Electric heating – Heating devices – With heater-unit housing – casing – or support means
Patent
1997-03-12
1999-07-13
Walberg, Teresa
Electric heating
Heating devices
With heater-unit housing, casing, or support means
338 26, H05B 334, H01C 304
Patent
active
059222336
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a heater, which efficiently heats a water-residence portion of a water pipe, etc. having a curved surface, through its surface so that the water-residence portion is not damaged due to freezing of water and relates to a manufacturing method thereof.
BACKGROUND OF THE INVENTION
Conventionally, as shown in FIGS. 40(a) and 40(b), a linear heater 23 like a feeder line of TV, etc. has been used to prevent freezing of water in a water pipe at the coldest of the year in cold districts. The linear heater 23 is composed of a linear main body 22 in which a metallic resistance wire 21 such as a nichrome wire is coated with a vinyl chloride resin or the like which is an electrical insulator.
The linear heater 23 is used such that, for example, the main body 22 is wound around an outer surface of a water pipe in a spiral or is contact-bonded along the water pipe in its lengthwise direction so that the linear heater 23 closely adheres to the outer surface of the water pipe which is exposed on the ground in a house in clod districts. In order to prevent freezing, the linear heater 23 is set so that a fixed amount of electricity, for example, 6 W of electricity per 1 m of the water pipe is consumed.
In addition, a sensor, which controls on/off operations of the linear heater 23 according to a detection temperature, for example, a platinum sensor is provided to a position which is close to an exposed portion of the water pipe in the coldest place of a house, i.e., usually, the north side of the house.
When the detection temperature detected by the sensor becomes lower than 0.degree. C., the linear heater 23 generates heat by electrifying the metallic resistance wire 21 so as to heat the outer surface of the water pipe around which the linear heater 23 was wound. As a result, the water pipe is prevented from bursting due to freezing of water at a low temperature, for example, the detection temperature is lower than 0.degree. C.
However, the linear heater 23 shall be controlled so as to be turned on/off based upon the detection temperature by the sensor provided to a higher position such as a north side of a house where a temperature becomes the lowest.
For this reason, in the case where the linear heater 23 is installed to a water pipe along a south side of a house, for example, even when an outside air temperature on the south side of the house rises and the water temperature in the water pipe rises to such a temperature that freezing of the water does not have to be considered, the linear heater 23 is in the ON state as long as the detection temperature by the sensor is lower than 0.degree. C. For this reason, the linear heater 23 is occasionally in the ON state all day long for a portion which does not have to be heated.
As a result, since the linear heater 23 cannot collectively heat only a specified portion where the temperature of a water pipe is low, it occasionally consumes useless electricity. Thus, the linear heater 23 has such a problem that the consumption of electricity is increased.
Therefore, in order to solve the above problem, it was considered that a heating cable disclosed in U.S. Pat. No. 4,072,848 is used as a heater for preventing freezing of water in a water pipe, etc. at the coldest of the year in cold districts.
In the above publication, as shown in FIG. 41, heating elements 52 with a chip configuration which generate heat by electrifying, and a pair of electric wires 53 made of copper which feed electricity to the heating elements 52 are sealed into a cable-like main body 51 composed of an insulator such as a thermoplastic resin.
The heating elements 52 are positive-characteristic thermistors composed of barium titanate ceramics, and they respectively have the electrode 54 for ohmic contact on both the sides of the main body 51 in the lengthwise direction.
A plurality of the heating elements 52 are placed between the electric wires 53 at fixed intervals along the lengthwise direction, and the heating elements 52 respectively have the elect
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Ishimori Fumitaka
Ohashi Keiichi
Yamaguchi Tetsuo
Keiichi Ohashi
Robinson Daniel Leon
Sekisui Kasethin Kogyo Kabushiki Kaisha
Walberg Teresa
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