JP2000304191A - Heat reserving material for bent pipe coupling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify manufacture of a foamed resin molded product, serving as a heat insulation layer mounted on a bent pipe coupling elbow in a no- determined shape, by using a single mold and to mount the molded product on a bent pipe coupling elbow with a large diameter at a low cost. SOLUTION: This heat reserving material molds a foamed resin molded product 2 as a heat insulation layer supposing a maximum value of irregularity in the shape of a bent pipe coupling elbow 1. In the bent pipe coupling elbow 1 having diameter lower than the supposed diameter, the foamed resin molded product 2 is temporarily locked at the bent pipe coupling elbow 1 by protrusions 3 formed on the inner surface of the foamed resin molded product 2. Further, the foamed resin molded product 2 is molded in a state to be divided into a plurality of sections.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention is used as a heat insulating material for piping of water, oil, steam, gas, air and other fluids.
The present invention is used for a bent portion of a pipe. The present invention is particularly suitable for use in a bent pipe joint elbow that bends at 90 degrees.

[0002]

2. Description of the Related Art In a factory plant and the like, pipes are provided for transferring liquid and gas, and a heat insulating material is attached to the outer periphery of the pipes in order to reduce the influence of the temperature of the surrounding environment. For example, when the liquid flowing in the pipe is a low-temperature liquid, the temperature of the low-temperature liquid is affected by the surrounding environment and increases during the transfer. In order to minimize the influence of the surrounding environment, a technique of attaching a heat insulating layer of a foamed resin molded article as a heat insulating material around a pipe is widely known.

FIG. 8 is a side view showing a heat insulating layer mounted on a pipe joint elbow. In FIG. 8, straight pipes 5 are welded (hatched portions in the figure) to both ends of the bent pipe joint elbow 1, respectively. As shown in FIG. 8, a foamed resin molded product 2 as a heat insulating layer is mounted on a bent pipe joint elbow 1. The material of the foamed resin molded product 2 is, for example, styrene foam. Normal,
The foamed resin molded product 2 is divided into two parts by a virtual plane including the center line of the bent pipe joint elbow 1, and a virtual plane including the center line of the pipe joint elbow 1 is sandwiched from both sides of the bent pipe joint elbow 1. It is attached so that Actually, the straight pipe 5 is provided with a heat insulating layer for the straight pipe, but is not shown in the following for easy understanding.

FIG. 9 is a view for explaining a procedure for manufacturing a bent pipe joint elbow. As shown in FIG. 9B, in the case of a bent pipe joint elbow bent at 90 degrees, there is a standard based on JIS or the like for the end portion, but there is no standard regarding the accuracy of the curvature radius R of bending. The reason is that when manufacturing a bent pipe joint elbow bent at 90 degrees, FIG.
Support both ends of a straight pipe made of a material as shown in (a),
The central portion is bent by 90 degrees by heating or the like, thereby forming a 90-degree bent portion as shown in FIG. 9B. Thereafter, a straight line portion is cut off from a broken line portion in FIG. 9B to complete a bent pipe joint elbow. At this time, the bent portion must be slightly crushed, and it is difficult to accurately maintain a constant shape due to the bending speed, the pipe temperature, and various other factors.

[0005] As described above, since the outer shape of the target bent pipe joint elbow is not constant, a foamed resin molded product as a heat insulating layer to be mounted on the elbow is easily and inexpensively formed using a single mold. It is difficult to get. Therefore, in general, the foamed resin molded product is formed so that its inner diameter is somewhat larger than the outer shape of the target bent pipe joint elbow,
It is to be formed so that it can be mounted even if there is a difference in the shape of the target bent pipe joint elbow.

[0006]

In this case, there is an inconvenience that the foamed resin molded article having a half-split shape falls off from the target bent pipe joint elbow during the mounting operation. That is, FIG. 10 is a view showing a situation in which a foamed resin molded product having an inner diameter larger than the outer shape is to be mounted on the bent pipe joint elbow. As shown in FIG. 10, when the size of the foamed resin molded product 2 is slightly larger than that of the bent pipe joint elbow 1, the foamed resin molded product 2 falls without staying at the bent pipe joint elbow 1. This seems boring, but in reality the pipes are located near the ceiling, where they work using ladders or steps, and the workers who attach the foamed resin moldings are equally annoyed by this.

As an actual work procedure, the foamed resin molded article 2 is temporarily fixed to the bent pipe joint elbow 1 and an exterior material such as an aluminum glass cloth is wound thereon, whereby the foamed resin molded article 2 is bent. It is fixed to the fitting elbow 1. Therefore, if the foamed resin molded product 2 stays in the bent pipe joint elbow 1 even if the hand is released for a short time, the exterior material can be wound on the foamed resin molded product 2 during that time. However, as shown in FIG. 10, when the bent pipe joint elbow 1 and the foamed resin molded product 2 having different dimensions are used, actually, the outer wall of the bent pipe joint elbow 1 and the inner wall of the foamed resin molded product 2 are different from each other. It is in a state of contact only at two points, and the foamed resin molded product 2 does not stay in the bent pipe joint elbow 1 even for a short time, and it is difficult to complete the work because it falls off.

