Multi-layer pipe out of composite material

FIELD: machine building.

SUBSTANCE: multi-layer pipe is made out of composite material corresponding to reinforced materials in form of alternate mono-layers with cross and lengthwise laying of reinforced material impregnated, for example with thermo-reactive binding. Binding consists of internal and external structure layers divided with a barrier layer. The barrier layer is made out of a layer of heat insulating foam applied on external surface of the internal structure layer and of an additional layer arranged between the layer of heat insulating foam and internal surface of the external structure layer. The latter corresponds to successively lain metal screens out of continuous bands divided with polymer material.

EFFECT: increased heat resistance of wall of multi-layer pipe.

5 cl, 1 dwg

 

The invention relates to the field of composite fibrous material and can be used for the manufacture of tubular products, in particular multilayer pipes for hot water supply systems of centralized and decentralized heat and water supply.

Currently, it is increasingly clear that the most effective way to reduce or limit consumption of energy is more efficient to use. In the field of housing and utilities of the vast reserves of energy conservation associated with the prevention of loss during transportation of the fluids in the system, heat and water. Use in district heating systems, steel or copper pipes is irrational, because their transport, handling, Assembly and insulation remains very expensive. In addition, problems with corrosion, which often manifest in these pipelines, significantly reduce the time of operation, requiring constant repair.

It is known that non-metallic pipes, for example, different polymer structures, successfully replace steel and metal pipes [see description to the patent of Russian Federation №2224160, MCL F16L 9/12, publ. 10.12.2002,]. However, the problem of diffusion of gases, water vapor through polymeric materials limits their functional the possibilities due to the significant heat losses.

It is known for the use of GRP pipes due to their high physical-chemical properties, as they possess great strength, as well as specific properties like fire resistance, corrosion resistance, water and funginertness. Fiberglass in combination with polyester, epoxy, phenol-formaldehyde and other resins allows you to get the materials, strength surpassing the best grade of steel, resistant against aggressive environments, well-opposing shock and vibration loads [Mallinson j. The use of products made of glass-reinforced plastics in chemical industries. Transl. from English. Ed. Vielbein and Semperon. - M.: Chemistry, 1971, 240 S.].

However, the successful use of pipes made of fiberglass (FRP) possible with additional measures insulation of pipes due to insufficient thermal resistance of the pipe material due to the relatively small wall thickness.

It is known that to provide the necessary mechanical strength and corrosion resistance pipe fiberglass should be layered. Typical structure of the tube includes an inner chemical-resistant layer, the second layer, which together with the first provides structural integrity and chemical resistance of the pipe [Mallinson j. The use of products made of glass-reinforced plastics in imicheskih industries. Transl. from English. Ed. Vielbein and Semperon. - M.: Chemistry, 1971, 240 S.]. To ensure the impermeability of the walls of the articles made of composite fibrous materials (CME), as well as improving the moisture resistance of the composite-fiber systems (CWS) is recommended to apply a layer of foil or a flexible film material [Tsyplakov OG Design products made of composite fibrous materials. - Leningrad: Mashinostroenie, Leningrad. separa-tion, 1984, s].

However, the proposed measures to improve the design of the pipe did not address issues of reducing heat loss, which also limited the functionality of the composite fibrous materials and composites-fiber systems.

A known system of pipes for supply of water, preferably hot for district heating, Central heating and/or water supply, consisting of a multilayer pipes made of polymeric material, heat insulation, environmental multilayer pipe, and the outer sheath, in which the multilayer pipe includes a pipe body preferably made of cross linked polyethylene and the barrier layer of liquid crystal polymer [see description to the patent of Russian Federation №2224160, MCL F16L 9/12, publ. 10.12.2002,]. Multilayer pipe may include one or more intermediate layers of connective material between the pipe body and the barrier layer. Systems which may include at least two multilayer pipes, prisoners inside outer shell.

The above-described technical solution ensures pipes for hot water supply systems, which have considerable advantages compared to metal pipes and satisfactory performance relative to diffusion of gases and water.

However, the strength characteristics of polymer component of the pipe at high temperatures is significantly reduced, which limits the period of use of the system described above. Moreover, such tubes, in the case of applications for heating, is not protected from losses of energy due to radiation of heat into the environment.

Closest in purpose, technical essence and the achieved result when using the claimed solution is a pipe made of composite materials made of reinforcing materials in the form of alternating monolayers with transverse and longitudinal stacking reinforcing material is impregnated with, for example, thermosetting binder, consisting of inner and outer structural layers separated by a barrier layer [see RF patent №2221183, MCL F16L 9/12, publ. 10.01.2004,]. The inner and outer structural layers separated by a barrier layer with a high content of binder. Reinforcing material is laid in a zigzag, the top of each loop fixed clamping glass yarns, education is UYa cross longitudinal transverse structure, in which each subsequent monolayer offset from the previous one in the longitudinal direction and in the circumferential direction.

The above solution has high integrity, strength and other positive qualities of fiberglass pipes. However, their use in heat supply systems limited by the low thermal resistance of the pipe material due to the relatively small wall thickness.

Therefore, the aim of the proposed technical solution is to increase thermal resistance of the wall of multilayer pipes, in particular, of a composite material.

