Any blockage in all ventilation ducts (paths) from the suction nozzle to the motor exhaust hole will reduce the suction air volume and cause insufficient suction.
The main reasons for the blockage of the air duct: First, the vacuum cleaner inhales large objects. The second is that the dust filter bag is stained with too much dust, too much dust is accumulated in the dust collection chamber, or the dust filter cover is wet, which makes it difficult for the air to circulate.
For the former, the problem can be solved simply by removing the foreign objects in the air duct of the vacuum cleaner. If the latter, first remove the dust from the dust chamber.
Then deal with the dust filter bag. If it is a one-time product, it should be replaced in time; if it is a cloth dust filter bag, it can be eliminated by cleaning the dust filter bag.
That is: first soak the dust filter bag in water for 30 to 60 minutes, then wash it repeatedly, then rinse it with water, and then use it after drying.
Generally, dust filter bags should not be washed with soap, nor should they be placed in a washing machine or scrubbed vigorously by hand, as this will easily de-lint the flannel, and dust will easily penetrate into the motor, which may affect the normal operation of the motor over time, or even cause the motor to be burned out.
2. Due to air leakage in the air duct. This fault is mainly caused by damaged or improper installation of the dust filter cover, rupture of the flexible pipe, and too loose or misplaced connection between the suction nozzle and the pipe.
Different situations can be distinguished by repairing or installing the dust filter cover, or connecting the suction nozzle and the nozzle tightly.
If the flexible pipe is ruptured and causes air leakage, it can be repaired with Black Decker glue or plastic tape. If the damage is serious, it is better to replace it with a new one.
3. The reason for the motor speed. The main reason for the slow speed of the motor is the poor contact between the brushes and the commutator.
During inspection, the resistance at both ends of the motor can be measured by the multimeter R×1 gear, which should be 8-10Ω in normal condition.
If the measured value is much larger than this, it can be judged as poor contact.
If the measured value is too large, or even open circuit, then the motor will not start, not the problem of slow speed.
