**Technical Standard for Quiet and Oil-Free Air Compressors for Laboratories**
What is a laboratory silent airless air compressor?
A laboratory silent oil-free air compressor is specifically designed for use in laboratories, such as colleges and research institutions. These compressors are required to be precise, reliable, environmentally friendly, and capable of delivering clean air. Typically, lab 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 driving the crankshaft of the compressor. The piston, which is self-lubricated without any added lubricant, moves back and forth through the connecting rod. This movement occurs within the cylinder, which is formed by the inner wall of the cylinder, the cylinder head, and the top surface of the piston. As the piston moves from the cylinder head, the working volume increases, allowing gas to enter through the intake valve. Once the working volume reaches its maximum, the intake valve closes.
As the piston moves in the opposite direction, 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, completing one full working cycle per rotation of the crankshaft. A single-shaft, two-cylinder design helps increase the gas flow and effectively control vibration and noise.
**Technical Indicators for Laboratory Silent Oil-Free Air Compressors**
**Higher Gas Production**: This refers to the amount of compressed air produced per unit of power. It's a crucial indicator for users to consider when selecting a compressor. Higher gas production at the same power level indicates a more efficient and environmentally friendly design, with better stability and durability.
**Exhaust Pressure**: Industry standards typically require 7 Bar, though many modern compressors operate at 8 Bar. Some manufacturers, like Ryan Aite, can adjust the pressure between 0 and 8 Bar, offering greater flexibility.
**Air Drying and Cleanliness**: Oil-free lubrication technology, combined with internal treatment of the air chamber and gas tank, along with high-quality air filters and oil-water separators, ensures clean and dry air output. Installing a non-heat regenerative dryer can further enhance air dryness. For example, AITOP brand compressors can achieve a dew point of ≤ -40°C or even ≤ -70°C, with particle size ≤ 0.05 μm and moisture content ≤ 0.05 ppm.
**Lower Noise Control**: Laboratory environments require quiet operation. Most compressors should operate below 60 decibels, similar to a household air conditioner (around 55 dB). Compressors exceeding 60 dB may cause discomfort and are unsuitable for lab settings.
**Domestic Manufacturers of Laboratory Silent Oil-Free Air Compressors**: Initially developed in Europe, these compressors are known for their environmental friendliness, energy efficiency, ultra-low noise, and clean air output. In 2002, Ryan Aite Electromechanical introduced German technology and obtained several national invention patents, leading to domestic production. While many companies now exist, only a few can manufacture them independently. Most are located in southern Zhejiang, Guangzhou, and Shenzhen.
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