Principle of Office Chair Explosion
The principle of office chair explosions is mainly related to design flaws in the pneumatic rod, impure gas composition, and material quality issues.
Impure Gas Composition in Pneumatic Rods
Pneumatic rods are typically filled with nitrogen, an inert gas that is chemically stable and safe, capable of bearing significant weight. Under normal circumstances, the pneumatic rod is sealed, and the chair'sๅ้ (here, it means 'up and down movement') is achieved through changes in air pressure on both sides of the piston inside the cylinder. However, if the gas purity inside the pneumatic rod is insufficient and oxygen or other substances are mixed in, the situation changes. In high-temperature environments or under frequent friction, these mixed gases may undergo chemical reactions, causing a sharp increase in internal air pressure. When the air pressure exceeds the bearing limit of the pneumatic rod, an explosion can occur.
Using Compressed Air Instead of Nitrogen
Some unscrupulous merchants, seeking to make a profit, fill the pneumatic rods with compressed air as a substitute for nitrogen. Compressed air differs from nitrogen in that its composition is complex and contains active gases such as oxygen. Under high-temperature or friction conditions, compressed air is more prone to chemical reactions, leading to a rapid increase in air pressure. Additionally, the stability of compressed air is far inferior to that of nitrogen, making the pneumatic rod more prone to malfunctions during normal use and increasing the risk of explosion.
Inadequate Wall Thickness of Pneumatic Rods
For some chairs that cut corners in production, the wall thickness of the pneumatic rods does not meet standards, which is also a significant cause of explosions. When a person sits on the chair, the air chamber above the piston is compressed, resulting in a substantial increase in air pressure. If the wall thickness of the pneumatic rod is too thin, the pressure exerted on the thinned cylinder wall increases significantly. Under long-term use or sudden force, the cylinder wall may not be able to withstand the enormous pressure and may rupture or explode. Explosions caused by material quality issues like this often have greater destructive power and danger.
