JPH1018367A - Freezing preventive method of eater pipe and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To semipermanently prevent freezing by arranging an electric heater on an outer periphery of a water pipe, and arranging a controller to prevent the water pipe from freezing by controlling current-carrying to its electric heater. SOLUTION: A freezing preventive device is composed of an electrode heater H arranged on an outer periphery of a water pipe P and a controller C which is connected to a power source B and controls current-carrying to the electric heater H. The heater H is composed of a tape-shaped heat insulating material to cover the water pipe P by being wound in a spiral shape round an outer peripheral surface of the water pipe P and double heating wires arranged on a contact surface of the pipe P. The heat insulating material is composed by coating one surface of a tape base body composed of a heat insulating type material with an adhesive and an opposite side surface with a separating agent. In the heating wires, a periphery of a conductor is covered with a reinforced synthetic resin coating film excellent in heat resistance and weatherability through an insulating layer. After the heater H is arranged on an outer periphery, both terminals 2d of the heater H are connected to both connectors 3a of the controller C, and its controller C is connected to the power source B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for preventing water pipes from freezing.

[0002]

Generally, the water pipe is prevented from freezing by leaving the water out of the faucet, but this method is left to the user and is a reliable method. However, it is not left to the user, it reliably prevents water pipes from freezing, and also prevents water pipes from freezing regardless of water pipe material, pipe diameter, pipe length, piping location, etc. Provided are a method and an apparatus for preventing freezing of a water pipe which can be easily attached to a pipe, are inexpensive, and can be used semi-permanently.

[0003]

According to a method for preventing freezing of a water pipe according to the present invention for solving the above-mentioned problems, an electric heater is arranged on the outer periphery of the water pipe, and the control of energization of the electric heater allows the water pipe to be prevented from being frozen. Prevents the temperature from dropping to freezing temperatures.

[0004] The apparatus comprises an electric heater arranged on the outer periphery of a water pipe, and a controller for controlling energization of the electric heater to prevent the temperature of the water pipe from falling to a freezing temperature.

Further, an electric heater is constituted by a heat insulating material covering the water pipe and a heating wire provided on a contact surface of the heat insulating material with the water pipe, and the controller controls the temperature of the water pipe based on a resistance change due to the temperature. To control the energization of the electric heater.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an overall view of an apparatus for preventing freezing of a water pipe according to the present invention, which is connected to an electric heater (H) disposed on the outer periphery of a water pipe (P) and a transmission (B). And a controller (C) for controlling energization of the power supply.

As shown in FIGS. 2 and 3, the heater (H) is spirally wound around the outer peripheral surface of the water pipe (P) and is a tape-shaped heat insulating material (1) covering the water pipe (P). ) And a double heating wire (2) provided on the contact surface of the heat insulating material (1) with the water pipe (P).

The heat insulating material (1) is provided with an adhesive layer (1b) by coating an adhesive (adhesive) agent on one surface of a tape base (1a) made of a heat insulating material such as glass fiber. A release agent is coated on the surface of the tape base (1b) opposite to the surface of the tape base (1b) to provide a release layer (1c), and an appropriate length (about 1 to 10 meters) is formed into one roll.

The heating wire (2) is made of a reinforced synthetic material such as cross-linked polyethylene having excellent heat resistance, weather resistance, etc. around a conductive wire (2a) of nickel or the like via an insulating layer (2b) such as a glass fiber braid. FIG. 4A shows a folded part (2A) of the heating wire (2), which is covered with the resin film (2c) and is formed by folding one heating wire (2) at the center part and making it double. As described above, the heat generating wire (2) is disposed at one end of the heat insulating material (1), and the other end of the heat insulating material (1) forms a connection terminal (2d) with the controller (c). A double heating wire (2) is provided on the bonding surface of the heat insulating material (1) with the water pipe (P) at the approximate center in the width direction via the bonding layer (1b) so that both ends are arranged. The heat insulating material (1) and the heat insulating material (1) are roll-wound.

