The vacuum solenoid valve controls the opening and closing by AC or DC power supply, and can use the electromagnetic principle to realize the vacuum treatment of the pipeline. It is mainly used in the vacuum pipeline or the linkage control system with the vacuum pump. It is directly operated by an electromagnet, which controls the opening and closing of the valve to open and close the atmosphere, and is used to fill the vacuum container with the atmosphere to achieve automatic control or remote control. At the same time, electromagnetic control can have a greater impact on the entire working state of the pipeline system, and the use of vacuum solenoid valves can also effectively avoid the impact of other irrelevant factors on the pipeline, so as to correct the working state of the pipeline system Adjustment.
When the vacuum solenoid valve is installed in a mechanical vacuum pump, the valve and the pump are connected to the same power source, and the opening and stopping of the pump directly controls the opening and closing of the valve. When the pump stops working or the power supply is suddenly interrupted, the valve can automatically close the vacuum system and fill the pump cavity with air through the air inlet of the pump to avoid backflow of pump oil and pollute the vacuum system.
The figure shows a schematic diagram of the vacuum solenoid valve structure.
a) In the non-energized state (shown in the left picture above): under the action of rubber membrane I and vacuum pressure, the armature moves up to a high position, and the rubber membrane II is pushed down by a tube of needle. The controlled object (the vacuum chamber of the EGR valve) is in communication with the atmosphere, and the air flow direction is shown by the green line in the left picture. The vacuum passage is blocked, and the controlled object (EGR valve) does not operate (the EGR valve is closed). b) In the energized state (shown in the right picture above): under the action of the magnetic field force, the armature moves down to a low position, the rubber film II is pulled down by the armature, and the controlled object (the vacuum chamber of the EGR valve) ) Is connected to the vacuum source (vacuum pump), the air flow is shown by the green line in the right figure, the air passage is blocked, the vacuum passage is opened, and the controlled object (EGR valve) starts to move (the EGR valve opens).
c) When the working frequency of the vacuum solenoid valve is 300 Hz, the armature of the solenoid valve will move 300 times per second, that is, the air flow of the vacuum passage is on and off 300 times per second.
Phenomenon and common problems of vacuum solenoid valve work 1. Airflow noiseFrom the above working principle, it can be seen that the state (vacuum degree) of the controlled object (the vacuum chamber of the EGR valve) needs to be
When there is a large change, the amount of air entering through the air filter is large at this time, and airflow noise will be generated during the air entering process. Therefore, this kind of noise is the inherent characteristic of this type of vacuum solenoid valve. Elimination, but if the processing precision of the moving parts is high and the assembly precision is improved, the noise of the airflow can be reduced.
2. Issuance of moving parts (armature)â‘ . The armature is stuck at the upper end: When the armature is stuck at the upper end, the vacuum chamber of the EGR valve is not connected to the vacuum source (vacuum pump). As shown in the left picture above, the EGR valve is normally closed. The EGR valve does not work.
â‘¡ The armature is stuck at the lower end: When the armature is stuck at the lower end, the vacuum chamber of the EGR valve is directly connected to the vacuum source (vacuum pump), but not to the atmosphere. As shown in the right figure above, the EGR valve is normally open. This will cause the engine to emit black smoke.
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