JP7454927B2 - Heat insulation cover for flexible pipes, method for manufacturing heat insulation pipes and heat insulation covers for flexible pipes - Google Patents

Description

The present invention relates to a heat insulating cover for a flexible pipe, a heat insulating tube, and a method for manufacturing a heat insulating cover for a flexible pipe.

In general, in vulcanizers for rubber molded products such as tires, heating fluid is supplied from a fixed part to the movable part of the vulcanization chamber, which is driven up and down, as a heat source, such as heated steam. A flexible tube is connected between the original supply port and the heating fluid introduction port in the movable part, that is, between the fixed part and the movable part.

As such flexible tubes, those made of metal are useful, and in particular, flexible tubes made of stainless steel, which are nonflammable and have excellent heat resistance, durability, corrosion resistance, etc., are mentioned. Stainless steel flexible pipes (hereinafter sometimes referred to as "SUS flexible pipes") include pipes formed from stainless steel sheet material, such as spiral type or one-pitch type bellows-shaped pipes, and wire-shaped flexible pipes. Examples include flexible pipes having a blade-type pipe section such as a braid or a ribbon braid.

For example, when a SUS flexible tube is used in a vulcanizer and heated steam is passed through the SUS flexible tube, it is necessary to reduce the loss of thermal energy due to heat radiation from the SUS flexible tube, which has high thermal conductivity. Furthermore, considering the working environment around the vulcanizer, it is preferable to suppress the rise in temperature around the vulcanizer due to heat radiation.

Therefore, attempts have been made to keep SUS flexible pipes warm to suppress the loss of thermal energy and the rise in temperature of the surrounding environment. For example, the SUS flexible pipe can be kept warm by covering the pipe portion of the SUS flexible pipe with a sponge-based heat insulating material such as a foamed rubber hose, or by wrapping it with glass tape.

Furthermore, for example, Patent Document 1 describes a heat insulating cover in which the inner and outer surfaces are made of heat-resistant cloth and a heat insulating material is loaded between the inner and outer heat-resistant cloth. In order to prevent this from happening, a method of fixing it to the SUS flexible pipe using an open fastener or a tightening belt is introduced.

Japanese Patent Application Publication No. 2010-276184 Special Publication No. 2004-517222

However, the SUS flexible pipe connected between the fixed part and the movable part is subject to deformation such as bending every time the movable part moves. The glass tape may gradually unravel, exposing the SUS flexible tube and reducing heat retention performance.

In addition, in the case of sponge-based insulation materials such as foamed rubber hoses, although they can follow the deformation of SUS flexible pipes, they do not have sufficient heat retention, and cracks that spread in the longitudinal direction of the hose, called back cracks, progress over time. , the SUS flexible tube may eventually become exposed through the cracked back part and the heat retention performance may be significantly reduced.

Furthermore, in the heat insulating cover as in Patent Document 1, there is a risk that heat may be radiated to the outside from the gap between the heat insulating cover and the SUS flexible pipe through the openings at both ends of the heat insulating cover. There is a risk that the open fasteners and tightening belts will gradually loosen due to repeated deformation of the SUS flexible tube, and heat will be radiated to the outside from the loosened portions. Further, due to repeated deformation of the SUS flexible pipe, the heat insulating cover is also repeatedly deformed, which may cause the heat-resistant cloth to wear out and generate abrasion powder. Furthermore, as the heat-resistant cloth wears, holes will open in the worn parts and the heat insulating material will scatter, and there is a risk that these worn particles and the scattered heat insulating material may enter the product as foreign matter.

In view of the above problems, the present invention provides a heat insulating cover that has excellent durability and heat retention properties and is particularly suitable for flexible pipes connected between a movable part and a fixed part, and a method for manufacturing a heat insulating pipe and a heat insulating cover using the same. The purpose is to provide.

In order to solve the above problems, the heat insulation cover for a flexible pipe of the present invention is a cylindrical flexible heat insulating body, the inner and outer surfaces of the heat insulating body are heat-resistant cloth, and the space between the inner surface and the outer surface is The heat insulating body includes a heat insulating body including a heat insulating material, and a flexible tube covering the heat insulating body.

