JP2016017314A - Water supply and hot-water supply piping and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water supply and hot-water supply piping that is expandable and flexible and capable of maintaining a contact between a running-water pipe and a heater guide pipe and enhancing heat transmission property between the two, along with a manufacturing method for the piping.SOLUTION: A water supply and hot-water supply piping 1 includes: a running-water pipe 2; a heater guide pipe 3 for inserting and installing a heater inside, having a bellows-like outer peripheral surface 32 with concave and convex parts formed in an axial direction; a binding tape 4 wound around the running-water pipe 2 and the heater guide pipe 3 while maintaining a contact between the two, for binding the two; and a tubular sheath material 5 that covers the running-water pipe 2 and the heater guide pipe 3 bound by the binding tape 4 from outside. The binding tape 4 is wound around an outer peripheries of the running-water pipe 2 and the heater guide pipe 3, the tape being in a state that bites into a concave part 321 on the outer peripheral surface 32 of the heater guide pipe 3.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a water supply / hot water supply pipe and a method of manufacturing the same.

  2. Description of the Related Art Conventionally, a water supply / hot water supply pipe including a water pipe, a heater guide pipe through which a heater is inserted and disposed, and a cylindrical covering material covering the outside of the water pipe and the heater guide pipe is known (patent) Reference 1). The covering material is formed of a synthetic resin foam, particularly a polyolefin foam such as polyethylene or polypropylene, and prevents damage and condensation of the water flow pipe and the heater guide pipe, thereby improving heat insulation and heat retention. The flowing water pipe and the heater guide pipe are covered with the covering material, so that they are in contact with each other inside the covering material.

JP2013-189860A

  However, since the long water supply / hot water supply pipe is coiled after manufacture, the covering material is compressed in the vertical direction by its own weight. In addition, after the coil is wound, the pipe expands so as to extend straight, and the covering material is compressed radially outward. Further, as the products are stacked, the covering material is compressed in the vertical direction by the load.

  When the covering material is compressed in this way, the thickness of the covering material is reduced and the inner diameter of the covering material is increased. For this reason, a portion where the contact between the water pipe and the heater guide pipe is released is generated, and the heat of the heater is hardly transmitted from the heater guide pipe to the water pipe. That is, the heat transfer between the flowing water pipe and the heater guide pipe is lowered.

  The present invention has been made in view of such a background, and while having elasticity and flexibility, it is possible to maintain contact between the flowing water pipe and the heater guide pipe and improve heat transfer between them. -It is intended to provide a hot water supply pipe and its manufacturing method.

  One aspect of the present invention includes a water pipe, a heater guide pipe having a bellows-shaped outer peripheral surface provided with projections and depressions along the axial direction, the heater being inserted and arranged inside, the water pipe and the heater In a state where the guide tube is in contact, the outer periphery of the flowing water tube and the heater guide tube is wound around the outer periphery of the flowing water tube and the heater guide tube, and the outside of the flowing water tube and the heater guide tube bound by the binding tape is covered. And the binding tape is wound around the outer periphery of the water flow tube and the heater guide tube in a state of biting into the recess of the outer peripheral surface of the heater guide tube. It is in the piping for water supply and hot water.

  In another aspect of the present invention, the flowing water pipe has a bellows-shaped outer peripheral surface provided with irregularities along the axial direction, and is bundled with a heater guide pipe for inserting and arranging the heater inside. A bundling step in which a bundling tape is wound around the outer periphery of the water flow pipe and the heater guide pipe and the both are in contact with each other, and the outside of the water flow pipe and the heater guide pipe bundled by the bundling tape is covered with a coating material. A water supplying water characterized in that, in the bundling step, the bundling tape is wound around the outer periphery of the water flow tube and the heater guide tube while the bundling tape is bitten into a recess in the outer peripheral surface of the heater guide tube. -It is in the manufacturing method of hot water supply piping.

  In the water supply / hot water supply pipe, a bundling tape is wound around the outer periphery of the flow water pipe and the heater guide pipe in a state where the flow water pipe and the heater guide pipe are in contact with each other, and both are bound by the bundling tape. Further, the binding tape is wound in a state of being bitten into the concave portion of the outer peripheral surface of the bellows-like heater guide tube.

