Direct-acting type direct-current relay with movable contact spring

Abstract

The invention discloses a direct-acting type direct-current relay with a movable contact spring. The direct-acting type direct-current relay comprises a movable assembly formed by assembling a push rod, the movable contact spring and a movable iron core together. The movable assembly further comprises a limiting part and a contact pressure spring, and the movable contact spring is movably connected to the top of the push rod in a sleeving mode through the limiting part and the contact pressure spring so that overtravel can be achieved through the contact pressure spring. The movable iron core is provided with an iron core hole into which the push rod can be inserted, the bottom end of the pushing rod integrally extends towards the side edge to be provided with a protruding edge which is formed through rotation, the overall dimension of the protruding edge is larger than that of an iron core hole of the movable iron core, the pushing rod is inserted into the iron core hole of the movable iron core from bottom to top, and the protruding edge of the pushing rod is correspondingly matched with the lower hole edge of the iron core hole of the movable iron core. Therefore, when the movable iron core moves downwards, the push rod can be driven to move downwards. According to the invention, the disadvantage of product failure caused by breakage of the snap spring can be avoided.

Description

technical field [0001] The invention relates to a DC relay, in particular to a moving reed direct-acting DC relay. Background technique [0002] An existing DC relay adopts a moving reed direct-acting structure, and its contact part adopts two static contacts and a moving reed. The two static contacts are usually installed on the top of the casing, and the two static contacts The bottom end of the head extends into the casing, and the moving reed is direct-acting and distributed in the casing. The two ends of the moving reed are respectively matched with the two static contacts. When two static contacts are in contact, the current flows in from one of the static contacts, and flows out from the other static contact after passing through the moving reed; the moving reed is installed on one end of the push rod part, and the other end of the push rod part is It is connected with the moving iron core of the magnetic circuit part. When the coil receives current to make the push ...

AI Technical Summary

Problems solved by technology

For DC relays with this structure, on the one hand, the moving iron core and the push rod are fixed by the lower clip spring. During the release process of the relay, due to the spring reaction force and the gravity of the push rod assembly itself, the lower clip spring is prone to breakage. , resulting in failure of the product; on the other hand, the upper circlip is limited by the upper circlip between the moving reed and the push rod. When it is released, the upper circlip will be impacted, and the upper circlip will also break, resulting in product failure; the specific phenomenon is : After the relay is fully engaged, the distance from the lower surface of the upper circlip to the upper surface of the moving reed is the distance of the overtravel, that is, the gap in the moving assembly that is the same as the distance of the overtravel appears on the lower surface of the upper circlip and the moving reed between the surfaces, wherein the moving assembly includes a push rod 101 assembled together, an upper circlip 102, a lower circlip 103, a moving reed 104 and a moving iron core 105. When the coil is powered off, the two springs (contact pressure spring and reaction force spring) the sum of the work done by the reaction force at the overtravel distance and the work done by the gravitational force of the circlip, push rod and moving iron core under the overtravel distance is converted into the kinetic energy of the push rod and upper circlip , when the lower surface of the upper circlip is in contact with the upper surface of the movable reed, the energy impacts on the upper circlip, and the upper circlip may break

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