Bellows are a tubular elastic element widely used in industries such as industry, construction, and instrumentation. There are many types of bellows, which are mainly classified according to materials and uses. The following are the main types of bellows and their characteristics:
1. Classification by material
Plastic bellows
Plastic bellows are made of polyethylene (PE), polyvinyl chloride (PVC), polypropylene (PP), etc. as the main raw materials, and have the characteristics of light weight, corrosion resistance, and easy installation. Common types include:
HDPE double-walled corrugated pipe: Made of high-density polyethylene, it has high ring stiffness and is suitable for drainage, sewage and other projects.
PVC double-walled corrugated pipe: Made of polyvinyl chloride, the inner wall is smooth and the outer wall is trapezoidal corrugated, which is suitable for general drainage and ventilation.
PP double-walled corrugated pipe: Made of polypropylene, it has high hardness and high temperature resistance and is suitable for high temperature environments.
Metal bellows
Metal bellows are made of stainless steel, carbon steel, etc., and have the characteristics of high strength, high temperature resistance, and pressure resistance. Common types include:
Stainless steel bellows: Strong corrosion resistance, suitable for chemical industry, aerospace and other fields.
Carbon steel bellows: Low cost, suitable for general industrial environment.
Steel belt reinforced spiral bellows: With steel belt as reinforcement, suitable for large-diameter, high-load municipal engineering.
2. Classification by use
Corrugated expansion joint: Used to compensate for the thermal expansion and contraction of the pipeline due to temperature changes.
Corrugated heat exchange tube: Used in heat exchange equipment to improve heat exchange efficiency.
Diaphragm diaphragm box: Used in pressure measuring instruments to convert pressure into displacement or force.
Metal hose: Used to connect equipment, with flexibility and vibration resistance.
3. Other classification
Single-wall bellows: Simple structure, suitable for general use.
Double-wall bellows: There is a gap between the inner and outer walls, with higher pressure resistance and ring stiffness, suitable for high-load engineering.
Summary: There are many types of bellows, and the selection needs to be based on the specific application scenario, material properties and engineering requirements. For example, plastic bellows are suitable for light loads and corrosive environments, while metal bellows are more suitable for high strength and high temperature environments.