  Therefore, even if the covering material is compressed for the reasons described above, the thickness of the covering material is reduced, and the inner diameter of the covering material is increased, the contact between the flowing water pipe and the heater guide pipe can be reliably maintained. Further, the axial displacement between the flowing water pipe and the heater guide pipe hardly occurs. Thereby, heat transfer between a flowing water pipe and a heater guide pipe is fully securable.

  Further, the heat of the heater is directly transmitted from the heater guide tubes in contact with each other to the water flow tube, and is indirectly transmitted from the heater guide tube to the water flow tube via the binding tape. Therefore, the heat of the heater can be efficiently transmitted from the heater guide tube to the flowing water tube. Thereby, the heat transfer between a flowing water pipe and a heater guide pipe can be improved.

  In addition, since the binding tape bites into the recesses on the outer peripheral surface of the heater guide tube, the heat collecting area of the binding tape is increased and the above-described heat transfer effect can be further enhanced. Moreover, since a running water pipe and a heater pipe are arrange | positioned in the space divided by the binding tape, the heat-transfer effect through the space is also acquired. Thereby, the heat transfer between a flowing water pipe and a heater guide pipe can further be improved.

  Further, the outer peripheral surface of the heater guide tube is formed in a bellows shape with irregularities along the axial direction. Therefore, the stretchability and flexibility of the heater guide tube can be improved. Thereby, the elasticity and flexibility of the entire water supply / hot water supply pipe including the heater guide pipe can be improved, and for example, workability during coil winding and installation after manufacture can be improved.

  The manufacturing method of the said water supply / hot-water supply piping performs a bundling process and a coating | coated process in order. That is, in the bundling step, a bundling tape is wound around the outer periphery of the bundled running water pipe and the heater guide pipe, and bundling is performed in a state where both are in contact with each other. At this time, the binding tape is wound while being bitten into the concave portion of the outer peripheral surface of the bellows-like heater guide tube. In the covering step, the outer sides of the flowing water pipe and the heater guide pipe that are united together are covered with a covering material.

  This makes it possible to maintain the contact between the flowing water pipe and the heater guide pipe and improve the heat transfer between them while having the above-mentioned water supply and hot water supply pipes, that is, elasticity and flexibility. Piping can be manufactured easily. In particular, since the flowing water pipe and the heater guide pipe, which are previously bound with a binding tape, are covered with a covering material, the covering operation becomes very easy.

  Thus, according to the present invention, while having elasticity and flexibility, maintaining the contact between the flowing water pipe and the heater guide pipe, and improving the heat transfer between them, A manufacturing method thereof can be provided.

  Further, in the water supply / hot water supply pipe, the binding tape may be made of metal. In this case, since the heat conductivity of the binding tape is improved, the heat of the heater can be efficiently transmitted from the heater guide tube to the water pipe through the binding tape. Thereby, the heat transfer between a flowing water pipe and a heater guide pipe can further be improved.

  In addition, as a metal binding tape, the aluminum tape etc. of the thin film (for example, about 10-40 micrometers in thickness) which have aluminum as a main component can be used, for example. In this case, the above-described effects can be obtained, and winding around the flowing water pipe and the heater guide pipe is easy.

  Further, the binding tape may be non-adhesive. That is, if the binding tape is sticky, the stickiness remains on the surface of the water pipe, and when the water pipe is connected to a joint or the like, foreign matter may be caught and the sealing performance may be impaired. Can be avoided.

  Further, in the method for manufacturing a water supply / hot water supply pipe, in the covering step, the outside of the flowing water pipe and the heater guide pipe bound by the binding tape is wound into a tubular shape with the sheet-like covering material, You may join the edge parts of the width direction of a coating | covering material by heat sealing | fusion. In this case, for example, when the coating material is heat-sealed, hot air is applied to the joining portion to heat the bonding material, but since the binding tape is wound around the outer periphery of the water pipe and the heater guide pipe, Direct contact with the heater guide tube can be prevented. Thereby, it can prevent that the surface of a flowing water pipe or a heater guide pipe melts and adheres to a covering material.

