A circulating water vacuum pump is commonly referred to as a water ring vacuum pump. This type of pump is widely used in laboratories and industrial settings for processes requiring negative pressure, such as evaporation, distillation, and filtration. It operates without oil, making it clean and low-maintenance, with advantages like compact design, stable performance, and the ability to recycle water. Key selection factors include flow rate, power, and lift height to ensure it meets specific operational needs.
Key Points Explained:
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Alternative Name:
- The circulating water vacuum pump is also known as a water ring vacuum pump. This name comes from its operating mechanism, where a rotating impeller creates a water ring that seals and compresses gases to generate vacuum pressure.
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Primary Applications:
- Used in universities, research labs, and industries (chemical, pharmaceutical, food, etc.) for:
- Evaporation & distillation
- Crystallization & drying
- Vacuum filtration & degassing
- Ideal for small-scale operations due to its noise reduction, oil-free operation, and environmental safety.
- Used in universities, research labs, and industries (chemical, pharmaceutical, food, etc.) for:
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Key Advantages Over Traditional Oil Pumps:
- No oil contamination: Eliminates the risk of oil leaks, making it cleaner for sensitive applications.
- Simple maintenance: No lubrication needed, reducing long-term upkeep costs.
- Water recycling: Designed to reuse water, improving efficiency and sustainability.
- Compact & direct motor-driven: Saves space and energy compared to gear-reduced oil pumps.
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Critical Selection Factors for Buyers:
- Flow Rate: Must match the total water demand, including continuous and intermittent discharge needs.
- Power Requirements: Includes motor and pump shaft power, accounting for operational losses.
- Lift Height: Must align with system pressure needs (e.g., boiler replenishment) to avoid inefficiencies.
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Technological Improvements:
- Modern designs integrate a freshwater pump to enhance vacuum stability and efficiency.
- Overcomes traditional oil pump drawbacks (e.g., complex mechanics, leaks) while offering higher durability and lower costs.
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Performance Specifications:
- Flow rate: 80 L/min
- Lift: 10 meters
- Ultimate vacuum: -0.098 MPa (2 KPa)
- Portability: Compact (385×280×420 mm) and lightweight (11 kg), suitable for lab benches.
Why does this matter for purchasers?
When choosing between a water ring vacuum pump and traditional oil pumps, consider:
- Long-term cost savings (no oil changes, minimal maintenance).
- Environmental compliance (no hazardous waste disposal).
- Process reliability (stable vacuum pressure for sensitive applications).
For labs prioritizing clean, quiet, and efficient operations, the water ring design is often the superior choice.
Summary Table:
| Feature | Water Ring Vacuum Pump | Traditional Oil Pump |
|---|---|---|
| Contamination Risk | None (oil-free) | Possible oil leaks |
| Maintenance | Minimal (no lubrication) | Regular oil changes |
| Environmental Impact | Low (water recycling) | Hazardous waste disposal |
| Noise Level | Quiet operation | Typically louder |
| Cost Efficiency | Lower long-term costs | Higher upkeep expenses |
| Applications | Sensitive processes (e.g., pharmaceuticals) | General industrial use |
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