Method of manufacturing heat-insulated pipe

FIELD: manufacturing heat-insulated pipes.

SUBSTANCE: method comprises manufacturing pipe that is composed of one or several inner pipes, outer pipe that is mounted concentrically and with a spaced relation to the inner pipe, and insulation that is mounted within the space between the inner and outer pipes and is made on the basis of polyurethane or polyisocyanurate foams.

EFFECT: reduced cost and improved heat insulation.

5 cl, 2 dwg

 

The invention relates to a method of manufacturing a thermally insulated pipe according to the restrictive part of claim 1 of the formula.

From DE 19629678 A1 is known a method of manufacturing a thermally insulated pipe, wherein at least one inner tube wrapped molded in the sleeve of a polymer film with the formation of cavities in the form of an annular gap and into the cavity serves expanded onto a polymer composition on the basis of polyurethane, which completely fills the cavity with the formation of insulating foam. The polymer film ekstragiruyut outer pipe of thermoplastic as a mechanical protective layer. This known method mix together the components of the polyurethane - polyol and isocyanate is served to the gun nozzle, which injects into the cavity, mix together the components. Components polyol and isocyanate put in containers, of which the polyol and isocyanate are served separately from each other in the mixing device, is mixed therein and the mixture is sent on to the gun nozzle.

To improve the insulating action of polyurethane foam located in the pores of the foam, the air was already replaced halogenated hydrocarbons due to the fact that in the mixture before foaming was added halogenated hydrocarbons. These halogenated hydrocarbons, such as known under the trade the Oh mark frigin, from an environmental point of view, however, is doubtful, as they presumably destroy the ozone layer.

In search of substitutes engineers met not halogenated hydrocarbons, such as U-pentane, cyclopentane and others that lead to pins with the same properties.

From DE 19708570 a method of obtaining foams that can be used as a material for the insulation of the pipelines. The foam is produced by conversion of polyisocyanates, reactive compared with isocyanates compounds with a molecular mass of 500-8000 g/mol, in the presence of pore and catalysts, which used a pore-containing hydrocarbons with C3- or4-rings having a boiling point 0-75°at a pressure of 1013 mbar. Obtaining foams described in laboratory scale and not industrial.

The basis of the present invention lies in the task of improving the above-described method of manufacturing heat-insulated pipes so that, proceeding from the known prior art, it was possible to achieve a cost-effective, and that it was possible to produce a layer of insulation to pipe with improved insulating properties. Shorter task is to measure the pore-forming and the air in the most exact way in small Qty is the operation.

To solve this problem is proposed a method of manufacturing a thermally insulated pipe, consisting of one or more inner tubes, concentric located at a distance from the inner pipe outer pipe and filling the annular gap between the inner and outer pipes of the heat insulation layer based on polyurethane or polyisocyanurate foam, in which the inner tube is continuously wrap the outer tube and in the annular gap injected expanded onto plastic, with a polyol, a blowing agent based on pentane and air fed into the static mixer and mixed therein, and then this mixture is mixed with the isocyanate in a dynamic mixer.

The blowing agent is a pentane. With liquid pentane is served by pneumonias on the safety line from the tank to tranportavimu membrane pump and through trekhosmievogo membrane pump served in the static mixer on the sleeve. The mixture of the polyol component, pentane and air, and isocyanate component are served by means of gear pumps in a dynamic mixer.

In addition to directly derived from the problem statement of benefits due to the measures according to the invention achieves the following advantages:

- dosing of shares can be changed at any time;

component polyamory to be replaced any time;

investment costs are lower than in traditional ways;

- explosive area less than the traditional method.

1 shows a side view of an apparatus for manufacturing heat-insulated pipes. Figure 2 - scheme of the preparation of the foam.

With drum 1 is continuously unwind the inner tube 2. The inner tube 2 is predominantly cross-linked polyethylene pipe, the wall of which is embedded a layer of polyvinyl alcohol. The inner tube 2 is passed through a pair of 3-driven calibration of the rollers. The calibration roller pair 3 mounted for movement in two perpendicular directions across the direction of manufacture.

