Selection of water ring vacuum pump model

Try to select the standard with lower rotation speed. On the premise of reaching the same pumping volume, try to select the pump with lower rotation speed. The larger pump consumes less specific power, that is, higher power. In addition, the larger standard water ring vacuum pump has long blades (that is, long flow channel), small curvature of fluid, approximate straight streamline, and fluid activity is close to slow flow. 

Considering the influence of water temperature, the temperature of most make-up water is between 25 ℃ and 35 ℃. Therefore, when selecting pumps, the air volume should be appropriately increased compared with that in the technical documents. When installing pipelines, a thicker suction pipe should be selected to reduce the loss of resistance, and a right angle elbow should be cut as far as possible to improve the suction work The intention of the rate.

When the exhaust pressure is slightly positive, the influence of the increase of the exhaust pressure and the increase of the backflow in the pump cavity on the pumping volume should be considered. Because the increase of the exhaust pressure will increase the shaft power of the pump and the power of the driving machine, the experimental function curve and the corresponding skill data should be referred to in the selection to fully meet the requirements.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump 

Mechanical seal screw vacuum pump with external cooling device

 The utility model discloses a mechanical seal screw vacuum pump with an external cooling device, which comprises two screw rotors and an input shaft driving the two screw rotors to rotate. The two ends of the screw rotor are provided with a mechanical seal, the extension of the input shaft and the atmospheric side are provided with a mechanical seal; the mechanical seal part is provided with a cooling cavity; the screw vacuum pump is provided with a device for taking away the heat of the mechanical seal The external cooling circulating device is a circulating circuit composed of oil tank, oil pump and oil separator. 

Compared with the prior art, the vacuum pump of the utility model adopts mechanical seal and forced circulation cooling, which completely blocks the leakage between the front of the pump and the cooling chamber as well as between the cooling chamber and the atmosphere; the external circulation cooling device forces the mechanical seal to cool down, with low working temperature and sufficient lubrication, which increases the service life and reliability of the overall transmission parts, and has the advantages of low energy consumption, good cooling effect and safe operation It is fully reliable.

Roots Blower In River Aeration Treatment

Rotary Vane Vacuum Pump

Dry Scroll Vacuum Pump

dry vacuum pump structure and characteristics

Vacuum pump is a device or device that uses mechanical, physical, chemical or physicochemical methods to exhaust the pump to get vacuum. Dry vacuum pump users in the application of vacuum pump knowledge need to master the following structure and characteristics, hope to help you. 

The configuration of the vacuum pump body determines the overall structure of the pump. The entrance and exit are arranged in a horizontal and vertical structure for easy assembly and cable connection. However, the center of gravity of the pump is high, the stability of high-speed operation is poor, so this type is used for small pumps.

The horizontal pump is at the suction port and the exhaust port is below. The piping of the vacuum system is easy to install and connect, sometimes it can be discharged from the horizontal direction of the exhaust. That is to say, the exhaust directions are perpendicular to each other. At this time, in addition to the bypass valve at the other end of the exhaust pipe, the exhaust port can also be opened from left to right. The pump structure has low center of gravity and high speed stability. Generally speaking, large and medium pumps use this structure.

The two rotor shafts of the pump are installed perpendicular to the horizontal plane. The structure is easy to control the assembly clearance, the rotor is easy to install, and the pump area is small. However, the center of gravity of the pump is the height and the disassembly of the gear, and the lubrication mechanism is also very complex.

industrial vacuum pumps,vacuum furnaces

Rotary Vane Vacuum Pump

Dry Scroll Vacuum Pump

The reason why single stage centrifugal pump can't pump water

Although the single-stage centrifugal pump has a certain degree of self-priming capacity, it is still necessary to ensure that the inlet pipe is completely sealed when it is installed. 