The heat-resistant cloth may be at least one selected from the group consisting of glass fiber, silica fiber, alumina fiber, carbon cloth, and AES fiber.

The heat insulating material is at least one selected from the group consisting of glass wool, rock wool, nano-silica molded body, glass mat, bulk fiber, metal sheet, alkaline earth silicate, and powdered material of any of these. Good too.

The tube may be at least one selected from the group consisting of an aluminum tube, a stainless steel tube, a glass cloth tube, a plastic tube, a fluororesin tube, and a silicone tube.

The heat insulating body may be formed by forming the bag-shaped heat-resistant cloth into a cylindrical shape, the inside of which is filled with the heat insulating material.

The heat-resistant cloth may be a heat-resistant cloth treated with a fluororesin.

Moreover, in order to solve the above-mentioned problem, the heat insulating tube of the present invention includes a flexible tube and a heat insulating cover for the flexible tube of the present invention into which the flexible tube is inserted, and the heat-resistant cloth covers the outer circumferential surface of the flexible tube. Include.

The flexible tube may be made of stainless steel.

Moreover, in order to solve the above-mentioned problem, the method for manufacturing a heat insulation cover for a flexible pipe of the present invention compresses the cylindrical flexible heat insulating body, and makes the outer diameter of the heat insulating body smaller than the inner diameter of the tube. The method includes a first compression step and a first insertion step of inserting the heat insulator into the tube.

In addition, in order to solve the above problems, the method for manufacturing a heat insulating cover for a flexible pipe of the present invention includes a second compression step of compressing the heat insulating material, and a step of wrapping the bag-shaped heat-resistant cloth to form the heat insulating material into a cylindrical shape. and a second insertion step of inserting the heat insulator into the tube, and the second compression step and the cylindrical forming step reduce the outer diameter of the cylindrical heat insulator to that of the tube. Make it smaller than the inner diameter.

As explained above, according to the present invention, a heat insulating cover that has excellent durability and heat retention properties and is particularly suitable for a flexible pipe connected between a movable part and a fixed part, and a heat insulating pipe and a heat insulating cover using the same can be manufactured. method can be provided.

FIG. 1 is a schematic diagram showing an example of a heat retaining cover for a flexible pipe according to the present invention. FIG. 2 is a schematic diagram showing an example of a heat-insulating cover for a flexible pipe of the present invention, which is different from FIG. 1. FIG. FIG. 2 is a schematic side view showing an example of a flexible tube made of stainless steel. FIG. 3 is a schematic side view showing an example of how a stainless steel flexible tube is used, which is connected between a fixed part and a movable part. It is a schematic diagram showing an example of the heat preservation tube of the present invention. FIG. 2 is a schematic side view showing an example of a usage mode of the heat-retaining tube of the present invention connected between a fixed part and a movable part. FIG. 2 is a schematic view showing a manufacturing example of the heat insulation cover for a flexible pipe of the present invention shown in FIG. 1. FIG. FIG. 3 is a schematic view showing a manufacturing example of the heat insulation cover for a flexible pipe of the present invention shown in FIG. 2;

EMBODIMENT OF THE INVENTION Hereinafter, one aspect of the manufacturing method of a heat insulating cover for a flexible pipe, a heat insulating pipe, and a heat insulating cover for a flexible pipe of the present invention will be described in detail with reference to the drawings.

[Heat insulation cover for flexible pipes]
The flexible pipe heat insulation cover of the present invention includes a heat insulator and a tube. For example, there is a heat insulating cover for flexible pipes as shown in the schematic diagram of FIG. FIG. 1(a) is a side view of the flexible pipe heat insulation cover 100, and FIG. 1(b) is a sectional view taken along line AA in FIG. 1(a).

<Insulator>
The heat insulator 10 has a cylindrical shape, and the inner surface 11 and outer surface 12 of the cylindrical heat insulator 10 are heat-resistant cloth, and a heat insulating material 20 is filled between the inner surface 11 and the outer surface 12. The inside of the inner surface 11 is hollow 15 into which a flexible tube, which will be described later, can be inserted.

Further, the heat insulator 10 has flexibility. For example, even if the operation of bending the flexible pipe heat insulation cover 100 so that the ends 101 and 102 are in contact with each other, and the operation of bending and stretching the ends 101 and 102 back into a straight line as shown in FIG. It has sufficient flexibility without causing any bending.

