CN2251088Y - Steel tube liner polypropylene composite acid tube - Google Patents

Abstract

The utility model relates to a steel tube liner polypropylene composite type acid tube. The utility model is characterized in that a polypropylene plastic tube 4 is sheathed with a steel tube 3 which is provided with a flange hole joint, the clearance between the outer diameter of the polypropylene plastic tube and the inner diameter of the steel tube is delta, a sealing ring 2 is arranged on a joint of the polypropylene tube 4 when each section composite tube is connected and arranged, the flange joint of the steel tube thereof is connected with a bolt 1, and the joint of the polypropylene tube 4 which is provided with the sealing ring 2 is clamped tightly. The utility model has the advantages of simple structure, convenient manufacture, low cost and less loss of expansion joints and acid feeding tubes, and can be used for acid liquid conveying tubes.

Description

The compound acid tube of inner lining of steel pipe polypropylene

The utility model belongs to salt pickling unit acid solution conveyance conduit field, is particularly useful for high temperature and carries the hydrochloric acid solution pipeline.

The conveyance conduit of existing hydrochloric acid shallow slot pickling unit, its pipe material is generally polypropylene plastics, because this pipeline operating temperature is up to 90 ℃, so the polypropylene expansion coefficient is big, be out of shape also greatlyyer, causes its pipe expansion to save and the well damage of conveyance conduit.Make the interior spent acid pipeline of graphite heater outlet conduit and trench often produce Lou sour problem, need often to change pipeline and expansion joint, so not only increased the consumption of pipeline and expansion joint, simultaneously again heavy corrosion the structure of set structure and underground sour ditch, environment is polluted.Though multiple composite polypropylene board occurs at present, be made into the complex process of conveyance conduit, and the cost height.

The purpose of this utility model provides a kind of expansion joint and damages very little, the confession compound acid tube of inner lining of steel pipe polypropylene that the acid tube road life-span is long, cost is low.

The utility model is achieved in that it is made up of steel pipe and pp pipeline, and its main points are steel pipes 3 that suit has flanged joint on pp pipeline 4, the gap formula of the external diameter of its pp pipeline and the internal diameter of steel pipe $\mathrm{\δ}=\sqrt{{\left(\frac{L+\mathrm{\ΔL}}{2f}\right)}^2-{\left(\frac{L}{2f}\right)}^2}$ Calculate, L in the formula---steel pipe, polypropylene tube primary standard length,

Δ L=Δ L ₁-Δ L ₂---expansion length is poor,

Δ L ₁---polypropylene tube length expansion amount,

Δ L ₂---steel pipe length expansion amount,

F---wave number.When every section multiple tube is installed, a seal ring (2) is installed on the joint of polypropylene tube (4), its steel pipe flange joint is tightened with bolt (1), and will have the joint clamping of the polypropylene tube (4) of seal ring (2).

The utility model has the advantages that,, make it difference and eliminate in steel pipe, the swell increment of whole polypropylene pipeline is controlled in the steel pipe scope of design, guaranteed that expansion joint and pipeline are not damaged because employing steel pipe 3 is controlled polypropylene tube and steel pipe expansion elongation is poor.

The utility model is described in further detail below in conjunction with accompanying drawing.

Fig. 1 is a sectional view of the present utility model.

Fig. 2 is the schematic representation that produces corrugated polypropylene tube after suit is heated in the utility model steel pipe.

Main points of the present utility model are, on original pp pipeline 4, be set with the steel pipe 3 of flanged joint, consider that the polypropylene tube back that is heated produces corrugated in steel pipe, the expansion elongation of controlling polypropylene tube and steel pipe with steel pipe is poor, for differential expansion can be digested in steel pipe length, guarantee that expansion joint and pipeline do not damage, the utility model is when mounted, the gap of having designed the internal diameter of the external diameter of pp pipeline and steel pipe is δ, uses formula $\mathrm{\δ}=\sqrt{{\left(\frac{L+\mathrm{\ΔL}}{2f}\right)}^2-{\left(\frac{L}{2f}\right)}^2}$ Calculate, L in the formula---steel pipe, polypropylene tube primary standard length,

Δ L=Δ L ₁-Δ L ₂---expansion length is poor,

Δ L ₁---polypropylene tube length expansion amount,

Δ L ₂---steel pipe length expansion amount,

F---wave number.

