Impeller adjustment of vacuum pump

Impeller adjustment of vacuum pump

When it comes to 2BV vacuum pump, I believe that friends who have learned about our website will not be unfamiliar, but do you know the mediation of 2BV vacuum pump impeller? Here is a detailed introduction:

In order to ensure the efficient operation of 2BV vacuum pump, it is necessary to adjust the clearance between the impeller of 2BV vacuum pump and the front guard plate in time. The clearance between the impeller of metal lined pump and the front guard plate is between 0.5-1mm, and the clearance between the impeller of rubber lined pump and the front and rear sheath is equal. When adjusting the impeller clearance of 2BV vacuum pump, first stop the pump, loosen the bolts that compress the bearing assembly, screw the nuts on the adjusting bolts to move the bearing assembly forward, and at the same time rotate the shaft by hand according to the rotation direction of the pump until the impeller of 2BV vacuum pump rubs against the front guard plate.

For the metal lined pump, loosen the nut just tightened at the front by half a turn. Then tighten the nut at the front of the adjusting bolt to move the bearing assembly backward. At this time, the clearance between the impeller and the front guard plate is 0.5-1mm. For the rubber lined pump, screw the nut on the adjusting bolt to move the bearing assembly of the 2BV vacuum pump forward first, so that the impeller contacts the front shield. When the bearing assembly moves backward, so that the impeller contacts the rear shield, measure the movement of the total 2BV vacuum pump of the bearing assembly. The distance is generally taken as the clearance between the impeller and the front and rear sheath. Then adjust the position of the bearing assembly with the adjusting bolt to ensure the correct clearance between the impeller and the front and rear sheath. After adjustment, before starting again, it is necessary to recheck whether the impeller of 2BV vacuum pump rotates normally, whether the compression bolt of bearing assembly is tightened with the adjustment bolt, and then start the 2BV vacuum pump.

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Vacuum coating technology of vacuum pump

Vacuum coating technology of vacuum pump

What do you know about the knowledge of 2BV vacuum pump? You often use it. You should know about its vacuum coating technology. Here is the introduction of the vacuum coating technology of 2BV vacuum pump:

Vacuum coating technology is an important branch of 2BV vacuum pump application technology. It has been widely used in optics, electronics, energy development, physical and chemical instruments, construction machinery, packaging, civil products, appearance science and scientific research. The main methods of vacuum coating are evaporation, sputtering, ion plating, beam stacking and molecular beam epitaxy. In addition, there is chemical vapor deposition.

If the purpose of vacuum coating is to change the physical and chemical properties of the material surface, this technology is an important part of the vacuum surface treatment technology. Now I will give a brief introduction to its main application. First of all, in terms of optics, a piece of optical glass or quartz coated with one or several layers of films of different substances can become a high reflection or no reflection (i.e. antireflection film) or any expected proportion of reflection or transmission data, and can also be used as a filter for absorption of a certain wavelength and transmission of another wavelength.

High reflective films are needed from large-diameter astronomical telescopes and various lasers to large window coated Jasmine in new buildings. Antireflective film is widely used in photography, laser start, and new building window coated glass, which are in great demand. Antireflection film is widely used in camera and television camera lens. Vacuum coating plays an important role in electronics. Various range of inheritance circuits. Including memory, arithmetic unit, notification logic element, etc. all need to use conductive film, insulating film and maintenance film. As the mask of the circuit, chromium film is used.

ZJ Roots Vacuum Pump

ZJP Roots Vacuum Pump

air-cooled roots-liquid ring vacuum system

Wear factors of SK vacuum pump

Wear factors of SK vacuum pump

Sk vacuum pump in a long time of high-speed operation, it is inevitable that there will be wear. If the wear is serious, the efficiency of vacuum pump will be affected. Therefore, we should pay attention to avoid the occurrence of wear factors as much as possible in the process of using the equipment. Let's analyze the wear factors for you.

