JPH05132979A - Heat retaining pipe - Google Patents

Abstract

PURPOSE:To retain the heat of water or hot water in a pipe without winding up the pipe with thermal insulation material or a heater. CONSTITUTION:The outer periphery of a pipe 1 is coated with heat generating coating 20, and a heat generating layer 2 is formed, and to the heat generating layer 2, a current feeding lead wire 4 is jointed. Both the side final-end sections 2a, 2b in the longitudinal direction, of the heat generating layer 2 are provided with lead terminals 3, 3, and via the lead terminals 3, 3, the lead wire 4 may be jointed to the heat generating layer 2. Accordingly, just by arranging the heat retaining pipe and by feeding current to the heat generating layer from an external power source, heat is generated from the heat generating layer and the pipe is warmed, and so water or hot water in the pipe can be handily heat-retained. Besides, the lead wires are jointed to the heat generating layer via the lead terminals, and so without arranging high temperature sections and low temperature sections eccentrically on the heat generating layer, heat can be uniformly generated from the heat generating layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat retaining pipe in which a heat generating coating is applied to the outer circumference of a pipe to form a heat generating layer.

[0002]

2. Description of the Related Art Conventionally, a pipe for supplying water or hot water in a building is kept warm, and in order to keep the water and hot water in the pipe warm and prevent the freezing of the pipe, a heat insulating material is wrapped around the pipe or an electric type pipe is used. I was winding the heater around.

By the way, in recent years, a sheet heating element has come to be used for floor heating equipment and the like. As a technique for making this sheet heating element, there is a sheet heating element disclosed in Japanese Patent Laid-Open No. 3-145090. In addition, a heating resistor coating material (heating coating material) containing a specific flat metal plating powder and a resin component is applied to an insulating substrate equipped with strip electrodes (lead terminals), and a heating resistor coating film (heating Layers) are known. This heating resistor coating can be applied to any material used as a building material such as plastic, concrete, wood, slate, glass, ceramics, paper or metal with an insulating coating. The exothermic temperature of 20 to 80 ° C. depends on the applied voltage (AC 5 to 30 V). In addition, a self-temperature control function can be imparted to the sheet heating element by using, as the resin component, a crystalline resin capable of increasing its resistance value as the sheet heating element generates heat.

[0004]

However, as described above, the work of winding a heat insulating material or a heater around a pipe installed from a hot water outlet of a water heater or the like to a faucet of a bathroom or a kitchen is
The pipe was bent or branched in the middle, which was very troublesome and time-consuming.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a heat retaining pipe capable of retaining water or hot water in a pipe without winding a heat insulating material or a heater around the pipe. I am trying.

[0006]

In order to achieve the above object, in the heat insulating pipe of the present invention, a heat generating coating is applied to the outer circumference of the pipe to form a heat generating layer, and the heat generating layer is provided with a lead for supplying electricity. Connected the wires.

When the pipe has conductivity, an electrically insulating layer may be provided between the pipe and the heat generating layer.

In order to uniformly generate heat in the heat generating layer and prevent uneven distribution of high temperature portions and low temperature portions, lead terminals are provided at both end portions in the longitudinal direction of the heat generating layer, and the heat generating layer is provided with the lead terminals through the lead terminals. You may connect a lead wire.

Further, lead terminals may be provided at opposite positions on the outer peripheral portion of the heat generating layer, and the heat generating layer has a pair of insulating end portions cut along the longitudinal direction of the pipe. Alternatively, a lead terminal may be provided at the insulating terminal portion.

[0010]

The heat-generating layer is heated by connecting the heat-insulating pipe configured as described above, for example, from the outlet of a water heater to the faucet of a bathroom or kitchen, and supplying electricity to the heat-insulating pipe from an external power source. The pipe warms.

[0011]

EXAMPLE An example of a heat insulating pipe according to the present invention is shown in FIGS. 1 and 2 and will be described below. Among them, FIG. 1 is a longitudinal sectional view of the heat retaining pipe, and FIG. 2 is a transverse sectional view of the heat retaining pipe taken along line II-II of FIG.

This heat retaining pipe 100 is shown in FIG. 1 or FIG.
As shown in FIG. 1, the pipe 1 itself has a heat generating function, and the heat generating layer 2 is formed on the outer periphery of the pipe 1 and is provided on the heat generating layer 2 via a pair of lead terminals 3 for supplying electricity. The lead wire 4 is connected, and an external power supply (not shown) is connected to the lead wire 4 via a transformer (not shown) for stepping down the power supply voltage of the external power supply as necessary. There is.

The above-mentioned components will be sequentially described below in the order of manufacturing the heat retaining pipe 100.

First, the exothermic paint 20 is applied to the outer circumference of the pipe 1.
Is applied and cured by a curing method according to the type of curing agent used in the heat-generating coating material 20 to form the heat-generating layer 2. Here, the pipe 1 is a pipe made of an insulating material such as plastics. Exothermic paint 20 is disclosed in Japanese Patent Laid-Open No. 14509/1993.
It is composed of the coating material for heating resistor described in Japanese Patent No. 0, and the coating is performed by a known method such as spray coating or roll coating. In addition, since the crystalline resin that can increase its resistance value as the temperature rises is used as the resin component that is a constituent element of this heating resistor paint, the formed heat generation layer 2 has self-temperature control. It has a function.

