Time relay (Time Relay) refers to a relay that the output circuit needs to generate a jump -type change (or contact actions) after adding (or removed) input input signals.It is an electrical element that is used to connect or cut off the circuit with higher voltage and larger current on a lower voltage or smaller current.
The role of time relay
Time relays can be divided into two types: general -power delay type and power -off delay type.In terms of the principles of action, there are electronic, mechanical, etc.The electronic formula is to use the capacitor charging and discharge and then the principle of electronic components to achieve delayed action.There are many mechanical styles, with airbags that use airbags and spring.Time relay: When adding or removing the input signal, the output part needs to be delayed or limited to the specified time before closed or disconnected the relay of its controlled line.Used to accurately control a mechanical equipment or component products.
Time relay model
The model name of the general domestic relay consists of four parts: the first part+the second part+the third part+the fourth part.The first part of the relay model uses letters to represent the main type of relay.JR ——Long power relay JZ -medium -power relay JQ —— high -power relay JC — magnetic electrical relay JU —— thermal relay or temperature relay JT — special relay JM — pulse relay JS — time relay — time relay — time relay — time relayJag — dry spring type relay
Time relay symbol
Correct recognition Time Relay graphics symbol 2008-10-2120: 50 Correct recognition Time Relay graphic symbol time Relay relay is a very important component in electrical control systems.It is generally divided into two types: power -powered delay and power -off delay.When drawing and identifying the electrical schematic diagram, the graphic symbol of the time relay is easy to make people mix.Especially the delayed contacts of the time relay are generally unsure when used.The text symbol of the time relay is KT I. The coil graphics of time relay is divided into power -powered delay mobility and power -off delay reset.EssenceFigure 1 Power power delay Figure 2 Power -off delay 2. Time relay contacts graphics symbol Time relay The contact figure symbol is mainly the direction of the opening of the semi -circular symbol of the contact.Direction of delay.As shown in Figure 3, it is a graphic symbol of various contacts that are delayed.
Time relay working principle
Time relay is a control electrical appliance that uses electromagnetic principles or mechanical principles.When the coil is electric, the armed iron and the bracket are attracted by the iron heart and moved down to the moment, causing the instantaneous movement contacts to connect or disconnect.However, the piston rod and lever cannot fall with the toddon at the same time, because the upper end of the piston rod is connected to the rubber membrane in the gas chamber. When the piston rod starts to move downward under the action of release the spring, the rubber film is recessed downwards.The air in the air room becomes thinner and slowly decreases the piston rod.After a certain period of time, the piston rod dropped to a certain position, and the delayed contact movement was driven by leverage to disconnect the dynamic contact contact, and the dynamic contacts were closed.From the coil to the delay contact to complete the action, this time is the delay time of the relay.The length of the delay time can be changed by the screw adjustment of the air pores of the air room.After attracting the circles, the relay is restored by restoring the role of restoration of spring.

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