RU173453U1 - THERMAL INSULATION PRODUCT FOR PIPES - Google Patents

Abstract

The utility model relates to devices for thermal insulation from mineral wool and can be used for thermal insulation of pipes and pipelines of various diameters: from small to 5000 mm in inner diameter in various industries and in construction at an insulated surface temperature from -180 ° C to +700 ° C. The heat-insulating product is a hollow cylindrical body consisting of radius segments. The cylindrical body is cut out by means of a moving abrasive string from a composite block, which is formed by layers of mineral wool sheets connected by a mineral glue mixture, including a component based on sodium silicate as a component. A useful model provides a simplification of the production of a cylindrical heat-insulating product, increasing the heat-insulating properties of pipe insulation of large diameters, as well as simplifying the installation of the insulating product on pipes and pipelines with an outer diameter of 500-5000 mm.

Description

The invention relates to devices for thermal insulation from mineral wool and can be used for thermal insulation of pipes and pipelines of various diameters: from small to 5000 mm in inner diameter in various industries and in construction at an insulated surface temperature from -180 ° C to + 700 ° C.

Depending on the diameter of the pipes, cylinders of a given shape, half cylinders, segments, or soft rolled or more rigid matte mineral wool insulation are currently used as heat-insulating material.

Cylinders have an undeniable advantage in the thermal insulation of pipelines because of the ease of installation and good thermal protection.

There are two known methods of manufacturing mineral wool cylinders: by winding and milling.

In the first case, the production is carried out by winding the primary carpet of mineral wool on the shells of various diameters, followed by exposure of the resulting cylinder in the furnace, where the binder of the mineral wool is polymerized and the cylinder is molded. This method of production of heat-insulating products is used in particular by the Danish company ROCKWOOL and the Finnish PAROC. Mineral wool insulating products obtained by the described method are known from RU 2540128 (F16L 59/04, F16L 59/14, publication date 02/10/2015), RU 2419022 (F16L 59/14, 05/20/2011), RU 2455555 (F16L 59 / 02, F16L 59/14, publication date July 10, 2012), RU 2406015 (F16L 59/02, F16L 59/05, publication date December 10, 2010), RU 2265700 (E04B 1/80, published December 10, 2005), RU 2162563 (F16L 59/14, F16L 59/22, published 01/27/2001); RU 2265700 (E04B 1/80, published 10.12.2005). By winding, a hollow solid cylinder with an inner diameter of not more than 950 mm and a thickness of not more than 100 mm and a density of not more than 100 kg / m ³ can be obtained. However, the manufacture of insulating products in this way can only be carried out under the conditions of the existing production of mineral wool. The specified method requires expensive equipment.

Milling consists in the manufacture of heat-insulating products by cutting the cylinder or cylinder segments from a standard (finished) mineral wool plate using a moving abrasive string. This method is used by Russian companies HOTPIPE and CATVUL (see RU 92933 F16L 59/00, F16L 59/02, published on 04/10/2010). The disadvantages of this method include the fact that a similar method can produce a heat-insulating product in the form of a cylinder with a small internal diameter of not more than 100 mm. For larger pipes, the thermal insulation device is made in the form of radius segments. So, with a pipe diameter of 108 mm, the thermal insulation device consists of four segments. A pipe with a diameter of 1000 mm will require 22-24 segments of mineral wool with a density of up to 150 kg / m ³ . This is due to the fact that the cylinders / radius segments are made from a finished mineral wool board, and existing technologies for the production of mineral wool boards from basalt fiber make it possible to obtain a sheet with a thickness of only 250 mm, no more. It is obvious that the installation of a larger number of segments on pipes requires significant labor costs. At the same time, a large number of connecting seams reduces the thermal insulation performance of the product.

Thus, the currently existing technologies do not allow the manufacture of a cylindrical heat-insulating product for pipes of large diameters without the use of expensive equipment with a minimum number of segments.

Solving the problem of creating cylindrical heat-insulating products of large diameters, the authors excluded methods of manufacturing the product by winding due to technological and technical impracticability in view of the design features of the equipment. The objective of the utility model is the production by milling of an insulating product for pipes and pipelines with an outer diameter of 500 mm-5000 mm and a thermal insulation thickness of up to 400 mm in the form of a hollow cylindrical body consisting of a minimum number of radius segments.

