Failure caused by corrosion of centrifugal pump and water ring vacuum pump

Centrifugal pump and water ring vacuum pump are the power components of spraying truck. Under the joint action of centrifugal pump and water ring vacuum pump, liquid is pumped from liquid source or charging bucket and transported to the charging bucket or outside. Therefore, centrifugal pump and water ring vacuum pump are the parts that contact water or detergent most. Meanwhile, the rotating speed of centrifugal pump is up to 2000r / min, Under the combined influence of the scouring action of the washing fluid with particles and the cavitation of the fluid, it is easy to produce corrosion and various faults. 

For example, due to corrosion between the pump cover and the pump body, it is easy to leak liquid or the fixed nut is rusty, which is not easy to disassemble and install. The corrosion of the inner wall of the pump body and the impeller of the centrifugal pump affects the rotation of the impeller, or the temperature is too high due to friction, and the noise of the centrifugal pump is too high; the pump shaft is corroded under the action of the detergent, and the strength is reduced, resulting in the loose fixation of the impeller; the inner wall of the pump body and the impeller of the water ring vacuum pump are loose At the same time, corrosion affects the rotation of the impeller, or the temperature is too high due to friction, and the phenomenon of excessive noise of centrifugal pump; the leakage of liquid and air at the connection part of inlet pipe and exhaust pipe between centrifugal pump and water ring pump affects the filling of water.

Liquid Ring Systems

Rotary Vane Vacuum Pump

Dry Scroll Vacuum Pump 

Test of vacuum pump

Any pump to be repaired, repaired or a new pump shall be tested for any fault, the form and position of the fault, the ultimate vacuum degree and the time that can be reached, and the pumping rate shall be identified if conditions permit. 

1. Clean all parts of the pump to remove oil and dirt. Take off the belt and use the reverse switch to test the positive and reverse rotation of the motor, so that its direction of rotation is consistent with the direction of the arrow marked on the pump wheel. If there is no mark on the pump wheel, press the air inlet of the pump with the palm of your hand and turn the pulley with the other hand. When you feel the inward suction, the rotation direction of the pulley is the correct direction, and mark it. Then install the belt and connect the test device at the air inlet of the pump before starting the pump. Usually, one end of the vacuum rubber tube is inserted into a thermocouple tube, and the other end is inserted into the air inlet of the pump to be tested. Before that, a little castor oil should be applied on the rubber pipe mouth to make it lubricated and easy to insert and remove. The rubber pipe is clamped with iron clip (if metal pipe is connected, it is connected to the pump port with flange plate, and the other end is sealed with metal glass to connect to the gauge pipe or gauge pipe joint, and there is a vent valve in the middle of the pipe). First turn the pulley by hand for several turns. If there is no big obstacle, the motor can be started intermittently. Make the pump run normally.

2. Check the operation of the pump: listen to the pump sound for noise and abnormal sound; see how the valve plate of the air port is beating; whether the oil reaches the center of the oil standard; whether there is oil leakage, air leakage and water leakage; check whether the surface of the pump cavity is deformed, and make records one by one.

3. Use high frequency spark leak detector and thermocouple vacuum gauge to check the change of vacuum degree. When the spark hits the neck of the gauge (not on the gauge), the vacuum can be judged by the glow color; normally, after the pump is turned on, the glow color will gradually change from dark purple and rose red to light blue, until the glow is very small, and only the fluorescence of glass can be seen. At this time, the vacuum degree is high. After the glow turns to light blue, a thermocouple vacuum gauge can be used to monitor the vacuum. At the beginning, it can also be measured by thermocouple vacuum gauge alone. But do not do both at the same time to avoid damaging the thermocouple gauge. If the spark detector moves back and forth on the glass tube during the inspection, no glow can be produced, and the spark can drill into the glass tube into a linear shape, indicating that the vacuum degree is very low (close to atmospheric pressure). If it is always purple, the vacuum degree of the pump is not high, should carefully check the various parts of the pump, to see whether there is leakage of rubber pipe joints and other places. If the thermocouple tube has certain indication when measuring the vacuum degree, it can clamp on the iron clamp or stop the pump suddenly for a short time to record the pressure change curve with time to judge whether it is caused by poor pump or air leakage. It is necessary to distinguish the different situations of leakage, deflation and pump damage, and make a careful judgment.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump 

Advantages of vacuum pump oil in use

The main advantages of vacuum pump oil are small clearance, less leakage, high compression ratio, stable pumping speed in a wide range of crude force and wide working pressure range; as the volume of the compression chamber changes continuously, the driving torque change is small, the power change is small, the vibration noise is low, and the reliability is high. This is not available for other types of dry vacuum pumps. 

