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Some related knowledge of finder intermediate relay

文章出处:芬德电子科技 / 作者:芬德电子科技 / 发表时间:2023-04-19

  Finder intermediate relayIt is used for relay protection and automatic control of electrical systems to increase the number and capacity of contacts. It is used to control the transmission of intermediate signals in the circuit. The structure and principle of finder intermediate relay are almost the same as that of AC contactor. The main difference with contactor is that the main contact of contactor can pass through large current, while the contact of finder intermediate relay can only pass through small current. Therefore, it can only be used in the control circuit. It usually has no main contact because the overload capacity is relatively small. Therefore, all auxiliary contacts are used, and the number is relatively large. The new national standard finder intermediate relay is defined as K, and the old national standard is defined as Ka. Generally, it is powered by DC power supply. Use a small amount of AC power.

Finder intermediate relay is a multi-purpose automatic remote control device in relay protection and automatic control system. Finder intermediate relay has good electrical isolation. In order to make the controller and the accused have no electrical connection, so as to achieve the purpose of safety control.

Finder intermediate relay, also known as auxiliary relay, is a relay that outputs or amplifies the output signal by controlling the on-off of electromagnetic coil. Its working principle is basically the same as that of low-voltage contactor.

With the help of it, when the contact or contact capacity of other relays is insufficient, they can expand the number of contacts or increase the contact capacity, and play the role of intermediate conversion (transmission, amplification, overturning, shunting and storage). Finder intermediate relay has many contacts, large contact capacity, and the rated current of each contact is the same.

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It is mainly applicable to the control circuit with AC voltage of 380V and DC voltage of 220V. It is mainly used to transmit multiple signals and control multiple circuits at the same time. It can also directly control small capacity motors or other electric actuators

Combining multiple finder intermediate relays can also form circuits with various logic operation and calculation functions. Because the rated current of the finder intermediate relay contact is much greater than the coil current, it can be used to amplify the signal. Most new finder intermediate relays are installed with clamping rail, which is convenient for installation and disassembly.

In the contact closing process, there is a sliding and rolling process between the dynamic and static contacts, which can effectively remove all kinds of films and dust on the contact surface, reduce the contact resistance and improve the contact.

  structure

1. The coil is installed on the "U" shaped magnet, which has a movable armature, and two rows of contact shrapnel are installed on both sides of the magnet. In the non action state, contact the spring leaf to lift the armature upward to maintain a certain gap between the armature and the magnet. When the electromagnetic torque between the air gaps exceeds the reaction torque, the armature is attracted to the magnet, and the armature presses the contact spring to open the normally closed contact and close the normally open contact to complete the work of the relay. When the electromagnetic torque decreases to a certain value, due to the reaction torque of the contact spring, the contact and armature return to the initial position for the next work

2. The "U" shaped magnet of the relay adopts a double core structure, that is, the coil can be installed on the columns on both sides. For DZY, DZL and dzj models, only one coil is installed, while for dzb, DZS and dzk models, another core can be installed as needed to maintain the delay of the coil or damping plate. Therefore, relays of different coil types have a common conductive magnet

3. The principle of finder intermediate relay is the same as that of AC contactor. The utility model is composed of a fixed iron core, a moving iron core, a spring, a moving contact, a static contact, a coil, a wiring terminal and a shell.