JP5955909B2 - Insulation material layer end seal structure for heat insulation piping - Google Patents

Description

  The present invention provides a heat insulating material layer covering the entire circumference of the outer periphery of the fluid piping, and winds a chlorosulfonated polyethylene sheet having water permeability and air permeability over the entire circumference of the heat insulating material layer. In the heat insulating pipe provided with a protective layer that adheres end edges in the winding direction of the chlorosulfonated polyethylene sheet and covers the heat insulating material layer in an airtight state, a seal portion is provided at the end of the heat insulating material layer. It is related with the heat insulation material layer end seal structure of the heat insulation piping which is provided.

  Conventionally, as shown in FIG. 8, the seal portion 9 at the end portion of the heat insulating material layer 2 extends from the outside of the end portion of the protective layer 3 to the outer periphery of the fluid pipe 1 on the entire circumference in the pipe circumferential direction. A structure was formed in which a covering layer 20 was formed by wrapping a chlorosulfonated polyethylene sheet of the same material as that of the protective layer 3 (there is no appropriate literature).

In the structure of the conventional seal portion 9 described above, since the chlorosulfonated polyethylene sheet is provided with water-impermeable and air-impermeable properties, it has high airtightness and waterproofness with respect to the heat insulating material layer 2, and the protective layer 3 The heat insulating property of the heat insulating material layer 2 can be maintained high, and when a low temperature fluid flows in the fluid piping 1, the function as the protective layer 3 can be sufficiently exhibited.
However, since the chlorosulfonated polyethylene sheet has low heat resistance, when a high-temperature fluid flows in the fluid pipe 1, the airtightness between the fluid pipe 1 and the coating layer 20 is likely to be lowered. Therefore, there is a problem that moisture easily enters the heat insulating material layer 2 from the outside, and the heat insulating property is likely to be lowered based on the water intrusion into the heat insulating material layer 2.

  Accordingly, an object of the present invention is to eliminate the above-mentioned problems and improve the sealing performance in a high temperature atmosphere for the heat insulating material layer.

  The first characteristic configuration of the present invention is a chlorosulfone provided with a heat insulating material layer covering the entire circumference of the outer periphery of the fluid piping, and having an outer periphery of the heat insulating material layer that is impermeable and breathable over the entire circumference. In the heat insulating pipe provided with a protective layer covering the heat insulating material layer in an airtight state by wrapping the polyethylene sheet and adhering edges in the winding direction of the chlorosulfonated polyethylene sheet. A heat insulating material layer end seal structure of a heat insulating pipe provided with a seal portion at an end of the protective layer, and in order to constitute the seal portion, a chlorosulfonated polyethylene sheet having a constant width is entirely formed outside the protective layer. Winding over the circumference and bonding the edges in the winding direction to provide a stretchable layer, and the outer periphery of the fluid piping from one end side of the stretchable layer close to the end in the tube axis direction A heat-resistant coating layer covering the entire circumference in the pipe circumferential direction with a heat-resistant sheet having a higher heat resistance than the protective layer is provided, and the other end side of the stretchable layer is bonded to the protective layer, and the outer peripheral portion of the fluid piping To the heat-resistant coating layer and the expansion / contraction-accepting layer is provided with an airtight reinforcing layer mainly composed of a silicone resin.

According to the first characteristic configuration of the present invention, the other end side of the stretchable layer made of a chlorosulfonated polyethylene sheet made of the same material as the protective layer adheres to the protective layer while ensuring strong adhesion to the protective layer. A heat-resistant coating layer adheres to one end, and a heat-resistant coating layer that covers the entire circumference in the pipe circumferential direction across the outer periphery of the fluid piping and the expansion / contraction allowance layer, for example, even if a high-temperature fluid flows in the fluid piping The heat resistance provides air tightness to the fluid piping, prevents moisture from entering the heat insulation layer, and heat of the fluid piping due to the flow of high-temperature fluid into the fluid piping. Even if expansion occurs, the stretchable layer absorbs the elongation associated with the thermal expansion of the fluid piping while adhering to the protective layer and the heat-resistant coating layer.
Therefore, the sealing performance at the end of the heat insulating material layer can be maintained high.
In addition, by providing an airtight reinforcing layer mainly composed of silicone resin covering the heat resistant coating layer and the expansion / contraction allowance layer from the outer peripheral portion of the fluid piping, the fluid piping and the heat resistant coating layer of different materials are provided. And the deterioration of airtightness due to long-term use between the heat-resistant coating layer and the protective layer can also be prevented by the airtight reinforcing layer, and the sealing performance in a high temperature atmosphere can be further improved. .

