JP2712387B2 - Thermal line and thermal heating line - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a heat-sensitive wire used in an electric blanket, an electric carpet, or the like by being wired together with a heat-generating wire, or a single heat-sensitive and heat-sensitive wire. The present invention relates to a heat-sensitive heat generating wire which can be used for both.

[Conventional technology]

Generally, surface warming devices such as electric blankets and electric carpets are
A cord-like heating wire and a heat sensing wire for temperature detection are arranged in a meandering shape, and the heat sensing wire detects the temperature of the planar heating device,
It serves to control the temperature of the heating wire. In recent years, a heat-sensitive heating wire in which a heating wire and a heat-sensitive wire can be shared by a single wire has been put to practical use.

The structure of the heat-sensitive wire and the heat-sensitive heat-generating wire are almost the same. For example, in the structure shown in FIG. 1, an insulating core yarn (1) and a ribbon-shaped inner winding wound spirally around its outer periphery are used. An electric conductor wire (2) and a thermosensitive body (3) made of a thermosensitive resin having a negative temperature coefficient on its outer periphery are coated by extrusion molding, and then the outer periphery of the thermosensitive body (3) is covered with a ribbon. After winding the outer electric wire (6) in a spiral shape,
Wrap a tape to be a separation layer (4), and furthermore, an insulating layer (5),
It is constituted by covering the heat bonding layer (5 ') by extrusion molding.

As the temperature sensing element (3), an element whose impedance value decreases with a rise in temperature is used, and the temperature change is converted into an impedance change by the inner winding electric conductor wire (2) and the outer winding electric conductor wire (6). The temperature can be detected and controlled.

When this heat-sensitive wire is used as a heat-sensitive heat-generating wire, one of the inner-wound electric conductor wire (2) and the outer-wound electric conductor wire (6) may be used as the heat-generating wire.

In addition, as shown in FIG.
The electric conductor wire (8) and the second electric conductor wire (9) are juxtaposed and wound, and a thermosensitive body (3) is coated on its outer periphery by extrusion molding to form a heat-sensitive wire. A structure in which a separating yarn (7) is wound with a separating yarn is shown in Japanese Utility Model Application Laid-Open No. 61-206226.

Further, as shown in FIG. 3, a first electric conductor wire (8) and a second electric conductor wire (9) are wound side by side on the outer periphery of a temperature sensing element (3), and a separation layer is formed on the outer periphery. In the heat-sensitive wire formed by winding the tape to become (4) and further covering the insulating layer (5) by extrusion molding, a structure in which a separating thread (7) is interposed to insulate the conductors from each other is used. 62-79316.

In addition, the applicant of the present application has applied for a configuration shown in FIG. 4 as an improvement plan of FIG. 1 (Japanese Patent Application Laid-Open No. 63-88780). This uses an inner electric conductor line (10) composed of a composite wire of a thin metal wire at the center, and the first and second electric conductor lines (8) and (9) have mutual impedance even if they are disconnected due to bending or the like. The value does not change.

[Problems to be solved by the invention]

Problems to be solved from the above-listed prior arts include the following.

(1) In FIG. 2, the separating thread (7) is present on one side of the second electric conductor wire (9), but is not present on the other side. (8) The interval between the first and second electric conductor wires (8) and (9) is shifted due to loosening of the spiral winding of (9) or the detachment of the conductor during extrusion molding of the temperature sensing element (3). In some cases, the impedance between the first and second electric conductor lines (8) and (9) may be deviated due to a short circuit or a short circuit.

(2) In the case of FIG. 3, the first and second
The impedance between the first and second electric conductor lines (8) and (9) may be deviated due to insufficient or incomplete insertion of the electric conductor lines (8) and (9). .

(3) In FIG. 4, the external force such as the step of spirally winding the first and second electric conductor wires (8) and (9) and the repeated bending when used in a hot carpet or the like is used. If so, the first and second electric conductor wires (8) and (9) may be short-circuited to each other. Further, this is improved so that the mutual impedance value of the first and second electric conductor wires (8) and (9) is not affected even if the inner electric conductor wire (10) is broken due to bending or the like. However, depending on the way the inner electric conductor wire (10) is broken, this broken part breaks through the thermosensitive body (3) and short-circuits the first and second electric conductor wires (8) and (9). However, the impedance value may be reduced.

