JP3371243B2 - Insulated hose - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat insulating hose structure suitable mainly for use as a drain hose for an air conditioner.

[0002]

2. Description of the Related Art Insulation hoses that have been used in the past are
A structure in which a band material made of foamed synthetic resin cut to a predetermined width is spirally wound around the outer peripheral surface of the inner tube while abutting the cut surfaces, and a synthetic resin tape is spirally wound and covered on the outer surface. Is generally known and used. In addition, a strip of foam plastic is attached to the outer peripheral surface of the straight tubular pipe in the longitudinal direction, the width direction is rounded into a tubular shape, and both side edges are joined together along the pipe axial direction to form a heat insulating coating layer. The technology of the formed heat insulating pipe is also proposed and known. Further, it is also known that the inner tube is a bellows tube that projects annularly in the outer peripheral direction in order to have flexibility.

[0003]

The former generally known heat-insulating hose is such that the strip of foamed synthetic resin and the covering tape are spirally wound, and particularly in the covering tape, a part of the tape. Since they must be formed by stacking and adhering them, they were not necessarily satisfactory in terms of production efficiency. Further, in the latter heat insulating pipe, since the heat insulating material is formed by connecting the heat insulating material in the longitudinal direction along the longitudinal direction of the core pipe, it has the advantage of increasing the production efficiency. The heat insulating material has a problem that it moves relatively to the inner pipe and is easily separated, and a space is formed between the heat insulating material and the surface of the pipe, resulting in poor heat insulating properties.

Therefore, the present invention has an object to solve the problems of the conventional heat insulating hose, and the heat insulating materials are connected in the longitudinal direction to form a tubular shape in advance, and the tubular shape is formed. By fitting the formed heat insulating material onto the inner pipe, the production efficiency can be increased, and the relative fitting state between the inner pipe and the heat insulating material can be sufficiently maintained to sufficiently maintain the heat insulating effect. The present invention aims to provide a heat insulating hose that can be smoothly bent without hindering the bendability of the hose.

[0005]

The structure of the present invention, which was devised to achieve the above object, will be described with reference to the reference numerals used in the examples. The first structure of the heat insulating hose according to the present invention is Bending-deformable inner tube made of resin without joint 1
And a cylindrical heat insulating layer 2 made of a foamed synthetic resin that covers the outer peripheral surface of the inner tube 1. The inner tube 1 has an axial cross section in which the inclined surfaces on both sides form an acute angle and the apex is arcuate. A large number of annular protrusions 11 ... Are formed at intervals wider than the width of the annular protrusions 11 in the axial direction, and
The base portions 12 and 13 are integrally formed at both ends in the longitudinal direction, and the heat insulating layer 2 has a foam synthetic resin sheet cut into a strip shape and has side edge portions contacting each other along the longitudinal direction. A seam 25 that is applied and joined in a tubular shape
And the inner diameter IS of the inner tube 1 is
Is set to be smaller than the maximum diameter OD of the annular protrusion 11 of
The heat insulating layer 2 is fitted onto the inner pipe 1 so that the annular projection 11 moves relative to the heat insulating layer 2 with the top of the ring protruding into the heat insulating layer 2.
Are held in a blocked state, and the individual annular protrusions 11
The inner pipe 1 is covered with an independent heat insulating space therebetween .

The second structure is composed of a seamless and bendable inner tube 1 made of synthetic resin, and a cylindrical foamed synthetic resin heat insulating layer 2 covering the outer peripheral surface of the inner tube 1. In the axial cross-sectional shape of the inner pipe 1, the angle θ at which the inclined surfaces on both sides intersect is an acute angle of 10 to 30 degrees, and a large number of annular projections 11 ... Where P is the protrusion interval in the tube axis direction and W is the width of the protrusion base in the tube axis direction, the value of P-W / W ≧ 1.2 is satisfied, and the base parts 12 are provided at both ends in the longitudinal direction. 13 is integrally formed, and the heat insulating layer 2 has a seam 25 in which a foam synthetic resin sheet cut into a strip shape is joined in a tubular shape with its side edges contacting each other along the longitudinal direction. And the inner diameter IS of the annular projection 1 of the inner pipe 1 is
The heat insulating layer 2 is set to have a diameter smaller than the maximum diameter OD of 1.
Is fitted onto the inner pipe 1 so that the top of the annular projection 11 has the heat insulating layer 2
In the state where it bites into the
It is held as a state, and it is independent between the individual annular projections 11.
The structure is such that the inner tube 1 is covered with the heat insulating space .

