JP2005172168A - Pipe set for hot water circulation piping - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe set for hot water circulation piping preventing corrosion at metal parts in a heat source machine or the like, with pipes themselves protected from corrosion, by minimizing penetration of oxygen into hot water inside the pipes from open air, and with heat of the going pipe hardly transferred to the return pipe to restrict energy loss. <P>SOLUTION: On an outer circumferential surface of a metal-reinforced thermoplastic resin pipe comprising an inner layer of thermoplastic resin and a metal layer on the outer side of it, or an inner pipe of thermoplastic resin, an outer pipe of thermoplastic resin having elasticity with a plurality of linear ribs protruded on an inner circumferential surface in parallel to the axial direction is provided, with an air layer formed by the ribs in a gap between the inner pipe and the outer pipe. Two or more such coated pipes are combined with each other roughly in parallel, and a double-layered film comprising thermoplastic resin layer and a metal layer is wound around the combined pipes. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a pipe for hot water circulation piping. More specifically, the present invention relates to a hot water circulation pipe for use in an air conditioning system and a hot water circulation pipe set for use in a water supply / hot water supply pipe, which is applied to a detached house, an apartment house, or a commercial building.

  Conventionally, hot water circulation pipes used in single-family houses, apartment houses, commercial buildings, etc., and hot water circulation pipes used for water supply and hot water supply pipes are supplied in the form of multiple pipes arranged side by side. It is used as a connecting pipe that connects the heat source machine and the radiator. In many cases, two or three pipes are juxtaposed, and the forward pipe from the heat source unit to the radiator and the return pipe from the radiator are used as a set.

  Examples of the hot water circulation pipe include a hot water type floor heating system that circulates hot water under the floor and heats it with hot water heat, a hot water type heating system that heats using the heat of the hot water panel, a bathtub reheating system, and the like. For example, in a hot water floor heating system, hot water heated to a predetermined temperature by a heat source device is supplied to the heat radiating floor panel through the forward pipe, and hot water that has been radiated by the heat radiating floor panel and has become low temperature is supplied to the return pipe. It is returned to the heat source machine, heated again by the heat source machine, and circulated to the heat radiating floor panel. Moreover, in a bathtub additional cooking system, the hot water in the bathtub which became cold and became low temperature is sent to a heat source machine through a return pipe, and after heating with a heat source machine, it is made to circulate in a bathtub again through an outgoing pipe.

  As a pipe used for these hot water circulation pipes, two plastic pipes coated with a coating thin film are arranged in the center in a heat insulation coated pipe formed by coating the outer surface of a plastic pipe with a heat insulating material. A heat insulating material layer is formed on the outer surface, and the outer periphery of the heat insulating material layer is covered with a skin film, or these two plastic tubes are covered with a foamed plastic film. A heat insulating cladding tube is known (for example, refer to Patent Document 1).

  There is also known a heating fluid conveyance pipe for a Saya pipe construction method in which a film having a low thermal emissivity is provided in close contact with the outer surface of a resin heating fluid conveyance pipe that is inserted and piped inside the sheath pipe (for example, a patent Reference 2).

  Furthermore, a piping material is known in which a heat-insulating piping is tightly tightened and integrated with a water supply piping, and an aluminum coating tape and a heat insulating material are wound around this. (For example, refer to Patent Document 3).

  The pipes of Patent Document 1 and Patent Document 2 are pipes for cold / hot water or water / hot water supply pipes in the case of pipes for the return / return pipes of cold / hot water in a centralized cooling / heating system, or for water supply / hot water supply to the same place. Insulators are interposed between the two, and these are collectively covered with a heat insulating material. As these pipes, pipes in which a film having a thickness of about 20 μm and the like are laminated on the outer surface of a crosslinked polyethylene pipe are used, and for example, polyethylene foam is used as a heat insulating material layer on the outer face. The structure is covered.

  The coated thin film used in Patent Document 1 is used for the purpose of fixing integrally so that the juxtaposed pipes are not displaced, and the aluminum coating tape used in Patent Document 3 is a juxtaposed pipe. It is used for the purpose of deforming the tube by winding the outside of each other and tightening tightly. Therefore, all are selected and used as materials having excellent tensile strength.

