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2BE1S Liquid Ring Vacuum Pump

The 2BE1S series liquid-ring vacuum pump is a two-stage, single-action liquid-ring vacuum pump that builds upon the design of the 2BE1 series. The 2BE1 series vacuum pumps have a极限 pressure of 3,300 Pa and an ideal working pressure range of 20 kPa to 100 kPa. When the inlet pressure drops below 20 kPa, the pumping capacity rapidly declines, at which point using a single-stage liquid-ring vacuum pump becomes highly inefficient. The 2BE1S series liquid-ring vacuum pump is designed with a two-stage compression process, ensuring stable pumping speed over a wider range of high vacuum levels or maintaining high vacuum levels even at very high pumping rates. At higher vacuum operating conditions, the efficiency of the 2BE1S series pump improves by 35% to 40% compared to that of a single-stage liquid-ring pump, and energy consumption is correspondingly reduced.

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　　The 2BE1S series liquid-ring vacuum pump is a two-stage, single-action liquid-ring vacuum pump that builds upon the design of the 2BE1 series. The 2BE1 series vacuum pumps have a maximum allowable pressure of 3,300 Pa and an ideal working pressure range of 20 kPa to 100 kPa. When the inlet pressure drops below 20 kPa, the pumping capacity rapidly declines, at which point using a single-stage liquid-ring vacuum pump becomes highly inefficient. The 2BE1S series liquid-ring vacuum pump is designed with a two-stage compression process, ensuring stable pumping speed over a wider range of vacuum levels or maintaining high vacuum levels even at very high pumping rates. At higher vacuum operating conditions, the efficiency of the 2BE1S series pump is improved by 35% to 40% compared to that of a single-stage liquid-ring pump, and energy consumption is correspondingly reduced.

Working principle

　　The operating principle of the 2BE1S two-stage liquid-ring vacuum pump for suction and exhaust is identical to that of the 2BE1 single-stage liquid-ring vacuum pump. As the impeller rotates, a water ring—eccentrically positioned relative to the impeller—is formed along the inner wall of the cavity. The water filling the spaces between the blades continuously undergoes periodic reciprocating motion as the impeller spins, causing the volume enclosed between the blades to vary periodically. In conjunction with the fixed suction and exhaust ports, this variation in blade chamber volume enables the processes of suction, compression, and exhaust to be completed sequentially. The dual-stage design allows the gas discharged from the first stage to be drawn into the second-stage suction port, where it undergoes further compression before being expelled. The second stage serves to reduce the discharge pressure from the first stage, thereby enhancing the vacuum level at the first-stage suction inlet.

Features of the 2BE1S Two-Stage Liquid Ring Vacuum Pump

　　The maximum pressure can reach 2 kPa, and the inlet working pressure range is 5 kPa to 20 kPa.

　　Multiple specifications ranging from 200 to 7,500 m³/h to meet various process requirements.

　　A variety of material options available, including stainless steel, duplex steel, titanium, and Hastelloy.

　　Reliable impeller locking and anti-loosening method

　　Mechanical seals at both ends, with a variety of flushing options available.

　　Standard cavitation-resistant device

　　Reliable performance, high efficiency, and energy saving.

　　Precision castings, imported bearings, high-grade components

Application areas

　　Perfect design, rational structure, and reliable performance—particularly well-suited for vacuum drying, concentration, evaporation, distillation, dehydration, degassing, and filtration processes in various industries such as chemical, food, pharmaceutical, textile, power, papermaking, metallurgy, and instrumentation.

　　It works particularly well when used as a forepump for Roots vacuum pumps.

Typical applications

　　Vacuum evaporation/distillation process for the accompanying evaporator

　　The vacuum system for evaporators generally requires a relatively high pumping capacity with an inlet vacuum level between 6 and 10 kPa. A single-stage liquid-ring vacuum pump exhibits significantly reduced pumping capability within this range, whereas a two-stage liquid-ring vacuum pump delivers its maximum pumping performance at this point. Under the same energy consumption, efficiency improves by more than 30%.

