JP3314059B2 - Cooling piping cover - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling pipe cover for covering a pipe through which a low-temperature fluid flows with a hard urethane foam.

[0002]

2. Description of the Related Art A conventional cooling insulation pipe cover is shown in FIG.
As shown in the figure, it is formed in a cylindrical shape along the circumference of the pipe 1,
Hard urethane foam 4 divided in the circumferential direction and the length direction
Is attached to the pipe 1 in a state where the joints 6 forming the joints 7 are brought close to each other. As shown in FIGS. A glass wool 8B is interposed as a stretchable cold insulator 8, and in-situ urethane foam is injected from above, and the outside of the cold insulator 8 is filled with a urethane in-situ foam 9, and the moisture-proof film 11 And the outer periphery thereof was covered with an exterior plate 3. Note that the rigid urethane foam 4 used is one in which a moisture-proof film 11 is adhered to the outer peripheral surface 5 and integrally coated. In general, the rigid urethane foam 4 is bonded to the outer peripheral surface of the pipe 1.

[0003]

However, in the construction of the conventional cooling pipe cover, there is a problem that the thermal expansion coefficient of the rigid urethane foam 4 is larger than that of steel. That is, since the thermal expansion coefficient of the rigid urethane foam 4 is large, the deformation due to the temperature difference of the pipe 1 is caused by a large temperature difference between when the cold insulation is performed and when the ultra-low temperature fluid flows through the pipe 1. The amount of deformation several times the amount is brought to the rigid urethane foam 4. For this reason, the rigid urethane foam 4 is connected to the pipe 1
If the hard urethane foam 4 is adhered to the hard urethane foam 4, a large tensile strain may be generated on the bonding surface of the hard urethane foam 4, that is, the inner surface, and the hard urethane foam 4 may sometimes be damaged. In particular, in order to protect the joints 7 from damage, glass wool 8B is filled as the inflatable cold insulator 8 and in-situ urethane foam is injected from the outside to form urethane in-situ foams 9. There is a problem that management is required, high technology is required, and labor and labor are required. In addition, the glass wool 8B filled as the cold insulator has a problem that the heat insulating property is not stable and the heat insulating property in the joint portion 7 is not stable.

Further, when the pipe is a large-diameter pipe, the divided pipe cover is formed of two layers of inner and outer hard urethane foams in order to reduce a problem due to a temperature difference between the inside and the outside of the cooling pipe cover. Although it is also possible to adopt a two-layer structure, by interposing a hard urethane foam at an intermediate temperature between the exterior material, the stress based on the above-described temperature difference can be reduced, but each joint portion has There is also a problem that it is not easy to inject the urethane foam in-situ into the joints on the inside, and there is also a problem that it is troublesome and labor-intensive to interpose the cold insulator in the gap. I have.

Further, a moisture-proof film 11 is previously adhered to the outer surface of the hard urethane foam 4 to suppress the deterioration of the hard urethane foam 4 and the deterioration of the heat insulation performance. Is very thin and cannot not only protect the rigid urethane foam 4 from damage, but also is susceptible to damage by itself and requires attention during construction, so there is a problem with workability. In order to protect the pipe cover from damage, there is also a problem with respect to the amount of work required to cover the outside with the exterior plate 3. In addition, in order to cover the exterior plate 3 on the outside of the moisture-proof film 11 that is easily damaged, it is necessary to carefully perform the covering operation, and there is a problem that the construction of the exterior plate 3 requires labor and labor.

Therefore, an object of the present invention is to provide a pipe cover for cold insulation so as to maintain a sufficient heat insulating property without requiring much labor for cold insulation work and suppressing damage to the rigid urethane foam. Is to do.

[0007]

[Means for Solving the Problems]

[Characteristics of the present invention] The cooling insulation pipe cover according to the present invention is characterized in that a rigid urethane foam is integrated with an exterior material, and that joints have a degree of freedom of thermal deformation. , Each having the following configuration features.

