20 hp rotary screw air compressor

This 20 hp rotary screw air compressor boasts the following core advantages:

1. It employs a permanent magnet synchronous motor, which offers higher efficiency and power factor compared to traditional asynchronous motors. Efficiency is typically 5%-10% higher, meaning it consumes less electricity and is more energy-efficient for the same air output.

2. It utilizes frequency conversion technology for constant air pressure control. When air consumption changes, the compressor doesn't simply start and stop; instead, it precisely adjusts the motor speed to match actual demand, ensuring stable pressure.

3. It uses a Newmantech refrigerated dryer, which cools the compressed air to a dew point temperature close to 2-3°C, maintaining the dryness of the compressed gas. This is fundamental to preventing lens fogging, avoiding internal corrosion of the cutting head, and ensuring the smooth downward discharge of cutting sparks.

4. A multi-stage precision filter combination effectively filters out dust, oil, and water from the air, ensuring the compressed air is dry, clean, and oil-free. This maximizes the protection of the air compressor and the core components of the laser cutting machine, improving product processing quality.

In the laser cutting industry, air compressors play a crucial role, serving as a core auxiliary system for the efficient and stable operation of the entire equipment. Their functions are primarily reflected in the following key aspects:

1. As Cutting Gas (Auxiliary Gas)

This is the most important and direct function of the air compressor. Compressed air itself is used as an economical and efficient cutting gas, especially when cutting metal materials such as carbon steel, aluminum alloys, and galvanized sheets.

Working Principle: High-pressure airflow is injected into the laser cutting head, working in conjunction with the high-energy laser beam on the material surface.

Blowing Away Molten Slag: Rapidly blows away the molten metal slag melted by the laser, forming a clean and smooth kerf.

Cooling and Protection: Cools the heat-affected zone of the cutting area and protects the focusing lens inside the cutting head from contamination by splashing molten slag or overheating damage.

Participating in the Reaction: Oxygen in the air undergoes a slight exothermic oxidation reaction when in contact with high-temperature metal; this additional heat helps increase the cutting speed of materials such as carbon steel.

2. Significantly Reduced Costs by Replacing Expensive Gases

Compressed air is extremely inexpensive compared to high-purity oxygen (used for cutting thick carbon steel) or nitrogen (used for cutting stainless steel and aluminum alloys to achieve an oxide-free bright finish).

Economical Cutting: For many carbon steel workpieces where the cut surface does not require extreme oxidation (such as parts requiring subsequent painting), using compressed air for cutting can significantly reduce gas costs, making it the most cost-effective choice.

Partial Replacement for Nitrogen Function: While pure nitrogen is most effective when cutting stainless steel and aluminum alloys, using treated, dry, and clean compressed air can also achieve a certain degree of "oxide-free" or "low-oxide" cutting, meeting the needs of many low- to mid-range applications and greatly saving operating expenses.

3. Powering Pneumatic Components
Laser cutting machines themselves contain several pneumatic components:

Cylinders: Used to control the raising and lowering of the cutting head (automatic focusing), the opening and closing of the exchange table, and the opening and closing of the protective door, etc.

Pneumatic Valves: Control the on/off and switching of auxiliary gases.

Fixtures and Positioning Devices: Some tooling fixtures utilize pneumatic clamping.

Air compressors provide a stable and continuous power source for these components, ensuring automated operation of the equipment.

4. Cooling and Cleaning

Equipment Cooling: Cooling systems for some lasers (such as vortex tube coolers) require compressed air.

Optical Lens Cleaning: Used to periodically blow away dust from the surfaces of optical components such as protective lenses and focusing lenses, maintaining a clean optical path.

Air Compressor Selection Considerations

In the laser cutting industry, the following are typically chosen:

Type: Oil-injected screw air compressors are preferred (but a high-efficiency oil filter is essential at the back end) due to their good stability, high air output efficiency, and suitability for continuous operation. While oil-free air compressors are advantageous, their purchase and maintenance costs are extremely high.

Post-processing System: This is crucial for ensuring air quality and typically includes: air receiver → pre-filter → refrigerated dryer → precision filter (for oil and dust removal) → adsorption dryer (if necessary). The investment in this system may be comparable to that of the air compressor itself, but it is indispensable.

Specification Matching: An air compressor with sufficient discharge capacity (m³/min) and pressure (typically 0.8-1.6 MPa) must be selected based on the maximum air consumption (peak flow rate) of the laser cutting machine and the number of simultaneously operating devices.

Product Parameters

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