[0007]

DETAILED DESCRIPTION OF THE INVENTION Further, as an embodiment of the present invention
The heat-insulating layer 2 has a foam synthetic resin made of a closed-cell foam, and the heat-insulating layer 2 has an uneven surface 22 over the entire surface.
This can be carried out by providing a processed structure, and by further covering the outer peripheral surface of the heat insulating layer 2 with a thin film skin layer 3.

That is, the present invention has the above-mentioned constitutions, and in carrying out the heat-insulating hoses of these constitutions, the inner pipe 1 used is, for example, polyethylene (PE) / polypropylene (PP). An appropriate flexible synthetic resin material such as a polyolefin resin or polyvinyl chloride resin (PVC) is used, and is provided with a large number of annular projections 11 ... age,
The inner tube 1 has the mouthpieces 12 and 13 integrally formed at both ends in the longitudinal direction . Further , by allowing the mouthpiece portions 12 and 13 to be fitted to each other exactly, it is possible to use the heat insulating hoses having the same shape by connecting them.

The foamed synthetic resin material forming the heat insulating layer 2 is preferably a closed cell foam in order to prevent water from penetrating and enhance the heat insulating effect, and to impart excellent weather resistance. It is assumed that a thin film is laminated on the surface of the heat insulating layer to form the outer skin layer 3, and that the entire surface is textured so that wrinkles and folds do not occur when the hose is bent. You can also A seam 25 formed by cutting such a foamed resin sheet into a band shape and joining the side edge portions along the longitudinal direction into a tubular shape.
The structure has

The heat insulating layer 2 thus formed is fitted onto the outer circumference of the inner pipe 1 with the tip end portions of the annular projections 11 ... At this time, in order to fit the cylindrical heat insulating layer 2 to the outer circumference of the inner pipe 1 and prevent the heat insulating layer 2 fitted and held from moving from the inner pipe 1 and falling off, Inner diameter IS of heat insulating layer 2
The maximum diameter OD of the inner tube 1 is larger than that of the inner tube 1, and the annular projection 11 has an axial cross-sectional shape, and the angle θ at which the inclined surfaces on both sides intersect is an acute angle of 10 to 30 degrees.
It is desirable that the top be arcuate.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 7 are views showing a heat insulating hose of a first embodiment of the present invention. FIG. 1 is a perspective view showing a whole shape of a hose by removing a part of the hose, and FIG. FIG. 3 is a front view in which a part of the overall shape of the hose is broken and removed, and FIG. 3 is an external view of the hose. 4 is a front half sectional view for explaining the structure of the heat insulating hose, FIG. 5 is a side view of the inner pipe, FIGS. 6 and 7 are side views of the heat insulating layer 6 and its modification,
FIG. 8 is a cross-sectional view of the heat insulating hose taken along the line AA in FIG.

The heat insulating hose H of the first embodiment is a hose comprising an inner pipe 1 and a heat insulating layer 2, and an outer skin layer 3 on the outer peripheral surface of the heat insulating layer 2, wherein the inner pipe 1 is made of polypropylene resin. And a large number of annular projections 11 ... Are formed over the entire length of the pipe body at appropriate intervals in the pipe axis direction.
It is a seamless pipe body in which bending deformation can be easily made at any appropriate portion by the large number of annular projections 11 ... The male side cap portion 12 and the female side cap portion 13 which can be fitted and connected to the target object are integrally molded. In the shape of this embodiment, the ratio of the inner diameter ID of the inner pipe 1 to the maximum diameter OD (φ20 mm) of the annular projection 11 is about 1.3.
Thus, the apex angle θ of both side walls of the annular protrusion 11 is about 27 degrees.
It is needless to say that the material is not limited to polypropylene as described above, and may be a polyolefin resin, a polyvinyl chloride resin, or any other suitable synthetic resin material.