The reason why the centrifugal pump does not pump water may be that the user does not install it correctly. The correct installation and use of centrifugal pump suction pipe should be installed at the bottom of the pool bottom valve. Before starting, the whole pump body and inlet pipe must be filled with water. The outlet valve must be closed before starting, and then the outlet valve shall be opened slowly after opening the centrifugal pump. Each single-stage centrifugal pump has different self-priming performance according to different models. When choosing the model, you must know each single-stage centrifugal pump.

The reason why the single-stage centrifugal pump can not pump water may also be that the self-priming exceeds the effective self-priming height of the centrifugal pump. The self-priming head of conventional single-stage centrifugal pump is within 3M. If the height exceeds this height, self-priming centrifugal pump or high suction self-priming pump with vacuum auxiliary device must be used.

The reason why the single-stage centrifugal pump can not pump water may also be due to the blockage of debris in pump cavity, impeller, bottom valve, pipeline and other places. If the single-stage centrifugal pump is sealed and has leakage, it will also lead to the failure of pumping.


CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump

How to use screw vacuum pump

Screw vacuum pump will be affected by air leakage in the process of use. Many users think that this is a quality problem of the equipment, which has been replaced by new equipment. However, the cause of air leakage is not only the quality problem, but also the front and rear covers are different? In other words, the front and rear covers of the screw vacuum pump have different axial degrees, and the result is the same as the bearing deflection. 

With the increase of the liquid ring temperature, the saturated vapor pressure also increases, which reduces the vacuum degree of the screw vacuum pump, but has no effect on the exhaust pressure? Tighten the connecting bolts and stuffing box of the screw vacuum pump, tighten the connection between the pipeline, instrument and other parts, or replace the gasket and stuffing.

For the leakage of the screw vacuum pump, putty can also be used as a temporary remedy to make the bearing deflect, so that the impeller inclines and is installed in the pump body of the screw vacuum pump. The axial clearance of single acting pump is uneven. When the impeller rotates, the side cover must have certain friction, and the side cover and the impeller end face will be scratched.

When the gas in the compression chamber passes through the increased gap, the axial gap increases, and a large amount of gas leaks into the suction chamber, thus reducing the vacuum pressure or discharge pressure of the screw vacuum pump. At this time, the bearing of screw vacuum pump must be removed for maintenance, and then installed correctly. Screw vacuum pump is a kind of pump device, which completes the suction and exhaust work produced by synchronous high-speed reverse rotation in the pump shell.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump

Causes of crankshaft wear of Roots vacuum unit

After using roots vacuum unit for a period of time, the problem of crankshaft wear often occurs. The wear is uneven. The radial wear of main journal and connecting rod journal is mainly elliptical, while the axial wear of crankshaft journal is mainly conical. So, how are these crankshaft wear caused? 

1. Because the oil passage leading to the connecting rod journal is inclined, under the action of centrifugal force, the mechanical impurities in the lubricating oil accumulate on one side of the connecting rod journal under the action of centrifugal force, which accelerates the wear of the Journal on this side and makes the wear of the connecting rod journal cone-shaped.

2. Because of the bending of connecting rod, the center line of cylinder is not perpendicular to the center line of crankshaft, the axial force on the journal is uneven and the wear deflection is caused.

3. The elliptical wear of the journal is caused by the uneven distribution of the force acting on the journal along the circumference. When roots vacuum unit is working, the combined force on the connecting rod journal always acts on the inner side of the connecting rod journal, and the direction is outward along the radius of the crankshaft, resulting in wear on the inner side of the connecting rod journal.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump 

Market of vacuum pump

Vacuum pump is a kind of widely used product with large output and low output value, but it directly affects the performance and quality of vacuum equipment. 

The market of vacuum pump changes dynamically according to the needs of users. The main driving force of market growth comes from the rapid development of semiconductor industry and the increasing application of dry pump and molecular pump. 