To solve this problem, the authors studied the well-known designs of heat-insulating products in the form of cylinders and radius segments. Based on the set of essential features, the closest analogue is the tubular casing known from RU 2162563 (F16L 59/14, F16L 59/22, published January 27, 2001). According to the invention, the tubular casing used in the method consists of freely adjacent annular axially ground discs. If necessary, the discs can be glued together so that they form a single element. Disks are cut by stamping from a stack of sheets of mineral fibers oriented in planes parallel to the sides of the sheets with a band or string saw in the direction of movement that is perpendicular to the main surfaces of the sheets of mineral fibers. The disadvantages of such an insulating product is the presence of a large number of connecting seams in the longitudinal and transverse directions, which reduces the efficiency of thermal insulation and requires the mandatory presence of sheet material, for example, aluminum foil for wrapping a tubular shell in a single structure. It should also be noted that the manufacture of the product is associated with a large number of waste. And grinding of each disk makes the production of the finished shell expensive and complicated. In addition, as indicated in the description, the diameter of the finished product cannot be more than 100 mm. The reasons that impede the achievement of the following technical result by the closest analogue can be attributed to the fact that ready-made mineral wool plates are used for cutting disks, the thickness of which, as mentioned above, is limited by technological reasons.

When solving this problem with a combination of essential features, several technical results are achieved at the same time: simplification of the production of a cylindrical heat-insulating product, increasing the insulating properties of pipe insulation of large diameters, and also simplifying the installation of a heat-insulating product on pipes and pipelines with an external diameter of 1000 mm-5000 mm

These technical results are achieved by the fact that in a heat-insulating product made of a fibrous material in the form of a hollow cylindrical body by milling, according to a utility model, a cylindrical body consisting of radius segments is formed by layers of mineral wool glued together.

A useful model is illustrated by the following materials.

In FIG. 1 - General view of the insulating product,

In FIG. 2 - shows a composite block from which a heat-insulating cylinder is made by milling in the form of a hollow product or radius segments;

In FIG. 3 - shows the options for milling the cylinder (segments): on A - milling along the y axis, on B - parallel to the side, the x axis, on B - from the rear along the z axis);

In FIG. 4 is an example of mounting a heat insulating product on a large diameter pipe.

The essence of the proposed technical solution is as follows. For the manufacture of a heat-insulating product 1 according to the proposed utility model, first from the finished mineral wool boards 2 a composite block 3 is made, which is a parallelepiped. For this, mineral wool slabs 2 with synthetic binder, for example, grades 75, 125, 175, 225, made in accordance with GOST 9573-96 “Mineral wool slabs with synthetic binder heat-insulating” or according to TU 5762-004-58256885 with a density of at least 60 kg / m ³ (mineral wool boards) are glued together. For the formation of block 3, plates 2 can be used, both identical in thickness and density, and with different indicators of the indicated parameters. Block Size Range:

H - from 50 mm to 1100 mm

L - from 100 mm to 1200 mm

D - from 100 to 2000 mm

d - from 50 mm ÷ 200 mm

The number of layers is chosen arbitrarily within the sizes H, L, D. The plates are arranged so that the fibers of each layer are directed in the same direction. Since there are irregularities (perforations) on the surfaces of the plates formed by the forming elements during its manufacture, in order to improve the adhesion of the plates to each other, the surfaces of each plate from the upper and lower sides are pre-ground. An adhesive mixture is applied to the polished surface of each plate. The application of the adhesive mixture on the upper surface of the plates is carried out automatically on the equipment, which is a set of spray nozzles for applying glue and a roller table, which ensures the advancement of the plate under the nozzles. The adhesive used is a mineral adhesive mixture comprising a compound based on sodium silicate as a component. Then collect the plates in the block. To do this, the first plate is placed on the pallet so that the upper surface with the adhesive composition is on top. The second plate is positioned by connecting its upper surface with glue to the upper surface of the first plate, i.e. connect two surfaces treated with glue, while the lower surface of the second plate becomes upper. Glue is applied manually to the surface of the second plate using a spray gun. The remaining plates are laid in a similar way. No glue is applied to the upper surface of the upper plate. Further, to improve the adhesion of the layers, a load is installed on the surface of the upper plate and is held until the adhesive mixture is fully polymerized for 24-48 hours. As cargo, for example, two metal plates of a block size of 15 kg each are used. At the place where the workpiece is held, the air temperature must be at least 30 ° C.

