JPH09133290A - Manufacture of heat insulating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the manufacture of a heat insulating device to be installed in an elbow part by cutting the cylindrical raw material in response to the curvature of the elbow part of a pipeline, and arranging obtained cylindrical divided pieces so that both large longitudinal length sides abut on each other and that both small longitudinal length sides abut on each other, and attaching a bonding seat for integration. SOLUTION: This heat insulating device 1 is formed of a curved semi- cylindrical pieces 2, 3, and in the semi-cylindrical pieces 2, 3, nearly triangle divided pieces 2a-2c, 3a-3c, of which space in the axial direction is formed so as to be smaller, as it comes close to the inside, and larger, as it comes close to the outside, are arranged in an intermediate part thereof, and divided pieces 2A, 2B, 3A, 3B, of which axial length are larger than that of the divided pieces 2a, 3a of the intermediate part, are arranged in both ends. Each adjacent divided piece is bonded by the adhesive material at the cut ends thereof, which coincide with each other in a plane perpendicular to the axis. A metal foil 4 is attached to the outer peripheral surface of each divided pieces 2a-2c, 2A, 2B, 3a-3c, 3A, 3B, and the metal foil 4a, which is attached to the divided pieces 2b, 3b, are left at the time of cutting.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a heat insulating device which is installed on a pipe, and is particularly suitable for an elbow portion where the pipe is bent to a predetermined curvature.

[0002]

2. Description of the Related Art Insulation devices made of fibrous materials, such as glass wool and rock wool, in which layers are oriented in layers are sheathed in piping such as air-conditioning piping and water / sewage piping. The fibrous body used as the heat insulating device has a basic shape of a cylinder, and the fibrous body is expanded into a pipe from an axial opening formed in the tubular fibrous body, and the fibrous body is formed into a predetermined pipe portion. The fibrous body is engaged, and then the opening is fastened with a tape or the like to be mounted.

The pipe comprises a straight portion and an elbow portion curved to a predetermined curvature (hereinafter referred to as a curvature of the shaft, hereinafter referred to as a curvature). The straight portion is provided with a fibrous body formed in a straight cylindrical shape. A curved tubular fibrous body will be attached to the elbow. In this case, the socked fibrous body mounted on the straight portion is prepared from a roll-shaped raw material or a raw material obtained by solidifying fibrin into a roll or a semi-roll from the beginning of a plate-shaped fibrous body, In addition, several types of molds are provided for different tube diameters, and roll-shaped raw materials having different diameters are prepared.

In the case of a fibrous body to be attached to the elbow portion, since the pipe diameter and curvature differ depending on the type of pipe, it cannot be simply rolled or hardened. Therefore,
In the current situation, a curved tubular fibrous body is prepared by using a dedicated mold according to each tube diameter and curvature.

[0005]

However, in molding using a dedicated mold, it is necessary to prepare a large number of dedicated molds depending on the combination of the difference in the tube diameter of the elbow portion and the difference in the bending rate. Therefore, conventionally, in order to manufacture a curved tubular fibrous body, it is necessary to use a model only for the integral multiplication of the type of curvature and the type of pipe diameter, as compared with the case of a straight tubular fibrous body, which increases the equipment cost. There is.

According to the present invention, a curved tubular fibrous body according to the difference in curvature of the elbow portion can be manufactured from a straight tubular raw material by a simple process, and a heat insulating device which can be easily attached to the elbow portion is provided. It is a problem to be solved to provide a manufacturing method.

[0007]

The technical means of the present invention for solving the above-mentioned problems is a straight cylindrical raw material having an outer cover made of a fibrous body, which is a plane perpendicular to the axis depending on the curvature of the pipe. The flat trapezoidal cylindrical divided pieces obtained by cutting with a diagonal angled surface that alternately changes to positive and negative with the angle formed by and between the large axial length side parts and the small axial length side parts. They are brought into contact with each other and a joining sheet is pasted on the outer cover to integrate them, and the integrated curved tubular body is bisected into a curved semi-cylindrical piece, leaving a part of the outer cover on a surface including its axis. Alternatively, it is divided into two parts on the surface including the axis thereof, and then a sheet is attached on the outer cover so that one side end can be opened and closed.

[0008]

According to the first aspect of the present invention, the angle of the oblique surface of the shaft for cutting the straight cylindrical raw material, that is, the angle of the cutting surface for alternately changing the positive and negative with respect to the plane perpendicular to the axis of the raw material is changed. As a result, a flat tubular trapezoidal tubular segment obtained by the cutting has a curved tubular body formed by abutting the side portions having a large axial length and the side portions having a small axial length in an integrated manner. , The curvature according to the curvature of the pipe can be used.