There are many vacuum pump manufacturers in China, and the annual sales of all vacuum pumps are about 150 million yuan, which is only equivalent to the annual sales of a vacuum pump in an American company. Through the analysis of the global vacuum pump market, we can see that the market and application fields of various vacuum pumps are constantly changing and developing. China's vacuum pump manufacturing industry has a long history and strong foundation. Domestic real pumps have been applied and verified in various fields. Some pumps have been exported to foreign countries, and have been recognized and praised by foreign users. It should be said that China's vacuum pump manufacturing industry still has a huge development space at home and abroad.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump 

What are the principles of rotary vane vacuum pump

The rotary vane vacuum pump is a series connection of the main pump and the former stage pump. The rotary vane vacuum pump selects the rotary vane pump as the front stage pump, so it overcomes the defect of low pumping rate of rotary vane vacuum pump under certain pressure when it is in use, and retains the advantages of roots pump, such as agile operation and relatively large pumping rate.

Because of its compact structure and small floor area, rotary vane vacuum pump can replace multiple mechanical vacuum pumps. Therefore, rotary vane vacuum pump units are widely used in vacuum training, power capacitor, transformer vacuum heat treatment, vacuum coating equipment pre pumping, electric vacuum semiconductors and other occupations, which will not react with pump oil and contain no particulate dust.

Next, I'd like to introduce you to the following introduction, and maybe you can make a profit from it. How does the rotary vane vacuum pump work? Let's learn about it. When the rotary vane vacuum pump in the laboratory is lower than the full steam pressure under the pump temperature, it can be filled with gas and discharged from the pump at any time to avoid condensation in the pump oil. In addition, when the closed pump mouth is working.

The condensate of condensable gas that has been mixed into the oil may be dissolved in the oil in the gas phase, which will overflow from the pump cavity. At this time, if the mission of opening the gas town, a certain amount of condensable substances can be pumped out, and then play a certain pollution effect, extending the operation period of the pump oil.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

Oil change operation of vacuum pump unit

Whether it is a vacuum pump unit or any other mechanical equipment, it is inseparable from lubricating oil, because lubricating oil can effectively help the equipment to work better. However, this lubricant cannot maintain its function for a long time. It needs to change the oil according to the use of the device. Because after a long time of work, the oil quality of the unit will be polluted by various external factors, otherwise, if the lubricating oil is replaced in time, the unit will be damaged. 

1. When the vacuum pump is equipped with replacement oil, the pump should be taken out of the vacuum system first.

2. After that, the end of the chassis motor should be raised. Open the oil drain plug to drain the oil. Turn the device to keep the exhaust port, let all dirty oil in the chamber drain out from the oil drain port, and then add new oil from the air inlet. Oil 100-500ml continuous rotation 5-10 rpm or more for internal cleaning, this operation 3-5 times.

3. After taking out the oil, cover the oil plug, put the pump horizontally, add new oil from the air inlet and oil hole, and change the oil.

4. When the vacuum pump is equipped with oil displacement, it is not recommended to start the motor for a long time. At this time, the exhaust valve will be too severe and fatigue.

5. When changing the oil of vacuum pump unit, kerosene, gasoline, alcohol, etc. should not be used for non disassembly cleaning of the pump.

6. If the pump stops for a long time, the exhaust hood should be removed and the exhaust plug should be closed to the air inlet and drained。

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

Advantages of corrosion resistant water ring vacuum pump

Corrosion resistant vacuum pump, in particular, is a kind of water ring vacuum pump with corrosion-resistant materials set on the surface or local parts of parts flowing through the fluid. It is suitable for compression, filtration, concentration, adsorption, cooling, reaction and other process units in chemical, metallurgical, environmental protection, pharmaceutical, paper-making, chemical fertilizer and other industries. 

