CN1097190C - Thermally insulating enclosure structure, pipeline and method utilizing the enclosure structure - Google Patents

Abstract

An insulating enclosure structure for covering a thermal pipe, comprising: a thermal insulation layer (2), a filler layer (3) and an outer jacket (6) with discharge openings (5). The packing layer is made of water-permeable material. The drain prevents water from entering while allowing water to drain from the packing layer to the ambient environment. This housing structure is particularly suitable for outdoor pipelines in wet conditions. The invention also provides a pipeline and a method of providing a pipeline with an insulating housing structure.

Description

Adiabatic cover structure utilizes the pipeline and the method for this cover structure

Technical field

The present invention relates to a kind of adiabatic cover structure that is used to cover a heated object; described heated object is a pipe for example; a container; a storage tank; a valve or a joint, this structure comprise that layer that a heat insulator that is used to cover described heated object constitutes and one are used for anti-sealing and enter the overcoat of protecting heat insulator or protect outer cover.

A kind of a kind of pipeline and a kind of method that has thermal insulation cover structure pipe that provides that is heated fluid that be used to transmit is provided.

Background technique

The purpose of heat insulator is to reduce to keep the loss of main body at the high temperature institute energy requirement that requires, and reduces the thermal stress to surrounding environment.Overcoat provides protection for entering of anti-sealing and the protection of machinery is provided.Do not wish that in thermoinsulation material inside water or moisture are arranged, because it is the immediate cause that reduces the thermal characteristics of insulating material, and through making structure member corrosion and insulating material aging etc. after a while.

This of cover structure type is particularly suitable for following environment, that is, taking preventive measures at needs prevents ectocine, for example under the environment of Hu Wai weather, excessive humidity or mechanical load.Though the present invention is not ad hoc, special under the situation of temperature variation of great use.This situation of outdoor pipeline under the intermittence heating condition for example; Heating with gap is owing to transmit the batch operation of heated fluid.Because extraneous factor can cause temperature variation rising in the structure in the continuous running process.Described extraneous factor is the splash or the like of sunlight, rain, wind, water for example.Pipeline is installed on the transportation and the storage facilities of oil refining, oil; Chemical processing equipments etc. are common situations.

Think that widely the insulation system that the protection temperature surpasses the main body of ambient temperature will keep dry because from the heat of main diffusion will by in the protective layer inevitably the aperture from the insulation system evaporation with take up some moistures.Yet, after operation a period of time, check that the structure of pipeline finds in insulating material that sometimes moisture or water surpass predetermined and explainable scope out and away.The structure of inspection pipeline also can be found too early wearing out sometimes.

The inventor has found can interpret these phenomena by following discussion: reduce this stage of temperature in overcoat, air will suck in the insulating material by the opening by overcoat from the external world.Because these air can be run into the temperature of decline, corresponding humidity strengthens and forms the globule of condensation at the coldest point, so they can be anywhere.Because insulating material is not to seep water very much, less seeps water at its unaged state at least, it will tend to condensed water is retained in the original place.Under the moistening situation of environment, one deck water film also can form in the outside of overcoat, and this layer water film has been explained the suction along with air, and water can be transported to the further source of insulation system inside.

In insulating material comprised the zone of liquid water, in the stage of elevated temperature subsequently, water can be along with air flows and evaporation, and insulating material has very high permeability to air and water vapour usually.Some air can leave insulation system, may take away some steams.Yet air can be through a zone that relative temperature is lower before leaving insulation system, and some moisture rest on the there with condensation.

Under the situation that pipeline does not temporarily have to use, for example at night, malaria will enter in the insulation system out of doors, stockpile droplet in the overcoat the inside.By day, overcoat heats up, and water will evaporate and remove.When pipe may be during cold part now, tend to build up the water of one deck condensation, only when being heated once more, could eliminate by pipe.In case pipe is heated again, the water that accumulates in the pipe outside will evaporate, and most probable moves with the form of steam, stockpiles down with droplet in the overcoat inboard.

