The DBY electric diaphragm pump is a modern and innovative pumping solution that has gained popularity in recent years, especially due to advancements in diaphragm materials. It is now widely used across various industries such as petrochemicals, ceramics, and metallurgy. One of its key advantages is that it doesn't require water for operation, and it can self-prime up to more than 7 meters. It can also handle particles and slurry with a diameter of up to 10 mm without any issues. However, proper operation and maintenance are essential to ensure smooth and efficient performance.
First, when starting or stopping the diaphragm pump, it's important to manage the load carefully. The pump is driven by a variable frequency motor, so sudden changes in load can cause problems. To avoid this, the load should be controlled at around 30% during start-up and shutdown. The process must be gradual, with load adjustments completed within a specific time frame to protect the inverter and extend its lifespan.
Second, the instrument air and lubrication pressure system requires careful attention. The diaphragm pump’s air and oil pressure are interlocked with the main motor. The propelling fluid valve is a gas-closed type, so it must always maintain a certain level of air pressure. The minimum operating pressure for both valves should not be less than 0.4 MPa, which means the instrument air pressure should generally be kept above 0.15 MPa. Even after the pump is stopped, the air supply should not be cut off to prevent liquid from being either too low or too high in the chamber. The air supplied to the valve must be filtered and oil-mist lubricated.
During operation, the lubricating oil pressure must not drop below the interlock value (0.115 MPa), and the pressure difference across the oil filter should remain within acceptable limits. The steel ball in the oil flow sight glass should be at the upper limit, and the flow rate should be adjusted carefully. Large adjustments may cause a sudden drop in pressure, leading to an interlock trip.
By following these operational improvements and mastering the key points, the diaphragm pump can maintain a stable working environment. It has been running continuously for over a year, with only one instance of tripping due to electrical issues, proving its long-term reliability, safety, and efficiency.
**Applications of Diaphragm Pumps**
Thanks to their unique features, pneumatic diaphragm pumps have gradually taken over parts of the market from other types of pumps. For example, they dominate the paint spraying and ceramic industries. In other sectors like environmental protection, wastewater treatment, construction, and fine chemicals, their market share continues to grow, making them irreplaceable in many applications.
Some key advantages include:
1. **Adaptability to Viscous Fluids**: Since they use air as a power source, the flow automatically adjusts based on back pressure, making them ideal for high-viscosity fluids. Centrifugal pumps, on the other hand, need additional equipment like reducers or frequency converters, increasing costs significantly.
2. **Safety in Hazardous Environments**: Pneumatic pumps are safe for use in flammable or explosive environments, such as fuel or chemical transportation. They don’t produce sparks, generate heat, or cause the fluid to overheat, ensuring safer operations.
3. **Handling of Impure Liquids**: In harsh environments like construction sites or industrial waste disposal, where pipelines are prone to clogging, pneumatic diaphragm pumps can pass solid particles and adjust flow. If clogged, the pump will stop automatically until the blockage is cleared.
4. **Portability and Simplicity**: These pumps are compact, easy to move, and do not require a foundation, making them ideal for mobile applications.
5. **Protection of Corrosive Materials**: The pump can completely isolate the material from the external environment, making it suitable for handling hazardous or corrosive substances.
6. **Contamination-Free Operation**: In sensitive processes, diaphragm pumps help prevent contamination of raw materials.
7. **Gentle Handling of Sensitive Fluids**: They are perfect for transporting unstable or delicate materials like photosensitive substances or flocculants, thanks to their low shear force and minimal physical impact.
With all these benefits, diaphragm pumps continue to prove their value in a wide range of industrial applications.
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