  According to a second characteristic configuration of the present invention, the heat-resistant coating layer is made of a mixture of a silicone resin, an alkyd resin, and an acrylic resin as a main material, and a heat-resistant sheet having a reinforcing fiber layer is connected to the fluid piping from the stretchable layer. It is in the place where it was formed covering the outer periphery.

  According to the second characteristic configuration of the present invention, in addition to being able to achieve the above-described operational effects of the first characteristic configuration of the present invention, the silicone resin, alkyd resin, and acrylic resin that form the heat-resistant coating layer are provided. The heat-resistant sheet, which is mainly composed of a mixture and has a reinforcing fiber layer, is reinforced entirely by the reinforcing fiber layer. For example, even when a high-temperature fluid of about 70 ° C or higher flows in the fluid piping, it exhibits durability. However, even if no adhesive is used, the high self-adhesive property makes it possible to satisfactorily adhere to a stretchable layer made of a chlorosulfonated polyethylene sheet and fluid piping, and to exhibit higher airtightness.

  According to a third characteristic configuration of the present invention, the heat-resistant coating layer covers a heat-resistant sheet mainly composed of an aromatic polyamide and provided with a reinforcing fiber layer from the elastic layer to the outer periphery of the fluid pipe. It is where it was formed.

  According to the third characteristic configuration of the present invention, when the internal fluid temperature of the fluid pipe and the trace pipe exceeds 70 ° C., the chlorosulfonated polyethylene sheet having a low heat resistant temperature is bonded when directly attached to the base material. The strength deteriorates and the airtight performance cannot be maintained. On the other hand, by using a heat-resistant sheet mainly composed of aromatic polyamide, it can be directly attached to the base material even in the case of fluid piping and trace piping of about 70 ° C. or higher, and waterproof performance Can be maintained.

  According to a fourth characteristic configuration of the present invention, the heat-resistant coating layer is formed by covering a heat-resistant sheet including a silicone resin as a main material and a reinforcing fiber layer from the elastic layer to the outer periphery of the fluid pipe. There is.

  According to the 4th characteristic structure of this invention, the airtightness which cannot be raised with the adhesive strength of the heat-resistant sheet | seat which uses aromatic polyamide as a main material can be improved more.

  A fifth characteristic configuration of the present invention is that the airtight reinforcing layer contains carbon black.

  According to the 5th characteristic structure of this invention, high heat resistance can be provided to an airtight reinforcement layer by containing carbon black.

It is a partially cutaway perspective view of an end portion of a heat insulating material layer. It is a partially exploded perspective view explaining construction of a protective layer. It is a perspective view of the heat insulating material layer edge part before providing a seal part. It is a perspective view of the heat insulating material layer edge part after providing a seal part. It is a perspective view of the principal part. It is a longitudinal cross-sectional view of the principal part. It is a partially exploded perspective view of another embodiment. It is a longitudinal cross-sectional view of the principal part of a prior art example.

  Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the parts indicated by the same reference numerals as those in the conventional example indicate the same or corresponding parts.

In the heat insulation equipment provided with the fluid piping when the object to be insulated is the fluid piping, in FIG. 1 and FIG. 2, porous molding such as calcium silicate or rigid polyurethane foam covering the outer periphery of the fluid piping 1 over the entire circumference. The heat insulation structure of the heat insulation piping 10 which provided the heat insulating material layer 2 which consists of a body, and covered the outer side of the heat insulating material layer 2 with the water-impermeable protective layer 3 over the perimeter is shown.
When the fluid flowing through the fluid pipe 1 is a high-temperature fluid, for example, the heat insulating material layer 2 is formed of a heat-resistant calcium silicate molded body divided into a plurality of parts in the radial direction of the pipe. On the other hand, when a low-temperature fluid flows, rigid polyurethane foam (PUF) is used.
The protective layer 3 is formed by wrapping a flexible resin sheet around and covering the outside of the heat insulating material layer 2. The resin sheet 3 has a thickness of about 1 mm in which a reinforcing glass cloth is embedded and integrated in the wall thickness. Special rubber-type heat insulation resin sheet such as chlorosulfonated polyethylene sheet is non-permeable, non-breathable, weather resistant, flame retardant, chemical resistant, tensile resistant, etc. The durability above is good and appropriate.

  The resin sheet forming the protective layer 3 is wound along the outer peripheral surface of the heat insulating material layer 2, and the edge portions of the resin sheet 3 are adhered to each other to cover the heat insulating material layer 2 in an airtight state. That is, as shown in FIGS. 2 and 3, the edge portions of the resin sheet 3 are overlapped in the circumferential direction of the cylindrical heat insulating material layer 2, and phenol-based polychloroprene is formed on both surfaces of the overlapped portion. The adhesive 4 is applied to bond both edge portions together, and a sealing material 5 made of silicone resin is formed at the boundary between the upper edge portion and the lower resin sheet 3 in the overlapped portion. Is applied and sealed to be completely airtight. Further, in the longitudinal direction of the pipe, the end portions of the heat insulating material layer 2 are butted against each other, the end portions of the resin sheets 3 are butted against each other on the outer diameter side of the butted portions, and straddle the butted resin sheets 3. As shown in FIGS. 2 and 3, the belt-shaped resin sheet 3a is wound and overlapped in the circumferential direction of the pipe, and the adhesive 4 is applied to each of the overlapping surfaces to integrally bond them together.

