Effect of pressure on corrosion resistant vacuum pump

The use of corrosion-resistant vacuum pump is under the action of a certain pressure, for the pressure formed by different altitudes, the impact of vacuum pump is different. The use of corrosion-resistant water ring vacuum pump skillfully uses this principle. 

Corrosion resistant vacuum pump is used to pump the gas in the system, and then discharge to the surrounding atmosphere to form a vacuum, or pump the surrounding atmosphere to discharge into the system to form pressure. Obviously, the ambient atmospheric pressure has an important influence on the performance of corrosion-resistant water ring vacuum pump. The design of corrosion-resistant water ring vacuum pump is based on the assumption that the ambient pressure is a standard atmospheric pressure. All its performances refer to the performance under this condition. Due to the requirements of process flow, the inlet or outlet pressure of corrosion-resistant water ring vacuum pump is sometimes not equal to one atmospheric pressure even if it is operated at sea level around one standard atmospheric pressure. For example, the inlet of some corrosion-resistant water ring vacuum pump requires the vacuum of the system, while the outlet requires compressed gas, that is to say, it is required to be used as a vacuum pump and a compressor at the same time. It is also possible to master the changes of pump performance according to the law of the influence of atmospheric pressure on pump performance.

If we have mastered the law of the influence of different atmospheric pressure caused by altitude on pump performance, we can design corrosion-resistant water ring vacuum pump suitable for each altitude area according to this law, and we can also convert the operation of corrosion-resistant water ring vacuum pump under non-standard atmospheric pressure conditions (such as in different altitude areas) according to this law In this way, the corrosion-resistant water ring vacuum pump meeting the requirements can be correctly selected.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump 

Vacuum solenoid valve

The vacuum valve controlled by magnetic force is called vacuum solenoid valve. The sealing mechanism of electromagnetic vacuum valve is the same as that of baffle valve, as shown in Figure 1. Normally, the valve cover of the solenoid valve is compressed by the spring to seal the pipeline channel. When the solenoid valve is required to open, the current is connected to the solenoid coil, which generates magnetic force to absorb the armature, and drives the valve cover to open the valve. 

The solenoid valve can also be designed as a differential pressure type structure with inflation function, which is called vacuum differential pressure charging valve or electromagnetic differential pressure valve. It is installed at the air inlet of the oil sealed mechanical pump. The valve and the pump are connected to the same power supply. The start and stop of the pump directly control the opening and closing of the valve. When the pump is stopped due to work demand or sudden power failure.

The valve uses atmospheric pressure to make the valve core fall down automatically, cut off the channel connected with the vacuum system, and release air into the pump at the same time, so as to prevent the mechanical pump oil from flowing back and contaminating the vacuum system, which plays a role in maintaining the vacuum system and is conducive to the mechanical pump starting again.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

single acting reciprocating vacuum pump working principle

Vacuum pump is a kind of widely used vacuum equipment, which can be divided into reciprocating, reverse type and so on. This paper focuses on the principle of reciprocating vacuum pump. 

The working principle diagram of single acting reciprocating vacuum pump: its working process is: when the piston moves to the right, the space volume on the left side of the piston in the cylinder increases, and the gas pressure drops. When the pressure drops to a little less than the pressure in the suction inlet pipe, the gas from the suction inlet opens the inlet valve and enters the cylinder. With the piston moving to the right, the gas continues to enter the cylinder until the piston moves to the end of the right, which is the suction process. In the suction process, because the gas pressure outside the exhaust valve is greater than the pressure in the cylinder, the exhaust valve can not be opened. When the piston begins to move to the left, the intake valve is closed by the hair in the cylinder, so that the gas can not flow back to the suction line. When the piston moves to a certain position, the gas in the cylinder is compressed to a pressure slightly higher than the outlet pressure, the exhaust valve is pushed open, and the gas in the cylinder is discharged until the piston moves to the end of the left side, which is the exhaust process. In this way, the reciprocating motion of the piston can form a vacuum at the suction pipe.

