JPH06102942A - Temperature controller - Google Patents

Abstract

PURPOSE:To provide an inexpensive and highly safe temperature controller which can detect uniform temperature even at the conduction time of a heater and in which only one heating resistor for maintenance when temperature abnormally rises is required. CONSTITUTION:A thermosensitive heater line 10 where a heating conductor 6 is arranged at the inner side or the outer side of a pair of electrode lines 2 and 4 sandwiching a cylindrical hot-melting temperature-sensing body 3 between them through a non-hot-melting resin layer 5 is used and an electrode used for temperature detection and safe operation when temperature abnormally rises is separated from the heating conductor 6. Thus, temperature can uniformly be detected even if the heating conductor 6 is being conducted. Since only one resistor 14 fusing a temperature fuse 13 when the temperature of the heating conductor 6 abnormally rises is required, the temperature controller can be made miniature and cost can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature control device used for a flat electric heating tool such as an electric carpet.

[0002]

2. Description of the Related Art In recent years, planar electric floor heating having comfort and safety without exhaust gas has become popular. The configuration of a conventional temperature control device used for a planar electric heating tool will be described below with reference to the drawings.

FIG. 3 shows a structure of a temperature sensitive heater wire used in a conventional temperature control device for an electric heating tool, and FIG. 4 shows a structure of a temperature control device using the temperature sensitive heater wire shown in FIG. As shown in FIG. 3, a conventional temperature control device (for example, disclosed in Japanese Patent Laid-Open No. 1-7112) is arranged such that the core yarn 21 is fed from the center portion.
As shown in FIG. 4, a temperature-sensitive heater wire 27 having a structure in which a spiral electrode wire 22, a heat-meltable temperature sensitive body 23, a spiral heat-generating conductor wire 24, a separation layer 25, and an insulating jacket 26 are sequentially provided on the upper surface is used. In addition, one end of the electrode wire 22 is connected to the cathode of the diode 28 via the resistor 29 which is thermally coupled to the thermal fuse 34,
The anode of the diode 28 is connected to the power supply via the thermal fuse 34, and the other end of the electrode wire 22 is connected to the thermal fuse 34.
The temperature detecting means 31 is connected to the cathode of the diode 33 via a resistor 30 which is thermally coupled to the anode of the diode 33 is connected to the other end of the power source, and the heating conductor wire 34 has one end of the temperature fuse 34 and the diode 28. The circuit is connected to the connection point with the anode, and the other end is connected to the power supply ground side through the power control means 32.

A conventional temperature control device of this type detects a temperature change in the impedance of the heat-meltable temperature sensing element 23 sandwiched between the heating conductor wire 24 and the electrode wire 22 as a voltage change by the temperature detecting means 31, With this voltage, the power control means 32 controls the energization of the heating conductor wire to control the temperature. Further, when the temperature of the heat-sensitive heater wire 27 rises abnormally, such as when local heat retention and a failure of the temperature detection means 31 occur at the same time, the heat-meltable temperature sensitive body 2
When 3 is melted and the heating conductor wire 24 and the electrode wire 22 come into contact with each other, the resistor 29 or 30 generates heat, and the thermal fuse 34 is melted to stop the energization of the heating conductor wire 24 to ensure safety. Has been secured.

As shown in FIG. 4, when the power control means 32 is energized to the heating conductor wire 24, the detected temperature differs depending on the location of the heat sensitive heater wire 27. Since the point A of the heating conductor wire 24 is connected to the power source side and the point B is connected to the power source ground side, a potential gradient is created between the points A and B, and the potential applied to the heat-melting temperature sensitive body 23 is at a location. It is due to the difference. Therefore, when the heat generation conductor wire 24 is generating heat by the power control means 32, even if the temperature at the point B side rises due to local heat retention, this cannot be detected, and the temperature at that point rises abnormally. In order to avoid this abnormal temperature rise, the heat-sensitive heater wire 27 is reciprocated in parallel and wired, or the temperature is detected by stopping the energization of the heating conductor wire 24 at regular intervals to ensure safety. There is.

Furthermore, the local heat retention and temperature detection means 31
In order to avoid the influence of the potential gradient in the operation when the heat-sensitive material 23 is melted, such as when the failure occurs at the same time, the heating conductor wire 24 and the electrode wire 22 contact each other to heat the resistor, The thermal fuse 34 that is thermally coupled to this is blown to stop the energization. In this operation, for example, when the temperature at the point B side abnormally rises due to local heat retention, the thermosensitive material 23 melts, and the heating conductor wire 24 at the point B.
And the electrode wire 22 come into contact with each other. In this case, since the heating conductor wire 24 has a potential gradient because it is being energized, and there is almost no potential difference between both ends of the resistor 30 connected to the B side, no current flows through the resistor 30 and the resistor 30 No fever. Therefore, the resistor 29 is connected to the point A side of the electrode wire 22 to generate heat and blow the thermal fuse 34. Similarly, if an abnormal temperature rise occurs on the point A side, the resistor 29
Does not generate heat, the resistor 30 generates heat, and the thermal fuse 34 is melted and the power is cut off to ensure safety.

