1 The main introduction of its working principle and maintenance, in order to achieve the role of bypass.
Structure and principle of range hood The range hood is mainly composed of exhaust pipe box check valve motor centrifugal type wind impeller lighting key switch hood and oil collecting box. The electric appliance is equipped with a lighting lamp, and the panel is provided with components such as a key switch and a capacitor. The automatic monitoring type range hood is to add an automatic monitoring circuit to the circuit of the ordinary range hood. In addition to the above-mentioned components, a gas sensor is also installed. When using, just press the automatic gear switch, when the concentration of smoke or various combustible gases and harmful gas in the room exceeds the standard, the range hood will automatically start to discharge these harmful gases outside, when the indoor smoke and harmful When the gas concentration is reduced to a certain level, the hood will automatically stop and resume the monitoring state.
After the power is turned on, the motor rotates to drive the centrifugal wind impeller to rotate at a speed of about 1300 rpm. At this time, the air pressure in the two intake ports of the range hood is greater than the air pressure outside the exhaust port, and the air in the exhaust port Flow outside the exhaust port. The air polluted by the oil smoke continuously enters the pipe of the soot from the air inlet, and then under the action of the centrifugal wind impeller, the oil mist in the oil smoke is thrown on the inner wall of the pipe, and then flows down the pipe wall, and leaks from the pipe wall. The oil port enters the oil collecting box and the remaining gas is taken out from the exhaust port into the exhaust pipe, thereby purifying the air in the financial house. 2 is the automatic range hood circuit, the circuit is added to the automatic hood circuit on the automatic monitoring circuit, it can use the left and right manual button to turn on the power to make the range hood start work, or press the automatic open key to make the gas sensitive The sensor works. In the automatic gear is the left and right air ducts start work at the same time, the power supply lead of each air duct motor in the circuit is connected with a temperature insurance thermal protection; 3 is a non-contact electronic switch automatic range hood circuit, its control circuit all The electronic circuit is used to replace the key switch with a thyristor as a contactless switch to control the start and stop of the motor, and the illumination lamp is also controlled by the non-contact switch.
The common cause of the range hood, and the open circuit fault of the main circuit of the repair, the power cord or the joint is unwelded; whether the key switch is damaged or the contact is bad; the internal winding of the stator winding or the split capacitor is broken. If the line or switch is disconnected, the contact failure should be repaired. If it cannot be repaired, it should be replaced. If the stator winding is broken, it should be re-wound, and the internal open circuit of the capacitor can only be replaced.
If the mechanical rotation part is faulty, the bearing is damaged and the shaft is stuck; whether the shaft is too tight with the bearing. Replaceable bearings or oil can be reassembled for flexible rotation.
Automatic monitoring failure, can not start working gas head dirty, reduced sensitivity, resulting in monitoring failure. The gas sensor head and its mesh cover should be cleaned.
The connecting wire between the monitoring circuit and the gas-sensitive head is detached, so that the signal output from the gas-sensitive head cannot be transmitted to the monitoring circuit, thereby causing the monitoring to malfunction.
The monitoring circuit is faulty, such as the execution of the relay coil or contact damage, unable to operate, the voltage regulator integrated circuit, the power transformer or the rectifying and filtering components are damaged, the integrated operational amplifier drive tube sensitive potentiometer and the gas sensitive head are damaged carefully, find the above components and replace Just fine.
The motor is seriously heated during operation. 2 Oil-bearing bearings are seriously deficient in oil and poorly lubricated. Appropriate amount of oil should be added, if the bearing is damaged, it should be replaced.
The power cord, the insulation of the motor winding is damaged and touches the outer casing, and the damaged part is wrapped with black rubber tape to replace the damaged part or replace the new line and the new winding.
If the components are damp, if the exhaust pipe is not properly installed, it should be reinstalled. The exit should be kept slightly bent to prevent rainwater from flowing into the range hood during the rainy season.
