JPH0914579A - Pipe heat insulating material and manufacture thereof - Google Patents

Abstract

PURPOSE: To improve heat insulating performance so as to be suited for mass production, by dividing a heat insulating material bilaterally symmetrically into two parts in its center of longitudinal direction, providing a cut opening part along a radial direction over a longitudinal direction total length in a bending outer side in the one part, and providing a cut opening part in a bending inner side in the other part. CONSTITUTION: A pipe heat insulating material 1, having a bending part corresponding to an elbow bending part, is divided into two respective parts 2, 4 bilaterally symmetrically in the lengthwise directional center of this pipe heat insulating material, to provide in the one part 2 a cut opening part 3 along a radial direction over a longitudinal direction total length in a bending outer side part. In the other part 4, a cut opening part 3 is provided along a radial direction over a longitudinal direction total length in a bending inner side part. Needless to say, in the part 4, a cut opening part 3 may be provided along a radial direction over a longitudinal direction total length in a bending outer side part, and further in the part 2, a cut opening part 3 may be provided along a radial direction over a longitudinal total length in a bending inner side part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat insulating material for piping and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, as a heat insulating material for pipes, a glass fiber web is wound around a mandrel, the thermosetting resin binder in the web is heated and cured, and then the mandrel is taken out to obtain a straight cylindrical body. Was used. When the pipe heat insulating material is applied to the elbow portion of the pipe, since the tubular body is bent and attached, a tensile force is generated on the bent outer side, a fiber is pulled, and a compressive force is generated on the bent inner side. As a result, the fibers bulged against the compressive force and were not easily bent. In addition, even if it was bent, there was a problem that unevenness in heat insulation occurred due to thinning on the outside bent, and dense fibers on the inside bent, and workability was also poor. .

For this reason, pipe heat insulating materials suitable for the shape and size of the pipe have been individually molded, but various heat insulating materials are required depending on the type of pipe.
Since versatility cannot be obtained and various molds for molding the heat insulating material are required, mass production cannot be performed and the manufacturing cost becomes high.

In order to improve the above-mentioned prior art, the following two cases have been proposed as having good workability, being able to be used universally for pipes having different bent shapes and having reduced costs.
Japanese Unexamined Patent Publication (Kokai) No. 6-174187 discloses a heat insulating material in which a cut is made in a circumferential direction at a portion corresponding to a bent portion of a pipe, and the cut portions are evenly distributed and extended when bending the inner and outer pipes. . Further, Japanese Patent Laid-Open No. 6-137485 discloses a pipe heat insulating material in which fibers are molded so as to be oriented in a direction along a plane intersecting the axis and covered with a burnable outer shell.

[0005]

However, in the case of the above-mentioned JP-A-6-174187 and 6-137485, when both of them are naked and the outer skin is not used, there are many cuts and cut points, and therefore the fiber There is the inconvenience that there is significant scattering and it cannot be used as it is. In addition, the number of steps such as cutting and cutting is increased, mass production is not possible, and the cost is still higher than that of a general-purpose pipe heat insulating material. Especially in the latter case,
There is also the inconvenience that the outer cover is limited to a flexible one, such as an aluminum foil embossed body. The object of the present invention is excellent in heat retention performance and capable of mass production,
It is an object of the present invention to provide a heat insulating material for pipes with less scattering of fibers and a method for producing the same.

[0006]

The pipe heat insulating material of the present invention comprises:
In order to achieve the above object, in a pipe heat insulating material having a curved portion corresponding to the curved portion of the pipe joint portion, which covers the outer peripheral surface of the pipe joint portion having the curved portion of the pipe, the center in the longitudinal direction of the heat insulator. The left and right parts are symmetrically divided into two parts, one of which is provided with a cutout along the radial direction on the outside of the curve along the entire length in the longitudinal direction, and the other part is provided on the inside of the curve along the entire length in the longitudinal direction. It is characterized in that an incision is provided along the radial direction.

According to the method for manufacturing a pipe heat insulating material of the present invention, one of the dividing members obtained by bisecting the pipe joint portion having the curved portion of the pipe symmetrically at the center in the longitudinal direction is provided on the dividing surface.
A fibrous web is wound around a web winding core provided with a plurality of die units each having a shape obtained by rotating the split surface of one of the split members and the split surface of the other split member by rotating it by 0 degree, and heat forming After obtaining the molded body, a cutout is formed on one side of the molded body along the entire length in the longitudinal direction along the radial direction, and the cutout is opened to remove the core, and the molded body is cut into the mold unit. A tubular body is obtained by cutting the joint body along the joint surface, and then the tubular body is cut along the joint surface between the one division member and the other division member to combine the pipes. Characterized by obtaining a heat insulating material.

