JPH0650667B2 - Planar heating appliances - Google Patents

Description

TECHNICAL FIELD The present invention relates to a planar heating appliance such as an electric blanket and an electric carpet.

2. Description of the Related Art As shown in FIG. 5, a conventional linear heating element includes a heating wire 49 wound around a core wire 48, an electrical insulator 51 also serving as a temperature fuse, a safety wire 50, and an electrical insulator outside the heating wire 49. 52 forms a linear heating element 53. Further, in the conventional heating appliance using the heating wire, the temperature detecting wire 47 shown in FIG. 4 is required. Therefore, as shown in the wiring of the conventional electric carpet of FIG. 6, two wires, the linear heating element 53 and the temperature detection wire 47, are wired in the carpet main body 54. Further, as shown in FIG. 7, the temperature detection line 4 is used as a control circuit for a conventional heating appliance.
Temperature sensing electrode 4 between the temperature sensing electrodes 43 and 44 of FIG.
A current flows through the neon tube 30 due to a change in the impedance caused by 5 to trigger the thyristor 32, and the charge charged in the capacitor 36 triggers the thyristor 39 in the next half cycle to drive the relay 40, whereby the contact 40-1.
Will be closed and current will flow through the heating wire 49 to heat it. When the heating wire 49 becomes hot due to some abnormality, the electrical insulator 51 also serving as a temperature fuse is melted, and the safety wire 50 and the heating wire 49 are fused to each other, so that a current flows through the heating resistors 56 and 59 through the diodes 57 and 58, and the temperature Fuse 12
Is melted and the power supply 11 is de-energized.

Further, FIG. 8 shows a structural diagram of a linear heating element integrated with another conventional temperature sensing element. Reference numeral 61 denotes a core wire, on which a heating wire 62 is wound, on which a temperature sensitive body 63 is covered, on which a temperature detection electrode wire 64 is wound, and further, an insulating jacket 65 is further covered. Then configured. FIG. 9 shows a control circuit using this linear heating element, and FIG. 10 shows the waveform of each part. The control circuit performs power supply control with a half-wave of alternating current as a power supply period to the heating element 62, and uses another half-wave of the power supply period as a temperature signal detection period from the temperature sensing element 63 to detect the temperature during the power supply period. The temperature signal from the heating element is turned off.

Another conventional example is shown in FIG. (Japanese Examined Patent Publication No. 40-19414) E is a power source that heats a blanket or the like by passing the power source through a heating wire 71 in the dotted line in the figure. The heating line 75 is connected in series with the detection line 73, and the detection line 72 is connected through the fixed resistor R and then the rectifier S. The other end of the detection line 72 is connected to the base of the transistor Tr via the discharge tube Ne.

Problems to be Solved by the Invention In such a conventional one as shown in FIG. 5, when it is used for a multi-divided planar heating appliance, since the temperature detection line 47 is also required, the number of lines increases and the wiring becomes complicated. It is very difficult to technically evenly wire the linear heating elements, and it is very difficult to uniformly wire the temperature detection lines 47 that detect heat from the linear heating elements. It is also costly.

In FIG. 8, the structure of the linear heating element is simple, but the other half wave of the power feeding period to the heating wire 62 is used as the temperature signal detection period from the temperature sensing element 63, and the temperature signal during the power feeding period is changed. OF
Since it is set to F, the circuit configuration is very complicated, the number of parts is large when it is actually commercialized, and since there is no safety wire, it is difficult to cut off the power when the heating wire abnormally heats.

Further, in the case of FIG. 11, since the heating wire 75 and the detection wire 73 are connected in series, the main current of the heating wire 75 flows through the detection wire 73. In the configuration of the heating wire 75, the detection wire 73 and the heating wire 7
Since 5 are facing each other with the insulator sandwiched in one sheet of paper, abnormal heating occurs when a large amount of current is passed. An electric blanket can have a current of about 1 amp, but a carpet cannot be used because a current of 6 to 12 amp flows. If the contact K of the relay Re is welded, the detection line 73 and the heating line 75 remain energized regardless of whether the transistor Tr is on or off, and there is a risk of fire or the like.

Further, in the case of a multi-divided carpet, there is a problem that there is a large temperature difference between when the 1/4 surface is used and when the entire surface is used.

The present invention has been made in view of the above points, and an object thereof is to provide a simple multi-divided planar heating appliance using the linear heating element having an integral structure.

