JP3312331B2 - Heater wire - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a heater wire,
More specifically, the present invention relates to a heater wire that can sufficiently reduce a leakage magnetic field and can reliably short-circuit a heating element wire and a signal line when abnormal heat is generated. In particular, it is useful for laying on a planar heating device such as an electric blanket or an electric carpet.

[0002]

2. Description of the Related Art FIG. 7 is a structural view showing an example of a conventional heater wire. In the heater wire 600, a heating element wire 62 is spirally wound around an outer periphery of a core 61, a polyamide resin-made fusion layer 63 is provided around the outer periphery thereof, and a signal line 64 is spirally wound around the outer periphery thereof. Outermost layer 6
5 is provided. When the temperature of the heating element wire 62 rises abnormally, the melting fault 63 is melted by heat, and the heating element wire 62 and the signal line 64 are short-circuited, and the energization is stopped by a safety device (not shown). .

FIG. 8 is a structural view showing a heater wire disclosed in Japanese Patent Application Laid-Open No. 4-278125. The heater wire 700 is formed by winding a first heating element wire 72 around a winding core 71 in a spiral shape, and forming a heat-resistant insulator 7 made of polyimide on the outer periphery thereof.
3, a second heating element wire 74 is spirally wound around its outer periphery, a nylon melting layer 75 is provided around its outer periphery, and a signal line 76 is spirally wound around its outer periphery.
This is a structure in which an outermost layer 77 is provided on the outer periphery. By supplying currents in opposite directions to the first heating element wire 72 and the second heating element wire 74, the generated magnetic fields can be canceled each other, and the leakage magnetic field can be reduced. FIG. 9 is a structural view showing a heater wire disclosed in Japanese Patent Application Laid-Open No. 4-305716. In the heater wire 800, a first heating element wire 82 is spirally wound around an outer periphery of a core 81, and a first temperature-sensitive resin layer 83 that melts at a predetermined temperature is provided on the outer periphery thereof. Wind the wire 84 in a spiral shape,
A second heat-sensitive resin layer 85 is provided on the outer circumference, a second heating element wire 86 is spirally wound on the outer circumference, and an outermost layer 87 is provided on the outer circumference. If the temperatures of the first heating element wires 82 and the second heating element wires 86 rise abnormally, the temperature-sensitive resin layers 83 and 85 are melted by heat, and the heating element wires 82 and 86 and the signal line 84 are melted. Are short-circuited, and the energization is stopped by a safety device (not shown).

[0004]

The above conventional heater wire 6
In the case of 00, a magnetic field which spreads radially is generated by the current flowing through the heating element wire 62, and there is a problem that the magnetic field leaks outside. In other words, when the energizing current is an alternating current having a high frequency, high-frequency magnetic noise is generated, which may adversely affect other electric devices. In addition, when the current is low alternating current or direct current, a leakage magnetic field corresponding to the current is generated.However, from the viewpoint of preventing effects on a living body such as a human body, the intensity of the leakage magnetic field is reduced as much as possible. It is preferable (especially, when laying a wire on a planar heating device, the distance between the heater wire and the human body is short, so a reduction in the leakage magnetic field is required).

In the above-described conventional heater wire 700, the heat generated in the first heating wire 72 is transmitted to the melting layer 75 via the heat-resistant insulator 73. Generally, the organic material has relatively high heat insulation. Therefore, even if the temperature of the first heating element wire 72 rises abnormally, it is difficult to reliably melt the molten layer 75 in a short time, and there is a problem that the sensitivity for stopping the current supply is reduced.

Further, in the conventional heater wire 800,
At the time of abnormal heat generation, both the first temperature-sensitive resin layer 83 and the second temperature-sensitive resin layer 85 are melted at the same time, and the first heating element wires 82 and
It is easy to short-circuit with the second heating element wire 86 while it is in an energized state,
There is an unfavorable problem from the viewpoint of safety.

Accordingly, a first object of the present invention is to provide a heater wire capable of sufficiently reducing a leakage magnetic field and reliably short-circuiting a heating element wire and a signal wire when abnormal heat is generated.
A second object of the present invention is to provide a first heating element wire and a second heating element wire.
It is an object of the present invention to provide a heater wire capable of preventing a short circuit with the heating element wire while the current is being supplied.

