JPS639835Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention consists of a soft synthetic resin band, a band-shaped heat insulating material, and a soft synthetic resin band, which are arranged sequentially from the inside to the outside. This invention relates to an improvement in a flexible heat insulating hose which is formed into a hose-like body consisting of three layers: an inner wall, a heat insulating layer and an outer wall by spirally winding the side edges of the hose with their side edges overlapped and welded together.

Conventional flexible insulated hoses, for example,
- As shown in Publication No. 131273, a wide strip and a narrow strip of heat insulating material are used, and the wide strip is bent into a crank shape and its side edges overlap each other. It was constructed so that the heat insulating material was wrapped in the single wide band-shaped body by welding to the wide band.

In a flexible insulated hose configured in this way,
There is an inconvenience in that a special strip supply structure is required to overlap and weld the wide strips while bending them in the middle, and also because the inner and outer walls can only be configured to the same specifications. There was an inconvenience in that the flexible hose could not be utilized more effectively by providing functional differences between the two. In other words, this type of flexible hose is used to flow fluids that require insulation inside the inner wall, or to pass objects that require insulation through it, so it is necessary to maintain the inner peripheral surface of the inner wall in the desired shape. However, increasing the thickness of the outer wall increases the weight of the entire hose and tends to reduce its flexibility, but increasing the thickness of the inner wall increases the hose's original diameter. As a result, the material that has a strong tendency to collapse in the radial direction is further strengthened, and with a small increase in wall thickness, it is possible to improve the shape retention of the inner peripheral surface of the inner wall while avoiding an increase in the weight of the hose. However, it is difficult to perform such processing on the conventional flexible hose.

In addition, although the above-mentioned conventional type is equipped with a heat insulating material, the inner and outer walls are composed of a series of thick strips, so heat conduction easily occurs through the strips forming the wall. It was hard to avoid what would happen.

Therefore, in the present invention, the inner and outer walls are constructed from separate members to increase the shape-retaining strength of the inner walls and to avoid heat conduction through the wall constituent materials. If the inner wall is simply made thicker, when the hose is bent, the inner wall will not follow the bending of the outer wall smoothly, and there will be a difference in the degree of bending between the inner and outer walls, causing the insulation to deteriorate. There is a risk that the insulation performance will deteriorate early due to strong compression in some parts, or when performing gentle bending, the inner wall will hardly bend even if the outer wall is bent. Therefore, it is possible to increase the shape-retaining strength of the inner wall without causing such inconvenience, to enable smooth bending of the inner and outer walls, and to reduce the conduction of heat through the wall constituent materials. The purpose of this invention is to avoid this. .

In other words, in order to improve the shape-retaining strength of the inner wall, rather than increasing the thickness of the entire inner wall uniformly, we increased the thickness of parts of the inner wall to ensure sufficient strength against crushing in the radial direction. The hose maintains good flexibility in the bending direction, and by connecting the easily deformable thin part of the inner wall to the outer wall with thin tape, the inner wall can easily follow the bending of the outer wall. Therefore, it is possible to easily avoid deterioration of the heat insulating material due to local compression.

In addition, since the material that connects the inner and outer walls is a thin tape that is separate from the inner and outer wall constituent materials, there is almost no risk of damaging the flexibility of the entire hose. It is also possible to freely select materials with low oxidation.

The structure of the present invention for achieving the above object will be explained using drawings corresponding to embodiments. The present invention has a structure in which a foamed synthetic resin material is formed between an inner wall A and an outer wall C made of a soft synthetic resin material. It is a flexible heat insulating hose in which a heat insulating layer B is formed, and the inner wall A is formed by winding a soft strip 1 in a spiral shape and overlapping and welding the side edges of the flexible strip 1. The heat insulating layer B has a structure in which a thick part protrudes toward the outer circumferential surface at each pitch of the threaded winding, and the heat insulating layer B spirally forms a heat insulating material 2 formed in a band shape at the same pitch as the band body 1. The inner circumferential surface of the central portion of the band-shaped heat insulating material 2 has a wound screw structure, and the inner circumferential surface of the center portion of the band-shaped heat insulating material 2 is fitted with the thick part of the band-shaped body 1 at each screw pitch, and the outer wall C is connected to the soft band-shaped body 3. is located on the outer peripheral surface of the heat insulating layer B, is wound spirally at the same pitch as the band-shaped heat insulating material 2, and has a structure in which the side edges are overlapped and welded, and the outer wall C and the inner wall A are , between the end faces of the band-shaped heat insulating material 2, which is completely separated by the heat insulating layer B and located on a thin wall portion sandwiched between adjacent thick wall portions formed on the inner wall A. A tape 4 which is a separate member from the outer wall forming strips 1 and 3 and which is much thinner than those of these strips 1 and 3 is interposed, and the outer edge portion 4b of the thin tape 4 is connected to the inside of the outer wall C. This is a flexible heat insulating hose having a structure in which inner edge portions 4a are welded to the outer circumferential surface of the inner wall A, respectively.

