JPS6074370A - Electric constituent - 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 [Industrial Field of Application] The present invention relates to electrical components incorporating a temperature-reactive device, in particular to the provision of a temperature-reactive device that plays a protective role in the electrical component or related components. Regarding components.

[Conventional technology]

Electrical components incorporating various types of temperature responsive devices are known. By the way, one type of temperature reaction device is one in the form of a bimetal member that deforms when heated and uses this deformation to open or short circuit a circuit.

However, such devices are relatively expensive and require careful adjustment.

Another type of temperature-responsive device consists of an elastic conductor held under tension, usually by means containing a thermo-softening material, which becomes elastic when softened at high temperatures. The configuration is such that the tension on the conductor is released so that the conductor acts to short or open the circuit. In such devices, the heat softening material may be a metal fusible material, such as a relatively low melting point alloy or a fusible insulating material such as a heat softening material that softens at the required temperature.

[Problem that the invention seeks to solve]

If this device is used with a fusible insulating material that is normally elastic under tension (which holds the electrical body out of engagement with the cooperating contacts), thermal softening of the insulating material will result in an elastic conductor. Although the body engages the contacts, there is always the possibility that the softened insulating film remains trapped between the engaging members, preventing the protective short-circuit from occurring. .

It is an object of the present invention to provide an improved temperature reactor for use in electrical components.

[Means for solving problems]

In order to solve the above-mentioned problems, the electrical component provided by the present invention includes a member made of a plastic material having heat-responsive recovery properties, and includes a temperature-reacting device formed to contract in the longitudinal direction when heated. It has become.

Another electrical component provided by the present invention includes at least two electrodes or regions that are either short-circuited or open-circuited when the associated temperature-responsive device reacts to an increase in temperature. The short-circuit or open-circuit function is controlled by a member made of a heat-resilient plastic material that is configured to contract longitudinally when heated.

[Effect]

The invention may particularly be used as an overtemperature protection device mounted on components such as overvoltage arresters. Overvoltage arresters are in the form of two electrodes placed at a distance within a gas-filled enclosure, forming a gap that generates a spark. Such an arrester may be a three-electrode arrangement, in which case the electrodes of box 3 are usually located in the region of the spark-generating gap.

In one preferred form of the invention, the reactor comprises a length of resilient, hard metal wire, at least a portion of which is characterized by thermal resiliency, such that it contracts longitudinally when heated. It is surrounded by a sleeve made of insulating plastic material with a When this sleeve contracts longitudinally, one or more portions of the wire are exposed and act as a tether, or one or more of the wires JJ, 1. (7) The exposed part is covered with an insulating plastic leaf and acts to open the circuit.

In another embodiment, a member made of an insulating plastic material having heat-responsive recovery properties may be placed between two parts as a separator (at least one of these two parts is When heated, the insulating plastic member shrinks sufficiently in the longitudinal direction to bring the two parts into contact, creating a short circuit.

A variety of plastic materials are available that have thermal recovery properties. Preferred materials for use in the present invention include irradiated polyolefins and modified polyvinylide 7
ne fluorides).

〔Example〕

Embodiments of the invention will now be described in connection with the accompanying drawings.

FIG. 1 shows a temperature reactor in a simple form. Tempered spring wire 1 (e.g. plated steel wire or steel wire)
IJ copper wire) is a heat-shrinkable material, that is, thermal reaction recovery property (
Sleeve 2 made of plastic material with memory)
It's inside. The sleeve 2 is provided with a cutout or notch 3 at the midpoint of its length, so that the spring wire 1 is exposed and can come into contact with a conductor, such as the center terminal pin of a three-pole overvoltage arrester. , FIG. 2 is a plan view showing the goosink of a three-pole overvoltage arrester. It consists of FIG. 3 is an elevational view of the device. The arrester is equipped with the thermal reaction device shown in FIG. 1, and as seen in FIG. Electrical contact is possible and the end pin 5 and the spring wire 1 are insulated by the sleeve 2.

The exposed spring wire need only be attached to or rested on the pin 4.

FIG. 4 is a plan view showing the same component after overheating due to continuous overvoltage 11 applied to the arrester. It can be seen that the sleeve 2 shrinks in the longitudinal direction due to the heat and the tempered spring wire 1 and the end pin are in electrical contact. The amount of shrinkage may be up to about 50% of the length of the sleeve. Because the end pin and the middle pin are electrically connected to each other, the discharge through the arrester is stopped and no further heating can occur. Also, because the terminals are connected together in this manner, the equipment attached to the arrester is still protected from damage due to overvoltage or excessive voltage surges.

FIG. 5 shows an embodiment of the surge arrester without pins, the central part of the spring wire being welded at 6 directly to the central electrode 7 of the arrester.

Both ends 1a of the spring wire 1 are shifted from the ends of the sleeve 2 and come into contact with the electrodes 8 at both ends, but normally the sleeve 2
It is electrically insulated from the electrode 8 by .