[0008]

According to a first aspect of the present invention, a first heating element wire (2) is spirally wound around an outer periphery of a core (1), and a first molten wire is wound around the outer periphery thereof. A fault (3) is provided, a second heating element wire (4) is spirally wound around the outer circumference, a second fusion fault (5) is provided on the outer circumference, and a signal line (6) is wound on the outer circumference. A heater wire having an outermost layer (7) provided on the outer periphery thereof ,
The melting point of the material of the fusion fault (3) is
A heater wire (100) characterized by having a higher melting point than the material of (5) . In the heater wire (100) according to the first aspect, by causing currents to flow in opposite directions through the first heating element wire (2) and the second heating element wire (4), the generated magnetic fields are mutually separated. The cancellation and the leakage magnetic field can be reduced. Further, since the first heating element wire (2) and the second heating element wire (4) are wound with only one layer of the first molten layer (3) separated, the winding diameter of both the heating elements Can be reduced. Therefore, the heater wire (100)
, The intensity difference between the magnetic field generated by the first heating element wire (2) and the magnetic field generated by the second heating element wire (4) is reduced, and the magnetic field is almost completely canceled. This is also advantageous in reducing the leakage magnetic field. Further, a first molten layer (3) is provided between the first heating element wire (2) and the second heating element wire (4). Since the first heating element (2) is made of a material having a melting point that can be melted, it can be easily melted if the temperature of the first heating element (2) rises abnormally. In addition, a second molten layer (5) is provided between the second heating element wire (4) and the signal line (6), and the second molten layer (5) also has a melting point that melts during abnormal heating. Since it is made of a material, if the first molten layer (3) is molten, it is easily melted by its heat. Therefore, when the first heating element (2) generates abnormal heat,
Melts (3) and the second melt (5) melt, and the first heating element wire (2) and the signal wire (6) are short-circuited. Further, when the second heating element wire (4) generates abnormal heat, the second melting layer (5) melts, and the second heating element wire (4) and the signal line (6) are short-circuited. As a result, the first heating element wire (2)
For any abnormal heat generation of the second heating element wire (4), the sensitivity for stopping energization can be increased, and overheating of the heater wire (100) can be reliably prevented. I can do it.

Further, in the heater wire ( 100 ) according to the first aspect, a first molten layer provided between the first heating element wire (2) and the second heating element wire (4). Since the melting point of the material of ( 3 ) is higher than the melting point of the material of the fusion layer ( 5 ) provided between the second heating element wire (4) and the signal line (6), the first heating element Wire (2) and second heating element wire (4)
If the temperature rises abnormally, the first fusion fault ( 3 )
Prior to this, the second melting layer ( 5 ) is melted by heat, and the second heating element wire (4) and the signal line (6) are short-circuited. Therefore, it is possible to prevent the first heating fault ( 3 ) from melting first and short-circuiting the first heating element wire (2) and the second heating element wire (4) in the energized state, thereby improving safety. It can be further improved.

[0010] In a second aspect, the present invention provides a method in which a signal line (6) is spirally wound around the outer periphery of a winding core (1), a first molten layer ( 43 ) is provided around the outer periphery thereof, and The first heating element wire (2) is spirally wound, a second fusion fault ( 45 ) is provided on the outer periphery thereof, and the second heating element wire (4) is spirally wound on the outer periphery thereof. A heater wire having an outermost layer (7) provided on an outer periphery thereof, wherein the heater wire comprises:
The melting point of the material of (43) is the same as that of the second molten fault (45).
The heater wire ( 40), which is lower than the melting point of the material.
0 ). The heater wire according to the second aspect ( 40
0 ), the signal line (6) is wound around the core (1), that is, the center axis side, so that the heat transmitted to the first fusion fault ( 43 ) provided on the outer periphery of the signal line (6) is externally transmitted. The short circuit at the time of abnormal heat generation can be performed more reliably. Therefore, safety can be improved.

Further, in the heater wire (400) according to the second aspect , the signal line (6) and the first heating element wire (2)
The melting point of the material of the first fusion layer (43) provided between the first heating wire (43) and the second heating wire (4) provided between the first heating wire (2) and the second heating wire (4). Since the temperature of the first heating element wire (2) and the temperature of the second heating element wire (4) are abnormally high because the melting point is lower than the melting point of the material of the melting layer (45), the second melting layer ( Prior to 45), the first molten layer (43) is melted by heat, and the signal line (6) and the first heating element wire (2) are short-circuited. Accordingly, it is possible to prevent the second heating layer (45) from melting first and short-circuiting the first heating element wire (2) and the second heating element wire (4) while the current is being supplied, thereby improving safety. It can be further improved.