According to a first feature of the cooling insulation pipe cover according to the present invention, as described in claim 1, the rigid urethane foam is formed in a cylindrical shape along the circumference of the pipe, and the cylindrical shape is formed in a circumferential direction. And dividing the hard urethane foam on the outer peripheral surface of the hard urethane foam, covering an outer plate capable of preventing the surface of the hard urethane foam from being lost, and integrally forming a divided pipe cover, In a state where the pipe cover is attached to the pipe, a gap is formed between the edge parts of the exterior plate located at the joint part of the hard urethane foam between the adjacent divided pipe covers, respectively, The split pipe cover is configured to be freely attached to the pipe.

A second aspect of the cold storage pipe cover according to the present invention is the above-mentioned first aspect, wherein the split pipe cover of the first aspect is attached to the pipe.
The present invention is characterized in that a stretchable cold insulator is arranged at the joint of the rigid urethane foam between the adjacent divided pipe covers.

[Function and Effect of Characteristic Configuration] In addition to preventing damage to the pipe cover for divided cold insulation on the pipe, it is easy to install the pipe on the pipe, and the thermal insulation property of the joints is improved. The operation and effects required for each characteristic configuration are as follows.

That is, according to the first characteristic configuration of the cooling insulation pipe cover according to the present invention, the hard urethane foam is formed in a cylindrical shape along the circumference of the pipe, and is formed in the circumferential direction and the length direction. Since it is divided, and is formed integrally with the outer peripheral surface by covering the outer peripheral surface, the outer peripheral plate also serves as a moisture-proof function of the rigid urethane foam, and at the same time, when mounting to a pipe, The outer peripheral surface of the rigid urethane foam is protected, and there is no possibility of damaging the outer peripheral surface, so that it is easy to mount and, at the same time, it is not necessary to attach the outer plate later, so that when performing cold insulation work,
Damage to the rigid urethane foam can be greatly reduced. Moreover, in a state where the divided pipe cover is attached to the pipe, a gap is formed between the edge portions of the outer plate adjacent to each other at the joint portion, so that the rigid urethane foam is Even if the heat shrinkage is larger than the heat shrinkage of the exterior plate, the edge portions can be prevented from coming into contact with each other and interfering with each other, and therefore, the exterior plate is peeled off from the outer peripheral surface of the hard urethane foam. Alternatively, it is possible to prevent peeling of the bonded portion of the rigid urethane foam. Therefore, the work of attaching the rigid urethane foam to the pipe becomes easy and labor saving, and the rigid urethane foam can be prevented from being damaged just by attaching.

[0013] The second embodiment of the cooling insulation pipe cover according to the present invention.
According to the characteristic configuration, it is possible to improve the heat insulating property at the joint while achieving the operation and effect of the first characteristic configuration. In other words, the elastic insulator is elastically deformed by arranging the stretchable cold insulator at the joints, and the joints are separated from each other to distribute heat even when deformed due to a temperature change. It is possible to prevent the formation of the resulting gap and to stabilize the heat insulating performance of the cold insulator at the joint.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a cooling pipe cover according to an embodiment of the present invention. FIG. 1 is a partially cutaway perspective view of a pipe provided with a cooling insulation pipe cover according to the present invention, FIG. 2 is a cross-sectional view thereof, and FIG. 3 is a perspective view illustrating the configuration of a divided pipe cover. , FIG. 4 is a cross-sectional view of a main part for explaining the joint, FIG. 5 is a vertical cross-sectional view for explaining a vertical connecting portion of a divided pipe cover at a specific location, and FIG. It is a perspective view which shows assembly of a vertical connection part. 9 to 11 used in the above-described conventional technology are denoted by the same reference numerals as those shown in FIGS. 9 to 11 or those having the same functions. And a part of the detailed description is omitted.