Further, in order to form a foamed resin molded product to be mounted on a bent pipe joint elbow having a large diameter, a large-sized mold is required, which is costly. Moreover, the dimensions of the bent pipe joint elbow are various, and it is difficult to manufacture a mold for all of these dimensions.

Therefore, when molding a foamed resin molded article, it is shaped into a plurality of shapes (shapes as shown in FIGS. 6 and 7 of the embodiment) by a virtual plane perpendicular to the center line of the bent pipe joint elbow. If it is possible, individual members can be formed by using a small mold instead of a large mold. However, the conventional foamed resin molded product has a shape that entirely covers the bent pipe joint elbow from both sides,
For the first time, it was possible to temporarily fasten to a bent pipe joint elbow. That is, as described above, conventionally, if the outer peripheral dimension of the bent portion of the bent pipe joint elbow and the inner peripheral dimension of the bent portion of the foamed resin molded product do not match, the foamed resin molded product will be located on the outer peripheral portion of the bent pipe joint elbow. Because it is difficult to temporarily fix, by fitting the dimensions of the end of the bent pipe joint elbow whose shape is determined by the standard and the end of the foamed resin molded product, even if the dimensions of the bent part are slightly different In addition, it was possible to temporarily fix the foamed resin molded product to the bent pipe joint elbow as a whole shape. Therefore, when a conventional foamed resin molded product is divided into a plurality of parts and molded, the divided individual members themselves do not have a method of being temporarily fixed to the outer peripheral portion of the bent pipe joint elbow, and refer to FIG. As described above, the mounting operation becomes extremely difficult.

SUMMARY OF THE INVENTION The present invention has been made in such a background, and a foamed resin molded product which can be mounted on a bent pipe joint elbow having an undefined shape can be easily manufactured by using a single mold. An object of the present invention is to provide a heat insulating material for a bent pipe joint that can be used. An object of the present invention is to provide a heat insulating material for a bent pipe joint which can be mounted on a pipe joint elbow having a large diameter at low cost. Furthermore, the present invention
An object of the present invention is to provide a structure that can be easily mounted and has no rattling after mounting.

[0011]

Means for Solving the Problems The heat insulating material for a bent pipe joint according to the present invention is a foamed resin molding as a heat insulating layer in which a maximum value of the shape variation is assumed in order to cope with a bent pipe joint elbow having an irregular shape. For a bent pipe joint elbow smaller than the assumed diameter by molding a product, the foamed resin molded product should be temporarily fixed to the bent pipe joint elbow temporarily by a projection provided on the inner surface of the foamed resin molded product. It is characterized by.

Further, by dividing and molding the foamed resin molded article into a plurality of parts, the cost of the mold can be reduced as compared with the case of molding using one large mold. The reason why the foamed resin molded product can be divided into a plurality of pieces and molded in this way is that each of the divided individual members can be temporarily fixed to the bent pipe joint elbow by the projection. Therefore, dividing the foamed resin molded article into a plurality of pieces without using the projections of the present invention results in a remarkable decrease in working efficiency, and has been difficult to realize.

That is, the present invention includes a heat insulating layer mounted on the outer periphery of the bent pipe joint elbow, and the heat insulating layer can be mounted by sandwiching the bent pipe joint elbow from both sides of a virtual plane including the center line thereof. This is a heat insulating material for a bent pipe joint, which is a foamed resin molded product formed into a shape.

Here, the feature of the present invention is that the diameter of the inner peripheral surface of the foamed resin molded product is set to be slightly larger than the diameter of the outer peripheral surface of the bent pipe joint elbow to be mounted. A plurality of projections are formed on the peripheral surface so as to be in contact with the outer peripheral surface of the elbow at the time of mounting.

The projection is formed so as to be deformed along the outer periphery by pressing the foamed resin molded article against the flex joint elbow when the foamed resin molded article is mounted on the outer periphery of the bent pipe joint elbow.

It is preferable that the projection is formed in a shape protruding in a rod shape on the inner peripheral surface along an imaginary plane perpendicular to the center line of the bent pipe joint elbow.

A plurality of the projections are formed in a substantially uniform shape along the same imaginary plane perpendicular to the center line, and a virtual circumference including the vertices of the projections is an outer peripheral surface of a bent pipe joint elbow to be mounted. It is desirable to set a little smaller.

