JPH10289779A - Temperature and pressure sensing cable and heater using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To concurrently detect the temperature and pressure with a single wire by concentrically laying a pressure-sensing element, an outer pressure sensing electrode, a separation layer, an inner temperature sensing electrode, a temperature-sensing element and an outer temperature sensing electrode respectively in order on the external surface of an inner pressure sensing electrode laid at a center, and externally covering the electrodes and sensing elements with an insulation material. SOLUTION: A pressure-sensing element 7 is preferably made of a pressure sensing polymeric composition, and a temperature-sensing element is preferably made of a polyvinyl chloride composition or a polyamide composition. For example, the pressure-sensing element 7 is laid outside an inner pressure sensing electrode 6 which is made of a nickel-plated copper wire. Also, this pressure-sensing element 7 is molded by extruding poly-2-vinylidene fluoride-3, capable of showing a polarizing function without drawing, and an outer pressure sensing electrode 8 made of a copper foil is laid outside the pressure-sensing element 7. A conductive separation layer 9 made of a shield braided copper wire, an insulating separation layer 10 of a polyester film, an inner temperature sensing electrode 2 of nickel plate copper wire, a temperature-sensing element 3 of a polyvinyl chloride composition, and an outer temperature sensing electrode 4 of a nickel plated copper wire are provided outside the outer pressure sensing electrode 8, and covered with a polyvinyl chloride skin 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible temperature and pressure sensor such as an electric heater.

[0002]

2. Description of the Related Art A conventional sensor for simultaneously detecting the temperature and pressure of this kind of cable has not been devised, and is disclosed in Japanese Patent Application Laid-Open No. 8-31608 as a temperature-sensitive heater.
As a pressure-sensitive sensor, only a pressure-sensitive heater is disclosed in JP-A-62-15793 and JP-A-62-281288. Hereinafter, the configuration of the temperature-sensitive heater will be described with reference to FIG. As shown in FIG. 3, 1 is a porous polyester core yarn, 2
Is an inner temperature-sensitive electrode made of a copper electrode wire, 3 is a polymer thermosensor,
Reference numeral 4 denotes an outer thermosensitive electrode, and reference numeral 5 denotes a polyvinyl chloride shell. As described above, the polymer thermosensitive body 3 is interposed between the inner thermosensitive electrode 2 and the outer thermosensitive electrode 4 so that heat generation and temperature detection are performed, and thus the thermosensitive heater is realized.

[0003]

However, the conventional temperature-sensitive heater cannot detect the pressure only by detecting the temperature. Therefore, when both the temperature and the pressure are required to be detected, the temperature sensor is separately provided together with the temperature sensor. There was a problem that a pressure sensor had to be provided.

[0004]

According to the present invention, in order to solve the above-mentioned problems, a temperature-sensitive function section and a pressure-sensitive function section are incorporated in one flexible cable.

[0005] Since the apparatus has a temperature-sensitive function section and a pressure-sensitive function section, temperature detection and pressure detection can be performed simultaneously with one line.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention has a temperature-sensitive function part and a pressure-sensitive function part in one flexible cable.
Since the impedance between the pair of electrodes facing the flexible thermosensor changes accurately and sharply with the temperature, the temperature can be detected. Further, since the potential between the pair of electrodes facing the flexible pressure-sensitive body changes instantaneously and sharply with respect to the pressure, the pressure can be detected. Since these two functions are configured in one flexible cable, temperature detection and pressure detection can be performed simultaneously with one line.

An embodiment of the present invention will be described below with reference to the drawings. (Embodiment 1) FIG. 1 is a sectional view of a main part of a first embodiment of the present invention.

In FIG. 1, reference numeral 6 denotes an inner pressure-sensitive electrode made of a stranded nickel-plated copper wire. Reference numeral 7 denotes a piezoelectric body made of a piezoelectric polymer, which is extruded at a temperature of 220 ° C. using poly (vinylidene fluoride-3-fluoride) which is non-stretchable and polarizable, and a layer having a thickness of 0.35 mm is formed. It was formed in a core circle. Reference numeral 8 denotes a conductive separation layer made of a copper foil. Reference numeral 9 denotes an outer pressure-sensitive electrode made of a shield-knitted copper wire, which is formed concentrically with the inner pressure-sensitive electrode 6 with a piezoelectric body 7 interposed therebetween. The electrode 6 and the electrode 9 form a piezoelectric electrode. Reference numeral 10 denotes an insulating separation layer made of a polyester film. Reference numeral 2 denotes a temperature-sensitive electrode inside the temperature-sensitive portion, which is provided by spirally winding a nickel-plated copper wire around the separation layer.
Reference numeral 3 denotes a polymer thermosensitive body made of a polyvinyl chloride composition, which contains a sensitizer such as a perchlorate and a heat stabilizer. Reference numeral 4 denotes a temperature-sensitive electrode outside the temperature-sensitive portion, which is provided by winding a nickel-plated copper wire in a spiral shape outside the temperature-sensitive body. The electrode 2 and the electrode 4 form a temperature-sensitive electrode. 5 is a polyvinyl chloride insulating jacket.