(Heat-resistant cloth)
As the heat-resistant cloth, for example, fibers made by melting glass into fibers, which are difficult to stretch and have excellent dimensional stability, can be used. For example, common alkali glass or non-alkali glass such as quartz glass made into fibers can be used. In the present invention, a glass fiber cloth made by weaving glass fibers into a cross shape is used as a heat-resistant cloth and used as the inner surface 11 and the outer surface 12, so that the fibers of the heat insulating material 20 break through the inner surface 11 and the outer surface 12 and scatter to the outside. By doing so, it is possible to prevent foreign substances from being mixed into products such as tires.

As the glass fiber cloth, cloth woven with a weave such as plain weave, twill weave, mock weave, leno weave, satin weave, etc. can be used. Furthermore, the weaving density of the heat-resistant cloth may be as long as it can prevent the heat insulating material 20 from scattering. For example, a glass fiber cloth made of satin weave with a vertical density of 55±2 pieces/25 mm, a horizontal density of 52±2 pieces/25 mm, and a mass of 300 g±30 g/m ² can be used for the inner surface 11 and the outer surface 12. can.

For example, as shown in FIG. 6, when a flexible pipe is inserted into the flexible pipe heat insulation cover 100 of the present invention and connected between the fixed part 400 and the movable part 500, the vertical movement of the movable part 500 shown by the arrow According to the movement, the flexible pipe heat insulation cover 100 also deforms. Due to this deformation, the inner surface 11 rubs against the heat insulating material 20 and the flexible tube, and the outer surface 12 rubs against the heat insulating material 20 and the tube 30, causing the heat-resistant cloth to wear out and scatter to the outside, causing it to mix into products such as tires as foreign matter. There is a risk of it getting lost.

Therefore, considering the wear resistance of the heat-resistant cloth, it is preferable to coat it with silicone, fluororesin, etc. By coating with fluororesin, heat resistance, steam resistance, flame resistance, corrosion resistance, etc. can be further improved. I can do it. Examples of the fluororesin coating include a polytetrafluoroethylene (PTFE) resin coating with a thickness of 0.04 to 0.06 mm, and heat-resistant cloth coated with such a coating may be used as the inner surface 11 and outer surface 12. I can do it.

As the heat-resistant cloth, in addition to the above-mentioned glass fibers, highly heat-resistant fibers can be used, such as ceramic fibers, silica fibers, alumina fibers, carbon cloths, AES fibers (Alkaline Earth Silicate Fibers), and polyimide fibers. At least one selected from the group can be used. In addition, these materials suppress friction with tubes and flexible pipes, and are resistant to wear due to friction.

(Thermal insulation)
The heat insulating material 20 is not particularly limited as long as it has heat insulating properties and can suppress heat radiation from the flexible pipe to exert a heat retaining effect. For example, glass wool solidified with glue can be used, and a glass mat having a density of 10 to 40 kg/ ^m3 and a thickness of 5 to 40 mm can be used.

In addition, as the heat insulating material 20, it is preferable to use a material that can be processed into a felt shape so that the dimensions can be easily adjusted. At least one selected from the group consisting of , alkaline earth silicate, and powdered powder of any of these can be used. Further, a composite material of a nano-silica molded body and inorganic fibers as described in Patent Document 2 can be used.

<tube>
The tube 30 is a tube that covers the heat insulator 10. In particular, aluminum can be used because it has excellent nonflammability, heat resistance, durability, and corrosion resistance. As for its shape, it is possible to cover the heat insulating material 20, and a tube with no seam in the circumferential direction can be used so that the heat insulating material 20 does not scatter or loosen due to long-term use. Specifically, a pipe formed from a thin aluminum plate material can be mentioned, and examples include a spiral type and a one-pitch type bellows shape.

Further, the tube 30 has flexibility. For example, even if the tube 30 is repeatedly bent so that the ends 101 and 102 of the flexible tube heat insulating cover 100 are in contact with each other, and then bent and stretched back into a straight line as shown in FIG. It has sufficient flexibility without bending. For example, an aluminum duct hose can be used. Specifically, an accordion duct hose manufactured by Kanaflex Corporation, which has an inner diameter of about 30 mm to 150 mm, can be used.

