JPH11153261A - Heat insulation support device for piping - Google Patents

Abstract

PROBLEM TO BE SOLVED: To compatibly provide excellent rigidity and a heat insulation property. SOLUTION: A heat insulation support device for piping 10 is provided with a heat insulation support body 11 comprising heat insulation split pieces 11a, 11b which are provided so as to surround a part to be supported of a pipe P, and split into a plurality of parts in the circumferential direction of the pipe P. The heat insulation split pieces 11a, 11b of hollow structure are provided with an inner circumferential wall 20, an outer circumferential wall 21 on the outer side thereof, connection walls 22, 23 provided on opposite parts of the heat insulation split pieces 11a, 11b, and an internal space 26 to be surrounded by end walls 24, 25. Semi-cylindrical grip auxiliary projecting parts 27, 28 are integratedly formed on each end part of the heat insulation split pieces 11a, 11b. The wall thickness of the heat insulation split pieces 11a, 11b is >=1/10 to <=1/3 of the thickness of the support body in the radial direction of the heat insulation support body 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat insulating support device for a pipe for supporting a pipe for transferring a low-temperature or high-temperature fluid, for example.

[0002]

2. Description of the Related Art In various plant facilities and the like, a heat insulating support device is used to support a pipe for transferring a low-temperature or high-temperature fluid to a fixed structure such as a building. A conventional heat-insulating support device is mainly composed of a heat-insulating support block made of a molded product of a cast foam typified by rigid urethane foam, and the outside of the heat-insulating support block is constrained by a support bracket such as a hanging bracket or a pillow bracket. Was adopted.

[0003] The heat insulating support block made of the foam is
A divided structure divided into a plurality of pipes in the circumferential direction of the pipe is adopted, and these divided pieces are provided so as to surround the pipe at the construction site, and then the supporting bracket is wound around the heat insulating support block and tightened with bolts. Such work is being performed.

[0004]

The above-mentioned heat-insulating support block is inferior in terms of heat-insulating performance and rigidity to piping load.
Hard foamed resins such as hard urethanes (especially nullate foams) have been recommended. However, since the rigid foamed resin itself has poor toughness, corners and the like are likely to be chipped if the handling is poor. For this reason, there is no functional problem, but the appearance of the heat-insulating support block may deteriorate, or the construction site may be stained with resin dust. Moreover, since hard foamed resin such as hard urethane is a thermosetting resin, it is difficult to reuse (recycle) the heat insulating support block at the current technical level.

It is known that the rigidity of a conventional heat-insulating support block made of hard urethane foam is inversely proportional to the rigidity corresponding to its density and the heat insulating property. Regarding the rigidity of the heat insulating support block, there is a synthetic resin support receiving standard (density: 300 kg / m ³ , compressive strength: 45 kgf / cm ² or more) based on JIS A9514. In contrast, there is no clear standard for heat insulation. For this reason, rigidity had to be given priority. For example, a density of 0.45 g /
In the case of a hard foamed urethane of cm ³ , the compressive strength satisfies the above-mentioned standard, but is inferior in heat insulation. Conversely, in the case of hard foamed urethane having densities of 0.15 and 0.25 g / cm ³ , the heat insulation properties are good, but the compressive strength cannot satisfy the above-mentioned standard.

[0006] Under these circumstances, the heat insulation is sacrificed.
At present, it is not possible to produce a heat-insulating support block that is superior to heat insulation at a density (300 kg / m ³ ) that satisfies the minimum rigidity. As a result, only a half-way rigid heat-insulating support block can be obtained. There was no problem.

Further, the heat insulating support block made of hard urethane foam has poor vibration absorption because the material itself is hard and brittle. Therefore, vibration of a pump or the like for transferring a fluid such as hot water into the pipe causes the pipe or the heat insulating support block to be vibrated. May propagate to the room via In order to address this problem, for example, in the case of an installation-type heat-insulating support block, a cushioning material is provided between the heat-insulating support block and the floor, and in the case of a suspension-type heat-insulating support block, the cushioning material is provided between the heat-insulating support block and the floor. Although a cushioning material is provided between the pipes or between the pipe and the heat insulating support block, the cost required for the construction and the cost for the cushioning material are high.

