Plasma Coolant


By their very nature, 火炬数控等离子切割表, 产生大量的热. It clearly takes high temperatures to melt and cut metals cleanly and accurately.

问题是,该切割厚的金属片的热也可以融化等离子炬的电极, 喷嘴, 甚至火炬本身, 如果任其发展. 这就是在等离子体冷却系统开始工作和冷却剂是该系统的一个重要组成部分.

Managing Heat Build-up

Cut-a-way section of plasma torch leads showing copper neutral cable. Coolant absorbs heat as it flows around and past the cable.Power Leads: Ironically, it isn’t the torch itself that generates the most heat in a plasma cutting system. That honor goes to the power leads, which pull a huge amount of electrical current and generate a substantial amount of heat in a relatively small physical space. That heat is absorbed by the coolant that flows around the copper cable on it’s trip through the hoses.

In the photo, at right, we cut through a set of leads near the torch. The blue lead is the chilled coolant (water-in) and red lead is coolant exiting the torch (water-out) flowing back to the radiator/chiller.

The water-in lead is often marked with a green band at the fitting; and water-out lead with a red band.

The plasma torch coolant circulates through some very small spaces, under high pressure, in the cutting torch.电极: Another source of heat is the electrode. 很多当前的需要作为对电极的表面的等离子体弧花朵和热被冷却剂通过电极的背侧循环带走. Without coolant, the electrode itself would quickly melt.


Depending on the design, the coolant may also circulate around the nozzle or the body.

The Cool-Down Process

The cooling system is closed, 不断意味着冷却剂循环通过该系统从受影响的部件拉热.

Plasma cutting system cooling system includes a radiator and fan similar to your auto's cooling system.To remain within a specified temperature range, the coolant, after passing through the torch, 穿过冷却器. The chiller is essentially a radiator that uses refrigerant and a compressor to quickly reduce the temperature of the liquid.

通过散热器之后的等离子体炬冷却剂返回到其出发点, the reservoir, ready for another journey through the system.

Coolant types

等离子系统制造商提供自己品牌的冷却液, although there are also plenty third-party brands available, 其通常由蒸馏 (or de-ionized) water mixed with ethylene glycol or in some cases, propylene glycol.

The distilling and filtering processes remove heavy metals from the water effectively making it less conductive.

The mix ratio of most coolant blends is approximately 3 parts water to 1 part glycol. Freeze protection can vary depending on the blend of ingredients, but can go as low as -25º F. The reason for the having the glycol in the mix is to reduce the freezing point of the water.

  • Do not mix coolant types.
  • 仅使用你的设备制造商规定的等离子体炬冷却液.
  • Don’t repeatedly “top off” the coolant without ever draining and re-filling the system. Draining and refilling the system is the only way to reduce the conductivity of the coolant. This important maintenance should be done at regularly scheduled intervals, as required by your equipment’s preventative maintenance program.

Is More Glycol better?

No. While it’s true that glycol reduces the freezing point in water, making freeze-ups less likely, it turns out that glycol reduces consumable life. In fact, reducing the percentage of glycol can increase consumable life, according to some equipment manufacturers, 到 30%.

We’ve heard that, to increase consumable life, some plasma cutting equipment operators (those in warmer climates) use a lower percentage of glycol. While it’s true that pure water is a great coolant, check the manual and always follow the equipment manufacturer’s recommendation.

检查 5 上述地区上市,让您的PHD®, Hypertherm®, Esab®或飞马特等离子切割枪平稳运行.


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