The problems of oil leakage, noise, oil return pollution, high energy consumption and vibration of ordinary vane oil pump have adverse effects on users, such as oil vapor pollution in biological products industry and semiconductor industry and oil return valve problem in process system. In the coating process of vacuum coating equipment, if the ordinary oil-free vertical vacuum unit is used as the vacuum pump oil in the front stage when coating under 20 ~ 40Pa vacuum condition, the coating process equipment will be polluted and the film forming quantity will be affected.

There is a gap of 509l between using oil pump and using dry pump in semiconductor chip manufacturing process, and the discharged oil mist vapor also pollutes the environment. In particular, the use of oil pump test instruments will cause adverse effects in the industry. The vortex oil-free vacuum pump used in large synchrotron radiation beam line as the front stage vacuum pump is also quite obvious. In addition, the oil-free vertical vacuum unit eliminates the environmental pollution and trouble caused by the oil leakage of ordinary oil pump.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces 

Rolling bearing assembly in vacuum equipment

No matter what kind of mechanical equipment and vacuum pump assembly, will encounter the assembly of common parts and special parts, respectively described. 

Assembly of rolling bearing: when rolling bearing is fitted with interference fit, the bearing race will deform. For example, if the diameter of the inner ring increases, the diameter of the outer ring decreases, thus reducing the radial clearance between the raceway surface of the race ring and the ball. If the installation is not correct, the clearance will be too small, so the bearing ball may be stuck, affecting the normal operation of the bearing.

There should be no clearance between the bearing inner ring and the shaft and between the outer ring and the bearing box, because the shaft cannot reach the required centering accuracy.

Generally, the heating temperature of bearing can be selected in the range of 60 ~ 100 ℃, because the tempering temperature of bearing is between 150 ~ 180 ℃. If the heating temperature exceeds 100 ℃, it is easy to cause tempering. Put the heated bearing on the shaft quickly and tap it in with a hammer.

When the outer ring of the bearing is turned by hand, the assembled rolling bearing should be smooth without jamming and noise. Also use a feeler gauge to check whether the contact between the end face of the seat ring and the shaft shoulder is tightly attached to the shaft shoulder, and at the same time, it does not resist the chamfering. The deflection of the bearing on the shaft is a serious defect, which should be solved by investigating the causes.


Roots Blower For Aerating Fish Pond

Ionization Vacuum Gauge Calibration Notes

What Is The Medium Conveyed By Roots Blower 

sputtering ion pump type selection

When the inert gases such as argon, krypton and xenon are eliminated by the two-stage sputtering ion pump, the argon pressure will rise and then decrease suddenly in the vacuum system, and the pressure change range is 10-2 PA. This phenomenon is called argon instability. The instability of argon in two-stage ion pump after exhausting for hundreds of hours at 10-3pa or thousands of hours at 10-4Pa is given. In order to overcome this phenomenon, several improved structures of various improved sputtered ion pumps have been developed 

The structure of bipolar pump is simple, the magnetic gap of magnet is small, but the starting pressure is low. If it is not started under high pressure and there is no special requirement for inert gas pumping speed, it is better to choose this kind of pump.

If high starting pressure is required, tripole structure or other auxiliary methods can be used. The process of triode structure is complex. If it is tripotential, the power supply is also complex. The magnetic gap of the magnet is also large.

Roots Blower For Desulfurization And Denitrification

Oil Less Rotary Vane Type Vacuum Pump Use Points

Roots Blower Used In Flour Mill 

Vulnerable parts of reciprocating vacuum pump

Reciprocating vacuum pump has great advantages in the market competition, but users often encounter some problems of replacement of vulnerable parts in use. The following is a simple list of vulnerable parts of reciprocating vacuum pump for users to choose: 

Piston rod copper sleeve, crosshead, crosshead pin, connecting rod copper sleeve, piston rod packing, connecting rod bearing bush, piston ring, big and small spring, straight cylinder spring, orifice valve piece, five hole valve plate, etc. the above products are vulnerable parts of W-type reciprocating vacuum pump. As long as the normal maintenance, regular inspection and replacement of vulnerable parts are required for a normal reciprocating vacuum pump, the general service life can reach 7-10 years.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump 

Principle of pumping liquid with water ring pump

When pumping liquid, the process of suction is the same as that of gas. On the left side of the sickle shaped space of the pump (the side of the pressure outlet), the speed of the liquid is increased due to the decrease of the water cross section. 

