Basic knowledge of water ring vacuum pump _

water ring vacuum pump ( Water ring vacuum pump) Is a kind of coarse vacuum pump, it can obtain the limits of the vacuum is 2000 ~ 4000 pa, pa series air ejector can reach 270 ~ 670. Water ring vacuum pumps can be used as a compressor, also known as water ring compressor, belongs to low pressure compressor, the pressure range of 1 ~ 2 x 105 pa gauge pressure.

water ring vacuum pump was originally used as a self-priming pump, then gradually used in petroleum, chemical industry, machinery, mining, light industry, medicine and food and many other industries. In many industrial production process, such as vacuum filter, vacuum water diversion, vacuum feed, vacuum evaporation, vacuum concentration, vacuum resurgence and vacuum degassing, water ring vacuum pump has been widely used. Due to the rapid development of vacuum technology, water ring vacuum pump in crude vacuum has been paid great attention by people. Because of the water ring vacuum pumps, gas compression is isothermal, so pumping flammable, explosive gas, it also can smoke in addition to the dust, water, gas, therefore, water ring vacuum pump application is increasing.

the principle diagram of the working principle of the water ring vacuum pump such as: in the pump body is equipped with the right amount of water as working fluid. When the impeller according to the graph indicates the direction of clockwise, impeller water to be thrown around, due to the effect of centrifugal force, the water formed a decision in the pump cavity shape similar to the thickness of the closed circle, etc. Water ring of the surface of the upper part of wheel tangent with the impeller, the inside surface of the lower water ring coincided with the top blade contact ( In fact blades in water ring there a certain insertion depth) 。 As the impeller wheel hub with a crescent-shaped space formed between water ring, and this space is divided into impeller blade is equal to the number of a number of small cavity. If the upper part of the impeller 0 ° as starting point, so in front of the rotating impeller 180 ° when small cavity volume changes from small to big, and on the face of inspiratory mouth, air is sucked into at this time, when the suction at the end of the small cavity is isolated from the rest of inspiratory mouth; When the impeller to rotate, small cavity from large to small, make the gas is compressed; When small cavity with vent gas was discharge pump.

to sum up, the water ring vacuum water pump is accomplished by the change of the pump cavity volume of suction, compression and exhaust, so it belongs to the variable capacitance type vacuum pump.

water ring vacuum pumps and other types of mechanical vacuum pump has the following advantages compared to

simple structure and manufacture accuracy is not high, easy to processing.

the structure is compact, the revolutions of the water pump is higher, can generally be straight league with motor, speed reducer. So with the structure of the small size, you can get large displacement, covers an area of small also.

compressed gas is isothermal, basically the process of compressed gas temperature change is very small.

because no metal friction pump cavity surface, the pump inside without lubrication, and wear and tear is small. The seal between the rotating and stationary parts can be directly done by the water seal.

inspiratory uniform, work stable and reliable, simple operation, easy maintenance.

water ring vacuum pump also has its disadvantages

efficiency is low, generally around 30%, better can amount to 50%.

vacuum degree is low, not only because this is limited by the structure of the, more important is restricted by working liquid saturation vapour pressure. Water as working fluid, the limit pressure can reach 2000 ~ 4000 pa. Oil as working fluid, up to 130 pa.

all in all, as a result of water ring vacuum pumps, gas compression is isothermal, them. the pumping flammable, explosive gas. Because there is no exhaust valve and the friction surface, therefore can be pumping gas with dust, non-condensable gas and water mixture. With these outstanding features, although its efficiency is low, is still widely used.

water ring vacuum pump start-up, operation, parking point

1. Water ring vacuum pumps should be done before driving

( 1) Dynamic coupling disc check any card.

( 2) Check the peripheral security environment, check whether the ministries screw fastening, all parts are in good condition, all lubricating points are in good condition.

( 3) When driving close intake pipe and exhaust pipe first, then fill the pump of the stuffing box and gas water separator, when gas water separator to spill water, start the motor, and then open the exhaust pipe and inlet pipe.

2, after the water ring vacuum pump drive should be

( 1) To hold position in the running, check motor, bearing temperature is normal, all lubricating points lubrication are in good condition.

( 2) Adjust water seal into the water, in the assurance of the pump seal at the same time try to reduce water consumption.

( 3) Adjusting to the water, gets water separator water level in a specified height, so that the pump with the least amount of water consumption to achieve the highest degree of vacuum.

( 4) Regularly check the vacuum pump and automatic drainage device is normal, it is forbidden to filtrate into the vacuum pump. The standby pump shall be held once every ten days, to avoid rust inside the pump.

3, water ring vacuum pump when parking should be

( 1) Close the inlet pipe first, then close the exhaust pipe, and then a power outage and stop to fill in packing and gas water separator.

( 2) When the gas water separator closed to the spillover of water overflowing, close to the water injection pipe in the pump.

( 3) If the pump stop for a long time, have to unscrew the pump and gas water separator offlet put water thoroughly clean, winter to do a good job in antifreeze to prevent frost crack pumps and pipes.