Moreover, as the tube 30, other than the above-mentioned aluminum tube can also be used. Specifically, at least one selected from the group consisting of an aluminum tube, a stainless steel tube, a glass cloth tube, a plastic tube, a fluororesin tube, and a silicone tube can be used, and these may be used depending on the purpose. may be used together. Note that the glass cloth tube may be a glass fiber cloth coated with a silicone resin, but is not limited thereto, and a tube without a silicone resin coating may also be used. In addition, the types of fluororesin used for fluororesin tubes include polytetrafluoroethylene (PTFE), tetrafluoroethylene/fluoroalkoxytrifluoroethylene copolymer (PFA), and tetrafluoroethylene/hexafluoropropylene copolymer. (FEP) and the like.

The heat insulating cover for flexible pipes of the present invention is not limited to the embodiment shown in FIG. 1. For example, the heat insulating cover for flexible pipes 110 shown in FIG. The heat-resistant cloth 40 may be formed into a cylindrical shape. FIG. 2(a) is a side view of the flexible pipe heat insulation cover 110, and FIG. 2(b) is a sectional view taken along line AA in FIG. 2(a). The heat-resistant cross 40 formed in a cylindrical shape has a hollow 15 inside its inner surface 13 so that a flexible tube, which will be described later, can be inserted therein. Also, the outer surface 14 is covered by a tube 30.

[Thermos tube]
The heat-retaining tube of the present invention includes a flexible tube and the heat-retaining cover for the flexible tube of the present invention. As the flexible pipe heat retaining cover, for example, the flexible pipe heat retaining cover 100 or 110 can be used.

<Flexible tube>
The flexible pipe is connected between, for example, a fixed part and a movable part, and is used to allow fluid such as liquid or gas to flow therein to transport the fluid from one of the fixed part and the movable part to the other. Note that the flexible tube may be connected between the movable parts.

Further, the flexible pipe has sufficient flexibility without being damaged or destroyed even when the flexible pipe is repeatedly bent so that both ends thereof come into contact with each other, and then bent and stretched back into a straight shape.

Depending on the type of fluid being circulated, such as LPG gas or water, such flexible pipes may be made of resin such as rubber or polyethylene, heat-resistant pipes such as silicone, or metal pipes such as aluminum or stainless steel. Examples include:

For example, if the tube is used in a vulcanizer for rubber molded products such as tires, and heated steam is to be passed through it, a flexible tube made of stainless steel, which has excellent nonflammability, heat resistance, durability, and corrosion resistance, can be used. Examples of such stainless steel flexible pipes include pipes formed from a thin sheet material made of stainless steel 304, and include bellows-shaped pipes such as spiral types and one-pitch types, and braided pipes such as wire braids and ribbon braids. Examples include flexible tubes with a section.

For example, as shown in the schematic side view of a stainless steel flexible tube 200 shown in FIG. 3, a flexible tube made of stainless steel 304 includes a ribbon braid type pipe section 210 and joint sections 220 at both ends of the pipe section 210. Things can be mentioned. Note that the pipe portion 210 is usually not provided with a retainer such as a protrusion that prevents the flexible pipe 200 from coming off from the flexible pipe heat insulation covers 100 and 110.

When the flexible tube 200 is used in the vulcanizer 600, as shown in FIG. It connects to the inlet 510 in the movable part 500 of the. Thereby, the heated steam can be circulated inside and introduced from the fixed part 400 to the vulcanizer 600. Then, as shown by the arrow, as the vulcanization chamber 520 of the movable part 500 is driven up and down, the pipe part 210 bends and expands while the flexible pipe 200 also maintains the connection state between the fixed part 400 and the movable part 500. Can be transformed.

However, when a stainless steel flexible tube 200 is used in the vulcanizer 600 and heated steam is circulated inside it, it is necessary to reduce the loss of thermal energy due to heat radiation from the highly thermally conductive flexible tube 200. be. Furthermore, considering the working environment around the vulcanizer 600, it is preferable to suppress the rise in temperature around the vulcanizer 600 due to heat radiation.