　　Fine Chemicals Top-Pressure Vacuum Unit

　　Vacuum systems for atmospheric and vacuum distillation also require substantial pumping capacity at lower vacuum levels. Even when a single-stage liquid-ring vacuum pump equipped with a first-stage atmospheric ejector is selected, its pumping rate at an inlet pressure of 5–6 kPa amounts to only 65–70% of the pump’s maximum capacity. Therefore, a two-stage liquid-ring vacuum pump is the ideal choice for vacuum systems used in atmospheric and vacuum distillation.

　　Vacuum Pumping System for Power Plant Turbine Condensers

　　Currently, power plants typically use a combination of 2BE1 series liquid-ring vacuum pumps connected in series with a single-stage atmospheric ejector to evacuate condensers. Although this configuration improves the vacuum level achieved by the atmospheric ejector, it results in reduced pumping efficiency and higher energy consumption. The 2BE1S series two-stage liquid-ring pumps can deliver a maximum air flow rate of up to 7,500 m³/h. When equipped with high-quality heat exchangers, instruments, and valves, these pumps meet stringent requirements for high reliability.

　　Roots vacuum pump unit composed of matched Roots vacuum pumps

　　The Roots vacuum unit, equipped with a two-stage liquid-ring pump paired with a high-quality control system, is key to ensuring the unit’s long-term, stable operation. Currently, liquid-ring Roots units typically use 2BE1 and 2BV series liquid-ring vacuum pumps as the forepump. During operation, however, the Roots pump often experiences overload, overheating, and a shortened service life. By using the 2BE1S series two-stage liquid-ring pump, the unit can achieve greater pumping capacity even at lower inlet pressures—thus reducing the discharge pressure of the Roots pump and keeping it consistently within the allowable pressure differential range. This prevents overload and overheating, thereby guaranteeing the unit’s safe and reliable operation.

Comparison and Selection of Two-Stage Liquid Ring Pumps and Single-Stage Liquid Ring Pumps

　　Two-stage and single-stage liquid-ring vacuum pumps are designed and developed for different operating conditions. As shown in the curves above, the single-stage liquid-ring vacuum pump experiences a severe drop in pumping speed within the higher vacuum range (below 20,000 Pa); at pressures between 5,000 and 10,000 Pa, its pumping speed can even fall below 30% of its maximum value. Under these conditions, the pump’s efficiency is extremely low, and its power consumption is relatively high. However, in the rough vacuum range, the single-stage pump demonstrates its advantage of large pumping capacity. In contrast, the two-stage liquid-ring vacuum pump can achieve a higher pumping speed over a wider range of vacuum levels or maintain a consistently high vacuum level over a broad pumping rate range. At higher vacuum operating conditions, its efficiency improves by 35% to 40% compared to the single-stage liquid-ring pump, and its energy consumption is correspondingly reduced. Therefore, to achieve energy savings and economical operation, it is essential to select the appropriate vacuum pump based on the specific application conditions.

Technical Parameters

Model	2BE1S102	2BE1S103	2BE1S152	2BE1S153	2BE1S1202		2BE1S203	2BE1S252		2BE1S253
Ultimate pressure kPa	2	2	2	2	2		2	2		2
Pumping rate m³/h	235	340	465	600	760		1130	1700		2450
Rotational speed rpm	1450	1450	1460	1460	980		980	740		740
Transmission method	Coupling transmission
Matching power kW	11	15	18.5	22	30	45		55	75
Water supply quantity m³/h	1.3	1.7	2	2.2	2.4	3.1		5.2	6.2
Inlet and outlet port diameter mm	50	50	65	65	100	100		125	125
Water supply caliber	G3/4″	G3/4″	G3/4″	G3/4″	G3/4″	G3/4″		G1″	G1″
Weight kg	350	400	530	560	1040	1340		2010	2500