JPH0465509B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a temperature detection wire used in electric heating appliances such as electric carpets and electric blankets.

Structure of conventional example and its problems Conventionally, a temperature detection wire used in a planar electric heating device has an inner wound electrode 3' on a core thread 1 as shown in FIG.
A structure in which a polymer temperature sensing layer 2, an outer wound electrode 4, a separation layer 5, and an insulating jacket 6 are sequentially formed in concentric circles is used. This detection wire is wire-shaped and easy to wire, and has an advantage over parallel cables in terms of wiring. However, the manufacturing process involved a large number of steps, including four steps: an inner winding step, a temperature sensitive layer coating step, an outer winding step, and an outer covering step. The core yarn 1 is necessary to maintain tensile strength, and two less productive steps, an inner winding step and an outer winding step, are also necessary. Here, separation layer 5
In the structure shown in Figure 1, the process of winding the (polyester film) could be done in one step by simultaneously winding the outer-wound electrode 4, but the two steps of inner-winding and outer-winding described above took a long time. It required Therefore, the inventor of the present invention proposed a parallel winding detection wire as shown in Fig. 2 in Application No. 58-69176, which greatly simplified the manufacturing process, but one problem occurred in manufacturing. Ta. In other words, in the parallel winding detection wire, it was not possible to distinguish between the two wires of the pair of electrodes 3 and 4 at the right end and the left end of the temperature detection wire, and it was necessary to distinguish them by an electrical continuity test. .

OBJECT OF THE INVENTION An object of the present invention is to enable a pair of electrodes in a parallel-wound temperature sensing wire to be visually or tactually distinguished from each other.

Structure of the Invention The temperature sensing wire according to the present invention is one in which the wire diameter, foil shape, or color of the electrode wire is made different, for example, so that each of the pair of spiral electrodes in the parallel-wound temperature sensing wire can be distinguished.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described based on FIGS. 2 to 4.

Figure 2 shows an example in which a pair of spiral electrodes are formed on the outside of two layers of polymer thermosensors.
can be configured by simultaneously applying it to a winding machine.
Here, spiral electrodes 3 and 4 are made of stainless steel foil, 3 is a foil with a cross section of 0.32 mm x 0.05 mm, and 4 is a foil with a cross section of 0.32 mm x 0.05 mm.
A foil of 0.25 mm x 0.08 mm was used. When I peeled off the skin during terminal processing, I could easily visually distinguish the two lines. Note that 1 is a core yarn and 6 is an insulating jacket.

FIG. 3 shows a pair of spiral electrodes composed of a foil-made stainless steel wire 3a and a stainless steel round wire 4a, and a layer made of a nylon 12 composition as a separation layer 5.
It is coated with a thickness of 0.2mm. Since the separation layer 5 and the insulating jacket 6 (soft polyvinyl chloride composition) can be tubed at the same time using a two-stage continuous extrusion method in the same wire manufacturing process, the wire can be manufactured with a low number of manufacturing steps.

In addition, an ion conductive or capacitive type polymer composition is used for the polymer thermosensitive body 2, and a fiber yarn of polyester, aramid, glass, nylon, etc. is used for the core yarn 1, and the tensile properties of the sensing wire are It has a

In another embodiment, as shown in FIG. 4, a heat-fusible polymer layer 7 and a heat-generating conductor wire 8 are provided in contact with a pair of spiral electrodes 3 and 4 provided on two layers of a polymer temperature-sensitive body, and a heat-sensitive heater is provided. It can also have the function of Temperature detection is carried out using two layers of polymer thermosensors, but in the event of an abnormal temperature rise such as when an electronic control circuit malfunctions, the thermofusible polymer layer 7 will melt, causing a short circuit between the pair of spiral electrodes 3 and 4. It is possible to detect abnormal temperature rise by short-circuiting with either one or the other. If this temperature-sensitive heater wire is used, a one-line temperature control device can be constructed using an ion-conducting polymer temperature sensor. A short circuit between the pair of spiral electrodes 3 and 4 results in a short circuit state of the temperature detection electrodes, so it is equivalent to an abnormally high temperature signal and has safety.

