Transmission Modes of Liquid Ring Vacuum Pumps

1. Belt Drive (Standard Transmission for 2BE Series)

It consists of a motor, motor pulley, V-belts and pump shaft pulley. Torque is transmitted by friction force of the belts, with a protective cover installed for safety.

By replacing pulleys of different diameters, users can freely adjust the rotational speed of the vacuum pump to easily modify vacuum level and pumping capacity. The installation distance between the motor and pump body is flexible without coaxial alignment requirements, bringing great adaptability to on-site layout. The belt structure provides cushioning and shock absorption to offset minor impact loads and reduce operating vibration. Maintenance is convenient with low replacement cost for belts, and disassembly of the pump unit is unnecessary.

Disadvantages: Larger floor space occupation; belts suffer wear after long-term operation and require periodic replacement; transmission efficiency is slightly lower than direct coupling drive.

It applies to general working conditions such as chemical industry, papermaking, food processing and sewage treatment, and is the factory standard configuration for 2BE liquid ring vacuum pumps.

2. Direct Coupling Drive

The motor shaft and pump shaft are rigidly connected via an elastic coupling, with the motor and pump mounted coaxially.

This mode features low transmission loss, high efficiency and lower energy consumption. The complete unit has a compact structure with small footprint and neat appearance. Without wearing belts, frequent replacement of vulnerable parts is avoided and maintenance intervals are extended. It runs quieter with stable power transmission free of slipping.

Disadvantages: The pump speed is fixed at the rated motor speed, so pumping parameters cannot be adjusted arbitrarily; high coaxial alignment precision is required during installation, and misalignment will easily damage the coupling.

Suitable for production lines with limited workshop space, strict energy consumption requirements and stable working conditions without the need for variable pumping speed.

3. Reducer Drive (Speed Reduction Transmission)

A gear reducer is matched with the motor, and the output end of the reducer is connected to the pump shaft through a coupling to realize speed reduction and torque amplification.

It greatly reduces pump operating speed and delivers high torque, making it suitable for heavy-duty media with high water content and impurities. Low-speed operation alleviates abrasion on internal impellers and pump casings to extend overall service life. Stable vacuum output is maintained under long-term continuous heavy-load operation.

Disadvantages: Higher procurement cost; heavier and bulkier overall unit; the reducer needs regular lubricating oil refilling for maintenance.

Applicable to mines, desulfurization, large-scale chemical negative pressure processes and 24-hour uninterrupted heavy-duty working conditions.

4. Comparative Summary of Three Transmission Modes (Selection Reference for 2BE Pumps)

Belt drive: Best versatility, variable speed, cost-effective, the first choice for common projects

Direct coupling drive: High efficiency & compact size, low maintenance, dedicated for stable standard working conditions

Reducer drive: Low speed & heavy load, wear-resistant, customized option for harsh heavy-duty environments