The wear of the journal surface of SK vacuum pump is uneven. The radial wear of the main journal and the connecting rod journal is mainly elliptical, which corresponds to the wear part, that is, the wear part of each main journal is close to the side of the connecting rod journal, and the wear part of the connecting rod journal is also close to the side of the main journal. The crankshaft journal has conical wear along the axial direction. The elliptical wear of the journal is caused by the uneven distribution of the force acting on the journal in the circumferential direction

When the engine is working, the comprehensive force on the connecting rod journal always acts on the inner side of the connecting rod journal, and the direction is outward along the crankshaft radius, resulting in the large wear on the inner side of the connecting rod journal, forming an ellipse. The reason for the tapered wear of the connecting rod journal is that the oil passage leading to the connecting rod journal is inclined. When SK vacuum pump rotates, under the action of centrifugal force, the mechanical impurities in the lubricating oil accumulate on one side of the connecting rod journal, which accelerates the wear of the journal and makes the wear of the connecting rod journal tapered.

In addition, the bending of the connecting rod, the non perpendicularity of the cylinder center line and the SK vacuum pump center line and other reasons will make the axial force on the journal uneven, and cause the wear deflection. The wear of the main journal is elliptical, mainly due to the influence of the centrifugal force of the connecting rod, the connecting rod journal and the crank arm, so that the relative wear between the side near the connecting rod journal and the bearing is greater. In addition, the journal surface may be scratched and burned. Scuffing is mainly caused by unclean engine oil, in which large hard mechanical impurities are scratched on the journal surface. The burn of the journal surface is caused by the burning of the bearing. The burning of the bearing is mainly caused by insufficient lubrication, too thin oil, blocked oil circuit and other reasons.

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Inlet pipe of vacuum pump

Inlet pipe of vacuum pump

Generally, in the process of vacuum pump installation, many people change the inlet diameter of the equipment at will for the convenience of installation. The consequence is that it is easy to cause great use impact in the later production.

We'd better not change the size of each part of the vacuum pump at will. It's manufactured and installed at will after the designer's research in production. It will have a bad impact on the vacuum pump in the future use.

If the inlet size is reduced, the flow rate of the pump will increase, and the flow loss will increase accordingly. In addition, there may be serious cavitation problems caused by eddy current. When the rotating speed is high, it will cause vibration of the pipeline and aggravate the progress of cavitation. Because of the existence of vibration, the operation of the vacuum pump will be unbalanced and easy to cause leakage. Therefore, when piping, we should configure the corresponding pipes according to the factory standard of the manufacturer to avoid unnecessary troubles.

Therefore, when installing the vacuum pump, we must install it in accordance with the operating instructions. We can't change it at will, which will cause inconvenience in later use and safety in production.

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Oilless Vacuum Pumps

Liquid Ring Vacuum compressor

How to mark the vacuum degree of water ring vacuum unit

How to mark the vacuum degree of water ring vacuum unit

The vacuum degree value in water ring vacuum unit refers to the value that the actual pressure value in the negative pressure station is lower than the atmospheric pressure, which is usually marked by the following two methods:

1. Mark with "absolute pressure" and "absolute vacuum degree": in the actual situation, the absolute pressure value of water ring vacuum unit is between 0 and 101.325kpa, which needs to be measured by absolute pressure instrument. In the place of 20 ℃ and zero altitude, the initial value of the instrument used to measure the vacuum degree is 101.325kpa.

2. Use "relative pressure" and "relative vacuum degree" to identify: "relative vacuum degree" refers to the difference between the pressure of the tested object and the atmospheric pressure of the measurement site. Use a common vacuum meter to measure. Under normal pressure, the initial value of the meter is 0. When measuring vacuum, its value is between 0 and - 101.325kpa.

Water ring vacuum unit can not only save water source, but also reduce environmental pollution. It is flexible and convenient to install. It is widely used in occasions where vacuum source is frequently used and the required air volume is not too large.

