CN206175837U - Polyethylene of raised temperature PE II hot spring insulating tubes of RT - Google Patents

Abstract

Polyethylene of raised temperature PE II hot spring insulating tubes of RT, including outer pillar layer, heat preservation, steel pipe layer, outer pillar layer and steel pipe layer combine into an overall structure's compound pipe through the heat preservation, the both ends on steel pipe layer are formed with the connector, it has the steel pipe of the connection body to concrete between the connector. The utility model discloses an outer pillar layer has good heat stability and long -term pressure resistance, and the ability of resisting external shock is much higher than other tubular product, and the material loss that prevents to cause because of construction roughly and to the destruction of system avoids the metal connecting piece among the inside and corruption heating system of later stage oxygen infiltration.

Description

II hot spring insulating tubes of heat-proof polythene PE-RT

Technical field

This utility model is related to II hot spring insulating tubes of heat-proof polythene PE-RT.

Background technology

II hot spring insulating tubes of heat-proof polythene PE-RT also known as tube-in-tube or jacket tube, as this pipe is than the guarantor of other structures The advantages of warm nature good, waterproof of energy, anti-corrosion, long service life easy construction, be the optimal thermal insulating material generally acknowledged both at home and abroad at present Material, so the industries such as heat supply, building, oil, electric power, chemical industry, cold preservation, ship, smelting, central air-conditioning are widely used in, but mesh Front insulating tube easily receives extraneous factor and damaged in installation process, and such oxygen can penetrate into steel pipe top layer, and oxygen Penetrating into can increase with the rising of temperature, can accelerate to corrode the metal connecting piece in heating system in life-time service.

The content of the invention

This utility model is directed to the deficiencies in the prior art, there is provided the heat-proof polythene PE-RT II for solving the above problems is warm Spring insulating tube.

In order to solve above-mentioned technical problem, this utility model is addressed by following technical proposals：

II hot spring insulating tubes of heat-proof polythene PE-RT, including outer protection tube layer, heat-insulation layer, steel pipe layer, the outer protection tube layer with Steel pipe layer is combined into one by heat-insulation layer the multiple tube of structure, and the two ends of the steel pipe layer are formed with connector, the company Joint steel pipe body is consolidated between interface.

The material of the outer protection tube layer is II type heat-proof polythene.

The material of the heat-insulation layer is polyurethane rigid foam plastic.

0~the 0.023W/mK of heat conductivity of the heat-insulation layer.

Beneficial effect：Compared with prior art, which has the advantages that this utility model：

II hot spring insulating tubes of this utility model heat-proof polythene PE-RT prevent tube fluid heat losses to outside inner tube, Effectively prevent the outer cold current of pipe and invade internal layer, so as to serve insulation, antifreeze function, while insulating tube main line and insulating tube pair The face of smoothly transitting that pipeline is formed can reduce the turbulent phenomenon of fluid, reduce the air pressure inside of pipeline, extend service life.

Description of the drawings

Structure charts of the Fig. 1 for II hot spring insulating tubes of heat-proof polythene PE-RT.

Cut-away views of the Fig. 2 for II hot spring insulating tubes of heat-proof polythene PE-RT.

Specific embodiment

Refering to Fig. 1,2, II hot spring insulating tubes of heat-proof polythene PE-RT, including outer protection tube layer 1, heat-insulation layer 2, steel pipe layer 3, The material of outer protection tube layer 1 is II type heat-proof polythene, and II type heat-proof polythene is by high density polyethylene (HDPE) and octene, hexene, fourth The one of which copolymerization of alkene is formed, so II type heat-proof polythene is a kind of polyene hydrocarbon system thermoplastic, density is hot with other Thermoplastic plastic such as PB, PE or PP scope is identical, but the unique molecule side chain distributed architecture of II type heat-proof polythene has which Standby remarkable cracking resistance, resistance to elevated temperatures and anti-hydrostatic strength, so outer protection tube layer 1 has good heat stability and length Performance that phase is pressure, applies in heating, hot-water heating system, and operating temperature is 70 DEG C, and under the conditions of pressure is 0.4MPa, pipeline can be safe Using more than 50 years, shock resistance was good, safe, and low-temperature embrittleness temperature is -70 DEG C, can transport at low ambient temperatures, apply Work；The ability for resisting external force collision is much higher than other tubing, and solves northern China without the need for heating in crooked pipeline The economic loss that regional winter cannot construct and cause, prevents the material caused because constructing roughly from losing and the destruction to system, The material of heat-insulation layer 2 is polyurethane rigid foam plastic, and polyurethane rigid foam plastic mostly is hole-closing structure, with insulation effect The good characteristic such as good, lightweight, specific strength is big, cohesive is strong, while also having sound insulation, shockproof, electric insulation, heat-resisting, cold-resistant, resistance to The features such as solvent, the 0~0.023W/mK of heat conductivity of heat-insulation layer 2, prevent heat losses outer to managing, also effectively prevent pipe Outer cold current invades internal layer, so as to serve insulation, antifreeze function, using the cohesive of heat-insulation layer 2, dexterously will be outer in foaming Pillar layer 1 and heat-insulation layer 2 and steel pipe layer 3 are combined into one the multiple tube of structure, and the two ends of steel pipe layer 3 are formed with connector 32, coordinate between connector 32 and joint steel pipe body 31 is installed, joint steel pipe body 31 is welded by welding technology with connector 32 It is integrated, joint steel pipe body 31 will be by strength test and leak test, first pipe after being welded as a whole with connector 32 After pressure in road rises to 1.5 times of operating pressure, in 10/interior ne-leakage to be ensured of voltage stabilizing, then the pressure drop in pipe During to operating pressure, weld seam is carried out beaing inspection one by one around weld seam with the hand hammer of 1kg, in 30 minutes ne-leakages and pressure Drop is as qualified less than 0.2 atmospheric pressure, will finally ensure the defects such as annular space, cracking, delamination occur, make connection Steel tube body 31 reaches tightness and water proofing property with the entirety of connector 32.

