JPH0612690B2 - Surface heating element - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention has a structure in which a temperature sensor for temperature detection is integrally woven in addition to a heating element and an electrode, has flexibility, and does not give a feeling of unevenness. Regarding surface heating element.

(Prior Art) A surface heating element manufactured by conventional weaving generally has a heating element and an electrode woven therein, and a temperature sensor (a linear sensor that detects the temperature of the heating element becomes linear. Many of them are attached to the surface heating element in a later process, which requires a lot of man-hours and the surface heating element itself is thick and heavy in order to eliminate the stiff feeling of the temperature sensor. Without
There were drawbacks that resulted in high cost and reduced heating efficiency.

From such a point, as disclosed in Japanese Utility Model Application Laid-Open No. 54-159449, a surface heating element in which a heat-sensitive wire is woven during the weaving process has been proposed.

In the above-mentioned known technique, a flexible structure is formed by arranging electrodes, in which a plurality of conductive wires are woven, at opposite end portions of a woven fabric so as to face each other, applying a conductive coating to the woven fabric, and covering the whole with an insulating coating. In the surface heating element having, the heat-sensitive wire covered with an insulating material is woven at a constant interval together with the conductive wire when the woven cloth is woven.

(Problems to be solved by the invention) What is disclosed in the above-mentioned public relations is that the heat-sensitive wire has a glass fiber or the like as a core, and a bimetal fine wire is wound around the core, and further the outer circumference is insulated with flexible rubber or plastic. It has been shown to be woven with a body to form a woven yarn which can be woven as weft yarns and / or warp yarns.

Since the above-mentioned heat-sensitive wire is obviously the outer shape of the insulator, it is necessary to remove the covering member to make electrical contact when connecting to the resistance detection circuit. Only the content that it will be integrated into the temperature control is described, the detailed structure is unknown, there is no speculation about the concrete means, it is lacking in practicality, and it will be a completed device Still has the drawback of requiring complex processing steps.

Therefore, according to the present invention, the temperature sensor can be woven in the same manner as the insulating thread in the process of weaving, and the process of electrically connecting the temperature sensor to the flexible electrode provided in the inner layer of the weaving is collectively performed. It was designed to provide a surface heating element that can be heated, and thus can be finished into a thin sheet with great flexibility. Furthermore, it can be easily put together with a controller such as a controller for practical use. It is an object of the invention to play a part in the popularization of suitable products.

(Means for Solving the Problems) In order to sufficiently achieve the above-mentioned object, the present invention is such that the conductive thread (2) for the heating element is arranged alternately or every few threads with respect to the insulating thread (1). A tape-shaped temperature sensor (3) is sandwiched between insulating yarns (1), and a plurality of warp yarns formed by arranging a plurality of them at wide intervals, and a large number of insulating yarns (4) woven into the warp yarns group. Inside, there is an electrode (6) formed by weaving a plurality of conductive yarns (5) adjacent to each other in the warp group, and the electrodes (6) are close to each other at both ends of the warp group. The temperature sensor (3) comprises a tape-shaped insulating film (2), or a weft group formed by arranging two rows with one end arranged in a narrow space and the other end arranged in a single row. On the other hand, a heat-sensitive resin (8) in the form of a tape having a width narrower than that of the insulating film (7) is attached to the central portion of one side of the electric field of For the pole (6), the one close to the end or the single row of the two rows with the narrow spacing, the conductive thread (5) is woven into the temperature sensor (3), and the row of the two rows with the narrow spacing is provided. The inner part is not woven into the temperature sensor (3) and is crossed so as to come into contact with the surface not having the heat-sensitive resin (8), and the two rows of electrodes (6) and (6) are arranged at a narrow interval. Conductive yarn in the warp group existing between (2)
Is characterized by the structure of a surface heating element cut by a punch or the like immediately after weaving.

(Operation) In the present invention, by simply adding a cutting process such as a punch in the process of weaving, the heating element and the temperature sensor are electrically connected to the woven electrode (6) while eliminating electrical interference due to mutual feeling. It is possible to make a physical connection, and it is simple enough to connect the conductor to the end of the electrode (6) when connecting to the controller.

(Example) Hereinafter, an example of the present invention will be described with reference to the accompanying drawings.

1 and 2 are organization charts of the weave relating to the surface heating element of each row of the present invention. FIG. 1 shows that the heating element and the temperature sensor (3) share one electrode, FIG. 2 shows that each has its own electrode.

