JPH076867A - Melting type triple control one line type insulating heater wire - Google Patents

Abstract

PURPOSE:To prevent abnormal heating by arranging a P resistance conductor to detect an abnormal heating temperature, an internal insulator melted at the abnormal heating temperature and an NTC semiconductor which covers an internal conductor and detects a preset heating temperature. CONSTITUTION:An NTC semiconductor 4 acts on a temperature of an internal conductor 3, and flows a thermistor electric current, and turns on and off electric power supply of the conductor 3 according to the electric current quantity, and holds a constant temperature. When a temperature cannot be controlled by the semiconductor 4 due to trouble or the like, the temperature is controlled by a P resistance conductor 1 being the second temperature sensor. Since this conductor 1 exists on both ends of an insulating heating wire, an abnormal high temperature is generated between them, and when the conductor 1 becomes a prescribed temperature or more, since resistance is increased suddenly, an abnormal heating temperature can be detected reliably. When it becomes the abnormal temperature detectable by the conductor 1, an internal insulator 2 is melted, and the conductor 1 and the conductor 3 are short- circuited to each other. A short circuit current is generated, and an electric power supply fuse is gone, so that heating of the conductor 3 is stopped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fusion type triple control I-wire type insulated heating wire used for electric blankets, electric carpets and the like.

[0002]

2. Description of the Related Art Insulating heating wires, which are mainly wired on electric blankets, electric carpets, electric duvets, etc., are conventionally arranged by closely contacting a heating wire (heater) and a temperature detecting wire (sensor). There is a so-called "II wire type" configured as described above and a so-called "I wire type" having one heating wire and a heating function and a temperature detecting function.

In the II-wire insulated heating wire, the temperature detection wire is provided with an NTC semiconductor, which has an electric resistance (impedance) that decreases in synchronization with a temperature rise, between the inner electrode and the outer electrode. In addition, the heat generating wire contained a meltable insulator sandwiched between the electrodes.

When this heating wire is energized, it generates heat and conducts heat to the temperature detection wire. Usually, the temperature is detected by the temperature sensor function of the NTC semiconductor, and the temperature is adjusted so as to reach a predetermined temperature.

For example, when the electric resistance of the NTC semiconductor at 60 ° C. is 50 KΩ, if the controller is set to that condition, the electric resistance of the NTC semiconductor will increase when the temperature rises to 60 ° C. Since the thermistor current corresponding to that decreases to 50 KΩ, if the current value increases or decreases more than this, the temperature of the heating element can be controlled to 60 ° C by turning on / off the power of the heating element with a relay switch or thyristor. ing.

[0006]

If, for example, a thick cushion such as a cushion is left on the electric carpet or the like using the II-wire type insulated heating wire for a long time, heat dissipation is hindered, and the location is locally localized. Abnormal heat is generated, the temperature control capability reaches the limit, and the temperature sensor function is lost, so that the temperature abnormally rises and becomes a dangerous state.

That is, the electric resistance of the NTC semiconductor is N
Since the total electric resistance is the total electric resistance of the TC semiconductor over the entire length, even if an abnormally high temperature is locally generated in the insulated heating wire and the electric resistance of that part is lowered, if the temperature of the other part is low, Since the electric resistance does not decrease, the temperature is not controlled and it becomes impossible to stop the local temperature rise.
This phenomenon occurs especially in an environment where the ambient temperature is extremely low.

Therefore, when the temperature cannot be controlled due to the deterioration of the temperature sensor function of the NTC semiconductor or the failure of the controller, and the temperature rise cannot be stopped, an abnormally high temperature is finally reached. As a result, the insulator between the electrodes of the heating wire is melted, and the power supply fuse is blown by the short-circuit current generated there.

However, melting of the above-mentioned insulator, which is the final safety device, means that the insulated heating wire is destroyed,
The product will be unusable. Moreover, the above-mentioned insulator is often heat-cured and loses its melting function, and the heat-curing may accelerate carbonization, resulting in a very dangerous state in which the final safety device does not function.