Further, the gripping force of the heat insulating support block made of hard urethane foam with respect to the pipe decreases with time, so that the pipe and the heat insulating support block may move relative to each other (displacement) in the axial direction. In this case, a gap is generated between the heat insulating material covering the portion of the pipe other than the heat insulating support block and the heat insulating support block, and a problem arises in that a part of the pipe is exposed and the heat insulating property is reduced. Accordingly, an object of the present invention is to provide a heat insulating support device for piping that can achieve both heat insulating performance and rigidity, which are the two most important characteristics as a heat insulating support device.

[0009]

According to a first aspect of the present invention, there is provided an adiabatic split piece provided at a position to be supported on a pipe and divided into a plurality of pieces in a circumferential direction of the pipe. A heat insulating support device for pipes having a heat insulating support made of: wherein the heat insulating split pieces are made of a thermoplastic resin, and are provided on the inner peripheral wall surrounding the pipe, the outer peripheral wall thereof, and the opposing portions of the heat insulating split pieces. A hollow structure having an internal space surrounded by the connecting wall and the end walls positioned at both ends in the axial direction, and the thickness of the heat-insulating split piece is set to 1 / th of the thickness of the radial support of the heat-insulating split piece. It is characterized by being not less than 10 and not more than 1/3.

Examples of the thermoplastic resin include olefin-based resins such as LDPE (low-density polyethylene), HDPE (high-density polyethylene), PP (polypropylene), and TPX (trimethylpentene).
Thermoplastic resins such as S, PET (polyethylene terephthalate), modified PPO (noryl), PC (polycarbonate), PBT (polybutylene terephthalate), P
Non-halogen engineering plastics such as A (polyamide) are recommended.

It has been found that when the thickness of the hollow heat-insulating support made of a thermoplastic resin is in the following range, "both rigidity and heat insulation can be achieved". That is, when the thickness ratio (thickness / support thickness) is less than 1/10, the mass of the heat-insulating support becomes small, so that not only the rigidity becomes too small, but also the heat capacity (product of specific heat and weight) becomes small. For this reason, the inner peripheral wall of the heat insulating support is affected by the temperature of the heat medium inside the pipe, and convection is activated, so that a predetermined heat insulating property cannot be obtained. On the other hand, when the thickness ratio exceeds 1/3, the heat capacity increases due to an increase in the mass of the heat insulating support.
The volume of the internal space of the heat-insulating support becomes too small, and a predetermined heat-insulating property cannot be obtained.

When the thickness ratio is in the range of 1/10 to 1/3, a heat insulating space having an appropriate size exists inside the heat insulating support, and furthermore, the convection is small and the heat capacity is moderate. And good heat insulation properties are exhibited,
Since the thickness can be increased, sufficient rigidity that satisfies the standard can be obtained.

According to a second aspect of the present invention, if the grip assisting convex portion is integrally provided on the end wall of the heat insulating divided piece,
Since the grip assisting convex portion elastically adheres to the pipe and grips the pipe by its tightness, a vibration absorbing action can be obtained.

In a preferred embodiment, a recess is formed on the inner peripheral wall of the heat-insulating segment to form a gap between the inner peripheral wall and the outer peripheral surface of the pipe, so that the recess functions as an inner heat-insulating space. You may make it. in this case,
A heat insulating support having a pseudo composite hollow structure is obtained. In this simulated composite hollow body structure, although there is internal convection, the heat source is considerably shut off as in the case of the independent composite hollow body structure described above, and the secondary heat source temperature on the inner peripheral wall of the heat-insulating split piece approaches the ambient temperature, The outer peripheral wall is hardly affected by the heat source.

As described in claim 4, when the heat insulating material is accommodated in the concave portion, the heat insulating performance is further improved. When a heat insulating material is present in this groove, convection and radiation in the concave portion in the pseudo-composite hollow body structure are drastically reduced, the secondary heat source temperature becomes equal to the ambient temperature, and convection hardly occurs in the internal space of the heat insulating divided piece. . As a result, heat insulation performance equal to or higher than that of the conventional heat-insulating support made of rigid urethane foam can be exhibited.