Means for Solving the Problems Providing between the second signal line and the first signal line and the heating line,
A heat sensitive body having a temperature fuse function that melts when a predetermined temperature is reached and a negative temperature resistance characteristic is provided between the signal line and the first signal line, and between the heating line and the second signal line, and A linear heating element provided with an electric insulator on the outer side and having an integrated structure is provided at each divided portion of the multi-divided planar heating appliance, and the first signal line of each divided portion is connected in series to form a second signal line. Is connected to one end of the power supply, the heating wires are respectively connected in parallel to the power supply, and the first and second signal lines are connected so that the current of the heating wire does not flow, and are connected in series to the first signal wire. The temperature setting resistors of each division are connected.

Action According to the present invention, as soon as the first signal line is broken due to the above-mentioned configuration, the power supply to the heating wire is cut off. Further, it is sufficient to wire only the linear heating element having an integrated structure, and uniform wiring can be easily performed on the entire surface. Further, due to the abnormal heating of the heating wire, the temperature sensitive body melts and the second signal wire and the first signal wire come into contact with each other, and the current flows through the heating resistance, so that the heating resistance generates heat and is thermally coupled. A control circuit that melts the temperature fuse and stops energization can be easily configured. Also, since the current of the heating wire is not sent to other signal wires, abnormal heating is less likely to occur,
Further, since the temperature setting resistors of the respective divided portions are connected in series to the first signal line, respectively, a comfortable carpet can be obtained in which there is almost no temperature difference between when the 1/4 portion is used and when the entire surface is used.

FIG. 2 is a structural diagram showing an embodiment of the present invention. In FIG. 2, 1 is a core wire, 2 is a first signal line, and 3 is a temperature sensitive body such as a plastic thermistor having a negative impedance change with respect to a temperature change, and also functions as a temperature fuse during abnormal heating. 4 is a second signal line that also serves as a temperature detecting electrode, 5 is a heating wire, 6 and 7 are electrical insulators such as vinyl chloride, and 8 is a linear heating element of an integrated structure in which all of these are one wire Is.

FIG. 3 is a wiring diagram of a four-divided electric carpet of an embodiment of a multi-divided planar heating apparatus using the linear heating element of the present invention.
Reference numeral 9 is a carpet material, and 10 is a controller.

FIG. 1 is an embodiment of the control circuit of FIG. In FIG. 1, 11 is a power source, 12 is a thermal fuse, and a heating resistor 1
Thermally coupled with 7. 13 is a power switch, 14 is a pilot lamp for displaying the state of the power switch,
Reference numeral 15 is a current limiting resistor and 16 is a diode.
The reverse current is blocked so that the heating resistor 17 generates heat only when is melted. 18 is a temperature adjustment variable resistor, 19 and 2
0, 21, 22 are resistors 23-1, 23-2, 24-1, 24-2, 25- for setting the temperature according to each division.
Reference numerals 1, 25-2, 26-1 and 26-2 are area changeover switches, and 23-1 and 23-2 are interlocked with each other, and others are interlocked with each other. 27, 36 are capacitors, 28, 31, 33, 3
5, 37 and 38 are resistors, 29 is a pulse transformer, 30 is a neon tube, 32 and 39 are thyristors, 34 and 41 are diodes, and 40 is a relay.

Next, the operation will be described.

Power switch 13 is ON, area switch 23 is ON
At this time, since the surface temperature of the carpet is low, the impedance of the temperature sensitive body 3 is large, and the combined resistance of the temperature adjusting variable resistor 18 and the resistor 19 and the first signal line 2 and the second signal line are positive in a positive half cycle. The divided voltage between the impedance of the temperature sensing element 3 between 4 is large, and since the discharge voltage of the neon tube 30 is exceeded, a current flows to the primary side of the pulse transformer 29 through the capacitor 27 and the resistor 28, and The voltage generated on the secondary side triggers the thyristor 32 through the resistor 31 so that the thyristor 32 becomes conductive and the diode 3
4, a current flows through the capacitor 36, the resistor 37, and the resistor 33 to charge the capacitor 36, and in the next negative half cycle, the capacitor 36 to the resistor 35, the gate of the thyristor,
The thyristor 39 is triggered near the zero cross by discharging through the cathode and the resistors 33 and 37, and the relay 4
0 is turned on, the relay contact 40-1 is turned on, and the heating wire 5 is energized.

Even when the heating wire 5 is energized, the first signal wire 2 and the heating wire 5
Since the second signal line 4 between the two is connected to one end of the power source 11, it is kept at the same potential at any position. Therefore, the potential gradient generated in the heating line 5 is the same as that of the first signal. It does not affect the temperature signal flowing from the line 2 through the temperature sensitive body 3 to the second signal line 4 which also serves as the temperature detecting electrode.