On the other hand, the conventional I-wire type insulated heating wire is obtained by simply simplifying the II-wire type insulated heating wire into a single wire. The heating conductor is inside, the signal conductor is outside, and the NTC semiconductor is in the middle. It is provided, and normal temperature control is the same as in the case of the II wire type insulated heating wire.

Therefore, in the case of the I-wire type insulated heating wire, like the II-wire type insulated heating wire, if local abnormal heat generation occurs, it cannot be prevented, and moreover, it should be a final safety device. Since there is no meltable insulator, if a trouble such as a controller failure occurs, abnormal heat generation cannot be stopped, and safety is inferior to the II-wire insulated heating wire.

Therefore, in the present invention, in addition to the temperature sensor function for normal temperature control, a temperature sensor function (self-temperature control function) which is a final safety device and a local abnormal heat generation before product destruction are prevented. It has a temperature sensor function for controlling the temperature, and enables three-step temperature control, thereby reducing the occurrence of product destruction I
An object is to provide a wire-type insulated heating wire.

[0013]

In order to achieve the above object, the present invention provides a reinforcing core made of heat-resistant tough fiber, and a P-resistive conductor wound around the core for detecting an abnormal heat generation temperature. ,
An inner insulator covering the P-resistive conductor and melting at an abnormal heat generation temperature higher than the abnormal heat generation temperature, a heat generating inner conductor wound around the inner insulator, and a preset heat generation covering the inner conductor. An NTC semiconductor for temperature detection, an outer conductor wound around the NTC semiconductor, a separator covering the outer conductor, and an exterior insulator covering the separator.

Further, a P resistance conductor for detecting an abnormal heat generation temperature, an internal insulator which covers the P resistance conductor and melts at an abnormal heat generation temperature higher than the abnormal heat generation temperature, and is wound around the internal insulator. A heat generating inner conductor, a set heat generation temperature detecting NTC semiconductor that covers the inner conductor, an outer conductor wound around the NTC semiconductor, a separator that covers the outer conductor, and an exterior that covers the separator. And an insulator.

Further, a P resistance conductor for detecting an abnormal heat generation temperature, an internal insulator covering the P resistance conductor, a heat generating internal conductor wound around the internal insulator, and covering the internal conductor A set heat generation temperature detecting NTC semiconductor that melts at an abnormal heat generation temperature higher than the above abnormal heat generation temperature, and the NTC semiconductor.
An outer conductor wound around the semiconductor, a separator that covers the outer conductor, and an exterior insulator that covers the separator,
It is equipped with.

[0016]

According to the insulated heating wire of claims 1 and 2, the normal temperature adjustment for heat generation of the inner conductor due to the energization with the power source is performed by the temperature detection of the NTC semiconductor having the first temperature sensor function. Performed by.

An abnormally high temperature locally occurs in the insulated heating wire,
When the temperature detection capability of the NTC semiconductor cannot control due to a trouble or the like, the temperature can be controlled by detecting the temperature of the P-resistive conductor having the second temperature sensor function to prevent abnormal temperature rise. When the abnormal temperature rise is subsided and the function of the NTC semiconductor is restored, normal temperature control is restored.

When troubles such as failure occur in both the NTC semiconductor and the P resistance conductor, the functions of the first and second temperature sensors are lost, temperature control becomes impossible, and an abnormally high temperature occurs, the third The internal insulator is melted to function as a temperature sensor, the P resistance conductor and the internal conductor are short-circuited, and the short-circuit current generated there blows the power supply fuse to ensure final safety.

According to the insulated heating wire of the first aspect, even if a tensile force acts on the insulated heating wire, the toughness of the core body restricts the extension of the wire, so that the P resistance conductor or the like on the outer peripheral portion of the core body is disconnected. To be prevented. Moreover, since the P-resistive conductor is wound around the core, even if a strong pulling force such as disconnection of the core acts, the P-resistive conductor extends like a coil spring and can absorb the pulling force. Do not disconnect.

