Biplastic pipe

FIELD: plastic pipes.

SUBSTANCE: in biplastic pipe with inner layer made of thermoplast, outer layer made of glass plastic and grooves made on outer surface of inner layer, depth of grooves h is determined by formula h>Δα·Δt·din, where Δα is difference in coefficients of linear thermal expansion of materials of inner and outer layers; Δt is difference in maximum and minimum temperatures of transferred medium; din is outer diameter of inner layer.

EFFECT: improved strength and operation reliability of biplastic pipe.

3 cl, 3 dwg

 

The invention relates to the field of transportation of liquid environments on the tubes, in particular tubes of plastics used in various industries.

Known bielstrasse tubes containing internal, external and primer layers, while the inner layer is made from a thermoplastic, and the outer is made of fiberglass (RF patent No. 2095676, F 16 L 9/133, 18.07.1995). In the known construction the inner and outer layers of the pipe are connected to each other by means of the primer. However, as the experience of the use of such tubes during operation separates the layers of primer, resulting in reduced strength and serviceability of the pipe.

Known and adopted for the prototype bipustulata tube containing an inner and an outer part made of thermoplastic synthetic material and of thermoautotrophica synthetic material, while the outer surface of the inner part is made rough, the roughness may be in the form of bumps, elongated along the axis of the pipe, or in the form of transverse grooves (RF patent No. 2046242, F 16 L 9/12, 29.06.1990). By virtue of the known device is the mechanical connection of the inner and outer pipe sections using bumps or grooves, which increases the reliability and durability of the pipe. A disadvantage of the known device is the bottom of the traveler reliability and insufficient strength when pumping liquids with changing temperature. When the temperature of the pumped fluid of the inner and outer part of the pipe will lengthen due to thermal expansion of the material. But since the coefficient of thermal expansion of thermoplastic material is always several times higher than the coefficient of thermal expansion thermoautotrophica material, the first lengthened considerably more than the second. The longitudinal corrugations are not designed to hold the layers relative to each other along the axis. When heated transverse grooves preclude longitudinal movement of the inner and outer parts relative to each other in the axial direction. When cooled internal part of the pipe made of thermoplastic material, is reduced in diameter more than the outer, made of thermoautotrophica material, resulting in the coupling of the inner and outer parts is broken, as between them a gap which the edges of the outer side face of the internal grooves. While the inner and outer parts are not working as one - pipe. This reduces the strength and reliability of the pipe, results in its destruction. In addition, the implementation of the grooves in the form of rings provides a contact of the inner and outer parts in separate sections and not the entire length of the pipe, which also reduces the strength and reliability of the Tr the least.

The purpose of the invention is the increase of durability and operational reliability bielstrasse pipe.

This objective is achieved in that in the known bielstrasse tube containing an inner layer of thermoplastic outer layer of fiberglass and groove made on the outer surface of the inner layer, the present invention offers the depth of the grooves h to determine the formula h>Δ α • Δ t• dintwhere Δ α - the difference of coefficients of linear thermal expansion of the materials of the inner and outer layers; Δ t is the difference of the maximum and minimum temperatures of the pumped fluid; dint- outer diameter of the inner layer, and the grooves run in spirals, and spirals with opposite direction.

Figure 1 shows bipustulata pipe; figure 2 external view of the internal part of the tube with grooves made in a spiral; figure 3 is an external view of the internal part of the tube with grooves made on spirals with opposite direction.

Offer bipustulata tube includes an inner layer 1 of thermoplastic outer layer 2 made of fiberglass and groove 3, is made on the outer surface of the inner layer 1. In the groove 3 edges 4, made on the inner surface of the outer layer 2. For the floor is placed a rigid structure, perceiving both radial and axial loads in the grooves 3 can put the roving dipped in epoxy on top of him to put layers of stylorouge along the pipe axis, and the top winding of steelorbis.com in the radial direction. Each layer of roving wetted with epoxy resin.

Offer bipustulata pipe works as follows. When the cooling fluid temperature t2to t1the inner diameter of the outer layer (ddrugwill be reduced by the amount Δ ddrugdrug(t2-t1)• ddrugwhere ddrug- coefficient of thermal expansion of the outer layer 2. And the outer diameter of the inner layer dintwill be reduced by the amount Δ dintint(t2-t1)• dintwhere αint- coefficient of thermal expansion of the inner layer 1. As the depth of the groove h>Δ α • Δ t• dintwhere Δ α =αintdrug; Δ t=t2-t1then there are h>Δ dint-Δ ddrugthen the edges 4 will be in engagement with the grooves 3, which will provide a rigid connection of the external 2 internal and 1 layers. This increases the strength and reliability of the pipe temperature of the pumped among the s. The implementation of the grooves 3 in a spiral provides traction ribs 4 with grooves 3 on the entire length of the pipe. Running grooves 3 on spirals with opposite direction provides grip the entire length of the pipe and prevents the turning of the inner and outer pipe sections relative to each other, which increases the strength and reliability of the pipe.

1. Bipustulata tube containing an inner layer of thermoplastic outer layer of fiberglass and groove made on the outer surface of the inner layer, characterized in that the depth of the grooves h is determined by the formula

h>Δα·Δt·dint,

where Δα - the difference of coefficients of linear thermal expansion of the materials of the inner and outer layers;

Δt is the difference of the maximum and minimum temperatures of the pumped fluid;

dint- outer diameter of the inner layer.

2. Bipustulata pipe according to claim 1, characterized in that the grooves are made on spirals.

3. Bipustulata pipe according to claim 1, characterized in that the grooves are made on spirals with opposite direction.



 

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