According to a third aspect of the present invention, a first heating element wire (2) is spirally wound around the outer periphery of a core (1), and a first molten layer (53) is provided on the outer periphery. A signal line (6) is spirally wound around the outer periphery, and a second molten layer (55) made of a material having a melting point different from the melting point of the material of the first molten layer is provided on the outer periphery. , A second heating element wire (4) is spirally wound around the outer periphery thereof,
There is provided a heater wire (500) characterized in that an outermost layer (7) is provided on the outer periphery thereof. In the heater wire (500) according to the third aspect , since the melting point of the material of the first molten layer (53) is different from the melting point of the material of the second molten layer (55), the first heating element wire is formed. (2) and a second heating element wire (4)
If the temperature rises abnormally, the molten layer made of a material having a low melting point melts first due to heat, and either one of the heating element wires and the signal line (6) are short-circuited, and the energization is stopped. Is done. Therefore, both the first fusion layer (53) and the second fusion layer (55) are melted at the same time, and the first heating element wire (2) and the second heating element wire (4) are in an energized state. It is possible to prevent a short circuit from occurring and to further improve safety. Also,
The first heating wire (2) and the second heating wire (4) are 2
Since the layers are separated from each other, it is difficult for the two to be short-circuited. In this respect, safety can be improved.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to the embodiments shown in the drawings. Note that the present invention is not limited by this.

First Embodiment FIG. 1 is a structural diagram showing a heater wire according to a first embodiment of the present invention. In the heater wire 100, a first heating element wire 2 is spirally wound around an outer periphery of a core 1 at a constant pitch, a first fusion layer 3 is provided on the outer periphery, and a second fusion layer 3 is provided on the outer periphery.
The heating element wire 4 is spirally wound at a constant pitch, a second fusion layer 5 is provided on the outer periphery thereof, the signal line 6 is spirally wound at a constant pitch on the outer periphery thereof, and the outermost layer 7 is formed on the outer periphery thereof. It is a structure provided. The core 1 is made of, for example, wholly aromatic polyester or wholly aromatic polyamide fiber. The first heating wire 2 and the second heating wire 4
Is, for example, a copper flat rectangular wire of 0.06 × 0.34 mm. It said first fusible layer 3 and the second fusible layer 5 Nitsu
Will be described later . The signal line 6 is, for example, 0.06 ×
It is a flat copper wire of 0.34 mm. Note that a copper alloy flat wire may be used instead of the copper flat wire.

The outermost layer 7 is an insulating jacket, for example, polyvinyl chloride (PVC; Polyvinyl Chloride).
) It is made of resin. In this case, a plasticizer of polyvinyl chloride is provided between the signal line 6 and the outermost layer 7.
May be wrapped around a polyester tape which prevents the transfer to the side of the polyester tape.

FIG. 2 is an explanatory diagram showing a leakage magnetic field measuring system for measuring a leakage magnetic field from the heater wire 100 of FIG. The leakage magnetic field measurement system A includes a heater wire 1
00 and one end of the second heating element 4
Is connected to an AC power supply S, the other end of the first heating element wire 2 and the other end of the second heating element wire 4 are short-circuited, and the detecting section P of the magnetic field measuring instrument D is connected to the heater wire 100. By attaching
This is a configuration for measuring a leakage magnetic field. As indicated by the arrows, an alternating current i flows through the heater wire 100.

FIG. 3 is a table showing the results of measuring the leakage magnetic field with respect to the power consumption by the leakage magnetic field measurement system A of FIG. The comparative example is a measurement result of the conventional heater wire 500 (see FIG. 7 ). Note that the frequency of the AC power supply S is 60 Hz. Further, as the magnetometer D,
Measurement standard MPR-II for VDU (Visual Display Unit)
Measuring instrument (combinanova, model name MF)
M10, manufactured by Toyo Technica Co., Ltd.). FIG.
Is a graph showing characteristics of a leakage magnetic field with respect to power consumption. In the graph, the measurement points on the heater line 100 are indicated by black circles, and the characteristics of the leakage magnetic field are indicated by solid lines. Also,
The measurement points according to the comparative example are indicated by white circles, and the characteristics of the leakage magnetic field are indicated by dotted lines. 3 and 4, the intensity of the leakage magnetic field according to the heater wire 100 and the comparative example changes depending on the power consumption. However, the intensity of the leakage magnetic field applied to the heater wire 100 is about 1/100 of the comparative example. It turns out that it is much smaller.