As shown in FIGS. 1 and 2, a divided pipe cover 2 which is divided into two in the circumferential direction is put on and joined so as to sandwich the pipe 1, thereby forming a cooling insulation pipe cover. The illustrated example is an example for a small-diameter pipe. The split pipe cover 2
As shown in the figure, the cylindrical shape is divided into two parts in the radial direction and is divided into appropriate dimensions in the length direction. That is, a cylindrical hard urethane foam 4 formed to have a predetermined length and having an inner diameter close to the outer diameter of the pipe 1 is divided into two parts on the diameter, and the outer periphery of the hard urethane foam 4 is divided into two parts. The exterior plate 3 made of a thin steel plate whose surface can be prevented from being lost is bonded and integrally formed, and formed on the divided pipe cover 2. Thus, the exterior plate 3 is made of a rigid urethane foam 4
In this way, the exterior plate 3 can prevent the moisture absorption of the rigid urethane foam 4 as in the case of the conventional moisture-proof film, and can prevent the deterioration and deterioration of the heat insulation performance. As shown in FIG. 3, the outer plate 3 is configured such that the lengths in the circumferential direction and the length direction are slightly shorter than the lengths of the hard urethane foam 4 in the circumferential direction and the length direction, respectively. The circumferential edge 3a and the longitudinal edge 3a of the exterior plate 3 are
A gap is formed between them. Since this gap accompanies a large temperature drop between the time of construction and the time of use, the shrinkage allowance of the hard urethane foam 4 becomes larger than the shrinkage allowance of the exterior plate 3, and the edge portions 3a contact each other. This avoids interfering with each other and causing deformation such as peeling from the hard urethane foam 4 on the exterior plate 3.

As shown in FIG. 3, the hard urethane foam 4 forming the divided pipe cover 2, which is covered opposite to the pipe 1, has a contact surface 6 which is long on the inner diameter side as shown in FIG. 3. A melamine foam layer 8A in which a melamine resin is foamed is arranged in the recess 6a, and the cold insulating material 8 is adhered to the recess 6a so that the cold insulator 8 is joined to the joint 7. (See FIG. 2). As this adhesive, a urethane-based adhesive is preferably used. Also,
As shown in FIG. 4, a hard urethane foam 4 forming the divided pipe cover 2, which is covered adjacently in the length direction of the pipe 1, has a contactable joint surface 6 on the inner diameter side. The recess 6a is formed along the direction, and the melamine foam layer 8A as the heat insulating material 8 is arranged and bonded to the recess 6a. A chamfered portion 5a is formed between the joint surface 6 and the outer peripheral surface 5 by chamfering the outer end of the joint surface 6 toward the edge 3a of the exterior plate 3. These eyes ground 6
The joints 7 are formed by bringing them into contact with each other and bonding them.

The joints 6 are adhered to each other. However, if they are adhered with a soft foamable adhesive material that can be elastically expanded and contracted, it is convenient because the relative displacement between the divided pipe covers 2 can be absorbed. And, in the recess formed by the chamfered portion 5a,
The caulking material 13 is filled, and the moisture-proof tape 10 is attached from above the exterior plate 3. The moisture-proof tape 10 prevents the heat insulating material from absorbing moisture and deteriorating, or preventing the heat insulating performance from deteriorating. As the caulking material 13,
A silicone caulking material is preferably used.

With the above construction, when the ultra-low temperature fluid is circulated in the pipe 1 and the pipe 1 and the divided pipe cover 2 contract, the shrinkage is smaller than that of the hard urethane foam 4. The edge portions 3a of the exterior plate 3 are prevented from approaching and coming into contact with each other. The hard urethane foam 4 has a glass net 12 interposed between the rigid urethane foam 4 and the pipe 1 and does not adhere to the pipe 1. The layer of the glass net 12 enlarges the temperature difference between the surface of the pipe 1 and the hard urethane foam 4, and due to the difference in thermal expansion coefficient between the two, the pipe 1 is hardened by the hard urethane foam. 4 is prevented from acting to expand the diameter.