Be installed under the situation of elevated temperature in that a pipe is stable, variation of temperature still can raise, and this is because the variation of surrounding environment, for example rain, wind, water projection and sunlight.Any this temperature variation all may cause water transport, thereby is accompanied by the danger of condensed water in the insulating material.Although the stable temperature that keeps raising can reduce corresponding humidity, in other words, it also must bring the adverse effect of accelerated ageing process.Therefore, all be very harmful even in insulating material, there is wee bit water.

PCT/DK95/00281 discloses a kind of insulating method of pipe, and pipe is remained on than under the low temperature of ambient air temperature, and wherein pipe covers with insulation assembly, and the stopper that comprises the capillary water absorption material is by the insulation assembly setting.This open file is not mentioned the problem that accumulates in the moisture between heat insulator layer and the protection overcoat of eliminating.

PCT/DK91/00132 discloses an insulation system that is used for insulating cold conduit and container, this system comprises: the internal layer of absorbent material, a thermal insulation layer, a barrier layer, the skin that absorbent material constitutes, wherein, absorbent material layer is in contact with one another by the opening at other layer, and purpose is to transmit water by capillarity.The problem that accumulates in moisture between thermal insulation layer and the barrier layer of eliminating is not mentioned in this disclosed application.

Summary of the invention

Purpose of the present invention just provides a kind of thermal insulation cover structure that is used to cover heated object, this cover structure has overcome the existing above-mentioned defective of cover structure of prior art, has particularly overcome the defective that is associated with the disclosed system of WO91/18237 (PCT/DK91/00132).

According to the present invention, a kind of thermal insulation cover structure that is used to cover the heated object surface is provided, has comprised: the thermal insulation layer that heat insulator constitutes is used to cover the heated object surface, above-mentioned layer limits by an internal surface and an outer surface, wherein internal surface contact heated object surface; It is characterized in that, also comprise that packing layer comprises the material of liquid permeable and gas, this layer is limited by an internal surface and an outer surface, and described internal surface contacts the outer surface of thermal insulation layer usually; Protective layer; it provides the block piece of a common watertight; the protection packing layer makes it not to be subjected to the influence of surrounding environment, and above-mentioned protective layer provides a floss hole, and the anti-sealing of this floss hole enters and allows the interior water of packing layer to pass protective layer by the mode of dripping or evaporate and is discharged in the environment.

In this cover structure, thermal insulation layer comprises: the heat insulator in mineral wool, glass wool or other the prior art.Packing layer comprises a kind of capillarity material or a kind of more open material, and for example: net or a kind ofly can form a particulate matter with the connection net in space allows liquids and gases to pass through.By this cover structure, any moisture that accumulates on the protective layer inboard can be transported to a bit along packing layer, and it can be by dripping or being discharged in the surrounding environment by evaporation at this.

According to a preferred embodiment, floss hole is covered with by a kind of capillary materials of suction, when stoping air to pass through, allows water to pass through.So just reduced air circulation in the cover structure.

According to another preferred embodiment, floss hole enters by the anti-sealing of a lip; This lip makes at the water of protective layer flows outside and from the water of outer side collision and turns to.Having reduced water like this finds channel to enter the possibility of cover structure the inside in surrounding environment.

Still according to another preferred embodiment, thermal insulation layer and packing layer are suitable for providing the structure support of protective layer together.Allow to use quite light protection overcoat like this, and do not need overcoat should be able to bear the load of gentle chance, for example walk about and can not lose deformation shape.

Further purpose of the present invention provides a kind of pipeline, and it has avoided existing the problems referred to above of pipeline in the prior art.

Be used to transmit the pipeline that is heated fluid, comprise: one is used to transmit the pipe that is heated fluid, thermal insulation layer, the base closed pipe, and comprise and it is characterized in that heat insulator, also comprise, packing layer, the base closed thermal insulation layer, and comprise the material of permeation liquid and gas, overcoat, the common block piece that seals packing layer and form a common watertight is used to protect packing layer to be subjected to the influence of environment, and putting outward provides floss hole, by dripping or evaporating, allow moisture from packing layer, pass overcoat, be discharged in the surrounding environment; And shutter, being used to cover floss hole, anti-sealing enters.

