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Do you know about vacuum pumps?

vacuum pumps

A water ring vacuum pump (referred to as a water ring pump) is a kind of crude vacuum pump, which can obtain the ultimate vacuum of 2000~4000Pa, series atmospheric ejector up to 270~670Pa. A water ring pump can also be used as a compressor, called a water ring compressor, which is a low-pressure compressor, and its pressure range is 1~2×105Pa table pressure.

The water ring pump was originally used as a self-priming pump, and then gradually used in petroleum, chemical, machinery, mining, light industry, medicine and food, and many other industrial sectors. In many processes of industrial production, such as vacuum filtration, vacuum water diversion, vacuum feeding, vacuum evaporation, vacuum concentration, vacuum regathering, and vacuum degassing, a water ring pump has been widely used. Because of the rapid development of vacuum application technology, the water ring pumps have been paid more attention to the crude vacuum acquisition. Because the gas compression in the water ring pump is isothermal, it can remove flammable and explosive gases, in addition to the removal of dust, and water containing gas, therefore, the application of the water ring pump is increasing.

Water ring vacuum pump working principle

A vacuum is a state of gas below the standard atmospheric pressure in a given space.

The use of mechanical, physical, chemical, or physical-chemical methods of the container to extract air, to obtain a vacuum machine or instrument, is called a vacuum pump.

Do you know about vacuum pumps

There are many kinds of vacuum pumps, generally can be divided into the positive displacement vacuum pump, jet vacuum pump, and other types of vacuum pump three categories, which positive displacement vacuum pump is the most widely used.

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Water ring vacuum pump working principle as a schematic diagram: in the pump body with the appropriate amount of water as the working liquid. When the impeller rotates clockwise in the direction indicated in the figure, the water is thrown around by the impeller. Due to the centrifugal force, the water forms a closed ring of approximately equal thickness determined by the shape of the pump cavity. The upper inner surface of the water ring is just tangent to the impeller hub, and the lower inner surface of the water ring is just in contact with the top of the blade (in fact, the blade has a certain insertion depth in the water ring). At this point, a crescent-shaped space is formed between the wheel hub of the impeller and the water ring, and this space is divided into several small cavities with an equal number of blades by the impeller. If the upper part of the impeller is 0° as the starting point, then the impeller in the rotation of 180° before the volume of the small cavity from small to large, and connected with the suction port on the end face, at this time the gas is inhaled, when the end of the suction small cavity is isolated from the suction port; When the impeller continues to rotate, the small cavity from large to small, so that the gas is compressed; When the small cavity is connected with the exhaust port, the gas will be discharged from the pump.

In short, the water ring pump is by the change of the pump chamber volume to achieve suction, compression, and exhaust, so it belongs to the positive displacement vacuum pump.

The impeller of the water ring vacuum pump blade is installed eccentrically in the cylindrical pump shell. Fill the pump with the required amount of water. When the impeller rotates, the water is thrown to the pump shell through development and change to form a water ring, and the inner surface of the ring is tangent to the impeller hub. Because the pump shell is different from the impeller, the intake space between the right half hub and the water ring gradually expands, so that the vacuum will be formed through the development and change, so that the gas enters the intake space of the pump through the intake pipe. Then the gas enters the left half, because the volume between the hub rings is gradually compressed and the pressure is increased, so the gas is discharged to the pump through the exhaust space and the exhaust pipe.

Working principle of rotary vane vacuum pump

A rotary vane vacuum pump (referred to as rotary vane pump) is an oil seal type mechanical vacuum pump. Its working pressure range is 101325~1.33×10-2 (PA) is a low vacuum pump. It can be used alone or as the front pump of another high vacuum pump or ultra-high vacuum pump. It has been widely used in metallurgy, machinery, military, electronics, chemical, light industry, petroleum and medicine, and other production and scientific research departments.

The working principle of the Roots vacuum pump

The pump works on a similar principle to the roots blower. Because of the continuous rotation of the rotor, the gas is drawn from the air inlet into the space between the rotor and the pump shell V0 and then discharged through the exhaust port. Because the v0 space is completely closed after suction, there is no compression or expansion of the gas in the pump cavity. But when the top of the rotor turned the edge of the exhaust port, the V0 space and the exhaust side are connected, because the exhaust side gas pressure is higher, there is a part of the gas back into the space V0 so that the gas pressure suddenly increased. As the rotor continues to operate, the gas is discharged from the pump.

The quality of the vacuum pump depends on its mechanical structure and oil quality, the use of a vacuum pump must ensure it. If the distillation of volatile organic solvents, organic solvents will be absorbed by the oil resulting in the addition of vapor pressure, so it will decrease the pumping efficiency, if it is acidic gas, it will corrode the oil pump, if it is water vapor will make the oil emulsion and bad vacuum pump.

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