Further, as described in claim 5, by containing a heat insulating material in the internal space of the heat insulating divided piece, convection and radiation in the internal space of the heat insulating divided piece can be suppressed. As described in claim 6, it is recommended that a heat-insulating split piece made of a thermoplastic synthetic resin be molded by blow molding. To the material selected from the thermoplastic resins mentioned above,
For example, using a parison made of a raw material to which an inorganic flame retardant such as phosphorus-based or aluminum hydroxide or magnesium hydroxide is added, and an appropriate coloring agent and an inorganic filler (extending material) are added, by a usual blow molding technique, A desired shape of the heat-insulating split piece is obtained. The blow molding may be not only ordinary extrusion blow molding or injection blow molding but also special blow molding.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to a heat insulating and supporting apparatus 10 for piping shown in FIGS. As shown in FIGS. 1 and 3, the heat insulating support device 10 for a pipe is provided so as to surround a portion to be supported of the pipe P. Other portions of the pipe P are covered with the heat insulating material Q and the moisture-proof layer. This heat insulating support device 10
Is a pair of heat-insulated split pieces 11 divided in the circumferential direction of the pipe P.
a heat insulating support 11 composed of a and 11b. The number of divisions of the heat insulating support 11 is not limited to this embodiment, and may be divided into three or more.

The configuration of the pair of heat-insulating split pieces 11a and 11b is substantially common to each other, and each has a hollow structure. That is, the inner peripheral wall 20 having a shape surrounding the pipe P
And an outer peripheral wall 21 on the outside thereof, and heat-insulated split pieces 11a, 11
b Connection walls 22 and 23 provided at mutually opposing portions (joining surfaces)
And end walls 24 located at both ends in the axial direction (tube axis direction).
25. And these walls 20,21,2
It has an internal space (insulated space) 26 surrounded by 2, 23, 24, 25. By exhausting the air in the internal space 26 and approaching the vacuum, convection may be suppressed and the heat insulating effect may be further enhanced.

Semi-cylindrical grip assisting projections 27 and 28 are formed integrally with the end walls 24 and 25 at portions of the end walls 24 and 25 surrounding the pipe P. These grip assist projections 27,
The inner diameter D ₁ on the distal end side of the inner peripheral surface of 28 is smaller than the inner diameter D ₂ of the inner peripheral surface of the supporting body excluding the grip auxiliary protrusions 27 and 28. Grip the auxiliary protrusions 27 and 28, so that among the inner diameter D ₁ of the circumferential surface of the distal end side is smaller than the outer diameter of the pipe P,
It projects from the end walls 24 and 25 in a tapered shape in the axial direction of the pipe P. Thereby, the tightening margin of the grip auxiliary protrusions 27 and 28 to the pipe P can be obtained.

The material of the heat-insulating split pieces 11a and 11b is, for example, a thermoplastic resin such as PP to which a flame retardant, a coloring agent, an inorganic filler and the like are added as required. A parison having a thickness of about 3 mm made of this material is housed in a blow molding mold, and gas is blown into the parison to form the desired heat-insulated split pieces 11a and 11b.

Usually, air is used as the above gas.
In consideration of the heat insulating property, carbon dioxide, which is a good heat insulating gas, may be used. HDP is used as a material other than PP.
E, LDPE, PA, TPX, ABS, P
An appropriate thermoplastic resin such as ET, modified PPO, PC, and PBT can also be used. In addition, these heat insulation division pieces 1
1a and 11b may be formed by injection molding instead of blow molding.

Inner peripheral wall 20 of heat-insulating split pieces 11a, 11b
A concave portion 3 which forms an adiabatic space with the outer peripheral surface of the pipe P
0 is provided so as to be continuous over the entire circumference of the pipe P. A heat insulating material 31 (shown in FIG. 3) is accommodated in the concave portion 30. The heat insulating material 31 is, for example, a foamed plastic such as a closed-cell olefin foam, and is provided so as to surround the entire circumference of the pipe P. The heat insulating material 31 is fixed to the inner peripheral wall 20 by an appropriate fixing member 32 such as an olefin-based adhesive tape or ultrasonic welding in consideration of recyclability.

On the outer peripheral wall 21 of each of the heat-insulating split pieces 11a and 11b, a groove 36 having a shape into which a support fitting 35 such as a suspension band can be fitted is provided so as to be continuous over the entire circumference of each of the heat-insulating split pieces 11a and 11b. Have been. A support fitting 35 as illustrated in FIG. 2 is fitted into the groove 36.

