JP2002167825A - Flexible drain pipe with smooth inner surface - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drain pipe with flexibility and a smooth inner surface so as to prevent positioning error and contamination on the inner surface caused by wastewater. SOLUTION: A part of a drain pipe 5 in a wastewater trap 4 or the like is formed of flexible pipe components 6 made of a flexible material and rigid pipe components 7 made of a material harder than the flexible material, which are arranged alternately and combined so that the inner surface of the pipe is smooth. Thus structured, as the drain pipe 5 acquires flexibility, positioning error when installing the pipes at the working place is resolved. In addition, smooth inner surface of the pipe prevents contamination caused by wastewater.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drain pipe having a soft pipe portion formed in a part of a drain pipe such as a drain trap to impart flexibility and to smooth the inner surface.

[0002]

2. Description of the Related Art In a drainage device such as a hand-washing machine, a vanity table, a kitchen sink, etc., a trap is provided in order to prevent an odor from flowing backward from a sewage side. In a conventional drain trap, the entire drain pipe is formed of a hard metal material or a synthetic resin material. Therefore, when the drain trap is constructed on site, if the position of the connection portion of the drain pipe and the position of the sewage pipe are different from each other, the site construction may not be performed well. That is, in the related art in which the entire drain pipe is formed of a hard material, it may not be possible to cope with a case where a piping error occurs on site. Therefore, conventionally, measures such as adding a soft hose between both pipes have been taken.

On the other hand, conventionally, as shown in FIG. 4, a bellows pipe portion 3 is formed in a straight portion of a drain pipe 2 of a drain trap 1,
Some have flexibility. In this case,
Even if there is a piping error at the site, this can be absorbed by the bellows pipe part 3, and the drain pipe 2 of the drain trap and the sewage pipe can be connected.

[0004]

However, in the prior art in which a soft hose is added between the drain pipe of the drain pipe trap and the sewage pipe, it is difficult to secure water stopping at the connection part of the soft hose. Met. In addition, a work for separately connecting a soft hose is required, and there are drawbacks that the work is increased in complexity and cost is increased. On the other hand, in the prior art shown in FIG. 4, since the inner surface of the bellows tube portion 3 for imparting flexibility is not smooth and has unevenness, drainage dirt accumulates on the uneven inner surface, and the pipe is blocked. And the drawback is that the flow path area is reduced.

[0005]

SUMMARY OF THE INVENTION The present invention has been improved and eliminated in view of the above-mentioned problems, and provides flexibility and a smooth inner surface to eliminate piping errors and reduce drainage. It is intended to provide a drain pipe such as a drain trap which can prevent dirt.

According to the first aspect of the present invention, a part of a drainage pipe such as a drainage trap is provided by a soft pipe part made of a soft material, A flexible drain pipe having a smooth inner surface characterized by alternately and integrally forming a hard pipe portion made of a harder material, and smoothing the inner surface of the pipe. By arranging the soft tube portion and the hard tube portion alternately, it is possible to impart flexibility while smoothing the inner surface. Accordingly, it is possible to eliminate the piping error at the site and to prevent the contamination of the inner surface of the pipe with sewage, and to prevent the inner diameter from being reduced at the time of bending.

According to a second aspect of the present invention, there is provided a drain pipe such as a drain trap which is formed of a soft pipe having a smooth inner surface made of a soft material. A flexible drain pipe having a smooth inner surface, wherein a reinforcing wire is wound around and joined to the outside of the soft pipe portion. By forming a part of a drain pipe such as a drain trap using only a soft material, it is possible to ensure flexibility and smoothness of an inner surface. However, since the soft material alone is insufficient in strength, a reinforcing wire is wound around its outer surface to reinforce the material and to prevent the inner diameter from being reduced at the time of bending.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below with reference to the embodiments of the invention shown in the drawings. FIGS. 1 and 2 relate to a first embodiment of the present invention. FIG. 1 is a partial longitudinal sectional view of a drain trap 4, and FIG.
FIG. 3 is a schematic vertical sectional view of a manufacturing apparatus for explaining a method of manufacturing the drain pipe 5. As shown in FIG.
Has a straight portion of a drain pipe 5 composed of a soft tube portion 6 made of a soft material 6a and a hard tube portion 7 made of a hard material 7a. Examples of the soft material 6a include thermoplastic elastomers such as olefin (TPO) and polyamide (TPAE), and low-density polyethylene (LDP).
A thermoplastic resin such as E) is applicable. As the hard material 7a, a thermoplastic resin such as polypropylene (PP), polystyrene terephthalate (PBT), nylon (PA6), and high-density polyethylene (HDPE) can be used.