Therefore, by using a heat-retaining tube in which the heat-resistant cloth of the heat-retaining cover for a flexible pipe encloses the outer peripheral surface of the flexible pipe, it is possible to suppress loss of thermal energy and rise in temperature in the surrounding area. For example, as in a heat insulating tube 500 shown in the schematic side view of FIG. A heat-retaining tube with the flexible tube 200 inserted therein can be used by connecting it between the fixed part 400 and the movable part 500. As shown in FIG. 5B, which is an AA cross-sectional view of FIG. By reducing the gap between the flexible tube 200 and the pipe portion 210 as much as possible, heat radiation from the flexible tube 200 can be effectively suppressed and the heated steam can be kept warm.

When the heat-retaining tube 300 is used in the vulcanizer 600, for example, as shown in FIG. It is connected to an inlet 510 in the movable part 500 of the machine 600. Thereby, the heated steam can be circulated inside and introduced from the fixed part 400 to the vulcanizer 600. Then, as shown by the arrow, as the vulcanization chamber 520 of the movable part 500 is driven up and down, the heat insulating cover 110 for the flexible pipe bends and expands while the heat insulating tube 300 also maintains the connection state between the fixed part 400 and the movable part 500. and can be transformed.

The heat-retaining tube 300 of the present invention has excellent heat-retaining properties. For example, it uses a flexible pipe heat-retaining cover 110 that includes glass fiber as a heat-resistant cloth, glass wool (thickness 20 mm) as a heat insulating material, and an aluminum tube as a tube. When a stainless steel flexible pipe 200 (15A piping, inner diameter 16.1 mm, outer diameter 21.7 mm) is used as a pipe, the temperature of water vapor passing through the flexible pipe 200 is 180 °C at an outside temperature of 20 °C. On the other hand, the surface temperature of the aluminum tube 30 is 35 to 50°C, and has excellent heat retention.

This excellent heat retention is due to the fact that the heat insulating cover 100 or 110 for flexible pipes and the heat insulator 10 are in close contact with each other, and the heat insulating material 10 and the flexible pipe 200 are in close contact with each other, so that heat does not leak to the outside. It is something. Further, since the heat insulating material 10 and the flexible tube 200 are in close contact with each other, the flexible tube 200 will not easily come off from the flexible tube heat insulation cover even if the flexible tube 200 does not have a retainer.

Although FIGS. 5 and 6 illustrate an embodiment in which only the pipe portion 210 of the flexible pipe 200 is covered with the flexible pipe heat insulation cover 100 or 110, the present invention is not limited to this. For example, it is possible to adopt a mode in which the flexible pipe heat insulation cover 100 or 110 further covers a part of the joint part 220, or a mode in which the joint part 220 is completely covered.

Moreover, the joint part 220 is connected to and fixed to the fixed part 400 and the movable part 500, and is not a part that bends and stretches to deform, so there is no risk of contamination due to rubbing or wear. Therefore, for example, a heat insulating mat (specifically, TOMBO No. 4517 (glass mat) or TOMBO No. 4518 (silica mat)) is made by cutting glass fiber to a certain length, finishing it in a felt shape, and then applying needle processing. Heat dissipation from the joint part 220 can be prevented by a heat insulating means for keeping the fixed part warm, such as those manufactured by Nichias Corporation.

[Manufacturing method 1 of heat insulation cover for flexible pipes]
Next, with reference to FIG. 7, one aspect of the method for manufacturing the flexible pipe heat insulating cover 100 shown in FIG. 1 will be described as an example of the method for manufacturing the flexible pipe heat insulating cover 100 of the present invention.

<First compression process>
This step is a step in which the cylindrical flexible heat insulating body 10 is compressed to make the outer diameter OD1 of the heat insulating body 10 smaller than the inner diameter ID of the tube 30.

If the outer diameter OD1 of the heat insulator 10 is larger than the inner diameter ID of the tube 30, or if they are the same diameter, it may be difficult to insert the heat insulator 10 into the tube 30. Furthermore, even if the outer diameter OD1 is smaller than the inner diameter ID, the heat insulator 10 can be compressed to facilitate insertion into the tube 30. Therefore, it is important to perform this step.