According to Bernoulli's equation, when the speed increases, the pressure will decrease. When the liquid continues to flow forward and flows to the pressure outlet, the pressure will increase suddenly. As a result, the liquid passing through the pressure outlet will be obstructed and the speed will be slowed down. The sudden increase of pressure and deceleration will bring huge hydraulic loss, so the efficiency of water ring pump in pumping liquid is very low (compared with that of pumping gas) The efficiency is not more than 15 ~ 20%, because of the huge hydraulic loss and the "water conveyor effect" (when the liquid flows to the pressure outlet area, the liquid flows from the place with large radius to the place with small radius, and the liquid transfers its own energy to the impeller, just like the water conveyor), in fact, the head is much smaller. The head of water ring pump is smaller than that of centrifugal pump of the same size.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump

Vacuum system of pumping steam

In the process of vacuum impregnation, vacuum drying and vacuum freeze-drying, the gas extracted from the vacuum system is mainly steam and other condensable steam, and the working vacuum degree is mostly 10 ~ 10-1pa. In foreign countries, roots pump and oil seal mechanical pump are usually used for air extraction. For this reason, in recent years, the maximum inlet pressure of water vapor is the index of foreign oil sealed mechanical pumps (usually 103 ~ 3 × 103pa), while the domestic oil sealed mechanical pumps generally do not have this index. Moreover, the check function of some mechanical pumps equipped with air ballast valve is not strong, and the gas ballast effect is not obvious, which can not achieve the purpose of large amount of steam pumping, resulting in a large amount of steam condensation in the pump oil, Oil and water mixed to form white emulsion, reducing the sealing and lubricating performance of mechanical pump. The corrosion liquid will cause rust inside the pump body, and the rusty iron powder will fall into the oil and become reddish brown, and circulate in the pump together with the pump oil, which will have adverse effects on the service life and limit vacuum degree of the pump. 

(1) The steam jet pump is suitable for the vacuum system with large displacement, and the system needs to be equipped with working steam source.

(2) Oil booster pump + oil seal mechanical pump, the system is not suitable for the gas phase drying of transformer, especially in the oil booster pump, the naked electric furnace is strictly used, otherwise the open fire is easy to cause explosion accident.

(3) ZJ Roots pump + ZJ Roots pump + double stage water ring vacuum pump, the pumping system can obtain higher limit vacuum degree and larger displacement. However, the investment cost of the system is high, and it is easy for the working fluid of the water ring pump to flow back into the vacuum container, and the pumping efficiency of the water ring pump is low, and the unit power consumption is 50% higher than that of the slide valve pump. For example, various types of roots water ring vacuum unit.

(4) Slide valve pump + water ring pump or ZJ Roots pump + slide valve pump + water ring pump, because the slide valve pump is equipped with a front stage pump (water ring pump) in the system, so its compression ratio is reduced, so the water vapor is rarely condensed in the slide valve pump, but there is still a defect in Item 3.

(5) ZJ Roots pump + rotary vane vacuum pump is equipped with high-efficiency gas ballast valve, reliable oil-water separator and reasonable design of lubrication system, so that the system can operate continuously at the inlet steam pressure of 3000pa. This is an economical and reliable vacuum system for pumping steam abroad in recent years. For example, various types of rotary disc vacuum unit.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump 

Vacuum coating technology of water ring vacuum pump

The vacuum coating of water ring vacuum pump is a kind of technology to produce film material by physical way. This technology can protect the vacuum pump equipment and reduce its damage. However, many people may not understand this, so the following small series to give you a detailed introduction of the product's vacuum coating technology. 

Vacuum coating technology is separated from the heating source to the surface of the pump, so it is also an important branch of water ring vacuum pump application technology. It has been widely used in optics, electronics, energy development, physical and chemical instruments, construction machinery, packaging, civil products, surface science and scientific research and other fields. The main methods of vacuum deposition are evaporation, sputtering, ion plating, beam stacking and molecular beam epitaxy. In addition, there are chemical vapor deposition methods.

If the purpose of vacuum coating is to change the physical and chemical properties of the surface of water ring vacuum pump, this technology is an important part of the surface treatment technology of water ring vacuum pump. This paper introduces its main application. In terms of optics, a piece of optical glass or quartz coated with one or several layers of thin films of different substances can become highly reflective or non reflective (i.e., antireflective film) or any expected proportion of reflection or transmission data, and can also be used as a filter for absorbing certain wavelengths and transmitting for another wavelength.

The high reflective film of water ring vacuum pump is in great demand, starting from large aperture astronomical telescopes and various lasers, to large window coated jasmine of new buildings. Antireflective coatings are widely used in photography, laser start, and large window coated glass of new buildings. Antireflective coatings are widely used in cameras and television cameras. Vacuum coating plays an important role in electronics. Various ranges of inherited circuits. The conductive film, insulating film and maintenance film should be used for memory, arithmetic unit and notification logic element. As a mask for the preparation of the circuit, chromium film is used.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump 

What are the characteristics of oil-free vacuum pump

The ambient temperature of oil-free vacuum pump should be less than 40 ℃ and the temperature rise of motor should not exceed 75 ℃. After 1000 hours of normal operation of the magnetic pump, the bearing and end face moving ring shall be disassembled and inspected for wear, and the wear parts that can not be reused shall be replaced. For the medium that is easy to precipitate and crystallize, the conveying liquid shall be cleaned immediately after use to drain the liquid in the pump. The vacuum pump should always be kept clean, no other objects should be placed on the vacuum pump, and the channel around the pump should not be blocked for better maintenance and operation. 