Reciprocating vacuum pump also has a single-stage and multi-stage difference. The vacuum degree of single-stage double acting high-speed vacuum pump can reach 10-20 mmHg (certain pressure). The multi-stage vacuum pump can reach higher vacuum degree.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

Characteristics of large vacuum pump and micro vacuum pump

With the rapid development of China's economy, the demand for vacuum pump in industry and other fields is growing. In the face of fierce competition in the vacuum pump market, how should users choose their products? What is the difference between large vacuum pump and micro vacuum pump. 

The characteristics of large vacuum pump: high power, high limit vacuum, but high price, large volume, large weight, high noise, high energy consumption, need regular maintenance, not easy to move, etc. Some must use vacuum pump oil or lubricating oil, which will produce oil mist in work, but it will be wasted in low vacuum situation. For example, in the laboratory, only a small amount of gas needs to be sampled, analyzed, circulated, vacuum adsorbed, gas transferred, pressurized, indirectly absorbed water and drained by pump, many disadvantages of large vacuum pump have been exposed. So how to reduce these shortcomings is a very difficult job for professional staff, but it is still worth our expectation.

Micro vacuum pump features: small size, low noise, low power consumption, easy to operate, easy to carry, maintenance free, 24-hour continuous operation, also allows the medium rich in water vapor. The most important thing is that it is dry and oil-free and does not need vacuum pump oil or lubricating oil, so it will not pollute the working medium and interfere with the analysis of medium. And the price is much cheaper.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

Requirements of vacuum pump for smooth oil

In fact, the factors that affect the vacuum degree of vacuum pump are various, including sealing method, spare parts space, quality of materials, etc. This paper mainly explains the requirements of vacuum pump for smooth oil, because the quality of oil will also affect the vacuum degree of vacuum pump. 

(1) With appropriate viscosity: the viscosity of oil is too small, the smoothness is not satisfactory, the sealing performance is also poor, the viscosity is too high, the internal conflict is large, the rotor rolling is difficult, the kinetic energy consumption is increased, and the oil temperature is also increased. The increase of oil temperature will accelerate the oxidative degradation of oil, especially for rotary vane vacuum pump.

(2) Low full vapor pressure: the target of "vapor pressure" of oil is low, so it is not easy to transpiration under the working conditions of low pressure and high temperature in vacuum pump, so as to ensure the required vacuum degree.

(3) The oxidation stability is good, and it is not easy to oxidize and degenerate.

Generally, vacuum pump oil is selected for vacuum pump. At present, domestic vacuum pump oil only needs No.1, which is refined from natural crude oil. It has smooth and sealing effect in vacuum pump

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump

Requirements of vacuum pump for lubricating oil

In fact, the factors that affect the vacuum degree of vacuum pump are various, including sealing mode, clearance of accessories, material quality and so on. This paper mainly explains the requirements of vacuum pump for lubricating oil. 

(1) With appropriate viscosity: the viscosity of oil is too small, the lubricity can not meet the requirements, the sealing is not good, the viscosity is too high, the internal friction is large, the rotor rotation is difficult, the kinetic energy consumption is increased, and the oil temperature is also increased. The increase of oil temperature will accelerate the oxidation deterioration of oil, especially for rotary vane vacuum pump.

(2) Low saturated vapor pressure: the "vapor pressure" index of oil is low, so it is not easy to evaporate under the working conditions of low pressure and high temperature in the vacuum pump, so as to ensure the required vacuum degree.

(3) The oxidation stability is good, and the oil in use is not easy to oxidize and deteriorate.

