JPH0831389B2 - 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 A conventional capacitor equipped with a safety device uses a deformation of the case that accompanies a capacitor element or an assembly thereof and impregnates and fills it with insulating oil, etc. due to an increase in internal pressure due to gas generated during an internal failure. It is equipped with a safety device consisting of an insulating plate that cuts the current path, leads and metal fittings, and this type of safety device prevents the expansion of accidents due to case rupture, spray oil, fire, etc. in the event of a capacitor failure. Therefore, it has a great effect 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 makes it possible to take out the fact that the safety device is activated as a signal to the outside of the case. The present invention intends to provide a capacitor having a safety device that can be easily informed of the operation of the safety device by opening the power source or displaying an alarm or a lamp.

That is, in the capacitor including the capacitor element or the assembly 1 thereof in the case 2 and including the safety device 4 for disconnecting the current path when the capacitor including the insulating plate 40, the lead plate 42, and the metal fitting 41 fails, The protection device operation detector 10 provided in the condenser includes a mover 6 and a head protrusion 61.
, Spring receiver 62, continuous portion 63, and spring 5
, A mounting member 7, a bellows 22, a switch 23, a support 24 and a connecting rod 43, and the protection device operation detection in which the mover, the head protruding portion, the spring receiver and the connecting portion are integrated. The movable part of the part 10 includes a mounting bracket 7 fixed to the case 2 and a safety device mounting bracket 3 provided on both sides of the inner wall of the case 2.
The connecting portion 63 is connected to the connecting rod 43 held by the above, and is held by the spring 5 which is compression-loaded between the spring receiver 62 and the mounting metal 7, and the bellows 22 contracts to a part of the case 2. And the head projection 61 of the safety device operation detection movable part 10 is arranged in close proximity so as to fit inside the bellows 22, and the switch 23 is attached to the case 2 by a support 24. The security device operation detector 10 is configured so that the bellows 22 has a contact that opens and closes or opens so that the security device 4 operates to transmit a security device operation signal to the outside.
It is a capacitor equipped with a security device.

Operation When the internal pressure of the capacitor with the above-mentioned safety device causes an internal failure for some reason and the internal pressure of the case rises, the case expands and deforms, the lead plate forming the safety device is cut, and the safety device operates to cause the capacitor. Current is cut off. At the same time, when the case 2 is deformed by the increase of the internal pressure and is pushed outward, the safety device mounting bracket 3 also moves outward, and the connecting rod 43 held by the outer bracket is secured to the security device mounting bracket. 3, the connecting portion 63 of the mover 6 connected to the connecting rod 43 is disengaged, and the extensional force of the spring 5 causes the equal protrusion 61 of the mover 6 to move to the inside of the bellows 22 to push up the bellows. The contact of the switch 23 provided outside the case is opened or closed to issue a safety device operation signal to give an alarm or to release the capacitor from the power supply.

EXAMPLE A capacitor provided with a safety device of the present invention is shown in FIGS.
The embodiment shown in the figure will be described.

FIG. 1 is a vertical side view of the main part before the operation of the safety device, FIG. 2 is a cross-sectional view of the main part before the operation of the security device, FIG. 3 is a perspective view of the movable member withdrawing part in one embodiment, and FIG. FIG. 5 is a vertical cross-sectional view of the main part after the operation of the security device, and FIG. 5 is a cross-sectional view of the main part after the operation of the security device.

1 is a capacitor element or an assembly thereof (a plurality of capacitor elements are assembled together), 2 is a case made of metal,
3 is a security device mounting bracket, 4 is a security device that cuts the current passage by deformation of the case 2, and is a security device mounted on the inner surface of the case by mounting a metal plate 41 and a lead plate 42 to be mounted on an insulating plate such as a resin plate. It is attached to the mounting bracket 3.
6 is a spring on a mounting bracket 7 provided on the inner surface of the case.
Is a mover attached through the one end, and one end thereof is connected to the security device 4. In one embodiment of this connecting portion, one end of the mover 6 is formed into a ring shape, a connecting rod 43 provided in the security device penetrates the ring, and one end thereof is provided in the security device mounting bracket 3 as shown in FIG. It is configured to penetrate through the through hole 31. An expandable bellows 22 is provided on the case wall of the portion of the mover 6 facing the head projection 61. A lead wire from the lead terminal 21 is connected to one end of the lead plate 42 of the safety device 4, and a lead wire from the element or the element assembly unit 1 is connected to the other end. FIG. 4 and FIG. 5 are a longitudinal sectional view and a lateral sectional view showing a state in which the capacitor has an internal failure and the internal pressure is increased, and the case is deformed to operate the safety device.

