SU1488659A1 - Pipeline having inner heat insulation - Google Patents

Description

The invention relates to the insulation of pipelines with internal insulation in construction, energy and engineering. The purpose of the invention is to simplify the design

and improving the efficiency of thermal insulation installed inside the pipe. The invention relates to the thermal insulation of pipelines with internal thermal insulation in construction, energy and engineering.

The purpose of the invention is to simplify the design and increase the efficiency of the insulation installed inside the pipeline.

The goal is achieved by the fact that the pipeline is in the form of a pipe, inside of which a two-layer sealed sleeve of the shells is installed with a gap between the layers, which is provided by a spacer grid installed into the gap. The internal cavity of the sleeve is evacuated. The sleeve may be connected to the pipe one-piece or with the possibility of a connector.

Figure 1 presents the proposed pipeline, a common fork; Fig.2 sleeve; in fig. 3 - the same, option;

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wires The goal is achieved by the fact that the pipeline is in the form of a pipe, the internal insulation of which is provided by two-layer sealed shells of the shells with a gap between the layers, which is provided by the expansion grille. The internal cavity of the sleeves can be evacuated. When the pipeline is filled with a working medium (liquid or gas), the latter penetrates into the gap gap between the pipeline and the sleeve. The thermal resistance of the structure consists of a sleeve with a gas or vacuumized interlayer and a slit layer of the medium between the sleeve and the pipeline. 2 hp f-ly, 6 ill.

figure 4 - the fastening of the sleeve with a pipe; in fig. 5 - the same, option; figure 6 - the device of the ends of the sleeves.

The pipeline consists of a pipe 1 and a sleeve 2, which includes (figure 2) inner 3 and outer 4 shell and spacer grid 5. The lattice is made in the form of a corrugated spacer of low heat conductive metal. As the lattice, the rods 7 and the separator 6 holding them can be used (fig.Z). The sleeve is fixedly fixed to the pipe (figure 4), for example, by welding spacers 9 to the lining 8. The sleeve cavity is sealed when welding the end rings 10. It is possible removable fastening the sleeve (figure 5) using the collet fastening it on the figure lining 11 with the implementation of the connection5 C 1488659

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sleeve tip collet grooves 12.

If necessary, it is possible to enhance the thermal insulation of the contact area of the sleeves by the device of the ends of the sleeves as indicated in Fig.6. The sleeves have mutually mating shelves at the ends, providing a telescopic connection of their ends with the required overlap and end clearance 13. Each sleeve 2 at one end is tightly connected to a spacer 9, which when the pipeline is assembled is welded by an annular seam with lining 8

The pipeline works as ο · at a time.

When it is filled with a stream of hot liquid or gas, the gap gap between the sleeve and the body is also filled. The pressure of the medium presses the shells 3 and 4 to the grid 5. Between the working medium and the atmosphere surrounding the pipeline, a heat leakage flow is established, which is determined by the temperature difference and the thermal resistance of the insulation of the pipeline. One part of the thermal resistance is the resistance of the package of the sleeve 2. Heat is supplied to the shell 4 through the grid 5 and through the air gap of the sleeve. The second thermal barrier is the medium layer. between the sleeve and the housing. In this case, the thermal resistance of the gas layer is several times higher than the resistance of the liquid layer, since the thermal conductivity>, gases are much lower than the thermal conductivity of the fluids. Natural convection of media in interlayers slightly increases heat transfer between the walls. A small part of the heat is transferred to the pipe body due to the thermal conductivity of the connection of the sleeve with the lining 8. Outside, the pipeline is cooled by heat transfer to the environment taking into account its natural convection.

The effectiveness of the proposed insulation depends on the structural parameters of the pipeline. Increasing the thickness of the gaps between the walls, it is possible to significantly reduce heat leakage. When performing a lattice in the form of rods, heat transfer due to the thermal conductivity of the rods can be made much lower than the heat transfer through the air layer. Vacuuming the package allows you to exclude this type of heat transfer. The implementation of the rods 7 from a material with low thermal conductivity, for example, from ceramics or plastics such as AG4, allows to further reduce heat transfer.

Claims (4)

Claim 1. Pipeline with internal insulation mainly for high-temperature and low-temperature fluids, containing a pipe and insulating sleeves located on the inner side, fixed at one end on an insulated pipe, characterized in that in order to simplify the design and increase the efficiency of thermal insulation, the free end of each sleeve is paired with the fixed end of the next Vtulka telescopic, with the ability to compensate for their temperature movements and penetration of the working medium into the cavity between the insulated pipe and the sleeve. 2. The pipeline according to claim 1, about t l and hayas the fact that the sleeve is made in the form of a two-layer sealed package of shells with installed. between the layers of the spacer grid. 3. The pipeline according to claim 1, in that the internal cavity of the bag is evacuated. 1488659 4 ϊ £ (Reg. 1 6