空壓機頻繁加卸載原因及故障分析

部分用戶在使用空壓機的過程中經(jīng)常會遇到空壓機加卸載頻繁這種狀況，而出現(xiàn)這種情況的原因主要有以下幾類：

Some users often encounter frequent loading and unloading of air compressor in the process of using air compressor, and the main reasons for this situation are as follows:

1、供氣壓力和卸載壓力設(shè)定的數(shù)值過于接近

1. The set values of air supply pressure and unloading pressure are too close

當(dāng)空壓機達到供氣壓力時，若用氣量突然減小，變頻器來不及控制電機減速，就會造成產(chǎn)氣量過大，從而造成卸載的情況。

When the air compressor reaches the air supply pressure, if the air consumption suddenly decreases and the frequency converter has no time to control the motor deceleration, it will cause excessive gas production and unloading.

解決方法：將供氣壓力和卸載壓力之間的差值設(shè)的大些，通常差值≥0.05MPa

Solution: set the difference between gas supply pressure and unloading pressure larger, usually the difference is greater than or equal to 0.05Mpa

2、當(dāng)電機恒定頻率運行時，面板顯示壓力上下波動

2. When the motor runs at a constant frequency, the panel shows that the pressure fluctuates up and down

解決方法：換一個壓力傳感器。

Solution: change a pressure sensor.

3、用戶用氣量不穩(wěn)定

3. Unstable gas consumption

用戶用氣量不穩(wěn)定，會突然增加減少很大的用氣量。此時供氣壓力就會出現(xiàn)變動，變頻器控制電機變頻改變輸出氣量來維持供氣壓力穩(wěn)定。但是電機的轉(zhuǎn)速變化都是有速度的，當(dāng)這個速度跟不上用氣端的用氣變化速度時就會造成機器的壓力波動，然后可能會出現(xiàn)加卸載的情況。

The user's gas consumption is unstable, which will suddenly increase and reduce a lot of gas consumption. At this time, the air supply pressure will change, and the frequency converter controls the motor to change the output air volume to maintain the stable air supply pressure. But the change of motor speed has speed. When this speed can't keep up with the change speed of gas end, it will cause the pressure fluctuation of the machine, and then loading and unloading may occur.

解決方法：避免突然使用多臺用氣設(shè)備，可以一臺一臺的開啟用氣的設(shè)備。（2）將變頻器的變頻速度調(diào)快，讓輸出氣量的改變速度增快來適應(yīng)用氣量的變化。（3）用大容量的儲氣罐來緩沖。

Solution: avoid the sudden use of multiple gas equipment, you can turn on the gas equipment one by one. (2) Adjust the frequency conversion speed of frequency converter to make the change speed of output gas increase to adapt to the change of gas consumption. (3) Buffer with a large capacity air tank.

4、用戶用氣量過小

4. The gas consumption of users is too small

通常變頻空壓機的變頻范圍為30%~100%，異步變頻空壓機的變頻范圍為50%~100%。當(dāng)用戶用氣量小于壓縮機下限輸出氣量時，氣量達到設(shè)定的供氣壓力以后，這時候變頻器會控制電機降頻至下限頻率以下限輸出氣量來輸出壓縮氣體，但是因為用氣量太小，供氣壓力就會繼續(xù)升高，直到卸載壓力，機器卸載。然后供氣壓力下降，壓力下降至低于加載壓力時，機器重新加載。

Generally, the frequency range of variable frequency air compressor is 30% ~ 100%, and the frequency range of asynchronous variable frequency air compressor is 50% ~ 100%. When the user's gas consumption is less than the lower limit output gas of the compressor, and the gas volume reaches the set gas supply pressure, the frequency converter will control the motor to reduce the frequency below the lower limit frequency and limit the output gas volume to output compressed gas. However, because the gas consumption is too small, the gas supply pressure will continue to rise until the unloading pressure and the machine unloading. Then the air supply pressure drops, and when the pressure drops below the loading pressure, the machine reloads.

對這種情況做一個分析。就是當(dāng)用氣量很小機器卸載時，該不該讓壓縮機進入休眠狀態(tài)，或者說卸載多少時間以后再進入休眠狀態(tài)。當(dāng)機器卸載時，用氣端也是在用氣的，但是一旦壓縮機進入休眠狀態(tài)以后，壓縮機不在產(chǎn)生用氣，這時候供氣壓力會下降，下降至加載壓力后，機器加載。

Make an analysis of this situation. That is, when the gas consumption is very small, when the machine is unloaded, should the compressor enter the sleep state, or how much time after unloading to enter the sleep state. When the machine is unloaded, the gas end is also using gas, but once the compressor enters the sleep state, the compressor will no longer produce gas. At this time, the gas supply pressure will drop. When it drops to the loading pressure, the machine will load.

這里會出現(xiàn)一種情況，就是當(dāng)機器從休眠狀態(tài)開始重新啟動時，用戶的壓力還在下降，很可能會出現(xiàn)供氣壓力低于加載壓力，甚至遠低于加載壓力的情況，造成供氣壓力過低或者供氣壓力波動大的情形。所以建議卸載后進入休眠狀態(tài)的時間不宜過短。

There will be a situation here, that is, when the machine starts to restart from the sleep state, the user's pressure is still falling. It is very likely that the air supply pressure is lower than the loading pressure, or even far lower than the loading pressure, resulting in the situation that the air supply pressure is too low or the air supply pressure fluctuates greatly. Therefore, it is suggested that the time to enter the sleep state after unloading should not be too short.