That is, according to the present invention, a pressure sensitive body is provided concentrically on the outer periphery of an elongated center conductor, an outer conductor is provided concentrically on the outer periphery of the pressure sensitive body, and a separation layer is provided on the outer periphery of the outer conductor.
Further, an electrode is provided outside thereof, a temperature sensing element is provided outside the electrode, an outer conductor is provided concentrically outside the temperature sensing body, and an outer periphery of the outer conductor is covered with an insulating material to have a diameter of 3.6.
It is configured to be 5 mm. The copper foil 8 may be omitted if sufficient piezoelectric sensitivity is obtained. Inner pressure-sensitive electrode 6
Of course, a metal wire or foil wound around a polyester core wire may be used.

Next, in order to form an electret, a DC voltage of 40 KV / m is applied between the inner pressure-sensitive electrode 6 and the outer pressure-sensitive electrode 9.
m was applied in a silicone oil bath for 30 minutes to perform a poling treatment to obtain a flexible temperature-sensitive element.

Next, the operation and operation will be described. A pressure is detected at a temperature of 20 to 100 ° C. by an internal pressure-sensitive portion formed by the inner pressure-sensitive electrode 6, the pressure-sensitive body 7, and the outer pressure-sensitive electrode 9. Since the impedance changes sharply due to the temperature dependence of ionic conduction in the temperature range of 30 to 100 ° C. in a temperature sensing portion formed by the temperature sensing electrode 2, the temperature sensing element 3, and the outside temperature sensing electrode 4, The pressure and the temperature can be detected simultaneously by the line.

In this embodiment, the pressure sensitivity was determined by placing a trial product of 2 cm in length horizontally on a fixing jig, and mounting a steel ball having a diameter of 11 mm and a weight of 5.4 g from a height of 10 cm.
When the voltage generated by the electrodes provided on both sides of the prototype was measured by an oscilloscope, the distance ΔVmax between the maximum generated voltage value and the minimum generated voltage value was 150.
mV was obtained. When the measurement temperature was changed and the same examination was performed,
It was constant from 20 ° C to 100 ° C. Next, the temperature dependence of the impedance provided on both surfaces of the electrode thermosensitive body is 40.
It was obtained 14000K in value representing a thermistor B constant calculated based on the results of measurement of the impedance Z ₈₀ of the impedance Z ₄₀ and 80 ° C. at ° C.. Thus, pressure-sensitive temperature-sensitive characteristics were confirmed.

(Embodiment 2) FIG. 2 is a sectional view of a main part of a second embodiment of the present invention. The second embodiment is different from the first embodiment in that the outer pressure sensing electrode 9 of the pressure sensing portion is shared with the inner temperature sensing electrode 2 of the temperature sensing portion in FIG. It is in. Therefore, the outer pressure-sensitive electrode 9 and the conductive separation layer were electrically short-circuited using the conductive film 11 as the conductive separation layer instead of the insulating separation layer 10. The components having the same reference numerals as those in the first embodiment have the same function or structure,
Description is omitted.

Next, the operation and operation will be described with reference to FIG.
, 12 is a polyester core yarn, 6 is an inner pressure-sensitive electrode wound inside, 7 is a pressure-sensitive body made of a piezoelectric ceramic rubber composition, and 8 is a copper foil. Reference numeral 9 denotes an outer pressure-sensitive electrode made of a shield-knitted copper wire, and also serves as an inner electrode of the temperature-sensitive body 3. The electrode 6 and the electrode 8 form a piezoelectric electrode as in the first embodiment. 1
Reference numeral 1 denotes a separation layer of a conductive polyester film, 3 denotes a nylon composition thermosensor, 4 denotes an outer thermosensor, and the outer pressure-sensitive electrode 9 and the inner thermosensor 4 are connected to the thermosensor 3.
Electrodes are formed. 5 is a polyvinyl chloride insulating jacket. Next, a poling process was performed between the inner pressure-sensitive electrode 6 and the outer pressure-sensitive electrode 9 for electretization in the same manner as in Example 1 to produce a flexible temperature-sensitive pressure-sensitive element.