[Means for solving the problem]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has a temperature-sensitive body (3) made of a negative-molecular polymer whose impedance changes according to a temperature change, and an outer surface of the temperature-sensitive body (3). The wound first outer winding electric conductor wire (8), and the second outer winding electric conductor wire (9) which is separated and wound in parallel with the first outer winding electric conductor wire (8). And an inner electric conductor wire (10) disposed on the inner surface of the temperature sensing element (3), and insulation provided on the outer surface of the first and second outer winding electric conductor wires (8) and (9). A first outer winding electric wire (8), a temperature sensing element (3), an inner electric wiring (10), a temperature sensing element, a second outer winding electric wiring (9). To the heat-sensitive wire for detecting the impedance by the current flowing through the path, or to the heat-sensitive heat-generating wire in which one of the first and second outer winding electric conductor wires (8) and (9) is used as the heat-generating wire. And an insulating separating thread (7) having substantially the same thickness as that of the first outer-wound electric conductor wire (8) is provided on both sides of the first outer-wound electric conductor wire (8). It is configured to insulate it from the electric conductor wire (9).

[Action]

Thus, the impedance is detected by the first outer winding electric conductor wire (8), the temperature sensing element (3), the inner electric wiring (10), the temperature sensing element (3), and the second outer winding electric wiring. Since the current flows through the path of (9), the inner electric conductor (1
Even if 0) breaks in the middle due to bending or the like, detection of impedance is not affected as long as it does not break through the thermosensitive body (3). Even if the inner electric conductor wire (10) breaks through the temperature sensing element (3), the separating yarn (7) exists between the first and second outer winding electric conductor wires (8) and (9). ,
The inner electric conductor wire (10) further breaks through the separating yarn (7), or contacts the first and second outer winding electric conductor wires (8) (9) across the separating yarn (7). Unless the first and second outer conductor wires (8) and (9) are short-circuited, the impedance detection is not affected.

Further, since the impedance detection current passes through the thermosensitive body (3) twice, even if a thermosensitive resin having a negative characteristic is used for the thermosensitive body (3), the self-generated heat of the thermosensitive resin itself in a high temperature range is reduced. it can.

Also, since insulating separating yarns (7) having substantially the same thickness as the first externally wound electric conductor wire (8) are provided on both sides of the first externally wound electric conductor wire (8), the first and second electric conductor wires are provided. In the spiral winding step of the second outer winding electric conductor wires (8) and (9), the first and second outer winding electric conductor wires (8) and (9) are not short-circuited to each other, so that a finished product can be obtained. As described above, the probability of a mutual short circuit between the first and second outer winding electric conductor wires (8) and (9) due to disconnection of the inner electric conductor wire (10) can be extremely reduced.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to FIG. Here, the heat-sensitive heating element will be described.

The inner electric conductor wire (10) is a plurality of ultra-fine stainless steel or nickel wires of about 0.05 to 0.1 mmφ (7 in this case)
The conductor surface is subjected to a surface treatment such as nickel plating if necessary. The temperature sensing element (3) has a negative temperature coefficient such that the outer periphery of the inner electric conductor wire (10) is coated by extrusion processing. For example, a polyamide resin or a soft polyvinyl chloride resin may be made of a halide or a quaternary ammonium salt. This is a heat-sensitive resin layer in which the impedance value is decreased by increasing the temperature by adding a small amount of an additive, and is usually extruded to a thickness of about 0.2 to 0.4 mm.

The first externally wound electric conductor wire (8) and the second externally wound electric conductor wire (9) are wound on the outer surface of the temperature sensing element (3) in a separated state. A copper alloy wire of about 0.15 mmφ or the like is used, and a surface treatment such as nickel plating is performed as necessary. First outer winding electric conductor wire (8)
In order to maintain insulation with the second outer winding electric conductor wire (9), a material having the same thickness of insulation as the first outer winding electric conductor wire (8), for example, a polyester-based material And the like. (4) is a separation layer made of a polyester tape or the like. (5) is an insulating layer made of a soft polyvinyl chloride resin or the like, and a separating layer (4).
Is usually coated to a thickness of about 0.4 to 0.5 mm by extrusion. (5 ') is a heat bonding layer made of low density polyethylene or the like.