Further aim of the present invention provides a kind of method, and this method provides the thermal insulation cover structure for pipe, and it has avoided the existing problem of method of prior art.

For a pipe provides a kind of a kind of method of thermal insulation cover structure, described method comprises step: for described pipe provides the heat insulator layer, above-mentioned layer forms a flexible pipe and is sealing pipe; For described flexible pipe provides packing layer, described packing layer permeation liquid and gas and the above-mentioned flexible pipe of base closed; A kind of overcoat of basic watertight is provided on the outside of packing layer, is used to protect filler, prevents the influence that it is subjected to environment; In above-mentioned overcoat, provide floss hole, allow any moisture to pass overcoat to be discharged in the surrounding environment by dripping or evaporating allowing; Be provided for covering the shutter of floss hole, anti-sealing enters.

Description of drawings

Remain further purpose, advantages and features of the invention embody from detailed description of preferred embodiment with reference to the accompanying drawings, wherein:

Fig. 1 is the vertical cross-section view according to first embodiment's a pipeline;

Fig. 2 is the vertical cross-section view according to second embodiment's a pipeline.

Accompanying drawing is schematically, is not necessarily to scale, and has only described inner characteristic of the present invention and those skilled in the art are understood and has put into practice the present invention.For clarity sake, further feature is from scheming deletion.Running through and scheming, identical REFERENCE NUMBER LIST is understood identical or approximate feature.

Detailed description of preferred embodiment

At first with reference to Fig. 1, it has shown the vertical cross-section view of a horizontally extending pipeline.

Fig. 1 has shown the pipe 1 that is used to transmit a kind of heated fluid.The layer 2 that is made of insulating material (for example mineral wool) around the pipe covers.Suction felt pan net is wrapped up in around insulation material layer, and a coating 3 on every side is provided; Coating 3 has from the radially extended folding edge of pipe zone 4.

A sheet material net is wrapped up in around felt mat, in order that the protection overcoat 6 of periphery is provided, it has the fringe region 7 of bending; Radially extend from pipe with narrow space in this folding edge zone.Isolated fringe region defines a slit 5, to hold the cocked bead of felt pan.The overcoat fringe region can not connect by (and do not show) such as rivets, in order that the simple fixation of structure stability.

The width of overcoat fringe region should enough cover the radial component of felt pan, prevents that itself and any little water droplet from colliding.Under any circumstance, the overcoat fringe region should be configured as like this, so that can both turn to and can not contact with the extension of felt pan along any water of overcoat flows outside.If it is the same at least far away that overcoat fringe region and felt pan fringe region radially extend, then these require can satisfy usually all states that pipe is installed, except the vertical tube.

Referring now to Fig. 2 second embodiment of the present invention is described.

Fig. 2 has shown at the axial cross section of a vertical pipeline longitudinally.This chart understands that a pipe 11 is insulated material layer 12 and is covered with.Felt mat 13 forms a flexible pipe that is covered with insulation material layer, and simultaneously, protection overcoat 16 provides last one deck of structure periphery.

Fig. 2 has further shown the space on every side that forms in outermost surface, outermost each upper rim outwards opens, and is similar to a pipe box, is used to receive the corresponding upper rim of following adjacent components.A narrow annular channel 15 is provided in overcoat like this, and this slit 15 limits along periphery by overcoat flange 17, and the flange 14 of felt mat passes overcoat by this slit.

The best tool of the flange of overcoat has the dimensions and form, prevents any collision of felt pan flange and water like this; If overcoat is usually along being covered with the felt pan flange all around, this requirement can be satisfied by pipe vertical or that tilt usually.Under any circumstance, the overcoat flange is made to make along the defluent any water in the overcoat outside and can be diverted and not contact with the projection of felt pan.

The preferred material that is used for insulation material layer comprises other material of mineral wool, glass wool or known technology.Have been found that density 20 to 200kg/m ²The good insulation preformance of the mineral wool in the scope.