Next, the operation and operation will be described. A pressure is detected at a temperature of 20 to 120 ° C. by an internal pressure-sensitive portion formed by the inner pressure-sensitive electrode 6, the pressure-sensitive body 3 and the outer pressure-sensitive electrode 9. The impedance changes sharply due to the temperature dependence of ionic conduction in the temperature range of 30 to 120 ° C. in the temperature sensing portion formed by the pressure sensing electrode 9, the temperature sensing element 3 and the outer temperature sensing electrode 4. The pressure and the temperature can be detected simultaneously by the line. In this example, it was confirmed that the same results as in Example 1 were obtained for the pressure sensitivity and the temperature sensitivity. The pressure-sensitive electrode inside the pressure-sensitive portion may be a nickel-plated copper stranded wire as in the first embodiment, and has the same function as a flexible conductive metal wire. The conductive separation layers 8 and 11 may be omitted if there is no problem in processing.

Example 3 The temperature-sensitive and pressure-sensitive cable obtained in Example 1 or Example 2 was arranged on a flat surface together with a heater to prepare a heating device or bedding such as an electric carpet or a heating mat. In this configuration, the pressurized state changes depending on whether or not there is a person. Therefore, control of the heater power supply and temperature control can be appropriately performed, and convenience and energy saving can be improved.

[0017]

As described above, according to the present invention, the temperature sensing unit and the pressure sensing unit are incorporated in one flexible cable, so that the temperature detection and the pressure detection can be performed by one line. At the same time. In addition, since it is a string having flexibility, there is an effect that wiring convenience is good. When this temperature-sensitive pressure-sensitive cable is used for a heating device such as an electric carpet or a heating mat, control of a heater power supply and temperature control can be performed by pressurization, so that excellent convenience and energy saving can be provided.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a temperature-sensitive pressure-sensitive cable according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a main part of a temperature-sensitive pressure-sensitive cable according to a second embodiment of the present invention.

FIG. 3 is a sectional view of a main part of a conventional temperature-sensitive pressure-sensitive cable.

[Explanation of symbols]

 2 inner temperature-sensitive electrode 3 temperature-sensitive body 4 outer temperature-sensitive electrode 5 polyvinyl chloride jacket (insulating material) 6 inner pressure-sensitive electrode 7 pressure-sensitive body 8 outer pressure-sensitive electrode 10 separation layer

Claims (7)

[Claims] A temperature-sensitive pressure-sensitive cable in which a temperature-sensitive body and a pressure-sensitive body are incorporated in one cable. 2. A pressure-sensitive body is provided concentrically on the outer periphery of an inner pressure-sensitive electrode provided at the center, an outer pressure-sensitive electrode is provided on the outer periphery of the pressure-sensitive body, and a separation layer is provided on the outer periphery of the outer pressure-sensitive electrode. Provided, further provided with an inner temperature-sensitive electrode outside the separation layer, provided with a temperature-sensitive body outside thereof, provided with an outer temperature-sensitive electrode outside the temperature-sensitive body,
A temperature-sensitive pressure-sensitive cable in which an outer periphery of the outer temperature-sensitive electrode is covered with an insulating material. 3. A pressure-sensitive body is provided concentrically on the outer circumference of an inner pressure-sensitive electrode provided at the center, an outer pressure-sensitive electrode is provided on the outer circumference of said pressure-sensitive body, and a temperature-sensitive body is further provided outside thereof. A temperature-sensitive pressure-sensitive cable in which an outer temperature-sensitive electrode is provided outside a temperature-sensitive body, and an outer periphery of the outer temperature-sensitive electrode is covered with an insulating material. 4. A temperature-sensitive pressure-sensitive cable according to claim 2, wherein the pressure-sensitive body is a pressure-sensitive resin. 5. The temperature-sensitive pressure-sensitive cable according to claim 2, wherein the pressure-sensitive body is a pressure-sensitive polymer composition. 6. The temperature-sensitive pressure-sensitive cable according to claim 2, wherein the temperature-sensitive body is a polyvinyl chloride composition or a polyamide composition. 7. A warming tool comprising the temperature-sensitive pressure-sensitive cable according to any one of claims 2 to 6.