CN111102419A

CN111102419A - Steel lining tetrafluoro pipe compensator

Info

Publication number: CN111102419A
Application number: CN201811270568.XA
Authority: CN
Inventors: 薛家伟; 谭银昌; 王东海
Original assignee: Hubei Shiji Weiye Anti Corrosion Technology Co ltd
Current assignee: Hubei Shiji Weiye Anti Corrosion Technology Co ltd
Priority date: 2018-10-29
Filing date: 2018-10-29
Publication date: 2020-05-05

Abstract

A steel lining tetrafluoro pipe compensator comprises a corrugated pipe, a flange and a tetrafluoro lining; the PTFE liner comprises a PTFE corrugated pipe body, a flanging and a connecting ring; the flanging and the connecting ring are hot-pressed into a whole; one end of the connecting ring is provided with a convex surface, the other end of the connecting ring is provided with a concave surface, the lower end of the concave surface is provided with an elastic sealing ring, and the elastic sealing ring is arranged in a groove on the end surface of the flange. The steel lining tetrafluoride pipe compensator provided by the invention can prolong the service life of the compensator.

Description

Steel lining tetrafluoro pipe compensator

Technical Field

The invention relates to the field of pipe corrosion prevention, in particular to a steel lining tetrafluoro pipe compensator.

Background

The expansion joint of the existing PTFE-lined corrugated pipe comprises flanges, a corrugated pipe and PTFE liners, wherein the corrugated pipe is fixedly connected with the flanges at two ends to form a corrugated pipe compensation structure, the PTFE liners are attached to the inner surface of the corrugated pipe, and the PTFE liners are formed by winding and sintering a PTFE film. The expansion joint of the PTFE-lined corrugated pipe can be used for a pipeline system to compensate the length, the temperature, the position and the angle, has certain corrosion resistance due to the PTFE lining, and can be widely applied to the pipeline system for conveying corrosive media. However, the expansion joint of the polytetrafluoroethylene-lined corrugated pipe has the following defects: the polytetrafluoroethylene lining sintered after the polytetrafluoroethylene film is wound has low density, poor elongation and easy small cracks, and influences the corrosion resistance of the corrugated pipe expansion joint.

The composite PTFE liner corrugated pipe compensator of the patent with the application number of '201310180110.6' attaches the PTFE liner to the inner surface of the corrugated pipe and presses the PTFE liner by a negative pressure ring, thus obviously improving the density and the elongation of the PTFE liner and having the characteristic of negative pressure resistance.

When the compensator also has several problems: 1) the integral structure that tetrafluoro inside lining was formed by tetrafluoro welt and tetrafluoro membrane complex, the turn-ups of tetrafluoro inside lining and ring flange junction is direct extrusion behind the intraductal hot melt of tetrafluoro inside lining a section length, and general turn-ups are shorter. For a large expansion joint (such as an expansion joint with the diameter of 5-6 meters), the flanging requirement is high, the diameter of the flanging after direct hot melting cannot be adapted to the outer diameter of the flange plate, the end face of the flange cannot be completely covered by the PTFE lining, the sealing property is affected, and strong acid and strong base corrode the flange plate, so that the service life of the compensator is greatly reduced; in addition, if the temperature difference of the working pipe is large or the mechanical vibration generated by the equipment during use is high, the stability of the compensator is greatly reduced.

Disclosure of Invention

The invention aims to provide a steel lining tetrafluoro pipe compensator, aiming at a large compensator, which can ensure that a tetrafluoro lining covers the end face of a flange plate completely, thereby ensuring the sealing property, achieving the purpose of complete corrosion resistance and further prolonging the service life of the compensator.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows:

a steel lining tetrafluoro pipe compensator comprises a corrugated pipe, a flange and a tetrafluoro lining; the PTFE liner comprises a PTFE corrugated pipe body, a flanging and a connecting ring; the flanging and the connecting ring are hot-pressed into a whole; one end of the connecting ring is provided with a convex surface, the other end of the connecting ring is provided with a concave surface, the lower end of the concave surface is provided with an elastic sealing ring, and the elastic sealing ring is arranged in a groove on the end surface of the flange.