The surface heating element is in the form of a sheet in which a warp group and a weft group are woven in a plain weave. The warp group is composed of an insulating yarn (1) such as polyethylene yarn and a composite material of tetrafluoroethylene resin and conductive carbon. The thin tape-shaped conductive threads (2) for the heating element are arranged alternately or every several wires, and the tape-shaped temperature sensor (3) is sandwiched between the insulating threads (1) and (1). In the state of being, and multiple are arranged at wide intervals,
In the illustrated examples, 275 conductive threads (2) are alternately arranged for 280 insulating threads (1), and the temperature sensor (3) is arranged in place of 10 conductive threads (2). It is interposed between the insulating threads (1) (1).

The temperature sensor (3) includes 28 insulating threads (1) and conductive threads (2) 27.
A total of 55 books are woven one by one and arranged at wide intervals, but as shown in the enlarged cross section in FIG. 5, a tape-shaped insulating film (7), for example, 8 mm wide and 0.3 mm thick Insulating film on the center of one side of polyester film
Heat-sensitive resin in the form of tape that is narrower than (7) (8) For example, width 2
mm, 0.3 mm thick nylon film is laminated structure, the thermosensitive resin consisting of the nylon film (8)
Is 4 when the volume resistivity (Ω · cm) is 20 ℃.
It has a characteristic of changing substantially inversely proportional to 35 and temperature at 07 and 50 ° C.

Next, regarding the weft yarn group, the insulating yarn woven in the warp yarn group
(4) For example, mainly composed of polyethylene yarn, a plurality of conductive yarns (5) in this insulating yarn (4), for example, a copper foil yarn formed by spirally winding a steel foil around a core yarn are arranged next to each other to form the warp group. Band-shaped electrodes (6) woven in are respectively provided at both ends on the cutting side of a warp group formed by cutting into a predetermined length.

The electrodes (6) have two rows at one end of the warp group at narrow intervals close to each other, and have a single row in FIG. 1 and two rows in FIG. 2 at the other end. is doing.

In those electrodes (6), one of the two rows which is closer to the end or which is a single row, the conductive thread (5) made of copper foil thread is replaced with the insulating thread (1) of the warp group as shown in FIG. , The conductive thread (2) as well as the temperature sensor (3) are entwined with plain weave to make the conductive thread (2)
And the temperature-sensitive resin (8) of the temperature sensor (3) are in contact with each other, while the innermost electrode (6) of the two rows is made of the conductive thread as shown in FIGS. 3 and 4. The (5) is entangled with the insulating thread (1) and the conductive thread (2) of the warp group by plain weave, but without interweaving with the temperature sensor (3), the opposite surface without the thermosensitive resin (8) And the conductive thread (5) is a conductive thread.
The (2) is in contact with the thermosensitive resin (8) but is not in contact with the thermosensitive resin (8), and the insulating film (7) is interposed therebetween.

In the surface heating element having the above-mentioned structure, the warp group is further provided with a long blade-shaped punch having an intermittent cutting edge arranged in a direction parallel to the weft yarn during a process immediately after weaving the weft yarn. Punching is performed in synchronization with weaving, and the punches allow two rows of electrodes (6) with narrow intervals.
(6) The electrically conductive yarn (2) in the warp group existing between them is cut.

Note that cutting only the conductive thread (2) is almost impossible, for example, when the conductive thread (2) and the insulating thread (1) are alternately arranged. Therefore, the conductive thread (2) and the insulating thread (2) The purpose is achieved by disconnecting (1) and (5) at the same time so that only the temperature sensor (3) is left so as not to be disconnected.

In this case, since the insulating thread (1) is arranged on both sides of the temperature sensor (3), it is a reliable and easy means to cut the conductive thread (2) without damaging the temperature sensor (3).

By cutting the conductive yarn (2) in this manner, the electrode (6) near the end of the warp group of the two electrodes (6) (6) which are arranged in parallel at a narrow interval has a temperature sensor (3). It goes without saying that the electrode for the conductive thread (2), that is, the electrode for the heating element, becomes the electrode for the conductive thread (2).

The surface heating element having the above-mentioned structure is used by being connected to a control circuit including a comparator (9), an output transistor (10) and a relay (11) as shown in FIG.

In the case of the electrode sharing system illustrated in FIG. 1, a heating element (2H) formed by connecting the conductive yarn (2) in the warp group in parallel between the dedicated electrode (6) and the dual-purpose electrode b is used. A relay (11) having a unipolar contactor and a power switch (12) are connected to a power source through a serial series, while the temperature sensor (3) is connected to a dedicated electrode (6) and a dual-purpose electrode (6). The temperature sensor assembly (3S) formed by connecting in parallel between them is connected in series with the resistor (R ₁ ) to form a voltage dividing circuit, and this voltage dividing circuit is connected to the power source via the power switch (12) in series. Dedicated electrode (6) that serves as a voltage dividing point
Connect the point that becomes equipotential to and to the input terminal of the comparator (9).