Generally, vacuum pump oil is selected for vacuum pump. At present, there is only No. 1 vacuum pump oil made in China. It is made of natural crude oil and refined deeply. It plays the role of lubrication and sealing in vacuum pump.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump

Performance of oil free vacuum pump

The working principle of oil-free vacuum pump is the same as that of general positive displacement pump. It is composed of stator, rotor, rotating plate, cylinder block, motor and other main parts. The rotor with rotating blades is eccentrically installed in the stator cylinder. When the rotor rotates at high speed, the four radial sliding blades in the rotor slot divide the pump chamber into four working rooms. Due to the centrifugal force, the rotating blades are close to the cylinder wall, separating the stator inlet and outlet. The operation is repeated to change the volume and discharge the inhaled gas from the exhaust port, so as to achieve the purpose of air extraction. 

At present, there are few domestic oil-free vacuum pump manufacturers. Basically, they can only produce rotary vane vacuum pump products that must be filled with vacuum oil. Basically, the market is imported oil-free vacuum pump products. It has the advantages of simple structure, easy operation, convenient maintenance and no pollution to the environment. The two series of oil-free vacuum pumps have good durability. They are vacuum pumping, compression and dual-purpose vacuum pumps. They are basic equipment with a wide range of applications to obtain vacuum.

The oil-free vacuum pump has the advantages of convenient maintenance, easy operation, simple structure and no environmental pollution. The oil-free vacuum pump has good durability. It is a vacuum pump, compression and dual-purpose vacuum pump. It is a basic equipment with a wide range of applications to obtain vacuum. Compared with oil pump, oil-free vacuum pump has low vacuum degree and small pumping capacity, but it is small in size, easy to install, easy to maintain, convenient to move, no oil fume and no pollution to the environment, especially in the laboratory with high requirements. It is also one of the most common equipment in the laboratory. Therefore, when purchasing the oil-free vacuum pump, the vacuum degree required to work must be determined first. If the vacuum degree required is high, the vacuum pump selected shall be higher than the vacuum degree required, otherwise, the vacuum pump cannot meet the requirements of vacuum pumping, and the working requirements will not be met. Secondly, the pumping rate of oil-free vacuum pump should be slightly greater than the required pumping rate, so as to better meet the needs. Finally, see whether the extracted gas is corrosive. Corrosive gas will corrode the pump. Special materials must be used to meet the demand

Chemical Pressure Roots Blower

Roots Blower Impeller Wear Reason

SRR 150 Roots Blower Accessories 

Several Points for Attention in Maintenance of Vacuum Pumping Station

1. Because of the high requirement of pump accuracy, it is necessary to test carefully before repairing. It is not necessary to disassemble the pump before repairing, so as to avoid improper repairing and reduce the accuracy. Of course, it is necessary to adjust some parts when their performances become worse or their mating clearance varies.

2. Pump maintenance needs to be done step by step, not hard dismantling or forced dismantling. The disassembled pump parts are required to be sorted and labeled, which can be used when assembling. For example, the maintenance of Lyboa vacuum pump can be carried out according to the sequence of dismantling the motor, coupling, end cover and taking out the spindle first. But no matter what kind of pump is assembled, the parts must be dry and clean.

3. General assembly. After the parts and vacuum chambers are installed separately, try to rotate them to ensure that there is no blocking and tripping phenomenon. After the front cover is installed, the tension bolt can be penetrated from top to bottom, and the seat can be leveled after tension. Adjust the intake pipe of each vacuum chamber to make it on the same plane, then tighten the tension bolt, and try to turn the connecting rod. Its torque should be less than 100 kg?? cm, and there is no serious sense of local blockage. After installing exhaust valve, one-way valve, etc. At this time, the sprocket can be rotated. In this way, the seats have been assembled. Assemble the box part in reverse order when the pump is dismantled. Care should be taken to ensure that no leakage is allowed in the sealing area and oil leakage is not allowed in the oil sealing chamber.

Before the pump test run, put the oil in the vacuum pump station to the central position of the oil-viewing mirror, and then test the pump to observe the effect of the pump.