It has the characteristics of low cost, long life, relatively simple manufacturing process and high cost performance. The utility model integrates the advantages of several existing corrosion-resistant water ring vacuum pumps. According to the different requirements of corrosion resistance of various flow passage parts, according to the principle of equal life and actual process conditions, the utility model adopts different corrosion resistance measures on the substrate made of cast iron, cast steel or carbon steel, so as to greatly improve the acid resistance, alkali resistance and other corrosion resistance properties, especially the service life when pumping corrosive gases It can work reliably within the specified maintenance period under the vacuum degree of 3kpa absolute pressure and water and air brush. The maintenance cycle is 0.5-2 years according to the working conditions of corrosive medium, temperature and pump speed. Under the same working conditions and service life, the cost is at least 1-5 times lower than that of stainless steel.

It can be used repeatedly and economically. When the corrosion-resistant lining layer of the utility model is aged and invalid, it can be repaired simply, economically and effectively. Since the substrate of the parts will not fail, the maintenance can be repeated.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump

How to eliminate noise of vacuum pump

1. If the vacuum pump is in the working state, the vacuum degree indicated by the vacuum meter is about -0.093, it will produce sharp noise (cavitation sound). This is a normal phenomenon, because the vacuum pump itself has a matching cavitation protection pipe to reduce this noise, so as long as the valve is opened, the noise can be reduced. 

2. If the flow rate of working fluid is too large, cavitation noise will also be generated. If the flow rate of working fluid is not the above problem, it is very likely that the intermittent noise caused by friction and impact caused by impurities in the pump body may be caused by the high-speed operation of the impeller. Please repair and maintain it as soon as possible.

3. If the design, manufacture or material are not proper, the vane sliding is not smooth, or the blade head cannot always run close to the cylinder wall due to the existence of exhaust dead gap and incompressible oil, it will cause the impact sound of the vane on the cylinder wall. Therefore, the circular arc structure should be adopted to separate the inlet and exhaust ports. The dead gap is eliminated by the exhaust guide groove.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

How to select the required vacuum pump unit

The matching of vacuum pump unit is a strict series of specifications, which must be strictly calculated and designed. Therefore, when choosing the vacuum pump unit, we should consult the vacuum pump manufacturer or the vacuum pump professional. 

At the same time, when selecting the vacuum pump unit, we should inform the vacuum pump unit manufacturer of the practical application status and needs. Let them design supporting facilities according to the actual situation of consumption.

At the same time, we should pay attention to the overall quality of the vacuum pump unit, especially the quality of the vacuum pump. The quality of the vacuum pump often determines the quality level of the vacuum unit. At the same time, the manufacturer of vacuum pump unit will consider whether the auxiliary equipment such as condenser and dust collector can be required on the air inlet pipe of vacuum pump according to the practical application of users.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

Daily precautions for Roots blower of calcium carbonate

The special roots blower for calcium carbonate is widely used in various industries. The following is a brief introduction to the matters needing attention in the daily operation of the roots blower for calcium carbonate 

1. Open the vent valve before startup and shutdown of special roots blower for calcium carbonate to ensure the start and shutdown of Roots blower under no load condition. Pay attention to observe during the production process, the current should not exceed the rated current of the motor.

2. The roots blower is rinsed with water once every 12 hours. The water consumption of 40 m3 blower is 10 L and that of 60 m3 blower is increased appropriately. (flushing water, hot water is better) calcium carbonate roots blower

3. Adjust the V-belt tightness after 5-7 days operation of Roots blower. If the belt is too loose, the air volume will be insufficient, and the motor and fan are easy to be damaged).

4. The special roots blower for calcium carbonate should be replaced with new oil after running for one month, and then every three months. The oil injection amount is between the middle red dot and the upper edge of the oil indicator.   