Oil free vacuum pump is widely used in vacuum distillation, evaporation, crystallization, drying and filtration in petroleum, chemical, food, pharmaceutical and other fields.

Due to the selective pumping of oil-free vacuum pump, sometimes one kind of pump can not meet the requirements of air extraction, and several pumps need to be combined to supplement each other to meet the pumping requirements. For example, the titanium sublimation pump has a high pumping speed for hydrogen, but can not pump helium, and the three type sputtering ion pump has a certain pumping speed for argon. The combination of the two will make the vacuum device have a good vacuum degree. In addition, some vacuum pumps can not work under atmospheric pressure and need pre vacuum; some vacuum pump outlet pressure is lower than atmospheric pressure, need front pump, so all need to combine the pump.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces 

Combination of vacuum pump units in semiconductor industry

In semiconductor industry, roots vacuum pump and dry pump are used in vacuum unit. On the one hand, it can reduce the size of dry pump, on the other hand, it can obtain larger pumping speed in medium vacuum range.

Because the bearings and synchronous gears of Roots vacuum pump need to be lubricated, the lubricating oil will pollute the vacuum process. The solution is to connect a section of vacuum pipeline on the end cover of the gearbox, and use another auxiliary vacuum pump to pump the pressure in the gearbox lower than the inlet pressure of roots pump, as shown in Fig. 1.

In this way, under this pressure gradient, the oil vapor in the gearbox will not enter the pump cavity through the labyrinth shaft seal and cause pollution. In addition, when roots vacuum pump removes harmful gas, the seal of motor drive shaft must not leak, so shielding motor roots pump appears, which does achieve zero leakage.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

dry screw vacuum pump market potential

dry screw vacuum pump market potential

At present, the application of dry screw vacuum pump is very extensive, and the demand is infinite, so the development prospect of dry screw vacuum pump is also excellent, mainly from these aspects. The development prospect of the total dry screw vacuum pump is very good.

In the future, for the oil industry in oil production, oil transportation and oil refining, the demand for high-efficiency water injection pump, heavy oil pump, oil pipeline pump and screw pump will increase greatly, and the demand for different types of industrial pumps will be about 140000-150000 sets. For the three chemical pumps, the market for large-scale fertilizer Methylamine Pump, large and medium-sized high-temperature and high-pressure magnetic pump, and special material non-metallic chemical pump will also expand, and the demand for all kinds of chemical pumps will be 100000-120000.

At present, the model of dry screw vacuum pump is used in many working occasions. The whole adaptability of dry screw vacuum pump is strong and its efficiency is high. Recently, the design trend of dry screw vacuum pump is mainly designed for specific working conditions, which is more targeted, and the designed screw pump has high efficiency.

Dry screw vacuum pump is widely used in many industries, such as chemical plants, mines, pharmaceutical plants, food factories and so on. Now, the application of dry screw vacuum pump is very extensive, the demand is infinite, so the development prospect of dry screw vacuum pump is excellent, mainly from these aspects.

1、 With the development of industry, the application of dry screw vacuum pump is larger, and the service life of dry screw vacuum pump is longer;

2、 This kind of dry screw vacuum pump is a better one at present. It will be used for a long time in the future, and it is unique. It is difficult to replace other equipment.

industrial vacuum pumps,vacuum furnaces
Roots vacuum pump
Liquid Ring Vacuum compressor

Oil lubricated screw vacuum pump

GL series is a series of new intelligent and efficient vacuum pumps, which are driven with variable speed. The "plug and play" and recognized anti vacuum pumps designed on the basis of these principles, vacuum is the most common in industrial applications where the Engineer provides performance at maximum working pressure. provides a global uniform system.

Characteristic:

Reduce the area occupied;

Ultra low back pressure, low power consumption; in about 50% reduction of energy consumption, leading technology, variable speed drive and innovative design combine to provide a significantly increased performance of engine efficiency and reduced life cycle cost compared to dry vane vacuum pump lubricating oil; quiet running noise level data corresponds to about half of the technology; due to the sustainable productivity Comprehensive efficiency of sustainable development. In accordance with commitments on energy management and environmental issues / 14001 ISO 50001;

Reduce the impact on the environment, as very high oil maintains the maximum pressure from atmospheric pressure at all working pressures;

VACUUM FURNACE

industrial vacuum pumps,vacuum furnaces

Heat treatment equipment