The flange bilateral symmetry of upper and lower is equipped with the otic placode, is equipped with the screw rod on the otic placode, and the screw rod both ends are passed the flange and are spacing through first bolt, are equipped with second bolt, third bolt on the screw rod interlude, and the cover has expanding spring on the screw rod between second bolt, third bolt and the flange from top to bottom.

The lug plate is provided with a groove, and an elastic gasket is arranged in the groove.

The flange is provided with a limiting ring, the connecting ring of the corresponding PTFE liner is clamped in the limiting ring, and the inner surface of the PTFE liner is coated with a PTFE inner coating in a composite mode.

The invention relates to a steel lining tetrafluoride pipe compensator which has the following technical effects:

1) the hot-pressing connecting ring is arranged on the flanging of the tetrafluoro lining, so that the lining can be carried out on compensators with different pipe diameters, and the method is simple and convenient.

2) Through the buffer gear who constitutes such as setting up screw rod, expanding spring, can play the shock attenuation effect, improve the device's stability.

3) The connecting ring is provided with the protrusions, and the sealing rubber is added between the concave surface and the flange, so that the flange is more tightly connected with other pipe fittings.

4) Through spraying the polytetrafluoroethylene inner coating, the upper end face and the lower end face of the polytetrafluoroethylene lining, particularly the transition joint of the flanging and the connecting ring, can be more smooth, and the sealing performance is ensured.

Drawings

The invention is further illustrated by the following examples in conjunction with the accompanying drawings:

fig. 1 is a front sectional view of the present invention.

Fig. 2 is a partially enlarged schematic view of a portion a in fig. 1.

In the figure: bellows 1, flange 2, tetrafluoro inside lining 3, tetrafluoro bellows body 4, turn-ups 5, go-between 6, elastic seal circle 7, otic placode 8, screw rod 9, first bolt 10, second bolt 11, third bolt 12, expanding spring 13, recess 14, elastic washer 15, spacing ring 16, polytetrafluoroethylene undercoating 17.

Detailed Description

As shown in fig. 1-2, a steel-lined tetrafluoro-pipe compensator includes a bellows 1, a flange 2, and a tetrafluoro liner 3, where the tetrafluoro liner 3 is a tetrafluoro liner.

In order to ensure connection of general pipe fittings, flanges are arranged at two ends of each pipe fitting, the larger the diameter of each pipe fitting is, the larger the diameter of the corresponding flange is, and the longer the length between the inner diameter and the outer diameter of each flange is.

In order to ensure the corrosion resistance of the pipe fitting, two ends of the tetrafluoride pipe are required to be flanged generally, and the flanged edges are required to cover the surface of the flange. Because some pipe fittings size is great, consequently correspond the length that needs the turn-ups and also can increase, this not only brings certain degree of difficulty for the turn-ups, simultaneously, because turn-ups length overlength, and the turn-ups is formed through the extrusion behind the pipeline hot melt, consequently, the turn-ups after the secondary operation can lead to the terminal surface unevenness if length overlength, direct influence and the laminating nature of steel pipe fitting, and then influence the leakproofness and the reliability of flange and other pipe fitting flange joint.

In order to solve the problem, tetrafluoro inside lining 3 that this application adopted includes tetrafluoro bellows body 4, tetrafluoro bellows body 4 both sides carry out the turn-ups through turn-ups 5 devices, and turn-ups length control is between 5cm-10cm, cut into the go-between 6 that accords with the specification or can customize such go-between 6 through corresponding tetrafluoro plate manufacture factory with the tetrafluoro plate through cutting device, the outer diameter of go-between 6 suits with the flange outer diameter, and go-between 6 internal diameter is less than the turn-ups external diameter, go-between 6 passes tetrafluoro bellows body 4 like this and can guarantee the partial coincidence after 5 coincide with the turn-ups, the rethread press carries out the hot pressing and can guarantee that turn-ups 5 and go-between. The connecting ring 6 thus ensures coverage of the flange joint face and at the same time ensures good flatness.