Next, a pair of lead terminals 3 are wound around the heat generating layer 2 so as to be wound along the outer periphery of the heat generating layer 2 so as to be opposed to each other at a predetermined distance. Here, the lead terminals 3 and 3 are attached to the end portions 2a and 2b located on both sides of the heat generating layer 2 in the longitudinal direction. The lead terminal 3 is made of a metal tape such as copper or silver or a metal mesh bonded with an adhesive or the like, or is formed by applying a conductive paste or the like and curing it.

Finally, if the lead wire 4 is connected to the lead terminal 3 by solder or conductive paste, the heat retaining pipe 100 is completed. This lead wire 4 may be attached in advance before piping the heat insulation pipe 100 on site, or may be attached after piping.

Insulation pipe 1 manufactured as described above
00 is not particularly shown, for example, after piping from a hot water outlet such as a water heater to a faucet such as a bathroom or kitchen, the lead wire 4 of the heat insulation pipe 100 is connected to an external power source to energize the transformer and the heating layer 2. By connecting via a switch for turning on / off, and a control switch for controlling the voltage applied to the heat generating layer 2 if necessary, the piping work of the heat retaining pipe 100 is completed.

According to the above-mentioned embodiment, since the heat retaining pipe 100 is formed by forming the heat generating layer 2 on the outer circumference of the pipe 1, the heat retaining pipe 100 is used for piping and electricity is supplied to the heat generating layer 2 from an external power source. If supplied, the heat generating layer 2 generates heat and the pipe 1 is warmed, so that it is not necessary to wind a heat insulating material or a heater around the pipe 1, and the water or hot water in the pipe 1 can be easily kept warm.

Further, since the lead wire 4 is connected to the heat generating layer 2 through the lead terminal 3, the heat generating layer 2 can generate heat uniformly without unevenly distributing high temperature portions and low temperature portions. it can.

In the above embodiment, the lead terminals 3 and 3 are the terminal portions 2 located on both sides of the heat generating layer 2 in the longitudinal direction.
The heat insulating pipe 2 shown in FIG. 3 as the first modification is not limited to this.
No. 00, lead terminals 203, 203 may be provided along the longitudinal direction of the pipe 1 at opposite positions on the outer peripheral portion of the heat generating layer 2, or the heat insulation shown as a second modification in FIG. Like the pipe 300, the heat generating layer 2 is provided with a cut 21 along the longitudinal direction of the pipe 1,
Lead terminals 303, 303 may be provided on the insulating terminal portions 2c, 2d on both sides of the cut 21. The break 21 is not limited to one location and may be provided in several locations.

In the above embodiment, the pipe 1 is made of an insulator such as plastics, but it may be made of a conductor such as metal. In this case,
Like the heat retaining pipe 400 shown as the third modified example in FIG.
An insulating layer 410 may be provided between the pipe 1 and the heat generating layer 2 to electrically insulate them.

[0022]

According to the heat insulation pipe of the present invention, since the heat generating layer is formed on the outer circumference of the pipe, the heat insulation pipe is used to, for example, a tap of a water heater or the like to a faucet of a bathroom or a kitchen. Simply by piping and supplying electricity to the heat generating layer from an external power source, the heat generating layer heats up and heats the pipe, so there is no need to wrap a heat insulating material or a heater around the pipe, and the water and hot water in the pipe can be easily kept warm. be able to.

Also, insulating ends forming a pair of the heating layers cut at both ends of the heating layer in the longitudinal direction, at opposite positions on the outer periphery of the heating layer, or along the longitudinal direction of the pipe. Since a lead terminal is disposed on the heat generating layer and the lead wire is connected to the heat generating layer via the lead terminal, the heat generating layer can generate heat uniformly without unevenly distributing the high temperature portion and the low temperature portion in the heat generating layer. You can

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a heat insulating pipe in the present embodiment.

FIG. 2 is a cross-sectional view of the heat retaining pipe taken along line II-II of FIG.

FIG. 3 is a cross-sectional view of a heat retaining pipe according to a first modified example of this embodiment.

FIG. 4 is a cross-sectional view of a heat retaining pipe according to a second modified example of this embodiment.

FIG. 5 is a vertical sectional view of a heat retaining pipe according to a third modification of the present embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipe 2 Heating layer 2a, 2b Terminal part 2c, 2d Insulation terminal part 3,203,303 Lead terminal 4 Lead wire 20 Exothermic paint 100,200,300,400 Thermal insulation pipe 410 Insulating layer

Claims (5)

[Claims] 1. A heat-insulating pipe characterized in that a heat-generating coating is applied to the outer periphery of the pipe to form a heat-generating layer, and a lead wire for supplying electricity is connected to the heat-generating layer. 2. The heat insulating pipe according to claim 1, further comprising an insulating layer provided between the pipe and the heat generating layer. 3. The heat generating layer is provided with lead terminals at both ends in the longitudinal direction, and the lead wire is connected to the heat generating layer via the lead terminals. Insulated pipe described. 4. The lead terminal is provided at a position opposite to the outer peripheral portion of the heat generating layer, and the lead wire is connected to the heat generating layer through the lead terminal. Insulated pipe described. 5. The heat generating layer has a pair of insulating terminal portions cut along the longitudinal direction of the pipe, and lead terminals are provided at these insulating terminal portions, and the heat generating layer is connected to the heat generating layer via the lead terminals. The heat insulation pipe according to claim 1, wherein the lead wire is connected.