What is the reason for automatic loading of screw compressor energy level?

Why is it loaded? The load does not meet the requirements. Why does it not meet the requirements? There is something wrong with the cooler. What is the problem? Check it yourself.

"Why does the energy level of the screw ammonia refrigeration compressor used in our factory always load automatically? Moreover, the suction pressure fluctuates greatly, between 0.4~0.7mpa! " Automatic loading is mainly due to the automatic offset of the "slide valve" positioning, which may be due to: 1. The slide valve is not sealed well. 2. The slide valve controls oil leakage. 3. Or malfunction. The inlet pressure fluctuates greatly, mainly due to unstable flow, frequent adjustments, and inaccurate adjustments. Appropriate consideration can be given to increasing the volume of the inlet buffer tank.

Automatic loading should be normal. Our zinc evaporation kiln uses oil-free lubricated piston air compressor, which is designed to: Air compressor - gas storage tank - volatilization kiln (also has a multi-hearth furnace dust collection system). When designing the air compressor, consider whether to automatically identify whether to start based on the local gas storage pressure, and you can also increase the number of air compressors to start. Isn't that what you mean by automatic loading? The main reasons for loading are: (1) System fluctuation, gas consumption increases or decreases ； (2) The air supply of the air compressor and the process gas are not necessarily completely matched (the same). After the gas volume reaches a certain level, it cannot be emptied through the safety valve, otherwise it will waste electricity. ； As for the vibration problem you mentioned, it needs to be comprehensively analyzed, such as pipeline connections, equipment itself, etc.

Personally think: 1. Failure of the valve itself ； 2. Process reasons, such as: In order to ensure a certain export volume, it is caused by insufficient import volume. ； As mentioned on the 2nd floor, ammonia water cooler problem ； Oil line problems can also cause this situation to occur. ； 3. Instrument problems, false signals from the loading valve, and malfunctions ； It is recommended to focus on checking the second point ；

Reply 1# kevinsong Reason for automatic loading of energy levels: First understand the principle of loading and unloading at the screw function level, and adjust the air inlet by moving the slide valve to achieve load increasing and unloading. The movement of the slide valve is controlled by the oil circuit control system through the solenoid valve to move and position the slide valve oil piston in both directions. analyze: 1. The solenoid valve gets a signal to load the compressor, which needs to be checked from the control parameters. ； 2. The oil piston leaks, and the pressure inside the machine pushes the slide valve to load. ； 3. The solenoid valve or other pipe fittings are leaking and cannot be located. Unstable suction pressure is caused by factors such as frequent adjustments and unstable heat input of the refrigerant.

Thank you all, I will wait for the car to be stopped for inspection and maintenance. Business is now good, many customers are queuing up, and the leaders only focus on the output and do not dare to stop the machine!

Please ask Hei Ge: What products do you make?

It should be a control problem. The solenoid valve is unlikely, because the addition and subtraction levels are controlled by a set of solenoid valves, and the solenoid valves are powered on and open.

Reply 8# davidrohn We are doing carbon dioxide purification

This phenomenon is relatively common. Oil leakage from the energy level-adjusted oil piston can cause automatic load increase. Another situation is that the oil pressure is low, and the load may be automatically increased. Because after the compressor is running, there is an unbalanced thrust pushing the piston rod, and the direction of this force is consistent with the direction of the load-increasing force. Another common phenomenon is that it is easy to increase the load, but it is obviously slow or difficult to reduce the load. This is caused by this reason.