If the component is too oily, the insulation will be reduced. The oil should be cleaned and dried thoroughly.
Example of maintenance of the range hood Example 1 The side of the side of the ordinary range hood does not turn, and the right side of the blade is operating normally.
Therefore, according to the phenomenon, the fault is in the left motor circuit, the circuit is similar to the one, and the fan blade is moved by hand, and the operation is free, indicating that there is no mechanical failure, and the electrical components of the left blade motor are only 10, The power switch is good, the power lines on both sides are reversed, and the left motor is still not running. This shows that the external circuit is normal, which proves that the left motor is damaged. After replacing the new motor, the fault is eliminated.
Example 2 boss brand cooker hood left motor key switch pressed, the blade does not turn.
Therefore, the maintenance cuts off the power supply and removes the outer casing. With the universal RlO, the key switch of the left motor is checked, and it is found that the two-contact circuit is not connected after the key switch is pressed, and the resistance is. Remove the key switch and find that the contacts are severely worn. Replace the new contact switch of the same specification and troubleshoot.
Example 3 After the Taihaohua brand range hood was energized, the right motor hummed and could not start running.
Therefore, after the power is turned on, the motor does not turn, which may be a mechanical failure, so that the starting resistance is increased, or the motor winding disconnection phase-separating capacitor is deteriorated, so that the starting torque is reduced, the outer casing is removed, and the universal RlO, gear, motor and The phase separation capacitors are normal and the blades are turned by hand. The wind blade was found to be tight; after careful inspection, it was found that there was a lot of oil on the rotor shaft and the bearing. Clean the bearing and the shaft with gas oil. After drying, add a proper amount of oil and turn it by hand until it is free to rotate.
Mobile phone, 1 é‚è…½ é‚è…½ 雇 瘫 瘫 韩 韩 æ·‘ Han Shugang Xie Jingjun Ye Lu Jinghai Lutong mobile phone fast charger uses switching power supply circuit, adapt to a wide voltage range. It uses integrated circuit to control charge and discharge, has full-function charge and discharge finger, fast charging speed, automatic shutdown after full charge, mediation only gray can be applied to various types of mobile phones, and can continue to recharge, 1 is the circuit according to the real drawing .
Working principle circuit, 1 is the power switch tube, which is the starting resistor, and 1 is the oscillation feedback network, and its time constant determines 1 conduction time. The rectification and filtering circuit composed of 602 obtains the error control voltage. When the output voltage rises, the sampling voltage makes 0 hip 1 turn on, and 1 turns off early, thereby stabilizing the output voltage. 2 is an overcurrent protection tube, 305 is at the end of 1 and 1 discharge provides a path.
The power part adopts switching power supply, 004 forms the bridge rectifier mobile phone fast charger circuit principle. The switching power supply output pulse is rectified by 08, and the filter obtains about 14 DC voltage. At this time, the power supply refers to the light. The external power input terminal can be connected to the 1014 DC power supply to charge the mobile phone. 14 DC voltage supply pin as power supply, 10,324 is an operational amplifier with a voltage comparator, its internal structure box 2.
Put the mobile phone on the charging output socket, first press the discharge micro switch 3 Jia, then 5 is on, 4 is on. Discharge finger light, 15 lights, mobile phone battery through MwPiii.a 4 magic 3 discharge, discharge, 6 conduction, so that the buckle, the foot level is lower than the foot level, the foot output high level ç“’ 3 cutoff. The pin level is higher than 2, 24 frames, the pin level is high, the pin output is low, the pin level is higher than the pin level, the 1 pin output is low level, and the charging means the FUL lamp is off. The pin level is at the level of the foot, the pin outputs a low level, and the charging finger 01 is off.
When the battery of the mobile phone is discharged to a voltage lower than 3, 5 is cut off, so that 4 is cut off, 6 is cut off, and 013 is off. 1, the foot level rises, so that the foot outputs low level, 3 turns on, 03 output voltage passes, 309 charges the mobile phone, 1 foot output level,
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