Since the present invention has been developed in this manner, the following effects can be expected.

Hereinafter, an embodiment of the present invention will be described based on the drawings. The formed inner wall B is a heat insulating layer formed by spirally winding a heat insulating material 2 formed from a foamed synthetic resin into a band shape on the outside of the band 1 forming the inner wall A;
C is an outer wall formed by winding a soft synthetic resin band 3 in a spiral shape on the outside of the band-shaped heat insulating material 2 forming the heat insulating layer B, and welding the side edge portions together while overlapping each other. A thin tape 4 made of soft synthetic resin is placed between the side end surfaces of the band-shaped heat insulating materials 2, 2 that are adjacent to each other in the axial direction, and both end portions 4a and 4b of the thin tape 4 are placed between the outer circumferential surface of the inner wall A and the inner surface of the outer wall C. It is interposed so as to overlap the circumferential surface and be integrally welded. Reference numeral 5 denotes a reinforcing material made of a metal wire (a wire made of hard synthetic resin may also be used) wrapped by the folded band 1 forming the inner wall A.
The folded portion of the strip 1 is overlapped with the middle portion of the strip 1 and welded together. The welding location of the thin tape 4 to the inner wall A is a location corresponding to the thin wall portion away from the reinforcing material 5 and the folded portion. Note that the heat insulating material 2 is usually not integrated with the inner wall A, the outer wall C, and the thin tape 4, but it may be integrated with any or all of them.

The flexible heat insulating hose having the above structure was manufactured as follows. The band-shaped body 1 surrounding the reinforcing material 5 is wound while being welded. In parallel with this, the band-shaped heat insulating material 2 is wound. This winding of the heat insulating material 2 is performed on at least one strip 1 subsequent to the leading strip 1, and on the tape portion 4a already welded to the one strip 1 further subsequent. Then, the thin tape 4 is wound while being superimposed on the outer surface and one side of the leading band-shaped heat insulating material 2 and the band-like body 1 located one position ahead of the leading heat insulating material 2. At this time, the portion 4a of the leading tape 4 is welded to the corresponding strip 1. Subsequently, the next band 2 is wound and welded to the leading edge tape 4 and the band 2 which has already been welded to the tape 4 which has already been wound one position after this. By repeating the above process, a flexible heat insulating hose of arbitrary length was manufactured.

Note that the reinforcing material 5 may be omitted, and in this case, the strip 1 does not need to be folded back.

[Brief explanation of the drawing]

The drawing is a partially cutaway front view showing an embodiment of a flexible heat insulating hose according to the present invention. 1, 3... Soft synthetic resin band-shaped body, 2... Band-shaped heat insulating material, 4... Soft synthetic resin thin tape, 4,
4a, 4b... end portion of 4.

Claims (1)

[Scope of utility model registration request] Inner wall A and outer wall C formed of soft synthetic resin material
A flexible heat insulating hose in which a heat insulating layer B made of a foamed synthetic resin material is formed and interposed between the inner wall A and the inner wall A, which is formed by winding a soft strip 1 in a spiral shape and polymerizing the side edges thereof. The heat insulating layer B has a structure in which the heat insulating material 2 formed in the shape of a band is welded and has a thick wall portion that protrudes toward the outer circumferential surface at each screw winding pitch of the band body 1. A structure in which the inner circumferential surface of the central portion of the band-shaped heat insulating material 2 is wound in a spiral manner at the same pitch as the band-shaped body 1, and the inner circumferential surface of the center portion of the band-shaped heat insulating material 2 is fitted with the thick wall portion of the band-shaped body 1 at each threaded pitch. The outer wall C has a structure in which a soft band-shaped body 3 is located on the outer peripheral surface of the heat-insulating layer B, is wound spirally at the same pitch as the band-shaped heat-insulating material 2, and its side edges are overlapped and welded. , the outer wall C
and the inner wall A are completely separated by the heat insulating layer B, and the band-shaped heat insulating material 2 is located on a thin wall portion sandwiched between adjacent thick wall portions formed on the inner wall A. A tape 4, which is a member separate from the inner and outer wall forming strips 1 and 3 and which is much thinner than the strips 1 and 3, is interposed between the end faces, and the outer edge portion of the thin tape 4 is 4b is welded to the inner peripheral surface of the outer wall C, and the inner edge portion 4a is welded to the outer peripheral surface of the inner wall A.