JPH0448575A - Heating element and electric heating tool using it - Google Patents

Abstract

PURPOSE:To switch the heat quantity with one cord-shaped heating element and manufacture it with an existing production facility by combining the first heating raw wire and the second heating raw wire into one bundle, winding the third conductor on the outer periphery, and providing an outer layer on the outside. CONSTITUTION:The first heating raw wire 4 is constituted of the first heat sensitive layer 3 provided on the outside of the first conductor 2 spirally wound on the outer periphery of the first core material 1, and the second heating raw wire 8 is constituted of the second heat sensitive layer 7 provided on the outside of the second conductor 6 wound on the second core material 5 like the above heating raw wire 4. An outer film layer 10 made of an insulating material is provided on the outside of the third conductor 9 spirally wound on the outer periphery of the bundle of the first heating raw wire 4 and the second heating raw wire 8. A heating element 31 can be manufactured from the first heating raw wire 4 and the second heating raw wire 8 by using the nipples and dies of the conventional production facility of this kind of heating wires.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a cord-shaped heating element used in electric heating appliances, and is particularly applicable to sheet electric heating appliances such as electric carpets and electric blankets. This invention relates to a heating element and an electric heating device using the heating element.

(Prior art) Heating elements used in conventional electric heating appliances can be broadly divided into sheath heaters, surface heaters, cord heaters, lamp heaters, semiconductor heaters, etc. Examples of cord heaters that have been developed include a cord-shaped heating element proposed in Japanese Utility Model Application Publication No. 58-65793;
A heat-sensitive layer 23 made of synthetic resin or the like is provided on the outer periphery of two wires with a primary conductor 22 wound around them, and a heat-sensitive layer 23 made of synthetic resin or the like is provided on the outer periphery of the wires, and a secondary conductor 24 is placed on the outside thereof.
is wound, and an insulating outer cover 25 is provided on the outside.

According to the cord-shaped heating element of this invention, by providing heating wires of two or more conductors in parallel while maintaining a certain distance, the power consumption of the electric heating device can be changed with -1 cord-shaped heating element. It has the characteristic of being able to

However, in the cord-shaped heating element invented above,
New dies and nipples for extruding the heat-sensitive layer 23 and dies and nipples for extruding the insulating sheath 25 are required in the existing production equipment, and the primary conductor 2 of the heating wire is required in advance.
2 cannot be prepared because the exposed primary conductor 22 will rust, it is not possible to produce combinations of several types of heating wires in a timely manner, and the secondary conductor 2 of the signal wire
Problems arise, such as the formation of parts where the distance between the heating wire 4 and the primary conductor 22 of the two heating wires is not kept constant.

On the other hand, in the wiring of conventional heating devices such as electric carpets, heating elements are arranged in a loop according to the method disclosed in the invention of JP-A No. 63-257196.
There is a problem in that noise is generated due to contact arcs when the relay is turned on and off.

[Problem to be solved by the invention]

The present invention has been made to solve the above-mentioned conventional problems, and has the following features: - It is possible to switch the amount of heat generated by a cord-shaped heating element, and it can be easily manufactured using existing production equipment. Furthermore, we developed a heating element and an electric heating device using it that can exhibit the same performance as conventional cord-shaped heating elements and can prevent the noise that was generated in the wiring when manufacturing electric carpets. This is what we have set as an issue.

[Means to solve the problem]

As a means for solving the above problems, the heating element of the present invention includes a first temperature-sensitive layer provided on the outside of a first conductor wound spirally around the outer periphery of a first core material. A second heat generating element consisting of a first heat generating element wire, a second conductor spirally wound around the outer periphery of a second core material, and a second temperature sensitive layer provided outside the second conductor. A third conductor is wound spirally around the outer periphery of the wires,
It is constructed by providing an outer skin layer of an insulating material on the outside thereof.

On the other hand, in the electric heating device using the above heating element, there are cases where only the first conductor generates heat, cases where the first conductor and second conductor simultaneously generate heat, and cases where only the second conductor generates heat. By selecting either of the cases, the amount of heat generated from the heating element can be switched using a single cord-shaped heating element, and one end of the heating element mentioned above can be connected to the first conductor. By short-circuiting the second conductor and supplying current from the other terminal end, the occurrence of noise can be prevented by canceling out circuit noise as considered from general electrical theory.

〔Example〕

The present invention will be described in detail below with reference to the drawings. Fig. 1 is a side view showing a broken end of a heating element in an embodiment of the invention, and Fig. 2 is a front sectional view of Fig. 1. It is.

First, in this embodiment, a first core material l, a first conductor 2 wound spirally around the outer periphery of the core material l, and a first conductor provided outside the first conductor 2 are used. There is a first heating element wire 4 composed of a warm layer 3, and a second core material 5 formed in the same manner as the first heating element wire 4, and a second conductor 6.
and a second heat-sensitive layer 7.
There is.

