1： Drain the circulating water circuit of the water chiller

When the laser equipment is finished or shut down during holidays, we can discharge the water inside the circulating water circuit. When it is necessary to use the cutting equipment, we can add cooling water to the chiller.

Open the drain valve of the chiller and drain the water from the water storage tank After the water in the water tank is drained, there will be residual water in the water pipe or pipeline. First, disassemble the inlet and outlet pipes, and use clean compressed air or nitrogen below 0.3 MPA to blow off the remaining water in the laser, water pump, and cutting head. Make sure there is no water in the pipeline. Otherwise, water droplets on the tube wall may form ice crystals, which may damage the internal components of the laser under the push of water flow.

2： The water in the chiller remains circulating

Under the condition that there is absolutely no power outage in the workshop, the water chiller can be left on at night to keep the water circuit in a circulating state. In order to save energy, the temperature of the optical fiber can be adjusted to about 10 ℃ to ensure that the cooling water does not fall below the freezing point. However, when water flows in extremely cold conditions, it can also freeze, potentially causing equipment damage. (This situation depends on the local environmental impact.).

3： Use antifreeze as coolant

"If there are frequent local power outages or current limited power conditions, it is not possible to maintain water circulation all the time.". Then we can add antifreeze to solve the problem, which can prevent hidden dangers such as the expansion and cracking of the laser, water pump, and cutting head due to the freezing of the coolant during cold winter shutdown.

Quality must be paid attention to when selecting antifreeze. If the quality of antifreeze is not good, it cannot function as an antifreeze. The main advantages and disadvantages of antifreeze are as follows: First, the antifreeze effect. The freezing point of water is 0 ℃. Generally, ordinary antifreeze can reach - 40 ℃, while high-quality antifreeze should reach around - 60 ℃, which is an important indicator for calibrating the quality of antifreeze; The other is the boiling point of antifreeze. The boiling point of water is 100 ℃, while the antifreeze should reach at least 108 ℃ or above. That is, the lower the freezing point, the higher the boiling point, and the greater the temperature difference, the better the quality of the antifreeze. Different brands and types of antifreeze have different production components, so mixing antifreeze is prohibited.

When adding antifreeze, it is also necessary to check whether the antifreeze is compatible with the cutting equipment, operate in strict accordance with the instructions, and check whether it is suitable for the local use environment. Any antifreeze solution cannot replace purified or deionized water and cannot be used for a long time. After winter, the entire circulation pipeline must be cleaned with purified or deionized water, and the use of deionized or purified water as a coolant must be resumed.

IV Precautions for use

After using antifreeze, such as during holidays or long downtime, please drain the entire circulating water circuit according to the first rule: Drain the circulating water circuit of the water chiller.