How to deal with the pollution of vacuum system

How to deal with the pollution of vacuum system

Low vacuum devices, such as vacuum conveying, vacuum impregnation, vacuum filtration, vacuum monotony, vacuum degassing (liquid steel disposal), etc., require low vacuum pumping units with high working pressure and large exhaust volume. The main pumps of such low vacuum pumping units are commonly used reciprocating vacuum pumps, oil sealed vacuum pumps, water vapor radiation pumps, water ring pumps, roots pumps, etc. the low vacuum pumping units used shall also be in accordance with For the cleanliness, humidity or other special requirements of the extracted gas, necessary dust remover, monotone tank and other components shall be equipped. During the tightening process, water vapor will condense into water drops and mix with the pump to form a suspension, which will not only make the vacuum drop, but also rust the pump cavity and rotor, damage the sealing surface and make the ultimate vacuum drop of the pump. Therefore, it is very important to prevent water vapor from polluting the mechanical pump

The preventive measures are as follows: (1) select oil seal mechanical pump with air ballast; (2) stop the disposal of the mechanical pump oil mixed with water by oil loading separator, centrifugal separator or oil-water separator, and the disposed oil will flow into the pump for use; (3) use the single agent with strong water absorption; (4) use the liquid nitrogen cold trap, which can not only effectively absorb water vapor, but also prevent the mechanical pump oil from returning to the high vacuum chamber Oil diffusion pump vacuum system pollution and prevention and control of oil diffusion pump vacuum system is the most commonly used vacuum system. The range of vacuum degree obtained is 1.3 × 10-3 ~ 1.3 × 10-5 Pa. after long-term application, the common defects are that the vacuum degree cannot be pumped up, or the vacuum degree cannot reach the original limit vacuum level, and the oil vapor pollution of the vacuum chamber wall , pollution of various pollutants in the vacuum process. The prevention methods are: (1) clean the vacuum chamber regularly; (2) stop cleaning the oil seal mechanical vacuum pump and oil metal diffusion pump regularly

Vacuum Pump Of Automobile Brake System

Liquid Ring Vacuum Pump

Roots Vacuum Pump

Assembly of combined water ring vacuum pump

Assembly of combined water ring vacuum pump

The assembling method of the combined pump is slightly different from that of the integral pump. Taking zb-65 small five piece rotary vane pump as an example, it is composed of high and low end cover plates, high and low pump cavity plates and middle diaphragm plates. The assembling sequence is as follows.

First, clamp the bottom of the middle diaphragm assembly upward on the long vise (100 caliber 220 mm long), and pay attention not to use too much force, so that the sealing faces of Liu are squeezed out. When clamping, two pieces of block iron (about 10 mm thick) less than the thickness of the pump assembly shall be padded. Because the high and low rotor shafts of this kind of pump work synchronously by engaging each other through the cross joint at the end of the shaft, so when assembling, first install the high vacuum pump cavity group on the side of the pump wheel. The specific method is to install the rotating plate and spring into the high rotor groove, then squeeze the rotating plate into the pump cavity, and then insert the shaft end with convex head into the shaft hole of the middle diaphragm, and then insert the shaft seal hole on the end cover plate Align the rotor shaft and insert the bolt to fix the high-end two groups of pieces on the middle diaphragm, while tightening the bolt, rotate the installed pump roller. When the bolt is not too tight, tap the end cover with a small hammer to make the rotor and the pump cavity naturally diagonal (at a right angle), and then firmly tighten the bolt. However, it should be noted that when turning the pump wheel, there should be no blocking sense, and then install another low vacuum end; low rotor shaft end cross The groove shall be connected with the convex head of the high rotor extending through the middle diaphragm. After the low end cover is installed in the same way, it shall be fixed tightly. Similarly, tap the end cover lightly with a hammer. Finally, tighten the bolt. At this time, it shall take a lot of effort to rotate the pump wheel at first. After a few weeks, one hand shall rotate, but there shall be no partial wheel weight block. Then, dismantle the two end covers again, and take out the rotating pieces by hand Rotor, carefully observe whether there are even line scratches on the rotor, if so, it indicates that the assembly is appropriate.