  Note that the binding tape preferably has sufficient heat resistance in order to obtain the above-described effects. For example, it is preferable that the material constituting the binding tape has a high melting point (at least higher than the thermal fusing temperature).

It is a perspective view which shows the piping for water supply and hot water supply in Embodiment 1. FIG. It is a side view which shows the piping for water supply / hot-water supply in Embodiment 1. FIG. (A) is a fragmentary sectional view which shows the partial cross section of the piping for water supply and hot water supply in Embodiment 1, (B) is sectional drawing which expands and shows the A part of (A) in detail. . It is sectional drawing which shows piping for water supply / hot-water supply in Embodiment 1. FIG. It is explanatory drawing which shows the manufacturing apparatus which manufactures the piping for water supply and hot water supply in Embodiment 1. FIG. It is explanatory drawing which shows the bundling process which binds a flowing water pipe and a heater guide pipe | tube in Embodiment 1 with a bundling tape. It is explanatory drawing which shows the process of sticking an adhesive tape on the bundling tape which bound the flowing water pipe and the heater guide pipe in Embodiment 1. FIG. It is explanatory drawing which shows the coating process which coat | covers the outer side of the flowing water pipe | tube and heater guide pipe | tube bound by the binding tape in Embodiment 1 with a coating | covering material.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Embodiment 1)
First, the water supply / hot water supply piping of this embodiment will be described.

  As shown in FIGS. 1 to 4, the water supply / hot water supply pipe 1 of the present embodiment has a flowing water pipe 2 and a bellows-like outer peripheral surface 32 provided with irregularities along the axial direction, and the heater 30 is disposed inside. A heater guide tube 3 for being inserted into and disposed, and a bundling tape 4 wound around the outer periphery of the water flow tube 2 and the heater guide tube 3 in a state where the water flow tube 2 and the heater guide tube 3 are in contact with each other. The water pipe 2 bound by the binding tape 4 and the cylindrical covering material 5 covering the outside of the heater guide pipe 3 are provided. The binding tape 4 is wound around the outer circumferences of the flowing water pipe 2 and the heater guide pipe 3 in a state of being bitten into the recesses 321 of the outer peripheral surface 32 of the heater guide pipe 3. This will be described in detail below.

  As shown in FIGS. 1 to 4, in the water supply / hot water supply pipe 1, the flowing water pipe 2 is for circulating water. The flowing water pipe 2 is made of, for example, a synthetic resin such as crosslinked polyethylene or polybutene. The flowing water pipe 2 is formed thicker than the heater guide pipe 3 so as to withstand a certain amount of water pressure (for example, 1.75 MPa or more).

  As shown in the figure, the heater guide tube 3 is for inserting and arranging the heater 30 (FIG. 4) inside. The heater guide tube 3 is made of, for example, a synthetic resin such as polyethylene or polypropylene. The heater guide tube 3 is formed with a smaller diameter than the flowing water tube 2. The heater guide tube 3 is formed in a bellows shape in which irregularities are repeatedly provided along the axial direction, and has elasticity and flexibility. In the present embodiment, the inner peripheral surface 31 and the outer peripheral surface 32 of the heater guide tube 3 are both formed in a bellows shape.

  As shown in FIG. 4, the heater 30 inserted and arranged inside the heater guide tube 3 is for transmitting heat to the water pipe 2 by generating heat and heating water in the water pipe 2. As the heater 30, for example, a self-temperature control type heater, a heater with a thermostat, or the like can be used.

  As shown in FIGS. 1 to 4, the flowing water pipe 2 and the heater guide pipe 3 are arranged side by side in contact with each other. A belt-like binding tape 4 is wound around the outer periphery of the water flow pipe 2 and the heater guide pipe 3 in a spiral shape. The flowing water pipe 2 and the heater guide pipe 3 are in a state of being bound by a wound binding tape 4.

  As shown in FIGS. 3 (A) and 3 (B), the binding tape 4 is wound around the outer circumferences of the water flow pipe 2 and the heater guide pipe 3 in a state of being bitten into the recess 321 of the outer peripheral surface 32 of the heater guide pipe 3. ing. In FIG. 3, a part of the water supply / hot water supply pipe 1 (flow water pipe 2, heater guide pipe 3, binding tape 4) is shown as a cross section.