When the temperature of the carpet rises above the temperature setting of the temperature adjustment variable resistor 18, the impedance of the temperature sensing element 3 decreases, so the combined resistance of the temperature adjustment variable resistor 18 and the resistor 19 and the impedance of the temperature sensing element 3. The divided voltage between the two becomes lower than the discharge voltage of the neon tube 30, no pulse is generated in the pulse transformer 29, and the thyristors 32 and 39 are turned off.
FF, relay 40 is turned off, relay contact 40
-1 is opened, the heating wire 5 is de-energized, the carpet temperature is lowered, and the temperature is controlled. Area change switch 2
Even if 4, 25, and 26 are in the ON state, the same control is performed.

Also, if the first signal line is disconnected at two or more places in the same divided portion, the impedance of the temperature sensitive body 3 becomes high, and the temperature of the carpet is controlled in the same manner as when the temperature becomes low, preventing the carpet temperature from becoming abnormally high. Therefore, even if the wire is disconnected at one place, the discharge voltage of the neon tube 30 becomes less than the discharge voltage, and the relay 40 immediately becomes OF.
After that, the electricity to the heating wire 5 is cut off.

Further, when the heating wire 5 is abnormally heated, the temperature sensitive body having the temperature fuse function is melted, so that the first signal wire 2
And the second signal line 4 are fused to each other, and the power source 11 passes through the second signal line 4 and the first signal line 2 to generate heat from the heating resistor 17, the diode 16, the power switch 13, the thermal fuse 12, and the power source 1.
When a current flows through the other side of 1, the thermal fuse 12 which is heated and thermally coupled works to cut off the power supply to the carpet.

The circuit is the same even if the first signal line and the second signal line are used interchangeably.

EFFECTS OF THE INVENTION As described above, according to the present invention, not only the disconnection detection of the first signal line and the cutoff of the power source at the time of abnormal heating can be configured very simply, but also the line-shaped heating line having an integrated structure can be used for wiring. In addition, the circuit configuration for controlling the temperature without being affected by the energization of the heating wire is simple, the cost is low, and it is very useful. Further, since the current of the heating wire is not passed through the other signal wires, abnormal heating is unlikely to occur. Further, since the temperature setting resistors of the respective divided portions are connected in series to the first signal line, a comfortable carpet can be obtained in which there is almost no temperature difference between when the 1/4 surface portion is used and when the entire surface is used.

[Brief description of drawings]

FIG. 1 is a control circuit diagram of an embodiment of the present invention, FIG. 2 is a structural diagram of the linear heating element, FIG. 3 is a wiring diagram of an electric carpet using the linear heating element, and FIG. FIG. 5 is a structural diagram of a conventional temperature detecting wire, FIG. 5 is a structural diagram of a conventional linear heating element, FIG. 6 is a wiring diagram of a conventional electric carpet, FIG. 7 is a control circuit diagram of a conventional heating appliance, and 8 FIG. 9 is a structural diagram of another conventional linear heating element, FIG. 9 is a control circuit diagram using the linear heating element of FIG. 8, and FIG. 10 is a waveform diagram of each part of FIG. FIG. 11 shows a temperature control circuit using another conventional heating wire. 2 ... First signal line, 3 ... Temperature sensor, 4 ... Second signal line, 5 ... Heating line, 6, 7 electrical insulator, 11 ... Power supply,
12 ... Thermal fuse, 17 ... Heat resistance.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shoho Katayama 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) Reference JP-A-59-173987 (JP, A) JP-B-40- 19414 (JP, B1)

Claims (2)

[Claims] 1. A thermal fuse, wherein a second signal line is provided between a first signal line and a heat generating line, and melts between a second signal line and a first signal line when a predetermined temperature is reached. A linear heating element having a function and a negative temperature resistance characteristic is provided, and an electric insulator is provided between the heating wire and the second signal line and on the outermost side to form a multi-divided planar heating device. The first signal line of each divided part is connected in series, the second signal line is connected to one end of the power source, and the heating line is connected in parallel to each power source and A planar heating appliance, characterized in that the signal line and the second signal line are connected so that the current of the heating line does not flow, and the temperature setting resistors of the respective divisions are connected in series to the first signal line. 2. A heating resistor is connected in series with the first signal line or the second signal line, and a thermal fuse connected in series with a power source is thermally coupled to the heating resistor.
The planar heating appliance as described in the item.