From the reel 4 roll out the film 5 from LLDPE (linear low-density polyethylene) and molded around the inner pipe 2 concentric her split pipe 6 with glued or welded longitudinal seam. In still an open split pipe 6 is injected expanded onto a polymer blend of a polyurethane or polyethylene basis. In the case of polyurethane used gun 7, which mix together components is sprayed on the film 5.

In the split pipe 6 can be introduced, if necessary, the signal conductors 8.

Closed pipe is injected into the mold 9, consisting of a set of semi-molds 9a and 9b, which form together the "running form" for the inner tube 2, sleep is defined by the insulation layer and the film 5.

Facing the film 5 to the surface of the half-form 9a, 9b have a wavy profile, in which the film 5 is pressed due to the pressure of foaming. Coming from a form 9 pipe 10 has a corrugated surface.

The pipe 10 then passes through the x-ray device 11, through which the pipe 10 is continuously checked for accurate centric position of the inner tube 2. In case of deviation of the calibration roller pair 3, respectively displace. On the pipe 10 and then through the extruder 12 ekstragiruyut outer shell 13 made of plastic, which, under the action of reduced pressure is pressed into corrugated pipe 10. The outer shell is glued with a polymer film 5 on the basis of their high due to the extrusion temperature.

The finished tube 14 can then be pulled with a tractor of the crawler device 15 and a suitable device is molded in an annular Bay.

Alternatively, the pipe 14 is wound on a drum (not shown).

Getting the foam is explained in more detail in figure 2.

Components pentane, for example, a cyclopentane, a polyol and the air is metered served in the static mixer 18. Pentane is served in a static mixer 18 from the reservoir 16 through trekhosmievogo membrane pump 17. Trehosnovnoy diaphragm pump 17 delivers performance from 0.003 to 4.4 g/s with an accuracy of 0%. To check use the flow meter 19. The polyol is supplied from the tank 20 through the gear pump 21, and the number of the polyol regulate the flow meter 22.

The air supplied by the compressor to thermal flow meter 23, which dispenses the air in quantities of from 0.5 to 20 nl/h

Pre-mixed in the static mixer 18 components served in located directly behind the dynamic mixer 24. Due to the immediate neighbourhood 18 static and dynamic 24 faucets to prevent separation of the components.

Component isocyanate served in the dynamic mixer 24 from the tank 25 by pump 26 and the flow meter 27 and there processed with a pre-mixed polyol components, pentane and air in the high-quality and very homogeneous foam, which continuously with the help of spray guns 7 served in the annular gap between the inner pipe 2 and the film 5 or the outer tube 13.

1. Method of making insulated pipe comprising one or more inner tubes (2)concentric located at a distance from the inner pipe (2) outer tube (13) and to fill the annular gap between the inner (2) and outer (13) pipe heat insulation layer based on polyurethane or polyisocyanurate foam, in which the inner tube (2) is continuously wrapped externally the second pipe (13) and the annular gap injected expanded onto plastic, characterized in that the polyol, the blowing agent on the basis of pentane and air fed into the static mixer (18), and mix in it, and this mixture is mixed with the isocyanate in a dynamic mixer (24).

2. The method according to claim 1, characterized in that the blowing agent is a pentane.

3. The method according to claim 1 or 2, characterized in that the liquid pentane is served by pneumonias on the safety line from the tank (16) to tranportavimu membrane pump (17) and through trekhosmievogo membrane pump (17) is served in a static mixer (18).

4. The method according to claim 3, wherein the pentane is served in a static mixer (18) through trekhosmievogo membrane pump (17) on the sleeve.

5. The method according to one of claims 1, 2, 4 characterized in that the mixture of the polyol component, pentane and air, and isocyanate component are served by means of gear pumps in a dynamic mixer (24).

6. The method according to claim 3, characterized in that the mixture of the polyol component, pentane and air, and isocyanate component are served by means of gear pumps in a dynamic mixer (24).



 

Same patents:

FIELD: polymeric pipe production, particularly to manufacture polymeric pies reinforced with metal or other frames.