The comparator (9) has a variable resistor (R
_The voltage of the reference voltage setting circuit whose element is ₂ ) is input.

On the other hand, the coil (11 _C ) of the relay (11) is the comparator (9).
The output transistor (10) and the power switch (12), which are turned on by the output "H", are connected in series to the power source.

In the case of the electrode-dedicated system shown in FIG. 2, both electrodes of the heating element (2H) are connected to the relay (1
The control mode will be described below with the only difference being that a relay (11) formed by adding a contact shown by a broken line in FIG. 6 is used as long as it is connected to each pole of the power supply through each contact of 1). Content is common to each other.

After turning on the power switch (12), if the temperature of the heating element (2H) is lower than the temperature set by the variable resistor (R ₂ ),
Since the resistance value of the temperature sensor assembly (3S) is large, the input voltage of the input terminal is higher in the comparator (9), and therefore the comparator (9) outputs “H” output,
As a result of turning on the output transistor (10), the relay (1
1 _c ) is excited and energized to energize the heating element (2H).

When the temperature of the heating element (2H) rises, this temperature change is detected by the temperature sensor assembly (3S) and the resistance value decreases, so the input voltage at the input terminal of the comparator (9) is lower. increases, therefore, the comparator (9) output transistor so emit "L" output (10) is turned off operation, energization of the relay (11 _c) is de-energized and the heating element (2H) is disconnected.

In this way, the temperature sensor (3) assembly (3S) detects the average temperature of the heating element (2S) consisting of the conductive thread (2) as a change in resistance, and as a result, constant control of the heating element temperature is performed automatically and automatically. It is stable.

As is apparent from FIG. 6 described above, the control circuit connection to the heating element (2H) and the temperature sensor assembly (3S) may be achieved only by conductive connection to the electrodes (6) and (6). Assembly is very easy and time and labor are saved.

(Advantages of the Invention) The present invention has the configuration and operation described above, and the temperature sensor (3) is simultaneously woven at the time of weaving the surface heating element, and is thin and flexible. Since it is formed in the shape of a tape, there is no unevenness at all, and the final finished product of the surface heating element can have a thin structure, and as a result, it is inexpensive and has a sufficiently high heating performance.

In addition, the present invention is an electrode (6) (6) in which the heating element and the temperature sensor (3) made of the conductive yarn (2) are formed in the woven structure only by adding a cutting step such as punching to the weaving step. Can be connected to the external wiring, and connection with external wiring can be performed easily and quickly at low cost.

Furthermore, the conductive thread (2) and the temperature sensor (3) can be securely and simply interfered with each other without causing electrical interference, and at the same time, the electrode (6 The fact that it is possible to connect with () is remarkable as an epoch-making excellent effect in that it has solved the connection with the electrode which could not be achieved in the past.

[Brief description of drawings]

1 and 2 are schematic organization diagrams according to each example of the present invention, FIG. 3 is an enlarged view of a main part in each example, and FIG. 4 is a sectional view taken along the line IV-IV in FIG. FIG. 5 is an enlarged sectional view of a temperature sensor according to an example of the present invention, and FIG. 6 is an electric control circuit diagram of the same. (1)… Insulation thread. (2) ... Conductive thread, (3) ... Temperature sensor, (4) ... Insulating thread, (5) ... Conductive thread, (6) ... Electrode, (7) ... Insulating film, (8) ... Thermal resin.

Claims (1)

[Claims] 1. A conductive yarn (2) for a heating element is arranged alternately or every several yarns with respect to an insulating yarn (1), and a tape-shaped temperature sensor (3) is sandwiched between the insulating yarns (1). , And a plurality of conductive yarns (5) adjacent to each other in the warp group formed by arranging a plurality of warp groups at wide intervals and a large number of insulating yarns (4) woven into the warp group. It has woven electrodes (6), and the electrodes (6) are close to each other at two rows at both ends of the warp group, or two rows are narrow at one end, and the other is at the other end. Of the weft yarn group formed by arranging the end portions of the insulating film in a single row, and the temperature sensor (3) is a tape-shaped insulating film (7) with the insulating film (7) at the center of one side thereof.
The heat-sensitive resin (8) in the form of a tape having a narrower width than that of the above is bonded together, while the electrode (6) is a conductive thread if it is closer to one end of the two rows at a narrow interval or is a single row. (5) is woven into the temperature sensor (3), and the inner one of the two rows at a narrow interval is not woven into the temperature sensor (3) and the side not having the thermosensitive resin (8) The conductive threads (2) in the warp group existing between the two rows of electrodes (6) and (6) with a narrow interval are cut by a punch or the like immediately after weaving. Characteristic surface heating element.