FIG. 6 is a production model diagram showing a state of first and second outer winding electric conductor wires (8) and (9) of this embodiment being closely aligned and wound. During the process in which the material in which the inner conductor (10) is coated with the temperature sensing element (3) is wound around the lower bobbin (B) while rotating while being unwound from the upper bobbin (A), the bobbin ( The first and second outer-wound electric conductor wires (8) and (9) and the separating yarn (7) wound around C) are sequentially supplied and arranged so as to be wound without overlapping.
Therefore, in this close-rolling winding, the first and second outer winding electric conductor wires (8) and (9) preferably have a circular cross-section rather than a ribbon shape, and the number thereof can be easily changed. It can be carried out.

In this embodiment, as shown in FIG. 5, one first outer winding electric conductor wire (8) and three second outer winding electric conductor wires (9) are used. Is not limited to this number, and the number may be appropriately determined so as to obtain a necessary resistance value.

In this embodiment, the heat bonding layer (5 ') is used.
This may be used as needed, and may not be used if not needed.

Further, in the present embodiment, the inner electric conductor (10) is made of a thin metal wire, but a composite twisted yarn of an insulating yarn and a thin metal wire may be used to further improve the bending performance.
In this case, a metal film such as nickel plating is applied to the insulating yarn.
Bending performance is further improved by applying about 0.01 to 1 μm.

〔effect〕

(1) The detection of the impedance is performed by the first outer winding electric conductor wire (8), the temperature sensor (3), the inner electric conductor wire (10), the temperature sensor (3), and the second outer winding electric conductor wire. The inner electric conductor wire (10) is performed by passing a current through the path of (9).
Even if the wire breaks in the middle due to bending or the like, the impedance detection is not affected as long as it does not break through the thermosensitive body (3). Even if the inner electric conductor wire (10) breaks through the temperature sensing element (3), the separating yarn (7) exists between the first and second outer winding electric conductor wires (8) and (9). , The inner electric conductor wire (10) further breaks through the separating yarn (7),
Alternatively, the first and second outer-wound electric conductor wires (8) and (9) are brought into contact with the first and second outer-wound electric conductor wires (8) and (9) across the separating yarn (7). As long as there is no short circuit, the impedance detection is not affected. Further, since the impedance detection current passes through the thermosensitive body (3) twice, even if a thermosensitive resin having a negative characteristic is used for the thermosensitive body (3), the self-heating of the thermosensitive resin itself in a high temperature range is prevented. Can be reduced.

Strictly speaking, regarding the path through which current flows,
In addition to the paths described above, the first outer winding electric conductor wire (8) to
Electric current also flows through the path from the temperature sensing element (3) to the second outer winding electric conductor wire (9). In the case of this path, the first outer winding electric conductor wire (8) and the second outer winding electric conductor wire (9) are adjacent to each other via the separating yarn (7), so that the temperature sensing element ( A current flows near the surface of 3). That is, the current flowing through this path is very small because it is close to the surface current. On the other hand, the above-mentioned first outer winding electric conductor wire (8)-temperature sensing element (3)-inner electric conductor wire (10)-temperature sensing element (3)-second outer winding electric conductor wire ( For the route of 9), the inner electric conductor wire (10),
Since the facing state with the first and second outer winding electric conductor wires (8) and (9) is stable, a large current flows stably. That is, a stable large current flowing through this path contributes to the detection of the impedance.

(2) Since insulating separating yarns (7) having substantially the same thickness as the first outer winding electric conductor wire (8) are provided on both sides of the first outer winding electric conductor wire (8), In the spiral winding step of the second outer winding electric conductor wires (8) and (9), the first and second outer winding electric conductor wires (8) and (9) are not short-circuited to each other, so that a finished product is obtained. As described above, the probability of the first and second outer winding electric conductor wires (8) and (9) being short-circuited to each other due to the disconnection of the inner electric conductor wire (10) can be extremely reduced.

(3) Since the separating yarn (7) is provided on both sides of the first outer winding electric conductor line (8), the first outer winding electric conductor line (8) and the second outer winding electric conductor line (9). Can be maintained substantially evenly over the entire length, and manufacturing variations in impedance can be reduced.

(4) When the inner electric conductor wire (10) is a composite twisted yarn of a thin metal wire, the bending performance is improved, and even if the wire is broken, the degree of freedom is small because the twisted yarn is used, and there is no danger of breaking through the thermosensitive body (3). Few. In addition, the adhesion of the temperature sensing element (3) to the inner electric conductor wire (10) is improved, the temperature characteristics of the temperature sensing element (3) can be accurately detected, and the B constant increases.