SUBSTANCE: method for pipe production by extrusion molding operation involves performing pipe welding by several roller electrode pairs simultaneously, wherein number of electrode pairs is equal to number of spiral pairs. Welding current is supplied independently to each electrode pair. Number of electrode pairs is equal to n/2, where n is number of reinforcing spirals. Central angle α of each pair defined between electrodes and transversal reinforcing spirals in points of electrode contact therewith is equal to 120-240°. Welding current is alternately supplied to each electrode pair through current-supply commutators. Device for continuous pipe production additionally has reels, roller electrodes and current-supply commutators. Number of reel pairs is equal to number of reinforcing spiral pairs, electrode pairs and current-supply commutator pairs. Device also has extruded pipe delivery mechanism. Number of electrode pairs is equal to n/2, where n is number of reinforcing spirals. Central angle α of each pair defined between electrodes and transversal reinforcing spirals in points of electrode contact therewith is equal to 120-240°. Each roller electrode is carried by lever having eccentric rotary support. Levers of each pair from one side of eccentric rotary supports have counterweights. Other sides thereof are connected with each other by means of pneumatic cylinders with welding force indication and control means. Roller welding electrodes of each pair are serially connected with each other, with mandrel and current source.

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2 cl, 5 dwg

FIELD: chemical industry; other industries; production of the pipes made out of the foamed plastic used for heat-insulation of the pipelines.

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EFFECT: the invention ensures, that the pipe manufactured out of the foamed plastic with such additional layer of the fibers has the higher heat-resistance, the lower thermal conductivity in comparison with ordinary insulation pipes made out of the foam plastic.

4 cl, 3 dwg

FIELD: laminate polymeric tubes made by centrifugal method.

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7 cl

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EFFECT: the invention ensures the temperature measurement and regulation accuracy of the combined glass-fiber pipes in the chamber of their polymerization.

3 cl, 2 dwg

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EFFECT: the invention ensures simplification and reduction of the cost of the multi-chamber pipe manufacture.

3 cl, 2 dwg

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7 cl, 2 dwg

FIELD: chemical industry; methods and devices for manufacture of the multilayer pipes.

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3 cl, 1 dwg

FIELD: chemical industry; methods and the devices for manufacture of the thermoplastic pipe with double walls and the coupling box.

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EFFECT: the invention ensures the accurate molding of the coupling box by the simple means.

16 cl, 8 dwg

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6 cl, 6 dwg

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1 dwg

FIELD: process for manufacture of flat fiber-reinforced composite article which may be used as construction or packaging material.

SUBSTANCE: method involves placing fibers on lower substrate; applying liquid foam hardening binding agent onto fibers so as to completely coat fibers with binding agent; feeding fibers coated with binding agent and positioned between upper and lower substrates into space between upper and lower pressing plates continuously movable on upper side relative to lower side of fibers with binding agent, with fibers coated with binding agent moving at the velocity of pressing plates allowing binding agent to be foamed, expanded and hardened between upper and lower pressing plates; removing substrates from hardened article. Method further involves manufacturing cohesion fibrous mat from fibers. Before applying of binding agent onto mat, thickness of fibers makes from about 0.5 mm to about 0.8 mm, width - from 0.3 mm to 2 mm, and length of at least 80% of fibers makes at least 100 mm, moisture content of fibrous mat before application of binding agent is at least 5%. Method further involves applying binding agent onto mat so as to form mixture of binding agent and fibrous mat. Mixture contains fibers close to upper surface of mat, said surface facing upper pressing plates, and to lower surface of mat facing lower pressing plates. Mixture of mat fibers and binding agent is moved by means of upper and lower substrates between which said mixture is positioned. Before removal of substrates, mixture is exposed to pressure of from at least 0.8 bar but not in the excess of 5 bar to result in hardening of flat article having thickness of from about 10 mm to about 150 mm. Also described are apparatus for manufacture of flat fiber-reinforced composite article and flat fiber-reinforced composite rigid article.

EFFECT: minimized manufacture costs and improved quality of article having stable shape.

19 cl, 6 dwg

FIELD: electrical communication components; cables whose conductors are covered with polymeric insulation extruded about conductor.

