JPH04206490A - Electric heater - Google Patents

Abstract

PURPOSE:To prevent abnormal heating of a heater wire by designing the bending durability strength of a safety circuit wire built in a multicore cord stronger than the bending durability strength of a heater circuit wire. CONSTITUTION:Heater circuit wires 15 and a safety circuit wire 16, etc., are built in a multicore cord 14, and the cross-sectional area of the safety circuit wire 16 is designed to be smaller than the cross-sectional area of each heater circuit wire 15, because low current flows therein upon abnormal heating of a heater wire 11 provided in a main body 10. And, by increasing the number of strands while decreasing the strand diameter of the safety circuit wire 16 as small as possible, the strength of the safety circuit wire 16 relating to its bending strength is to be stronger than the strength of the heater circuit 15. Consequently, until the heater circuit 15 is broken, a safety circuit provided in a controller part 13 operates to prevent abnormal heating of the heater wire 11.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to electric heating devices such as electric blankets and electric carpets.

BACKGROUND OF THE INVENTION Conventional electric heating devices of this type have structures as shown in FIGS. 5 and 6.

That is, the heater wire 2 is disposed in the main body 1, and the heater wire 2
is electrically connected to a connector section 3 provided at one corner of the main body 1. The connector part 3 of the main body 1 is detachable, and when not used as an electric carpet, the connector part 3 can be removed and used as a general carpet notebook. Reference numeral 4 denotes a controller section that performs temperature control, safety control, etc. of the heater wire 2 disposed in the main body 1, and the controller section 4 and the connector section 3 are electrically connected by a multicore cord 5. The multicore cord 5 includes a heater circuit wire 6, a safety circuit wire 7, and the like. The cross-sectional area of the safety circuit wire 7 is larger than the cross-sectional area of the heater circuit wire 6, through which a high current flows when normally energized, because a low current flows only when the heater wire 2 disposed in the main body 1 generates abnormal heat. is also smaller.

(For example, for a cross-sectional area of 0.5 mm2 of the safety circuit wire 7,
(The cross-sectional area of the heater circuit wire 6 is 1.25 mm.) The wire diameter of each heater circuit and safety circuit wire is φ0.
12, and the cross-sectional area is determined by the number of strands. The number of strands of the safety circuit wire 7 is smaller than the number of strands of the heater circuit wire 6 due to the above-mentioned reason. That is, from the bending durability strength of the heater circuit wire 6, the safety circuit wire 7
The wire structure had a weak bending durability.

Problem to be Solved by the Invention However, in the above configuration, in the multicore cord 5 that electrically connects the cocker part 3 and the controller part 4, the bending durability strength of the safety circuit wire 7 is higher than that of the heater circuit wire. Since the safety circuit vA7 is weaker than the bending durability strength of the heater circuit wire 6, the safety circuit vA7 will break before the heater circuit wire 6 due to external stresses such as stepping on, pulling, and bending being applied over time. At this time, the safety circuit (not shown) provided in the controller section 4 does not operate when the heater wire 2 generates abnormal heat.
The problem was that the situation was extremely dangerous.

The present invention solves such conventional problems and aims to provide a safer electric heating device.

Summary of Means to Solve the ProblemsTo solve the problems, the electric heating device of the present invention includes a main body in which a heater wire is arranged, a detachable connector part provided on the main body, and a temperature control of the main body. Con)・
The multi-core cord includes a roller section and a multi-core coat that electrically connects the connector section and the controller section, and the multi-core cord is made up of a heater circuit wire and a safety circuit wire, and the bending durability strength of the safety circuit wire is increased. The bending durability strength of the heater circuit wire is made stronger than that of the heater circuit wire.

Effect: With the above-described configuration, the present invention makes the bending durability strength of the safety circuit wire stronger than the bending durability strength of the heater circuit wire in a multicore cord that electrically connects the connector part and the controller part. Therefore, the safety circuit provided in the controller section does not operate until the heater circuit wire is disconnected, and abnormal heat generation of the heater wire can be prevented.

EXAMPLE Hereinafter, an example of the present invention will be described based on the accompanying drawings. 1, 21211↓ Here, 10 is a main body, and a heater wire 11 is disposed in this main body 10.