The preferable material that is used for packing layer comprises the non-woven mat of glass fibre, polyamide fiber or other synthetic fiber.Have been found that thickness is functional at the 0.2 non-woven fiberglass layer that arrives in the 1.0mm scope.Other material of packing layer comprises bulk material, wherein obtains capillarity by the surface contact that is in contact with one another between the particle, and perhaps packing layer comprises the silk screen of metal or plastics, and for example mesh size is in 1mm arrives the 20mm scope.

The another kind of material that remains packing layer comprises for example packing of diameter bead in 10mm arrives the 20mm scope.In this case, pad or supporting are installed to keep the outer precalculated position that is enclosed within.

Preferred overcoat comprises the plate that a galvanized steel or aluminium are made, and its thickness range is 0.1 to 1.0mm.Plate can be smooth or crumple.Any joint in overcoat is prevented entering of sealing usually according to the predetermined environment in mounting point.

Claims (13)

1. The thermal insulation cover structure used to cover the surface of the heated body, including: A thermal insulation layer made of thermal insulation material is used to cover the surface of the heated body, the above layer is defined by an inner surface and an outer surface, wherein the inner surface contacts the surface of the heated body; it is characterized in that it also includes, a filler layer comprising a liquid and gas permeable material defined by an inner surface and an outer surface, the inner surface generally contacting the outer surface of the thermal insulation layer; A protective layer that provides a generally watertight shield to protect the packing layer from the surrounding environment, said protective layer providing a drain that prevents the ingress of water and allows water in the packing layer to pass through dripping or The way of evaporation is discharged to the environment through the protective layer. 2. The enclosure structure of claim 1, wherein the discharge opening is covered by a water-absorbent capillary material that allows the passage of water while preventing the passage of air. 3. Enclosure structure according to claim 1, characterized in that the discharge opening is shielded from the ingress of water by a lip for keeping any water flowing along the outside of the protective layer and impinging from the outside water diversion. 4. The enclosure structure of claim 1, wherein the thermal insulation layer and the filler layer together provide structural support for the protective layer. 5. The cover structure of claim 1, wherein the padding layer comprises a water-absorbent capillary material. 6. The cover structure of claim 1, wherein the padding layer comprises a non-woven felt pad. 7. The enclosure structure of claim 1, wherein the packing layer comprises a mesh. 8. The enclosure structure of claim 1 wherein the filler layer comprises a layer of loose objects for separating the insulating layer from the protective layer while providing a network of interconnected voids. 9. Pipelines for conveying heated fluids, including: a pipe for conveying the fluid to be heated, A thermal insulation layer substantially enclosing the tube and comprising a thermal insulation material, further comprising, packing layer, substantially enclosing the thermal insulation layer and comprising a material permeable to liquids and gases, Jacket, usually enclosing the fill layer and forming a usually watertight shield for protecting the fill layer from the environment, provided with drains in the jacket to allow moisture to drain from the fill layer, through the jacket, and to the surroundings by dripping or evaporating environment; and a shielding device to shield the discharge from water ingress. 10. A pipeline suitable for vertical installation according to claim 9, characterized in that the discharge port comprises a perimeter slit, divided by the upper and lower edges of the casing, and the upper edge of the casing is outwardly at a certain angle The shielding means is provided by bending to form a lip which forms a protrusion for a drop. 11. A non-vertically mounted pipeline according to claim 9, wherein the discharge port comprises an axially extending slot demarcated by an edge of the jacket. 12 . The pipeline according to claim 11 , wherein the edge of the jacket is bent outward at a certain angle to form a protrusion for dripping liquid. 13 . 13. A method of providing a thermally insulating enclosure structure for a pipe, said method comprising the steps of: providing said pipe with a layer of thermally insulating material, said layer forming a hose enclosing the pipe; providing said hose with a packing layer which is permeable to liquids and gases and substantially encloses said hose; providing a substantially watertight jacket on the outside of the fill layer to protect the fill from the environment; providing drains in said jacket to allow any moisture to escape through the jacket to the surrounding environment by dripping or evaporation; Provide a screen for covering the drain opening to prevent water ingress.

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