That is, a plurality of divided pieces are cut along an axis oblique surface whose angles are alternately changed with respect to the axis of a roll-shaped raw material, and the divided pieces are coaxial with the side portions having a small axial length. It can be manufactured by joining the cut end faces with a joining sheet so that the side portions having a large length are aligned with each other. Then, with respect to the difference in curvature, it is possible to cope with the elbow portion having an arbitrary curvature by changing the angle of the oblique surface of the shaft, which is positive or negative with respect to the surface perpendicular to the axis.

Therefore, it is not necessary to curve-form the elbow portion for each curvature, and the elbow portion having an arbitrary curvature can be obtained by simply cutting the raw material for a straight pipe having the same diameter by the above-mentioned technical means of the present invention. It is possible to manufacture a curved tubular fibrous body that is aligned with, and to significantly reduce equipment costs.
Further, by dividing the tubular body integrated into a curved tubular shape into the curved half-cylindrical piece connected by the remaining outer skin or the seat attached later, one side end which is not connected by the outer skin or the seat attached later can be opened and closed. , The curved half-cylinder piece can be opened and easily attached to the pipe.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the illustrated embodiments. 1 and 2 show a heat insulating device that can be manufactured by the manufacturing method of the present invention. As shown in FIG. 1, the heat insulating device 1 is mainly composed of curved half cylinder pieces 2 and 3. These semi-cylindrical pieces 2 and 3 have an imaginary curved tubular body that is fitted to the elbow portion of the pipe at an inner cutting line P ₁ and an outer cutting line P ₂ in the only plane including the bending axis (see the direction A). Corresponds to a curved half cylinder cut in two.

Here, the semi-cylindrical pieces 2 and 3 are fibrous bodies in which the fibrous materials are oriented in a layer shape in the circumferential direction B, and the bending rate thereof is substantially equal to the bending rate of the elbow portion in the pipe. And when it is attached to the elbow part, the inner cutting line P ₁
Cut edge 5 each other, the cutting edge 6 with each other at the outer cutting line P ₂ are joined by bonding or the like, the curved tubular body 6, as shown in FIG.

However, the semi-cylindrical pieces 2 and 3 are substantially triangular divided pieces 2a cut into a predetermined number along the plane perpendicular to the axis, with the distance (length) in the axial direction A being smaller toward the inside and larger toward the outside. , 2b, 2c and divided pieces 3a, 3b, 3c
Are arranged in the middle portion in the same order, and the divided pieces 2 having a longer axial length as a whole than the divided pieces 2a, 3a of the intermediate portion are arranged at both ends thereof.
Similar to A and 2B, large divided pieces 3A and 3B are arranged. Each adjacent divided piece, for example, 2A and 2a, 2
The cut end surfaces of a and 2b, 3b and 3c, 3c and 3B, which are coincident with the plane perpendicular to the axis, are joined by an adhesive or the like.

A metal foil 4 such as an aluminum foil is attached to the outer peripheral surface of each of the divided pieces 2a to 2c, 2A and 2B and the divided pieces 3a to 3c, 3A and 3B. Here, the metal foil 4a which is affixed the center between the divided pieces 2b, and 3b are left off upon cleavage at the outer cutting line P _1. As a result, in the semi-cylindrical pieces 2 and 3, the back portion of the curved tubular body 6 is connected by the metal foil 4a.

As will be described later, the metal foil 4a may be a semi-cylindrical piece with a curved tubular body 6 even if the rolled foil is pasted as an outer cover and left uncut. Outside cutting line P ₁ to connect both pieces after cutting into 2 and 3
You may join with the metal foil as a joining sheet along a part of. Furthermore, the split pieces 2A and 2B at both ends and 3A and 3B
On the inner peripheral surface of each of the grooves 7
Is formed. The groove 7 is engaged with, for example, a projection (not shown) of the elbow portion to facilitate positioning in the axial direction.

In the heat insulating device 1 having such a structure, the half cylinder piece 2 is mounted on the lower half of the elbow portion, and the half cylinder piece 3 is mounted on the lower half of the elbow portion. At that time, each cutting end face 5,
Apply adhesive to 6. Further, a tape is attached to the joint between the cut end surfaces 5 and 6 to reinforce the joint. By such an operation, the heat insulating device 1 can be easily mounted on the elbow portion. Since the curved tubular body 6 is separated into the half tubular pieces 2 and 3, the tubular body 6 can be greatly expanded and has a large curvature ratio, so that it can be easily attached to the elbow portion.