  As shown in FIGS. 1 to 4, the binding tape 4 is spirally wound around the outer periphery of the flowing water pipe 2 and the heater guide pipe 3 to form a cylindrical binding portion 40. In order to prevent the binding tape 4 from being unwound on the outer peripheral surface 402 of the binding unit 40, a strip-shaped adhesive tape 41 is attached along the axial direction.

  The binding tape 4 is a metal tape having a thickness of about 10 to 40 μm, and specifically an aluminum tape mainly composed of aluminum. The binding tape 4 is a non-adhesive tape that does not have adhesiveness on both sides. On the other hand, the adhesive tape 41 is a transparent polyester film having adhesiveness on one side surface (the surface attached to the binding portion 40).

  As shown in the figure, the flowing water pipe 2 and the heater guide pipe 3 bound by the binding tape 4 are covered with a cylindrical covering material 5. The covering material 5 is in contact with the flowing water pipe 2 and the heater guide pipe 3 through the binding tape 4 (the binding portion 40). Although FIG. 4 shows that there is no gap between the binding tape 4 (bundling portion 40) and the covering material 5, there may be a gap between them. The covering material 5 is made of a synthetic resin foam, particularly a polyolefin foam such as polyethylene or polypropylene. The covering material 5 functions to prevent damage and condensation of the flowing water pipe 2 and the heater guide pipe 3, and to improve heat insulation and heat retention. A protective polyethylene sheet (not shown) is attached to the outer peripheral surface of the covering material 5.

  The thickness of the covering material 5 can usually be 3 to 20 mm. When the thickness is less than 3 mm, it may be difficult to sufficiently perform the function as the covering material 5. On the other hand, when the thickness exceeds 20 mm, it may be difficult to handle such as being difficult to bend when bending.

Next, a method for manufacturing the water supply / hot water supply pipe 1 of the present embodiment will be described.
As shown in FIGS. 5-8, the manufacturing method of the water supply / hot-water supply piping 1 of this embodiment has the flowing water pipe 2 and the bellows-shaped outer peripheral surface 32 which provided the unevenness | corrugation along the axial direction, A bundling step of bundling the bundling tape 4 around the outer periphery of the water flow pipe 2 and the heater guide pipe 3 in a state in which the heater guide pipe 3 for inserting and arranging 30 on the inside is bundled; A covering step of covering the outside of the flowing water pipe 2 and the heater guide pipe 3 bound by the binding tape 4 with the covering material 5. In the bundling step, the bundling tape 4 is wound around the outer circumferences of the flowing water pipe 2 and the heater guide pipe 3 while biting into the recesses 321 of the outer circumferential surface 32 of the heater guide pipe 3. This will be described in detail below.

  As shown in FIG. 5, in the present embodiment, the water supply / hot water supply pipe 1 is manufactured using a manufacturing apparatus 6 for manufacturing the water supply / hot water supply pipe 1. As will be described later, the manufacturing device 6 includes a binding tape winding device 61, an adhesive tape attaching device 62 (adhesive tape roll 621, adhesive tape attaching roller 622), a covering material roll 63, a covering material winding guide 64, a temperature A wind blowing device 65, a pipe winding device 66, and the like are provided.

  In manufacturing the water supply / hot water supply pipe 1, first, the flowing water pipe 2 and the heater guide pipe 3 are advanced to the binding tape winding device 61 as shown in FIG. 5. Then, as shown in FIGS. 5 and 6, the disk-shaped jig (not shown) is rotated inside the bundling tape winding device 61, thereby binding the outer periphery of the bundled water flow pipe 2 and heater guide pipe 3. The tape 4 is wound spirally in the B direction (FIG. 6). At this time, the binding tape 4 is wound around the outer periphery of the flowing water pipe 2 and the heater guide pipe 3 while being bitten into the recess 321 of the outer peripheral surface 32 of the heater guide pipe 3 (see FIG. 3). Thereby, the running water pipe 2 and the heater guide pipe 3 are bound by the binding tape 4 in a state where they are in contact with each other.