The method of compressing the heat insulator 10 is not particularly limited. For example, the air contained in the heat insulating material 20 may be squeezed out manually or automatically by crushing the heat insulating material 10, or the air contained in the heat insulating material 20 may be pushed out by placing the heat insulating material 10 in a sealed container or the like and reducing the pressure inside the container. The heat insulator 10 can be compressed by an extrusion method or the like.

<First insertion process>
This step is a step of inserting the heat insulator 10 into the tube 30 (FIG. 7(a)). Through this step, the flexible pipe heat insulation cover 100 is completed (FIG. 7(b)).

After the first insertion process, the compressed heat insulator 10 attempts to recover to its original state as the heat insulator 20 traps air over time. As a result, if the outer diameter OD1 before insertion is larger than the inner diameter ID, the outer surface 12 of the heat insulator 10 generates a force that pushes the inner surface of the tube 30 outward, making it difficult for the heat insulator 10 to come off from the tube 30. Furthermore, it is possible to suppress the occurrence of chafing. If the outer diameter OD1 and the inner diameter ID before insertion are the same, there is no gap between the outer surface 12 of the heat insulator 10 and the inner surface of the tube 30, making it difficult for the heat insulator 10 to come off from the tube 30, and It is possible to suppress the occurrence of chafing. On the other hand, when the outer diameter OD1 is smaller than the inner diameter ID, the gap between the outer surface 12 of the heat insulator 10 and the inner surface of the tube 30 becomes smaller, making it difficult for the heat insulator 10 to come off from the tube 30, and also causing friction. can be suppressed.

Furthermore, if the diameter of the hollow 15 before insertion is smaller than the outer diameter of the pipe portion 210 as the compressed heat insulator 10 tries to recover to its original state, the inner surface 11 of the heat insulator 10 will By generating a force that pushes the surface inward, the flexible tube 200 becomes difficult to come off from the flexible tube heat insulation cover 100, and the occurrence of chafing and heat radiation can be suppressed. When the diameter of the hollow 15 before insertion and the outer diameter of the pipe section 210 are the same, the gap between the inner surface 11 of the heat insulator 10 and the surface of the pipe section 210 disappears, so that the flexible tube 200 is It becomes difficult to come off from the cover 100, and the occurrence of rubbing and heat radiation can be suppressed. On the other hand, if the diameter of the hollow 15 before insertion is larger than the outer diameter of the pipe section 210, the gap between the inner surface 11 of the heat insulator 10 and the surface of the pipe section 210 decreases, so that the flexible tube 200 is It becomes difficult to come off from the cover 100, and the occurrence of rubbing and heat radiation can be suppressed.

In addition, in the first compression process and the first insertion process, a rod-shaped guide can be inserted into the hollow 15 to assist the compression and insertion so that the shape of the heat insulator 10 does not lose its shape.

[Manufacturing method 2 of heat insulation cover for flexible pipes]
Next, with reference to FIG. 8, one aspect of the method for manufacturing the flexible pipe heat insulating cover 110 shown in FIG. 2 will be described as an example of a method for manufacturing the flexible pipe heat insulating cover 110 of the present invention different from the above.

〈Process of making it into a cylinder shape〉
This step is a step in which the bag-shaped heat-resistant cloth 40 is wound to form the heat insulator 10 into a cylindrical shape (FIGS. 8(a) and 8(b)). The bag-shaped heat-resistant cloth 40 is made into a bag-like shape by, for example, sewing two pieces of glass fiber fabric with threads such as glass fibers. The inside of this bag-shaped heat-resistant cloth 40 is filled with a glass fiber mat 20, and the entire periphery of the heat-resistant cloth 40 is sewn together so that the glass fiber mat 20 is not exposed, thereby forming a futon-shaped heat insulator 10. (Figure 8(a)). In this step, the futon-shaped heat insulator 10 is rolled up into a cylindrical shape (FIG. 8(b)).

In FIG. 2(b), the bag-shaped heat-resistant cloth 40 is wound three times and rolled into a cylindrical shape, but if the flexible tube to be inserted into the hollow 15 can be completely covered, it can be wound twice or four times. It may be wound more than once, or it may be wound once with a slight overlap and rolled into a cylindrical shape.