As shown in FIGS. 6, 8 and 10, the heat insulating layer 2 is a sheet 21 of a foamed synthetic resin material of a closed cell foam.
On the surface (thickness of about 4 mm in this embodiment), a film 3 having a thickness of 90 μ is pressure-bonded by a roll 51 for the purpose of imparting weather resistance, and is further subjected to a texturing process by passing through a texturing roll 52 to form a surface It becomes the uneven surface 22. After that, it is cut into a predetermined width by a cutting blade 53, and the cut surfaces 23 are butted and adhered to each other to form a cylindrical shape having an inner diameter of φ18 mm. Therefore, a seam 25 along the length direction appears on the side surface of the heat insulating layer 2. In the present embodiment, the cutting surface 23 is at right angles to the surface of the sheet 21, but as in the modification shown in FIG. 7, the cutting blade 53 is inclined during cutting so that both side edges of the sheet are cut. Sloped cut surfaces 24, 2 in opposite directions
By setting the number to 4, it is possible to improve the adhesive force by joining the joint 25 at the time of forming the tubular body with a wide contact surface inclined in the thickness direction. Inner tube 1 in FIG.
3 shows a state before the heat insulating layer 2 is fitted. After this state,
The heat insulating layer 2 is externally fitted on the inner pipe 1 to form a heat insulating hose having an external structure shown in FIGS.

FIG. 11 shows the structure of the second embodiment. The exterior coating film 3 is omitted from the heat insulating layer 2 of the second embodiment. However, in the case of the figure, the surface of the heat insulating layer 2 is shown to have an uneven pattern directly formed. This embodiment can reduce the manufacturing cost for the heat insulating hose used in the place where the weather resistance is not required.

In the heat insulating hose having such a structure, the female side cap portion 13 on one end side is connected to a drain port of a required device, for example, an air conditioner, and is used for drainage. Also,
When the length is not enough, as shown in FIG. 12, the male side cap portion 12 on the tip side of the heat insulating hose is inserted and fitted with the female side cap portion 13 of another heat insulating hose of the same shape through the packing 4. And extend it for use. Corresponding to such a case, the heat insulating layers 2 and 2 of both heat insulating hoses are set to have a length such that their end faces can contact each other. Incidentally, FIG.
As shown in FIG. 3, when the male side cap portion 12 and the female side cap portion 13 of the inner pipe 1 are finished in such a dimensional relationship that they can be closely connected to each other, at the time of connection, the packing 4 Needless to say, is unnecessary.

Although the examples considered to be typical of the present invention have been described above, the present invention is not necessarily limited only to the structures of these examples, and has the above-mentioned constitutional requirements of the present invention, and The present invention can be carried out by appropriately modifying it within a range that achieves the object of the present invention and has the following effects.

[0017]

As is apparent from the above description, the heat insulating hose according to the present invention includes an inner tube having a seamless deformable annular projecting ridge made of synthetic resin, and an outer peripheral surface of the inner tube. And a heat insulating layer made of a foamed synthetic resin for covering the foamed resin sheet, the heat insulating layer is cut into a predetermined width in advance, and its side edges are brought into contact with each other to form a cylindrical shape. With the processed heat insulation layer fitted to the inner pipe, the state where the tip of the annular projection formed on the outer peripheral surface of the inner pipe bites into the heat insulation layer to prevent relative movement with the heat insulation layer Retained
It was, like that separate insulating space between the individual annular ridge is obtained
Since it is covered with the inner pipe in the state, it is possible to obtain a heat-insulating hose that is more excellent in heat insulation than the heat insulation effect of the heat insulation layer itself,
Further, since the inner pipe is provided with the mouthpieces integrally formed at both ends in the longitudinal direction, there is no concern that the inner pipe leaks water from the mouthpiece, and immediately without any post-processing. It has a remarkable effect that it can be used as a drain hose for an air conditioner, and can be easily manufactured at low cost. Also, when a material having a film-like outer layer integrally formed on the surface of the heat insulating material is used as the material forming the heat insulating layer, a pipe excellent in weather resistance can be obtained by the action of the attached film. If the surface is textured, it will not be unpleasant in appearance due to irregular wrinkles or folds on the outer surface of the bent portion even if it is bent, and it will be in a beautiful appearance. It has an effect that it can be used by being bent and deformed.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing a first embodiment.

FIG. 2 is a partially cutaway side view of FIG.

FIG. 3 is an external view of FIG.

FIG. 4 is a side half sectional view of FIG. 1.

5 is a front view of the inner pipe of FIG.

FIG. 6 is a front view of the heat insulating layer of FIG.

7 is a front view of a modified example of the heat insulating layer of FIG.

8 is a cross-sectional view taken along the line AA in FIG.