SUBSTANCE: proposed cable has its conductors covered with insulation that has at least one component incorporating maximum 20, and best of all 15, mass percent of polymer characterized in high degree of extrudate swelling. This polymer is defined as that characterized in extrudate swelling degree over 55% and higher, best of all that having extrudate swelling degree over 65%. Best insulation has at least second component of high degree of cracking resistance under stress; therefore, minimal combination of these polymers will provide for insulation layer possessing unique combination of physical properties, including high degree of foaming, fine uniform cellular structure, reduced attenuation, and cracking resistance under stress which is capable of sustaining temperature of 100 °C over 100 h without cracking in spirally coiled state at stress level one-fold higher than outer diameter of insulation.

EFFECT: improved electrical characteristics and mechanical strength of insulation.

23 cl, 6 dwg, 3 tbl

FIELD: electrical communication components; cables whose conductors are covered with polymeric insulation extruded about conductor.

SUBSTANCE: proposed cable has its conductors covered with insulation that has at least one component incorporating maximum 20, and best of all 15, mass percent of polymer characterized in high degree of extrudate swelling. This polymer is defined as that characterized in extrudate swelling degree over 55% and higher, best of all that having extrudate swelling degree over 65%. Best insulation has at least second component of high degree of cracking resistance under stress; therefore, minimal combination of these polymers will provide for insulation layer possessing unique combination of physical properties, including high degree of foaming, fine uniform cellular structure, reduced attenuation, and cracking resistance under stress which is capable of sustaining temperature of 100 °C over 100 h without cracking in spirally coiled state at stress level one-fold higher than outer diameter of insulation.

EFFECT: improved electrical characteristics and mechanical strength of insulation.

23 cl, 6 dwg, 3 tbl

FIELD: process for manufacture of flat fiber-reinforced composite article which may be used as construction or packaging material.

SUBSTANCE: method involves placing fibers on lower substrate; applying liquid foam hardening binding agent onto fibers so as to completely coat fibers with binding agent; feeding fibers coated with binding agent and positioned between upper and lower substrates into space between upper and lower pressing plates continuously movable on upper side relative to lower side of fibers with binding agent, with fibers coated with binding agent moving at the velocity of pressing plates allowing binding agent to be foamed, expanded and hardened between upper and lower pressing plates; removing substrates from hardened article. Method further involves manufacturing cohesion fibrous mat from fibers. Before applying of binding agent onto mat, thickness of fibers makes from about 0.5 mm to about 0.8 mm, width - from 0.3 mm to 2 mm, and length of at least 80% of fibers makes at least 100 mm, moisture content of fibrous mat before application of binding agent is at least 5%. Method further involves applying binding agent onto mat so as to form mixture of binding agent and fibrous mat. Mixture contains fibers close to upper surface of mat, said surface facing upper pressing plates, and to lower surface of mat facing lower pressing plates. Mixture of mat fibers and binding agent is moved by means of upper and lower substrates between which said mixture is positioned. Before removal of substrates, mixture is exposed to pressure of from at least 0.8 bar but not in the excess of 5 bar to result in hardening of flat article having thickness of from about 10 mm to about 150 mm. Also described are apparatus for manufacture of flat fiber-reinforced composite article and flat fiber-reinforced composite rigid article.

EFFECT: minimized manufacture costs and improved quality of article having stable shape.

19 cl, 6 dwg

FIELD: manufacturing heat-insulated pipes.

SUBSTANCE: method comprises manufacturing pipe that is composed of one or several inner pipes, outer pipe that is mounted concentrically and with a spaced relation to the inner pipe, and insulation that is mounted within the space between the inner and outer pipes and is made on the basis of polyurethane or polyisocyanurate foams.

EFFECT: reduced cost and improved heat insulation.

5 cl, 2 dwg

FIELD: chemistry.

SUBSTANCE: foamed material consists of a single-component, moisture-curable composition containing at least one polymer P, having isocyanate groups and/or alkoxy silane groups, 10-60 vol. % of at least one gas and 10-30 wt % soot per total weight of the single-component foamed material which is curable in a moist medium. Application of the obtained foamed material is carried out primarily at temperature in the range of 10-40°C. The degree of foaming of the composition and, consequently, gas content of the single-component, moisture-curable foamed material varies during its application.