If there is a section of black and bright line at one end of the rotor, it is necessary to further check whether there is taper at both ends of the rotor or the pump cavity. If the two ends are the same size, it means that the angle between the rotor and the pump cavity is not right, and the rotor is installed askew. According to the position of the black line on the rotor, the correction effect depends on the actual operation experience. After the installation is dangerous, tap the end cover, and then rotate the belt pulley with both hands to see if there is any local pulley If there is no trace of light scribing on the rotor after it is removed, it means that the rotor does not lean against the pump cavity at all. At this time, raise one or two threads of the laminations at both ends of the middle diaphragm (this is only necessary to enlarge the holes of the four corner fixing bolt), so that the pump cavity and the rotor are tightly closed. If no other defects are found, apply shellac solution at the sealing joint to assist in sealing, and finally install Oil test and pumping test.

Vacuum Pump Impregnated In Vacuum And High Pressure

High Speed Rotary Vane Vacuum Pump

Silent Oil Free Vacuum Pump

rotary vane vacuum pump structure

rotary vane vacuum pump structure

The rotary vane vacuum pump is actually a kind of positive displacement pump, mainly composed of stator, rotor, rotary vane, etc. it sucks in and compresses the gas by means of the continuous operation of the rotary vane in the pump cavity, and then discharges the gas from the exhaust port. There are two rotors in the rotor slot, and the rotor spring is placed between the two rotors, so the inlet and exhaust ports on the stator are separated into two parts by the rotor and the rotor.

When the rotor of the rotary vane vacuum pump rotates in the stator cavity, the rotary vane begins to slide in the inner wall of the pump cavity under the joint action of the spring tension and its own centrifugal force, and at the same time, the volume of the exhaust port is gradually reduced to compress the inhaled gas, and then discharged from the exhaust port, so as to achieve the purpose of air extraction.

Dry Type Oilless Vacuum Pumps

Water ring vacuum pump

Rotary Vane Vacuum Pump

How to draw water from vacuum pump

Vacuum pump is often used for vacuum filtration, vacuum water diversion, vacuum feeding, vacuum evaporation, vacuum concentration, vacuum moisture return and vacuum degassing and other industrial purposes. This paper will tell you how the vacuum pump is used for water diversion from the perspective of vacuum water diversion.

1. Close the gate in the pressure water pipe of the water pump and inject water into the vacuum pump. After filling water, close the valve on the funnel, open the air inlet valve on the air inlet pipe and the ball valve of the water supply pipe, and then start the vacuum pump.

2. The mixture of water and gas is discharged from the exhaust pipe. At first, the gas in the mixture accounts for the main component, then, the water component is more and more, until it is all water, it means that the water has been fully filled with the pump, so the water diversion is completed, and the pump can be started. Re speed is to close the intake pipe valve on the intake pipe and stop the operation of the vacuum pump.

3. If there are more than two pumps in the pump station, the air inlet pipe of the vacuum pump can be connected with the air extraction main pipe, and the top of the pump shell of each pump is connected with the air extraction main pipe through the air extraction branch pipe. A valve is installed on each branch pipe so that each pump can be pumped separately.

4. Sometimes, for the sake of standby, two vacuum pumps can be set, and valves are installed on the intake pipe of each pump. In case of failure of one pump, the air inlet valve on the pump can be closed and another pump can be used to extract air, so as not to delay the start of the pump. Under normal circumstances, two vacuum pumps can pump air to the pump at the same time to speed up the water diversion speed.

Of course, when using the vacuum pump, follow the steps to prevent failure or danger.

Water Ring Vacuum Pump Material

Liquid Ring Vacuum Pump

Roots Vacuum Pump

How to polish water ring vacuum pump

How to polish water ring vacuum pump

In the process of using the water ring vacuum pump, there are many problems, some of which are easy to solve, some of which may hurt the user, so this problem -- the surface of the device has a barb. If the surface of the equipment is equipped with barbs and other defects, it will accumulate dust and aggravate the damage of the mechanical equipment, and even more serious, it will cause certain harm to the user. But don't worry, the manufacturer will polish the equipment before leaving the factory.

