JPS58152393A - Self-temperature controlled heater cord - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention The present invention relates to a heater cord having a self-temperature control function, and relates to a structure in which the organic positive temperature coefficient thermistor cord used is partially made into a non-heating element, eliminating the need for external lead wires. It is.

A conventional self-temperature control heater cord using an organic positive temperature coefficient thermistor cord will be explained with reference to FIGS. 1 to 3.

Figure 1 shows the structure of an organic positive temperature coefficient thermistor cord 1, in which carbon powder is uniformly dispersed in an organic polymer using two parallel conductive wires with a constant interval indicated by 3.3'.
It has a structure in which it is embedded in a resistor 4 having positive thermistor characteristics, and its outer periphery is covered with an electrically insulating material 2. When this organic positive temperature coefficient thermistor cord is energized, current flows through the resistor between the parallel conductors and generates heat, but when the specified temperature is reached, the electrical resistance of the resistor made of the organic positive temperature coefficient thermistor material increases rapidly. It exhibits a self-temperature control function that suppresses the current and prevents further temperature rise.

However, when using this organic positive temperature thermistor cord in a target object to be heated, a lead corresponding to a power cord is required, and usually, for example, as shown in Fig. 2, a lead part is required. Both ends of the organic positive temperature coefficient thermistor cord 1.1 are connected to lead wires 12.12' by connection terminals 11.11', and then the outer periphery of the connection part is connected to the surface j.
Protected by a thermal insulator 13° 13', it can be assembled into a heater coat assembly 10, or as shown in FIG.
At one end of the organic positive temperature coefficient thermistor cord 1, a lead wire 21 and an insulating piece 23 are connected by connecting terminals 22 and 22'.
After sandwiching and connecting, the outer periphery of the connected portion is protected by a heat insulating material 24, and the other cut end is also protected by a heat insulating material 25, thereby forming the heater-coated sugar product 20.
It was used as a summary.

When used as either the assembly shown in Figure 2 or Figure 3,
A connecting terminal is required, and a heat-resistant insulator is required to protect this connecting terminal, and if the self-temperature control heater cord is used in humid conditions, an additional connecting terminal must be provided. Moisture-proof properties are required for insulation materials, and when bending or tensile force is applied to a connection part, it is easy for the connection part to loosen or break, both of which occur due to the presence of the connection part. Defects have been a major drawback of self-regulating heater cord assemblies using conventional organic positive temperature coefficient thermistor cords.

An object of the present invention is to perform a non-heat generating treatment on a part of an organic positive temperature coefficient thermistor cord, and to convert the non-heat generating treated part into a lead-1
・We provide a self-temperature control heater cord with a new structure that eliminates the need for the connection between the lead wire and the organic positive temperature coefficient thermistor cord, which was a source of defects in the past. It's about doing.

Regarding a method to eliminate the need for connection with lead wires, which was a major drawback of conventional self-temperature control heater cords,
As a result of various studies, the inventors of the present invention found that if the organic positive temperature thermistor cord used is reheated to a temperature higher than the melting point of the resistor and then cooled, there will be a problem in the organic polymer during extrusion of the heater cord. We discovered the fact that the arrangement of carbon powder that was uniformly dispersed in the carbon powder is disrupted, and that the resistor that was formed by uniformly dispersing the carbon powder becomes an insulator.By utilizing this feature, we solved the aforementioned problems at once. We have come up with a self-temperature control heater code with a new structure that can solve the problem.

That is, the self-temperature control heater cord of the present invention is an organic positive temperature sensor made by embedding two parallel conducting wires in a resistor in which carbon powder is uniformly dispersed in an organic polymer, and covering the outer periphery with an electrically insulating material. A part of the mister cord is reheated in advance to a temperature higher than the melting point of the resistor and then cooled to become a non-heating element, and a structure is formed in which a heat generating part and a non-heat generating part are shared in a continuous organic positive temperature coefficient thermistor cord, It is characterized in that the non-heat generating part is used as a lead part.