5. The water-cooled roots blower must be equipped with circulating water, and the water temperature should not be higher than 25 degrees to ensure smooth water flow.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

Three leaf roots blower for sewage treatment

Roots blower is a necessary core equipment in sewage treatment process, which directly determines its effect and energy consumption. In the process of biological wastewater treatment, roots blower is mainly used to increase oxygen in the aeration tank, promote the growth of aerobic microorganisms, decompose suspended solids, dissolved organic matter, nitrogen and phosphorus and other nutrients in sewage through their metabolism, so as to achieve the purpose of sewage treatment, which is the core equipment of sewage treatment plant. The performance of the fans we use has the most direct impact on the quality and energy consumption of sewage we treat. 

Because roots blower belongs to constant flow fan, the main parameter of Roots blower working principle is air volume. The output pressure changes with the change of pipeline and load, and the change of air volume is very small.

Roots blower is a kind of high-pressure fan. Roots blower is a positive displacement fan. The delivered air volume is proportional to the number of revolutions, and the gas is transported from the suction side to the discharge side.


CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump 

Price of series three leaf roots blower

For the series Roots blower, the manufacturer should adjust the belt of the fan to the appropriate tight state before the roots blower leaves the factory, so as to ensure the smooth operation of the fan. The loose belt will not only cause heat, but also fall off and damage. Too tight belt will also lead to belt heating, and will affect the fan linkage, loss in the process of power transmission, and the belt may even break in the process of operation. Therefore, whether it is too loose or too tight is not good. Therefore, fan manufacturers should strictly test all aspects of fan indicators when leaving the factory. 

The belt heating of Roots blower is even more serious in summer. Some customers pour water on the belt in order to cool down the fan belt. In fact, this method is wrong. Although it will lower the temperature of the belt, it will seriously affect the fit of the belt and pulley, reduce friction, and lead to insufficient power transmission and slipping. If the water flows into the fan, it will cause the internal impeller of the fan to rust, and even damage the Roots fan if it goes on for a long time.

API Liquid Ring Vacuum Pump

Rotary Vane Vacuum Pump

Dry Scroll Vacuum Pump

Selection of lining materials for corrosion resistant vacuum pump

Corrosion resistant vacuum pump is a kind of self-priming pump with liquid corrosion resistance and long service life. Its material must be special. The first characteristic is corrosion resistance. Next, we introduce the selection of lining materials for corrosion-resistant pump 

It is necessary to satisfy the technical parameters of flow, head, pressure, temperature, NPSH and other technical parameters of corrosion-resistant vacuum pump products. It is necessary to satisfy the requirements of medium characteristics. F46, as the material of equipment fabric, absorbs a few touch substances in the process of application because there is a small space between F4 macromolecules, which is dispersed and relocated among them. The absorption image is usually shown by a small amount of weight gain and color change, and the amount of absorption increases with the increase of working pressure and touch time. In addition, it can be solved by lowering the temperature, shaking the scale and improving the planning.

In addition, the volume of pores between macromolecules increases with the increase of temperature, and liquid absorption and infiltration will also be added. Thus, the circulation effect at high temperature will cause the liquid absorbed by F4 to expand or transpiration, resulting in pores, and finally form damage. For example, after 34 months of operation, small spots appear on the surface of the pipeline of trichlorosilane rectification equipment, which will be carried out continuously in small shifts for one year. Therefore, this is the demand for F4 sheet as chemical anti-corrosion fabric. The lower the porosity content, the better. The specific gravity is necessary to be greater than 2.18, and the thickness is also required, usually 1.5 ~ 3 mm. The planned service life of the pump is usually at least 10 years. When determining the type and manufacturer of the pump, we should sum up and consider the pump's function, energy consumption, reliability, quotation and manufacturing standards.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

Regular maintenance of vacuum pump unit

With the rapid development of the national economy, enterprises and units put forward higher and higher requirements for the safe and reliable operation of vacuum pump units. In order to achieve this requirement, we must do a good job in the regular preventive maintenance of vacuum pump unit. 

1. According to the scheduled time interval to the site for machine repair.

2. Repair or replace the equipment before major failure occurs. If properly arranged, the maintenance cost of this scheme will be less than that of post accident maintenance.

