Biplastic pipe

FIELD: plastic pipes.

SUBSTANCE: in proposed biplastic pipe with inner layer made of thermoplast, outer layer of glass plastic and stiffening ribs secured on outer surface of inner layer, height of stiffening ribs h is determined by formula h>Δα·Δt·din, where Δα is different of 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 layer of thermoplastic outer layer of fiberglass and annular ribs fixed to the inner layer (patent RF №1691645, F 16 L 9/12, 17.08.89). By virtue of the known device is the mechanical connection of the inner and outer layers of the pipe with ribs, which increases the reliability and durability of the pipe. A disadvantage of the known device is the low reliability and lack of strength when pumping liquids with changing temperature. When the temperature of the pumped fluid of the inner and outer layers of the pipe will be ugly is taken due to thermal expansion of the material. But since the coefficient of thermal expansion of thermoplastic always several times larger than the coefficient of thermal expansion of the laminate, the first lengthened considerably more than the second. When heated annular ribs preclude longitudinal movement of the outer and inner layers relative to each other in the axial direction. When cooled, the inner layer pipe made of thermoplastic, is reduced in diameter more than the outer, made of fiberglass, resulting in a coupling of the outer and inner layers is disrupted, as between them a gap which the edges of the inner layer out of the outer grooves. While the inner and outer layers are not already working as one - pipe. This reduces the strength and reliability of the pipe, results in its destruction. In addition, the implementation of ribs in the form of rings ensures the contact of the outer and inner layers only in some sections and not the entire length of the pipe, which also reduces the strength and serviceability of the pipe.

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 ribs, Zack is alannya on the outer surface of the inner layer, in the present invention offers the height of the ribs 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 ribs 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 ribs made in a spiral; figure 3 is an external view of the internal part of the tube with ribs made on spirals with opposite direction.

Offer bipustulata tube includes an inner layer 1 of thermoplastic outer layer 2 made of fiberglass and ribs 3, performed on the outer surface of the inner layer 1. The ribs 3 are grooves 4, made on the inner surface of the outer layer 2. To obtain a rigid structure, perceiving both radial and axial loads between the ribs 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. the 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 αdrug- 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 height of the ribs h>Δ α • Δ t• dintwhere Δ α =αint- αdrug; Δ t=t2-t1then there are h>Δ dint-Δ ddrugthey will be engaged with the grooves 4, 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 medium. The implementation of the ribs 3 in a spiral provides coupling them with the grooves 4 on the entire length of the pipe. The implementation of the ribs 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 each of which have a relatively friend, which increases the strength and reliability of the pipe.

1. Bipustulata tube containing an inner layer of thermoplastic outer layer of fiberglass and ribs mounted on the outer surface of the inner layer, characterized in that the height of the ribs 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 ribs are made on spirals.

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



 

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