The pipes of Patent Document 3 are used by placing heating hot water supply pipes, return pipes, hot water supply / water supply pipes in close contact with each other, and covering all the pipes with a heat insulating material. It is necessary to increase the heat exchange efficiency because the purpose is to prevent the temperature of hot water in the hot water supply / water supply pipe from decreasing by bringing the pipes into contact with each other. For this reason, a metal pipe such as copper is used as the hot water supply / water supply pipe. A thermoplastic resin pipe is partly used at a place where flexibility and the like should be taken into consideration during construction.
Japanese Patent Laid-Open No. 11-82875 Japanese Utility Model Publication No. 61-594 Japanese Utility Model Publication No. 5-94652

  However, in the cross-linked polyethylene pipes of Patent Documents 1 and 2, there is no particular problem when the hot water or the like is not returned to the original by using it at the water supply destination. Since oxygen in the atmosphere permeates through the wall of the hot water supply pipe or the return pipe and dissolves in the fluid, the oxygen dissolved in the internal warm water will displace the metal parts such as the heat source machine when used for a long time. There is a risk of oxidative corrosion. Alternatively, when a metal tube such as a copper tube is used, there is a concern that the inner wall surface of the copper tube oxidizes and swells, narrowing the flow path and increasing the pressure loss during water supply over the long term.

  Moreover, in the case of the metal pipe of patent document 3, in order to heat-exchange by making an outgoing pipe and a return pipe contact, it is piping on the assumption that the hot water supply temperature falls, especially from a heat source machine to a radiator. When the length of the pipe is long, heat radiation from the forward pipe to the return pipe increases, resulting in energy loss that cannot be ignored.

    In view of the present situation, the present inventors can prevent the corrosion of metal parts such as a heat source machine by making the oxygen permeation from the atmosphere to the warm water inside the pipe extremely small, and the pipe itself does not corrode, or the outgoing pipe It is to provide a pipe set for hot water circulation piping with less energy loss due to the loss of heat from the return pipe.

  In order to solve the above problems, a hot water circulating pipe set (invention 1) according to claim 1 of the present invention is a thermoplastic resin pipe reinforced with a metal layer provided outside an inner layer made of a thermoplastic resin. Two or more of these are bundled so that each is substantially parallel, and the bundled tube is covered with a multilayer film composed of a thermoplastic resin layer and a metal layer.

  The pipe set for hot water circulation piping according to claim 2 (invention 2) is a thermoplastic having elasticity in which a plurality of linear ribs are projected on the inner surface side in parallel with the axial direction on the outer surface of the inner tube of the thermoplastic resin. A bundled tube in which two or more cladding tubes each provided with an outer tube of resin and in which the gap between the inner tube and the outer tube is formed into an air layer by the plurality of ribs are approximately parallel to each other A multilayer film composed of a thermoplastic resin layer and a metal layer is wrapped around and coated.

  The invention according to claim 3 (invention 3) is the pipe set for hot water circulation piping according to claim 1 or 2, wherein the bundled pipes are encapsulated with a heat insulating material.

  The metal-reinforced thermoplastic resin tube used in the present invention 1 is made of heat such as vinyl chloride resin, polyethylene, crosslinked polyethylene, polypropylene, acrylic resin, fluorine resin, amide resin, silicon resin, polyethylene terephthalate, polybutene, etc. It is a tube having a tube wall in which a layer made of a metal such as aluminum, iron, copper, stainless steel, and an aluminum alloy is laminated outside a layer made of a plastic resin.

  The inner surface of the tube is a thermoplastic resin layer in order to suppress corrosion. That is, it is a two-layer tube of an inner surface thermoplastic resin and an outer surface metal, but in order to suppress heat radiation to the outer surface of the tube, a three-layer tube having a thermoplastic resin on the outer surface and a metal as an intermediate layer may be used. good. Furthermore, it may be a multi-layer pipe having many resin layers on the inner surface and / or outer surface. The inner layer and outer layer thermoplastic resins may be the same or different.

  Two or more metal-reinforced thermoplastic resin tubes are bundled so as to be substantially parallel to each other, and a multilayer film of metal and thermoplastic resin is wound around and coated.

  The multilayer film is used on the outside of the bundled tube to protect the surface of the bundled tube, further reduce oxygen transmission and reduce the amount of radiant heat from the tube itself. As a multilayer film, polyvinyl chloride, polyethylene, polypropylene, ethylene / vinyl acetate copolymer resin, acrylic resin, fluorine resin, polyethylene terephthalate, polybutene, or a film or sheet stretched from these, Examples thereof include a multilayer film or sheet in which metal foils such as aluminum, silver, gold, copper, iron, stainless steel, and brass are laminated. In particular, a laminated film of an aluminum foil and a stretched polyethylene terephthalate film can be suitably used from the viewpoints of cost and ease of processing.