EFFECT: obtaining single-component, moisture-curable foamed material which can be used as an adhesive or a sealant/packing material for producing coatings or filling hollow structures with foamed material, particularly vehicles.

20 cl, 4 dwg, 1 ex

FIELD: process engineering.

SUBSTANCE: invention may be used for production of long sheet reinforced fluoroplastic billets for friction assembly operated without lubrication. Polydisposed polymer film is produced from fluoroplastic-4 or from compositions based thereon. Strip mesh power are filled by said film by rolling said film on both sides. Produced sheets are wound on rolls to be fitted in limiting mandrels with no clearance. Billets are sintered at 643-653 K and pressure developed by expansion of fluoroplastic-4 and cooled down thereafter. Billets are withdrawn from mandrels and passed through rolls.

EFFECT: simplified procedure, expanded range of products.

2 ex

FIELD: process engineering.

SUBSTANCE: invention relates to production of crimped heat-insulated pipeline. Pipeline comprises at least one inner pipe, crimped outer pipe spaced therefrom and made of synthetic material and a ply of foamed synthetic material to fill the spacing between both pipes. First, ply of foam is applied to inner pipe to extrude outer pipe thereat. After extrusion of outer pipe, forming tools are used to make crimps on foam ply.

EFFECT: higher flexibility of pipe.

15 cl, 3 dwg

FIELD: containers for storage or transport of articles or materials.

SUBSTANCE: double-chamber container comprises inner chamber, outer chamber which envelopes the inner chamber and head member made by shaping a polymeric material. The head member is secured to the top edges of the walls of the inner and outer chambers. The head member has two passages. The inner chamber is arranged inside the outer chamber for permitting communication of each passage with one of the chambers. The device comprises inner and outer mandrels. The inner mandrel is mounted inside the outer mandrel for moving inward and outward. The both of the mandrels are mounted for joined movement inward and outward in shaping space of the mould. Each mandrel has projection to form the passage provided in the head member and connected with the corresponding chamber.

EFFECT: simplified manufacturing and improved design.

1 cl, 9 dwg

FIELD: containers for storage or transport of articles or materials.

SUBSTANCE: method comprises manufacturing double-chamber tube provided with baffle in the tube head and preliminary manufactured tube housing and tube head, opening mould, dismounting mandrel, removing finished double-chamber tube, setting the baffle in the space of the auxiliary mandrel, manufacturing the blank by setting tube housing on the auxiliary mandrel, shaping material between the mandrel and die, and multiple additional shaping of the tube head accompanied with cooling before opening the mould. The device comprises die, mould mandrel, at least one auxiliary mandrel with space for receiving the baffle, charging and transmitting arrangements, and arrangement for removing the finished tube.

EFFECT: enhanced quality of manufacturing.

4 cl, 7 dwg

FIELD: production of thermoplastic pipes with double walls and connective couplings.

SUBSTANCE: the invention is dealt with a method and a device for production of thermoplastic pipes with double walls and connective couplings. The method of production provides, that the first pipe is extruded into a molding tunnel containing at least one row of folds directed along a trajectory. The first pipe is configured as a corrugated pipe at least on one of the first sections and the pipe is made wider up to the size of the connective coupling at least on one of the second sections. The second pipe is extruded into the first pipe and pressed into the cavities of the first pipe crimps. During the time period, when the first pipe is configured as a corrugated pipe and the second pipe is extruded into the first pipe, the space between the two pipes is subjected to the action of pressure p1, which exceeds the atmospheric pressure. Before the first pipe making wider up to the connective coupling the space between the two pipes is subjected practically to the constant pressure p2 < p1. In the process of extrusion of the second pipe into the first pipe, that has been already widened up to the size of the connective coupling, the second pipe is subjected to action of the pressure p3, exceeding the atmospheric pressure, then it is pressed to the first pipe. Then the pressure p1 is again fed into the space between the two pipes. The device for realization of the method is also presented. The invention ensures an accurate widening of the first pipe for formation of a connective coupling on a corresponding section of the molding tunnel with the help of simple means.

EFFECT: the invention ensures an accurate widening of the first pipe for formation of a connective coupling on a corresponding section of the molding tunnel with the help of simple means.

16 cl,8 dwg

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