Embodiments of the present invention will be described below with reference to embodiments shown in FIGS. 4 and 5. In FIGS. 4 and 5, the same reference numerals as in the conventional example indicate the same components.

An embodiment of the present invention shown in FIG. 4 was invented in response to the conventional example shown in FIG. Apply non-heating treatment to the required length (parts a and a')
, the other part is left as a heating element, and if the conductor at the end of the lead part is connected to a power source, it operates as a self-temperature control heater cord. The self-temperature control heater cord of this example eliminates the need for separately attached lead wires and insulating the connection terminals and their connections, reducing the number of parts and eliminating defects caused by connections that conventionally occur. and (~ has the effect of obtaining.

FIG. 5 shows another embodiment of the present invention, which was invented in response to the conventional example shown in FIG. The length should be treated as a non-heating element.

X7 part), and the outer periphery of its one end (X part) is covered with an insulator 31
The other end (x7 part) is used as a lead part, and the other part is left as a heating element.If the conductor at the end of the lead part is connected to a power source, it can be used as a self-temperature control heater. It works with code and 1. The self-temperature control heater cord of this example eliminates the need to insulate the separate lead wire and connection terminal of the 1-1 and their connections, reducing the number of parts and eliminating defects caused by connections that conventionally occur. There is an effect that the heating cord can be completely eliminated, and a non-heat resistant insulating material can be used for the insulation of the cut portion of the heater cord, which is one end portion.

According to the present invention, a part of the continuous organic positive temperature coefficient thermistor cord can be made into a non-heating element and can be used as a lead part. There is no need to insulate the connection part between the
Even if this insulation treatment is required, by pre-treating the vicinity of the area to make it a non-heating element17, it is possible to obtain the benefit of using a heat-resistant insulator on the valve surface, which improves economic efficiency and reliability. -1- has a remarkable effect.

[Brief explanation of the drawing]

Figure 1 is a longitudinal cross-sectional view of an organic positive temperature coefficient thermistor cord, and Figures 2 and 3 are a self-temperature control heater coat assembly of a conventional example in which a lead wire is connected to an organic positive temperature coefficient thermistor cord. FIGS. 4 and 5 are longitudinal sectional views showing embodiments of the present invention, respectively. DESCRIPTION OF SYMBOLS 1...Organic positive temperature coefficient thermistor cord, 2...Insulating coating, 3.3'...Conducting wire, 4...Organic positive temperature coefficient thermistor material, 10...Self-temperature control heater coat assembly, 11.11'...Connection terminal, 12.12'...
Riet wire, 13, 13'... Heat resistant insulator, 20...
・Self-temperature control heater cord assembly, 21...Lead wire, 22.22'...Connection terminal, 23...Insulation piece, 24.25...Heat-resistant insulator, 31...Non-heat-resistant sexual insulator. Toshiyuki Funta, Patent Attorney / Figure 2, Figure 3, Figure 4, Figure 5? /

Claims (1)

[Scope of Claims] 1. Self-temperature control characterized in that any part of a continuous organic positive temperature coefficient thermistor cord is treated to be a non-heating element, so that a non-heating part and a heat-generating part are shared within the same cord. heater cord. 2. The self-temperature control heater cord according to claim 1, wherein non-heat generating portions are arranged at both ends of the continuous cord, and the non-heat generating portions are used as lead portions. 3. Non-heat generating parts are arranged at both ends of the continuous cord, the outer periphery of one end is insulated, and the other end is used as a lead part, as described in claim 1. Self-temperature control heater cord. 4. Claims 1 and 4, characterized in that any part of the continuous organic positive temperature coefficient thermistor cord is reheated to a temperature higher than the melting point of the resistor and then cooled to become a non-heating element. Self-temperature control heater cord as described in Items 2 and 3.