Although the shape and structure of the support bracket 35 are not limited to the illustrated example, the support bracket 35 in the illustrated example is formed by connecting a pair of left and right clamp pieces 35a and 35b to be openable and closable by a hinge 35c. Insulated split pieces 11a, 1
1b, the clamp pieces 35a, 35b are closed,
The piping P is connected by connecting members 37 (shown in FIG. 4) such as bolts.
Is clamped in the direction of clamping, so that the heat-insulating split pieces 11a and 11b are fixed to a support structure such as a building (not shown) via the support fitting 35 and the connecting member 38 and the like.

On the outer surface side of the outer peripheral wall 21, a projection 4 for temporary fixing is provided.
0 is formed integrally with the outer peripheral wall 21. This projection 40
Is formed in a position and a shape that can be fitted in the hole 41 formed in the support fitting 35, and by temporarily fitting the projection 40 into the hole 41, the heat insulating split pieces 11 a and 11 b are temporarily fixed to the support fitting 35. It is possible to maintain the temporarily fixed state of both from the factory shipment stage to the construction site. Since these heat-insulating split pieces 11a and 11b are made of a thermoplastic synthetic resin, the temporary fixing projections 40 have appropriate toughness, and the projections 40 have sufficient strength to temporarily fix the support fitting 35. be able to.

A projection 45 is provided on one of the opposing connecting walls 22, 23 of each of the heat-insulating split pieces 11a, 11b.
On the other hand, a concave portion 46 is provided. As shown in FIG.
The convex portion 45 has a tapered shape such that the width becomes slightly narrower toward the distal end side. The concave portion 46 also has a tapered shape such that the width on the back side is reduced. In addition, the height of the convex portion 45 is slightly smaller than the depth of the concave portion 46. These convex portions 45 and concave portions 46 are dimensioned such that the convex portions 45 and concave portions 46 can be in close contact with each other when the heat-insulating split pieces 11a and 11b are tightened in the radial direction by the support fitting 35 in a state where both are fitted to each other. And

According to such a fitting structure of the convex portion 45 and the concave portion 46, the use of the blow-moldable thermoplastic synthetic resin for the material of the heat-insulating split pieces 11a and 11b, Convex part 4 when clamped
5 and the concave portion 46 are sufficiently adhered to each other, and the tapered surfaces of the convex portion 45 and the concave portion 46 whose shapes correspond to each other are in surface contact with each other, thereby avoiding the occurrence of excessive stress therebetween. For this reason, it can be a more effective means for improving the sealing property between the connecting walls 22 and 23, that is, the heat insulating property.

The heat insulating support device 10 (FIGS. 1 to 5)
There is an internal space 26 as an adiabatic space inside each of the adiabatic split pieces 11a and 11b, and it is possible to suppress transmission of heat or cold heat on the pipe P side to the outer peripheral wall 21 side of the adiabatic split pieces 11a and 11b. . And the load of the pipe P is the end wall 2
Supported by 4,25.

The average thickness t of the heat insulating divided pieces 11a and 11b
Is 1/10 or more and 1/3 or less of the thickness T of the heat-insulating support 11 in the radial direction for the following reason. The support thickness T referred to in this specification is an average radial dimension from the inner peripheral surface of the heat insulating support 11 on the pipe P side to the outer peripheral surface (back surface) of the heat insulating support 11 as shown in FIG. is there. FIG. 6 shows an adiabatic split piece 11 having a thickness ratio (t / T) of about 1/10, and FIG. 7 shows an adiabatic split piece having a thickness ratio of about 1/3.

Table 1 below shows the results obtained by examining the main factors such as rigidity and heat insulation of six types of samples 1 to 6 (all made of PP) having different thickness ratios. FIG. 8 shows the relationship between the thickness ratio and the back surface temperature of each of the samples 1 to 6 in Table 1.