<Second compression process>
This step is a step of compressing the heat insulating material 20. The method of compressing the heat insulating material 20 is not particularly limited. For example, the heat insulating material 20 may be crushed manually or automatically to push out the air contained in the heat insulating material 20, or the heat insulating material 20 and the bag-shaped heat-resistant cloth 40 may be placed in a sealed container or the like to reduce the pressure inside the container. The heat insulating material 20 can be compressed by a method such as pushing out the air contained in the heat insulating material 20.

Note that the second compression step may be performed before or after the step of forming into a cylindrical shape, and the step of forming into a cylindrical shape may also serve as the second compression step. For example, the second compression step may be performed with the futon-shaped heat insulator 10 (FIG. 8(a)) before it is shaped into a tube, or the heat insulator 20 may be shaped into a tube while being compressed (FIG. 8(a)). (b)), a second compression step may be performed after forming into a cylindrical shape (FIG. 8(c)).

Through the cylindrical forming step and the second compression step, the outer diameter OD2 of the cylindrical heat insulator 10 is made smaller than the inner diameter ID of the tube. If the outer diameter OD2 of the heat insulator 10 is larger than the inner diameter ID of the tube 30, or if they are the same diameter, it may be difficult to insert the heat insulator 10 into the tube 30. Further, even if the outer diameter OD2 is smaller than the inner diameter ID, the insulation body 10 can be compressed to facilitate insertion into the tube 30. Therefore, it is important to perform these steps.

<Second insertion process>
This step is a step of inserting the heat insulator 10 into the tube 30 (FIG. 8(c)). Through this process, the flexible pipe heat insulation cover 110 is completed (FIG. 8(d)).

After the second insertion process, the compressed heat insulator 10 attempts to recover to its original state as the heat insulator 20 traps air over time. As a result, if the outer diameter OD2 before insertion is larger than the inner diameter ID, the outer surface 14 of the heat insulator 10 generates a force that pushes the inner surface of the tube 30 outward, making it difficult for the heat insulator 10 to come off from the tube 30. Furthermore, it is possible to suppress the occurrence of chafing. If the outer diameter OD2 and the inner diameter ID before insertion are the same, there is no gap between the outer surface 14 of the heat insulator 10 and the inner surface of the tube 30, making it difficult for the heat insulator 10 to come off from the tube 30, and It is possible to suppress the occurrence of chafing. On the other hand, when the outer diameter OD2 is smaller than the inner diameter ID, the gap between the outer surface 14 of the heat insulator 10 and the inner surface of the tube 30 becomes smaller, making it difficult for the heat insulator 10 to come out from the tube 30, and also causing friction. can be suppressed.

Furthermore, if the diameter of the hollow 15 before insertion is smaller than the outer diameter of the pipe portion 210 as the compressed heat insulator 10 tries to recover to its original state, the inner surface 13 of the heat insulator 10 will By generating a force that pushes the surface inward, the flexible tube 200 becomes difficult to come off from the flexible tube heat insulation cover 110, and the occurrence of chafing and heat radiation can be suppressed. If the diameter of the hollow 15 before insertion and the outer diameter of the pipe section 210 are the same, there is no gap between the inner surface 13 of the heat insulator 10 and the surface of the pipe section 210, so that the flexible tube 200 is It becomes difficult to come off from the cover 110, and it is also possible to suppress the occurrence of friction and heat radiation. On the other hand, if the diameter of the hollow 15 before insertion is larger than the outer diameter of the pipe section 210, the gap between the inner surface 13 of the heat insulator 10 and the surface of the pipe section 210 decreases, so that the flexible tube 200 is It becomes difficult to come off from the cover 110, and it is also possible to suppress the occurrence of friction and heat radiation.

In addition, in the second compression step, the step of forming into a cylindrical shape, and the second insertion step, a rod-shaped guide can be inserted into the hollow 15 to assist the compression and insertion so that the shape of the heat insulator 10 does not lose its shape.

As described above, according to the heat insulating cover for flexible pipes and the heat insulating tube of the present invention, the heat insulating material provides excellent heat retention, and since the heat resistant cloth covers the heat insulating material, it is resistant to chafing due to bending and stretching deformation, and the heat insulating material It is possible to prevent the foreign matter from being mixed into the product due to scattering. In addition, by protecting the heat insulator with a highly durable tube, it is possible to maintain heat retention performance over a long period of time.

