JP2000146083A - Flexible pipe for fluid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To positively avoid condensation phenomenon on a pipe and flowing noise leak to the outside. SOLUTION: This pipe is formed of an internal pipe part 2 made of cylindrical soft material the inner surface of which is almost flat, and of an external pipe part 3 made of hard material wherein a belt shaped body is spirally wound around the outer surface of the internal pipe part 2 so as to be fixed thereto. And the external pipe part 3 is formed of a bottom side part 3A fixed to the outer surface of the internal pipe part 2, an upstand part 3B raised upward from the one end part in the pipe axial direction of the bottom side part 3A, a ceiling part 3C extended from the upper end part of the upstand part 3B roughly along the pipe axial direction, and of a descending part 3D lowered down toward the outer surface of the internal pipe part 2 from the free end part in the pipe axial direction of the ceiling part 3C. In this case, a part of, or the entire part of a space 4 formed by the upstand part 3B, the ceiling part 3C and the descending part 3D, is filled with heat insulating material 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible fluid pipe used for sending a fluid such as an air supply pipe, a water supply pipe, a gasoline hose, a chemical hose, and an oil-resistant hose.

[0002]

2. Description of the Related Art The above-mentioned fluid pipe has a double pipe structure of an inner pipe section and an outer pipe section so as to be able to withstand external pressure when buried in the ground or fluid pressure of a fluid flowing inside. ing.
In some cases, durability is further improved by providing a tubular covering tube on the outer surface of the outer tube. The fluid tube is made in consideration of flexibility so that it can be easily disposed on a curved path or the like.

More specifically, as shown in FIG. 10, the fluid pipe is formed such that one side of the band is integrated by heat fusion or the like while spirally winding the band. Constitutes a substantially flat cylindrical inner tube portion 22, and a belt-like body is wound around the outer surface of the inner tube portion 22 with a helical outer tube portion 23 fixed thereto, thus forming a double tube structure. Thereby, the shape-retaining strength can be increased. And
The outer tube portion 23 includes a bottom portion 23A fixed to the outer surface of the inner tube portion 22, a rising portion 23B rising upward from one end of the bottom portion 23A in the tube axis direction, and an upper end portion of the rising portion 23B. From the ceiling 23 extending substantially along the pipe axis direction
C, a descending portion 23D descending from the free end of the ceiling portion 23C in the tube axis direction toward the outer surface of the inner tube portion 22, and an extending portion extending upward from the other end of the bottom portion 23A in the tube axis direction. The cross-sectional shape of the protrusion 23E is substantially S-shaped.

[0004] As described above, the strips wound around the outer surface of the inner tube portion 22 are not connected to each other, that is, the outer tube portion 23 is not integrated in the tube axis direction. The free space T between the adjacent bottom portions 23A, 23A, that is, the portion not fixed to the outer surface of the inner tube portion 22, can have flexibility.
B, the ceiling 24C, and the space 24 formed by the descending portion 23D are in communication with the outside. Therefore, when a large difference occurs between the outside air temperature and the temperature of the fluid inside the pipe, the outer pipe section 23 There is a disadvantage that a dew condensation phenomenon occurs on the surface or in the space 24. Further, in the case where the outer surface of the outer tube portion is provided with the tubular cladding tube portion as described above, the air layer between the inner surface of the cladding tube portion and the outer surface of the inner tube portion 22 acts as a heat insulating layer to some extent. However, the effect is not enough, and a condensation phenomenon occurs on the outer surface of the cladding tube,
There was room for improvement.

[0005] Further, some fluids flowing inside the pipe generate a loud flowing noise, and at this point, sufficient measures have not been taken in this regard.

[0006]

SUMMARY OF THE INVENTION In view of the above-mentioned situation, the present invention is intended to solve the problem that it is possible to reliably prevent the occurrence of dew condensation in a pipe and the leakage of flowing noise to the outside. Another object of the present invention is to provide a fluid tube having flexibility.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an inner tube portion made of a cylindrical soft material having a substantially flat inner surface, and a belt-like body spirally formed on the outer surface of the inner tube portion. An outer tube portion made of a hard material wound and fixed to the outer tube portion, and the outer tube portion stands upright from a bottom portion fixed to the outer surface of the inner tube portion and one end portion in the tube axis direction of the bottom portion. The raised rising portion, the ceiling portion extending substantially along the pipe axis direction from the upper end portion of the rising portion, and descended from the free end portion of the ceiling portion in the tube axis direction toward the outer surface of the inner pipe portion. And a descending part,
A part or all of a space formed by the rising part, the ceiling part, and the descending part is filled with a heat insulating material. Therefore, by filling a part or the whole of the space formed by the rising part, the ceiling part, and the descending part with the heat insulating material, a heat insulating effect can be provided, and the surface of the outer tube part or the surface in the space can be provided. It is possible to avoid the occurrence of the condensation phenomenon. The larger the volume of the space filled with heat insulating material, the greater the effect of avoiding the occurrence of the dew condensation phenomenon. . Further, even when the entire space is filled with a heat insulating material, the outer tube portion is not integrated in the tube axis direction, so that the flexibility is not greatly reduced and the outer tube portion is curved almost in the same manner as the conventional case. It can be easily arranged on a route or the like. In addition, by filling with a heat insulating material as described above, a sound insulating effect can be exhibited in addition to the heat insulating effect. Further, when an external force acts on the outer tube portion, the heat insulating material can absorb the external force and function as a cushioning material.