[0007]

However, in such a conventional structure, one of the electrodes used for temperature detection is constituted by the heating conductor wire 24, and there are the following problems.

When the heating conductor wire 24 is energized, a potential difference occurs in the heating conductor wire 24 depending on the location, so that the detected temperature varies depending on the location of the heat-sensitive heater wire 27. In order to avoid this, it is necessary to reciprocate the heat-sensitive heater wire 27 in parallel and wire it, or to stop the energization of the heating conductor wire 24 at regular intervals to detect the temperature. If the heat-sensitive heater wire 27 is reciprocally wired in parallel, the total length of the heat-sensitive heater wire 27 becomes longer and man-hours increase, and the cost increases.

Further, there is a problem that two resistors 29 and 30 are required to stop the energization when the abnormal temperature rises due to thermal coupling with the thermal fuse 34 due to the potential difference in the heating conductor wire 24. The resistor used at this time is large because it requires a large withstand power. Normally, it is molded with resin or cement together with the thermal fuse as a thermal fuse block, but since a large resistor must be used, this block becomes large,
There are problems that the cost becomes high and that the control circuit is hindered from being miniaturized.

The present invention is intended to solve the above-mentioned problems. The temperature of the entire heat-sensitive heater wire can be detected uniformly even when the heat-generating conductor wire is energized, and the heat-generating resistance during abnormal temperature detection operation is 1 It is an object of the present invention to provide a temperature control device which is inexpensive and can miniaturize a control circuit.

[0011]

In order to solve the above-mentioned problems, the temperature control device of the present invention is provided with a pair of electrode wires on the inner surface and the outer surface of a cylindrical heat-melting temperature-sensitive body, which is not in contact with one of the electrode wires. A heat-sensitive heater wire having a heat-melting resin layer and a heat-generating conductor wire provided through a non-heat-melting resin layer, and a power control for turning on / off the power supply to both ends of the power supply A series circuit is connected to the means, and one of the electrode wires is connected to the connection point of the thermal fuse and the heating conductor wire via a resistor thermally coupled to the thermal fuse, and the other one of the electrode wires is connected.
Opposite to the temperature detecting means and the temperature detecting means for converting the current flowing between the electrode lines into a temperature signal and outputting the temperature signal to the power control means in either positive or negative cycle of the power supply between the connection point between the book and the power supply and the power control means. A diode is connected so that a current flows in the direction.

[0012]

According to the above construction, the heating wire independent of the heating conductor wire is used.
The temperature is detected by the temperature change of the impedance of the pair of electrode wires and the heat-melting temperature sensor placed between them, and when abnormal heat is generated, the heat-melting temperature sensor melts and the electrodes heat up, causing the resistor to generate heat. However, the thermal fuse thermally coupled to this resistor is blown.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A temperature control device according to an embodiment of the present invention will be described below with reference to the drawings. The structure of the heat sensitive heater wire of this embodiment is shown in FIG. As shown in the figure, the first electrode wire 2 is spirally arranged on the core yarn 1, the thermomelting temperature sensitive body 3 is covered on the outer side thereof, and the second electrode wire 4 is spirally formed on the outer side thereof. The heat-dissipating resin layer 5 is provided on the outer side of the insulating layer, the heating conductor wire 6 is provided on the outer side thereof in a spiral shape, and the separation layer 7 and the insulating outer layer 8 are provided on the outer side thereof. ing. FIG. 2 shows the configuration of the temperature control device of this embodiment. As shown in the figure, the electrode wire 4 of the temperature-sensitive heater wire 10 is connected to one of the power supply lines via the resistor 7 and the temperature fuse 13 thermally coupled to the resistor 7, and the electrode wire 2 of the temperature-sensitive heater wire 10 is connected. Is connected to the temperature detecting means 11 and the anode of the diode 9, and the cathode of the diode 9 is connected to the other of the power supply lines, and the energization is controlled by the heating conductor wire 6 of the temperature sensitive heater wire 10 and the temperature signal of the temperature detecting means 11. A series circuit with the power control means 12 is connected between the connection point of the thermal fuse 13 and the resistor 14 and the cathode side of the diode 9 of the power supply line.