The joint surfaces 6 of the rigid urethane foam 4 of the divided pipe cover 2 adjacent in the longitudinal direction of the pipe 1 are bonded to each other. For this bonding, for example, a urethane-based adhesive is used. A moisture-proof tape 10 is also attached to the joint 7 over the entire circumference of the outer circumferential surface. This moisture-proof tape 10
This also performs the same function as the moisture-proof tape 10 attached from above the caulking material 13 filled in the joint 7. In the case where the heat-insulating work distance of the pipe 1 is long, the melamine foam layer 8A is interposed between the joints 6 at joints 7 everywhere, for example, as shown in FIGS. The melamine foam layer 8A is adhered to the joints 6 on both sides. The joint 7 is also covered with the moisture-proof tape 10 over the edge 3a of the exterior plate 3 on both sides of the melamine foam layer 8A. In this way, even if the temperature is lowered after the heat-insulating work, the divided pipe cover 2 is shorter than the pipe 1, and a gap is generated between the divided pipe covers 2 arranged in the length direction of the pipe 1. In other words, the cooling capacity is prevented from being reduced.

A divided pipe cover 2 is formed by dividing the pipe into two parts in the circumferential direction. The pipe cover has a dimension at room temperature, a length in the pipe length direction is 930 mm, and a thickness of the rigid urethane foam 4 is 150 m.
m, an example of the cooling insulation pipe cover will be described.
Is formed of a color iron plate, and adheres to the outer peripheral surface of the hard urethane foam 4 by self-adhesion when the uncured urethane resin forming the hard urethane foam 4 is foamed. The exterior plate 3 has an edge 3a of 8 mm in the length direction from the edge of the outer peripheral surface 5 of the rigid urethane foam 4 in the length direction, so that the distance between the edges 3a on both sides adjacent in the length direction is reduced. 16
mm. Further, in the circumferential direction, each of the chamfered portions 5a of a 1/2 taper surface is formed by cutting 5 mm of the outer peripheral surface 5 side edge of the joint surface 6 facing the circumferential direction of the hard urethane foam 4 by 5 mm. It is formed so as to coincide with the edge 3a of the exterior plate 3. 75 m along the inner peripheral edge on each joint surface 6
A recess 6a having a width of 15 m and a depth of 15 mm is formed.
By attaching the melamine foam layer 8A having a thickness of 8 mm, the heat insulating material 8 is placed in the joint 7 in advance. further,
The glass net 12 is adhered to the inner peripheral surface by self-adhesion when the uncured urethane resin forming the hard urethane foam 4 foams. The melamine foam layer 8A is bonded to the recess 6a of the hard urethane foam 4 using a foamable melamine-based adhesive.

The divided pipe cover 2 formed in this way is
The joints 6 are put on the pipe 1 and the joints 6 facing each other are adhered to each other with a foaming urethane adhesive to form joints 7 in the vertical direction. At this time, the melamine foam layers 8A also adhere to each other. The vertical V-shaped groove formed between the chamfered portions 5a is filled with a silicone-based caulking material 13, and a moisture-proof tape 10 having a width covering the edge 3a of the exterior plate 3 on both sides is filled. The joint part 7 is covered by being put on and pasted. Next, the rigid urethane foams 4 are also bonded to each other between the divided pipe covers 2 adjacent to each other in the longitudinal direction of the pipe 1 with a foamable urethane-based adhesive, and a silicone-based urethane foam is provided between the edge portions 3 a of the exterior plate 3. The caulking material 12 is filled over the entire circumference, and the moisture-proof tape 10 is covered over the entire circumference, and is adhered to the exterior plate 3 to perform the cold insulation work.
During this time, the divided pipe cover 2 covers the outer peripheral surface 5 of the rigid urethane foam 4 with the exterior plate 3, so that the outer peripheral surface 5 can be prevented from being damaged, and handling during construction is easy. Moreover, if the moisture-proof tape 10 is adhered in the above-described procedure, the hard urethane foam 4 can be reliably protected from moisture, so that a cooling insulation pipe cover having stable heat insulating properties can be mounted.

