High-Performance Dry Screw Vacuum Pumps

Engineering the future of vacuum technology with Oil‑Free Dry Screw Vacuum Pump solutions designed for efficiency, durability, and environmental compliance.

Product Overview: The Evolution of Vacuum Technology

In the demanding landscape of modern industrial processing, the shift from traditional oil-sealed systems to dry vacuum technology is not just a trend—it is a necessity. At Ever-Power, we specialize in manufacturing the Industrial Dry Screw Vacuum Pump, a pinnacle of engineering designed to meet the rigorous standards of the pharmaceutical, chemical, and semiconductor industries.

The LGB Series Dry Screw Vacuum Pump represents a significant leap forward. Unlike liquid ring pumps that face cavitation risks or oil-sealed pumps that struggle with emulsification and contamination, our dry screw technology offers a pure, unpolluted vacuum environment. By utilizing a pair of meshing screws that rotate synchronously at high speeds in opposite directions within the pump casing, we generate a powerful pumping action capable of handling tens or sixteen strokes efficiently. This mechanism ensures that the gases are moved through the pump without the need for internal lubricants in the compression chamber, resulting in a truly High Vacuum Dry Screw Pump system.

Working Principle & Core Mechanism

The heart of the Ever-Power Dry Screw Vacuum Pump System lies in its precision rotors. The two screws undergo rigorous dynamic balancing and are supported by high-load bearings, installed securely within the pump casing. A precise, calculated clearance exists between the screws and between the screws and the casing.

As shown in Figures 1 and 2, a pair of parallel spiral skins ① and ② are arranged inside the handle vacuum pump. ① is right-handed, and ② is left-handed. The two skins rotate synchronously in opposite directions within the pump via a pair of gears ③. There is no friction between the skins and between the skins and the pump body, maintaining a relative gap. Multiple sealed cavities ④ are formed between the two skins and the pump body ⑨, the number of which equals the number of spiral turns of the skins.

When the two skins rotate in the directions shown in the figures, the space of the sealed cavity connected to the intake port increases, and gas is drawn in and pushed to the seepage side. The sealed cavity space on the seepage side gradually decreases during rotation, and the gas is compressed to the seepage port. These sealed cavities "move" regularly from the seepage side of the pump to the seepage side, thus sending the gas out in a swirling flow. The continuous movement of the pump does not change the gas flow direction, thus allowing for the extraction of entrained particles and vapors within a certain range.

During prolonged operation, a suitable amount of coolant needs to be circulated into the jacket of the pump body and side covers to cool the pump and achieve temperature equilibrium.

Since the heat of compression is mainly generated on the spindle side, for sufficient cooling, under most operating conditions, a suitable amount of air mixed with a suitable gas can be introduced into the pump chamber through the compression port ⑩.

Because there is no friction between the rotors, no lubrication is required in the swept volume. This design allows the pump to:

• Handle Condensables: Effectively remove gases containing large amounts of condensable vapors (like water or solvents) without contaminating the pump oil.
• Process Particulates: The non-contact design allows for the passage of dust and small particulates that would typically seize a piston pump.
• Ensure Purity: Ideal as a replacement for oil-sealed mechanical pumps, liquid ring pumps, and reciprocating pumps where clean vacuum is paramount.

LGB Series Performance Specifications

Our comprehensive range of High Performance Dry Screw Vacuum Pumps ensures we have the right model for your specific flow rate and pressure requirements.

*Note 1: LGB30 discharge end grease usage 0.2L, inlet end usage 0.4L.
*Note 2: LGB150E, LGB180E adopt mechanical seal structure, motor power is 18.5kW.

Key Features & Advantages

Installation Dimensions

Model Dimensions: LGB-70E ~ LGB-230E

Model Dimensions: LGB-300 ~ LGB-500

Industry Applications

The versatility of the Ever-Power Energy Efficient Dry Screw Vacuum Pump series makes it the preferred choice across various sectors. Our pumps are engineered to withstand the toughest operating conditions.

Pharmaceutical Industry

In pharmaceutical manufacturing, purity is non-negotiable. Our pumps are used for vacuum drying, freeze-drying, and reactor degassing. The oil-free nature prevents back-streaming contamination, ensuring compliance with GMP standards. The Dry Screw Vacuum Pump for Freeze Drying Applications ensures rapid sublimation without the risk of oil mist affecting the sensitive biological products.

Chemical Processing

Chemical processes often involve corrosive or explosive gases. The LGB series, when equipped with specific anti-corrosion coatings, serves as an excellent Dry Screw Vacuum Pump for Chemical Processing. It handles solvent recovery and distillation effectively, processing vapors that would degrade the oil in traditional pumps instantly.

Semiconductor & Electronics

For etching, CVD (Chemical Vapor Deposition), and PVD processes, the Dry Screw Vacuum Pump for Semiconductor Manufacturing is essential. It provides the clean, stable vacuum required for microchip fabrication, handling aggressive process gases while maintaining long maintenance intervals.

Food Packaging & Processing

Used extensively in modified atmosphere packaging (MAP) and vacuum cooling, our Dry Screw Vacuum Pumps for Food Packaging ensure hygiene and extend shelf life by eliminating oxygen without introducing contaminants.

Selection Guide: How to Choose Your Dry Screw Pump

Choosing the correct Industrial Dry Screw Vacuum Pump requires analyzing several key factors:

1. Determine the Required Vacuum Level: Are you looking for rough vacuum or medium/high vacuum? The LGB series provides excellent ultimate pressure (down to 5 Pa), but for higher vacuum needs, it can be paired with a Roots booster.
2. Calculate Pumping Speed: Assess the volume of the chamber and the required time to reach the target pressure. Refer to the specifications table above (L/s or m³/h) to match your throughput requirements.
3. Analyze Gas Composition:
   • Is the gas corrosive? (Requires anti-corrosion coating).
   • Does it contain solvents? (Dry screw pumps are ideal as they don't use oil).
   • Is it flammable? (Requires explosion-proof motors and specific seals).
4. System Integration: Consider if you need a standalone unit or a Dry Screw Vacuum Booster Pump System for enhanced performance.

Note: For corrosive operating conditions or complex system designs, please contact our engineering team for a customized solution.

What Our Customers Say

Frequently Asked Questions (FAQ)

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