  The cladding tube of the present invention 2 is made of vinyl chloride resin, polyethylene, crosslinked polyethylene, polypropylene, acrylic resin, fluorine resin, amide resin, silicon resin, polyethylene terephthalate, thermoplastic resin such as polybutene, or the like, or the metal reinforced The outer surface of the inner tube made of thermoplastic resin is covered with an outer tube made of thermoplastic resin having elasticity such as soft vinyl chloride resin, natural rubber, synthetic rubber or the like.

  A plurality of ribs are provided on the inner surface of the outer tube along the tube axis. The rib ridge line is in contact with the outer surface of the inner tube. Therefore, the inner surface of the outer tube and the outer surface of the outer tube are separated by the ribs to form an air layer. This air layer has both the heat retaining effect of the inner tube and the effect of preventing damage due to an external impact on the inner tube together with the rib.

  Usually, the number of ribs is preferably 6 or more. If it is six or less, the tube wall of the outer tube may fall into the space and come into contact with the outer surface of the inner tube. However, if the amount is too large, the amount of heat that travels along the ribs increases and the heat retention effect decreases. This cladding tube is manufactured by inserting the inner tube into an outer tube with an inner rib.

  A total of two or more cladding tubes are bundled so that each is substantially parallel, and a multilayer film is wound around and coated. Since the multilayer film used may be the same as that of Invention 1, it will not be described again.

  In the invention 3, the outside of the bundled tube of the invention 1 or the invention 2 is encapsulated with a heat insulating material, and the outermost layer is wrapped with a multilayer film to cover it. The heat insulating material may be encapsulated for each individual tube, or may be encapsulated so as to cover the entire bundled tube. Examples of the heat insulating material include foamed thermoplastic resins such as foamed crosslinked polyethylene, foamed polypropylene, foamed acrylic resin, and foamed urethane resin, and glass wool.

  In order to fix the heat insulating material or to make the tube easy to handle, a protective layer may be covered for each of the heat insulating materials provided by wrapping each individual tube. As the protective layer, polyvinyl chloride, polyethylene, polypropylene, ethylene / vinyl acetate copolymer resin, acrylic resin, fluorine resin, polyethylene terephthalate, polybutene, or a film or sheet, or a film or sheet obtained by stretching them is suitable. Can be used for

  The outermost surface of the provided heat insulating material is covered with a multilayer film. If the insulation sheet is made of foamed thermoplastic resin or glass wool, etc., where the bubbles are open cells, the insulation is fixed and easy to handle, and water or the like enters the insulation to reduce the insulation effect. It is desirable to be provided to prevent this. In addition, if the multilayer film is a closed-cell foam film or sheet, it is preferable that the heat insulating effect is further improved, and that embossing is performed, which makes it difficult to slip during handling.

  In invention 1, invention 2 or invention 3, in any of the inventions, the bundled pipes are metal-reinforced, whether they are all metal-reinforced thermoplastic resin pipes or all coated pipes. Further, a combination of a thermoplastic resin tube and a cladding tube may be used, and any of them may be a hot water supply tube or a return tube.

  In addition, in the cladding tube, when the outer side is a soft outer tube, if there is a bent part at the time of construction, the outer tube on the back side of the bent may sag, or contact with the thermoplastic resin tube which is the inner tube There is a risk of the airway becoming thinner. Therefore, a heat insulating material may be provided also on the outer surface of the cladding tube in order to reduce the sag of the tube and further improve the heat retaining effect. Since the kind of the heat insulating material used and the provision of the coating on the outside thereof are the same as described above, the repetitive description will be omitted.

  In the invention 1, since the metal-reinforced thermoplastic resin pipe is provided with a metal layer on the pipe wall, oxygen does not permeate, and oxygen permeation from the atmosphere into the warm water inside the pipe becomes extremely small. Corrosion of metal parts such as heat source equipment can be prevented and the tube itself does not corrode. Therefore, by bundling metal-reinforced thermoplastic resin pipes and wrapping them with a multilayer film of metal and thermoplastic resin, the metal parts in the pipes and the pipes themselves do not corrode for a long time and are supplied. This is a pipe set for hot water circulation piping with little temperature drop of hot water.

