JPH0510552U - Antifreeze tube - Google Patents

Abstract

(57) [Summary] [Purpose] To automatically eliminate freezing in the pipe. No external heater is required. Eliminates the need for a thermostat. [Structure] Tube 1 made of conductive resin that self-heats when energized
Make up 1. The first conductive layer 13 is laminated on the inner surface of the tubular body 11 with the insulating layer 12 interposed therebetween. The inner surface of the first conductive layer 13 is covered with the second conductive layer 15 via the pressure sensitive layer 14, and the inner surface thereof is covered with the insulating coat 16. The pressure-sensitive layer 14 sandwiched between the first conductive layer 13 and the second conductive layer 15 is made of, for example, a pressure-sensitive conductive elastomer that exhibits conductivity when compressed. The power source 30 is connected to both ends of the tubular body 11 via the pressure sensitive layer 14. When the water in the tube freezes, the pressure sensitive layer 14 is compressed, and the voltage of the power supply 30 is applied to both ends of the tube body 11. Electricity flows through the pipe body 11 and heat is generated in the pipe body 11, whereby the freezing in the pipe is automatically eliminated.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an anti-freezing pipe that is used for an exposed outdoor portion of a water pipe, a portion of a wiring pipe that may be flooded, etc. and automatically eliminates freezing in the pipe.

[0002]

[Prior Art]

 In areas where there is a risk of freezing, such as exposed outdoor parts of water pipes, it is necessary to forcibly heat the pipes in order to prevent the water in the pipes from freezing. A so-called external heater is generally used as the heating means.

[0003]

[Problems to be solved by the device]

 However, with an external heater, it takes time to mount it. Also, in order to prevent unnecessary electricity from flowing to the heater, it is necessary to control the heater power supply with a thermostat, which complicates the power supply circuit.

The present invention has been made in view of the above circumstances, and provides a freeze-prevention tube having a simple construction and a simple structure in which the tube itself constitutes a heater and its control means to automatically eliminate freezing in the tube. With the goal.

[0005]

[Means for Solving the Problems]

 The antifreezing tube according to the present invention comprises a tube made of a conductive resin that self-heats when energized, a first conductive layer laminated on the inner surface of the tube with an insulating layer, and an inner surface of the first conductive layer. A pressure-sensitive layer that is electrically connected by compression, and a second conductive layer that is laminated on the inner surface of the pressure-sensitive layer and has an inner surface coated with insulation. The first conductive layer and the second conductive layer It is characterized in that a power source is connected to the tubular body via a pressure-sensitive layer sandwiched between and.

[0006]

[Operation] When the liquid in the tube is not frozen, the pressure-sensitive layer is not compressed and maintains a non-conductive state. Therefore, the tube is disconnected from the power source, and no electricity flows through the tube. When the liquid in the tube freezes, the expansion thereof compresses the pressure-sensitive layer and switches it to the conductive state. As a result, electricity flows through the tubular body and the tubular body generates heat. When the freezing inside the tube is eliminated by this heat generation, the pressure-sensitive layer returns to the non-conducting state again, and the power supply to the tube is stopped.

[0007]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partially cutaway side view of an antifreezing tube according to an embodiment of the present invention, and FIG. 2 is a vertical sectional front view.

The antifreezing pipe 10 is inserted in a place such as a water pipe where there is a risk of freezing, by using an appropriate joint.

The antifreezing pipe 10 has a tubular body 11 made of a conductive resin in which a conductive metal is mixed with a synthetic resin. The resistance of the tubular body 11 has, for example, a resistance of several Ω to several tens of Ω so that the Joule heat necessary for thawing is generated.

A first conductive layer 13 is laminated on the inner peripheral surface of the tubular body 11 via an insulating layer 12, and a second conductive layer 15 is laminated on the inner peripheral surface thereof via a pressure sensitive layer 14. It is covered.

Like the tubular body 11, the first conductive layer 13 and the second conductive layer 15 are made of a conductive resin in which a conductive metal is mixed with a synthetic resin, but the resistance thereof 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, It has the property of maintaining a non-conducting state in the state of not receiving it, and exhibiting conductivity and switching to a conducting state when subjected to compression.

The inner peripheral surface of the second conductive layer 15 is covered with an insulating coat 16 in order to insulate the second conductive layer 15 from water in the pipe.

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

One terminal of the power supply 30 is connected to one end of the second conductive layer 15 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.

A commercial power source can be used as the power source 30, but if a power source in which a solar cell is combined with a battery is used, wiring with the commercial power source becomes unnecessary, and the piping portion of the antifreezing pipe 10 is connected to the power source. No longer restricted by position.

When the water flowing inside the antifreezing pipe 10 is not frozen, the pressure-sensitive layer 14 is not compressed, so that the first conductive layer 13 and the second conductive layer 15 are not electrically connected to each other, and No voltage is applied across the body 11. Therefore, the tube body 11 does not generate heat.

When the water flowing inside the antifreezing tube 10 is frozen, the pressure-sensitive layer 14 is compressed due to the expansion caused by the freezing, and exhibits conductivity. As a result, the first conductive layer 13 and the second conductive layer 15 are electrically connected, and the voltage of the power supply 30 is applied to both ends of the tubular body 11. As a result, electricity flows over the entire length of the tubular body 11, and the entire tubular body 11 generates heat. Thus, the freezing inside the antifreezing 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 in the tube axis direction inside the antifreezing tube 10, Conduction is established between the first conductive layer 13 and the second conductive layer 15. Therefore, partial freezing inside the antifreezing tube 10 is also eliminated.

When the freezing inside the antifreezing tube 10 is eliminated by the heat generation of the tube body 11, the pressure sensitive layer 14 is no longer compressed and the first conductive layer 13 and the second conductive layer 15 are brought into a non-conductive state. Return. As a result, the power supply from the power source 30 to the pipe body 11 is stopped.

[0021]

[Effect of the device]

 As described above, in the case of the antifreezing tube according to the present invention, the tube body is made of conductive resin that self-heats when energized, and the tube body itself generates heat to eliminate freezing in the tube, so attach a heater. The labor is saved and the workability is significantly improved. 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 amount of electricity necessary for thawing to the tube, which saves electricity. Therefore, it is not necessary to attach a thermostat, and the power supply circuit is simplified.

[Brief description of drawings]

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

FIG. 2 is a vertical sectional front view of an antifreezing tube.

[Explanation of symbols]

 10 Antifreeze Tube 11 Tubular Body 13 First Conductive Layer 14 Pressure Sensitive Layer 15 Second Conductive Layer 16 Insulating Coat 30 Power Supply

Claims (1)

[Claims for utility model registration] 1. A tube body made of a conductive resin that self-heats when energized, a first conductive layer laminated on an inner surface of the tube body through an insulating layer, and the first A pressure-sensitive layer laminated on the inner surface of the conductive layer and conducting by compression; and a second conductive layer laminated on the inner surface of the pressure-sensitive layer and having an inner surface coated with insulation. An antifreezing tube, characterized in that a power source is connected to the tube body via a pressure sensitive layer sandwiched between the second conductive layer and the second electrically conductive layer.