RU136120U1 - END CONNECTION OF FLEXIBLE POLYMERIC REINFORCED PIPE - Google Patents

Abstract

1. The end connection of a flexible polymer-reinforced pipe, comprising a hollow body with an opening for a fitting, a fitting with a flexible polymer-reinforced pipe placed on it, an o-ring made of soft elastic material, characterized in that the flexible polymer-reinforced pipe consists of an internal polymer pipe on top of which one or more metal braids are wound, having a circular cross-sectional shape, on which an outer shell made of a polymeric material is applied, between the inner polymer one or two layers of a metal tape having, for example, a rectangular cross-sectional shape, a metal braid at the end of a flexible polymer-reinforced pipe exposed to a length exceeding the width of the crimp annular groove made on the outer surface of the fitting, can be laid with a metal tube and a metal braid, annular grooves are made on the outer surface of the first end of the fitting, which have the shape of a rectangular trapezoid, turned by an acute angle α = 25 ° -65 ° to the second end of the fitting, the outer surface of the second the end of the nozzle can be made smooth or threaded, a sealing annular groove adjoins it, a restrictive collar adjacent to the sealing annular groove located relative to it closer to the first end of the nozzle, an installation collar adjacent to the annular grooves located relative to them closer to the second end of the nozzle is crimped the annular groove is located between the restrictive and installation flanges, a fitting is inserted into the central through hole of the flexible polymer-reinforced pipe until it stops

Description

The utility model relates to the oil, gas and related industries and can be used to connect flexible polymer-reinforced pipes of industrial equipment or to connect flexible polymer-reinforced pipes to structural elements.

Known pipe connection [Australian patent No. 4221968 "Improvements regarding pipe couplings"], which consists of a fitting with an external thread, an elastically deformable sleeve and a union nut. An elastically deformable metal sleeve is put on the pipe, having annular beads on the inner surface. When the nut is screwed onto the fitting, the sleeve is axially compressed and radially deformed, with annular collars being introduced into the pipe body. This ensures the fastening and sealing of the pipe in the connection.

The disadvantage of this pipe connection is the perception of low axial loads. The low values of the perceived axial loads are associated with the fact that the design of the pipe connection does not include elements designed for fastening the braid of a flexible polymer-reinforced pipe, as a result of which the permissible axial load of this connection directly depends on the strength characteristics of the polymer material included in the flexible polymer reinforced pipe. In well-known literature it is shown that the polymeric materials from which flexible polymer-reinforced pipes are made (for example, polyethylene, vinyl plastic) do not have high strength.

Closest to the claimed device is the device shown in [RF patent No. 2450200 "Connection of a flexible hose with a rigid element"], containing a hollow body of a rigid element with an opening for a fitting, a fitting with a thickening in the middle part and a hose placed on it, a clamping nut, moreover, the thickening on the fitting is made with conical end surfaces and has a trapezoidal shape of a longitudinal section, and the hole for the fitting is made stepwise and has a diameter equal to the starting diameter of the piece from the side of the body cavity ra with a hose, and also has a conical transition to a diameter equal to the diameter of the thickened part of the fitting with a hose on it. The thickening on the nozzle, having a trapezoidal shape in longitudinal section, is made in the form of an isosceles trapezoid with an angle at the base of 45 ° to 50 °, an o-ring made of soft elastic material adjacent to the outer surface of the tube is placed on the non-thickened part of the fitting from the side of the clamping nut on the conical part of the nozzle thickening, and between the sealing ring and the clamping nut, a washer is installed in the form of a flat ring of rigid material, and the end surface of the clamping nut is made flat along the shape of the washer.

The disadvantages of this connection are the low degree of tightness, as well as the perception of low axial loads. The low values of the perceived axial loads are due to the fact that the design of the connection does not include elements designed for attaching the braid of a flexible polymer-reinforced coarse material, as a result of which the permissible axial load of this connection directly depends on the strength characteristics of the material of which the flexible polymer-reinforced pipe is made . In well-known literature it is shown that the polymeric materials from which flexible polymer-reinforced pipes are made (for example, polyethylene, vinyl plastic) do not have high strength. A low degree of tightness is due to the fact that during the assembly of the pipe connection in the hose residual deformations are formed, which leads to the appearance of gaps between the hose and the housing, as well as between the hose and the fitting.