This objective is achieved in that in the known multi-layer pipe made of composite materials made of reinforcing materials in the form of alternating monolayers with transverse and longitudinal stacking reinforcing material is impregnated with, for example, thermosetting binder, consisting of inner and outer structural layers separated by a barrier layer, according to the invention the barrier layer is made of a layer of insulating foam applied to the outer surface of the inner structural layer and the additional layer located between the layer of insulating foam and the inner surface of the outer structural layer, made in the form sequentially from the its metal screens from continuous strips, divided polymeric material.

According to the invention the metal screens made of metallized on two sides of a polymer composite material.

According to the invention the metal screens made of stepped metallized on two sides of a polymer composite material.

According to the invention the metal screen is made by winding a metallized on two sides of the polymer material, while the next layer is separated from the previous layer polymer composite material.

According to the invention the metal screens are made continuous winding of metallized on two sides of the polymer material, with each next step is separated from the previous layer polymer composite material.

According to the invention as a gas metallizing layers of polymeric material used metals from a number of aluminum, chromium, Nickel, copper, tin or alloys based on them.

As can be seen from the statement of the essence of the proposed technical solution, it differs from the prototype and, therefore, is new.

Technical solution involves an inventive step. The basis of the invention is the task of improving multilayer pipes made of composite material, in which, following the implementation of the barrier layer from the layer of heat is hitlerowsa foam, deposited on the surface of the inner structural layer and the additional layer located between the layer of insulating foam and the inner surface of the outer structural layer, made in the form of sequentially stacked metal screens from a continuous speed strips separated by a polymeric material, is provided a new technical result. It lies in the fact that the heat flow from the inner structural layer not only inhibited insulating foam due to its low thermal conductivity, but also "locked" inside the product due to multiple reflections from metal screens, between which there are no gaps that would serve as a place unimpeded heat transfer from layer to layer and further to the outer structural layer. The stepped nature of the layers provides localization of heat in separate cells, reducing the likelihood of loss due to the presence of local temperature gradients along thermal network. Due to this, the temperature of the outer surface of the outer structural layer remains almost equal to the ambient temperature when the temperature to 115°C. Thus, heat loss is practically reduced to zero.

Know the use of thermal insulation in stekloplastikovyh insulated t is Ubah, designed to reduce heat loss [see Greulich VI, Stekloplastikovye insulated pipes. Magazine "Plumbing", No. 6, 2005]. High thermal insulating ability of the design ensures high efficiency of heat pipes, which allows for a 20-30°C to reduce the required temperature of the coolant at the outlet of the boiler.

The proposed solution is fundamentally different from the above fact that heated to the temperature of the coolant of the internal structural layer is itself a source of thermal radiation and in the above case (Greilich VI) infrared radiation heats the environment. The proposed technical solution, the radiant energy "locked" inside the product are numerous, for example, aluminum (because they have a small degree of blackness) screens.

The proposed solution is industrially applicable, because it can be used for the manufacture of multilayer pipes made of composite materials in modern technological equipment, and products made on the basis of this technical solution, can also be used in the most extreme conditions - in shipbuilding, aviation, rocket technology, equipment, petrochemical and gas industry, including the supply in the housing and comm the national economy.

The proposed multi-layer pipe made of composite materials illustrates the drawing.

Pipe made of composite materials 1 consists of an inner and outer structural layer 2, between which is located the barrier layer consisting of a layer of insulating foam 3 and layer sequentially stacked n=5-6 metal screens 4, made of a continuous speed metal bands, and located between a layer of insulating foam and the inner surface of the outer structural layer. Metal screens are alternately separated by layers of a polymer or polymer composite material 5. Metal screens can be made in the form of step metallized on two sides of the polymer film.

The formation of the proposed multilayer pipes made of composite materials is carried out by the method of continuous winding, similar to those described in the book "the Manufacture of GRP pipes" [see Andreev GY, Serdjukov G., Shevchenko VA, Dardik YA - Kharkov: Publishing house of KSU, 1964, 62 S.].

As can be seen from the description of the essence of the proposed technical solution, tube, made on the basis of the proposed technical solutions, capable of providing a temperature difference from the temperature of the coolant to the ambient temperature, that is, to minimize heat loss to the environment,which in turn will allow, for example, to reduce the temperature of the coolant and reduce heating costs, for example, in utilities.

1. Multi-layer pipe made of composite materials made of reinforcing materials in the form of alternating monolayers with transverse and longitudinal stacking reinforcing material is impregnated with, for example, thermosetting binder, consisting of inner and outer structural layers separated by a barrier layer, wherein the barrier layer is made of a layer of insulating foam applied to the outer surface of the inner structural layer and the additional layer located between the layer of insulating foam and the inner surface of the outer structural layer, made in the form of sequentially stacked metal screens of continuous strips separated by a polymeric material.

2. Multi-layer tube made of composite material according to claim 1, characterized in that the metal screens made of metallized on two sides of a polymer composite material.

3. Multi-layer pipe made of composite material according to claim 1 or 2, characterized in that the metal screens made of stepped metallized on two sides of a polymer composite material.

4. Multi-layer pipe made of composite material is in according to claim 3, characterized in that the metal screen is made by winding a metallized on two sides of the polymer material, while the next layer is separated from the previous layer polymer composite material.

5. Multi-layer pipe made of composite material according to claim 2, characterized in that as the gas metallizing layers of polymeric material used metals from a number of aluminum, chromium, Nickel, copper, tin or alloys based on them.



 

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