JPH11325326A - Manufacture of composite pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain uniform and stable sound insulation and heat insulation performance and easily perform an execution by performing extrusion molding for an internal pipe, an external pipe and equally spaced ribs connecting the internal pipe and the external pipe, filling a foaming synthetic resin material among the internal pipe, the external pipe and the ribs, and foaming the material. SOLUTION: An outer periphery of a synthetic resin cylindrical internal pipe 1 of a required inner diameter and thickness is concentrically coated with a foaming synthetic resin cylindrical sound insulation and heat insulation member 4 of required thickness and is integrated. Extrusion molding is performed for the internal pipe 1, and the sound insulation and heat insulation member 4 is molded and integrated by performing extrusion molding, foaming a foaming synthetic resin material on the outer periphery. Further, the outer periphery of the sound insulation and heat insulation member 4 is concentrically coated with synthetic resin cylindrical external pipe 2 of required thickness and is integrated. The internal pipe 1 and the external pipe 2 are connected by ribs 3 formed at equal intervals.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite pipe and a method of manufacturing the same, and more particularly, to providing a sound insulating and heat insulating member made of a foamed synthetic resin. And a method of manufacturing the same.

[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. It is an object of the present invention to provide a composite pipe capable of obtaining stable sound insulation and heat insulating performance and being capable of easily performing construction, and a method of manufacturing the same.

[0005]

In order to achieve the above object, a composite pipe according to the first aspect of the present invention is provided by concentrically covering the outer periphery of an inner pipe made of synthetic resin with a sound insulating member made of foamed synthetic resin. And are integrated.

In this composite pipe, the outer circumference of the inner pipe made of synthetic resin is concentrically covered with a sound insulating member made of foamed synthetic resin, so that it is integrated. It becomes unnecessary, and together with the fact that the inner pipe and the sound insulation member are integrated at the time of manufacture, uniform and stable sound insulation insulation performance can be obtained, workability is good, and construction can be performed easily. .

Similarly, in the composite pipe according to the second aspect of the present invention, the outer periphery of the inner pipe made of synthetic resin 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 synthesized. It is characterized by being concentrically covered with an outer tube made of resin and integrated.

In this composite pipe, the outer periphery of the synthetic resin inner pipe is concentrically covered with a foamed synthetic resin sound insulating and heat insulating member, and the outer periphery of the sound insulating and heat insulating member is covered with a synthetic resin outer pipe. Concentrically covered and integrated, sound insulation and insulation work after piping by on-site construction is not required, and the inner and outer pipes and the sound insulation and insulation members are integrated at the time of manufacture, making it uniform. Stable sound insulation and heat insulation performance can be obtained, and the strength is excellent, the workability is good, and the construction can be easily performed.

In this case, the inner pipe and the outer pipe can be connected by a rib.

As a result, a composite tube having high strength can be obtained.

[0011] The method of manufacturing a composite pipe according to the present invention relates to the method of manufacturing the composite pipe of the second invention, wherein the inner pipe and the outer pipe are extruded and a foamable synthetic pipe is formed between the inner pipe and the outer pipe. It is characterized in that a resin material is filled and foamed to form a sound insulation member. In this case, when the composite pipe has a rib connecting the inner pipe and the outer pipe, the inner pipe, the outer pipe, and the rib are extruded, and a foamable synthetic resin material is interposed between the inner pipe, the outer pipe, and the rib. And foamed to form a sound insulation member.

In the method of manufacturing a composite pipe, an inner pipe and an outer pipe are extruded, a foamable synthetic resin material is filled between the inner pipe and the outer pipe, and the foamed resin material is foamed to form a sound insulating and heat insulating member. By doing so, the outer periphery of the inner tube made of synthetic resin is concentrically covered with the sound insulating member made of foamed synthetic resin, and the outer periphery of the sound insulating member is covered concentrically with the outer tube made of synthetic resin. Thus, an integrated composite pipe can be easily manufactured.

[0013]

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 first embodiment of a composite pipe according to the present invention. This composite pipe is a synthetic resin cylindrical inner pipe 1 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 and a heat medium flows.
Is concentrically covered with 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. .

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

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

The composite pipe is formed by extruding the inner pipe 1 and extruding the foamed synthetic resin material on the outer periphery thereof while foaming the foamed synthetic resin material to form the sound insulating and heat insulating member 4 to be integrated.

FIG. 2 shows a second embodiment of the composite pipe of the present invention. This composite pipe is a synthetic resin cylindrical inner pipe 1 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 and a heat medium flows.
Is concentrically covered with a cylindrical synthetic sound insulation member 4 made of a foamed synthetic resin having a required thickness so as to obtain a desired sound insulation insulation performance. Is concentrically covered with a cylindrical outer tube 2 made of a synthetic resin having a required thickness so as to obtain a desired strength, and integrated.

In the composite pipe of this embodiment, the inner pipe 1 and the outer pipe 2 are arranged at equal intervals, for example, at 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 insulation and heat insulating member 4 is made of an arbitrary 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 the use.

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

In this composite tube, the inner tube 1, the outer tube 2 and the ribs 3 are extruded, and a foamable synthetic resin material is filled between the inner tubes 1 and 2 and the ribs 3 to form a foam. The sound insulation and heat insulating member 4 is formed and integrated.