  In the invention 2, the outer tube of the thermoplastic resin is provided with an outer tube made of a soft thermoplastic resin to form a double tube, and the cladding tube has a structure in which an air layer is provided between the inner tube and the outer tube. Therefore, even if the tubes come into contact with each other, the heat transfer from one tube to the other tube is small, and the heat from the forward tube is not easily taken away by the return tube, resulting in a hot water circulation piping tube set with low energy loss. .

  In the invention 3, the bundled tube of the invention 1 or the invention 2 is covered with a heat insulating material, and the outer side of the heat insulating material is covered with a multilayer film of a metal and a thermoplastic resin. It becomes a pipe set for hot water circulation piping with little decrease.

  Next, the present invention will be described with reference to the drawings. FIG. 1 is a partially cutaway perspective view of an example of a pipe set for hot water circulation piping in which two metal-reinforced thermoplastic resin pipes are used. FIG. 2 is a partially cutaway perspective view of an example in which a cladding tube whose inner tube is a cross-linked polyethylene tube and a cladding tube whose inner tube is a metal-reinforced thermoplastic resin tube are used one by one. FIG. 3 is an example of a pipe set for hot water circulation piping in which a heat insulating material is used, and (a) is a partially cutaway perspective view of an example in which the heat insulating material is used for two metal-reinforced thermoplastic resin tubes. (B) is a partially cutaway perspective view of an example in which a heat insulating material is used for two cladding tubes having different inner tubes. FIG. 4 is a partially cutaway perspective view of still another example of a pipe set for circulating hot water piping. FIG. 4A is an example in which one metal-reinforced thermoplastic resin pipe and one cladding pipe are used. Partially cutaway perspective view, (b) is a partially cutaway perspective view of an example in which a heat-insulating material is used by bundling one metal-reinforced thermoplastic resin tube and one cladding tube, (c) It is a partially cutaway perspective view of an example in which a metal-reinforced thermoplastic resin tube wound with a heat insulating material and a cladding tube wound with a heat insulating material are used. The total number of thermoplastic resin tubes or cladding tubes reinforced with metal may be three or more, but in the illustrated example, all of them will be described in the case of two.

  The pipe set (1) for hot water circulation piping in FIG. 1 is one in which two metal-reinforced thermoplastic resin pipes (2) are bundled and wrapped with a multilayer film (51). The thermoplastic resin pipe (2) reinforced with metal is a multilayer pipe in which a cross-linked polyethylene layer is laminated as the thermoplastic resin layer (21) and an aluminum foil is laminated as the metal layer (22), and the innermost layer is cross-linked polyethylene. Layer (21). The outermost layer may be a thermoplastic resin layer in order to reduce heat radiation to the outside of the tube (2).

  A plurality of metal-reinforced thermoplastic resin pipes (2) (two in this example) are bundled and the outer side is covered with a multilayer film (51) to form a pipe set (1) for hot water circulation piping. Yes. The multilayer film (51) is a composite film having a thickness of 75 μm in which an aluminum foil and a stretched polyethylene terephthalate film are laminated. The method of coating the multilayer film (51) is not particularly limited. For example, a composite film formed into an elongated ribbon shape and coated with an adhesive or the like on the back surface is spirally wound around a bundled tube and wound. And a method of covering the entire tube bundle by overlapping adjacent sides.

  In addition, as the multilayer film (51), you may use the multilayer film which gave foaming resin together, and gave the heat insulation, or gave the surface the embossing of a non-slip | skid.

  The pipe set (1) for hot water circulation piping in FIG. 2 is one in which two cladding pipes (3) are bundled and covered with a multilayer film (51). In the cladding tube (3), a thermoplastic polyethylene crosslinked polyethylene tube is inserted as an inner tube (31) into a soft polyvinyl chloride tube as an outer tube (32), and the outer tube (32) has an inner surface. Ribs (321) are provided along the tube axis direction. The inner pipe (31) and the outer pipe (32) are separated by a rib (321), and this gap serves as an air layer (33) and has a heat insulating effect. It also serves as protection.

  A plurality (two in this example) of the cladding tube (3) are bundled, and the outer side is covered with a multilayer film (51) to form a tube set (1) for hot water circulation piping. The multilayer film (51) is the same as described above, and is wound around and coated on the outside of the bundled tube by the same method as described above.