  Next, as shown in FIG. 5, the flowing water pipe 2 and the heater guide pipe 3 bound by the binding tape 4 (the binding portion 40) are advanced to the adhesive tape attaching device 62. Then, as shown in FIGS. 5 and 7, the adhesive tape 41 supplied from the adhesive tape roll 621 is attached to the outer peripheral surface 402 of the binding portion 40 by the adhesive tape attaching roller 622. At this time, the adhesive tape 41 is affixed to the outer peripheral surface 402 of the binding part 40 along the axial direction of the flowing water pipe 2 and the heater guide pipe 3.

  Next, as shown in FIGS. 5 and 8, the flowing water pipe 2 and the heater guide pipe 3 bound together by the binding tape 4 are covered with the covering material winding guide together with the sheet-shaped covering material 5 supplied from the covering material raw roll 63. 64. As a result, the outer sides of the water flow pipe 2 and the heater guide pipe 3 bound by the binding tape 4 are wound in a cylindrical shape with the covering material 5. And the warm air of 300-400 degreeC is applied to the part (butting | matching part 52) where the edge parts 51 of the width direction of the coating | covering material 5 faced | matched from the warm air blowing apparatus 65, and the edge part 51 of the coating | covering material 5 They are joined together by heat fusion. As a result, the outer sides of the flowing water pipe 2 and the heater guide pipe 3 bound by the binding tape 4 are covered with the covering material 5.

  Thus, the water supply / hot water supply pipe 1 is manufactured. As shown in FIG. 5, the manufactured long (for example, 25 m, 50 m) water supply / hot water supply pipe 1 is wound into a coil shape by a pipe winding device 66 to be in a coiled state.

Next, the effect in the water supply / hot-water supply piping 1 of this embodiment and its manufacturing method is demonstrated.
In the water supply / hot water supply pipe 1 of the present embodiment, a bundling tape 4 is wound around the outer circumference of the water flow pipe 2 and the heater guide pipe 3 in a state where the water flow pipe 2 and the heater guide pipe 3 are in contact with each other. They are united by four. Further, the binding tape 4 is wound in a state of being bitten into the concave portion 321 of the outer peripheral surface 32 of the heater guide tube 3 having a bellows shape.

  Therefore, even if the covering material 5 is compressed for the reasons described above, the thickness of the covering material 5 is reduced, and the inner diameter of the covering material 5 is increased, the contact between the flowing water pipe 2 and the heater guide pipe 3 is reliably maintained. be able to. Further, the axial displacement between the flowing water pipe 2 and the heater guide pipe 3 is less likely to occur. Thereby, heat transfer between the flowing water pipe 2 and the heater guide pipe 3 can be sufficiently ensured.

  Further, the heat of the heater 30 is directly transmitted from the heater guide tube 3 in contact with the water flow tube 2 to the water flow tube 2 and indirectly from the heater guide tube 3 through the binding tape 4 to the water flow tube 2. Therefore, the heat of the heater 30 can be efficiently transmitted from the heater guide tube 3 to the flowing water tube 2. Thereby, the heat transfer between the flowing water pipe 2 and the heater guide pipe 3 can be improved.

  Moreover, since the binding tape 4 bites into the recess 321 of the outer peripheral surface 32 of the heater guide tube 3, the heat collecting area of the binding tape 4 is increased, and the above-described heat transfer effect can be further enhanced. Moreover, since the flowing water pipe 2 and the heater guide pipe | tube 3 will be arrange | positioned in the space 400 (refer FIG. 4) divided by the binding tape 4, the heat-transfer effect through the space 400 is also acquired. Thereby, the heat transfer between the flowing water pipe 2 and the heater guide pipe 3 can be further improved.

  In addition, the outer peripheral surface 32 of the heater guide tube 3 is formed in a bellows shape with irregularities along the axial direction. Therefore, the stretchability / flexibility of the heater guide tube 3 can be improved. Thereby, the stretchability and flexibility of the entire water supply / hot water supply pipe 1 including the heater guide pipe 3 can be improved, and for example, workability during coil winding and installation after manufacture can be improved.

