CN102278544A - Prefabricated direct burial composite insulating pipes of plastic working pipes - Google Patents
Prefabricated direct burial composite insulating pipes of plastic working pipes Download PDFInfo
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- CN102278544A CN102278544A CN2011102203717A CN201110220371A CN102278544A CN 102278544 A CN102278544 A CN 102278544A CN 2011102203717 A CN2011102203717 A CN 2011102203717A CN 201110220371 A CN201110220371 A CN 201110220371A CN 102278544 A CN102278544 A CN 102278544A
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Abstract
The invention provides prefabricated direct burial composite insulating pipes of plastic working pipes, which are characterized in that working pipes are made of thermoplastic plastics with good thermal insulation, corrosion resistance, thermal stability and weldability, such as PPS (polyphenylene sulfite), PPO (poly-p-phenylene oxide), PSF (polysulfone), PBT (polybutylece terephthalate) and other resins, outer protection pipes are made of polyethylene with good corrosion resistance and strong scarping resistance, and heat-insulating materials with a coefficient of thermal conductivity being 0.02w/m.k-0.04w/m.k only are filled between the working pipes and the outer protection pipes. The composite insulating pipes overcome the defects that prefabricated direct burial insulating pipes of steel working pipes are scaled, blocked and corroded easily, and have the short service life. The prefabricated direct burial composite insulating pipes of the plastic working pipes can transmit hot water below 140 DEG C, low-pressure steam and the like, can be applied to secondary heat supply pipe networks, direct-supply geothermal water systems, domestic hot water systems and the like directly, prolong the service life of the systems and improve the heat preservation effects of the systems.
Description
Technical field
The present invention relates to a kind of prefabricated direct-buried compound thermal insulating pipe, the prefabricated direct-buried compound thermal insulating pipe of particularly a kind of plastics working pipe.
Background technique
The working pipe of traditional prefabricated direct-buried compound thermal insulating pipe is steel, and is higher in the fed sheet of a media temperature, when pressure is big, has certain advantage.But steel working pipe corrosion-resistant, safety in operation is poor, and pipeline is short working life, especially institute's chloride ion-containing is understood heavy corrosion steel working pipe in the direct-furnish geothermal water, after operation a period of time, and the tube wall corrosion, produce a large amount of rust deposite blocking pipes, even make the wall erosion perforation, and cause leakage, influence the working life of normal operation of pipe network and pipeline, and cause in the water content of beary metal too high, the inner tube wall breed bacteria is not only polluted sanitary equipment, also the health of serious harm human body.Mostly the corrosion resistance of plastics is all fine, as fluoroplastic can resist chloroazotic acid erosion and thereby plastics king's good reputation, the history in HDPE pipeline existing 55 years of working life in water supply system, these all are that common metal is not accomplished.The thermal conductivity of plastics is about 1/40th of a steel generally at 0.15w/m.k～0.45w/m.k.The corrosion resistance of plastics and adiabaticity surpass the several times of iron and steel and even tens of times.But the heat resistance of common plastics tube is poor, and its continuous operation temperature generally is no more than 40 ℃, is difficult to enter the application of thermal insulation pipe.Even heat resistance is plastic tube preferably,, also only can satisfy the use of the water system below 70 ℃ as PVC-C pipe, PEX pipe, PP-R etc.But also do not satisfy the usage requirement under the higher temperature operating mode, as be higher than the conveying of 70 ℃ of hot water, perhaps be used for the conveying of low pressure steam etc.Plastic tube under 100 ℃ of serviceability temperatures or the above higher temperature came out already, made to replace the steel working pipe with the plastics working pipe and be used for the conveying that low pressure steam and temperature be higher than 70 ℃ of hot water and become possibility.If adopt these heat resistances, the corrosion resistance excellent plastics of holding concurrently to make the prefabricated direct-buried compound thermal insulating pipe of plastics working pipe, can more help the thermal insulation property of pipeline, can further reduce the heat loss in the heating agent course of conveying.
Summary of the invention
For overcoming the easy fouling of working pipe, the blocking pipe of the prefabricated direct-buried compound thermal insulating pipe of steel working pipe, lack perishable, working life, overcomes drawbacks such as heat resistance deficiency such as PVC-C pipe, PEX pipe, PP-R pipe, PB-1 pipe.Adopt thermal insulation, corrosion resistance, heat resistance, the weldability excellent thermoplastic pipes pipe of working of holding concurrently in the present invention; Employing good corrosion resistance, the plastic tube that anti-scratch ability is strong are done outer pillar; Fill the low thermoinsulation material of thermal conductivity between working pipe and the outer pillar.The prefabricated direct-buried compound thermal insulating pipe of plastics working pipe, its overall thermal conductivity further reduces than the thermal conductivity of plastics working pipe.Make when working pipe adopts PPS, PPO, high-temperature resistance plastices such as PSF, PBT, then can be used for low pressure steam and high-temperature water conveyance conduit below 140 ℃.Thermoinsulation material also can be selected according to the fed sheet of a media operating mode, can be used in 80 ℃ and the following operating mode system as polystyrene foam plastics, it is medium that urethane foam can be used in 150 ℃ and the following operating mode system, polypropylene foam can be used in 130 ℃ and the following operating mode system, glass wool, rock wool etc. can be used for 150 ℃ and above operating mode system.
