JP3123757U - Plastic water supply / drainage pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plastic water supply / drainage pipe used for water supply / drainage, which has a function of externally blocking noise due to water flow and a heat insulating function.
An intermediate layer made of foamed resin is interposed between an inner layer tube and an outer layer tube, and a spiral protrusion is integrally formed on the inner peripheral surface of the inner layer tube. .
[Selection] Figure 1

Description

  The present invention relates to a plastic water supply / drainage pipe used for water supply / drainage, and particularly to a water supply / drainage pipe that is effective as a vertical pipe.

  As the plastic water supply / drainage pipe, a PVC pipe which is a single cylinder body having a predetermined strength (thickness) is frequently used. However, in such a single pipe, particularly when drainage flows in a pipe which is a gap, drainage noise is generated and noise is generated outside. In the case of water supply pipes, condensation occurs on the pipe surface when the outside air temperature is low, and in the case of exposed pipes, the exposed pipes are covered with a heat insulating material in order to prevent freezing and to keep warm. There must be.

  Therefore, the inner part and the outer part of the pipe are divided into a large number of partition spaces to improve heat insulation and sound insulation, and a spiral ridge is formed integrally on the inner peripheral surface of the pipe to make the drainage flow vortex. A water supply and distribution pipe was proposed (Patent Document 1).

Japanese Patent Laid-Open No. 2002-235877.

  In order to provide a heat insulation sound insulation function, a water supply / drainage pipe with an intermediate layer as a space was proposed, but in order to exhibit a predetermined heat insulation sound insulation function, an intermediate layer with a corresponding thickness is required, and the intermediate layer Since the layer is a space, the inner layer tube and the outer layer tube need to have appropriate thicknesses in terms of strength. Accordingly, when the entire pipe is viewed, the pipe thickness increases, and a reduction in pipe efficiency (pipe thickness and flow efficiency) is inevitable.

  Therefore, the present invention proposes a new plastic water supply / drainage pipe having a heat insulation and sound insulation function.

  The plastic water supply / drainage pipe according to the present invention has an intermediate layer made of foamed resin interposed between an inner layer pipe and an outer layer pipe, and a spiral protrusion integrally formed on the inner peripheral surface of the inner layer pipe. It is characterized by.

  Since the present invention adopts the above configuration, the intermediate layer formed of foamed resin has a heat insulation and sound insulation function. Compared to the conventional water supply and drainage pipe in which the intermediate layer is formed in the space, the pipe Since the thickness can be reduced, weight reduction and increase in tube efficiency can be realized.

  Next, an embodiment of the present invention will be described. The plastic tube shown in the embodiment has a structure including an inner layer tube 1, an outer layer tube 2, and an intermediate layer 3.

  Since the inner layer pipe 1 and the outer layer pipe 2 are made of hard vinyl chloride resin and the intermediate layer 3 is made of vinyl chloride foam resin and thermoplastic resin, the unsolidified tubular body is extruded from the mold and foamed together with the inner and outer layers. The tubes 1 and 2 are cooled and solidified to fill the space between the inner layer tube 1 and the outer layer tube 2 with the foamed intermediate layer 3.

  In particular, the inner layer tube 1 is formed by integrally forming a spiral protrusion 4 on the inner peripheral surface.

  The plastic pipe is used in the same manner as the conventional water supply / drainage pipe, and is filled with the intermediate layer 3 made of foamed resin between the inner and outer layer pipes 1 and 2. The sound generated by the drainage flow is prevented from being transmitted to the outside by the intermediate layer 3 serving as a blocking layer. Further, since the intermediate layer 3 has a heat insulating function, it has a dew condensation preventing function and a heat retaining function without providing an outer cover.

  In particular, since the spiral protrusion 4 is provided on the inner peripheral surface of the inner layer pipe 1, when used as a vertically arranged water distribution pipe, the downstream drainage falls straight down the central space of the pipe, Falling down to the inner wall of the pipe (inner pipe inner peripheral surface), the falling water flow is swirled by the ridges 4 and the central part of the pipe tends to be space, and air movement from below corresponding to the falling water flow is smooth. Therefore, the generation of sound due to the drainage flow can be suppressed, and noise reduction is further promoted.

The perspective view of the embodiment of the present invention. FIG. FIG.

Explanation of symbols

1 Inner layer tube 2 Outer layer tube 3 Intermediate layer 4 Helical ridge

Claims (2)

   A plastic water supply / drainage pipe characterized by interposing an intermediate layer made of foamed resin between the inner layer pipe and the outer layer pipe and integrally forming a spiral protrusion on the inner peripheral surface of the inner layer pipe .   The plastic water supply / drainage pipe according to claim 1, wherein the inner layer pipe, the outer layer pipe and the foamed resin are made of vinyl chloride.

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