Further, according to the insulated heating wire of the third aspect, the normal temperature adjustment for the heat generation of the inner conductor due to the energization with the power source is performed by the temperature detection of the NTC semiconductor having the first temperature sensor function. Be done.

An abnormally high temperature is locally generated in the insulated heating wire,
When the temperature detection capability of the NTC semiconductor cannot control due to a trouble or the like, the temperature can be controlled by detecting the temperature of the P-resistive conductor having the second temperature sensor function to prevent abnormal temperature rise. When the abnormal temperature rise is subsided and the function of the NTC semiconductor is restored, normal temperature control is restored.

When troubles such as failure occur in both the NTC semiconductor and the P resistance conductor, the functions of the first and second temperature sensors are lost, temperature control becomes impossible, and an abnormally high temperature occurs, the third NTC to function as a temperature sensor
The semiconductor is melted, the inner conductor and the outer conductor are short-circuited, and the short-circuit current generated there blows the power fuse to secure the final safety.

[0023]

The present invention will be described in detail below with reference to the drawings showing the embodiments.

FIG. 1 shows an embodiment of the fusion type triple control I-wire type insulated heating wire according to the present invention, which is used for an electric blanket, an electric carpet or the like equipped with various temperature controllers. As the temperature controller, it is preferable to use a well-known electronic control type one using an electronic element such as a thyristor or a diode.

This insulated heating wire comprises a reinforcing core 10 and a core.
An abnormal heat generation temperature detection P-resistance conductor 1 spirally wound around 10 and an internal insulator 2 covering the P-resistance conductor 1
A heat generating inner conductor 3 spirally wound around the inner insulator 2, a set heat generation temperature detecting NTC semiconductor 4 covering the inner conductor 3 for conduction, and a spiral winding around the NTC semiconductor 4. It is provided with an outer conductor 5 that is turned to be conductive, a separator 6 that covers the outer conductor 5, and an exterior insulator 7 that covers the periphery of the separator 6.

The core 10 is a reinforcing base for improving the tensile strength of the insulated heating wire, and is made of polyethylene terephthalate fiber, aramid fiber, polyarylate fiber or the like which is tough and has excellent heat resistance.

Next, as shown in FIG. 2, the P resistance conductor 1 is
It is a resistor having a positive characteristic that its electric resistance rises in synchronization with temperature rise, and has electrodes at both ends of its length as shown in FIG.

As the material of the P resistance conductor 1, a metal such as a nickel wire or a nickel alloy wire which is excellent in positive resistance change is used, and particularly, a material whose conductor resistance value greatly changes with temperature change is used. preferable.

Further, the internal insulator 2 of FIG. 1 normally insulates the P resistance conductor 1 and the internal conductor 3 from each other. The internal conductor 3 abnormally generates heat, and the abnormal heat generation temperature detected by the P resistance conductor 1 is detected. When the temperature becomes higher than the normal temperature (for example, 160 ° C to 170 ° C), the internal insulator 2 is melted by the heat (to function as the third temperature sensor), and the P resistance conductor 1 and the internal conductor 3 are melted.
Can be short-circuited.

The internal insulator 2 is made of synthetic resin or the like,
The material has the above temperature (for example, 160 ℃ to 170 ℃)
It is preferable to use polyamide, polybutylene terephthalate, or an alloy of polyamide and polyethylene, which has the property of easily melting without causing heat curing.

Next, the inner conductor 3 has oxidation resistance and functions as a heating element (heater) when energized with a power source and also as a thermistor electrode of the NTC semiconductor 4. The short-circuited inner insulator 2 is melted, and
When short-circuited, the inner conductor 3 functions as a signal conductor that sends a short-circuit current generated there to the temperature controller.

The material of this inner conductor 3 is JIS C 31
It is preferable to use tin-plated round wire or foil wire of an electric hard copper wire that meets the regulations of 01.

