With the continuous development of science and technology, vacuum technology has been widely used in various fields. In high-altitude areas, it is notably used in scientific research, aerospace, electronics industry, and other fields. In the field of CNC, the vacuum pump seems to be an important auxiliary equipment for CNC routers because this type of equipment is usually equipped with a vacuum adsorption bed to hold the material down on it.
Some users may operate their cnc machines at high altitudes, and they have concerns about the safety and functionality of vacuum pumps in these conditions. Since the air is relatively thinner at high altitudes compared to sea level, can the CNC vacuum pump function properly in such places? In this blog, let's dive into it.
Let's first understand some basic knowledge and concepts.
A vacuum pump is a device designed to remove gas or air from a closed container or confined space. It operates by using mechanical, physical, or chemical methods to create a negative pressure environment, effectively achieving a vacuum state.
The vacuum adsorption system consists of a vacuum pump, a hose, and a vacuum bed. The material to be milled is placed on the bed, and the bottom of the table is connected to the vacuum pump through a hose. A closed cavity is formed between the material and the table.
When the vacuum pump is activated, it removes the air from the cavity, creating a negative pressure environment that securely holds the material on the table.
Let's get back to the topic：
The pumping speed and final vacuum level of a vacuum pump are influenced by its type, power, design, and operating conditions. So, in principle, at high altitudes, the air pressure is low, and the air is thin, which does affect the efficiency of the vacuum pump. Since these pumps extract gas, the reduced gas density at high altitudes can lead to a slower pumping speed. This, in turn, affects both the vacuum level and the gas flow.
Due to the different designs and use conditions of vacuum pumps, different types have different adaptability to high altitude areas. For example, turboturbomolecular pumps and diffusion pumps are less suitable for high-altitude environments.
A turbomolecular vacuum pump is a vacuum pump that uses a high-speed rotating rotor to transfer energy to gas molecules to compress and exhaust them.
A diffusion pump is a type of jet vacuum pump that utilizes a low-pressure, high-speed vapor flow—either oil or mercury vapor—as its working medium. The gas molecules diffuse into the vapor jet and are sent to the outlet. The density of gas molecules in the jet is always low, and this pump is suitable for working in a molecular flow state.
Rotary vane vacuum pumps and dry vacuum pumps (oil free vacuum pumps) are more adaptable.
A rotary vane vacuum pump operates by rotating a piston inside the pump chamber to inhale, compress, and exhaust gas.
A dry vacuum pump, also known as an oil-free pump, is a variable displacement vacuum pump that does not use oil (or liquid) seals.
EagleTec CNC equips our cnc router machines with dry rotary vane vacuum pumps, minimizing the impact of high altitude on their performance.
If you are running your CNC machine at high altitudes, be sure to choose the appropriate vacuum pump type and use conditions according to the actual situation to ensure the stability and reliability of air flow and vacuum.
When operating a vacuum pump at high altitudes, it is important to focus on its maintenance and care. Clean the pump body regularly, and replace the carbon vanes in time so the pump operates normally.
Using a vacuum pump at high altitudes may affect air flow and vacuum, though this is not always the case. Choosing the right type of vacuum pump and its operating conditions, along with regular maintenance, can ensure stable and reliable gas flow and vacuum performance. In actual applications, it is necessary to select and adjust according to the specific situation to achieve the best practice.
If you are looking for a good CNC router with vacuum table, please contact EagleTec CNC. We also provide carbon vanes for vacuum pumps.
A: Yes, there is. It's just that usually the power of this type of vacuum pump is not too high.
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