring, and thereafter a first section of cylindrical configuration facing the insertion side, as well as a second section of cylindrical configuration remote from the side of the insert, which forming a stop has a smaller inner diameter than the first section of cylindrical configuration, the inside diameter of the second section of cylindrical configuration being equal to the inside diameter of the cylindrical configuration. inserted tube, and a tube whose end region of flat termination comes to rest against the stop of the second section of cylindrical configuration of the pressure coupling after its insertion in the pressure coupling, being that by means of a pressing tool that surrounds the coupling of pressure with at least two clamps Radial adobe forms a tight sealed tubular connection, inseparable after closing, being that during compression the pressing jaws act both on the annular bulge, including the sealing ring inside it placed, as well as on the first section of cylindrical configuration of the coupling of pressure, this pressed tubular connection being characterized by the fact that the flank of the annular bulge extending vertically oriented towards the second section of cylindrical configuration, becomes rounded in the mentioned section without forming a horizontal gap extending in axial direction, being that the inner diameter of the inserted tube is within the tolerance range of more than half the wall thickness at least 1 x - the wall thickness of the inserted tube.
2. 2. Pressed tubular connection according to claim 1, characterized in that the sealing ring has a peripheral sealing lip extending towards the interior which comes to rest between the front side of the inserted tube and the • stop of the second section of cylindrical configuration.
3. Pressed tubular connection according to claim 1 or 2, characterized in that the end area of the first cylindrical configuration section of the pressure coupling is angled outwards, and on it an elastically flexible fastening element can be mounted. which avoids the movement of extraction of the inserted tube.
4. 4. Pressed tubular connection according to claim 3, characterized in that the fastening element is configured as an annular bushing with at least one mortise extending towards the inside.
5. 5. Pressed tubular connection according to claim 4, characterized in that the annular bushing has on both internal sides at least in each case a mortise.
6. 6. Pressed tubular connection according to claim 5, characterized in that several shrouds were distributed along the circumference. Pressed tubular connection according to one of claims 4 to 6, characterized in that the angled end area of the first section of cylindrical configuration has a less half-shell casting suitable for interlocking the mortise afterwards. the annular cap must be mounted. SUMMARY The invention relates to a pressed tubular connection comprising a pressure coupling having at least one bulge-shaped section that in cross-section houses a sealing ring, and thereafter a first section of cylindrical configuration oriented towards the sealing side. the insertion, as well as a second section of cylindrical configuration remote from the side of the insertion, which forming a stop has a smaller inner diameter than the first section of cylindrical configuration, and a tube whose end region of flat termination comes to rest against the stop of the second section of cylindrical configuration of the pressure coupling after its insertion in the pressure coupling, being that by means of a pressing tool that surrounds the pressure coupling with at least two radial pressing jaws, a tight sealed tubular connection is formed, inseparable after closing, while during compression the pressing jaws act both on the annular bulge, including the sealing ring inside it placed, as well as on the first section of cylindrical configuration of the pressure coupling. It is proposed that the flank (8) of the vertically extending annular bulge (4) facing the second section (9) of cylindrical configuration, is transformed rounded in the section (9) mentioned without a discontinuity, the diameter (10) being ) inside the second section (9) of cylindrical configuration is equal to the inner diameter (13) of the tube (3) inserted within the tolerance range of more half wall thickness (15) at least 1 x the wall thickness of the tube (3) inserted. For this figure 2