2BV water ring vacuum pump

summary:
The 2BV series vacuum pump is based on the traditional water ring vacuum pump in China. It adopts a coaxial direct connection design with high reliability, easy installation and maintenance, and has a volume 30% less than traditional vacuum pumps. It runs smoothly, with a noise level below 62 decibels, and has self-priming ability, making it easy to operate. Due to its oil-free design, it is essentially maintenance free as mechanical seals are used to eliminate leaks. 50% of the working fluid in the air-water separator equipped with this pump can be recycled, reducing pollution and lowering operating costs. The pump adopts bronze impellers, which improves the corrosion resistance of the pump. According to user requirements, stainless steel material is used, and the pump will operate normally in harsh environments. Therefore, it is widely applicable in industries such as chemical, pharmaceutical, food, papermaking, and steel.

2BV water ring vacuum pumpPurpose and scope of use:
The 2BV series water ring vacuum pump is a single-stage pump with a coaxial structure. The shaft seal adopts mechanical seal, which has the characteristics of simple structure, easy installation, oil-free, safe and reliable.
The 2BV series water ring vacuum pump is suitable for extracting gases and moist steam, with a suction pressure of up to 33mbar absolute pressure (97% vacuum degree). When the 2BV water ring vacuum pump works for a long time at a suction pressure below 80mbar, a cavitation protection pipe should be connected to protect the pump. If the 2BV water ring vacuum pump is equipped with an atmospheric injector, the suction pressure can reach 10mbar, and the injector can be directly installed on the suction port of the vacuum pump. When used as a compressor, its pressure can reach up to 0.26MPa (absolute pressure).
The 2BV series water ring vacuum pumps and compressors are widely used in industries such as petroleum, chemical, pharmaceutical, food, and sugar manufacturing. Due to the isothermal compression process of gas during operation, it is less prone to explosion when compressing and suctioning flammable and explosive gases, making it more widely used.

2BV water ring vacuum pumpWorking principle:
As shown in Figure (1), the impeller 3 of the 2BV water ring vacuum pump is eccentrically installed inside the pump body. When starting, a certain height of water is injected into the pump. Therefore, when the impeller 3 rotates, the water is subjected to centrifugal force and forms a rotating water ring 1 on the inner wall of the pump body. The lower inner surface of the water ring is tangential to the hub and rotates in the direction of the arrow. During the first half of the rotation process, the inner surface of the water ring of the 2BV water ring vacuum pump gradually separates from the hub, forming a closed space between the impeller blades and the water ring. As the impeller rotates, the space gradually expands, the gas pressure in the space decreases, and the gas is sucked in from the suction port of the circular disk; During the latter half of the rotation, the inner surface of the water ring gradually approaches the hub, and the space between the blades gradually shrinks. The gas pressure in the space increases, and when it exceeds the pressure at the exhaust port, the gas between the blades is discharged from the disc exhaust port. In this way, every time the impeller rotates, the space between the blades sucks and exhausts once, and many spaces work continuously. The 2BV water ring vacuum pump continuously sucks or compresses gas.
The 2BV water ring vacuum pump generates heat during operation, which causes the working water ring to heat up. At the same time, some water and gas are expelled together. Therefore, during operation, it is necessary to continuously supply water to the pump to cool and replenish the water consumed inside the pump, in order to meet the working requirements of the pump.
When the gas discharged from the 2BV water ring vacuum pump is no longer used, a gas water separator is connected to the exhaust port of the 2BV water ring vacuum pump. After the exhaust gas and some of the carried water are discharged into the gas water separator, the gas is separated and the gas is discharged through the exhaust pipe. The remaining water is supplied to the pump through the return pipe for continued use. With the extension of working hours, the temperature of the working water will continue to rise. At this time, cold water needs to be supplied from the water supply pipe to reduce the temperature of the working water and ensure that the pump can meet the required technical requirements and performance indicators.

When the 2BV water ring vacuum pump is used as a compressor, the pump exhaust port is connected to a gas water separator. The gas water mixture enters the gas water separator and is automatically separated. The gas is transported to the required system through the exhaust pipe, and the working water enters the 2BV water ring vacuum pump through the separator. When compressing gas, the working water is extremely hot, and the water is discharged from the pump exhaust port, causing the temperature to increase. Cold water needs to be continuously supplied from the water supply pipe to replenish the released water and also serve as a cooling effect, so that the working water temperature does not become too high, thereby ensuring the performance of the compressor, meeting technical specifications, and meeting process requirements.

Note: 1. The data listed in the table were measured under the following technical conditions:
① Atmospheric pressure 101325Pa (1013mbar)
② Inlet water temperature 15 ℃
③ Inhalation air temperature 20 ℃
④ Air relative humidity 70%
2. Performance allowable deviation ± 10%

Start and Stop of 2BV Water Ring Vacuum Pump
1. Start the water ring vacuum pump
Before starting the water ring vacuum pump that has been parked for a long time, it must be manually rotated several times to confirm that there is no jamming or other damage inside the water ring vacuum pump.
Start the water ring vacuum pump in the following order (see Figure 5)
(1) Open the exhaust valve.
(2) Start the motor (pay attention to the forward and reverse rotation of the motor)
(3) Quickly open water supply pipe 2 in Figure 5. Gradually increase the water supply until it meets the specified requirements (be careful not to run the vacuum pump dry).
2. Shutdown of water ring vacuum pump
The water ring vacuum pump should be stopped in the following order:
(1) If there is a valve in the intake pipe, close the valve on the intake pipe.
(2) Close water supply pipe 2 and quickly shut down the vacuum pump.
(3) After parking, the water in the pump chamber should be drained to avoid blade and pump shaft breakage when starting again.

Maintenance of 2BV water ring vacuum pump
1. To avoid wear and tear on the impeller, pump body, or jamming of the impeller, dust particles that enter the pump chamber with gas and working fluid can be washed away through the flushing port at the bottom of the 2BV water ring vacuum pump.
2. If hard water is used as the working fluid, it must be softened or the pump must be cleaned with a solution within a certain period of time.
3. The bearings of the 2BV water ring vacuum pump motor are often operated at a temperature 15 ° C to 20 ° C higher than the surrounding temperature, and the temperature should not exceed 55 ° C to 60 ° C. The bearings that work normally should be oiled 1-2 times a year, cleaned at least once a year, and all lubricating oil should be replaced.
4. If the mechanical seal used in the 2BV water ring vacuum pump leaks, the dynamic and static rings of the mechanical seal should be checked for damage or aging of the sealing ring. If the above situation occurs, new parts should be replaced.

Faults and elimination methods of 2BV water ring vacuum pump