**Technical Standard for Quiet and Oil-Free Air Compressors for Laboratories**
What is a laboratory silent oil-free air compressor?
A laboratory silent oil-free air compressor is specifically designed for use in laboratories, such as colleges, scientific research institutions, and other controlled environments. These compressors are required to deliver high precision, reliability, environmental friendliness, and clean compressed air. Typically, laboratory air compressors with a displacement of less than 1 m³/min are micro-screw reciprocating compressors, also known as silent oil-free air compressors. In some countries, they are referred to as micro-screw swing air compressors.
The working principle involves a motor that drives the crankshaft of the compressor. This motion causes the piston, which is self-lubricated without the need for any external lubricant, to move back and forth through the connecting rod. The cylinder's inner wall, cylinder head, and the top surface of the piston form the working volume, which changes periodically during operation.
As the piston moves away from the cylinder head, the working volume increases, allowing gas to be drawn in through the intake valve. Once the working volume reaches its maximum, the intake valve closes. When the piston moves back toward the cylinder head, the working volume decreases, increasing the pressure inside the cylinder. When this pressure exceeds the exhaust pressure, the exhaust valve opens, releasing the compressed gas. This cycle repeats continuously, with each rotation of the crankshaft resulting in one complete cycle of intake, compression, and exhaust.
The single-shaft, two-cylinder design enhances gas flow efficiency and effectively controls vibration and noise, making these compressors ideal for sensitive laboratory settings.
**Technical Specifications for Laboratory Silent Oil-Free Air Compressors**
- **Higher Gas Output**: This refers to the amount of compressed air produced per unit of power. A higher gas output at the same power level indicates more efficient and environmentally friendly design, better stability, and longer lifespan.
- **Exhaust Pressure**: Industry standards typically set the exhaust pressure at 7 Bar, but many modern models operate at 8 Bar. Some manufacturers, like Ryan Aite, offer adjustable pressure ranges from 0 to 8 Bar, providing greater flexibility for different applications.
- **Air Drying and Cleanliness**: Oil-free technology is used to ensure clean air output. Internal treatment of the air chamber and gas tank, along with advanced filtration systems and oil-water separators, help maintain high air quality. Installing a non-heat regenerative dryer can further ensure dry, moisture-free air. For example, the AITOP brand laboratory air compressor provides:
- Dew point: ≤ -40°C
- Air cleanliness (particles): ≤ 0.05 μm
- Moisture content: ≤ 0.05 ppm
- **Lower Noise Control**: Laboratory air compressors must operate within 60 decibels to ensure a quiet working environment. This is slightly louder than a typical household air conditioner (around 55 dB), but still comfortable for lab staff. Compressors exceeding 60 dB are generally unsuitable for laboratory use due to noise disturbance.
**Domestic Manufacturers of Laboratory Silent Oil-Free Air Compressors**
These low-noise, high-precision compressors were first developed in Europe due to their energy efficiency, ultra-low noise, and oil-free operation. They have been widely adopted in Europe and the U.S. since the early 2000s. In 2002, Ryan Aite Electromechanical introduced the production technology of silent air compressors from Germany and obtained several national invention patents. This helped establish a domestic manufacturing base and reduced reliance on imports.
Today, while many companies claim to produce such compressors, only a few are true manufacturers. Most are assembly-based. Leading manufacturers are primarily located in southern Zhejiang, Guangzhou, and Shenzhen, where they continue to innovate and improve the performance of these essential laboratory tools.
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