In order to improve the tightness of the connection between the device and other pipe fittings, a convex surface is arranged at one end of the connecting ring 6, a concave surface is arranged at the other end of the connecting ring, a bulge is formed at the position, an elastic sealing ring 7 is arranged at the lower end of the concave surface of the bulge, and the elastic sealing ring 7 is arranged in a groove on the end surface of the flange 2. When the upper flange and the lower flange are fixedly connected with other flanges, the bulges are extruded by the end faces of the two flanges, and the bulges can fill the gap between the end faces of the two flanges, so that the end faces of the two flanges are connected in a sealing manner, leakage of corrosive liquid is reduced, and certain self-sealing performance can be realized.

In addition, the conventional steel lining tetrafluoride pipe compensator has no negative pressure resistance, and in order to improve the negative pressure resistance, at least one or more elastic steel rings can be arranged in an annular groove of the compensator, and the lining is prevented from being separated and losing efficacy due to overlarge negative pressure by utilizing the jacking of the elastic steel rings.

In addition, in order to reduce mechanical vibration generated by equipment in the using process, two sides of the upper flange 2 and the lower flange 2 are symmetrically provided with lug plates 8, the upper lug plate 8 and the lower lug plate 8 are symmetrically perforated, two ends of a screw rod 9 penetrate through the flanges 2 and are limited by a first bolt 10, a second bolt 11 and a third bolt 12 are arranged at proper positions on the middle section of the screw rod 9, and a telescopic spring 13 is sleeved on each of the screw rods 9 between the second bolt 11 and the third bolt 12 and the upper flange and the lower flange. When the compensator stretches due to temperature or vibration, the longest elongation can be limited through the first bolt 10, the shortest stretching amount can be controlled through the second bolt 11 and the third bolt 12, and certain buffering can be realized through the telescopic spring 13, so that the damping effect is achieved, and the compensator is kept stable.

In addition, the lug plate 8 is also provided with a groove 14, an elastic gasket 15 is arranged in the groove 14, and the elastic gasket 15 is made of rubber, so that the damping effect can be further improved.

In addition, the flange 2 is gone up the outward flange and is equipped with spacing ring 16, and the go-between 6 card of the tetrafluoro inside lining 3 that corresponds is in spacing ring 16, can carry out spacing location to tetrafluoro inside lining 3 like this, and one deck polytetrafluoroethylene inner coating 17 is still compound to 3 inner walls of tetrafluoro inside lining in addition, and the upper surface of polytetrafluoroethylene inner coating 17 is higher than 16 top surfaces of spacing ring or flushes with 16 top surfaces of spacing ring. Polytetrafluoroethylene undercoating 17 can further with the terminal horizontal plane flattening about the tetrafluoro inside lining 3, and then improves the leakproofness as seal structure for pipe connection's compact type is very high, also uses as the anticorrosive coating simultaneously, increase of service life.

Claims

1. A steel lining tetrafluoro pipe compensator comprises a corrugated pipe (1), a flange (2) and a tetrafluoro lining (3); the method is characterized in that: the PTFE liner (3) comprises a PTFE corrugated pipe body (4), a flanging (5) and a connecting ring (6); the flanging (5) and the connecting ring (6) are hot-pressed into a whole; one end of the connecting ring (6) is provided with a convex surface, the other end of the connecting ring is provided with a concave surface, the lower end of the concave surface is provided with an elastic sealing ring (7), and the elastic sealing ring (7) is arranged in a groove on the end surface of the flange (2).

2. The steel lined tetrafluoro pipe compensator of claim 1, wherein: flange (2) bilateral symmetry from top to bottom is equipped with otic placode (8), is equipped with screw rod (9) on otic placode (8), and flange (2) are passed and spacing through first bolt (10) in screw rod (9) both ends, is equipped with second bolt (11), third bolt (12) on screw rod (9) interlude, and the cover has expanding spring (13) on screw rod (9) between second bolt (11), third bolt (12) and the flange from top to bottom.

3. The steel lined tetrafluoro pipe compensator of claim 2, wherein: the ear plate (8) is provided with a groove (14), and an elastic gasket (15) is arranged in the groove (14).

4. The steel lined tetrafluoro pipe compensator of claim 1, wherein: the flange (2) is provided with a limiting ring (16), the connecting ring (6) of the corresponding PTFE liner (3) is clamped in the limiting ring (16), and the inner surface of the PTFE liner (3) is coated with a PTFE inner coating (17) in a composite mode.