Working principle of automatic washing machine.
The washing process of washing machine is mainly to pull dirt into the water under the mechanical action of mechanical drainage and washing, and under the wetting action of detergent, so as to achieve the purpose of washing. First of all, the washing liquid filled between the blades of Apollo wheel is thrown to the barrel wall at high speed under the action of centrifugal force and rises along the barrel wall. In the center of the impeller, because the thrown liquid forms a low pressure area, the washing liquid flow echoes around the impeller. In this way, an eddy current centered on the impeller axis is formed near the impeller. Under the action of eddy current, the clothes make a spiral rotation, are sucked into the center and then thrown to the bucket wall, and rub against the bucket wall. Because the center of the pulsator is a low-pressure area, clothes are easily sucked near the pulsator and constantly rub against the pulsator, just like rubbing clothes manually, and dirt is forced to leave the clothes. Secondly, when clothes are put into the washing liquid, due to the slow inertia movement, there is a speed difference between the water flow and the clothes, which makes them move relatively, and the water flow rubs against the clothes relatively, which also helps the dirt to leave the clothes. Thirdly, due to the irregular shape of the washing surge, when the rotating water hits the barrel wall, its speed and direction change, forming turbulence. Under the action of turbulence, the clothes move irregularly and roll, and their fibers are constantly bent and twisted, and the clothes rub against each other, which increases the effective area of washing and improves the uniformity of washing. According to the invention, the water inlet, the water outlet and the on-off of the motor are controlled through the cooperation of the water level switch and the electromagnetic water inlet valve, so that automatic control is realized. The electromagnetic water inlet valve plays the role of connecting and disconnecting the water source. When the electromagnetic coil is powered off, the moving iron core is tightly pressed on the rubber diaphragm under the action of gravity and spring force, the central hole of the diaphragm is blocked, the valve is closed, and water cannot flow. When the electromagnetic coil is energized, the moving iron core moves upward under the action of magnetic force, leaving the diaphragm and opening the central hole of the diaphragm, so the water above the diaphragm flows into the washing tub through the central hole. Because the circulation capacity of the central hole is greater than that of the holes on both sides of the diaphragm, the pressure above the diaphragm drops rapidly, and the diaphragm will move up under the action of pressure difference, and the door will be closed to release water. The water level switch is actually a pressure switch. As shown in fig. 2, the inlet of the air chamber 1 is connected with the air storage chamber in the washing tub. When water is injected into the washing tub, the air storage chamber is quickly closed. As the water level rises, the water level of the air storage chamber also rises, and the pressure of the enclosed air also increases. The corrugated diaphragm 2 in the water level switch expands under pressure, pushing the ejector pin 3 to move, changing the contact point 4, and realizing automatic on/off. The intelligent fuzzy control automatic washing machine can also automatically judge the water temperature, water level, clothes quality and clothes dirt, and decide the appropriate amount of detergent and the best washing program. When the quantity and texture of clothes in the washing bucket are different, the total weight will be different if water is injected to make them reach the same water level. Taking advantage of this, the quality and quantity of clothes can be judged by measuring the inertia of the washing motor after low-speed rotation. The method is as follows: after a certain amount of water is injected into the washing tub, the motor runs at a low speed, and after it stabilizes, the power is cut off quickly, and the washing tub drives the motor to continue to rotate under the inertia. At this time, the motor winding generates back electromotive force, rectifies its half wave, amplifies and shapes it, and obtains a rectangular pulse sequence. By analyzing the pulse number and pulse width. You can get the quality and quantity of clothes. The dirtiness of clothes is judged by the transparency of water. An infrared photoelectric sensor is added at the drain of the washing barrel, so that the infrared light passes through the water and enters the receiving pipe on the other side. If the transparency of the water is low, the light energy obtained by the receiving tube is small, indicating that the clothes are dirty. Piezoelectric sensors are used for dehydration. When the dehydration barrel is highly rotated, the water sprayed from the dehydration barrel acts on the piezoelectric sensor, and the dehydration operation automatically stops according to this pressure change. /question/ 144 1 18 186 . html
What does the computer board of the washing machine do?
Friend, the function of the computer board of the washing machine is the core part of controlling the washing, drying and drainage of the washing machine, and the operation circuit and protection circuit are also realized by the components in this computer board.