Resistance fuse protector with over-temperature protection function

Abstract

A resistance fuse protector with over-temperature protection relates to the technical field of resistors and comprises a casing, wherein uniformly distributed through holes are formed in the top and the bottom parts of the casing, and a movable cavity communicated with the inner sides of the through holes is arranged in the middle of the casing. According to the resistance fuse protector with theover-temperature protection function, through the cooperative use of a bimetallic strip and a plugging block II, when the temperature of a fusing resistor is too high, the gas in the movable cavity isthermally expanded, two piston rods move towards the top part and the bottom part respectively under the pressure action of the gas, and meanwhile, the bimetallic strip is heated to overturn towardsthe left side, electric contacts are no longer clamped with a conductive groove, so that the fusing resistor is disconnected, the whole circuit is disconnected, and when the temperature is further increased, the plug block II turns outwards under the action of air pressure to discharge redundant gas, so that the safety of the fuse is effectively protected, the safety of the circuit is further effectively protected, and the service life of the fuse is prolonged.

Description

technical field [0001] The invention relates to the technical field of resistance, in particular to a resistance fuse protection device with over-temperature protection. Background technique [0002] Insurance resistors are also known as fuse resistors. Insurance resistors have both the functions of resistance and fuse. They are usually only used as resistors. Once the current is too large, they will play the role of fuses to protect machinery and equipment. However, the current fuse resistors The fuse does not have an over-temperature protection device, which causes the fuse resistor to fail, and the normal operation of the fuse resistor cannot be guaranteed. [0003] Because the fuse resistor is exposed to the outside for a long time, the sun often shines on the fuse, which increases the temperature of the fuse, causes the resistance inside the fuse to increase, and makes the fuse resistor work, causing false triggering of the fuse and affecting The normal use of the fuse...

AI Technical Summary

Problems solved by technology

[0002] Insurance resistors are also known as fuse resistors. Insurance resistors have both the functions of resistance and fuse. They are usually only used as resistors. Once the current is too large, they will play the role of fuses to protect machinery and equipment. However, the current fuse resistors The fuse resistor does not have an over-temperature protection device, which causes the fuse resistor to fail, and the normal operation of the fuse resistor cannot be guaranteed

[0003] Because the fuse resistor is exposed to the outside for a long time, the sun often shines on the fuse, which increases the temperature of the fuse, causes the resistance inside the fuse to increase, and makes the fuse resistor work, causing false triggering of the fuse and affecting The normal use of the fuse reduces the practicability of the fuse. At the same time, if the temperature is too high, it will also burden the current in the circuit and seriously affect the safe use of electricity.

Images