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The air damping type time relay has a large delay range (there are two types: .~ and .~). It has a simple structure but low accuracy. .
When the coil is energized (voltage specifications include or, etc.), the armature and the supporting plate are attracted by the iron core and move downward instantaneously, causing the instantaneous action contact to be connected or disconnected. However, the piston rod and the lever cannot fall together with the armature at the same time, because the upper end of the piston rod is connected to the rubber membrane in the air chamber. When the piston rod begins to move downward under the action of the release spring, the rubber membrane will concave downwards, and the upper end of the piston rod will move downwards. The air in the air chamber becomes thinner and the piston rod is damped and slowly descends. After a certain period of time, the piston rod drops to a certain position, and the delay contact action is pushed through the lever, causing the moving contact to open and the moving contact to close. The time from when the coil is energized to when the delay contact completes its action is the delay time of the relay. The length of the delay time can be changed by adjusting the size of the air chamber inlet hole with a screw.
After the attraction coil is powered off, the relay recovers by the action of the recovery spring. The air is quickly exhausted through the air outlet.
Function of intermediate relay
General circuits are often divided into two parts: main circuit and control circuit. Relays are mainly used for control circuits. Contactors are mainly used for main circuits. Through relays, one control signal can be used to control another circuit. Or the function of several signals to complete the control of start, stop, linkage, etc. The main control object is the contactor. The contacts of the contactor are relatively large and have strong carrying capacity. Through it, the control of weak current to strong current is realized. The control object is electrical appliances.
.Replace small contactor
The contacts of the intermediate relay have a certain load capacity. When the load capacity is relatively small, it can be used to replace small contactors, such as the control of electric rolling shutters and some small household appliances. . The advantage of this is that it not only serves the purpose of control, but also saves space and makes the control part of the electrical appliance more refined.
． Increasing the number of contacts
This is the most common use of intermediate relays. For example, in a circuit control system, when the contacts of a contactor need to control multiple contactors or other components, an intermediate relay is added to the line.
． Increase the contact capacity
We know that although the contact capacity of the intermediate relay is not very large, it also has a certain load capacity. At the same time, the current required for its driving is very small, so the intermediate relay can be used to expand the contact capacity. For example, it is generally not possible to directly use the output of inductive switches and transistors to control electrical components with relatively large loads. Instead, an intermediate relay is used in the control circuit, and other loads are controlled through the intermediate relay to expand the control capacity.
． Conversion contact type
In industrial control circuits, situations often occur where the control requires the use of normally closed contacts of the contactor to achieve the control purpose, but the normally closed contacts of the contactor itself have been used up and cannot be used. Complete control tasks. At this time, an intermediate relay can be connected in parallel with the original contactor coil, and the normally closed contact of the intermediate relay can be used to control the corresponding components, and the contact type can be converted to achieve the required control purpose.
． Used as a switch
In some control circuits, intermediate relays are often used to switch on and off some electrical components, and are controlled by the opening and closing of their contacts. For example, in automatic degaussing circuits common in color TVs or monitors, transistors control the intermediate relays. On and off, thereby achieving the function of controlling the on and off of the degaussing coil.
． Conversion voltage
． Eliminate interference in the circuit
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