The heater wire 11 is electrically connected to a connector section 12 provided at two corners of the main body 10. and main body 10
The connector part 12 is detachable, and when not used as an electric carpet, the connector part 12 can be removed and used as a general carpet notebook. 13 is a heater wire 11 disposed in the main body 10
The controller section 13 and the connector section 12 are electrically connected by a multicore cord 14. The multicore cord 14 includes a heater circuit wire 15, a safety circuit wire 16, and the like. The cross-sectional area of the safety circuit wire 16 is smaller than the cross-sectional area of the heater circuit wire 15, through which a high current flows during normal energization, because a low current flows when the heater wire 11 disposed in the main body 10 generates abnormal heat. For example, while the cross-sectional area of the safety circuit wire 16 is 0.5 mm, the cross-sectional area of the heater circuit wire 15 is 1.5 mm.
In order to make the strength of the safety circuit wire 16 stronger than the heater circuit wire 15 with respect to the bending strength, the wire configuration of each circuit wire is changed, for example, to make the safety circuit wire 16 φ.
0.08x 100 cores, and the heater circuit wire 15 is φ0.
It has 12X 112 cores. The trampling and tensile strength are influenced by the thickness, hardness, etc. of the sheath 14' of the multicore cord 14, but the bending strength is often influenced by the strand configuration.

As described above, by making the wire diameter of the safety circuit wire 16 as thin as possible and increasing the number of wires, the strength of the safety circuit wire 16 with respect to bending strength can be made stronger than the strength of the heater circuit wire 15. I have to.

Next, the operation of the safety circuit will be briefly explained based on FIGS. 3 and 4V.

17 is a core thread around which a safety wire 18 is wound.

Reference numeral 19 denotes a heater wire, which is insulated from the safety wire 18 via the temperature-sensitive layer 20. The heater wire 19 is covered with a jacket 21 to constitute the heater wire 11.

If the heater wire 11 were to locally generate abnormal heat for some reason, the temperature sensitive layer 20 would melt, causing the safety wire 18 and the heater wire 1 to melt.
9 is shorted.

When a short circuit occurs between the safety wire 18a of the heater wire 11 disposed in the main body 10 and the heater base 119a, the current flows through the resistor 21. Passing through the diode 22, the safety circuit wire 164 of the multi-conductor cord 14, the safety wire 18a, and the connector portion 12.
The flow flows to the heater wire 19a, the resistor 21 generates heat, the temperature fuse 23 in the controller section 13 is blown, and the heater 1
11 is cut off.

In addition, a safety line 18 of the heater wire 11 disposed in the main body 10
When the current between b and the heater wire 19b is solitary, the current is
During the positive half cycle, the resistor 24. provided within the controller section 13. The safety circuit wire 16 of the multicore cord 14 passes through the diode 25. Through the connector part 12, the safety wire 18b,
The heat flows to the heater wire 19b, the resistor 24 generates heat, the temperature fuse 23 in the controller section 13 blows out, and the electricity to the heater wire 11 is cut off.

Effects of the Invention As described above, according to the electric heating device of the present invention, the bending durability of the safety circuit wire built into the multicore cord that electrically connects the connector part and the controller part can be improved by the bending durability of the heater circuit wire. Since it is constructed to be stronger than its physical strength, the safety circuit provided in the controller section is activated until the heater circuit wire is disconnected, and abnormal heat generation of the heater wire can be prevented. Therefore, it is possible to provide an electric heating device with higher safety.

[Brief explanation of the drawing]

Figure 1 is a perspective view of an electric heating device according to an embodiment of the present invention. Figure 2 is an enlarged sectional view taken along A-A of the multicore cord in Figure 1. Figure 3: The same heater wire. Configuration V, Figure 4 is the same safety circuit diagram, Figure 5 is a perspective view of the conventional electric heating device, and Figure 6 is the same safety circuit diagram.
5 is an enlarged sectional view taken along the line BB of the multicore cord in FIG. 5. FIG. 10... Main body, 11... Heater wire, 12
...Connector part, 13...Controller part, 14...Multi-conductor cord, 15...
・Heater circuit wire, 16...Safety circuit wire. Name of agent: Patent attorney Akira Kokaji and two others IO - Main body 11 - Heater wire 12 - Connector part 13 - m - Cositrol roller part 14 - m - Multi-core needle No. 1 Figure 14 - Multi-bar code No. 2 Figure 15- 11 Hee, 9 circuits” Song f6-Safety circuit line G Part 3 Figure 11--Hee! 9 katsu l2- Controller part t4-- 9 core two upper part l5-- Heater circuit tlB-11> assembly Bi-ro-jj K4 figure JI5 reason number Figure 6/

Claims (1)

[Claims] A main body in which a heater wire is arranged, a detachable connector part provided on the main body, a controller part that controls the temperature of the main body, and a multicore cord that electrically connects the connector part and the controller part. The multi-core cord is composed of a heater circuit wire and a safety circuit wire, and the safety circuit wire has a stronger durability when bent than the heater circuit wire. Ingredients.