Micro Pump rubber diaphragm

描述

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The rubber diaphragms of small pumps are key components in diaphragm pumps. Their core feature lies in achieving leak – free fluid transportation through elastic deformation, while also possessing characteristics such as corrosion resistance and wear resistance. The following is a detailed analysis:

I. Core Features
1. Material Diversity
Common materials for rubber diaphragms include EPDM (Ethylene – Propylene – Diene Monomer), NBR (Nitrile Butadiene Rubber), and fluororubber. For example:
– EPDM: Resistant to weak acids, alkalis, alcohols, and water vapor, with an applicable temperature range of – 40 to 130°C. It is suitable for non – corrosive media such as clean water and sewage.
– NBR: Exhibits excellent oil resistance and is suitable for environments involving engine oil and lubricating oil.
– Fluororubber: Resistant to strong acids, alkalis, and high temperatures, but with a relatively high cost.
2. Structural Design
The diaphragm drives the fluid through reciprocating motion, and the check valve controls the flow direction, enabling self – priming and low – shear transportation to protect the integrity of the fluid (e.g., in the food and pharmaceutical industries).
3. Performance Advantages
– Leak – free: Isolates the fluid from the driving components, making it suitable for toxic and flammable media.
– Pressure and wear resistance: Cloth – inserted diaphragms (e.g., nylon – reinforced) can enhance the impact resistance and extend the service life.

II. Main Applications
1. Industrial Fields
– Chemical industry: Used for transporting acid and alkali solutions and solvents (the material should be selected according to the medium, e.g., PTFE for highly corrosive media).
– Environmental protection: For treating sewage and slurry. EPDM diaphragms are commonly used due to their good water resistance.
2. Special Scenarios
– Food and pharmaceutical industries: The low – shear design ensures that active substances in products such as yogurt and medicinal liquids are not damaged.
– Agricultural irrigation: The self – priming function allows direct pumping of water from a low – lying position without the need for pump priming.

III. Selection Suggestions
1. Medium compatibility: Select PTFE or fluororubber for corrosive media, and NBR for oils.
2. Pressure and temperature: EPDM is suitable for medium – low pressure and normal – temperature environments. Metal composite diaphragms are required for high – temperature and high – pressure conditions.
3. Maintenance cost: Pure rubber diaphragms are easy to replace, while composite diaphragms have a longer service life but a higher price.