Water ring vacuum pump

Open Cycle Water Ring Vacuum System

Closed Cycle Water Ring Vacuum System

vacuum pump of working principle

vacuum pump of working principle

You must be familiar with the vacuum pump, but you may not know its working principle. Let's introduce it to you and have a look.

1. During the operation of the vacuum pump, due to the centrifugal force, water forms a closed ring of approximately equal thickness, which is determined by the shape of the pump cavity. The inner surface of the upper part is just tangent to the impeller hub, and the inner surface of the lower part is just in contact with the top of the blade (in fact, the blade has a certain insertion depth in the water ring).

2. A crescent shaped space is formed between the impeller hub and the water ring, and this space is divided into several small cavities with equal number of blades by the impeller. If the upper 0 ° of the impeller is taken as the starting point, the volume of the small cavity will increase from small to large when the impeller is 180 ° before rotation, and it is connected with the suction port on the end face. At this time, the gas will be sucked in. When the suction is finished, the small cavity will be isolated from the suction port. When the impeller continues to rotate, the small cavity will decrease from large to small, so that the gas will be compressed. When the small cavity is connected with the exhaust port, the gas will be discharged from the stainless steel vacuum pump. Outside the pump.

Vacuum pump has its unique advantages and advantages. It has been widely used in food vacuum packaging, medicine, printing machinery paper transportation, glass industry transportation, vacuum fixture, drying and other units.

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Vacuum System In Heavy Steel Industry

Oil Free Vacuum Pump Type

Cavitation phenomenon of liquid ring vacuum pump

Cavitation phenomenon of liquid ring vacuum pump

When the liquid ring vacuum pump is working, at a certain temperature, when the liquid pressure at the low pressure is lower than the vaporization pressure (i.e. saturated steam pressure) at that temperature, the liquid starts to vaporize and generate bubbles. When the liquid enters the high pressure area, the bubbles break, and the surrounding liquid quickly fills the original bubble holes, generating hydraulic impact. The generation, development and rupture of bubbles are called cavitation.

In the working process of the liquid ring vacuum pump, the absolute pressure of the suction area is consistent with the absolute pressure of the pumped system. In other words, the higher the vacuum degree of the system being pumped, the higher the vacuum degree of the suction area.


Liquid ring vacuum pump needs liquid as working medium. Each liquid has a corresponding saturated vapor pressure at a certain temperature. When the absolute pressure in the suction area is closer to the saturated vapor pressure of the liquid, the liquid is closer to boiling state. At this time, there will be a large number of bubbles on the surface of the working fluid in the suction area. Because the working fluid steam generated by the liquid in the working cavity will occupy part of the working cavity space, the external suction capacity of the pump will be reduced. When the pressure in the suction area reaches the saturated steam pressure of the working liquid, it can be considered that the working cavity is full of working liquid steam. At this time, the suction capacity of the pump is close to 0, and the cavitation phenomenon of the pump is the most serious.

If the working fluid is water, the higher the water temperature is, the more the pumping performance of the pump will decline. The principle of cavitation damage of liquid ring pump is the same as that of centrifugal pump. It is at the place where bubbles are produced and broken. Pitting occurs on the metal surface and honeycomb damage will occur seriously. If there is a large residual stress in the cavitation part of the vacuum pump impeller, it will cause stress release and crack.

Because of the pump cavitation, the bubble in the high-pressure area of continuous sudden rupture, and accompanied by a strong water hammer, resulting in noise and vibration. You can hear the crackling like peas. The experimental results show that the vibration frequency range is 600-25000hz and the pressure is 49MPa.

If the above bubbles break on the metal surface, the metal surface will be subjected to continuous and strong water hammer, and there will be pockmarks, the metal grains will loosen and peel off to form honeycomb, or even perforation. In addition to mechanical action, cavitation damage is accompanied by many complex actions such as electrolysis and chemical corrosion. The actual damage shows that the location of cavitation damage of pump flow passage parts is the place where bubbles disappear.

Liquid Ring Vacuum Pump

Liquid Ring Vacuum compressor

Water ring vacuum pump