II hot spring insulating tubes of heat-proof polythene PE-RT in design and construction it is noted that it is following some, one, designing and applying In work, must get a real idea of heat supply pipeline directly buried installation mode and be divided into has compensation directly buried installation and two kinds of collector-free flotation Mode, really grasps the respective operation principle of two ways, feature and its application scenario, so as to reasonable selection in design, applies It is safe and reliable in work, economical.1st, there is compensation directly buried installation mode, be by pipeline natural compensation and compensator（Such as square and ripple Stricture of vagina pipe compensator）To solve pipeline thermal expansion length, so that thermal stress is minimum；Collector-free flotation, briefly It is that pipeline does not have any indemnifying measure, but tube material intensity itself to absorb thermal stress when being heated；2nd, the uncompensated side of laying Formula, in pipe laying, is heated to uniform temperature to pipeline first, then fixes pipeline welding, when pipeline returns to installation During temperature（Temperature is reduced）, pipeline bears certain tension in advance.When the logical thermal technology of pipeline makees, with the rising of temperature, Pipe stress is zero, and when continuing to heat up, the compressive stress of pipeline increases, when temperature is raised to operating temperature, the compressive stress of pipeline （Thermal stress）Still less than allowable stress.So, pipeline can without compensation device normal work.This uncompensated mode should With fourth strength theory, apply man-hour requirement and pipeline is preheated, construct cumbersome, but existing a large amount of engineering practices both at home and abroad, reason It is reliable by calculating, can ensure that safety.Or apply the 3rd strength theory, this mode to give full play to steel plasticity potentiality, construction party Just, without the need for preheating, when it is determined that using have compensation directly buried installation mode when, the depth of burying only consider due to ground load effect not Can destroy pipeline it is stable just can, from from the aspect of economy, easy construction etc..When using there is compensation directly buried installation mode, to the greatest extent Amount shallow embedding, general thickness of earth covering are more than 0.6 meter, and unrelated with pipe diameter size, when using collector-free flotation mode, The depth of burying to be considered the stability requirement of pipeline, and stability is mainly relevant with thickness of earth covering, and general ratio has compensation to bury deep, when adopting During with the collector-free flotation pipeline not preheated, thickness of earth covering should be directly proportional to pipe diameter size, and two, in direct-buried pipe construction In, welding is the key job of a guarantee construction quality, when connected with welding steel tube body 31 is with connector 32, should carry out work Cheat, and it should be noted that beat groove.

Embodiment described above is only that preferred implementation of the present utility model is described, not to this practicality New spirit and scope are defined.On the premise of without departing from this utility model design concept, this area ordinary person couple Various modifications and improvement that the technical solution of the utility model is made, all should drop into protection domain of the present utility model, this reality With the new technology contents being claimed, all record in detail in the claims.

Claims (4)

1. II hot spring insulating tubes of heat-proof polythene PE-RT, including outer protection tube layer（1）, heat-insulation layer（2）, steel pipe layer（3）, its feature It is, the outer protection tube layer（1）With steel pipe layer（3）By heat-insulation layer（2）The multiple tube of the structure that is combined into one, the steel pipe Layer（3）Two ends be formed with connector（32）, the connector（32）Between be consolidated with joint steel pipe body（31）.

2. II hot spring insulating tubes of heat-proof polythene PE-RT according to claim 1, it is characterised in that the outer protection tube layer （1）Material be II type heat-proof polythene.

3. II hot spring insulating tubes of heat-proof polythene PE-RT according to claim 1, it is characterised in that the heat-insulation layer（2） Material be polyurethane rigid foam plastic.

4. II hot spring insulating tubes of heat-proof polythene PE-RT according to claim 1, it is characterised in that the heat-insulation layer（2） 0~0.023W/mK of heat conductivity.