In the above-described heater wire 100, by causing currents to flow in opposite directions through the first heating element wire 2 and the second heating element wire 4, the generated magnetic fields cancel each other, thereby reducing the leakage magnetic field. You can do it. Also, the first heating element wire 2
A first molten layer 3 that melts due to abnormal heat generation is provided between the second heating element 4 and the second heating element 4, and a second molten layer 5 is provided between the second heating element 4 and the signal line 6. If the first heating element wire 2 generates abnormal heat, the first and second molten layers 3 and 5 can be melted to ensure a short circuit with the signal line 6. .

Next, the first fusion layer 3 and the second fusion
The fault 5 will be described. In the heater wire 100 , the melting point of the material of the first fusion layer 3 provided between the first heating element wire 2 and the second heating element wire 4 is equal to the melting point of the second heating element wire 4 and the signal line. 6 is higher than the melting point of the material of the second fusion layer 5 provided between the second fusion layer 5 and the second fusion layer 5 . The first fusion layer 3 is made of, for example, polyethylene terephthalate (PE) having a melting point of about 250 ° C.
T; PolyEthylene Terephthalate) resin. If a trade name is shown, perprene (manufactured by Toyobo Co., Ltd.) is preferable. Instead of the polyethylene terephthalate resin, a fluorine resin such as polytetrafluoroethylene (PTFE) having a melting point of about 300 ° C. may be used. Teflon (manufactured by Mitsui Fluorochemicals Co., Ltd.) is suitable if a trade name is given. The second welding layer 5 is made of, for example, nylon 11 having a melting point of about 180 ° C.

According to the first embodiment described above, the first source
The temperature of the heating wire 2 and the second heating wire 4 rises abnormally.
In this case, the second fusion fault 5 is provided before the first fusion fault 3.
Is melted by heat , and the second heating element wire 4 and the signal line 6 are short-circuited.
Then, the energization is stopped. Therefore, the first fusion fault 3
The first heating element wire 2 and the second heating element wire 4
To prevent a short circuit while the power is on, further improving safety.
I can do it.

Second Embodiment FIG. 5 is a structural diagram showing a heater wire according to a second embodiment of the present invention. In the heater wire 400, the melting point of the material of the first fusion layer 43 provided between the signal line 6 and the first heating element wire 2 is the first heating element wire 2 and the second heating element wire. 4 is lower than the melting point of the material of the second fusible layer 45 provided between the first and second layers. The first welding layer 43 is made of, for example, nylon 11 having a melting point of about 180 ° C. The second welding layer 45 is made of, for example, polyethylene terephthalate resin having a melting point of about 250 ° C. Note that a fluororesin such as a polytetrafluoroethylene resin having a melting point of about 300 ° C. may be used instead of the polyethylene terephthalate resin. According to the above-described second embodiment, when the temperatures of the first heating element wire 2 and the second heating element wire 4 are abnormally increased, the first heating element wire 2 and the first heating element wire 4 are moved to the first heating element 45 first. The melting fault 43 is melted by heat, and the signal line 6 and the first heating element wire 2 are short-circuited. Therefore, it is possible to prevent the first heat generating element wire 2 and the second heat generating element wire 4 from being short-circuited while the second heat generating layer 45 is melted first and the first heat generating element wire 2 and the second heat generating element wire 4 are energized, thereby further improving safety.

Third Embodiment FIG. 6 is a structural diagram showing a heater wire according to a third embodiment of the present invention. In the heater wire 500, the first heating element wire 2 is spirally wound around the outer periphery of the winding core 1 at a constant pitch, a first fusion layer 53 is provided on the outer periphery thereof, and the signal line 6 is fixed on the outer periphery thereof at a constant pitch. And a second heating layer 55 made of a material having a melting point different from the melting point of the material of the first melting layer 53 is provided on the outer periphery thereof, and the second heating element wire is provided on the outer periphery thereof. 4 is spirally wound at a constant pitch, and the outermost layer 7 is provided on the outer periphery. The melting point of the material of the first molten layer 53 and the melting point of the second molten layer 5
The material 5 may have any melting point. In the case where the melting point of the latter is higher than the melting point of the former, for example, the first melting layer 53 is made of nylon 11 having a melting point of about 180 ° C.
It is made. Further, the second fusion layer 55 is made of, for example, polyethylene terephthalate resin having a melting point of about 250 ° C. Note that a fluororesin such as a polytetrafluoroethylene resin having a melting point of about 300 ° C. may be used instead of the polyethylene terephthalate resin. In the case where the melting point of the latter is lower than that of the former, the material of the first molten layer 53 and the material of the second molten layer 55 may be reversed. According to the above third embodiment,
When the temperatures of the first heating element wire 2 and the second heating element wire 4 rise abnormally, the molten layer made of a material having a low melting point is melted first by heat, and either one of the heating elements is heated. The element wire and the signal line 6 are short-circuited, and the energization is stopped. Accordingly, it is possible to prevent both the first and second heating layers 53 and 55 from melting at the same time and short-circuiting the first heating element wire 2 and the second heating element wire 4 while the current is being supplied. Performance can be further improved. Further, the first heating element wire 2 and the second heating element wire 4
Are separated by two layers, it is difficult for both to be short-circuited, and in this respect, safety can be improved.