It is desirable that the foamed resin molded article is formed into a shape divided into a plurality of parts by an imaginary plane perpendicular to the center line of the bent pipe joint elbow.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a view showing a configuration of a heat insulating material for a bent pipe joint according to an embodiment of the present invention. In FIG. 1, straight pipes 5 are welded to both ends of the bent pipe joint elbow 1, respectively. FIG. 2 is a view showing a state where the foamed resin molded product of the embodiment of the present invention is mounted on a bent pipe joint elbow. FIG. 3 is a view showing the shape of a projection provided on the foamed resin molded product of the embodiment of the present invention. FIG. 4 is a view for explaining the principle of temporarily fixing the foamed resin molded product of the present invention to a bent pipe joint elbow. FIG. 5 is a view showing an example of construction of a heat insulating material for a bent pipe joint according to an embodiment of the present invention.
FIG. 6 is a view showing the state of the foamed resin molded product of the embodiment of the present invention divided into two parts. FIG. 7 is a view showing the state of the foamed resin molded product of the embodiment of the present invention divided into four parts. 6 and 7, straight pipes 5 are welded (hatched portions in the drawings) to both ends of the bent pipe joint elbow 1 respectively.

The present invention, as shown in FIG. 1, includes a heat insulating layer attached to the outer periphery of the bent pipe joint elbow 1. The heat insulating layer is formed by moving the bent pipe joint elbow 1 on both sides of an imaginary plane including its center line. This is a heat insulating material for a bent pipe joint, which is a foamed resin molded product 2 formed into a shape that can be sandwiched and mounted.

Here, the feature of the present invention is that, in the foamed resin molded product 2, the diameter of the inner peripheral surface is set slightly larger than the diameter of the outer peripheral surface of the bent pipe joint elbow 1 to be mounted. At the time of installation, the bent pipe joint elbow 1
Are formed where a plurality of projections 3 contacting the outer peripheral surface are formed.

As shown in FIG. 2A, the projections 3 press the foamed resin molded product 2 against the bent pipe joint elbow 1 when the foamed resin molded product 2 is mounted on the outer periphery of the bent pipe joint elbow 1. As a result, it is deformed along its outer periphery, and FIG.
As shown in (b), the foamed resin molded product 2 is held without looseness by the deformed projections 3 between the inner peripheral surface and the outer peripheral surface of the bent pipe joint elbow 1. That is, FIG.
As shown by an arrow in (a), by pressing the foamed resin molded product 2 against the bent pipe joint elbow 1, as shown in FIG. Adhere to the outer periphery. At this time, the central portion of the projection 3 first contacts the outer peripheral portion of the bent pipe joint elbow 1, and the contact portion gradually spreads toward the end while the repulsive force increases.

As shown in FIG. 3, the projection 3 is formed in a rod-like shape on the inner peripheral surface along an imaginary plane perpendicular to the center line of the bent pipe joint elbow 1. Also, the projection 3
A plurality of substantially uniform shapes are formed along the same virtual plane perpendicular to the center line, and the virtual circumference including the apex of the projection 3 is set slightly smaller than the outer peripheral surface of the fitting elbow 1 to be mounted. Is done.

In terms of the shape of the projections 3 from the standpoint of mold production, a mold for producing the foamed resin molded article 2 of the present invention is produced by adding a thin streak-like groove to the conventional mold. be able to. Processing for adding a thin streak-like groove to a conventional mold can be easily performed by, for example, pulling a part of the mold with a metal saw.

As shown in FIGS. 6 and 7, the foamed resin molded article 2 is formed into a plurality of divided shapes by an imaginary plane perpendicular to the center line of the bent pipe joint elbow 1. FIG.
Is an example in which the foamed resin molded product 2 is formed into a shape divided into two by a virtual plane perpendicular to the center line of the bent pipe joint elbow 1.

Next, the principle of temporarily fixing the foamed resin molded article 2 of the present invention to the elbow 1 will be described. As shown by the arrow in FIG. 4, when the protrusion 3 is pressed against the outer peripheral portion of the bent pipe joint elbow 1 while being crushed, a force represented by a vector v1 is generated. The force represented by the vector v1 can be represented as a resultant force of the vectors v2 and v3. At this time, the vector v2 indicates that the outer peripheral portion of the bent pipe joint elbow 1 has two projections 3
Is a force acting to pinch the foamed resin molded product 2
Acts on the outer peripheral portion of the bent pipe joint elbow 1 as a force. Therefore, the foamed resin molded product 2 is temporarily fixed to the outer peripheral portion of the bent pipe joint elbow 1 by the projections 3.

As an actual construction procedure, as shown in FIG. 1, a foamed resin molded product 2 is crimped to the outer peripheral portion of the bent pipe joint elbow 1 from both sides of the bent pipe joint elbow 1. In the present invention,
According to the principle described with reference to FIG. 4, the foamed resin molded product 2 is temporarily fixed to the bent pipe joint elbow 1 by the projections 3. The construction procedure is completed by winding the exterior material 4 from above. An example of construction is shown in FIG. As the exterior material 4, an aluminum glass cloth is used.