Furthermore, when the sleeve 2 is heated and contracts in the longitudinal direction, the spring wire contacts the electrode 8 and short-circuits the electrodes 7 and 8.

The principles of the present invention using a heat-shrinkable sleeve that shrinks longitudinally when heated can also be applied to other types of overvoltage arresters, such as the one shown in FIG.

In this embodiment, the gas exhaust pipe 10 is welded between two terminal plates 11, and the ceramic spacer 12 is also connected to these two YRi! Place it between the finishing boards. One of these spacers surrounds a compression spring 9, which normally carries a heat-shrinkable sleeve 2a surrounding its ends. When the sleeve 2a is heated and contracts longitudinally, both ends of the spring are exposed and come into contact with the electrodes, performing a shorting function. A portion of this spring may be reverse-wound to secure the sleeve at an intermediate point.

FIG. 7 was arranged to break or open the normal connection in response to overheating! FIG. 2 is a plan view of a component 13 with an MA degree reactor. The temperature-responsive device consists of a spring tension wire 14 enclosed in a sleeve 2 of heat-shrinkable plastic material, the sleeve 2 being provided with three cutouts or notches arranged opposite the contact pins 16. For this purpose, all three pins are usually connected together. When heated, the sleeve shrinks longitudinally and the two outer notches move out of the vicinity of the pin and out of the portion of the insulating sleeve interposed between the spring wire and the pin, thereby opening the circuit.

Although the present invention has been described in detail, it should be understood that while it is primarily applied to overvoltage arresters, the invention may also be applied to any other electrical component to protect it from damage due to overheating. do not have. For example, the components of FIG. 7 may be integrated circuits or microchips. Furthermore, the temperature reaction device itself may be formed as a separate component, mounted near and connected to the component that is to be protected from overheating.

〔effect〕

As mentioned above, since the electrical component according to the present invention uses a plastic material that has thermal reaction recovery properties, it can be applied to any electrical component that requires actions such as shorting and opening an electrical circuit, and is easy to use. This configuration has the significant effect of providing economical electrical components.

[Brief explanation of drawings]

1 is a diagram showing one form of the temperature reaction device according to the present invention, FIG. 2 is a plan view of electrical components incorporating the device of FIG. 1, FIG. 3 is a side view of the electrical components, and FIG. FIG. 5 is a side view of another embodiment; FIG. 6 is a side view of yet another embodiment; FIG. 7 FIG. 3 is a plan view of another embodiment. 1...Metal wire, 2...Sleeve, 3...Notch, 4
...Medium bottle, 5... End pin, 7... Electrode, 8... Electrode, 9... Compression splash. Patent Applicant Dubilier Public Limited “
Company Agent Kama 1) Bun 2

Claims (9)

[Claims] (1) An electrical component consisting of a temperature reaction device, characterized in that it is provided with a member made of a plastic material having thermal reaction resilience and formed to contract in the longitudinal direction when heated. parts. (2) In an electrical component having at least two electrodes or regions, the electrodes shorting or opening the circuit when a temperature-responsive device integral with the electrical component reacts to an increase in temperature; An electrical component, characterized in that the short-circuiting or opening function is controlled by a member made of thermoresilient plastic material, which is configured to contract when heated. (3) The temperature reaction device consists of a length of hard, elastic metal wire 1, and at least a portion of the length thereof has a property of thermal reaction resilience such that it contracts in the longitudinal direction when heated. 3. Electrical component according to claim 1, characterized in that it is surrounded by a tube 2 made of insulating material. (4) When the sleeve 2 contracts in the longitudinal direction, the metal wire 1
4. Electrical component according to claim 3, characterized in that one or more portions of are exposed and act as a short circuit. (5) When the sleeve 2 contracts in the longitudinal direction, the gold ig%
4. Electrical component according to claim 3, characterized in that one or more exposed parts of the wire (1) are covered with an insulating plastic sleeve, which serves to open the circuit. (6) Consists of a part 2 made of a highly malleable plastic material with a thermal reaction device arranged as a separator between two parts, at least one part 1a of the two parts being in contact with the other part 1a. By being elastically biased against the two parts 8 and heated, the part 2 made of insulating plastic material contracts sufficiently in the longitudinal direction, and the two parts 1a and 8 come into contact with each other. 'I' indicates that a short circuit is caused by 'I'! Claims 1 or 2, which are
Electrical components listed in Section. (7) Electrical component according to claim 3 or 4, characterized in that the temperature reaction device is in the form of a coiled spring 9. (8) The electrical component according to any one of claims 1 to 7, wherein the plastic material having thermal reaction restorability is irradiated polyolefin or modified polyvinylidene fluoride. (9) Claims characterized in that the invention comprises an overvoltage arrester in the form of two electrodes forming a gap and placed at a certain distance in a gas-filled enclosure. The electrical component according to any one of items 1 to 8.