[0008] By providing a tubular covering tube portion which is fixed to the outer surface of the ceiling portion of the outer tube portion and whose inner surface is made of a soft material having a substantially flat surface, it is possible to provide a portion where a large shape-retaining strength is required. While enabling use, it is possible to suppress a decrease in flexibility as much as possible.

An external force acting on the outer pipe portion is provided at the other end of the bottom portion in the axial direction of the tube by extending the extension portion toward the adjacent wound ceiling portion. Can be absorbed.

The extending portion divides a space defined by the rising portion, the ceiling portion, and the descending portion into two spaces in the tube axis direction, and one of the two spaces is defined by the above-described one. By filling with a heat insulating material, it is possible to exert a heat insulating effect while suppressing a decrease in flexibility as much as possible.

By applying a silicon-based or fluorine-based water-repellent agent to the outer surface of the outer tube portion, even if dew condensation occurs in the tube, it can be immediately eliminated by the flipping phenomenon. Further, for example, in a pipe which is buried and used, it is possible to prevent rainwater and the like from adhering and accumulating on the surface and causing mold and the like.

[0012]

FIG. 1 shows a fluid tube 1 having flexibility. The fluid tube 1 includes an inner tube portion 2 made of a cylindrical soft material having a substantially flat inner surface.
And an outer tube portion 3 made of a hard material having a belt-like body spirally wound and fixed to the outer surface of the outer tube. The soft material and the hard material forming the inner tube portion 2 and the outer tube portion 3 are synthetic rubber,
Synthetic resin Mixture with synthetic rubber, polyvinyl chloride, polyolefin such as polyethylene and polypropylene, and other synthetic resin materials are selected and used according to the purpose of use, etc. Softness and hardness are changed by adjusting plasticizers etc. Will do. Further, the hard material may be, for example, a metal material other than the above materials. In this case, by coating the metal material with a synthetic resin or the like, there is an advantage that fusion with the inner tube portion 2 can be easily performed.

As shown in FIGS. 2 and 3, the outer tube 3 winds a band 3X having a substantially S-shaped cross section around the outer surface of the inner tube 2 to form one of the bands 3X. The portion is fused to the outer surface of the inner tube portion 2. The band-shaped body 3X has a bottom portion 3A fixed to the outer surface of the inner tube portion 2, a rising portion 3B rising vertically upward from one end of the bottom portion 3A in the tube axis direction, and a rising portion 3B. A ceiling portion 3C extending substantially along the pipe axis direction from the upper end portion of the upper portion 3B, and a descent descending vertically from the free end portion of the ceiling portion 3C in the tube axis direction toward the outer surface of the inner pipe portion 2. Part 3
D, and an extension 3E extending toward the adjacently wound ceiling 3C at the other end of the bottom 3A in the tube axis direction. By forming the extension portion 3E, when an external force acts on the fluid pipe 1, the fluid tube 1 can function as a cushioning material for buffering the external force. May be.

The rising part 3B, the ceiling part 3C and the descending part 3D
The extending portion 3E partitions the space 4 formed by the extension portion 3E into two space portions 4A and 4B in the tube axis direction, and of the two space portions 4A and 4B, the space portion 4B on the descending portion 3D side.
Is filled with a heat insulating material 5. The heat insulating material 5 is made of, for example, a prism-shaped foam obtained by foaming various plastics such as polyethylene by 10 to 40 (the heat insulating property is optimally about 30 times). By using a soft material such as polyurethane or soft vinyl chloride resin foam and having an open cell structure as the material of the heat insulating material 5,
It well absorbs high frequency parts and is effective not only in heat insulation but also in sound absorption. The shape of the heat insulating material 5 may be circular, elliptical, or polygonal in addition to the square cross-sectional shape, and the shape of the heat insulating material 5 is not limited to these shapes. The heat insulating material 5 may be made of various fibers such as silica fiber in which fibers are entangled or ceramic fiber having excellent heat resistance. It is advantageous to use the fluid tube 1 in terms of the flexibility of the fluid tube 1.