Further, in the above manufacturing method, when cutting the molded body, the molded body is cut along the joint surface between the one divided member and the other divided member to obtain a tubular body, A pipe heat insulating material may be obtained by combining pieces obtained by cutting the shaped bodies along the joint surface of the mold unit.

[0009]

According to the pipe heat insulating material of the present invention, one of the split members obtained by bisecting the pipe joint having the curved portion in the longitudinal center at the center in the left-right direction is rotated by 180 degrees on the split surface. It is produced by using a mold unit having a shape obtained by joining the division surface of the division member and the division surface of the other division member,
At the time of use, the cut member with a shape corresponding to the divided member is covered along the outer peripheral surface of the pipe joint, so it can be installed in the pipe joint of the pipe without gaps, like the molded product, and the heat retention performance Excellent in.

Further, the molded product is formed in such a shape that the pipe joint is divided into two parts in the vertical direction along the longitudinal direction so that the cross section has a semicircular shape, and this is installed in the pipe joint part for use. Although it cannot be fixed without a fixing metal fitting when installed in the pipe joint part, the heat insulating material of the present invention has a longitudinally curved outer part on one side in each of the two parts symmetrically divided in the longitudinal center. Since there is an incision along the radial direction over the entire length in the direction and an incision along the entire length in the longitudinal direction on the other side on the inside of the curve, press the incision like a normal pipe heat insulating material. Can be expanded and easily installed on the pipe joint,
Can be fixed without special fixing brackets.

Further, since the pipe heat insulating material of the present invention does not need a cut line for bending and has a small number of cut portions, the fibers are less scattered even when used naked. Further, the pipe heat insulating material of the present invention has a shape that follows the shape of the pipe joint, and since it is not necessary to bend it to fit the pipe joint, when a skin material is used, it is not rich in elasticity and is usually It ’s fine.
Further, according to the method for manufacturing a pipe heat insulating material of the present invention, it can be molded in the same manner as a normal pipe heat insulating material, and then only cut and processed, and moreover, a heat insulating material for a large number of pipe joints from one molded body. Can be mass produced.

[0012]

Embodiments of the present invention will now be described with reference to the drawings, taking an elbow as an example of a pipe joint having a curved portion.
As shown in FIG. 1, in the pipe heat insulating material 1 of the present invention having a curved portion corresponding to the curved portion of the elbow, each of the portions 2 and 3 symmetrically divided into two in the center in the longitudinal direction has one of the two portions. The part 2 is provided with an incision 3 along the radial direction on the curved outer side along the entire length in the longitudinal direction, and on the other part 4 on the curved inner side in the radial direction over the entire length in the longitudinal direction. The incision part 3 is provided along it. Of course,
The part 4 is provided with an incision 3 on the curved outer side along the entire length in the longitudinal direction along the radial direction, and on the part 2 on the curved inner part along the radial direction along the entire length in the longitudinal direction. 3 may be provided.

Next, a method of manufacturing such a pipe heat insulating material will be described with reference to FIGS. 2, 3, 4 and 5. FIG.
As shown in FIG. 3, the mandrel (web winding core) 5 used in the present invention is divided into two parts, the elbow part 6 of the pipe, which is symmetrical at the center in the longitudinal direction, to obtain the dividing members 6a and 6b. The dividing member 6b is rotated by 180 degrees on the dividing surface so that the dividing surface of the one dividing member 6b and the other dividing member 6a are rotated.
A die unit 7 having a shape obtained by joining the divided surfaces of 1 and 2 is obtained, and a plurality of die units 7 are joined. Of course, instead of rotating one of the split members 6b, the other split member 6a may be rotated 180 degrees on the split surface, and the mold unit may be manufactured as described above.

Until the cylindrical body 10 is formed by cutting the molded body 8 (FIGS. 2 and 3) obtained by winding the glass fiber web around the mandrel 5, the method described in JP-A-5-280689.
It is carried out as follows according to the method described in the publication. First, prepare raw cotton that has been cut to a certain size, load the raw cotton on the supply conveyor, insert the raw cotton transferred by the supply conveyor between the mandrel and the press roller, and wind the raw cotton on the mandrel while pressing it with the press roller. Rotate to form a core product.
Next, the obtained core mold product is housed in the lower mold and pressed by the upper mold for press molding. After that, the core mold is heated and dried in an oven, and after drying, the upper mold is removed to obtain a molded body. An incision is formed on one side of the molded body along the radial direction along the entire length in the longitudinal direction, the molded body is removed from the lower mold, the incision is opened, and the mandrel 5 in the molded body 8 shown in FIG. Take it out. Next, the molded body 8 is cut along the joint surface 9 of the mold unit 7 to obtain a tubular body 10 as shown in FIG.