FIG. 3 shows a third embodiment of the composite pipe of the present invention. This composite pipe is a square tubular inner pipe 1 made of 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. Of the sound insulating and heat insulating member 4 is concentrically covered with a square cylindrical sound insulating and insulating member 4 made of a foamed synthetic resin having a required thickness so as to obtain the desired sound insulating and heat insulating performance. The outer periphery is concentrically covered with a synthetic resin square tubular outer tube 2 having a required thickness so as to obtain a desired strength, and is integrally formed. The material of the inner tube 1, the outer tube 2 and the sound insulating member 4 of this composite tube, the shape of the rib 3 connecting the inner tube 1 and the outer tube 2, and the like are the same as those of the second 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. The composite pipe is designed so that a fluid such as a drain pipe, a water supply pipe or a refrigerant / heat medium flows. 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.

[0027]

According to the composite pipe of the first aspect,
The outer circumference of the inner tube made of synthetic resin is concentrically covered with a sound insulating member made of foamed synthetic resin and integrated, so that fluids such as drain pipes, water supply pipes, and refrigerants and heat medium flow. By simply installing the pipe as an insulated pipe, there is no need for sound insulation and heat insulation work after the pipe is installed at the site, and the uniform and stable sound insulation and heat insulation performance is obtained in conjunction with the integration of the inner pipe and the sound insulation and heat-insulating member during manufacturing. And workability is good, and construction can be performed easily.

According to the composite pipe of the present invention, the outer circumference of the inner pipe made of synthetic resin is concentrically covered with the sound insulating and heat insulating member made of foamed synthetic resin, and the outer circumference of the sound insulating and heat insulating member is also provided. Is concentrically covered with an outer pipe made of synthetic resin and integrated, so it can be installed on site simply by installing it as a drain pipe, a water supply pipe, or a pipe through which fluids such as refrigerant and heat medium flow. This eliminates the need for sound insulation and heat insulation work after piping, and in conjunction with the fact that the inner and outer pipes and the sound insulation and heat insulating members are integrated at the time of manufacture, uniform and stable sound insulation and heat insulation performance can be obtained. In addition, the workability is good and the construction can be easily performed.

Further, according to the composite pipe of the third aspect of the present invention, a composite pipe having high strength can be obtained by connecting the inner pipe and the outer pipe with the rib.

According to the method for manufacturing a composite pipe according to the fourth aspect of the present invention, the inner pipe and the outer pipe are extruded and the foamable synthetic resin material is filled between the inner pipe and the outer pipe. By foaming this to form a sound insulating and heat insulating member, the outer periphery of the inner tube made of synthetic resin is concentrically covered with a sound insulating and heat insulating member made of foamed synthetic resin, and the outer periphery of the sound insulating and heat insulating member is made of synthetic resin. A composite tube that is concentrically covered with an outer tube made of stainless steel and integrated can be easily manufactured.

[Brief description of the drawings]

1A and 1B show a first embodiment of a composite pipe of the present invention, wherein FIG. 1A is a transverse sectional view and FIG. 1B is a longitudinal sectional view.

FIGS. 2A and 2B show a second embodiment of the composite pipe of the present invention, wherein FIG. 2A is a transverse sectional view and FIG. 2B is a longitudinal sectional view.

FIG. 3 is a cross-sectional view of a third embodiment of the composite pipe of the present invention.

[Explanation of symbols]

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

[Procedure amendment]

[Submission date] April 16, 1999

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

[Title of the Invention] Method of manufacturing composite pipe

[Claims]

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, an outer pipe, and a rib connecting the inner pipe and the outer pipe;
A foamable synthetic resin material is filled between the inner tube, the outer tube and the ribs, and foamed to form a sound insulating and heat insulating member that is concentrically integrated with the inner tube, the outer tube and the ribs at the time of manufacture. It is characterized by doing.

[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. Further, since the inner pipe and the outer pipe are connected by the rib, 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.

[Description of Signs] 1 Inner pipe 2 Outer pipe 3 Rib 4 Sound insulation and heat insulating member ───────────────────────────────── ────────────────────

[Procedure amendment]

[Submission date] August 18, 1999

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

[Title of the Invention] Method of manufacturing composite pipe

[Claims]

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.

[Description of reference numerals] 1 inner pipe 2 outer pipe 3 rib 4 sound insulation and heat insulating member

Claims (4)

[Claims] 1. A composite pipe, wherein the outer circumference of an inner pipe made of synthetic resin is concentrically covered with a sound insulating member made of foamed synthetic resin to be integrated. 2. The outer periphery of a synthetic resin inner tube is concentrically covered with a foamed synthetic resin sound insulating and heat insulating member, and the outer periphery of the sound insulating and heat insulating member is concentrically covered with a synthetic resin outer tube. A composite tube characterized by being coated and integrated. 3. The composite pipe according to claim 2, wherein the inner pipe and the outer pipe are connected by a rib. 4. Extrusion molding of the inner tube and the outer tube,
A method for manufacturing a composite pipe, comprising filling a foamable synthetic resin material between an inner pipe and an outer pipe, and foaming the foamed synthetic resin material to form a sound insulating member.