The first heat generating wire 4 and the second heat generating wire 8 are bundled together, and a third conductor 9 is formed by winding the bundle in a spiral around the outer periphery of the bundle. An outer skin of insulating material is provided on the outside of the insulating material.

In the heating element 31 described above, the first calorific value 1a4 and the second heating element wire 8 can be manufactured using the nipples and dies of conventional production equipment for this kind of heating wire, and the first heating element 31 of each heating wire The intervals between the conductor 2, the second conductor 6, and the third conductor 9, which is a heat-sensitive wire, are formed to be constant.

Note that the third conductor 9 is wound around the outer periphery of the first temperature-sensitive layer 3 and the second temperature-sensitive layer 7, and
The impedance of the conductor 2.6 is detected and the current flowing through each conductor 2.6 is controlled to prevent disasters caused by abnormal overheating.

Furthermore, as shown in FIG. 3, the third conductor 9 is connected to the temperature sensitive layers 3 and 7
This is a heating element 31 of another embodiment that is wound to match the outer circumferential shape of.

Next, FIG. 4 shows a control circuit diagram of an embodiment of a heating device using a heating element having the above-mentioned configuration.

That is, the first conductor 2 and the second conductor in the heating element wire 4 of
According to instructions from the control circuit 11, the relay coils 12 and 13 are operated to open and close the relay contacts 14 and 15 for the second conductor 6 in the heating element wire 8.

For example, at the beginning of energization, relay contacts 14 and 15 are turned on to increase the temperature rise, and when the temperature becomes stable, relay contact 1
By switching to only 4 to reduce heat generation,
The load capacity is reduced compared to indoor wiring, and other electrical products can also be used.

Also, when the room temperature is relatively high, only the relay contact 15 should be turned off.
By setting it to N, the load capacity can be further reduced.

Next, FIG. 5 shows another embodiment of a heating device using the heating element 31 described above. In this case, one end of the cord-shaped heating element 31 used in the electric heating device 30 The first conductor 2 and the second conductor 6 are short-circuited as shown by the arrow S, and current is supplied from the other terminal end.
Noise generation from 1 is prevented.

〔Effect of the invention〕

According to the heating element of the present invention and the electric heating device using the heating element as described above, the heating element is capable of switching the amount of heat generated using the structure of the cord-shaped heater, and the existing production equipment is utilized as much as possible. This has the effect of providing a heating element and an electric heating device that can be produced at low cost.

Further, a first conductor and a second conductor constituting the heating element,
The distance between the first conductor and the third conductor becomes uniform, and in the event of an abnormality such as when the heating element wire is half-broken due to an external force and sparks, the distance between the first conductor and the third conductor and between the second conductor and the third conductor becomes uniform. The short-circuit performance becomes uniform, and the performance can be equivalent to that of conventional heating elements.

Furthermore, if the first conductor and second conductor at one end of the heating element are short-circuited in the wiring box of the electric carpet, etc., and the current is supplied from the other end, the electric heating device can be used. This has the effect of preventing noise generated from the built-in heating element.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a broken end of one embodiment of the heating element of the present invention, FIG. 2 is a front sectional view of FIG. 1, and FIG. 3 is another embodiment of the heating element of the present invention. FIG. 4 is a control circuit diagram of one embodiment of the electric heating device using the heating element of the present invention, and FIG. 5 is a side view showing a broken end portion of the device. FIG. 6 is a perspective view showing a conventional heating element with its end cut away. DESCRIPTION OF SYMBOLS 1... 1st core material, 2... 1st conductor, 3... 1st temperature-sensitive layer, 4... 1st heat generating wire, 5... 2nd core material , 6... second conductor, 7... second temperature sensitive layer, 8
...Second heating element wire, 9...Third conductor, 1o...
- Outer skin layer, 30... Electric heating device, 31... Heating element,
N...Short circuit.

Claims (1)

[Claims] 1. A first core wound spirally around the outer periphery of the first core.
A first heating element wire consisting of a conductor and a first temperature-sensitive layer provided outside the first conductor, a second conductor wound spirally around the outer periphery of a second core material, and the second conductor. A second heat-generating wire consisting of a second temperature-sensitive layer provided on the outside of the second conductor is made into a bundle, and a third conductor is spirally wound around the outer periphery of the bundle. A heating element with an outer skin layer. 2. You can choose between generating heat only in the first conductor, generating heat in the first conductor and second conductor simultaneously, or generating heat only in the second conductor. An electric heating device using the heating element according to claim 1. 3. An electric heating device using the heating element according to claim 1, wherein the first conductor and the second conductor are short-circuited at one end of the heating element, and a current is supplied from the other end.