[Another Embodiment] An embodiment of a cooling insulation pipe cover according to the present invention not shown in the above embodiment will be described below.

<1> In the above-described embodiment, an example has been described in which the cooling pipe cover is formed by covering the divided pipe cover 2 divided in two in the circumferential direction so as to sandwich the pipe 1. The number of divisions to form the divided pipe cover 2 by division is arbitrary, and the number of divisions does not matter whether it is divided into three or four. In addition, the pipe 1
The number of divisions in the length direction may be set to a length suitable for workability and the like. Further, the divided pipe cover 2 may be further divided in a radial direction.

<2> In the above embodiment, the pipe 1
A description will be given of an example in which a concave portion 6a is formed along the length direction on the inner diameter side in the joint surface 6 of the hard urethane foam 4 which is covered in opposition to the other and which can contact each other, and the melamine foam layer 8A is arranged. However, a layer of the elastic material 8 that can be elastically expanded and contracted may be disposed on the entire surface of the joint surface 6 without forming the concave portion 6a.

<3> In the above embodiment, the pipe 1
A description will be given of an example in which a concave portion 6a is formed along the length direction on the inner diameter side in the joint surface 6 of the hard urethane foam 4 which is covered in opposition to the other and which can contact each other, and the melamine foam layer 8A is arranged. However, the concave portion 6a may be filled with glass wool instead of the melamine foam layer 8A.

<4> In the above embodiment, the pipe 1
A description will be given of an example in which a concave portion 6a is formed along the length direction on the inner diameter side in the joint surface 6 of the hard urethane foam 4 which is covered in opposition to the other and which can contact each other, and the melamine foam layer 8A is arranged. However, for example, as shown in FIG. 7, the joint 7 is formed in an ijakuri shape, and only the joint 6 of the rigid urethane foam 4 at the joint 7 of the one divided pipe cover 2 is provided on the inner peripheral side. The recess 6a may be formed, and the cold insulator 8 may be disposed in the recess 6a. If formed in this way, even if the joints 6 are separated from each other, a gap penetrating through the joint 7 is not formed, and the heat insulation performance can be maintained, and at the same time, one joint 6 only in the recess 6a.
Can be saved, which saves man-hours.
The other surface of the cold insulator 8 may be adhered to the joint surface 6 of the other rigid urethane foam 4. Further, as shown in the drawing, a cold insulator 8 may be bonded to a recessed portion 6a formed on the outer peripheral side of the joint surface 6 of the other hard urethane foam 4 as well.

<5> In the above embodiment, the pipe 1
The example in which the chamfered portion 5a in which the outer end of the joint surface 6 is chamfered is formed between the jointable portion 7 and the outer peripheral surface 5 of the hard urethane foam 4 which are covered so as to face each other. However, for example, the chamfered portion 5a may be a R-chamfered portion, and as shown in FIG. 7, a groove is formed in the joint portion 7 with the hard urethane foams 4 on both sides in contact with each other. The step 5b may be formed as if it were formed.

<6> In the above embodiment, the pipe 1
Urethane foam 4 covered adjacently in the longitudinal direction
The example in which the recess 6a is formed along the circumferential direction on the inner diameter side and the melamine foam layer 8A is arranged on the ground 6 that can contact each other, but without forming the recess 6a, A layer of an elastically stretchable cold insulation material 8 may be adhered and arranged on the entire surface of the joint surface 6. The cold insulator 8 may be the above-mentioned melamine foam layer 8A, or may be another cold insulator such as foamed polyethylene.