The tubular body 10 thus obtained is separated along the joint surface 11 of the dividing members 6a and 6b during use, and the respective portions push the incision portion 3 to a predetermined position of the elbow portion 6 of the pipe. It can be installed while unfolding (Fig. 5). The skin material may be attached to the tubular body 10 before the molded body 8 is cut along the joint surface 9 of the mold unit 7. Further, in the above embodiment, the molded body was first cut along the joint surface of the mold unit to obtain a tubular body, and then the tubular body was used by being separated along the joint surface of the dividing members 6a and 6b.
The molded body may be first cut along the joint surfaces of the split members 6a and 6b, and then cut along the joint surface of the mold unit for use.

There is no limitation on the heating means for heat-molding the core-shaped product to obtain the molded body 8. In addition to the above-described heating in a heating container (oven), for example, Japanese Patent Laid-Open No. 6-1.
As described in Japanese Patent No. 37485, an upper mold and a lower mold, and a hollow mandrel, that is, an upper mold and a lower mold which are composed of an arcuate portion, a mold matching portion, and a frame body in which a closed space-like passage is formed. The mold is formed by penetrating a plurality of ventilation holes in the arc-shaped portion so as to communicate with the inside of the passage, and the space formed by contacting and engaging the mold-matching portion substantially matches the outer contour shape of the molded body. Using the upper mold and lower mold as described above, and supplying hot air using a hollow porous mandrel having a plurality of through-holes formed along the circumferential direction and the axial direction as a mandrel, or for heating with an oven and hot air. You may use both together.

[0017]

According to the present invention, the following effects can be obtained. (1) Mass production of heat insulation materials for pipes with excellent heat insulation performance. (2) The fibers of the pipe heat insulating material are less scattered as in the portion other than the pipe joint portion having the curved portion. (3) The skin material is the same as the skin material used for the portion other than the pipe joint portion having the curved portion, and no special material is required. (4) Manufacture is easy and moldability is excellent.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a pipe heat insulating material of the present invention.

FIG. 2 is a cross-sectional view of a molded body with a mandrel contained therein for explaining the manufacturing process of the present invention.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is an overall view of a cylindrical body according to the present invention.

FIG. 5 is a schematic view showing a state where the piping elbow portion is kept warm by the product of the present invention.

[Explanation of symbols]

 1 Pipe Insulation Material 2 One Part of Pipe Insulation Material 3 Cutout 4 Other Part of Pipe Insulation Material 5 Mandrel 6 Elbow 6a, 6b Dividing Member 7 Type Unit 8 Molded Body 9 Type Unit Joining Surface 10 Cylindrical Body 11 Dividing Member Joining surface of 6a and 6b

Claims (3)

[Claims] 1. A pipe heat insulating material covering a peripheral surface of a pipe joint portion having a curved portion of the pipe, the pipe heat insulating material having a curved portion corresponding to the curved portion of the pipe joint portion, wherein left and right at a center in a longitudinal direction of the heat insulating material. Each of the symmetrically divided parts is provided on one side with a cutout along the radial direction along the outside of the curve and on the other side over the entire length in the longitudinal direction on the inside of the curve. A heat insulation material for pipes, characterized in that an incision is provided along the radial direction. 2. One of the dividing members obtained by dividing the pipe joint portion having a curved portion of the pipe into two parts symmetrically at the center in the longitudinal direction is rotated 180 degrees on the dividing surface to divide the one dividing member. After the fiber web is wound around a web winding core provided with a plurality of die units each having a shape obtained by joining the surface and the divided surface of the other divided member, and heat-molded to obtain a molded body, the molded body Forming a cutout on one side along the entire length in the longitudinal direction along the radial direction, opening the cutout to remove the core, and cutting the molded body along the joint surface of the mold unit to form a tubular body. And a pipe heat insulating material obtained by combining the products obtained by cutting the tubular body along the joint surface between the one divided member and the other divided member to obtain a pipe heat insulating material. Manufacturing method. 3. A split member obtained by splitting a pipe joint portion having a curved portion of a pipe into two symmetrical parts at the center in the longitudinal direction is rotated 180 degrees in the split surface to split the split member. After the fiber web is wound around a web winding core provided with a plurality of die units each having a shape obtained by joining the surface and the divided surface of the other divided member, and heat-molded to obtain a molded body, the molded body On one side along the radial direction along the radial direction to form an incision portion, open the incision portion to remove the core, and then divide the molded body into the one division member and the other division member. A pipe heat insulation material, characterized in that a pipe heat insulation material is obtained by cutting along the joint surface to obtain a tubular body, and by combining those obtained by cutting the cylinder body along the joint surface of the mold unit. Manufacturing method.