Further, as shown by the alternate long and short dash line in FIG. 3, the heat insulating device 1 mounted on the elbow portion may be covered with the cover 8. The cover 8 has one opening 8a on the inside that is substantially parallel to the axial direction A, and forcibly expands the opening 8a to cover the heat insulating device 1. The opening 8a is later fixed with a tape (not shown). Next, a manufacturing process of the heat insulating device 1 will be described with reference to FIG.

FIG. 3 shows a straight roll-shaped raw material. This raw material is formed into a roll at the stage of rolling molding or hardening of the fibrous material. This raw material has an opening 10 parallel to the axial direction A '(that is, a cut is made in the axial direction), as shown by the hatching of a dotted line. In addition, the metal foil 4 is already formed on the outer peripheral surface of the roll-shaped raw material.
(See FIG. 1) is affixed.

The divided pieces 2a to 2c and 3a to 3c are set such that the straight cylindrical raw material is alternately set to have a positive or negative angle with respect to the plane perpendicular to the axis A'according to the curvature of the pipe. It is cut into plane trapezoidal cylindrical divided pieces 2 ′ by the angled diagonal surfaces 9 a and 9 b, and then each divided piece 2 ′ is cut into a cut surface 1 symmetrical with the opening 10.
It is obtained by cutting at 1. However, when cutting the cut surface 11, a portion corresponding to the metal foil 4a, that is, a side portion having a large length S in the central axial direction A'in FIG. 3 is left under a certain condition. The fixed condition is, for example, when the pipe is attached to the pipe, the divided pieces 2b and 3 to be positioned at the central portion of the curve as shown in FIG.
The metal foil 4 of b is left uncut. The divided piece 2'is the cut surface 1
Metal foil 4 of the triangular pieces obtained by cutting in 1
A total of 6 pieces including the upper and lower divided pieces connected by a and arbitrary divided pieces.
Individual pieces are taken out to form a set of divided pieces 2a to 2c and 3a to 3c that match the curvature of the pipe as shown in FIG.

Then, these divided pieces 2a-2 are taken out.
The groups c, 3a to 3c are formed by joining the cut end faces so that the side portions having a small length T in the axial direction A ′ and the side portions having a large length S in the axial direction A ′ are aligned with each other. The half-cylinder pieces 2 and 3 shown in FIG. 1 are manufactured. The divided pieces 3A and 2A at both ends are divided into the divided pieces 2a to 2c and 3a to 3c.
After cutting the sheet, a predetermined length in the axial direction may be measured and cut along a plane perpendicular to the axial direction A '.

When the curved cylindrical body 6 is manufactured from such a roll-shaped raw material, the difference in the bending rate can be dealt with by changing the angles of the shaft inclined surfaces 9a and 9b. Also, as in the first embodiment, the curved cylindrical body 6 is cut along two inner and outer cutting lines P ₁ and P ₂ in only one plane including the axis, thereby forming a pair of half cylindrical pieces 2 and 3. Has a symmetrical shape, and a curved cylindrical body 6 is completed by joining the same-shaped ones to facilitate management.

[0022]

As described above, according to the first aspect of the invention, the curved cylindrical body mounted on the elbow portion of the pipe is
It can be formed with an arbitrary curvature by a simpler technical method than the straight cylindrical raw material, and the equipment cost can be significantly reduced and the manufacturing cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state before being attached to a pipe of a heat insulating apparatus according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram for explaining a process of manufacturing the heat insulating device of the first embodiment.

FIG. 3 is an explanatory diagram showing a state where the heat insulating device according to the first embodiment is mounted on a pipe.

[Explanation of reference numerals] 1 is a heat insulating device, 2 and 3 are half-cylinder pieces, 4 is a metal foil, and 4a
6 is a curved cylindrical body, 7 is a groove, and P ₁ and P ₂ are cutting lines.

Claims (1)

[Claims] 1. A method of manufacturing a heat insulating device to be fitted to an elbow portion of a pipe, wherein a straight cylindrical raw material having an outer skin made of a fibrous body is formed into a plane perpendicular to an axis according to the curvature of the pipe. Cut at the angled angled surface where the angle is set to positive and negative alternately,
The flat trapezoidal tubular divided pieces obtained were brought into contact by abutting the side portions having a large axial length and the side portions having a small axial length and pasting a bonding sheet on the outer cover to integrate them, and the integrated The curved tubular body is bisected into a curved semi-cylindrical piece leaving a part of the outer skin on the surface including the axis, or bisected on the surface including the axis, and then a sheet is attached on the outer skin to form one side. A method for manufacturing a heat insulating device, characterized in that the end thereof can be opened and closed.