Turbo-molecular-pump

Large-Flow-Oxygen-Nitrogen-Vacuum-Piston-Pump

Water-Liquid-Ring-Vacuum-Pump-for-Toilet-Paper-Machine

Vacuum Pump Pumping Principle

Since the development of vacuum technology to such a wide pressure range, people have not developed a pump that can pump a container from the atmosphere to a high vacuum or ultra-high vacuum range.

Although all vacuum pumps are designed to reduce the number of gaseous molecules, the various types of pumps used to obtain low pressure involve several different principles. Vacuum pumping is based on one or more of the following principles.

Gas compression and expansion, used in piston pump, liquid column pump or water ring vacuum pump, rotary vane vacuum pump, Roots vacuum pump.

The drag force produced by the viscous effect is applied to the sub-steam jet pump.

The drag force produced by the diffusion effect is applied to the vapor diffusion pump.

Molecular drag force is used in molecular pumps.

Ionization effect is used in ion pump.

Physical or chemical suction is used in adsorption pumps, cryopumps and suction processes.

best-sales-double-stage-direct-drive-rotary-van-vacuum-pump

Best-High-Quality-liquid-ring-vacuum-pump-Price

Piston-Vacuum-Pump-in-Gas-Recovery

vacuum pump in coating application

Vacuum pumps are used in a wide range of applications in the coating industry and coating equipment.

      Vacuum coating technology is an important branch of vacuum application technology. It has been widely used in the fields of optics, electronics, energy development, physical and chemical equipment, construction machinery, packaging, civil products, surface science and scientific research. The methods used for vacuum coating mainly include evaporation plating, sputtering plating, ion plating, beam deposition plating, and molecular beam epitaxy. There is also a chemical vapor deposition method. If the purpose of vacuum coating is to change the physical and chemical properties of the surface of the material, this technology is an important part of the vacuum surface treatment technology.

    First of all, optically, after plating a film of one or more layers of different materials on an optical glass or quartz surface, it can be highly reflective or non-reflective (ie, antireflection) or any desired proportion of reflective or transmissive material. A color filter that absorbs at one wavelength and transmits to another wavelength. High-reflection films are needed from large-diameter astronomical telescopes and various lasers, to large windows coated with jasmine in new buildings. Antireflection coatings are widely used in photography and various lasers, and large window coated glass in new buildings. Antireflection coatings are used extensively on lenses for cameras and television cameras. In vacuum, vacuum coating is extremely important. Inheritance circuits of various sizes. Conductive films, insulating films, and protective films are used to include memory, arithmetic, and logic components. As a mask for preparing the circuit, a chromium film is used. Tapes, disks, semiconductor lasers, Josephson devices, and charge-coupled devices (CCDs) are also known for various films.two-stage-liquid-ring-vacuum-pump

In terms of display devices, a recording head, a high-density video tape, and a transparent conductive film of a flat display device, a photoconductive film of a camera tube, and an aluminum lining of a fluorescent screen of a display tube are also prepared by a vacuum coating method. In terms of components, nickel chrome is evaporated in a vacuum, chromium or cermet can be used to make electrical resistance, and aluminum, silicon monoxide, titanium dioxide, etc. can be evaporated on the plastic to manufacture capacitors, and evaporating selenium can be used to obtain a toner cartridge for electrostatic copying machines and evaporating barium titanate. Manufacturing magnetostrictive sounding elements and the like. Vacuum evaporation can also be used to make superconducting films and microbead coatings for inertial confinement macroreactions. In addition, it is also possible to manufacture a super-hard film for a vapor deposition decorative film such as a jewellery, a watch case surface, a textile metal pattern, a gold silk wire, and the like, and a tool, a mold, or the like by sputtering or ion plating. In the past two years, multi-arc ion plating has been used to prepare titanium alloy products, such as stainless steel sheets, mirror panels, columns, handrails, high-grade bed brackets, and stair railings, which are currently prevailing.vacuum-pump-used-in-sugar-plants

Roots vacuum pump operation

Roots vacuum pump operation and maintenance problems

1.Start the Roots vacuum pump and prohibit the outlet overpressure during the operation of the pump. If the outlet is over-pressurized when the pump is started, the light motor will trip and the pump will not start. The heavy one may damage the equipment; during the operation, the outlet is over-pressurized, the load of the pump increases, and the motor trips in severe cases.