(5) When the inner electric conductor wire (10) is a composite twisted yarn of a thin metal wire and an insulative yarn, the bending performance is improved, and even if the wire is broken, the degree of freedom is small because the twisted yarn is used. ) Is unlikely to break through. In addition, the adhesion of the temperature sensing element (3) to the inner electric conductor wire (10) is improved, the temperature characteristics of the temperature sensing element (3) can be accurately detected, and the B constant increases.

(6) When the inner electric conductor wire (10) is made of an insulating yarn provided with a metal coating, the flexibility is improved and the bending performance is improved. There is little risk of breaking through the thermosensitive body (3). In addition, thermosensitive body (3)
Of the temperature-sensitive body (3) can be accurately detected, and the B constant increases.

(7) When the first and second outer-wound electric conductor wires (8) and (9) and the separating yarn (7) are circular in cross section, they can be easily wound and wound, and can be transferred to the thermosensitive body (3). Since some biting can be expected, the adhesion to the thermosensitive body (3) is improved, and the temperature characteristics of the thermosensitive resin constituting the thermosensitive body (3) can be accurately detected, and the B constant increases. Further, the spiral shapes of the first and second outer winding electric conductor wires (8) and (9) and the separating yarn (7) are less likely to shift due to the bite.
Short circuit due to displacement of these lines due to bending or the like can be prevented. In addition, the first and second outer winding electric conductor wires (8)
When any one of (9) is used as the heating wire, the resistance value can be controlled by the number of windings so that the outer winding electric conductor wire serving as the heating wire has the desired heating resistance. Sharing can be achieved.

[Brief description of the drawings]

1, 2, and 3 are structural diagrams of a conventional heat-sensitive wire. FIG. 4 is a structural diagram of a conventional heat-sensitive wire or heat-sensitive heating wire. FIG. 5 is a structural diagram of a heat-sensitive wire or a heat-sensitive heating wire according to an embodiment of the present invention. FIG. 6 is a model drawing of the production of the heat-sensitive wire or heat-sensitive heating wire of FIG. 3 ... temperature sensing element, 5 ... insulating layer, 7 ... separating thread, 8 ... first outer winding electric conductor wire, 9 ... second outer winding electric conductor wire, 10
...... Inner electric conductor wire.

Claims (3)

(57) [Claims] 1. A temperature sensing element made of a negative polymer whose impedance changes according to a temperature change, a first outer winding electric wire wound on an outer surface of the temperature sensing element, and a first outer conductor. A second outer winding electric conductor wire wound separately and in parallel with the winding electric conductor wire, an inner electric conductor wire disposed on the inner surface of the temperature sensing element, and the first and second outer conductor wires; An insulating layer provided on the outer surface of the wound electric conductor wire, and flows through a path of the first outer wound electric conductor wire, the temperature sensing element, the inner electric conductor wire, the temperature sensing element, and the second outer winding electric conductor wire. In a heat-sensitive wire for detecting an impedance by an electric current, an insulating separating thread having substantially the same thickness as the outer winding electric conductor line is provided on both sides of the first outer winding electric conductor line to form a second outer winding electric conductor line. A heat-sensitive wire characterized by providing insulation between the heat-sensitive wire. 2. A temperature sensing element made of a negative polymer whose impedance changes according to a temperature change, a first outer winding electric wire wound on an outer surface of the temperature sensing element, and a first outer winding. A second outer winding electric conductor wire wound separately and in parallel with the winding electric conductor wire, an inner electric conductor wire disposed on the inner surface of the temperature sensing element, and the first and second outer conductor wires; An insulating layer provided on an outer surface of the wound electric conductor wire, wherein one of the first and second outer wound electric conductor wires is used as a heating wire, and the first outer wound electric conductor wire, a temperature sensing element, In a heat-sensitive heating wire for detecting impedance by a current flowing through a path of the inner electric conductor wire, the temperature sensing element, and the second outer electric wire, the outer electric wire is provided on both sides of the first outer electric wire. That an insulating separating yarn having substantially the same thickness as that described above is provided to insulate the second outer winding electric conductor wire. Thermal heating wire to butterflies. 3. The heat-sensitive heating wire according to claim 1, wherein the inner electric conductor wire is made of a composite twisted yarn of a thin metal wire.