When a high-temperature fluid is circulated through the fluid pipe 1, heating is performed between the heat insulating material layer 2 made of a calcium silicate molded body and the fluid pipe 1 through a trace pipe 6 in which an electric heater is incorporated, or steam. Trace pipes 6 composed of copper tubes are arranged side by side, and the fluid pipe 1 is heated by the trace pipes 6 so that the temperature of the fluid flowing through the fluid pipe 1 can be maintained.
In the figure, 7 is a color iron plate covering the outside of the trace tube 6, and 8 is a galvanized iron wire that is wrapped around the outer periphery of the color iron plate 7 and the outer periphery of the heat insulating material layer 2 and tied.

At the end portion of the heat insulating material layer 2, a seal portion 9 is provided to constitute a heat insulating material layer end seal structure of the heat insulating pipe 10.
As shown in FIG. 4 to FIG. 6, to form the seal portion 9, a chlorosulfonated polyethylene sheet having a certain width is wound around the entire outer periphery of the protective layer 3, and an edge in the winding direction The portions are bonded to each other to provide the expansion / contraction allowance layer 11, and heat resistance is higher than that of the protective layer 3 from the one end side of the expansion / contraction allowance layer 11 close to the end of the heat insulating material layer 2 in the tube axis direction. A heat-resistant coating layer 13 that covers the entire circumference in the pipe circumferential direction is provided with a highly heat-resistant sheet, the other end side of the stretchable layer 11 is bonded to the protective layer 3, and the heat-resistant coating layer 13 and stretchable from the outer periphery of the fluid pipe 1 An airtight reinforcing layer 14 mainly composed of a silicone resin covering the allowable layer 11 is provided.

The heat-resistant coating layer 13 is prepared by preparing a plurality of heat-resistant sheets 12 having a mixture of silicone resin, alkyd resin, and acrylic resin and having a reinforcing fiber layer, and arranging them in the circumferential direction of the fluid piping 1. The edge portions of adjacent objects are bonded to each other while being overlapped, and are covered from the expansion / contraction permission layer 11 to the outer peripheral portion of the fluid pipe 1.
Further, as shown in FIGS. 5 and 6, both ends in the longitudinal direction of the fluid pipe 1 are covered with a tape of the heat-resistant sheet 12 with respect to the heat-resistant sheet 12 in which the edge portions are overlapped in the circumferential direction of the fluid pipe. It is wound around the pipe.
The heat-resistant sheet 12 is self-adhesive, and thus adheres to other materials without an adhesive. After adhesion, the heat-resistant sheet 12 is hardened and stretched by contact with air, but in a high temperature atmosphere of 70 ° C. or higher. It has higher heat resistance than chlorosulfonated polyethylene and can maintain its strength high.

  Therefore, even if thermal expansion of the fluid piping 1 due to the flow of the high-temperature fluid into the fluid piping 1 occurs, the stretchable layer 11 made of chlorosulfonated polyethylene is formed on the protective layer 3 and the heat-resistant coating layer 13 at both ends thereof. By absorbing the elongation associated with the thermal expansion of the fluid piping 1 while adhering the edges, the seal at the end of the heat insulating material layer 2 can be maintained.

  The airtight reinforcing layer 14 is a heat-resistant paste that contains a silicone resin such as alkenoxysilane, alkoxysilane, or organosilane as a main component and contains iron oxide, carbon black, acetone, or the like. 1 is formed by coating and covering the heat-resistant coating layer 13 and the expansion / contraction-allowable layer 11 from the outer peripheral portion, and the airtight reinforcing layer 14 is made of fluids of different materials while maintaining elongation at high temperatures. The pipe 1 and the heat-resistant coating layer 13 and the deterioration of airtightness due to long-term use between the heat-resistant coating layer 13 and the protective layer 3 can be prevented.

  Next, a resin sheet A made of a chlorosulfonated polyethylene sheet for forming the protective layer 3 and a resin comprising a mixture of a silicone resin, an alkyd resin and an acrylic resin for forming the heat-resistant sheet 12 and a reinforcing fiber layer In order to examine the maintenance strength of the airtightness of the sheet B in each atmosphere at 23 ° C. (normal temperature atmosphere) and 70 ° C. (high temperature atmosphere), an experiment was performed using each tensile test as an evaluation barometer.