The utility model design standard pipe is 1 meter, and producing corrugated in steel pipe after polypropylene tube is heated is 5～10 ripples, and the design gets 7 waveforms.

The polypropylene expansion coefficient is 1.49 * 10 ^-4I/ ℃

The expansion coefficient 11.7 * 10 of steel ^-6I/ ℃

Every mark rice swell increment:

ΔL ₁＝1.49×70×1000＝10.43mm

ΔL ₂＝11.7×10 ^-670×1000＝0.82mm

ΔL＝10.43-0.82＝9.61mm

f＝7 L＝1000mm $\mathrm{\δ}=\sqrt{{\left(\frac{1000+9.61}{2\×7}\right)}^2-{\left(\frac{1000}{2\×7}\right)}^2}=9.92\mathrm{mm}$

Be pipe range when being 1 meter, after polypropylene tube (4) was heated, the waveform that produces in steel pipe 3 was 7, and the optimum value of its assemblage gap δ can be 9.92mm.Average each ripple digestion expansion elongation is 1.41mm.Certain also desirable single ripple of its waveform, double wave or many ripples.The gap of waveform number also can be calculated according to following formula after other steel pipe length and polypropylene were heated.Steel pipe 3 can be installed after determining with the gap delta of polypropylene tube 4, and every section composite pipe connects, during installation, in the joint of polypropylene tube one seal ring 2 is installed, its steel pipe is tightened with bolt 1 by the flange of correspondence, and will have the joint clamping of the polypropylene tube 4 of seal ring 2.Can guarantee that so promptly its gap is even, whole pipeline swell increment is controlled in the steel pipe scope of design, expansion joint and very few for the loss of acid tube road, even under 90 ℃ of high temperature, carry also no problem, pipeline greatly improves working life, has stopped to leak the generation that sour phenomenon is run in acid basically.The utility model is simple in structure, easily manufactured, cost is low, using effect is good, can be widely used in salt pickling unit acid solution conveyance conduit.

Claims (2)

1, the compound acid tube of a kind of inner lining of steel pipe polypropylene is made up of steel pipe and pp pipeline, it is characterized in that

A. go up the steel pipe (3) that suit has flanged joint at pp pipeline (4), its polypropylene plastics external diameter of pipe and pipe diameter the gap by formula $\mathrm{\δ}=\sqrt{{\left(\frac{L+\mathrm{\ΔL}}{2f}\right)}^2-{\left(\frac{L}{2f}\right)}^2}$ Calculate, L in the formula---steel pipe, polypropylene tube primary standard length,

Δ L=Δ L ₁-Δ L ₂---expansion length is poor,

Δ L ₁---polypropylene tube length expansion amount,

Δ L ₂---steel pipe length expansion amount,

F---wave number.

B. during every section compound acid tube connection, a seal ring (2) is installed in the joint of polypropylene tube, the flanged joint on its steel pipe is tightened with bolt (1), and the joint that will have a polypropylene tube (4) of seal ring (2) clamps.

2, the compound acid tube of a kind of inner lining of steel pipe polypropylene is characterized in that when pipe range is 1000mm, and the ripple that produces in steel pipe (3) after polypropylene tube (4) is heated is 7, and at this moment the optimum value of δ can be $\mathrm{\δ}=\sqrt{{\left(\frac{L+\mathrm{\ΔL}}{2f}\right)}^2-{\left(\frac{L}{2f}\right)}^2}=9.92\mathrm{mm}$ 。

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