As shown in FIG. 3, a flat strip-shaped band 2X for forming the inner tube portion 2 is spirally wound so that one side edge in the width direction partially overlaps, and the overlapped portion is formed. The inner tube portion 2 is formed by fusion bonding. Along with this, the bottom 3A of the band 3X is fused to the outer surface of the inner tube 2 while the band 3X formed in the S-shape is wound around the outer surface of the inner tube 2 and the heat insulating material 5 Is spirally sent out so as to be located in the space portion 4B to form the fluid pipe 1.

The surface of the outer tube 3 may be coated with a silicon-based or fluorine-based water repellent. As the water repellent, a silicon water repellant such as silicone oil and an emulsion of silicone oil, or a fluorine water repellant such as an ester, an alcohol, or an epoxy compound can be used.

As shown in FIG. 4 and FIG.
The present invention can also be applied to a case where a cylindrical covering tube portion 6 having a substantially flat inner surface fixed to the outer surface of the ceiling portion 3C is provided. The cladding tube portion 6 also has a belt-like body 6X for forming the cladding tube portion 6 extruded in a flat band shape similarly to the inner tube portion 2.
Is spirally wound so that one side edge in the width direction partially overlaps, and the overlapped portions are fused and joined to form the cladding tube portion 6.

The space portion 4B on the descending portion 3D side of the two space portions 4A and 4B is filled with a heat insulating material 5, but as shown in FIG. 6, the space portion 4A on the rising portion 3B side is insulated. The material 5 may be filled. When the space 4B on the side of the descending portion 3D is filled with a heat insulating material 5 as shown in FIG. 2, another object (rainwater, etc.) may pass through the gap between the lower surface of the descending portion 3D and the upper surface of the bottom portion 3A. There is an advantage that it can also function as a seal member for preventing the intrusion of the gas.

Further, by forming the rising portion 3B and the descending portion 3D in a vertical posture, the strength can be made most advantageous against an external force from a direction perpendicular to the tube axis direction. As shown in FIG. 7, the rising portion 3B and the descending portion 3
D may be formed in a direction intersecting with the tube axis direction, that is, in an inclined posture. The extending portion 3E shown in the figure also has an inclined posture parallel to the rising portion 3B and the descending portion 3D. The figure shows the case where the entire area of the space 4 is filled with the heat insulating material 5, and the heat insulating effect can be further enhanced. When the entire area of the space 4 is filled with the heat insulating material 5, the fluid pipe 1 including the inner pipe part 2 and the outer pipe part 3 may be replaced with the heat insulating material formed in a strip shape as described above. After or during the formation, the gap between the upper surface of the bottom portion 3A and the lower surface of the descending portion 3D is shut off from the outside, and then the melted liquid heat insulating material is removed from the space 4 by air pressure or the like. The heat insulating material filled or granulated is uniformly arranged in the space 4, and then the heat insulating material is foamed by applying heat, so that the heat insulating material is provided in the entire space 4. You may.

The fluid tube 1 shown in FIG.
May be configured as shown in FIG. In FIG.
A rear piece 3F extending in parallel with the pipe axis direction extends from the lower end of D to the rising part 3B side, and the lower part 3F extends from the upper end of the extension 3E.
A front piece 3G extending parallel to the pipe axis direction extends to the D side.
In FIG. 9, the ceiling 3C and the descending portion 3D are formed in a circular arc shape in cross section, and a metal plate 7 for enhancing the shape retention strength is embedded in the bottom 3A and protruded to the outside. The fused portion 6A of the cladding tube portion 6 to the ceiling portion 3C is a double band-like body in which the band-like bodies are overlapped.
By forming the fused portions 6A, 6A of the cladding tube portion 6 into a double band-like body, for example, a portion that rubs most when the fluid pipe 1 is fed in, that is, the cladding tube portion protruding to the outside. The fused portion 6A of 6 does not wear out early and the ceiling 3C is not exposed.

[0021]

According to the first aspect, a heat insulating material can be provided by filling a part or all of the space formed by the rising part, the ceiling part, and the descending part with the heat insulating material. The occurrence of dew condensation on the surface of the portion or the surface in the space can be avoided. The greater the volume of the space filled with the heat insulating material, the greater the effect of avoiding the occurrence of the dew condensation phenomenon.However, the volume of the space filled with the heat insulating material is minimized depending on the place of use, the purpose of use, etc. It may be reduced. Also, even when the entire space is filled with a heat insulating material, the outer tube portion is not integrated in the tube axis direction, so that the flexibility is not greatly reduced and the outer tube portion is curved almost in the same manner as the conventional case. It can be easily arranged on a route or the like. In addition, by filling with a heat insulating material as described above, a sound insulating effect can be exhibited in addition to the heat insulating effect.
Further, when an external force acts on the outer tube portion, the heat insulating material can absorb the external force and function as a cushioning material.