FIG. 9 is a perspective view showing a state before fitting the inner pipe and the heat insulating layer.

FIG. 10 is an explanatory perspective view showing a manufacturing means of a heat insulating layer.

FIG. 11 is a partially cutaway side view showing the hose of the second embodiment.

FIG. 12 is a side half cross-sectional view showing the state of the connection portion of the heat insulating hose.

FIG. 13 is a side half cross-sectional view showing a modified example of the connection portion of the heat insulating hose.

[Explanation of symbols]

1 inner tube 11 Inner tube annular ridge 12 Male side base 13 Female side base 2 heat insulation layer 25 seams 3 outer skin layer

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, Masaru Sato 1-2-1, Sakaemachi, Takatsuki City, Osaka Prefecture Totaku Kogyo Co., Ltd. (56) Reference JP-A-54-112011 (JP, A) JP-A 11-14128 (JP, A) Actually opened 63-113863 (JP, U) Actually opened 61-151124 (JP, U) Actually opened 60-182584 (JP, U) Actually opened 60-96929 (JP, U) Actually open 59-42384 (JP, U) Actually open 56-149182 (JP, U) Actually open 3-40822 (JP, U) Actually open 2-141791 (JP, U) Actually open 47 −28241 (JP, Y1) (58) Fields investigated (Int.Cl. ⁷ , DB name) F16L 59/147 F16L 11/11

Claims (5)

(57) [Claims] 1. A seamless resin bendable inner tube (1) made of synthetic resin, and a tubular foamed synthetic resin heat insulating layer (2) covering the outer peripheral surface of the inner tube (1). In the axial cross-sectional shape of the inner pipe (1), the annular ridges (11) whose inclined surfaces on both sides form an acute angle and whose apex has an arc shape are arranged in the axial direction of the annular ridge (11). The heat insulating layer is formed in a large number at intervals wider than the width, and is provided with base parts (12) and (13) integrally formed at both ends in the longitudinal direction thereof.
(2) is a structure having a seam (25) in which the foamed synthetic resin sheet cut into a strip is joined in a tubular shape by abutting the side edges along the longitudinal direction, and its inner diameter (IS) Is set to be smaller than the maximum diameter (OD) of the annular ridge (11) of the inner pipe (1), and the heat insulating layer (2) is fitted onto the inner pipe (1) to form the annular ridge (11). insulation layer in a state where the top took dig into the heat insulating layer (2)
Hold it as a state in which relative movement with (2) is blocked, and
A state in which an independent heat insulation space is obtained between the annular projections (11)
Insulated hose covered in the inner tube (1) with. 2. A seamless resin bendable inner tube (1) made of synthetic resin, and a cylindrical foamed synthetic resin heat insulating layer (2) covering the outer peripheral surface of the inner tube (1). In the axial cross-sectional shape of the inner pipe (1), the angle (θ) at which the inclined surfaces on both sides intersect is 10
A large number of annular projections (11) having an acute angle of 30 to 30 degrees and an arcuate top have a projection interval P of the projections (11) in the axial direction of the pipe.
And W is the width of the protruding base in the pipe axis direction, P
-W / W ≧ 1.2 is satisfied, and both end portions in the longitudinal direction thereof are provided with mouthpiece portions (12), (13) in an integrally formed state, and the heat insulating layer (2) is The foamed synthetic resin sheet cut into a strip has a structure having a seam (25) joined in a tubular shape by abutting the side edges together along the longitudinal direction, and the inner diameter (IS) of the inner pipe (IS) It is set smaller than the maximum diameter (OD) of the annular ridge (11) of 1), and this heat insulation layer (2) is
It is fitted on the inner pipe (1), and the top of the annular ridge (11) is the heat insulating layer (2).
Block the relative movement with the heat insulation layer (2)
Held as a stand-alone state and independent between the individual annular ridges (11).
A heat- insulating hose covered with an inner tube (1) in a condition that provides a heat-insulating space . 3. The heat insulating hose according to claim 1, wherein the foam synthetic resin of the heat insulating layer (2) is a closed cell foam resin. 4. The heat insulating hose according to claim 1, wherein the heat insulating layer (2) has an uneven surface (22) processed on the entire surface. 5. The heat insulating hose according to claim 1, wherein the outer peripheral surface of the heat insulating layer (2) is covered with an outer skin layer (3).