1. Flame polishing: the surface of water ring vacuum pump is softened, baked and impacted by fire to remove the twill and wrinkle on the mechanical surface, but this way will reduce the flatness of the unit surface;

2. Polishing with polishing powder: high speed friction is carried out on the surface of the unit to remove scratches on the surface of the unit, but there are many materials used in this method and the process speed is relatively slow;

3. Acid treatment and polishing: the surface of the unit is treated with acid. When this method is used for polishing, the lines on the surface of the unit may not be completely removed.

After polishing, the surface of the water ring vacuum pump will be smoother and easier for the user to operate. However, the user should pay more attention to their own safety problems, check whether there is a problem before using the equipment, and take safety precautions.

Water Ring Vacuum Pump In Grain Production Industry

Vacuum Pump System Classification

Vacuum Pump System In Medical Central Suction System

Can water ring vacuum pump pump pump water

Can water ring vacuum pump pump pump water

Water ring vacuum pump is a kind of vacuum pump which is installed in the water pump shell eccentrically with the impeller with blades. The impeller rotates in the pump shell to form a water ring, which acts as a piston and draws air by changing the volume to form a vacuum.

It can be seen that the water ring vacuum pump is to pump gas, not liquid. If the water ring pump is used as a liquid conveying machine, the liquid in the pump cavity of the water ring pump will not be removed in time, resulting in excessive pressure in the pump cavity, resulting in motor overload, motor phase loss, blocked exhaust and other components dragged by the impeller.

If it is necessary to pump out water vapor and water through water ring pump in the actual application process, a pre separator shall be arranged between water ring pump and heat exchanger, so as to separate gas and water, and then achieve the purpose of vacuum negative pressure pumping. So water ring vacuum pump can not be used alone to pump water.

Vacuum Pump For Cow Milking Machine

Liquid Ring Vacuum compressor

Water ring vacuum pump

Pumping speed and limiting pressure of roots pump

Pumping speed and limiting pressure of roots pump

Roots pump is a kind of positive displacement pump. Its pumping speed and limit pressure are constant for various gases. When the molecular weight of the extracted gas (he and H2) is lower than that of nitrogen, a slight increase in the leakage of the gap will cause a slight decrease in the pumping speed.

There is a maximum pumping speed in the range of 1-0.1 HPA of inlet pressure. In the case of higher hole and lower pressure, the pumping speed slightly decreases due to the larger effect of backflow. The cavity of roots pump is dry and oil-free, so the pressure corresponding to the pumping curve is full pressure.

The ultimate full pressure of roots pump unit is related to the type of pre pump selected. Generally, 0.001hpa is affected by the steam pressure of the pump oil of the front stage pump and the steam pressure of the lubricating oil at the gearbox and bearing.

The space with oil on Roots pump shall be connected with the vacuum side of the front stage, and the oil deterioration caused by the load of gear and bearing shall be removed by the front stage pump without any influence on the inlet of roots pump. When working at a higher pressure, a higher pressure difference will send oil through the shaft seal and into the pumped space. In order to avoid this phenomenon, a small vacuum pump can be set in the oil-bearing space to pump out, so as to ensure the cleanness of the pump cavity.

The lubricating oil of roots pump usually uses mechanical pump oil or diffusion pump oil with low steam pressure. Use diffusion pump oil under low load. When the liquid ring pump is used as the front stage pump of roots pump, the pumping speed and limit pressure of roots pump depend on the liquid used in the liquid ring pump. The limiting pressure of water ring pump is 20-30hpa, which depends on the temperature of water supply. The limit pressure of roots pump unit can reach 1 HPA, which is determined by the water vapor from water ring pump. If the front stage pump with gas injector is used, the limit pressure of roots pump unit is 0.1hpa. Because of the operation of the gas ejector, it has a blocking effect on the backflow of water vapor.

Generally speaking, it is more common to use a Roots pump and a single-stage front-end pump group to become a unit, but when lower dangerous pressure and higher pumping speed are required, it is often used to combine multiple roots pumps in series and then add the front-end pump to form a unit.

Rotary Vane Vacuum Pump

Roots Vacuum Pump

Dry Type Oilless Vacuum Pumps