The knowledge about the intake valve of the screw air compressor is here
The air compressor intake valve can also be said to be an intake control combination valve, which has functions such as intake control, loading and unloading control, capacity adjustment control, unloading, preventing unloading or shutdown, and fuel injection. Today, let's learn about the working principle of the intake valve of the screw air compressor and the reasons and solutions for the intake valve not opening!
The working principle of the intake valve of the screw air compressor
A general rule for the intake valve of a screw air compressor is: the intake valve is energized and unloaded.
Sometimes our equipment has a slightly larger current when unloaded, and the current is 31A when unloaded at 22KW. It is initially suspected that the intake valve is not closed tightly, because when the air is not used, the pressure will slowly rise after the machine is unloaded, and sometimes a high-pressure alarm will be issued to shut down! Moreover, after the shutdown, there is still some residual pressure inside the machine that cannot be discharged (about 6 kg), which causes the host to be overloaded when restarting.
When the screw air compressor intake valve is a normally open intake valve, the solenoid valve is opened when the screw air compressor is not loaded, and the solenoid valve is closed after the compressor is loaded. When the solenoid valve is opened, there will be a line of gas to close the intake valve, but it cannot be completely closed, and the intake space must be reserved to maintain the minimum pressure required for compressor lubrication. This pressure is generally 1.5bar; the solenoid valve is closed After that, the compressor will enter the normal working state until it reaches the set working pressure, which depends on the user.
The intake valve has two pipes, one is vented; the other is to release the remaining air in the valve to ensure normal loading of the compressor. When unloading, the current is too large, indicating that the tank pressure is high, and the intake valve opening tip is large. Please adjust the vent screw to ensure that the tank pressure is not too high.
After the screw air compressor is stopped, the tank pressure can be completely emptied in about 60 seconds, that is, the pressure is 0, and your tank pressure is still 6bar, indicating that there is a problem with the air intake valve venting pipeline:
Maybe the pipe diameter is too small;
The orifice of the combination valve is too small or whether it is blocked by debris.
After unloading, the pressure will rise slightly back and forth, but this is only needed for balance and the time is very short. It will not rise to high-pressure shutdown. The high-pressure shutdown should be due to a problem with the solenoid valve of the air compressor. Please check whether it is intact and working normally. No matter what kind of intake valve, the tank pressure should be maintained at 1.0~2.0 when unloading. Between BAR. Too high is a great waste of the energy of the screw air compressor.
The reason and solution for the intake valve of screw air compressor not opening
The intake valve of the screw air compressor is a component that controls the air pressure in the air storage tank. Commonly used intake valves have a rotating disc structure and a reciprocating valve plate mechanism. The disc or valve plate is used to open or close the air inlet to control the entry Airflow from the nose.
There are two control methods: one is a switch, when the pressure of the air storage tank reaches the high limit set value, the air inlet is closed, and when the pressure drops to the low limit set value, the air inlet is reopened. The other is that when the air tank reaches a certain pressure, the rotating disc closes the air inlet slightly under the control of the proportional valve. When the pressure of the air tank further increases, the air inlet is further reduced. When the pressure of the air tank When it is slightly reduced, the air inlet will be enlarged to stabilize the pressure within a certain range. When the pressure does not reach the regulated pressure, the intake valve disc is fully opened and the intake port is fully opened.
In the case of operation, what are the reasons for the closing of the intake valve of the screw air compressor? What are the solutions? Let's discuss it briefly!
1. Too much water in the control pipeline, maintain the control pipeline every day.
2, the intake valve works incorrectly; check the cylinder, valve sleeve and other parts, replace if necessary.
3. The air intake valve is stuck; check the intake valve, valve sleeve, or shaft, and replace if necessary.
4. The intake valve spring is broken; replace the spring
5. Solenoid valve failure; Repair or replace as needed, and check the wiring before replacement.
6. The reciprocating valve is damaged; repair or replace.
7. The solenoid valve wire connector is loose; check and tighten the wire terminal.
These will cause the screw air compressor intake valve to malfunction, and it should be handled carefully during production operation. The intake valve is generally a normally closed valve to prevent a large amount of gas from entering the machine head when starting and increase the motor starting current.
There is an intake bypass valve on the intake valve of the screw air compressor, which is used to prevent the formation of a high degree of vacuum in the machine head when the machine is started and no-load, which affects the atomization of lubricating oil.