As shown in FIGS. 3 and 4, the NTC semiconductor 4 functions as an insulator at room temperature (standard 20 ° C.),
The NTC (Negative Temperature Coefficient) is such that the electric resistance (impedance) decreases in synchronization with the temperature rise, and it functions as a conductor when it reaches a preset temperature.
Thermistor-Negative characteristic temperature coefficient thermistor) function, and functions as a first temperature sensor (thermistor) that detects the set heat generation temperature of the internal conductor 3.

The NTC semiconductor 4 has a structure in which a large number of resistors 8 are arranged between a pair of electrodes, and a thermistor current flows through the resistors 8 ... Since the electrical resistance of 4 becomes small, the thermistor current easily flows.

For the NTC semiconductor 4, it is preferable to use a polymer semiconductor having excellent durability over time, and the material thereof is preferably a compound based on polyvinyl chloride.

Next, the outer conductor 5 in FIG.
Together with this, it functions as a thermistor electrode of the NTC semiconductor 4. As the material of the outer conductor 5, it is preferable to use tin-plated round wire or foil wire of an electric hard copper wire that meets the requirements of JIS C 3101.

When the inner conductor 3 exceeds the set heat generation temperature, NT
Since the thermistor current flows through the C semiconductor 4, the outer conductor 5 functions as a signal conductor for sending this current to the temperature controller.

The separator 6 is provided to prevent the NTC semiconductor 4 and the exterior insulator 7 from acting on each other and protect the NTC semiconductor 4, and the chemical and physical effects of the exterior insulator 7 are exerted. It is a separation layer to protect from the influence.

The separator 6 is made of synthetic resin or the like,
As the material, it is preferable to use polyethylene terephthalate or the like.

Next, the exterior insulator 7 serves to insulate the outer conductor 5 and protect the entire insulated heating wire.

The exterior insulator 7 is made of synthetic resin or the like,
As the material, it is preferable to use a polymer compound containing polyvinyl chloride as a heat resistant compound.

In the melting type triple control I-wire type insulated heating wire constructed as described above, the normal temperature adjustment for the heat generation of the inner conductor 3 by the energization with the power source is the first temperature. The temperature is detected by the NTC semiconductor 4, which is a sensor.

That is, the NTC semiconductor 4 acts sensitively on the temperature of the inner conductor 3 to flow a thermistor current, and the power of the inner conductor 3 is turned on by the temperature controller based on the amount of the current.
・ Turn it off and maintain a constant temperature.

For example, when the temperature is adjusted to 60 ° C. and the electric resistance of the NTC semiconductor 4 at 60 ° C. is 50 KΩ, if the controller is set to that condition, the temperature will be 60 ° C. When the temperature rises, the electric resistance of the NTC semiconductor 4 decreases to 50 KΩ, and a thermistor current corresponding to the electric resistance flows.

In response to this thermistor current, the relay switch or thyristor is actuated to turn off the power of the internal conductor 3 (OFF), and if the temperature falls below 60 ° C., the thermistor current will decrease. The relay switch or thyristor to activate the inner conductor 3
Turn on (ON) and raise the temperature to 60 ° C.

The temperature is controlled by repeating ON / OFF of the power source so that a predetermined temperature (60 ° C.) can be maintained.

By the way, if the length of the insulated heating wire provided on the electric carpet or the like is, for example, 30 m, the length of the NTC semiconductor 4 is also 30 m.
The electrical resistance at 50 ° C is 50 KΩ "
Since the total value of the electric resistance (of the plurality of resistors 8 in FIG. 3) in the length of is 50 KΩ, for some reason, the insulated heating wire is locally exposed to an abnormally high temperature (for example, 100
) Occurs and the electric resistance of the NTC semiconductor 4 in that part decreases, the total value does not reach 50 KΩ if the temperature in other parts is low, so the above temperature control is not performed and local The temperature rise cannot be stopped.

Therefore, when such an abnormally high temperature locally occurs or the temperature cannot be controlled by the NTC semiconductor 4 due to a trouble or the like, the temperature is controlled by the P resistance conductor 1 which is the second temperature sensor.