The heater (H) is arranged on the outer periphery of the water pipe (P) by wrapping a seal tape, which is often used at the time of piping, on the outer peripheral surface of the pipe by the above-described configuration of the heater (H) in the form of an adhesive tape. As shown in FIG. 3, as shown in FIG. 3, it can be easily carried out even by an amateur by winding the outer periphery of the water pipe (P) while sequentially feeding out the roll-wound heater (H). Regardless of the pipe diameter, pipe length, piping location, before piping, or already piped, any water pipe (P) and its connection part can be equipped with the heater (H). ) Density (heater winding pitch)
Can also be adjusted freely according to the environment in which it is used.

After the heater (H) is arranged on the outer periphery of the water pipe (P) as described above, as shown in FIG. 1, both terminals (2d) at one end of the heater (H) are connected to both terminals of the controller (C). The controller (C) is connected to a power supply (B) such as a commercial power supply while being connected to the connector (3a). ), The main switch is turned on and actuated to control the power supply to the heater (H) to prevent the temperature of the water pipe (P) from falling to the freezing temperature, Controller (C), the main switch is "on"
, A constant current is passed through the heating wire (2), and a resistance value is calculated at regular intervals, and the temperature of the water pipe (P) is calculated based on the rate of resistance change due to a temperature change of the heating wire (2). Is detected. When the detected temperature is 10 ° C., the power supply to the heater (H) is cut off and the heating of the water pipe (P) is interrupted. When the detected temperature is 0 ° C., the power supply to the heater (H) is restarted and the water pipe (P) is restarted. The heater (H) is turned on and off by the controller (C) so as to prevent the temperature of the water pipe (P) from falling to the freezing temperature and freezing.

Here, the heater heating start temperature (T1)
Is only required to be a temperature slightly higher than the water pipe freezing temperature (T0). Since the water pipe (P) freezes at about minus 1 ° C., which is slightly lower than 0 ° C., the heater heating start temperature (T1) is set in this embodiment. Although the temperature is set to 0 ° C., the temperature (T1) may be set to a slightly higher temperature within an appropriate range. To prevent the water in the pipe from boiling, or to heat it to so-called hot water, that is, not to heat the water to a temperature outside the general concept of water, Is a temperature that can prevent waste of power due to unnecessary heating due to heating of the heater, and furthermore, there is not much difference between the heater heating interruption temperature (T2) and the heater heating start temperature (T1), and hunting of control and durability of each part are performed. Decline In this embodiment, the heater heating interruption temperature (T2) is set to 10 ° C. in consideration of the fact that the heater heating interruption temperature (T2) is higher than the heater heating start temperature (T1). The temperature (T2) may be set high or low in an appropriate range.

Further, in the case of the tape-shaped heater (H) having an appropriate length wound in a roll, the water pipe (P) may be cut in the middle according to the freezing prevention range (length) or the winding pitch, or may be cut off. By connecting to the heater (H), the length can be adjusted freely, and when the heating wire turn-up portion (2A) at one end of the heater (H) is cut, as shown in FIG. Next, the two heat-generating wires (2) are connected to the end opposite to the connection end with the controller (C), thereby unifying the heat-generating wires (2) for use. When connecting and using multiple heaters (H),
As shown in FIG. 4 (C), the ends of the heat insulating materials (1) of the respective heaters (H) are superposed and connected together, and the heating wires (2) are formed.
The heaters (H) are unified and used by connecting the ends of the heater. In short, the double heating wire (2) passes through the adhesive surface of one continuous heat insulating material (1), and the heating wire (2) is folded at one end of the heat insulating material (1) and is turned to the other end. Both ends of the heating wire (2) are drawn out, and one continuous heater (H) is connected to one controller (C) at the beginning or end of this winding.
As shown in the figure, each heating wire (2) of a plurality of heaters (H)
Are connected to a single conductor (4) via a one-touch joint (5), and both ends of the conductor (4) are connected to a connector (3a) of a controller (C). 1) Prevent freezing at multiple locations
It can also be covered by one controller (C).

