| [Visitor (112.0.*.*)]answers [Chinese ] | Time :2022-06-12 |  State 4 reasons why Bakolz relays operate
Power direction relay
When the input amount (such as voltage, current, temperature, etc.) reaches a specified value, the electrical appliance that turns the controlled output circuit on or off. It can be divided into two categories: relays of electrical quantity (such as current, voltage, frequency, power, etc.) and relays of non-electrical quantity (such as temperature, pressure, speed, etc.). It has the advantages of fast action, stable work, long service life and small size. Widely used in power protection, automation, motion, remote control, measurement and communication and other devices. [1]
Electromagnetic relays
Electromagnetic relays are generally composed of iron cores, coils, armatures, contact reeds, etc. As long as a certain voltage is added to both ends of the coil, a certain current will flow through the coil, resulting in an electromagnetic effect, and the armature will overcome the pull of the return spring to the core under the action of electromagnetic force attraction, thereby driving the moving contact of the armature and the static contact (normally open contact) to absorb. When the coil is de-energized, the electromagnetic suction force also disappears, and the armature will return to its original position in the reaction force of the spring, so that the moving contact and the original static contact (normally closed contact) are released. In this way, it is suctioned and released, so as to achieve the purpose of conduction and cutting off in the circuit.For the "normally open, normally closed" contacts of the relay, it can be distinguished in this way: the static contact that is in the disconnected state when the relay coil is not energized, called the "normally open contact"; The static contact in the on state is called the "normally closed contact". The relay generally has two strands of circuit, which are low-voltage control circuits and high-voltage working circuits...
Solid State Relay (SSR)
A solid-state relay is a four-terminal device with two terminals as the input and two other terminals as the output, and an isolation device is used in the middle to achieve galvanic isolation of the input and output.
Solid state relays can be divided into AC type and DC type according to the load power type. According to the switching type, it can be divided into normally open type and normally closed type. According to the isolation type, it can be divided into hybrid type, transformer isolation type and photoelectric isolation type, with photoelectric isolation type being the most.
Solid state relays for solid state relays can have short circuit protection, overload protection and overtemperature protection functions, and combined logic curing packages can realize the intelligent modules required by users, directly used in control systems.Solid state relays are currently widely used in computer peripheral interface equipment, constant temperature systems, temperature regulation, electric furnace heating control, motor control, CNC machinery, remote control systems, industrial automation devices; Signal lights, dimming, flashers, lighting stage lighting control systems; Instrumentation, medical equipment, copiers, automatic washing machines; Automatic fire protection, security systems, and power capacitor switch as compensation for power factors in the power grid, etc., in addition to chemical, coal mines and other explosion-proof, moisture-proof, corrosion-proof occasions have a large number of uses...
Thermal reed relays
Thermal reed relay is a new type of thermal switch that uses thermal magnetic materials to detect and control temperature. It is composed of a temperature-sensitive magnetic ring, a constant magnetic ring, a reed tube, a thermally conductive mounting piece, a plastic substrate and other accessories. Thermal reed relays do not use coil excitation, but the magnetic force generated by the constant magnetic ring drives the switching action. Whether the constant magnetic ring can provide magnetic force to the reed is determined by the temperature control characteristics of the temperature-sensitive magnetic ring.
Reed relays
The reed relay is a relay that uses a coil to generate a magnetic field to act on the reed tube, which is a coil sensing device. Therefore, the characteristics of the reed relay, small size, light weight, fast reaction speed, short runout time and so on.
When the entire ferromagnetic metal or other magnetic material is close to it, an action occurs and the circuit is opened or closed. Consists of a permanent magnet and a reed. Permanent magnets and reeds are fixed to a bracket that is neither magnetic nor magnetic. With the polar axis of the permanent magnet as the axis, this axis should coincide with the axis of the reed or substantially coincide. Adjust the distance between the permanent magnet and the reed pipe from far and near, when the reed pipe just happens to move (for the normally open reed, it becomes closed; For normally closed reeds, change to disconnected), fix the position of the magnet.At this time, when there is a whole piece of magnetic conductive material, such as an iron plate close to the magnet and the reed at the same time, the reed tube will move again and return to the state when there is no magnetic field action; When the iron plate leaves, the reed pipe moves in the opposite direction. The reed relay has a strong structure, the contacts are sealed, the durability is high, and it can be used as a position restriction switch for mechanical equipment, and can also be used to detect whether iron doors, windows, etc. are in a specified position...
Photorecepies
Photorearies are semiconductor relays used in AC/DC, which refers to devices that integrate light-emitting devices and receiving devices. The input and output sides are electrically insulated, but the signal can be transmitted through an optical signal.
It is characterized by semi-permanent life, small current drive signal, high impedance insulation withstand voltage, ultra-small, optical transmission, no contact... Wait.
Mainly used in measurement equipment, communication equipment, security equipment, medical equipment... Wait.
Time relays
A time relay is a control appliance that uses electromagnetic principles or mechanical principles to achieve delayed control. There are many types of it, including air-damped, electric and electronic.
In the AC circuit, air damping type time relays are often used, which use the principle of air throttling through small holes to obtain time-delayed action. It consists of three parts: electromagnetic system, time delay mechanism and contact.
Time relays can be divided into two types: power-on delay type and power-off delay type.
The air-damped time relay has a large delay range (0.4~60s and 0.4~180s), which has a simple structure but low accuracy.
When the coil is energized (voltage specifications are ac380v, ac220v or dc220v, dc24v, etc.), the armature and the pallet are attracted by the iron core and instantly moved down, so that the instantaneous action contact is connected or disconnected. However, the piston rod and the lever cannot fall with the armature at the same time, because the upper end of the piston rod is connected to the rubber film in the air chamber, and when the piston rod begins to move downward under the action of the release spring, the rubber film is concave downwards, and the air in the upper air chamber becomes thinner and the piston rod is damped and slowly declines. After a certain period of time, the piston rod descends to a certain position, and the delayed contact action is pushed through the lever, so that the moving contact is disconnected and the moving and closing contact is closed. From the time the coil is energized to the time the delay contact completes the action, this is the delay time of the relay.The length of the delay time can be changed by screwing the size of the air chamber air intake...
After the suction coil is de-energized, the relay relies on the action of the recovery spring to recover. Air is rapidly discharged through the vents. |
|