Since the electrodes of the P-resistive conductor 1 are located at both ends of the length of the insulated heating wire (for example, 30 m), if an abnormally high temperature occurs between them and the P-resistive conductor 1 reaches a predetermined temperature or higher,
Since the resistance rapidly increases, the abnormal heat generation temperature can be detected quickly and reliably.

Therefore, even if an abnormally high temperature is about to occur,
The rising temperature can be suppressed to, for example, 80 ° C. or lower by the above controller or the like, and it becomes possible to prevent abnormally high temperature from occurring. The P resistance conductor 1 which is the second temperature sensor
The abnormal high temperature subsides due to the action of
When the function of is restored, the normal temperature control by the first temperature sensor is restored.

In addition, the NTC semiconductor 4 which is the first temperature sensor and the P resistance conductor 1 which is the second temperature sensor have troubles, or the temperature control function is lost due to the failure of the controller or the like. If the temperature rise due to the heat generation of the conductor 3 cannot be stopped, the final safety is secured by the inner insulator 2 which is the third temperature sensor.

That is, the abnormal heating temperature higher than the abnormal heating temperature detected by the P resistance conductor 1 (for example, 160 ° C. to 170 ° C.).
(° C), the internal insulator 2 is melted and the P resistance conductor 1 and the internal conductor 3 are short-circuited.

As a result, a short-circuit current is generated between the P-resistive conductor 1 and the inner conductor 3, the power supply fuse is blown, and the heat generation of the inner conductor 3 can be stopped. A device with a device for cutting the power fuse is called a fusion type. This third temperature sensor is the final safety device and is also called the self-temperature control function.

The above temperature control is called triple control, and the first
The second and third temperature sensors automatically switch and function by their own judgment according to the set order.

Depending on the temperature controller used, the P resistance conductor 1 may be used as the first temperature sensor and the NTC semiconductor 4 may be made to function as the second temperature sensor.

The embodiment of FIG. 1 is particularly suitable for the case where tensile strength is required. Even if a tensile force acts on the insulated heating wire, the tough core body 10 restricts the elongation and the outer circumference of the core body 10 is suppressed. Disconnection of the P resistance conductor 1 and the like in the portion is prevented. Moreover,
Since the P resistance conductor 1 is spirally wound around the core body 10, even if a strong pulling force acts such that the core body 10 is broken, the P resistance conductor 1 extends like a coil spring and the pulling force is increased. Can be absorbed and does not easily break.

Next, FIG. 5 shows another embodiment in which the core body 10 in FIG. 1 is omitted and the P-resistance conductor 1 is formed as a straight line having appropriate flexibility and rigidity. The rest of the configuration is the same as the embodiment of FIG.

In this case, it is not necessary to wind the P resistance conductor 1 and the number of parts is reduced, so that there is an advantage that the manufacture is easy. The temperature control is performed by the same triple control as that of the embodiment of FIG.

When such a P-resistive conductor 1 is used, particularly when tensile strength is required, as shown in FIG. 6, a reinforcing member serving as a separator is provided around the inner insulator 2. 9 is covered, and the inner conductor 3 is spirally wound around the reinforcing body 9.

The reinforcing member 9 is made of a synthetic resin fiber or tape, and the material thereof is preferably aramid or polyethylene terephthalate.

Further, the NTC semiconductor 4 in this case normally functions as a first temperature sensor (thermistor) for detecting the heat generation temperature of the inner conductor 3 and also becomes an abnormal heat generation temperature (for example, 160 ° C. to 170 ° C.). The heat is melted, the internal conductor 3 and the external conductor 5 are short-circuited, a short-circuit current is generated there, and the power fuse can be blown.

That is, in this embodiment, the NTC semiconductor 4
, Function as the first and third temperature sensors in the previous embodiment.

As described above, when the NTC semiconductor 4 has a melting function, a polyamide, a polybutylene terephthalate, or a polyamide and a polyethylene having a property of easily melting at the above temperature (for example, 160 ° C. to 170 ° C.) is used. A compound based on alloy or the like is used.

Since the configuration other than the above is the same as that of the previous embodiment, its explanation is omitted.

