Water ring vacuum pump common problem solving method

a corrosion, water ring vacuum pumps

water ring vacuum pump used in chemical industry, often will encounter corrosion problems. For highly corrosive gas or liquid, and the best processing method is the use of corrosion resistant materials pump. However, domestic products are usually made from cast iron and carbon steel. In this case, when meets the corrosive gas or liquid, can adopt the following two methods:

1. By using vacuum tank

vacuum tank is also called the separation tank, buffer tank, etc. Mainly used for suction corrosive liquid. In order to prevent the liquid flow into the pump, vacuum tank can be set before entrance of vacuum tube, makes the fluid flow in pipes into the jar, and not to enter into the pump.

2。 Adopt the method of coating anticorrosive layer

with epoxy resin and glass fiber corrosion parts such as shaft and impeller, apply a layer of epoxy resin and glass fiber. In this way, it was coated with three layers, make it natural dimming 2 - 3 days, then dry in the stove with a steam pipe. Beginning from 40, temperature rise 20 every 2 hours, baking to 120, and then released. This made of anti-corrosion materials known as glass fiber reinforced plastic, and then, according to your drawings with the shaft and the impeller of glass fiber reinforced plastic package will cease to mechanical processing.

after these corrosion measures are taken, made great effect. For example, some factory said that only in the corrosion of 20 days later, impeller can use containing corrosive liquid. After using the glass fiber reinforced plastic materials, can use at least a year. However, glass fiber reinforced plastic should not resistant to strong acid and nitric acid ( Concentration of more than 70%) , it needs to be improved.

2, water ring vacuum pump size

scaling in the water ring vacuum pump, very common, especially in coal preparation plant and chemical plant.

industry said containing calcium and magnesium salt water is hard water. Nature of the water, well water and spring water dissolved due to contact with the soil and rock many impurities. Most of these impurities are calcium carbonate and magnesium carbonate, sulfate and chloride, so they are usually hard water, and the rain is soft water.

the calcium salt and magnesium salt in the water easily, the formation of insoluble carbonate precipitation, attached to the pump parts formed on the scale. Scale easily blocked pores and cracks, firmly stick to a combination of parts surface, the influence on the performance of the pump work, even impair the normal work of the pump.

for severe scale, can adopt the following methods:

1. In hard water, adding suitable amount of hydrated lime and sodium carbonate ( The soda) Can make the bicarbonate in the water to produce insoluble carbonate precipitation, and then get soft water filter. The above reaction is faster in hot water, slowly in the cold water, which is why the water temperature is high, scale serious reason.

2。 Water ring vacuum pump used to prevent water cycle. Calcium salt and magnesium salt is a certain amount of circulating water, so the scale doesn't increase after a certain amount. This can prevent the harm of scale.

3, clean up the water ring vacuum pump air security measures

air exist in water ring vacuum pump. If the compressed gas and air mixture is unsafe, must remove air from the pump before use. For example, hydrogen is flammable and explosive gases. In the air, 4 - 75% of the hydrogen content can lead to extinguish, lit it only need 2/100000 joules. Therefore, before transporting hydrogen, water ring vacuum pump must be connected to the nitrogen gas with certain pressure box, so that the nitrogen can be full of water ring vacuum pump out of the air side by side. Cleaning effect can be measured by quenching method.

4, water ring vacuum pump suction gas including particle

if pumping gas containing solid particles, part of the particles with gas discharge pump, another part of the particles will from time to time at the pump clearance friction, which resulted in increased clearance, lead to leakage increase and a decline in vacuum and gas volume. Therefore, water ring vacuum pump is not suitable for pumping gas contains a lot of solid particles, especially the size, hardness higher solids.

if you can't prevent, can purification treatment in gas into the pump, Such as filter, separating tank, etc. ) Before. ) 。 If purification difficulties, particles in the pump should be cleaned with water after cleaning

if pumping gas has certain solubility in water, in order to prevent the loss of the gas, don't let it go with the water. Or compressed gas toxic, to prevent the harm and pollution; Or to reduce the scale, the water in the pump should not be interlinked with the outside world, and should adopt the method of blocking circulation.

6, water ring vacuum pump pumping liquid problem

if the water ring vacuum pump suction gas contains a certain amount of water or completely pumping water or other liquids, the performance of the pump and the performance of the pump gas is different. The primary difference between them is:

1. Reduced the volume of air,

2. Shaft power increased significantly.

3。 in a certain range is not stable.

7. 2 bva water ring vacuum water pump cavitation

under certain temperature and pressure, the liquid and vapor can mutual transformation. For example, 100 of the water. In a boiling under atmospheric pressure and translated into steam. Similarly, 100 of water vapor. In one or more than 1 a tm atmospheric pressure, carbon dioxide can also condenses into water.

the phenomenon of mutual change depends on the water and steam temperature and external pressure of the liquid. For example, when the liquid surface pressure is 6. 5 mm hg, the water will boil. Also, any liquid and the phenomenon of water.

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