The inventive device is intended for connecting flexible polymer-reinforced pipes with structural elements or for attaching industrial equipment to them.

The technical result of the claimed device is to increase the tightness of the end connection of a flexible polymer-reinforced pipe by introducing into its design sealing elements (O-rings) that seal the space between the housing and the fitting and prevent the penetration of the external environment (for example, fluid) into the end connection, and but to increase the axial load perceived by the end connection due to the fact that the polymer material bends tightly to the fitting (crimped) oh polymer-reinforced pipe and its sheathing (e.g. steel wire) so that the axial load is taken as a braid and the polymer.

The technical result of the claimed device is achieved in that the end connection of a flexible polymer-reinforced pipe contains a hollow body with an opening for a fitting, a fitting, with a flexible polymer-reinforced pipe placed on it, an o-ring made of soft elastic material. What is new is that a flexible polymer-reinforced pipe consists of an inner polymer tube, on top of which one or more metal braids are wound, having a circular cross-sectional shape, on which an outer shell made of a polymeric material is applied between the inner polymer tube and the metal braid one or two layers of a metal tape having, for example, a rectangular shape in cross section can be laid, a metal braid at the end of a flexible polymer-reinforced pipe is exposed on a length exceeding the width of the crimping annular groove made on the outer surface of the nozzle, on the outer surface of the first end of the nozzle there are annular grooves that have the shape of a rectangular trapezoid, turned by an acute angle α = 25 ° -65 ° to the second end of the nozzle, on the outer surface of the second a threaded connecting surface is made at the end of the fitting, to which the sealing ring groove is adjacent, a restrictive collar adjacent to the first end is adjacent to the sealing ring groove the fitting, adjacent to the annular grooves is a mounting collar located closer to the second end of the nozzle, the crimping annular groove is located between the restrictive and mounting collars, the fitting is inserted into the central through hole of the flexible polymer-reinforced pipe into the end of the flexible collar in the end of the flexible polymer-reinforced pipe, where the metal braid is exposed, the exposed part of the metal braid is tucked into the crimp ring groove and is crimped from the outside by the crimp ring, into the o-ring a groove is installed an o-ring made of a sealing elastic material, the outer o-ring is tightly pressed by the shoulder of the housing, which is mounted on the outer surface of a flexible polymer-reinforced pipe and tightly attached to it (for example, crimped), a central through hole is made in the fitting, the diameter of which is smaller than the diameter of the through central hole of a flexible polymer-reinforced pipe.

To increase the reliability of the end connection of the flexible polymer-reinforced pipe and increase its tightness, annular grooves are made on the inner surface of the housing adjacent to the outer surface of the flexible polymer-reinforced pipe, which have the shape of a rectangular trapezoid, turned by an acute angle α = 25 ° -65 ° to the shoulder made on the inner surface of the housing. During compression, the annular grooves are filled with the polymer material of a flexible polymer-reinforced pipe, which allows for rigid fixing of the flexible polymer-reinforced pipe relative to the body and prevents the penetration of the external environment (for example, fluid) into the space between the internal surface of the body and the outer surface of the flexible polymer-reinforced pipe.

To expand the scope of the end connection of a flexible polymer-reinforced pipe, it can be made not with an external threaded surface, but with an internal threaded surface (union nut). In this case, from one end the nozzle has a smooth outer surface, which is adjacent to the flange located closer to the first end of the nozzle. A union nut is installed on the fitting to the stop in the flange for connecting the external threaded surfaces.

In FIG. 1 shows a general view of the end connection. In FIG. 2 shows a General view of the end connection, which includes a union nut. In FIG. 3 shows a cross section of a flexible polymer-reinforced pipe. In FIG. 4 shows a fitting. In FIG. 5 shows a fitting with a collar for a flare nut. In FIG. 6 shows the housing. In FIG. 7 shows a casing with annular grooves on its inner surface. In FIG. 8. shows the sequence of connection of the fitting to a flexible polymer-reinforced pipe.

