JP2540521Y2 - Freezing prevention tube - Google Patents

Description

[Detailed description of the invention]

[0001]

[Industrial application field] The present invention relates to an outdoor exposed portion of a water pipe,
The present invention relates to an antifreeze pipe which is used for a part of a wiring pipe where there is a possibility of water infiltration and automatically cancels freezing in the pipe.

[0002]

2. Description of the Related Art In a portion where there is a risk of freezing, such as an outdoor exposed portion of a water pipe, it is necessary to heat the pipe in order to prevent the water in the pipe from freezing. As this heating means, a so-called external heater is generally used.

[0003]

However, the mounting of an external heater takes time and effort. Further, in order to prevent wasteful electricity from flowing through the heater, it is necessary to control the power supply of the heater with a thermostat, which complicates the power supply circuit.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an easy-to-install and simple-structure antifreeze tube in which the tube itself constitutes a heater and its control means to automatically eliminate freezing in the tube. With the goal.

[0005]

According to the present invention, there is provided an antifreezing tube comprising a tube made of a conductive resin which generates heat by energization, and a first conductive layer laminated on the inner surface of the tube via an insulating layer. A pressure-sensitive layer laminated on the inner surface of the first conductive layer and conducting by compression; and a second conductive layer laminated on the inner surface of the pressure-sensitive layer and insulatingly coated on the inner surface, A power supply is connected to the tubular body via a pressure-sensitive layer sandwiched between the first conductive layer and the second conductive layer.

[0006]

When the liquid in the tube is not frozen, the pressure-sensitive layer is not compressed and maintains a non-conductive state. Therefore, the connection between the tube and the power supply is cut off, and no electricity flows through the tube. When the liquid in the tube freezes, the expansion causes the pressure-sensitive layer to be compressed and switch to a conductive state. As a result, electricity flows through the tube, and the tube generates heat. When the freezing in the tube is eliminated by this heat generation, the pressure-sensitive layer returns to the non-conductive state again, and the power supply to the tube is stopped.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partially cutaway side view of an antifreeze tube according to an embodiment of the present invention, and FIG. 2 is a longitudinal sectional front view.

[0008] The antifreeze pipe 10 is interposed at a place where there is a risk of freezing of the pipe line 20 such as a water pipe using an appropriate joint.

The anti-freeze tube 10 has a tube 11 made of a conductive resin obtained by mixing a conductive metal with a synthetic resin.
The resistance of the tube 11 has, for example, a resistance of several Ω to several tens Ω so that Joule heat required for thawing is generated.

A first conductive layer 13 is laminated on the inner peripheral surface of the tube 11 with an insulating layer 12 interposed therebetween.
The second conductive layer 15 is covered via the pressure-sensitive layer 14.

The first conductive layer 13 and the second conductive layer 15
Like the tube 11, it is made of a conductive resin obtained by mixing a conductive metal with a synthetic resin, and its resistance is adjusted to approximately 0Ω.

The pressure-sensitive layer 14 sandwiched between the first conductive layer 13 and the second conductive layer 15 is, for example, a pressure-sensitive conductive elastomer in which magnetic metal powder is dispersed in an elastomer, and is subjected to compression. It has the property of maintaining a non-conducting state in the absence state and showing conductivity and switching to a conducting state when compressed.

An insulating coat 16 is provided on the inner peripheral surface of the second conductive layer 15 to insulate the second conductive layer 15 from water in the pipe.
Is coated.

A heat insulating material 17 is coated on the outer peripheral surface of the tube 11. The heat insulating material 17 is made of, for example, a foam material, and shields external cold air and prevents dissipation of internal heat.

The power supply 30 has one terminal connected to the second conductive layer 15.
Is connected to one end in the tube axis direction. One end of the first conductive layer 13 in the tube axis direction is connected to one end of the tube body 11 in the tube axis direction. The other end of the tube body 11 in the tube axis direction is connected to the other terminal of the power supply 30.

As the power supply 30, a commercial power supply can be used. However, if a power supply or the like in which a battery is combined with a solar cell is used, wiring with the commercial power supply is unnecessary, and You are no longer restricted by location.

When the water flowing inside the antifreeze tube 10 is not frozen, the pressure-sensitive layer 14 is not compressed.
The conduction between the conductive layer 13 and the second conductive layer 15 becomes non-conductive, and no voltage is applied to both ends of the tube 11. for that reason,
The tube 11 does not generate heat.

When the water flowing inside the antifreeze tube 10 freezes, the pressure-sensitive layer 14 is compressed by expansion due to the freezing and exhibits conductivity. Thereby, conduction between the first conductive layer 13 and the second conductive layer 15 is conducted, and the voltage of the power supply 30 is applied to both ends of the tube 11. As a result, electricity flows over the entire length of the tube 11, and the entire tube 11 generates heat. Thus, the freezing inside the antifreeze tube 10 is eliminated.

At this time, since the pressure-sensitive layer 14 is interposed between the first conductive layer 13 and the second conductive layer 15, even if freezing occurs in a part of the antifreeze tube 10 in the tube axis direction, The conduction between the first conductive layer 13 and the second conductive layer 15 is established. Therefore, partial freezing inside the antifreeze tube 10 is also eliminated.

When the freezing inside the antifreeze tube 10 is eliminated by the heat generated by the tube 11, the pressure-sensitive layer 14 is not compressed, and the connection between the first conductive layer 13 and the second conductive layer 15 becomes non-conductive. Return. As a result, the power supply from the power supply 30 to the tube 11 is stopped.

[0021]

As described above, in the case of the anti-freeze tube according to the present invention, the tube is made of a conductive resin which generates heat by energization, and the tube itself generates heat to eliminate freezing in the tube. This eliminates the need for mounting, and significantly improves workability. A pressure-sensitive layer that conducts by compression is provided on the inner surface side of the tube, which automatically detects freezing in the tube and passes the minimum electricity required for thawing to the tube, so that electricity is of course saved. In addition, there is no need to attach a thermostat, and the power supply circuit is simplified.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view of an antifreeze tube according to an embodiment of the present invention.

FIG. 2 is a vertical sectional front view of the antifreeze tube.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Freezing prevention tube 11 Tube 13 1st conductive layer 14 Pressure sensitive layer 15 2nd conductive layer 16 Insulating coat 30 Power supply

Claims (1)

(57) [Scope of request for utility model registration] 1. A tube made of a conductive resin that generates heat by energization, a first conductive layer laminated on an inner surface of the tube via an insulating layer, and a tube laminated on an inner surface of the first conductive layer. A pressure-sensitive layer that is conductive by compression, and a second conductive layer that is laminated on the inner surface of the pressure-sensitive layer and has an inner surface that is insulated and coated, and is sandwiched between the first conductive layer and the second conductive layer. And a power supply connected to the tube via a pressure-sensitive layer.