气囊式蓄能器的结构

我们以气囊式蓄能器为例，先看看它的内部结构吧！

结构超简单，在金属外壳内部，装有一个启闭阀、一个充气阀，一个气囊。 当给气囊充入足够多的高压气体后，气囊会膨胀到使启闭阀关闭的位置，而这个启闭阀的作用就是防止气囊充气后被挤出进油口。

气囊内充入多大的压力为合适？

往气囊里预充气体时，肯定不是往死里充，那到底充多少合适呢？

老外一般认为充气压力保持在系统低压力的60~80%之间较为合适，而国内一般认为充气压力可以保持在系统低压力的90%。不管这个百分比是多少，其目的主要是为了保证当系统处于低工作压力时，气囊与启闭阀之间可以保持一定的安全距离。

而这个安全距离，既可以保证当系统处于低工作压力时，在气囊和启闭阀之间所预留的空间内，能够储存少量的油液；又可以保证当气囊膨胀释放压力时，气囊不会直接撞击启闭阀，从而造成物理损伤。

充气压力太高太低都不行

如果充气压力太低，那么当系统开始工作以后，气囊将直接被液压油挤成了一小团，这样的蓄能器起不到任何作用；而如果充气压力过高，气囊将会挤压启闭阀，此时启闭阀芯的锐边很有可能会切割气囊。

更多液压蓄能器知识，可联系中科欧克液压有限公司！

Structure of air bag accumulator

Let's take the air bag accumulator as an example. Let's take a look at its internal structure first!

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The structure is super simple. Inside the metal shell, there is an on-off valve, an inflation valve and an air bag. When enough high-pressure gas is filled into the air bag, the air bag will expand to the position where the on-off valve is closed, and the function of the on-off valve is to prevent the air bag from being squeezed out of the oil inlet after inflation.

What is the most appropriate pressure to fill the airbag?

When the air bag is pre filled with air, it must not be filled with dead air. How much is appropriate?

Foreigners generally think that it is more appropriate to keep the inflation pressure between 60% and 80% of the minimum pressure of the system, while domestic generally think that the inflation pressure can be kept at 90% of the minimum pressure of the system. No matter what the percentage is, its main purpose is to ensure that when the system is at the lowest working pressure, a certain safety distance can be maintained between the airbag and the on-off valve.

This safety distance can not only ensure that when the system is at the lowest working pressure, a small amount of oil can be stored in the reserved space between the air bag and the on-off valve; but also ensure that when the air bag expands to release pressure, the air bag will not directly impact the on-off valve, causing physical damage.

The inflation pressure is too high or too low

If the inflation pressure is too low, then when the system starts to work, the air bag will be directly squeezed into a small ball by the hydraulic oil, so the accumulator can not play any role; if the inflation pressure is too high, the air bag will squeeze the on-off valve, and the sharp edge of the on-off valve core is likely to cut the air bag.

For more knowledge about hydraulic accumulators, please contact Zhongke Orke Hydraulic Co., Ltd！