JP2992508B2 - Manufacturing method of composite pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a composite pipe, and more particularly to a method of manufacturing a composite pipe, which is excellent in sound insulation and heat insulation and can be easily manufactured by disposing a sound insulation member made of a foamed synthetic resin. The present invention relates to a method for manufacturing a composite pipe.

[0002]

2. Description of the Related Art Conventionally, pipes through which a fluid such as a drain pipe, a water supply pipe, or a refrigerant or a heat medium is circulated block the passage noise of the fluid circulating therein or prevent freezing in a cold region. In order to do so, after the pipes are formed, a sound insulation member made of glass fiber or foamed synthetic resin is wound around the outer circumference.

[0003]

As described above, conventionally, the sound insulation and heat insulating member of the pipe through which the fluid such as the drain pipe, the water supply pipe and the refrigerant and the heat medium flows is provided to the worker after the pipe is formed. Because it is wound around on-site construction, the construction accuracy is affected by the construction technology of the worker, and it is not possible to obtain uniform and stable sound insulation and heat insulation performance, and it takes time and effort to complete the construction, which increases the construction cost There was a problem.

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-mentioned problems associated with a method of installing a sound insulating member made of glass fiber or a foamed synthetic resin around the outer periphery of the pipe after the conventional pipe has been formed. An object of the present invention is to provide a method of manufacturing a composite pipe that can achieve stable sound insulation and heat insulation performance and can be easily performed.

[0005]

In order to achieve the above object, a method of manufacturing a composite pipe according to the present invention comprises extruding an inner pipe and an outer pipe and equally spaced ribs connecting the inner pipe and the outer pipe. Filling a foamable synthetic resin material between the inner tube, the outer tube and the rib, foaming the same, and forming the inner tube, the outer tube and the rib, and the sound insulating and heat insulating member concentrically integrated at the time of production. It is characterized by being molded.

[0006] In this method of manufacturing a composite pipe, the outer periphery of a synthetic resin inner pipe is concentrically covered with a sound insulating and heat insulating member made of a foamed synthetic resin, and the outer periphery of the sound insulating and heat insulating member is covered with a synthetic resin outer tube. A composite pipe that is concentrically covered with a pipe and integrated
It can be easily manufactured.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a composite pipe according to an embodiment of the present invention.

FIG. 1 shows a reference example of a composite pipe. This composite pipe has a cylindrical inner pipe 1 made of synthetic resin having a required inner diameter and wall thickness suitable for being used as a drain pipe, a water supply pipe, or a pipe through which a fluid such as a refrigerant or a heat medium flows. A cylindrical sound insulating and heat insulating member 4 made of a foamed synthetic resin having a required thickness so that the desired sound insulating and heat insulating performance can be obtained.
Are concentrically covered with a single piece.

In this case, the inner tube 1 is made of vinyl chloride, polyethylene, polypropylene,
It is composed of any synthetic resin material such as polyester.

The sound insulation and heat insulating member 4 is made of any foamed synthetic resin material such as polystyrene, polyurethane, polyethylene or the like, depending on its use.

The composite tube is formed by extruding the inner tube 1 and extruding the outer periphery of the inner tube 1 while foaming a foamable synthetic resin material, thereby forming the sound insulating and heat insulating member 4 to be integrated.

FIG. 2 shows a first embodiment of a composite pipe manufactured by the method for manufacturing a composite pipe according to the present invention. This composite tube is
The outer circumference of a cylindrical inner pipe 1 made of a synthetic resin having a required inner diameter and wall thickness suitable for use as a drain pipe, a water supply pipe, or a pipe through which a fluid such as a refrigerant or a heat medium flows is intended. In order to obtain the desired sound insulation and heat insulating performance, the insulation cover is concentrically covered with a cylindrical sound insulation and heat insulation member 4 made of a foamed synthetic resin having a required thickness, and the outer periphery of the sound insulation and heat insulation member 4 has the desired strength. Is concentrically covered with a cylindrical outer tube 2 made of a synthetic resin having a required thickness so as to obtain a uniform thickness.

In the composite pipe of this embodiment, the inner pipe 1 and the outer pipe 2 are arranged at equal intervals, for example, 60 °, 90 °,
The ribs 3 are connected at intervals of 120 ° (in this embodiment, intervals of 120 °).

The inner tube 1 is made of an arbitrary synthetic resin material such as vinyl chloride, polyethylene, polypropylene, polyester or the like, depending on its use.

