JPH0265206A - Capacitor with protective device - Google Patents

Abstract

PURPOSE:To improve vibration-resisting property by a method wherein the increase of gas pressure when gas is emitted from an internal capacitor with a double case is suppressed by the working of a temperature fuse, an excellent state of airtightness is maintained, and the internal capacitor is fixed by a fixing member. CONSTITUTION:An external terminal 10 and an internal terminal 5 are connected by a thermal fuse 12. A cylindrical fixing member 13 is provided between the terminal of the inner case 3 of an internal capacitor 1 and the cover 9 with which an outer case 8 will be closed hermetically, and the internal capacitor 1 is fixed to the outer case 8. When the gas of the internal capacitor 1 is emitted together with vapor and the like by the working of an explosion-proof valve 7, the thermal fuse 12 is operated by the heat of the gas, and a capacitor 14 is released from an external circuit 5. Also, as the internal capacitor 1 is fixed to the external case 8 by the fixing member 13, the cutting and the like of the temperature fuse can be prevented even when vibration is given to the capacitor 14.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a capacitor with a safety device.

(Prior Art) Conventionally, capacitors such as aluminum electrolytic capacitors have a structure in which a capacitor element is housed in a metal case and sealed with a lid.

Gas is generated when overvoltage or overcurrent flows through this capacitor, but the lid is equipped with an explosion-proof valve to prevent damage due to a rise in gas pressure inside the case.

(Problems to be Solved by the Invention) However, when the gas pressure inside the case increases and the explosion-proof valve is activated, steam and smoke are released from the explosion-proof valve, which is easily mistaken as a fire.

The object of the present invention is to improve the above-mentioned drawbacks and provide a capacitor with a safety device that prevents the release of water vapor and smoke.

(Another Means for Solving the Problems) In order to achieve the above object, the present invention has an internal capacitor in which a capacitor element is housed in an inner case, sealed, and an inner terminal is pulled out, and the internal capacitor is housed in the inner case. an outer case, an outer terminal provided through a lid that seals the outer case, a temperature fuse connected between the outer terminal and the inner terminal, the internal capacitor and the inner terminal; The present invention provides a capacitor with a safety device, which includes a fixing member provided between the cap and the inner surface of the lid and capable of fixing the internal capacitor to the outer case.

(Operation) When the gas pressure inside the inner case increases, gas is ejected from a part of the lid along with steam and smoke, but the gas only fills the inside of the outer case and is not released to the outside. The temperature of the gas released from the explosion-proof valve is usually high, so a temperature fuse is activated and the current supply is cut off, so the gas pressure does not rise any further and the airtightness can be maintained.

Further, since the internal capacitor is fixed to the outer case by the fixing member, it is possible to prevent the temperature fuse from being cut off by vibration or the like.

(Example) Hereinafter, the present invention will be explained based on illustrated embodiments.

As shown in FIG. 1, 1 is an internal capacitor, and a capacitor element 2 is an inner case 3 made of metal such as aluminum.
It is housed in a container and sealed with a lid 4. Inner terminals 5 and 6 pass through this lid 4 and are connected to the capacitor element 2, and an explosion-proof valve 7 is installed. 8 is a metal outer case that houses the internal capacitor 1. And M
It is sealed by 9. Outside terminals 10 and 11 are provided to pass through M9. A temperature fuse 12 is connected between the outer terminal 10 and the inner terminal 5. 13 is a cylindrical fixing member, and the internal capacitor 1
It is provided between the end of the inner case 3 and a lid 9 that seals the outer case 8, and fixes the internal capacitor 1 to the outer case 8.

According to the above embodiment, when the explosion-proof valve 7 is activated and the gas in the internal condenser 1 is released together with water vapor, etc., the temperature fuse 12 is activated by the heat of the gas, and the condenser 14 is activated.
is released from the external circuit.

For example, the internal capacitor has a rated voltage of 160VAC,
Using a 36φ x 82L motor starting aluminum electrolytic capacitor with a rated capacity of 150μF, the operating temperature of the temperature fuse was 70℃, the internal capacitor was housed in a 40φ x 11OL outer case, and a voltage of 160VAC was continuously applied. The temperature fuse was activated for approximately 30 seconds to 8 minutes, but no smoke was observed.

Furthermore, even if vibration is applied to the capacitor 14, the fixing member 13
Since the internal capacitor 1 is fixed to the outer case 8, it is possible to prevent the thermal fuse 12 from being disconnected.

Note that, as shown in FIG. 2, an S-shaped fixing member 15 may be used. This is particularly effective when the difference between the outer diameter of the internal capacitor and the inner diameter of the outer case is 3 fRm or more.

(Effects of the Invention) As described above, according to the present invention, the case is doubled and when the internal condenser releases gas, the temperature fuse is operated to suppress the increase in gas pressure, so the sealing performance is good. ,
Further, since the internal capacitor is fixed by the fixing member, a capacitor with a safety device that can improve vibration resistance can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view of an embodiment of the invention, and FIG. 2 is a perspective view of a fixing member used in another embodiment of the invention. 1... Internal capacitor, 2... Capacitor element,
3...Inner case, 4,9...Lid, 5.6...
・Inner terminal, 8...Outer case, 10.11・
...Outside terminal, 12...Temperature fuse, 13.15...Fixing member, 14...Capacitor. Patent applicant Hitachi Capacitor Co., Ltd.

Claims (1)

[Claims] (1) An internal capacitor with a capacitor element stored and sealed in an internal case and an internal terminal pulled out, an external case that stores the internal capacitor, and a lid that penetrates and seals the external case. a thermal fuse connected between the outer terminal and the inner terminal; and a thermal fuse provided between the internal capacitor and the inner surface of the lid to fix the internal capacitor to the outer case. A capacitor with a safety device consisting of a fixing member that can be fixed.