However, the fusion type triple control I-wire insulated heating wire shown in FIGS. 5 and 6 can be used also as the temperature detection wire in the II-wire insulated heating wire, in which case the inner conductor 3 Functions only as a thermistor electrode, not as a heating element. Further, the reinforcing member 9 of the embodiment of FIG.
Serves as a separator.

The present invention is not limited to the above-mentioned embodiments, and the design can be freely changed without departing from the gist of the present invention. For example, the NTC semiconductor 4 having the melting function of the embodiment of FIG. 6 may be used as the NTC semiconductor 4 of the embodiment of FIG. 5 to function as the first and third temperature sensors.

[0067]

Since the present invention is constructed as described above, it has the following great effects.

The melting type triple control I-wire type insulated heating wire according to any one of claims 1 to 3 is only one, and in addition to the first temperature sensor function for normal temperature control, it is a final safety device. It has a certain third temperature sensor function (self-temperature control function) and a second temperature sensor function to prevent abnormal heat generation before insulation heating wire breakdown, and automatically controls the temperature in three stages. can do.

As a result, with the insulated heating wire of the present invention, the incidence of defective disposal due to the melting of the insulator, which frequently occurs in the products using the conventional insulated heating wire, can be greatly reduced. The effect of extending the life of the product is enormous.

The fusion type triple control I-wire type insulated heating wire of claim 1 is suitable particularly when tensile strength is required. Even if a tensile force acts on the insulated heating wire, the P-resistive conductor 1 etc. can be reliably obtained. It is possible to prevent breakage of the wire and improve reliability.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is a graph showing positive characteristics.

FIG. 3 is an explanatory diagram of an NTC semiconductor.

FIG. 4 is a graph showing NTC characteristics.

FIG. 5 is a side view showing another embodiment.

FIG. 6 is a side view showing another embodiment.

FIG. 7 is an explanatory diagram of a P resistance conductor.

[Explanation of symbols]

 1 P Resistance Conductor 2 Internal Insulator 3 Internal Conductor 4 NTC Semiconductor 5 External Conductor 6 Separator 7 Exterior Insulator 10 Core

Claims (3)

[Claims] 1. A reinforcing core 10 made of heat resistant and tough fiber,
A P-resistive conductor 1 for detecting an abnormal heat generation temperature wound around the core body 10, an internal insulator 2 covering the P-resistive conductor 1 and melting at an abnormal heat generation temperature higher than the abnormal heat generation temperature;
A heat generating internal conductor 3 wound around the internal insulator 2, and a set heat generation temperature detecting NTC semiconductor 4 covering the internal conductor 3.
And the outer conductor 5 wound around the NTC semiconductor 4, the separator 6 that covers the outer conductor 5, and the exterior insulator 7 that covers the separator 6. Control I-wire type insulated heating wire. 2. A P-resistive conductor 1 for detecting abnormal heat generation temperature,
An internal insulator 2 which covers the P-resistance conductor 1 and melts at an abnormal heat generation temperature higher than the abnormal heat generation temperature, a heat generating internal conductor 3 wound around the internal insulator 2, and the internal conductor 3 A set heat generation temperature detecting NTC semiconductor 4 for covering the outer conductor 5, an outer conductor 5 wound around the NTC semiconductor 4, a separator 6 for covering the outer conductor 5, and an exterior insulator 7 for covering the separator 6, A fusion type triple control I-wire type insulated heating wire characterized by comprising: 3. A P-resistive conductor 1 for detecting abnormal heat generation temperature,
An internal insulator 2 that covers the P-resistance conductor 1, an internal heat-generating conductor 3 that is wound around the internal insulator 2, and an abnormal heat generation temperature that covers the internal conductor 3 and that is higher than the abnormal heat generation temperature. NTC semiconductor 4 for setting heat generation temperature detection that melts at
A fusion-type triple control I including an outer conductor 5 wound around the NTC semiconductor 4, a separator 6 covering the outer conductor 5, and an exterior insulator 7 covering the separator 6. Wire type insulated heating wire.