The sound insulating and heat insulating member 4 is made of any foamed synthetic resin material such as polystyrene, polyurethane, polyethylene or the like, depending on its use.

The outer tube 1 is made of an arbitrary synthetic resin material such as vinyl chloride, polyethylene, polypropylene, polyester, or the like, which is the same or different from the inner tube 1, depending on its use.

Further, the rib 3 is made of an arbitrary synthetic resin material such as vinyl chloride, polyethylene, polypropylene, polyester, etc., which is the same or different from the inner tube 1 and the outer tube 2, depending on the application.

In this composite tube, an inner tube 1, an outer tube 2, and a rib 3 are extruded, and a foamable synthetic resin material is filled between the inner tube 1, the outer tube 2, and the rib 3, and this is foamed. Thus, the sound insulating and heat insulating member 4 is formed and integrated.

FIG. 3 shows a second embodiment of a composite pipe manufactured by the method for manufacturing a composite pipe according to the present invention. This composite tube is
The outer circumference of a square tubular inner pipe 1 made of a synthetic resin having a required inner diameter and wall thickness suitable for use as a drain pipe, a water supply pipe, or a pipe through which a fluid such as a refrigerant or a heat medium flows is used. In order to obtain the desired sound insulation and heat insulation performance, the cover is concentrically covered with a rectangular synthetic sound insulation member 4 made of a foamed synthetic resin having a required thickness, and the outer periphery of the sound insulation member 4 It is concentrically covered with a rectangular outer tube 2 made of a synthetic resin having a required thickness so as to obtain the required strength, and is integrally formed. The material of the inner pipe 1, the outer pipe 2 and the sound insulating member 4 of the composite pipe, the configuration of the rib 3 connecting the inner pipe 1 and the outer pipe 2, and the like are the same as those in the first embodiment.

The embodiments of the composite pipe and the method for producing the same according to the present invention have been described above with reference to the drawings. This composite pipe is designed to allow a fluid such as a drain pipe, a water supply pipe or a refrigerant / heat medium to flow therethrough. Can be widely used for piping applications,
Depending on the application, the dimensions, such as the material, inner diameter, and wall thickness of the inner pipe 1, the outer pipe 2, and the sound insulating member 4 constituting the composite pipe, and the cross-sectional shape (for example, cylindrical, triangular cylindrical, square cylindrical, Hexagonal tubular shape) can be changed as appropriate.

[0021]

According to the composite pipe manufacturing method of the present invention, the outer periphery of the synthetic resin inner pipe is concentrically covered with the foamed synthetic resin sound insulating and heat insulating member, and the outer periphery of the sound insulating and heat insulating member is coated. It is possible to easily manufacture a composite pipe which is concentrically covered with an outer pipe made of a synthetic resin and integrated. Then, the composite pipe manufactured in this manner covers the outer circumference of the inner pipe made of synthetic resin concentrically with a sound insulating and heat insulating member made of foamed synthetic resin, and the outer circumference of the sound insulating and heat insulating member is made of synthetic resin. The pipes are concentrically covered with the outer pipes and are integrated, so they can be installed simply as drain pipes, water supply pipes, or pipes that allow fluids such as refrigerants and heat medium to flow. Heat insulation work is not required, and the inner and outer pipes and the sound insulating and heat insulating member are integrated at the time of manufacture, so that uniform and stable sound insulating and heat insulating performance can be obtained, and the strength is excellent. At the same time, workability is good and construction can be performed easily. In addition, since the inner pipe and the outer pipe are connected by equally spaced ribs, a composite pipe having high strength can be obtained.

[Brief description of the drawings]

1A and 1B show a reference example of a composite pipe, and FIG.
(B) is a longitudinal sectional view.

FIG. 2 is a first view of a composite pipe according to the method for producing a composite pipe of the present invention.
Examples are shown, in which (A) is a cross-sectional view and (B) is a longitudinal cross-sectional view.

FIG. 3 shows a second example of a composite pipe according to the method for producing a composite pipe of the present invention.
It is a cross section of an example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inner pipe 2 Outer pipe 3 Rib 4 Sound insulation heat insulation member

Claims (1)

(57) [Claims] 1. Extrusion molding of inner and outer tubes and equally spaced ribs connecting the inner and outer tubes, and filling a foamable synthetic resin material between the inner and outer tubes and the ribs, A method of manufacturing a composite pipe, which comprises foaming this to form an inner pipe, an outer pipe, and a rib, and a sound insulating member that is concentrically integrated during the manufacturing thereof.