Capacitors generate decomposition gas due to internal failure,
When the internal pressure of the case rises, the case is deformed and the lead plate 42 of the safety device 4 is broken by the deforming force of the case as shown in FIGS. 4 and 5. As a result, the security device 4 becomes 2
Although it is divided and the space between them is expanded, the connection 43 provided in the security device is pulled out from the ring portion of the mover 6, and the mover 6 is separated.
The connection between the safety device 4 and the safety device 4 is disengaged, the mover 6 is moved by the restoring force of the spring 5, and the head projection 61 of the mover 6 extends the bellows 22 provided on the case to extend the bellows outside the case. The switch can be operated by pushing up the operation lever of the switch 23 mounted close to the switch. As the switch, a general micro switch or a limit switch can be used, and a non-contact type proximity switch may be used.

FIG. 6 shows an embodiment of the connection of the present capacitor. The capacitor 10 is connected to the power source via the switch 20, and the switch 23 mounted outside the capacitor case.
Is connected in series with the trip coil 25 of the switch connected to the operating power supply 40 and the display lamp 30 in parallel. When the safety device operates due to internal failure of the capacitor 10, the contact of the switch 23 is closed, current flows through the trip coil 25 of the switch 20, the switch 20 is opened, and the capacitor is automatically released from the power supply. Indicator lamp 30
Lights up to indicate that the capacitor safety device has been activated. Furthermore, if a bell or buzzer is connected, it is possible to warn that security has been activated.

7 and 8 show another embodiment, in which the bellows 22 attached to the case is attached inside the case, and the switch push rod 24 is attached inside the bellows 22. It is also possible to operate the switch 23 by moving the mover 6 to compress the bellows 22 by the operation of the safety device, the switch push rod 24 in the bellows 22 protruding, and pushing up the operation lever of the switch 23.

Advantageous Effects of Invention A capacitor having a safety device of the present invention is useful for security because it can be notified by an alarm, display, etc. that the safety device has operated, and thus the operation of the safety device can be performed as in the conventional case. It is very convenient for security because the capacitor can be automatically released from the power supply, the lamp is displayed, and the alarm is issued by the operation signal without the power factor being lowered without being noticed. Also, since the switch is attached to the outside, it is only necessary to attach the bellows to the case, and it is not necessary to provide a special lead terminal, so the installation is easy and there is no risk of impairing the reliability of the capacitor. It has great industrial and practical value.

[Brief description of drawings]

The drawings show this embodiment equipped with a security 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. FIG. 4 is a perspective view of a moving-out portion of the movable element in the embodiment, FIG. 4 is a longitudinal sectional view of a main part after the operation of the safety device, and FIG.
FIG. 7 is an embodiment of a connection diagram of a capacitor of the present invention, FIG. 7 is a longitudinal sectional view of an essential portion of another embodiment, and FIG. 8 is a longitudinal sectional view of an essential portion after the operation of FIG. 1: Capacitor element or assembly thereof 2: Case, 22: Bellows, 23: Switch, 24: Support 3: Security device mounting bracket 4: Security device, 40: Insulation plate, 41: Metal part, 42: Lead plate, 43 : Connecting rod 5: Spring 6: Mover, 61: Head protruding part, 62: Spring receiver, 63: Connecting part 7: Mounting bracket 10: Safety device operation detection part

Continuation of front page Examiner Shinichi Yamazaki (56) Bibliography SHO 61-79527 (JP, U) JP SHO 55-8806 (JP, B2)

Claims (1)

[Claims] 1. A capacitor element or an assembly (1) thereof is housed in a case (2), and an insulating plate (40) and a lead plate (42).
In a capacitor having a safety device (4) for disconnecting a current path when the capacitor consisting of a metal and a metal fitting (41) fails, a safety device operation detecting section (10) provided in the capacitor is provided.
Is a mover (6), a head protrusion (61), a spring receiver (62), a connecting portion (63), a spring (5),
Mounting bracket (7), bellows (22), switch (23)
And the supporting member (24) and the connecting rod (43), the movable part of the safety device operation detecting part (10) in which the mover, the head protruding part, the spring receiver and the connecting part are integrated, The mounting bracket (7) fixed to the case (2) and the case (2)
The connecting portion (63) is connected to the connecting rods (43) held by the safety device mounting brackets (3) provided on both sides of the inner wall of the vehicle, and the compression is made between the spring receiver (62) and the mounting bracket (7). The bellows (22), which is held by the loaded spring (5) and is contracted to a part of the case (2), has a head projection (61) of the movable part (10) for detecting the operation of the safety device, The switch (23) is attached to the case (2) by the support (24) so that the bellows (22) extends to open or close the bellows (22). The security device is provided with a security device operation detection unit (10) having a contact point for activating the security device (4) and transmitting a security device operation signal to the outside. Capacitors.