The end connection of a flexible polymer-reinforced pipe contains a housing 1 (Fig. 1, Fig. 2, Fig. 6) with an opening for a fitting 2 (Fig. 1, Fig. 4), a fitting 2, with a flexible polymer-reinforced placed on it pipe (the prototype has a hose) 3 (Fig. 1, Fig. 2, Fig. 3), the o-ring 4 (Fig. 1, Fig. 2) made of soft elastic material. Flexible polymer-reinforced pipe 3 (Fig. 1, Fig. 2, Fig. 3) consists of an internal polymer tube 5 (Fig. 3), over which one or more metal braids 6 are wound (Fig. 1, Fig. 3), having a circular shape in cross section, on which the outer shell 7 (Fig. 3) is applied, made of a polymer material. Between the inner polymer tube 5 and the metal braid 6 (Fig. 1, Fig. 3) one or two layers of the metal tape 8 (Fig. 3) can be laid, having a rectangular cross-sectional shape. The metal braid 6 (FIG. 1, FIG. 3) at the end of the flexible polymer-reinforced pipe 3 (FIG. 1, FIG. 2, FIG. 3) is exposed to a length exceeding the width of the crimp annular groove 9 (FIG. 1, FIG. 4), made on the outer surface of the fitting 2 (Fig. 1, Fig. 4). On the outer surface of the first end of the nozzle 2 there are annular grooves 10 (Fig. 1, Fig. 2, Fig. 4), which have the shape of a rectangular trapezoid, turned by an acute angle α = 25 ° -65 ° to the second end of the nozzle 2 (Fig. 1 , Fig. 4). A threaded connecting surface 11 (Fig. 1, Fig. 4) is made on the outer surface of the second end of the fitting 2, to which a sealing ring groove 12 is adjacent. A sealing collar 13 adjacent to the sealing ring groove 12 is located closer to the first end of the fitting 2 (Fig. 1, Fig. 4). The annular grooves 10 (Fig. 1, Fig. 2, Fig. 4) are adjacent to the mounting collar 14 (Fig. 1, Fig. 4) located closer to the second end of the fitting 2 (Fig. 1, Fig. 4). The crimping annular groove 9 (Fig. 1, Fig. 4) is located between the restrictive and installation flanges 13, 14. In the central through hole of the flexible polymer-reinforced pipe 3 (Fig. 1, Fig. 2, Fig. 3), the fitting 2 ( Fig. 1, Fig. 4) to the stop of the mounting collar 14 (Fig. 1, Fig. 4) at the end of the flexible polymer-reinforced pipe 3 (Fig. 1, Fig. 2, Fig. 3), on which the metal braid 6 is exposed (Fig. 1, Fig. 3). The exposed part of the metal braid 6 is tucked into the crimp annular groove 9 (Fig. 1, Fig. 4) and is crimped from the outside by the crimp ring 15 (Fig. 1, Fig. 2). In the sealing ring groove 12 (Fig. 1, Fig. 4), the sealing ring 4 (Fig. 1, Fig. 2) is installed from a sealing elastic material, which is tightly pressed from the outside by a collar 16 (Fig. 1, Fig. 6) of the housing 1 ( Fig. 1, Fig. 2, Fig. 6). The housing 1 is mounted on the outer surface of a flexible polymer-reinforced pipe 3 (Fig. 1, Fig. 2, Fig. 3) and is tightly attached to it (for example, crimped). The diameter of the central through hole made in the fitting 2 (Fig. 1, Fig. 4) is 25-35% less than the diameter of the through central hole of the flexible polymer-reinforced pipe 3 (Fig. 1, Fig. 2, Fig. 3). For example, for a flexible polymer-reinforced pipe 3, the diameter of the central through hole of which is 20 mm., A fitting 2 is used (Fig. 1, Fig. 4) with the diameter of the central through hole equal to 15 mm.