[0031]

[Table 1]

As shown in Table 1 and FIG. 8, the thickness is 3 mm (thickness ratio 1/10) to 10 mm (thickness ratio 1/10).
With the heat insulating support 11 up to 3), heat insulating performance equal to or higher than that of the conventional rigid urethane foam (back temperature: 38 ° C. or less) was obtained. Here, the back surface temperature is defined as (nominal diameter / 25 mm) × (support thickness / 30 mm) in an atmosphere of 25 ° C.
× (Length / 50mm) Nominal diameter 2 with heat insulating support attached
This is the temperature when hot water at 90 ° C. is flowed through a 5 mm pipe and the surface temperature (back surface temperature) of the heat insulating support becomes constant.

The “rear surface temperature of 38 ° C. or less”, which is a criterion for judging the quality of the heat insulating property, is that the support has a heat insulating property that does not cause dew condensation on the surface of the support when cold water of 5 ° C. flows inside the pipe P. Means Wall thickness ratio is less than 1/10 or 1
Comparative Examples (samples 1, 2, 6) exceeding / 3 could not simultaneously satisfy both the heat insulating property and the rigidity. A similar tendency was observed when a thermoplastic synthetic resin other than PP was used.

From these facts, the heat-insulating support having a hollow structure made of a thermoplastic synthetic resin increases in rigidity as the thickness ratio increases, but the heat-insulating property does not depend on whether the thickness ratio is too small or too large. It turns out that it is not good. That is, if the thickness ratio is less than 1/10, the mass (wall thickness) of the heat insulating support
In addition to the lack of rigidity due to the decrease in heat, the heat capacity (product of specific heat and weight) is reduced, and the inner peripheral wall of the heat insulating support is influenced by the temperature of the heat medium inside the pipe, and convection is activated. A predetermined heat insulating property cannot be obtained. When the thickness ratio exceeds 1/3, the heat capacity increases due to the mass of the heat-insulating support, but the volume of the internal space (heat-insulating space) of the heat-insulating support becomes too small, and the predetermined heat-insulating property is reduced. No longer available.

On the other hand, the thickness ratio is 1/10 to 1/3.
If it is within the range, there will be a moderately insulated space inside the heat-insulating support, and the convection and heat capacity will also be moderate, exhibiting good thermal insulation and satisfying the standard. Such a sufficient rigidity can be obtained.

As shown in the embodiment shown in FIG. 9, by filling the inner space 26 of the heat insulating support 11 with a heat insulating material 50 to suppress heat convection and heat radiation in the inner space 26, the heat insulating effect can be improved. Is further improved. The other configuration and operation and effect are the same as those of the embodiment shown in FIGS. 1 to 5, and therefore, common portions are denoted by common reference numerals, and description thereof is omitted.

In practicing the present invention, the form of each of the constituent elements, including the shape and configuration of the heat-insulating split pieces, the walls, and the grip auxiliary projections, and the presence or absence of a heat-insulating material, which constitute the present invention, are appropriately changed. It is needless to say that the present invention can be carried out in a modified form.

[0038]

According to the first aspect of the present invention, a high-performance heat-insulating support device having excellent heat-insulating properties while having sufficient rigidity that does not easily cause load deformation, cracking, chipping, flaws, and the like is obtained. Can be In other words, the internal space of the heat insulating support composed of the heat insulating divided pieces having the hollow structure exhibits the heat insulating function, and the transfer of heat or cold heat on the pipe side to the outer peripheral side of the heat insulating support is suppressed. In addition, since a thermoplastic resin is used, waste products can be recycled, which can contribute to resource saving. In addition, both high rigidity and heat insulation can be achieved as compared with the conventional heat insulating support block made of rigid urethane foam.

The heat-insulating support of the present invention comprising a thermoplastic resin has a smoother product surface and better appearance quality than the heat-insulating support block made of hard urethane foam, and can be colored to a desired color by a colorant. Easy. In addition, because it has moderate toughness, even if it falls on the floor or hits the wall at the construction site etc., there is no problem such as partial chipping of the heat-insulating split pieces or generation of resin chips, and to temporarily fix the support bracket Even if the projection is provided, there is no possibility that the projection is chipped. In addition, since there is no problem that the construction site is stained with urethane waste unlike the conventional product, cleaning after the construction is easy. In addition, unlike urethane foam, it can be molded without using any halogen such as chlorine, so that there is no possibility of corroding the support fitting.