Hereinafter, specific example data in the above embodiment will be explained using FIG. 2.

(1) A soft polyvinyl chloride composition doped with an ion carrier, which is an ion conductive polymeric temperature sensitive material 2, on a 1500 denier polyester core yarn 1 (30°C volume specific impedance 1.2×10 ⁹ Ω−
cm) was coated with a thickness of 0.2 mm. Then foil width 0.32
mm (foil thickness 0.05mm) and width 0.25mm (foil thickness 0.08mm)
Spiral electrodes 3 and 4 of stainless steel wire and thickness
Separation layer 5 of 16μm polyester film 1.8
It was wound using a winding machine with a pitch of mm. On top of that, a soft PVC insulating jacket 6 with a thickness of 0.5 mm is applied.
A temperature sensing wire having a structure as shown in FIG. 2 was manufactured by extrusion molding using a wire making extruder so as to have the following shape. The manufacturing man-hours are approximately 30 compared to the conventional detection line shown in Figure 1.
% was able to disappear.

The impedance temperature characteristic of the temperature detection line according to this example is 2.2× at 30℃, 60Hz, and length 10m.
10 ⁶ Ω. The B constant between 30℃ and 60℃ is 9600〓
It is. The B constant is approximately smaller than that of the structure shown in Figure 1.
1300〓It was rising.

(2) As shown in Figure 4, a copper wire with a width of 0.48 mm and a thickness of 0.08 mm is wound on a core thread 1 of 2000 denier polyester with a winding machine at a pitch of 0.8 mm.
was formed, and Nylon 12 was coated with a thickness of 0.2 mm using an extruder to form seven layers of hot-melt polymer. Next, a pair of spiral electrodes 3 and 4 were formed using stainless steel wires having the same shape as in Example 1, and on top of these, two layers of polymeric temperature sensitive material and a separation layer 5 made of nylon 12 were formed.
and insulation jacket 6 made of soft polyvinyl chloride
is simultaneously extruded using three extruders in succession,
A temperature detection wire as shown in Fig. 4 was manufactured. When this temperature detection wire was locally overheated, a short circuit occurred between spiral electrodes 3 and 4 at 170℃.
The power to the heating wire has been cut off.

Effects of the Invention According to the present invention, the manufacturing process of the temperature detection wire can be simplified, and each spiral electrode can be instantly distinguished, so manufacturing is easier and it is not necessary to provide a heat-fusible polymer layer. Therefore, it also has a final safety function and can provide simplified temperature detection wires and heat-sensitive heaters, which is highly effective in manufacturing electric heating appliances.

[Brief explanation of drawings]

Figure 1 is an exploded perspective view of a conventional temperature detection line;
4 to 4 are front views of temperature detection lines in one embodiment of the present invention, respectively. 1... Core yarn, 2... Polymer temperature sensitive body, 3, 4...
Spiral electrode, 5...Separation layer, 6...Insulating jacket, 7...Thermofusible polymer layer, 8...Heating conductor wire.

Claims (1)

[Scope of Claims] 1 A pair of spiral electrodes are provided on the inner or outer surface of a cylindrical polymeric temperature sensitive body, and these pair of spiral electrodes are made of metal foil that can be visually or tactilely distinguished from each other for temperature sensing. line. 2. The temperature sensing wire according to claim 1, wherein the pair of spiral electrodes can be distinguished from each other by wire diameter, foil shape, hardness, or color. 3 A pair of spiral electrodes on the polymer thermosensitive body,
The temperature sensing wire according to claim 1 or 2, wherein a separation layer and an insulating jacket are sequentially arranged. 4. The temperature sensing wire according to claim 3, wherein the separation layer is a tubing layer made of nylon. 5. Claim 1 or 2, in which a heating conductor wire is formed in a spiral shape on a core yarn, and a heat-melting polymer layer, a pair of spiral electrodes, and a polymer temperature sensitive body are sequentially formed thereon. Temperature detection line described in section.