Working principle and function of engine vacuum pump.
The working principle of the engine vacuum pump is to pump the vacuumed container through mechanical, physical, chemical or physicochemical methods to achieve the purpose of obtaining vacuum. Vacuum pump is mainly composed of pump body, rotor, blade, inlet and outlet, etc., through rotation to produce volume changes to discharge the gas out of the pump. During the suction process, the volume of the suction chamber increases, the vacuum degree decreases, and the gas in the container is sucked into the pump chamber. In the exhaust process, the volume becomes smaller, the pressure increases, and the inhaled gas is finally discharged from the pump through the oil seal.
The role of the engine vacuum pump is to produce negative pressure, thereby increasing the braking force. The vacuum pump of the automobile generator is generally a oil pump, that is, the vacuum pump core rotates with the shaft of the generator, and generates negative pressure in the vacuum pump housing, that is, vacuum, through continuous oil absorption and pumping. This negative pressure provides power to the car's braking system, making braking easier. When the vacuum pump is damaged, the power is weakened, the brake will become heavy, the braking effect is reduced, and even failure may occur.
The operating principle of the engine vacuum system also includes the vacuum to generate the brake booster and the vacuum to operate the exhaust gas bypass valve, and the circulating air pressure reducing valve also obtains the vacuum through the electric on-off valve (EUV). Vacuum pump is widely used in metallurgy, chemical industry, food, electronic coatings and other industries, is an important part of the automotive brake system, compared with the pneumatic brake system, the hydraulic brake system needs a resistance system to assist the driver's brake operation.
What is the effect of engine vacuum pump failure
Main effects of engine vacuum pump failure
engine vacuum pump failure will have the following main effects on the car :
brake performance decline : vacuum pump damage will lead to brake effect weakening or complete failure, increase driving safety hazards.
oil leakage : There may be oil leakage at the external connection of the vacuum pump, which is caused by a lax seal or abnormal internal pressure.
brake pedal return problem : slow or no brake pedal return, affecting driving experience and safety.
Engine vacuum pump broken specific performance
Specific manifestations include :
Poor or ineffective brake performance : insufficient braking force during braking, unable to effectively slow down.
Appearance oil leakage : Oil leakage can be seen from the outside at the connection of the vacuum pump.
Slow or no brake pedal return : After releasing the brake pedal, the pedal does not return to its original position in time, or the return process is very slow.
abnormal sound : a distinctly strange sound can be heard when the brake pedal is pressed.
direction deviation or jitter : When braking, the vehicle will appear direction deviation or jitter.
heavy brake pedal : The brake does not feel the help, you need to apply more force to brake.
Engine vacuum pump is broken how to check?
Check whether the car vacuum pump is broken, you can through the following steps :
Check the power connection : Ensure that the power connection of the vacuum pump is correct and is not broken or in poor contact. The vacuum pump cannot work properly if the power cable is broken or in poor contact.
Observe the working state : Pay attention to whether the vacuum pump makes abnormal noise, vibration or high temperature during work. These may be signs of wear or damage to the internal parts, requiring timely replacement with a new vacuum pump .
Check vacuum : after the engine starts, check whether the vacuum indicated by the vacuum gauge is lower than normal. If the value is lower than normal, it may be caused by the vacuum pump failure .
Observe the acceleration performance : during driving, if it is found that the acceleration performance is reduced, it may be because the vacuum pump failure leads to insufficient negative pressure, which affects the normal operation of the engine .
Check the motor and bearings : Check whether the motor is burned out, which may be due to excessive instantaneous current or wear of the motor bearing. If the bearing is damaged, the bearing needs to be replaced; If the motor burns out, repair the motor and rewind the stator coil 2.
Check the rotating disc : pay attention to whether the rotating disc is stuck, which may be due to the deformation of the rotating blade or the resultant force of the spring pressure and centrifugal force is too large. If not repaired, replace the vacuum pump .
Check connections and seals : Make sure that the vacuum pump is connected and sealed properly, and there is no loose or air leakage. Check whether the rubber diaphragm is intact. If it is damaged or aged, replace it .
Check the pipeline : check the intake and outlet pipes are smooth to ensure normal operation .
Check the drive belt : if necessary, check that the drive belt is slack and needs to be adjusted or replaced .
If the preceding steps do not resolve the problem, seek the help of professional technical personnel for a more comprehensive diagnosis and solution .
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