JPH0770408B2 - Capacitor with security device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a capacitor having a safety device.

2. Description of the Related Art Capacitors equipped with conventional safety devices use the deformation of the case that accompanies the capacitor element or its assembly in the case and impregnates / fills with insulating oil, etc. It is equipped with a safety device consisting of an insulating plate for cutting off the current path, a lead plate and a metal fitting, and this type of safety device ruptures the case in the event of a capacitor failure,
It has a great effect to prevent the spread of accidents due to oil spray, fire, etc., and has been put to practical use in many capacitors recently.

Problems to be Solved by the Invention However, all the above-mentioned safety devices are built in the case of the capacitor, and its operation cannot be visually observed from the outside. Therefore, even if the safety device is activated, it is left unnoticed even if an internal failure occurs, causing a trouble such as a decrease in power factor.

Means for Solving the Problems The present invention eliminates the above-mentioned drawbacks, and includes a security device that displays that the security device is activated outside the case so that it can be easily visually confirmed. It is intended to provide a capacitor.

That is, the capacitor element or the assembly thereof and the case of the safety device including the insulating plate, the lead plate, and the metal fitting that cuts the current path by utilizing the deforming force of the case due to the case internal pressure increase at the time of internal failure are housed in the case. Is a capacitor equipped with a display device on the outer wall, a security device mounting bracket on the inner wall, a magnet on the security device, and a security device interposed by compressing a spring between the security device mounting bracket and the metal member. .

Function When the internal pressure of the capacitor rises due to an internal failure of the capacitor with the above-mentioned safety device for some reason, the case expands and deforms, the lead plate forming the safety device is cut, and the repulsive force of the compressed spring causes The security device is divided into two parts so that the magnet moves close to the inner wall of the case, and the magnetic force of the magnet activates the display device attached to the outer wall of the case.

EXAMPLE A capacitor equipped with the safety device of the present invention will be described with reference to an example shown in FIGS.

1 is a longitudinal sectional view of a main part before the operation of the safety device, FIG. 2 is a lateral sectional view of the main part before the operation of the security device, and FIG. 3 is a vertical sectional view of the main part after the operation of the security device. [Fig. 4] is a cross-sectional view of a main part after the operation of the safety device.

1 is a capacitor element or an assembly thereof (a plurality of capacitor elements are assembled), 2 is a case made of metal, 3
Is an L-shaped safety device mounting bracket, 4 is a safety device that cuts the current passage by deformation of the case 2, and the safety device 4 is deformed by an increase in internal pressure and a tensile force exceeding a predetermined value is applied. For example, the bridge 41a and the long hole 4 so as to be cut.
1b, both ends of the insulating plate 41 of the lead plate 42 attached so as to bridge the bridging portion 41a (the slot 41b may be the slit 41c) to the insulating plate 41 made of resin or the like provided with the cutting groove 41c It is formed from an L-shaped metal fitting 43 attached to the. 5 is a spring, 6
Is a magnet attached to the security device 4, 7 is a display device operated by the magnetic force of the magnet 6, 8 is a lead terminal attached to the case 2, and 9 and 10 are lead wires.

A capacitor element or an assembly 1 thereof is housed in a case 2 in which a display device 7 is attached to an outer wall, an L-shaped security device mounting bracket 3 is mounted on an inner wall of the case 2, and the security device mounting bracket 3 and the L-shaped one described above. A safety device 4 having a magnet 6 attached thereto via a compressed spring 5 with a metal member 43 is attached to the safety device mounting metal member 3, and one end of a lead plate 42 of a capacitor element or its assembly 1 is connected by a lead wire 9. After connecting, the lead terminal 8 at the other end of the lead plate 42 is connected by the lead wire 10, the impregnating agent such as insulating oil is impregnated and filled, and the seal is sealed to manufacture a capacitor having a safety device.

Next, during use of the capacitor equipped with the safety device of the present invention, an internal failure occurs for some reason and decomposed gas is generated to raise the internal pressure of the case, and when the internal pressure reaches a predetermined value, the case 2 rapidly expands and deforms, As shown in FIGS. 3 and 4, the insulating plate 41 forming the safety device 4 is pulled to the left and right to cut the bridging portion 41a, and the lead plate 42 is also pulled and cut in the same manner. Is divided into two parts, and the two-part security device 4 moves closer to the inner wall of the case 2 by the restoring force of the spring 5. The display device 7 mounted on the outer wall of the case 2 operates under the influence of the magnet 6 due to the moving proximity of the magnet 6. By visually confirming the operating state of the display device 7, it is possible to detect the operation of the security device 4, that is, the occurrence of an internal failure in the capacitor.

The display device 4 may be any device that operates by the magnetic force of the magnet 6, for example, a magnetic needle.

In the above embodiment, the case where the display device is attached to the outer wall on one side of the case is shown, but the display device is attached to both outer walls of the case facing each other, and the magnets are attached to both sides of the security device so that the display device operates from either side of the case. The state may be visually confirmed.

EFFECTS OF THE INVENTION A capacitor provided with the safety device of the present invention, and a display device capable of easily visually confirming the operating state of the safety device from the outside are provided, which is convenient for maintenance and is the same as the conventional capacitor provided with the safety device. The power factor is not neglected and the power factor is not reduced. Further, the capacitor provided in the safety device of the present invention does not need to be specially provided with a lead terminal or the like in the case by simply attaching the magnet to the safety device inside the case and attaching the display device to the outer wall of the case. It is easy and has the effect of not impairing the reliability of the capacitor at all, and is of great industrial and practical value.

[Brief description of drawings]

The drawings are embodiments of a capacitor having a safety device according to the present invention. FIG. 1 is a longitudinal side view of a main part before the operation of the security device, FIG. 2 is a cross-sectional view of the main part before the operation of the security device, and FIG. FIG. 4 is a vertical cross-sectional view of a main part after the operation of the security device, and FIG. 4 is a cross-sectional view of the main part after the operation of the security device. 1: Capacitor element or assembly thereof 2: Case, 3: L-shaped security device mounting bracket 4: Security device, 41: Insulation plate, 41a: Bridging part 41b: Long hole, 41c: Cut groove, 42: Lead plate 43: L-shaped metal fittings, 5: Spring, 6: Magnet 7: Display device, 8: Lead-out terminal 9, 10: Lead wire

 ─────────────────────────────────────────────────── ─── Continuation of the front page Examiner Shozo Kodera (56) Bibliography Sho 60-89735 (JP, U) Sho 61-205133 (JP, U)

Claims (1)

[Claims] 1. A safety device comprising an insulating plate, a lead plate, and a metal fitting, wherein a capacitor element or an assembly thereof is housed in a case, and an electric current path is cut off by utilizing a deforming force of the case due to an increase in case internal pressure at the time of internal failure. In the provided capacitor,
The display device is attached to the outer wall of the case, the safety device mounting bracket is attached to the inner wall, and the magnet is attached to the safety device.A spring is compressed between the safety device mounting bracket and the metal member to operate the safety device. A capacitor provided with a safety device, wherein the magnet moves and approaches the inner wall of the case at times by the repulsive force of a spring, and the magnet activates the display device.