  The pipe set for hot water circulation piping (1) in FIG. 3 (a) is made by bundling two metal-reinforced thermoplastic resin pipes (2) and providing a heat insulating material (5) on the outside of the bundled pipes. The whole is covered with a multilayer film (51).

  The heat insulating material (5) is a crosslinked polyethylene foam pipe having a foaming ratio of 20 times, and a thermoplastic resin pipe (2) reinforced with metal is bundled and inserted therethrough. The outer side is covered with a multilayer film (51) to protect water from entering the heat insulating material (5) layer. The multilayer film is the same as the multilayer film (51) described above, and may be wound around the outside of the bundled tube by the same method.

  FIG. 3B shows a pipe for hot water circulation piping in which two cladding tubes (3) are bundled, a heat insulating material (5) is provided outside the bundled tubes, and the whole is covered with a multilayer film (51). It is an example of a set. A heat insulating material (5), its attachment method, and a multilayer film (51) are the same as the above-mentioned.

  The pipes to be bundled are not necessarily the same kind of pipes. For example, FIG. 4 (a) is an example of a hot water circulation piping pipe set in which a metal-reinforced thermoplastic resin pipe (2) and a cladding pipe (3) are bundled and covered with a multilayer film (51). FIG. 4B shows an example of a metal-reinforced thermoplastic resin pipe (2) and a cladding pipe (3) wound with a heat insulating material (5) and covered with a multilayer film (51) around the outside. FIG. 4 (c) shows a bundle of a metal-reinforced thermoplastic resin tube (2) wound with an individual heat insulating material (4) and a cladding tube (3) wound with an individual heat insulating material (4). It is an example of what wound and coat | covered the multilayer film (51). In addition, in FIG.4 (c), although the protective layer (41) is provided in the outer surface of the separate heat insulating material (4), as above-mentioned, it is not necessarily required.

It is a partially cutaway perspective view of an example of a pipe set for hot water circulation piping in which two metal-reinforced thermoplastic resin pipes of the invention 1 are used. FIG. 5 is a partially cutaway perspective view of an example in which a cladding tube in which the inner tube of the invention 2 is a cross-linked polyethylene tube and a cladding tube in which the inner tube is a metal-reinforced thermoplastic resin tube are used one by one. It is an example of the pipe set for hot water circulation piping in which the heat insulating material of the invention 3 was used. (A) is a partially cutaway perspective view of an example in which a heat insulating material is used in two metal-reinforced thermoplastic resin tubes. (B) It is a partially notched perspective view of an example in which the heat insulating material was used for two cladding tubes with different inner tubes. It is a partially cutaway perspective view of another example of the pipe set for hot water circulation piping. (A) It is a partially cutaway view of an example in which one metal-reinforced thermoplastic resin tube and one coated tube are used. (B) It is a partially cutaway perspective view of an example in which one metal-reinforced thermoplastic resin tube and one cladding tube are bundled and a heat insulating material is used. (C) It is a partially cutaway perspective view of an example in which a metal-reinforced thermoplastic resin tube wound with a heat insulating material and a cladding tube wound with a heat insulating material are used.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Set of pipes for hot water circulation pipe 2 Metal-reinforced thermoplastic resin pipe 21 Thermoplastic resin layer 22 Metal layer 3 Coated pipe 31 Inner pipe made of thermoplastic resin 32 Outer pipe made of soft thermoplastic resin 321 Rib 4 Individual heat insulation Material 41 Protective layer 5 Heat insulation material 51 Multi-layer film

Claims (3)

  Two or more thermoplastic resin pipes that are reinforced by providing a metal layer on the outside of the inner layer made of thermoplastic resin are bundled so that each is substantially parallel, and the thermoplastic resin layer and the metal are bundled in the bundled pipe. A pipe set for hot water circulation piping, wherein a multilayer film composed of layers is wound and covered.   On the outer surface of the inner tube of thermoplastic resin, there is provided an outer tube of thermoplastic resin having elasticity in which a plurality of linear ribs protrudes on the inner surface side in parallel with the axial direction, and the gap between the inner tube and the outer tube 2 or more of the cladding tubes made into an air layer by the plurality of ribs are bundled so that each is substantially parallel, and a multilayer film composed of a thermoplastic resin layer and a metal layer is wound around the bundled tubes. A pipe set for circulating hot water piping characterized by covering. The pipe set for hot water circulation piping according to claim 1 or 2, wherein the bundled pipes are encapsulated with a heat insulating material.

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