According to the second aspect of the present invention, by providing a cylindrical covering tube portion having a substantially flat inner surface fixed to the outer surface of the ceiling portion of the outer tube portion, it is possible to provide a shape requiring a large shape-retaining strength. Use can be made possible, and the range of use of the flexible tube can be expanded.

According to the third aspect, the lower end of the bottom portion in the tube axis direction is provided with an extension portion extending toward the ceiling portion to be wound adjacently, thereby acting on the outer tube portion. The external force to be absorbed can be absorbed by the extending portion, and the tube can be made hard to deform.

According to the fourth aspect, the space formed by the rising portion, the ceiling portion, and the descending portion at the extension portion is divided into two space portions in the tube axis direction, and the two space portions are formed. By filling one of them with the insulation,
The heat insulation effect can be exerted while suppressing the decrease in flexibility as much as possible, and the cost and use can be made equally advantageous.

According to the fifth aspect, by applying a silicon-based or fluorine-based water-repellent agent to the outer surface of the outer tube portion, even if dew condensation occurs in the tube, it can be immediately eliminated by the flipping phenomenon. be able to. Also, for example, in a tube that is buried and used, it is possible to prevent rainwater or the like from adhering and accumulating on the surface to cause mold or the like, thereby improving the durability of the tube itself.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view of a tube.

FIG. 2 is a sectional view showing a tube wall structure.

FIG. 3 is an exploded sectional view showing a tube wall structure.

FIG. 4 is a cross-sectional view showing another tube wall structure in which an outer tube portion is provided with a cladding tube portion.

5 is an exploded sectional view of the tube wall structure shown in FIG.

FIG. 6 is a sectional view showing a tube wall structure in which a position of a heat insulating material is changed.

FIG. 7 is a cross-sectional view showing a tube wall structure when the entire space is filled with a heat insulating material.

FIG. 8 is a sectional view showing another tube wall structure in which an outer tube portion is provided with a cladding tube portion.

FIG. 9 is a cross-sectional view showing another tube wall structure in which an outer tube portion is provided with a cladding tube portion.

FIG. 10 is a sectional view showing a conventional tube wall structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fluid pipe 2 Inner tube part 2X belt 3 Outer tube 3A Bottom part 3B Rise 3C Ceiling part 3D Falling part 3E Extension part 3F Rear piece 3G Front piece 3X Strip 4 Space 5 Heat insulation 6 Coating Tube 6A Fused 6X Strip 7 Metal plate 22 Inner tube 23 Outer tube 23A Bottom 23B Rise 23C Ceiling 23D Down 23E Extension 23F Rear half 24 Space T Free space

Claims (5)

[Claims] 1. An inner tube portion made of a cylindrical soft material having a substantially flat inner surface, and an outer tube portion made of a hard material in which a belt is spirally wound and fixed to the outer surface of the inner tube portion. , The outer tube portion, a bottom portion fixed to the outer surface of the inner tube portion,
A rising portion that rises upward from one end of the bottom portion in the pipe axis direction, a ceiling portion extending substantially along the pipe axis direction from the upper end portion of the rising portion, and a free end in the pipe axis direction of the ceiling portion And a descending portion descending from the portion toward the outer surface of the inner pipe portion, wherein a part or all of a space formed by the rising portion, the ceiling portion, and the descending portion is filled with a heat insulating material. Flexible fluid tube. 2. An outer tube fixed to an outer surface of a ceiling portion of the outer tube portion,
2. The flexible fluid tube according to claim 1, further comprising a tubular covering tube portion having a substantially flat inner surface made of a soft material. 3. The flexible fluid according to claim 1, further comprising an extension portion extending toward the ceiling portion wound adjacently, at the other end of the bottom portion in the tube axis direction. Pipe. 4. The space formed by the rising portion, the ceiling portion, and the descending portion is formed by the extending portion to be divided into two space portions in a tube axis direction, and one of these two space portions is formed. 4. The flexible fluid pipe according to claim 1, wherein the pipe is filled with the heat insulating material. 5. The flexible fluid tube according to claim 1, wherein a silicon-based or fluorine-based water repellent is applied to an outer surface of the outer tube portion.