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Related knowledge of screw air compressor intake valve

时间:2019-12-03| 作者:admin

The air compressor inlet valve can also be said to be an intake control combination valve, which has the functions of air intake control, loading and unloading control, volume control, discharge, preventing unloading or stopping the fuel and so on. Today, let's take a look at the working principle of the intake valve of the screw air compressor and the reasons and solutions for the opening of the intake valve.

工作 Working principle of screw air compressor inlet valve A general rule for the screw air compressor inlet valve is: the inlet valve is powered on and unloaded.

Sometimes, when our equipment is unloaded, the current will be slightly larger, and the current will be 31A when unloaded at 22KW. It is initially suspected that the air inlet valve is not closed tightly, because when the gas is not used, the pressure will gradually rise after the machine is unloaded, and sometimes the high-pressure alarm will shut down! And after the shutdown, there is still some residual pressure inside the machine that cannot be discharged ( (About 6 kg), causing the host to overload when it restarts.

When the screw air compressor intake valve is a normally open type, the solenoid valve is open 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 gas to close the intake valve, but it cannot be completely closed. The intake space must be reserved to maintain the minimum pressure required for compressor lubrication. This pressure is generally 1.5 bar; 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.

进 气 The intake valve has two pipes, one is vented; the other is to let off the remaining gas in the valve to ensure the compressor is normally loaded. When unloading, the current is too large, which indicates that the tank pressure is high and the opening of the intake valve is large. Please adjust the venting screw to ensure that the tank pressure is not too high.

After the screw air compressor is stopped, the tank pressure can be completely drained in about 60 seconds, that is, the pressure is 0, and your tank pressure is still 6 bar, indicating that there is a problem with the air inlet valve venting pipeline:

The diameter of the pipeline may be too small;

The combination valve orifice is too small or there is no obstruction.

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 a problem with the solenoid valve of the air compressor. Please check whether it is intact and whether it can work 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 a waste of energy for screw air compressors.

Reasons and Solutions for Screw Air Compressor Inlet Valves Cannot be Opened The screw air compressor intake valve is a component that controls the air pressure in the air tank. Commonly used air intake valves include a rotating disc structure and a reciprocating valve plate mechanism. Use a disc or valve plate to open or close the air inlet to control the air flow into the head.

There are two control methods: one is the switch, when the pressure of the gas storage tank reaches the high limit set value, the air inlet is closed; when the pressure drops to the low limit set value, the air inlet is reopened. The other is that when the gas storage tank reaches a certain pressure, the rotating disc is slightly closed under the control of the proportional valve. When the pressure of the gas storage tank is further increased, the air inlet is further reduced. With a slight decrease, the air inlet will be enlarged to stabilize the pressure within a certain range. When the pressure does not reach the capacity adjustment pressure, the inlet valve disc is fully opened, and the air inlet is completely opened.

Under the condition of operation, what are the reasons for the closing of the intake valve of the screw air compressor, and what are the solutions? Let's briefly discuss it!

1. There is too much water in the control pipeline. Maintain the control pipeline daily.

2, the intake valve is working incorrectly; check the cylinder, valve sleeve and other parts, and replace if necessary.

3. The air intake valve is stuck; check the intake valve, valve sleeve, or shaft, and replace if necessary.

4, the spring of the intake valve is broken; replace the spring

5. Solenoid valve failure; Repair or replace as required. Check the wiring before replacement.

6. Shuttle valve is damaged; repair or replace.

7. The solenoid valve wire connector is loose; check and tighten the wire terminal.

These will cause the intake valve of the screw air compressor to malfunction, which should be handled with care during production operation. The intake valve is normally closed, which prevents a large amount of gas from entering the machine head during startup and increases the motor starting current.

Screw air compressor has an intake bypass valve on the intake valve to prevent the machine from starting and no-load, a high vacuum is formed in the head, which affects the atomization of the lubricant.

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