JPH01175713A - Capacitor with protection device - Google Patents

Abstract

PURPOSE:To prevent discharge of steam and smoke by making the case double and by reducing increase in gas pressure by activating temperature fuse when inner capacitor discharges gas. CONSTITUTION:It consists of an inner capacitor 1 where a capacitor element 2 is stored and sealed within a case for the inner side and terminals for the inner sides 5 and 6 is pulled out, a case for the outer side 8 which stores the inner capacitor 1, and a temperature fuse 12 which is connected between a terminal for outer side 10 provided through a cap 9 which seals the case for the outer side 8 and the terminal for the inner side 5. For example, the capacitor element 2 is stored within the case for the inner side 3 which consists of aluminum etc., and is sealed and an explosion-proof valve 7 is provided at the cap 4. It allows the explosion-proof valve 7 to be activated and gas of the inner capacitor 1 to be discharged along with steam etc. Then, the temperature fuse 12 is activated by the heat of gas and the capacitor is released from an external circuit. The gas pressure does not increase any more an sealing properties can be maintained.

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 an explosion-proof valve is provided on the lid to prevent damage due to overflowing 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, water vapor 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.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides an internal capacitor in which a capacitor element is housed in an inner case, sealed and an inner terminal is drawn out, and an internal capacitor in which the internal capacitor is housed. and a temperature fuse connected between the outer terminal and the inner terminal, which are provided through a lid that seals the outer case. be.

(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 current is supplied, so the gas pressure does not increase any further and the airtightness can be maintained.

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

Reference numeral 1 denotes an internal capacitor, in which a capacitor element 2 is housed in an inner case 3 made of metal such as aluminum, and hermetically sealed with a lid 4. Inner terminals 5 and 6 pass through the lid 4 and are connected to the capacitor element 2, and an explosion-proof valve 7 is provided. Reference numeral 8 denotes a metal outer case that houses the internal capacitor 1, and is sealed by 119. (2) Outside terminals 10 and 11 are provided through the 9. A temperature fuse 12 is connected between the outer terminal 10 and the inner terminal 5.

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 13 is activated.
is opened from an external circuit.

For example, as an internal capacitor, the rated voltage is 160VAC1.
A 36φ x 82mm aluminum electrolytic capacitor for motor starting with a rated capacity of 150μF was used, the operating temperature of the temperature fuse was set to 70℃, the internal capacitor was housed in a 40φ x 11OL outer case, and a voltage of 160VAC was continuously applied. However, although the temperature fuse operated for about 30 seconds to 8 minutes, no smoke was observed.

(Effects of the Invention) As described above, according to the present invention, when the case is doubled and the internal capacitor releases gas, the temperature fuse is operated to suppress the increase in gas pressure and reduce the u%. A safe@purchased capacitor with good sealing performance can be obtained.

[Brief explanation of the drawing]

The figure shows a front sectional view of an 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...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 capacitor with a safety device comprising a thermal fuse connected between an external terminal and an internal terminal.