It is also possible to make an end connection with rigid fastening of a flexible polymer-reinforced pipe relative to the housing. In this case, on the inner surface of the housing 1 (Fig. 1, Fig. 2, Fig. 7) adjacent to the outer surface of the flexible polymer-reinforced pipe 3 (Fig. 1, Fig. 2, Fig. 3), annular grooves 17 ( Fig. 7), which have the shape of a rectangular trapezoid, turned by an acute angle α = 25 ° -65 ° to the shoulder 16, made on the inner surface of the housing 1 (Fig. 1, Fig. 2, Fig. 7).

It is also possible to make an end connection with an internal threaded connecting surface (union nut). In this case, from the second end of the fitting 2 (Fig. 2, Fig. 5) has a smooth outer surface 18 (Fig. 2, Fig. 5), which is adjacent to the flange 19, located closer to the first end of the fitting 2 (Fig. 2, Fig. 5). On the fitting 2 is installed until it stops in the flange 19 (Fig. 2, Fig. 5) the union nut 20 (Fig. 2), which is designed to connect the external threaded surfaces.

Due to the fact that the end connection of the flexible polymer-reinforced pipe contains sealing elements that, when crimped, seal the space between the body and the nozzle, which avoids the penetration of the external environment into the end connection, as well as the annular grooves on the outer surface of the nozzle, which are filled with polymer material during crimping flexible polymer-reinforced pipe, significantly increases the tightness of the end connection. Due to the fact that both the polymeric material of the flexible polymer-reinforced pipe and its braid (for example, steel wire) are tightly attached (for example, crimped) to the fitting, the axial load is perceived by both the braid and the polymer, as a result of which this end connection is capable of to perceive significant axial loads.

The connection of the fitting to a flexible polymer-reinforced pipe is as follows. The fitting 2 (Fig. 1, Fig. 4, Fig. 8) (the prototype has a nipple shank) is equipped with a crimping annular groove 9 (Fig. 1, Fig. 4) (the prototype has an annular protrusion) and a sealing annular groove adjacent to it 12 (the prototype has annular grooves). Then the braid 6 (Fig. 1, Fig. 3, Fig. 8) from the end of the flexible polymer-reinforced pipe 3 (Fig. 1, Fig. 2, Fig. 3, Fig. 8) is exposed for a length exceeding the width of the crimp ring grooves 9 (Fig. 1, Fig. 4) of the fitting 2 (Fig. 1, Fig. 4, Fig. 8). Then, an axial assembly of the joint is carried out, during which a sealing ring 4 (Fig. 1, Fig. 2, Fig. 8) is installed in the sealing ring groove 12 (Fig. 1, Fig. 4), on the fitting 2 (Fig. 1, Fig. . 4, Fig. 8) concentrically (with a gap) set the compression ring 15 (Fig. 1, Fig. 2, Fig. 8), the end of the flexible polymer-reinforced pipe 3 (Fig. 1, Fig. 2, Fig. 3, Fig. 8) with a bare braid 6 (Fig. 1, Fig. 3, Fig. 8) are mounted on the annular grooves 10 (Fig. 1, Fig. 2, Fig. 4) of the fitting 2 (Fig. 1, Fig. 4, Fig. 8) until it stops in the mounting collar 14 (Fig. 1, Fig. 4) (the prototype has an annular protrusion), refueling under the crimp ring 15 (FIG. 1, FIG. 2, FIG. 8) the bare braid 6 (FIG. 1, FIG. 3, FIG. 8) of a flexible polymer-reinforced pipe 3 (FIG. 1, FIG. 2, FIG. . 3, Fig. 8). Then crimp the crimping ring 15 (Fig. 1, Fig. 2, Fig. 8) in the cam or collet fixture with straight cams 21 (Fig. 8), which provides a rigid fastening of the braid 6 (Fig. 1, Fig. 3, Fig. 8) on the fitting 2 (Fig. 1, Fig. 4, Fig. 8). Then on the fitting 2 from the side of the second end put on the housing 1 (Fig. 1, Fig. 2, Fig. 6, Fig. 7, Fig. 8) until it stops the collar 16 (Fig. 1, Fig. 6, Fig. 7) in the end face of the flexible polymer-reinforced pipe 3 (Fig. 1, Fig. 2, Fig. 3, Fig. 8) and produce compression of the housing 1 (Fig. 1, Fig. 2, Fig. 6, Fig. 7, Fig. 8) in a cam or collet fixture with straight cams 21 (Fig. 8). As a result, the polymer material is rigidly fixed in the flexible polymer-reinforced pipe 3 (Fig. 1, Fig. 2, Fig. 3, Fig. 8) in the annular grooves 10 (Fig. 1, Fig. 2, Fig. 4) made on the outer surface of the fitting 2 (Fig. 1, Fig. 4, Fig. 8) and on the inner surface of the housing 1 (Fig. 1, Fig. 2, Fig. 6, Fig. 7, Fig. 8), as well as the compression of the seal ring 4 (FIG. 1, FIG. 2, FIG. 8) located between the fitting 2 (FIG. 1, FIG. 4, FIG. 8) and the housing 1 (FIG. 1, FIG. 2, FIG. 6, FIG. . 7, Fig. 8), which ensures tight coupling of a flexible polymer-reinforced pipe 3 (f Ig. 1, Fig. 2, Fig. 3, Fig. 8) with a fitting 2 (Fig. 1, Fig. 4, Fig. 8).