When the temperature of the heat-sensitive heater wire 10 changes during normal temperature control, the impedance between the electrode wires 2 and 4 that sandwich the heat-melting temperature-sensitive body 3 changes, and the change in the current during the negative cycle of the power supply changes with temperature. The detecting means 11 converts the voltage into a voltage corresponding to the detected temperature. The power control means 12 compares this voltage with a preset voltage to control the energization of the heating wire conductor wire 6 to control the temperature. Since the electrode wires 2 and 4 used for temperature detection are sandwiched by the non-heat-melting resin 5 between the heating conductor wires 6, they are hardly affected by the potential gradient of the heating conductor wires 6 regardless of the energized state. Uniform temperature detection is possible in the entire area of the heat-sensitive heater wire 10.

Further, if the temperature of the heat-sensitive heater wire 10 rises abnormally due to local heat insulation and circuit failure, etc., heat is transferred to the heat-meltable temperature sensitive body 3 through the non-heat-meltable resin 5, and The fusible temperature sensitive element 3 melts and the electrode wire 2
And 4 come into contact. At this time, a power supply voltage is applied to the resistor 14 and the diode 9, and a large current flows through the resistor 14. The resistor 14 generates heat due to the flow of a large current, and the thermal fuse 13 that is thermally coupled to the resistor 14 is melted and blows off.
Stop energizing to. Also at this time, since the electrode wires 2 and 4 are sandwiched by the non-heat-melting resin 5 between the heating conductor wire 6, there is no influence of the potential gradient of the heating conductor wire 6, and one resistor is used. 14 makes it possible to perform a safe operation even when the temperature rises abnormally in the entire heat-sensitive heater wire 10. The same operation can be performed even when the electrode wires 2 and 4 are used interchangeably.

In this embodiment, the heat-meltable temperature sensitive body 3 and the heat-sensitive heater wire in which the heat-generating conductor wire 6 is arranged outside the electrode wires 2 and 4 are used. A heat sensitive heater wire in which the body 3 and the electrode wires 2 and 4 are arranged may be used.

[0017]

As is apparent from the above description of the embodiment, according to the present invention, the temperature detecting wire and the heat generating conductor wire are integrated,
The electrode wire used for temperature detection and abnormal temperature rise detection of the heat-sensitive heater wire was separated from the heat-generating conductor wire even though it was a one-wire type heat-sensitive heater using a heater that did not need to be individually wired. According to this configuration, since the current flowing through the electrode wire is not affected by the energization state of the heating conductor wire, it is possible to detect the temperature uniformly over the entire heat sensitive heater regardless of whether the energization state of the heating conductor wire is on or off. In addition, one large resistor was conventionally required for safe operation when the heat-sensitive heater melts due to abnormal temperature rise due to localized heat retention and circuit failure. Therefore, it is possible to configure a temperature control device which is low in cost, space-saving and highly safe.

[Brief description of drawings]

FIG. 1 is a side view showing a configuration of a heat-sensitive heater wire according to an embodiment of the present invention.

FIG. 2 is a circuit diagram showing a configuration of the temperature control device.

FIG. 3 is a side view showing a configuration of a conventional heat-sensitive heater wire.

FIG. 4 is a circuit diagram showing a configuration of the temperature control device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Core yarn 2 Electrode wire 3 Thermofusible temperature sensitive body 4 Electrode wire 5 Non-thermofusible resin layer 6 Exothermic conductor wire 7 Separation layer 8 Insulation jacket 9 Diode 10 Temperature sensitive heater wire 11 Temperature detection means 12 Power control means 13 Thermal fuse 14 resistor 15 power supply

Claims (1)

[Claims] 1. A pair of electrode wires are provided on an inner surface and an outer surface of a cylindrical heat-meltable temperature sensitive body, a non-heat-meltable resin layer is provided in contact with one of the electrode wires, and the non-heat-meltable resin layer is interposed therebetween. A heat sensitive heater wire provided with a heating conductor wire, a temperature fuse at both ends of a power source, a series circuit of the heating conductor wire and a power control means for turning on / off the power supply to the heating conductor wire are connected, and the temperature fuse and the above Any one of the electrode wires is connected to a connection point of the heating conductor wire via a resistor thermally coupled to the thermal fuse, and the other one of the electrode wires is connected to the power supply and the power control means. Between the points, a temperature detection unit that converts a current flowing between the electrode lines into a temperature signal and outputs the temperature signal to the power control unit in either positive or negative cycle of the power source, and a current in a direction opposite to the temperature detection unit. Temperature control device with a flowing diode.