[0023]

According to the heater wire of the present invention, the first heating element wire, the second heating element wire, and the signal line (the relationship between the inner and outer circumferences thereof) are spirally wound in the line axis direction. Both layers are fusion faults made of a material that melts at the time of abnormal heat generation, so that the leakage magnetic field is reduced by canceling out the magnetic fields generated by the two heating wires, and the sensitivity for stopping energization is reduced. Can be improved. Also, by giving a difference in melting point to the melting fault, when two heating wires generate abnormal heat, only one melting fault is selectively melted and the other melting fault is left as an insulator. Therefore, a short circuit between the heating element wires can be prevented.

[Brief description of the drawings]

FIG. 1 is a structural diagram showing a heater wire according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a leakage magnetic field measurement system for measuring a leakage magnetic field of a heater wire of FIG. 1;

FIG. 3 is a table showing measurement results of a stray magnetic field by the stray magnetic field measurement system of FIG. 2;

FIG. 4 is a graph showing characteristics of a leakage magnetic field with respect to power consumption.

FIG. 5 is a structural diagram showing a heater wire according to a second embodiment of the present invention.

FIG. 6 is a structural diagram showing a heater wire according to a third embodiment of the present invention.

FIG. 7 is a structural diagram showing an example of a conventional heater wire.

FIG. 8 is a structural diagram showing another example of a conventional heater wire.
You.

FIG. 9 is a structural view showing still another example of a conventional heater wire.
It is.

[Explanation of symbols]

100 , 400, 500 Heater wire 1 Core 2 First heating element wire 3, 4, 3, 53 First welding fault 4 Second heating element wire 5, 4, 5, 55 Second welding fault 6 Signal wire 7 Outermost layer A Leakage magnetic field measurement system D Magnetic field measurement device P Detector S AC power supply i AC current

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-4-278125 (JP, A) JP-A-3-252080 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H05B 3/00 F24D 13/02 H05B 3/56 H05B 3/10

Claims (3)

(57) [Claims] A first heating element wire (2) is spirally wound around an outer periphery of a winding core (1), a first fusion layer (3) is provided on the outer periphery thereof, and a second heat generating layer is provided on the outer periphery thereof. The element wire (4) is spirally wound, a second molten layer (5) is provided on the outer periphery thereof, the signal line (6) is spirally wound on the outer periphery thereof, and the outermost layer (7) is provided on the outer periphery thereof. Heater wire provided
Wherein the melting point of the material of the first fusion fault (3) is
The heater wire (100), wherein the heater wire (100) has a higher melting point than the material of the second fusion fault (5 ). 2. A signal line (6) is provided around an outer periphery of a core (1) by a spa
It is wound in an spiral shape and the first fusion fault (43)
And the first heating element wire (2) is spirally wound around its periphery.
And a second fusion fault (45) is set around the outer periphery.
And a second heating element wire (4) spirally
It is wound with a heater wire having an outermost layer (7) provided on the outer periphery.
The melting point of the material of the first fusion fault (43) is
The heater wire (400), which is lower than the melting point of the material of the second fusion layer (45 ). 3. A first heating element wire around an outer periphery of a winding core (1).
(2) is wound in a spiral shape, and the first wire is
A fault (53) is provided, and a signal line (6) is spied around the fault.
And wound around the outer periphery thereof, and the material of the first fusion fault
A second material made of a material having a melting point different from the melting point of
A second heat generating wire is provided on the outer periphery of the fusion fault (55).
(4) spirally wound around the outermost layer
(7) The heater wire (500), wherein the heater wire (500) is provided .