Next, from the finished composite block, in accordance with the task, a heat-insulating product of a given diameter is cut using a moving abrasive string. The proposed technology allows to obtain hollow cylinders in the form of a single design of any diameter. However, transportation and installation of heat-insulating products in the form of a hollow cylinder with an outer diameter of 500-5000 mm to the place of pipe insulation are inconvenient. Therefore, for pipes of the specified diameter, a heat-insulating product is more profitable to perform from a minimum number of segments. Thus, on the one hand, the problem of delivering the product to the installation site is solved, on the other hand, the insulation of pipes and large pipelines is simplified, since the proposed device does not require connecting a large number of segments to each other, and the thermal insulation properties of the product are also improved by minimizing the joint seams. So, in a known manner described above, for a pipe with a diameter of 1000 mm from a mineral wool board with a density of up to 150 kg / m ³ produce 22-24 radius segments, while the proposed technology allows us to produce a heat-insulating product in the form of a cylinder or 2-4 radius segments, depending on customer requirements.

To cut a hollow cylinder or radius segments, the composite block is installed on a programmed contour cutting machine. Depending on the given program, segments of a given size are cut out, for example, in the direction of movement that is perpendicular to the mineral fibers of the composite block. It should be noted that it is possible to cut cylinders / radius segments from a composite block in three directions: along the x, y, z axes. (see Fig. 3), which has a significant impact on the technical characteristics of the product.

The tests showed that the inner diameter of the finished heat-insulating product can be performed by anyone depending on the specific task of the customer, so the product range is more than 1000 types, and the physicomechanical parameters of the heat-insulating product meet the established requirements for the corresponding heat-insulating products. Get the finished product in the form of a cylindrical body, consisting of radius segments. The length of the finished product is up to 1200 mm, which corresponds to the length of the mineral wool boards from which the composite block is formed.

Thus, the finished heat-insulating product 1 is a cylindrical body consisting of radius segments 4 formed by layers of mineral wool boards 2 glued together (Fig. 1).

In FIG. 4 shows a diagram of mounting the product on a heat insulating surface. For thermal insulation of a pipe or heat conduit, a cylindrical product in the form of radius segments is delivered in place. Segments are made in production by order of the customer with the required radius. The number of segments depends on the diameter of the pipe and can be from 2 or more. They enclose the pipe with radius segments so that the pipe is inside the cylinder, after which the segments are fixed with wire or crimp clamps.

The practical use of the utility model is shown in the following example.

Example 1. For thermal insulation of a pipeline with a diameter of 30 mm, a thermal insulation cylinder made of mineral wool 1200 mm long, with an internal diameter of 30 mm and a thickness of 20 mm was used. Ready-made cylinders are delivered to the place of pipeline insulation, they cover a heat-insulating surface along both sides of a longitudinal section and fix the connecting surfaces with crimp clamps.

Example 2

For thermal insulation of a pipeline with a diameter of 600 mm, two segments of mineral wool 1000 mm long, with an internal diameter of 600 mm and a thickness of 100 mm were used. Installation was carried out at the site of pipeline insulation. To do this, they covered the pipeline with radius cylinders, and then halves were fastened in two places along the horizontal axis.

Example 3

For pipes with an external diameter of 1200 mm, a cylindrical body of four segments is made. Parameters of the finished product: length 800 mm, the inner diameter of the cylindrical body formed by segments - 1200 mm, thickness 120 mm.

Transportation and storage of products is carried out in accordance with the requirements of GOST 25880 and GOST 23208-2003.

Thus, the claimed utility model solves the problem of milling the production of insulating products for pipes, large pipelines. When using the utility model, the efficiency of thermal protection is increased due to a significant reduction in connecting seams, the insulation of pipes and large pipelines is simplified. The production of a heat-insulating product has advantages over known technologies due to the milling of the product from the finished composite block.

Claims (3)

1. Thermal insulation product made of fibrous material in the form of a hollow cylindrical body, characterized in that the cylindrical body, which is a radius segment, is formed by layers of mineral wool glued together. 2. The heat-insulating product according to claim 1, characterized in that it is formed by radial segments of mineral wool plates, which are arranged so that the fibers of each layer are directed in the same direction. 3. Thermal insulation product according to paragraphs. 1, 2, characterized in that the mineral wool boards are connected by a mineral adhesive mixture comprising, as a component, a compound based on sodium silicate.

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