Advantages of Simultaneous Use of Multiple Water Ring Vacuum Pumps
If customers choose three 2BV water ring vacuum pumps, one for use, one for standby and one for overhaul, they are connected in parallel with three main drainage pumps and controlled by gate valves respectively. The advantages of using water ring vacuum pump are as follows:
(1) Water-ring vacuum pump has simple structure, low processing and manufacturing requirements, no need for suction and exhaust valves, stable operation and uniform air volume;
(2) The compression of gas by water-ring vacuum pump is close to isothermal compression, and the temperature changes little during compression. There is no friction metal contact surface in the pump, so it is not easy to cause combustion and explosion accidents.
(3) The rotating parts and fixtures in the pump chamber are sealed by liquid, without lubrication, simple maintenance, easy operation and stable and reliable operation.
(4) From the results of operation, the drainage efficiency of the main drainage pump is obviously improved after using the water ring vacuum pump, and the start-up procedure is simplified, which reduces the labor intensity during the start-up of the pump. When the pump starts, it has no impact on the pump body and little damage.
(5) After using the water ring vacuum pump, the bottom valve of the inlet of the suction pipe was cancelled, the suction water was unblocked, and the drainage efficiency of the pump was improved.
(6) As the direction of water injection in the water injection pipe is from bottom to top, when the water level rises to the pump body, it can ensure that there is no air in the suction pipe and the pump body, and prevent the occurrence of cavitation, which is conducive to the daily maintenance of the main drainage pump.
Nowadays, many customers who buy rotary vane vacuum pumps reflect that the vacuum of rotary vane pumps that they bought before is always not up to, or oil leakage and injection, which brings a lot of unnecessary troubles to production. Then, what is the reason why the vacuum degree of rotary vane vacuum pump can not reach? The following points are the analysis of our company's technicians, you can take as a reference:
Insufficient oil: Normally, it is not necessary to connect the exhaust pipe. When the pump pumps large containers or carries out gas ballasting for a long time, because of the large amount of gas entering the pump, the exhaust outlet will emit a large amount of oil mist, which will reduce the amount of oil. Insufficient oil will affect the performance of the pump, and even damage the machine parts. The elimination method is to add new oil regularly.
Oil has been polluted: Pump oil will inevitably be polluted by dust, moisture or other dirt when it is often used. Pump oil contamination will affect performance, so oil needs to be changed. The oil change period depends on the nature of the gas being pumped and its actual working conditions. Generally, the oil change period of pumps during air pumping is more suitable for 1000-1500 hours of actual work.
When changing oil, it should be done in the following order:
1) thoroughly drain the old oil in the pump;
2) After the old oil is exhausted, a small amount of new oil (100-200 ml) is injected from the suction port, the pump chamber is flushed, then the pump is started for one minute, and then the injected new oil is exhausted. If the oil is still not clean, the new oil should be injected and flushed until the oil removed from the pump chamber is clean.
3) Add new oil according to the oil capacity prescribed by the pump to make the oil level reach the center of the oil standard. When refueling, attention should be paid to cleaning, and dirt should be strictly prevented from mixing into the pump.
Damage of sealing ring at suction port: There is a special bowl-shaped sealing ring in the exposed part of pump oil. The "O" type sealing ring is installed in the intake and back cover. It may be damaged after using for a long time. Therefore, oil leakage occurs, and the sealing ring should be replaced in time.
Damage of exhaust valve piece: Oil-resistant rubber valve piece is installed in the vent hole of chamber I and II respectively. In the long-term use of pump, the valve piece will be deformed due to pressure and other reasons. As a result, poor sealing and air leakage affect performance, the pump should be dismantled for inspection and timely replacement.
Poor sealing at joint: At this time, the joint of pipeline should be carefully checked to eliminate leakage.
Pump viscera, pollution is serious: whether the pump is clean directly affects the performance of the pump, in the use of the process, the pump will inevitably produce dirty, dirty and so on. It should be cleaned thoroughly with new oil, then dried and assembled carefully.
Reasons for Vacuum Degree Reduction of Medium Water Ring Vacuum Pump in Summer
Recently, many customers have reported that the vacuum of vacuum pumps (especially water ring vacuum pumps) has always been inadequate, and it has been good before. Suddenly, the vacuum has dropped a lot. Through the analysis of our company's technicians, the following reasons are obtained:
(1) In summer, the water-ring vacuum pump uses circulating water to cool working water. Often, the high temperature of circulating water leads to the decrease of pumping capacity and efficiency of the vacuum pump. Through analysis, the working water of cooling water ring vacuum pump of central air-conditioning in power plant is used to improve the vacuum of condenser, and the economic effect is considerable.
(2) When other conditions remain unchanged, the lower the working water temperature, the smaller the impact on vacuum, and the higher the working water temperature, the greater the impact on vacuum.
(3) For double back pressure condenser, because the condenser pressure corresponding to low pressure condenser is low, it is easy to appear that the limit suction pressure of water ring pump is higher than that of condenser. Therefore, special attention should be paid to the influence of working water temperature rise of water ring vacuum pump on low pressure condenser.
(4) Under low load conditions, it is better to reduce the working water temperature to improve the vacuum effect of the condenser.
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