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Application and Success Stories of the Alm Water-Loop Air-Cooled Roots Vacuum Pump Unit in the Chemical Industry
Release date:
2025-03-24 16:37
Source:
With the development of the social economy, the chemical industry is seeing a growing demand for efficient and reliable equipment. In this industry, Alm's water-ring air-cooled Roots vacuum pump units have demonstrated outstanding performance and hold great potential for widespread application. This article will highlight the features and advantages of the Haokade water-ring air-cooled Roots vacuum pump unit used in this project, as well as explore the significant value it brings to chemical production processes.
1. Overview of the Alm Water-Loop Air-Cooled Roots Vacuum Pump Unit
The Alm water-ring air-cooled Roots vacuum pump unit is a vacuum device that operates based on the Roots principle. It generates continuous pressure variations through the rotation of its impeller, drawing the gas being evacuated from the inlet, compressing and discharging it multiple times within the chamber, and finally expelling it through the outlet. Compared to traditional vacuum pumps, the Alm water-ring air-cooled Roots vacuum pump unit boasts advantages such as a simple structure, reliable operation, and rapid pumping speed.
Crew Introduction
Crew Overview:
System requirements for evacuation: A total of 50 m³ of gas (at atmospheric pressure) must be removed from the reactor and associated pipelines. In winter, the system must achieve a vacuum level of at least -0.095 MPa (gauge pressure) within 10 minutes; in summer, the target is -0.094 MPa (gauge pressure) within the same timeframe. To meet both the evacuation time and vacuum targets, while ensuring overall unit stability and enabling continuous, reliable operation even under high-pressure differentials, the designed vacuum unit type is a gas-cooled three-lobe Roots liquid-ring vacuum system.
2. The structural principle of the air-cooled Roots vacuum pump:
Ordinary Roots vacuum pumps generate heat during operation due to the compression of gas, and the amount of heat produced is directly related to the pressure difference between the inlet and outlet. A larger pressure differential results in more heat, leading to a greater temperature rise in the pump itself. While the overall temperature of the pump casing can be managed through atmospheric cooling, the rotor—being unable to dissipate heat effectively—continues to warm up. This creates a noticeable temperature difference between the rotor and the pump housing. As the rotor heats up significantly, it undergoes thermal expansion, and if the temperature reaches a critical point, the rotor may eventually seize up entirely. Beginning in the 1980s, we took the lead in China by successfully developing a gas-circulating cooled Roots vacuum pump. This innovative design primarily consists of Rotor 1, Rotor 2, Pump Body 4, and Cooler 7. Thanks to its unique structural configuration, this pump can operate reliably over extended periods, even under conditions of high pressure differentials and compression ratios. The cooling gas enters the pump’s intake chamber from both sides of the pump body, preventing overheating caused by gas compression—while simultaneously ensuring that the pump’s pumping performance remains unaffected. Figures I through IV illustrate the rotor rotating within the pump cavity, completing one full cycle of gas intake and exhaust. Notably, the cooler and motor are essential accessories for each pump unit, with their specifications tailored to meet specific operating conditions. These pumps can be used individually or connected in series, either as standalone units or integrated into multi-stage configurations alongside liquid-ring vacuum pumps and conventional Roots pumps. Such setups enable the system to achieve even higher levels of vacuum, perfectly suited to meet the diverse requirements of various industrial processes.
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