Further, the heater (H) is provided in addition to the tape,
It may be formed in a sheet shape or a pipe shape. In the case of a sheet-shaped heater (H), one heat generating wire (like the above) is formed on one surface of a heat insulating sheet base made of a heat insulating material such as glass fiber. The heating wire (2) is folded back at the center, and the heating wire (2), which is a double heating wire (2), is densely stretched and adhered and fixed.
The connection terminal (2d) is constituted by one end line of the sheet base at both ends of. In the case of this sheet-shaped heater (H), the heat generation wire mounting surface of the heat insulating material (1) may or may not have the adhesive layer (1b). Simply, the sheet-like heater (H) is simply wound around the water pipe (P), and the heater (H) is adhered and fixed to the water pipe (P) by the adhesive layer (1b).
If b) does not exist, the sheet-like heater (H) is wound around the water pipe (P), and then the heater (H) is tightened and fixed to the water pipe (P) using, for example, an adhesive tape or a plurality of bands. . On the other hand, in the case of a pipe-shaped heater (H),
On the inner surface of a heat insulating pipe made of a heat insulating material such as glass fiber, a single heating wire (2) is folded back at the center in the same manner as described above, and a double heating wire (2) is wound in a coil shape to form a cylindrical shape. Is fixed by suction, and a connection terminal (2d) is formed at one end of the pipe material at both ends of the heating wire (2). In the case of this pipe-shaped heater (H), it is fitted to the outer surface of the water pipe (P) to be mainly piped, and the movement in the pipe axis direction is regulated using an adhesive tape or a plurality of bands.

[0015]

As is apparent from the above embodiments, the present invention has an electric heater (H) arranged on the outer periphery of a water pipe (P), and the electric heater (H) is energized to control the water pipe (P). ) Is prevented from lowering to the freezing temperature, so that the water pipe (P) can be reliably prevented from freezing, instead of leaving it to the user.

A heat insulating material (1) for covering the water pipe (P)
And a heat generating wire (2) provided on a contact surface of the heat insulating material (1) with the water pipe (P) to constitute an electric heater (H). Since the power supply to the electric heater (H) is controlled by detecting the temperature of the water pipe (P), any water pipe (P)
Can be prevented from freezing, can be easily attached to the water pipe (P), the configuration of the heater (H) and the controller (C) is simple, and the heating wire (2) also serves as a temperature sensor. Thus, the configuration can be simplified, the price can be reduced, and there is an effect that the device can be used semi-permanently with little failure and excellent durability.

[Brief description of the drawings]

FIG. 1 is an overall view of an apparatus for preventing freezing of a water pipe according to the present invention.

FIG. 2 is an enlarged sectional explanatory view of a heater.

FIG. 3 is an explanatory view of mounting a heater.

FIG. 4 is an explanatory diagram of connection of a heating wire.

FIG. 5 is an explanatory view showing a usage modification of a heater.

[Explanation of symbols]

 (C) Controller (H) Heater (P) Water pipe (1) Insulation material (2) Heating wire

Claims (3)

[Claims] 1. An electric heater (H) is arranged on the outer periphery of a water pipe (P), and by controlling the energization of the electric heater (H), the temperature of the water pipe (P) is prevented from lowering to a freezing temperature. A method for preventing freezing of a water pipe. 2. An electric heater (H) disposed on the outer periphery of the water pipe (P), and controlling the power supply to the electric heater (H) to prevent the temperature of the water pipe (P) from falling to the freezing temperature. An apparatus for preventing freezing of a water pipe, comprising a controller (C) for prevention. 3. An electric heater (H) by a heat insulating material (1) covering a water pipe (P) and a heating wire (2) provided on a contact surface of the heat insulating material (1) with the water pipe (P). The controller (C) detects the temperature of the water pipe (P) based on a resistance change due to the temperature and controls energization to the electric heater (H). Water pipe freezing prevention device.