<7> In the above embodiment, the pipe 1
Urethane foam 4 covered adjacently in the longitudinal direction
The example in which the recessed portion 6a is formed along the circumferential direction on the inner diameter side in the joint portion 7 that can contact each other and the melamine foam layer 8A is arranged, for example, as shown in FIG. The recess 7a is formed on the inner peripheral side only of the rigid urethane foam 4 at the joint 7 of the split pipe cover 2 and the annular recess 6a is kept cool. The rigid urethane foam 4 at the joint 7 of the other divided pipe cover 2 is formed with a protrusion 6b at a position facing the recess 6a, and the annular protrusion 6b May be inserted into the annular recess 6a. If formed in this way, even if the joints 7 are separated from each other, a gap penetrating in the radial direction is not formed between the joints 7, and at the same time heat insulation performance can be maintained, Since the cooling material 8 only needs to be attached to only one of the joints in advance, the number of construction steps of the joint 7 can be reduced. The other surface of the cold insulator 8 may be bonded to the other rigid urethane foam 4.

<8> In the above embodiment, the rigid urethane foam 4 is provided between the pipe 1 and the glass net 1.
Although it has been described that the reinforcing member 2 is interposed and is not bonded to the pipe 1, a reinforcing material such as a glass nonwoven fabric or a glass yarn that can suppress an increase in diameter may be interposed instead of the glass net 12. Good.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing an example of a cooling insulation pipe cover according to the present invention.

FIG. 2 is a cross-sectional view of the cooling insulation pipe cover shown in FIG. 1;

FIG. 3 is a perspective view for explaining the configuration of a divided piping cover.

FIG. 4 is a cross-sectional view of a main part of the divided pipe cover shown in FIG. 3;

FIG. 5 is a longitudinal sectional view of an essential part of an example of a cooling insulation pipe cover attached to a pipe.

FIG. 6 is an exploded perspective view illustrating mounting of the cooling insulation pipe cover shown in FIG. 5 on the pipe.

FIG. 7 is a cross-sectional view of a main part of another example of the cooling insulation pipe cover according to the present invention.

FIG. 8 is a longitudinal sectional view of a main part of another example of the cooling insulation pipe cover according to the present invention.

FIG. 9 is a partially cutaway perspective view showing an example of a conventional cooling pipe cover.

FIG. 10 is a cross-sectional view of the cooling insulation pipe cover shown in FIG. 9;

FIG. 11 is a longitudinal sectional view of the cooling insulation pipe cover shown in FIG. 9;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Piping 2 Divided piping cover 3 Exterior plate 3a Edge of exterior plate 4 Hard urethane foam 7 Joint of divided piping cover 8 Cold insulator

Continuation of the front page (56) References JP-A-9-60791 (JP, A) JP-A-11-13988 (JP, A) JP-A-7-280172 (JP, A) JP-A-62-124396 (JP) , U) Japanese Utility Model 7-10695 (JP, U) Japanese Utility Model 59-83269 (JP, U) Japanese Utility Model 7-42898 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB) Name) F16L 59/00-59/22

Claims (2)

(57) [Claims] 1. A cooling insulation pipe cover surrounding a pipe through which a low-temperature fluid flows with a hard urethane foam, wherein the hard urethane foam is formed in a cylindrical shape along the circumference of the pipe. At the same time, the outer pipe of the hard urethane foam which is divided in the circumferential direction and the length direction of the cylindrical shape and which is capable of preventing the surface of the hard urethane foam from being deficient is attached to a divided pipe cover. Integrally formed, in a state where the divided pipe cover is attached to the pipe, between the edge portions of the exterior plate located at the joint of the hard urethane foam between adjacent divided pipe covers, A cooling insulation pipe cover in which a gap is formed and the divided pipe cover is configured to be freely attached to the pipe. 2. A stretchable cold insulation material is arranged at joints of the rigid urethane foam between adjacent divided pipe covers when the divided pipe cover is attached to the pipe. Cooling piping cover.