The formation of the drainage pipe 5 in which the soft pipes 6 and the hard pipes 7 are alternately formed may be performed as shown in FIG. That is, first, resins 6a and 7a having different properties (soft / hard) are plasticized by a plurality of extruders, and they are merged in an extrusion head 8, and different resins 6a and 7a are selectively controlled by computer control. Or extrude continuously. Extrusion is performed by forming a parison 9 whose material is switched in a ring shape in a single layer, storing the parison 9 in a mold (not shown), and forming a drain pipe 5 as a product.
What is necessary is just to blow-mold in the shape of. At this time, it is important that the hard tube portion 7 made of the hard material 7a is located at both ends. This takes into account the overall rigidity of the drain pipe 5 and the connectivity between the trap section and the sewage pipe.

In the drainage pipe 5 formed in this manner, the soft pipe portions 6 made of the soft material 6a and the hard pipe portions 7 made of the hard material 7a are alternately arranged.
By using the part, flexibility can be given, and it is possible to eliminate piping errors at the time of on-site construction. Also, by arranging them alternately, it is possible to secure the rigidity as a whole. Furthermore, the inner surface of the drain pipe 5 can be made smooth, and the flow passage can be maintained at a high level by sufficiently securing the cross-sectional area of the flow path without causing sewage dirt and dust to adhere and grow. It is.

FIG. 3 is a longitudinal sectional view of a drain trap 10 according to a second embodiment of the present invention. In this embodiment, a part of the straight part of the drain pipe 11 of the drain trap 10 is formed continuously with the soft pipe part 6 made of the soft material 6a. A hard tube portion 7 made of a hard material 7a is formed at both ends. The materials of the soft tube portion 6 and the hard tube portion 7 and the forming method of alternately arranging them are the same as those in the first embodiment. Thus, when the soft tube portion 6 is formed continuously, there is a problem in strength. Therefore, in the present embodiment, before the blow molding after the formation of the parison 9, the reinforcing wire 12 made of a metal material or the like is spirally or annularly wound around the soft tube portion 6 to be integrated with the soft tube portion 6. By doing so, the rigidity of the soft tube portion 6 is increased. The reinforcing wire 12 may be wound after blow molding.

In the drain pipe 11 having such a configuration, the soft pipe portion 6 has flexibility, and it is possible to eliminate a piping error at the time of on-site construction. Drain pipe 11
The inner surface is smooth and free of dirt and dirt,
It is possible to secure high circulation.

[0013]

As described above, in the present invention,
A part of the drainage pipe such as a drain trap, a soft pipe part made of a soft material, and a hard pipe part made of a material harder than the soft pipe part are integrally formed alternately and integrally, so that the pipe inner surface is smoothed. It is possible to provide flexibility to the drain pipe, and it is possible to eliminate piping errors at the site. Further, since the inner surface of the pipe is smooth, it is possible to realize prevention of dirty water on the inner surface of the pipe.

Further, in the present invention, a part of a drain pipe such as a drain trap is formed of a soft pipe part having a smooth inner surface made of a soft material, and a reinforcing wire is provided outside the soft pipe part. Since it is wound and joined, it is possible to secure flexibility and smoothness of the inner surface of the drainage pipe, and it is possible to eliminate piping errors at the site and prevent dirty water on the inner surface of the pipe. . In addition, the soft pipe part is reinforced with a reinforcing wire,
It is possible to secure sufficient strength for practical use.

[Brief description of the drawings]

FIG. 1 is a partial longitudinal sectional view showing a drain trap according to a first embodiment of the present invention.

FIG. 2 is a schematic longitudinal sectional view of an apparatus showing a method for forming a drain pipe according to the first embodiment of the present invention.

FIG. 3 is a partial vertical sectional view showing a drain pipe according to a second embodiment of the present invention.

FIG. 4 is a partial vertical sectional view showing a conventional drain trap.

[Explanation of symbols]

4 drain trap, 5 drain pipe, 6 soft pipe section, 7 hard pipe section, 8 extrusion head, 9 parison, 10 drain trap, 11 drain pipe, 12 reinforcing wire

Claims (2)

[Claims] A part of a drain pipe such as a drain trap is formed by alternately and integrally forming a soft pipe part made of a soft material and a hard pipe part made of a material harder than the soft pipe part. Flexible drainage pipe with smooth inner surface characterized by smoothing. 2. A part of a drain pipe such as a drain trap is formed by a soft pipe part having a smooth inner surface made of a soft material, and a reinforcing wire rod is wound around and joined to the outside of the soft pipe part. Flexible drainage pipe with a smooth inner surface.