  In the present embodiment, the binding tape 4 is made of metal (aluminum tape). Thereby, since the heat conductivity of the binding tape 4 is improved, the heat of the heater 30 can be efficiently transmitted from the heater guide tube 3 to the flowing water tube 2 through the binding tape 4.

  Moreover, the binding tape 4 is non-adhesive. That is, if the binding tape 4 has adhesiveness, the adhesiveness remains on the surface of the water pipe 2, and there is a possibility that foreign matter may be caught when the water pipe 2 is connected to a joint or the like and the sealing performance may be impaired. It is possible to prevent such a problem from occurring.

  Moreover, the manufacturing method of the piping 1 for water supply / hot water supply of this embodiment performs a bundling process and a coating | coated process in order. That is, in the bundling step, the bundling tape 4 is wound around the outer circumferences of the bundled flowing water pipe 2 and the heater guide pipe 3, and the both are brought into contact with each other. At this time, the binding tape 4 is wound while being bitten into the recess 321 of the outer peripheral surface 32 of the heater guide tube 3 having a bellows shape. In the covering step, the outer sides of the flowing water pipe 2 and the heater guide pipe 3 that are united together are covered with the covering material 5.

  Thereby, the water supply / hot water supply pipe 1 described above, that is, water supply that can maintain the contact between the water flow pipe 2 and the heater guide pipe 3 while having elasticity and flexibility, and can improve the heat transfer between them. -Hot water supply piping 1 can be manufactured easily. In particular, since the flowing water pipe 2 and the heater guide pipe 3 previously bound with the binding tape 4 are covered with the covering material 5, the covering operation becomes very easy.

  Further, in the manufacturing method of the present embodiment, in the covering step, the outer sides of the water flow pipe 2 and the heater guide pipe 3 bound by the binding tape 4 are wound in a cylindrical shape with the sheet-like covering material 5, and then the width of the covering material 5 is obtained. The edge portions 51 in the direction are joined together by heat fusion. Therefore, when the covering material 5 is heat-sealed, hot air is applied to the joining portion (butting portion 52) to heat the covering material 5, but since the binding tape 4 is wound around the outer periphery of the flowing water pipe 2 and the heater guide pipe 3, Can be prevented from directly hitting the flowing water pipe 2 and the heater guide pipe 3. Thereby, it can prevent that the surface of the flowing water pipe 2 or the heater guide pipe 3 melt | dissolves, and adhere | attaches on the coating | covering material 5. FIG.

  Further, the heater guide tube 3 is formed thinner and bellows than the flowing water tube 2 and has elasticity and flexibility. On the other hand, the flowing water pipe 2 is formed thicker than the heater guide pipe 3 and harder than the heater guide pipe 3 so as to withstand water pressure. Therefore, for example, when the water supply / hot water supply pipe 1 is taken up by the pipe take-up device 66, the covering material 5 covering the flowing water pipe 2 and the heater guide pipe 3 is pulled in front of the pipe, and the heater guide pipe inside the covering material 5 is pulled. Only 3 may be stretched. In this case, when the water supply / hot water supply pipe 1 is coiled, the stretched heater guide pipe 3 contracts due to its restoring force, so that the entire length of the heater guide pipe 3 may be shorter than the water flow pipe 2.

  However, in this embodiment, the flowing water pipe 2 and the heater guide pipe 3 are bundled by the bundling tape 4, and the bundling tape 4 is further bitten into the recess 321 of the outer peripheral surface 32 of the heater guide pipe 3. Therefore, the axial displacement between the flowing water pipe 2 and the heater guide pipe 3 hardly occurs, and the above-described problem can be prevented from occurring.

  Thus, according to the present embodiment, the water supply / hot water supply that can maintain the contact between the water flow pipe 2 and the heater guide pipe 3 and improve the heat transfer between the two while having elasticity and flexibility. Piping 1 and its manufacturing method can be provided.

(Experimental example)
In this experimental example, the heat retaining property (heat transfer property) of the water supply / hot water supply piping of the present invention was evaluated.
Specifically, a water supply / hot water supply pipe (test body 1) as an example of the present invention and a water supply / hot water supply pipe (test body 2) as a comparative example were prepared, and a heat retention test was performed on each.