Further, with the method for manufacturing a heat retaining cover for a flexible pipe of the present invention, the heat retaining cover for a flexible pipe of the present invention can be easily manufactured.

10 Heat insulating body 11 Inner surface 12 Outer surface 13 Inner surface 14 Outer surface 15 Hollow 20 Insulating material 30 Tube 40 Heat-resistant cloth 100 Heat insulating cover for flexible pipe 101 End portion 102 End portion 110 Insulating cover for flexible pipe 200 Flexible pipe 210 Pipe portion 220 Joint portion 300 Heat insulating tube 400 Fixed part 410 Supply port 500 Movable part 510 Inlet 520 Vulcanization chamber 600 Vulcanizer ID Inner diameter OD1 Outer diameter OD2 Outer diameter

Claims (10)

A cylindrical flexible heat insulating body, the inner and outer surfaces of which are made of heat-resistant cloth, and a heat insulating material provided between the inner surface and the outer surface;
a flexible tube that covers the heat insulator;
The tube is at least one selected from the group consisting of an aluminum tube, a glass cloth tube, a plastic tube, a fluororesin tube, and a silicone tube,
The heat insulating cover for a flexible pipe, wherein the heat insulating body is a tubular shape of the bag-shaped heat-resistant cloth filled with the heat insulating material . The heat insulation cover for a flexible pipe according to claim 1, wherein the heat-resistant cloth is at least one selected from the group consisting of glass fiber, silica fiber, alumina fiber, carbon cloth, and AES fiber. The heat insulating material is at least one selected from the group consisting of glass wool, rock wool, nano-silica molded bodies, glass mats, bulk fibers, metal sheets, alkaline earth silicate, and powders of any of these. The heat insulation cover for a flexible pipe according to claim 1 or 2. 4. The heat-insulating cover for a flexible tube according to claim 1, wherein the tube is a bellows-shaped aluminum tube. The heat insulation for a flexible pipe according to any one of claims 1 to 4 , wherein the heat insulator is a bag-shaped heat-resistant cloth filled with the heat insulating material and inserted into the tube in a compressed state. cover. The flexible pipe according to any one of claims 1 to 5 , wherein the heat insulator is formed by wrapping the bag-shaped heat-resistant cloth filled with the heat insulating material three times or more and rolling it into a cylindrical shape. Thermal cover. flexible tube,
and a heat insulating cover for a flexible pipe according to any one of claims 1 to 6 into which the flexible pipe is inserted,
A heat-retaining tube, wherein the heat-resistant cloth encloses an outer peripheral surface of the flexible tube. The heat-retaining tube according to claim 7 , wherein the flexible tube is made of stainless steel. A cylindrical flexible heat insulator, the inner and outer surfaces of which are made of heat-resistant cloth, and a heat insulator with a heat insulating material between the inner surface and the outer surface, and a flexible material that covers the heat insulator. A method for manufacturing a heat insulation cover for a flexible pipe, comprising: a tube;
a first compression step of compressing the cylindrical flexible heat insulator to make the outer diameter of the heat insulator smaller than the inner diameter of the tube;
A method for manufacturing a heat retaining cover for a flexible pipe, the method comprising: a first insertion step of inserting the heat insulator into the tube. A cylindrical flexible heat insulating body, the inner and outer surfaces of which are made of heat-resistant cloth, a heat insulating material is provided between the inner surface and the outer surface, and the inside is filled with the heat insulating material in the form of a bag. A method for manufacturing a heat insulation cover for a flexible pipe, comprising: a heat insulating body in which the heat-resistant cloth is formed into a cylindrical shape; and a flexible tube covering the heat insulating body,
a second compression step of compressing the heat insulating material;
a step of winding the bag-shaped heat-resistant cloth to make the heat insulator into a cylindrical shape;
a second insertion step of inserting the heat insulator into the tube,
A method of manufacturing a heat retaining cover for a flexible pipe, wherein the second compression step and the step of forming the tubular heat insulator make the outer diameter of the tubular heat insulator smaller than the inner diameter of the tube.

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