3. When the vacuum pump unit does not need to work continuously, it is obvious that the technical personnel with rich maintenance experience can carry out regular preventive maintenance.

4. Otherwise, it will cause unnecessary maintenance. There will also be a series of problems, such as the complete machine being disassembled, repeated secondary installation leading to the decline of installation accuracy and so on.

Regular preventive maintenance of vacuum pump unit is the key to its work efficiency. It can make the vacuum pump unit in a stable working state for a long time, reduce energy consumption and prolong its service life.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

2BV water ring vacuum pump pressure

For 2BV water ring vacuum pump knowledge, I believe you have a certain understanding, to have a better use of it, you need to know about its pressure knowledge, the following is about its pressure knowledge. 

1. Limit absolute pressure: the absolute pressure is how much higher the measured internal pressure is than the "theoretical vacuum (theoretical vacuum pressure value is 0Pa)". It compares the absolute vacuum pressure of the theoretical state. Due to the limitation of technology, we can't pump the internal pressure to the absolute vacuum value of 0Pa in any case. Therefore, the vacuum value pumped by 2BV water ring vacuum pump is higher than the theoretical vacuum value. So when expressed in absolute vacuum, there is no negative sign in front of the value.

2. Limit relative pressure: the relative pressure is how much lower the measured internal pressure is than the "atmospheric pressure". It shows that the actual value of system pressure is lower than that of atmospheric pressure. Because the air inside the container is pumped, the pressure inside the 2BV water ring vacuum pump is always lower than the external pressure of the container. Therefore, when expressed in terms of relative pressure or gauge pressure, the value must be preceded by a negative sign, indicating that the internal pressure of the container is lower than the external pressure.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump 

Impeller machining of water ring vacuum pump

Impeller is an important part of water ring vacuum pump, which plays an important role. From blank processing to mechanical processing, every step of this component should meet the requirements of size, quality and material. Only in this way can we achieve stable operation. The processing of impeller should be standardized, and each step of processing should be accurate, and small links should not be ignored Only in this way can the quality of the whole vacuum pump be improved. 

The blank casting of impeller is directly related to the machining step. The reliable quality of the blank can ensure that there will be no defects such as fracture and deformation during machining. The components of water ring vacuum pump have accurate design requirements, and the size of impeller is strictly measured. Therefore, the requirements of design drawings should be strictly followed from casting to machined parts Each processing link should be accurate to avoid production waste.

Whether the impeller production of water ring vacuum pump conforms to the design standard is inspected and passed by the quality inspection department. If only the wheel fails to meet the standard, problems will occur during assembly, which will easily lead to the overall failure of the pump. Standardized and standard unified examination should be conducted for the impeller processing. No matter in which link, the operator should be responsible and play a good technical ability, Strengthen their sense of responsibility and do the work in place.

Vacuum System Of Tissue Paper Machine

Rotary Vane Vacuum Pump

Dry Scroll Vacuum Pump

Oil vacuum pump system

From the perspective of energy saving and emission reduction, it is a problem that every vacuum operator must face up to. The traditional concept of oil-free is only to obtain a clean, carbon free hydride pollution-free vacuum environment. Today's "oil-free" not only meets the requirements of clean vacuum environment, but also protects the environment to prevent the pollution and emission of waste oil and waste gas.

The traditional oil vacuum system (2x type rotary vane vacuum pump) generally has low energy utilization rate, especially the oil booster pump and oil diffusion pump. It is under this background that the molecular pump is widely used and has the potential to replace the traditional diffusion pump in the area less than 400 mm. The power of the diffusion pump is five times higher than that of the molecular pump with the same diameter of 250mm. In the long run, the market space of oil vacuum system is bound to be narrower and narrower.

Function Of Various Vacuum Pumps In Vacuum System

Rotary Vane Vacuum Pump

Dry Scroll Vacuum Pump