  The test body 1 is the water supply / hot water supply pipe (see FIGS. 1 to 4) of the above-described embodiment. On the other hand, the test body 2 is different from the test body 1 in that it does not have a binding tape and the running water pipe and the heater guide pipe are not bound by the binding tape.

  Next, an outline of the heat retention test will be described. In the heat retention test, the water and hot water supply pipes of the test bodies 1 and 2 are placed in a predetermined temperature environment (−15 ° C., 0 ° C.), and the water temperature in the water pipe after 6 hours has passed with the heater heated. It was measured.

  Next, the results of the heat retention test will be described. The water temperature after the elapse of 6 hours in a -15 ° C environment was 2.6 ° C for test body 1 and 0.3 ° C for test body 2. Moreover, the water temperature after 6-hour progress in a 0 degreeC environment was 12.8 degreeC for the test body 1, and 10.4 degreeC for the test body 2. FIG.

  From the above results, the water supply / hot water supply piping of the test body 1 which is an embodiment of the present invention has a high heat transfer property between the flowing water pipe and the heater guide pipe by bundling tape. I understood. In other words, it was found that the heat of the heater can be efficiently transferred from the heater guide tube to the running water tube. Moreover, it turned out that it is excellent also in heat retention.

(Other embodiments)
The present invention is not limited to the above-described embodiments and the like, and it goes without saying that the present invention can be implemented in various modes without departing from the present invention.

  (1) In the above-described embodiment, the aluminum tape, which is a metal tape that is excellent in thermal conductivity and easy to wind, is used as the bundling tape for bundling the running water pipe and the heater guide pipe. Other than that, other metal tapes (for example, lead tape) may be used.

  (2) In the above-described embodiment, in the method of manufacturing a water supply / hot water supply pipe, a bundling step of bundling a water pipe and a heater guide pipe with a bundling tape, a step of attaching an adhesive tape to the bundling tape, and a bundling water bundled with a bundling tape Although the example (refer FIG. 5) which performs the coating | coating process which coat | covers a pipe | tube and a heater guide pipe | tube with a coating material was demonstrated, it is not necessary to perform each process continuously, for example, it performs in a separate place for every process etc. , Each step may be performed.

DESCRIPTION OF SYMBOLS 1 ... Pipe for water supply / hot water supply 2 ... Flowing water pipe 3 ... Heater guide pipe 30 ... Heater 32 ... Outer peripheral surface 321 ... Recessed part 4 ... Binding tape 5 ... Covering material

Claims (5)

A running water pipe,
A heater guide tube having an accordion-shaped outer peripheral surface provided with irregularities along the axial direction, and the heater being inserted and arranged inside;
In a state where the water flow tube and the heater guide tube are in contact with each other, a binding tape that is wound around the outer periphery of the water flow tube and the heater guide tube and binds both,
A cylindrical covering material covering the outside of the water flow pipe and the heater guide pipe bound by the binding tape;
The water supply / hot water supply pipe characterized in that the binding tape is wound around the outer periphery of the water flow pipe and the heater guide pipe in a state of being bitten into the recess of the outer peripheral surface of the heater guide pipe.   The water supply / hot water supply pipe according to claim 1, wherein the binding tape is made of metal.   The water supply / hot water supply pipe according to claim 1, wherein the binding tape is non-adhesive. In a state in which a water pipe and a heater guide pipe having an accordion-like outer peripheral surface provided with irregularities along the axial direction and a heater guide pipe for inserting and arranging the heater inside are bundled, the water pipe and the heater guide pipe A bundling process in which a bundling tape is wound around the outer periphery and bundling in a state where both are in contact with each other;
A covering step of covering the outside of the flowing water pipe and the heater guide pipe bound by the binding tape with a covering material;
In the bundling process, the bundling tape is wound around the outer periphery of the outer peripheral surface of the heater guide tube while being wound around the outer periphery of the flowing water tube and the heater guide tube. .   In the covering step, the outer sides of the water flow pipe and the heater guide pipe bound by the binding tape are wound into a cylindrical shape with the sheet-like covering material, and then the edge portions in the width direction of the covering material are heat-fused. The method for manufacturing a water supply / hot water supply pipe according to claim 4, wherein the pipes are joined by wearing.

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