Embodiment
The material of working pipe with adopt good heat resistance, good corrosion resistance, creep resisting ability is strong, weldability is good thermoplastic resin, as adopting PPS (polyphenylene sulfide), PPO (PPO), PBT (polybutylene-terephthalate), PSF (polysulfones) etc. and their alloy or modified product.The common feature of the plastic tube that these resins are made is: good corrosion resistance, creep resisting ability is strong, heat resistance is better, weldability is outstanding, thermal conductivity is little.They are acidproof, alkaline-resisting etc. is better than most metal pipes; The plastic tube that PPS, PPO, PBT, PSF etc. and their alloy or modified product are made, its operating temperature can be up to 140 ℃.
The material of outer pillar is advisable with HDPE, is embedded with the radiation plastic stent between working pipe and the outer pillar, to guarantee concentricity and critical external compressive resistance ability between the two.The plastic materials of support also should be determined according to the operating temperature of the made prefabricated direct-buried compound thermal insulating pipe of plastics working pipe.
The thermoinsulation material thermal conductivity of filling between working pipe and the outer pillar should be little, water absorption rate is low, heat resistance will be got well, and the polypropylene foam water absorption rate is lower than 3 ‰, applicable to the thermal insulation of the prefabricated direct-buried composite thermal pipeline of the plastics working pipe system below 130 ℃; The thermoinsulation material of the prefabricated direct-buried compound thermal insulating pipe of plastics working pipe more than 130 ℃ can be rock wool, glass wool etc.
The manufacture process of the prefabricated direct-buried compound thermal insulating pipe of plastics working pipe of the present invention is fairly simple.
The prefabricated direct-buried compound thermal insulating pipe of plastics working pipe of the present invention, working pipe and outer pillar material are thermoplastic, and weldability is outstanding, connects reliable; The heat insulation layer material can exempt to add plastic stent when adopting the polypropylene foam pipe; If when adopting thermal insulating material such as rock wool, then rock wool can be prefabricated into pipeline section, press the rule of support, rock wool pipeline section, support, rock wool pipeline section, support, make intactly heat insulation layer of one of plastics working pipe outer wall coating, it is pushed in the outer pillar get final product then.
The prefabricated direct-buried compound thermal insulating pipe of plastics working pipe of the present invention, prefabricated direct-buried compound thermal insulating pipe when the working pipe that adopts PPS, PPO, PBT, PSF etc. and their alloy or modified product to make, can be widely used in secondary heating network, direct-furnish geothermal water, life with in the systems such as hot water, its operating temperature can reach 140 ℃, can be used in the steam vapour system.
Claims (3)
1. prefabricated direct-buried compound thermal insulating pipe of plastics working pipe, it is characterized in that, it is with heat resistance, the outstanding thermoplastic of the corrosion resistance pipe of working, and adopts polyethylene to do outer pillar, and the low insulating material of filling thermal conductivity is made between plastics working pipe and the outer pillar.
2. according to the prefabricated direct-buried compound thermal insulating pipe of the described plastics working pipe of claim 1, described plastics working pipe is to make with heat resistance, the outstanding thermoplastic of corrosion resistance, it is characterized in that, adopts PPS, PPO, resins such as PSF, PBT to make.
3. according to the prefabricated direct-buried compound thermal insulating pipe of the described plastics working pipe of claim 1, fill the low insulating material of thermal conductivity between described working pipe and the outer pillar and make, it is characterized in that polypropylene foam and rock wool etc. is made.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102203717A CN102278544A (en) | 2011-08-03 | 2011-08-03 | Prefabricated direct burial composite insulating pipes of plastic working pipes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102203717A CN102278544A (en) | 2011-08-03 | 2011-08-03 | Prefabricated direct burial composite insulating pipes of plastic working pipes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102278544A true CN102278544A (en) | 2011-12-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011102203717A Pending CN102278544A (en) | 2011-08-03 | 2011-08-03 | Prefabricated direct burial composite insulating pipes of plastic working pipes |
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| CN (1) | CN102278544A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102748558A (en) * | 2012-07-16 | 2012-10-24 | 苏州宏久航空防热材料科技有限公司 | Arced vacuum heat insulation composite plate and manufacturing method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3390704A (en) * | 1964-11-19 | 1968-07-02 | Du Pont | Polyolefin fluid conduit laminates |
| CN2625692Y (en) * | 2003-05-23 | 2004-07-14 | 辽河石油勘探局油田建设工程二公司 | Glass fibre reinforced plastic foam jacket composite antiseptic heat preservation pipe |
| CN2793507Y (en) * | 2005-05-27 | 2006-07-05 | 李世昌 | Thermal-insulative pipe with extruded polystyrene foam plastic |
| CN200989488Y (en) * | 2006-10-20 | 2007-12-12 | 辽河石油勘探局 | Continuous length plastic thermal insulation pipe |
-
2011
- 2011-08-03 CN CN2011102203717A patent/CN102278544A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3390704A (en) * | 1964-11-19 | 1968-07-02 | Du Pont | Polyolefin fluid conduit laminates |
| CN2625692Y (en) * | 2003-05-23 | 2004-07-14 | 辽河石油勘探局油田建设工程二公司 | Glass fibre reinforced plastic foam jacket composite antiseptic heat preservation pipe |
| CN2793507Y (en) * | 2005-05-27 | 2006-07-05 | 李世昌 | Thermal-insulative pipe with extruded polystyrene foam plastic |
| CN200989488Y (en) * | 2006-10-20 | 2007-12-12 | 辽河石油勘探局 | Continuous length plastic thermal insulation pipe |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102748558A (en) * | 2012-07-16 | 2012-10-24 | 苏州宏久航空防热材料科技有限公司 | Arced vacuum heat insulation composite plate and manufacturing method thereof |
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Application publication date: 20111214 |