Therefore, the foamed resin molded product 2 is placed on the outer peripheral portion of the bent pipe joint elbow 1 only for a short time from when the foamed resin molded product 2 is mounted on the bent pipe joint elbow 1 until the winding of the exterior material 4 is performed. What is necessary is just to be temporarily fixed. further,
After the mounting operation is completed, the protrusion 3 is pressed against the outer peripheral portion of the bent pipe joint elbow 1 and the inner peripheral surface of the foamed resin molded product 2 while maintaining a constant pressure. Can be fixed to the outer peripheral portion of the bent pipe joint elbow 1 without looseness. In FIG. 5, for the sake of simplicity, the illustration is made for convenience as if a space exists between the bent pipe joint elbow 1 and the foamed resin molded product 2. When the exterior member 4 is attached, the projection 3 is almost completely crushed by the pressure, and such a space hardly exists.

As shown in FIG. 6 and FIG. 7, the foamed resin molded article 2 is formed into a plurality of divided shapes by an imaginary plane perpendicular to the center line of the bent pipe joint elbow 1. FIG.
FIG. 7 shows an example of 45-degree division, and FIG. 7 shows an example of 22.5-degree division. By doing so, the manufacturing cost can be reduced as compared with the case where the foamed resin molded product 2 is manufactured using one large mold.

[0030]

As described above, according to the present invention,
A foamed resin molded product that can be mounted on a bent pipe joint elbow whose shape is not determined can be easily manufactured using a single mold. A heat insulating material for a bent pipe joint which can be mounted on a pipe joint elbow having a large diameter at a low price can be realized. Further, the mounting work can be easily performed, and a structure without rattling after mounting can be realized.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a foamed resin molded product according to an embodiment of the present invention.

FIG. 2 is a view showing a state in which the foamed resin molded product of the embodiment of the present invention is mounted on a bent pipe joint elbow.

FIG. 3 is a view showing the shape of a projection provided on a foamed resin molded product according to an embodiment of the present invention.

FIG. 4 is a view for explaining the principle of temporarily fixing the foamed resin molded product of the present invention to a pipe joint elbow.

FIG. 5 is a view showing a working example of a heat insulating material for a bent pipe joint according to an embodiment of the present invention.

FIG. 6 is a view showing a state of a foamed resin molded product according to an embodiment of the present invention divided into two parts.

FIG. 7 is a view showing the state of the foamed resin molded product of the embodiment of the present invention divided into four parts.

FIG. 8 is a view showing a foamed resin molded product attached to a pipe joint elbow.

FIG. 9 is a view for explaining a manufacturing procedure of the pipe joint elbow.

FIG. 10 is a view showing a situation where a heat insulating layer having a size larger than that of the pipe joint elbow is to be mounted on the pipe joint elbow.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fitting elbow 2 Foam resin molded product 3 Projection 4 Exterior material 5 Straight pipe

Claims (5)

[Claims] 1. A heat insulation layer is provided on the outer periphery of a bent pipe joint elbow, and the heat insulation layer is formed in a shape that allows the bent pipe joint elbow to be sandwiched and mounted from both sides of a virtual plane including a center line thereof. In the insulating material for a bent pipe joint which is a foamed resin molded article, the diameter of the inner peripheral surface of the foamed resin molded article is set to be slightly larger than the diameter of the outer peripheral surface of the bent pipe joint elbow to be mounted. A heat insulating material for a bent pipe joint, wherein a plurality of projections are formed on a peripheral surface of the elbow and are in contact with an outer peripheral surface of the elbow at the time of attachment. 2. The projection is formed such that when the foamed resin molded product is mounted on the outer periphery of the bent pipe joint elbow, the foamed resin molded product is deformed along the outer periphery by pressing against the bent pipe joint elbow. The heat insulating material for a bent pipe joint according to claim 1. 3. The heat insulating material for a bent pipe joint according to claim 2, wherein the projection is formed in a shape protruding in a rod shape on the inner peripheral surface along an imaginary plane perpendicular to a center line of the bent pipe joint elbow. 4. A plurality of the protrusions are formed in a substantially uniform shape along the same virtual plane perpendicular to the center line, and a virtual circumference including the protrusion apex thereof is formed by a bent pipe joint elbow to be mounted. The heat insulating material for a bent pipe joint according to claim 3, wherein the heat insulating material is set slightly smaller than the outer peripheral surface. 5. The heat insulating material for a bent pipe joint according to claim 2, wherein the foamed resin molded article is formed into a shape divided into a plurality of parts by an imaginary plane perpendicular to the center line of the bent pipe joint elbow.