It is also possible to make an end connection with an internal threaded connecting surface (union nut). In this case, before installing the flexible polymer-reinforced pipe 3 (Fig. 1, Fig. 2, Fig. 3, Fig. 8) on the fitting 2 (Fig. 2, Fig. 5, Fig. 8) on it from the side of the annular grooves 10 (Fig. 1, Fig. 2, Fig. 4) are installed all the way into the collar 19 (Fig. 2, Fig. 5) union nut 20 (Fig. 2).

Claims (3)

1. The end connection of a flexible polymer-reinforced pipe, comprising a hollow body with an opening for a fitting, a fitting with a flexible polymer-reinforced pipe placed on it, an o-ring made of soft elastic material, characterized in that the flexible polymer-reinforced pipe consists of an internal polymer pipe on top of which one or more metal braids are wound, having a circular cross-sectional shape, on which an outer shell made of a polymeric material is applied, between the inner polymer one or two layers of a metal tape having, for example, a rectangular cross-sectional shape, a metal braid at the end of a flexible polymer-reinforced pipe exposed to a length exceeding the width of the crimp annular groove made on the outer surface of the fitting, can be laid with a metal tube and a metal braid, annular grooves are made on the outer surface of the first end of the fitting, which have the shape of a rectangular trapezoid, turned by an acute angle α = 25 ° -65 ° to the second end of the fitting, the outer surface of the second the end of the nozzle can be made smooth or threaded, a sealing annular groove adjoins it, a restrictive collar adjacent to the sealing annular groove located relative to it closer to the first end of the nozzle, an installation collar adjacent to the annular grooves located relative to them closer to the second end of the nozzle is crimped the annular groove is located between the restrictive and installation flanges, a fitting is inserted into the central through hole of the flexible polymer-reinforced pipe until it stops installation collar at the end of a flexible polymer-reinforced pipe, on which the metal braid is exposed, the exposed part of the metal braid is tucked into the crimp ring groove and crimped by the crimp ring, the seal ring of the sealing elastic material is installed in the sealing ring groove, the seal ring is tightly pressed on the outside by the housing collar which is mounted on the outer surface of a flexible polymer-reinforced pipe and is tightly attached to it (for example, crimped), Neno central through hole whose diameter is smaller than the diameter of the central opening through a polymer-reinforced flexible pipe. 2. The end connection of the flexible polymer-reinforced pipe according to claim 1, characterized in that on the inner surface of the housing adjacent to the outer surface of the flexible polymer-reinforced pipe, annular grooves are made, which have the shape of a rectangular trapezoid, turned by an acute angle α = 25 ° -65 ° to the shoulder, made on the inner surface of the housing. 3. The end connection of the flexible polymer-reinforced pipe according to claim 1, characterized in that the nozzle has a smooth outer surface at one end, adjacent to a collar located closer to the first end of the nozzle, a union nut is installed on the nozzle against the stop in the collar external threaded surfaces.

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