As in the heat insulating support according to the second aspect,
Provided that a grip auxiliary convex portion that elastically bends and presses against the pipe is provided, the grip property with respect to the pipe is good, and the vibration absorbing action absorbs vibration of a pump or the like propagating through the pipe. . Since this also serves as a cushioning material, generation of noise is suppressed without spending extra cost. In addition, since relative displacement (positional displacement) between the heat-insulating support and the pipe in the axial direction is also avoided, a gap is formed between the heat-insulating material covering the pipe except for the heat-insulating support and the heat-insulating support. The disadvantage that a part of the piping is exposed due to the occurrence is also avoided.

According to the third aspect of the present invention, by providing a concave portion that forms a gap between the pipe and the outer peripheral surface, the concave portion can be used as a heat insulating space. The heat insulating effect can be enhanced by the pseudo composite hollow body structure by the combination. And if the heat insulating material is accommodated in the recess as described in claim 4,
By suppressing convection and heat radiation in the concave portion, the heat insulating effect can be further enhanced.

According to the fifth aspect of the present invention, since the heat insulating material is accommodated in the internal space of the heat insulating divided piece, the internal convection and heat radiation can be suppressed, so that the heat insulating effect can be further enhanced.

Since the heat-insulating split piece of the invention described in claim 6 is formed by blow-molding a thermoplastic synthetic resin, a hollow heat-insulating support having a desired thickness can be easily formed.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view partially showing a heat insulating support device for piping according to a first embodiment of the present invention.

FIG. 2 is a perspective view of a support fitting used in the heat insulating support device shown in FIG.

FIG. 3 is a cross-sectional view along the axial direction in a state where the heat-insulating support device shown in FIG. 1 is attached to a pipe.

FIG. 4 is a front view showing a part of the heat insulating support device in cross section.

FIG. 5 is a cross-sectional view along the axial direction of a heat-insulating split piece of the heat-insulating support device.

FIG. 6 is a cross-sectional view of the heat insulating support having a thickness ratio of about 1/10.

FIG. 7 is a cross-sectional view of the heat insulating support having a thickness ratio of about 1/3.

FIG. 8 is a diagram showing a relationship between a wall thickness ratio and a back surface temperature.

FIG. 9 is a cross-sectional view of a part of a heat-insulating support device showing an embodiment in which a heat insulating material is filled in a heat-insulating support.

[Explanation of symbols]

 P ... Piping 10 ... Insulation support device for piping 11 ... Insulation support 11a, 11b ... Insulation split piece 20 ... Inner peripheral wall 21 ... Outer peripheral wall 22,23 ... Connecting wall 24,25 ... End wall 26 ... Internal space 27,28 ... Grip auxiliary protrusion

Claims (6)

[Claims] 1. A heat insulating support device for a pipe, comprising a heat insulating support comprising a heat insulating split piece provided at a position to be supported on a pipe and divided into a plurality of pieces in a circumferential direction of the pipe, wherein the heat insulating split piece is a heat insulating split piece. Hollow structure made of a plastic resin and having an inner space surrounded by an inner peripheral wall surrounding the pipe, an outer peripheral wall thereof, a connecting wall provided at a portion where the heat insulating split pieces are opposed to each other, and end walls located at both ends in the axial direction. A heat insulating support device for piping, comprising a body, wherein the thickness of the heat insulating split piece is 1/10 or more and 1/3 or less of the thickness of the support in the radial direction of the heat insulating split piece. 2. A semi-cylindrical grip assisting projection projecting in the axial direction of the pipe and elastically pressable against the outer peripheral surface of the pipe at a portion of the end wall surrounding the pipe integrally with the end wall. The heat insulating support device for a pipe according to claim 1, wherein the heat insulating support device is formed. 3. The heat insulating support device for a pipe according to claim 1, wherein a concave portion is formed in an inner peripheral wall of the heat insulating divided piece to form a gap between the heat insulating divided piece and an outer peripheral surface of the pipe. 4. A heat insulating support device for a pipe according to claim 3, wherein a heat insulating material is accommodated in said concave portion. 5. The heat insulating support device for a pipe according to claim 1, wherein a heat insulating material is accommodated in an inner space of the heat insulating divided piece. 6. The heat insulating support device for a pipe according to claim 1, wherein said heat insulating split piece is made of a thermoplastic synthetic resin and is formed by blow molding.