In addition, the resin sheet A used the sheet | seat in which the reinforcement fiber is not embed | buried in the thickness. This is because the tensile strength of the reinforcing sheet is kept high even in a high temperature atmosphere, but according to visual observation, the strength of the chlorosulfonated polyethylene itself decreases due to softening, and it becomes a state where it cannot break and maintain its airtightness. The tensile strength of the resin sheet without reinforcing fibers was measured.
On the other hand, in the resin sheet B, since the heat resistance is high and the integrity with the reinforcing fiber is high by visual observation in a high-temperature atmosphere, the heat-resistant sheet 12 to be implemented was selected as a test body.
As shown in Table 1, the experimental results show that the tensile strength at 23 ° C. is higher for resin sheet A than for resin sheet B, whereas the tensile strength at 70 ° C. is higher than that for resin sheet A. When the sheet B became larger and the resin sheet A changed from a normal temperature atmosphere to a high temperature atmosphere, the tensile strength decreased to about 1/10.

[Another embodiment]
Other embodiments will be described below.

<1> The heat insulating material layer 2 may be made of a fiber material such as glass fiber or rock wool instead of the porous molded body.
<2> The heat-resistant coating layer 13 is made of a mixture of silicone resin, alkyd resin, and acrylic resin as a main material, and instead of the heat-resistant sheet 12 having a reinforcing fiber layer, an aromatic polyamide is used as a main material and is reinforced. You may use the heat-resistant sheet | seat 12 provided with the fiber layer, and the heat-resistant sheet | seat 12 which used silicone resin as the main material and was equipped with the reinforcement fiber layer.
<3> In order to form the heat-resistant coating layer 13, the heat-resistant sheet 12 is a molded product that is divided into two in the radial direction of the fluid piping 1 as shown in FIG. In this case, the outer periphery of the fluid pipe 1 and the expansion / contraction allowance layer 11 can be easily covered, and workability can be improved.

  In addition, as mentioned above, although the code | symbol was written in order to make contrast with drawing convenient, this invention is not limited to the structure of an accompanying drawing by this entry. In addition, it goes without saying that the present invention can be carried out in various modes without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Fluid piping 2 Heat insulation material layer 3 Protective layer 9 Sealing part 11 Expansion-contraction layer 13 Heat-resistant coating layer 14 Airtight reinforcement layer

Claims (5)

Provide a heat insulating material layer covering the entire circumference of the outer periphery of the fluid piping,
Winding a chlorosulfonated polyethylene sheet having water-impermeable and non-breathable properties around the outer periphery of the heat insulating material layer, and bonding edges in the winding direction of the chlorosulfonated polyethylene sheet to each other, the heat insulation In heat-insulating piping provided with a protective layer that covers the material layer in an airtight state,
The heat insulating material layer end seal structure of the heat insulating pipe provided with a seal part at the end of the heat insulating material layer,
To constitute the seal part,
Around the outer periphery of the protective layer, a chlorosulfonated polyethylene sheet having a certain width is wound over the entire circumference, and the end portions in the winding direction are bonded to each other to provide a stretchable layer,
A heat-resistant coating layer covering the entire circumference in the pipe circumferential direction with a heat-resistant sheet having a higher heat resistance than the protective layer is provided from one end side of the expansion / contraction allowance layer close to the end in the pipe axis direction to the outer circumference of the fluid piping. ,
Adhering the other end side of the stretchable layer with the protective layer,
A heat insulating material layer end seal structure of heat insulating piping provided with an airtight reinforcing layer mainly composed of a silicone resin covering the heat resistant coating layer and the expansion / contraction allowance layer from the outer peripheral portion of the fluid piping.   The heat-resistant coating layer is formed by covering a heat-resistant sheet having a reinforcing fiber layer and a mixture of a silicone resin, an alkyd resin, and an acrylic resin from the elastic layer to the outer periphery of the fluid pipe. The heat insulating material layer end seal structure for heat insulating piping according to claim 1.   The heat-resistant coating layer is formed by covering a heat-resistant sheet having an aromatic polyamide as a main material and a reinforcing fiber layer from the stretchable layer to the outer periphery of a fluid pipe. Heat insulation material layer end seal structure of heat insulation piping.   2. The heat insulation according to claim 1, wherein the heat-resistant coating layer is formed by covering a heat-resistant sheet having a silicone resin as a main material and having a reinforcing fiber layer from the elastic layer to the outer periphery of a fluid pipe. Piping insulation layer end seal structure.   The heat insulating material layer end seal structure for heat insulating piping according to any one of claims 1 to 4, wherein the airtight reinforcing layer contains carbon black.

Images