2.Start or switch the Roots pump when the vacuum is at a minimum. That is, when the two towers are switched and evacuated, the Roots pump is started or switched. At this time, the pump inlet pressure is the highest, the pump outlet pressure is close to the pump, and the starting load is minimum. In an emergency, the pump should be prevented from starting and switching at a high vacuum.

3.When starting, close the inlet valve and open the inlet valve quickly after starting. According to the design requirements of the Roots vacuum pump, the pump inlet and outlet valves need to be fully opened before the pump is opened. However, in actual operation, it is difficult to ensure the tightness of the outlet check valve. If the inlet and outlet valves are fully opened, the pump will be reversed. At this time, the pump is started. It can't start because of the large starting load. According to the actual situation, the pump outlet valve is fully opened, and the inlet valve is slightly opened to ensure that the pump does not reverse. After starting the motor, the inlet valve is quickly opened.Rotary Vane Vacuum Pump

4.According to the Roots vacuum pump body temperature and outlet temperature to determine the operating state of the pump. Because the noise of the Roots pump is large, the sound of the pump is light and heavy as the load changes. It is difficult to judge the operation of the equipment from the sound during the inspection. Judging the running condition of the equipment mainly depends on the temperature of the pump body and the change of the temperature of the first and second outlets. The temperature of the pump body is more important because the outlet temperature reflects the temperature slower than the pump body. Once the pump outlet temperature rises, the pump body temperature rises faster. It may be too late to process the pump.Molecular Vacuum Pump Price

dry screw vacuum pump introduction

Dry screw vacuum pump is now a more popular product, and it is also a very high-tech products, today to introduce to you about the basic situation and principle of dry screw vacuum pump.

Dry screw vacuum pump is used to obtain vacuum environment equipment. Dry screw vacuum pump can obtain a high vacuum environment. At the same time, it can also work normally in some harsh environment. It can vacuum the air containing particulate matter and be used in electronics industry, chemical industry and biomedical field. Extensive.

What is the working principle of the dry screw vacuum pump? In fact, the dry screw vacuum pump is the use of a pair of screw equipment in the pump for high-speed synchronous reverse rotation movement, through this movement to exhaust and suction, the rotation of the two screw have been precisely calculated, corrected, through the support of bearings, to ensure that there will be no friction between the components during work. It can run smoothly, at the same time, it also achieves low noise and no need of lubricating oil.dry-screw-pump-and-claw-pump-of-principle

Based on the principle of dry screw vacuum, it has the following advantages: low noise, no need to use lubricant, low power consumption, almost no maintenance, high vacuum limit, can work in the environment containing a large amount of steam and a small amount of dust.rotary-vane-vacuum-pump-maintenance

Application Advantages Of Vacuum Pump In Sugar Industry

A long time ago, sugar mills used piston vacuum pumps because piston vacuum pumps consumed a lot of fuel, vibrated a lot and were easy to break down. Later, the pump produced negative pressure with water jet pump to replace the piston vacuum pump. It has low efficiency, high power consumption, high water consumption and pollution to the environment. It needs to pay a large amount of pollution control cost.application-advantages-of-vacuum-pump-in-sugar-industry

Through the investigation of the characteristics of each link in the sugar industry, a new generation of boiling sugar and evaporation vacuum system, which is suitable for the sugar industry, is designed and produced according to the characteristics that the vacuum filtration requirement of the sugar factory is large and crystallized and the vacuum degree of the sugar is required. The system mainly includes water ring vacuum pump and condenser.the-maintenance-steps-of-the-vacuum-unit

The vacuum pump mainly applies four aspects of sugar industry: sugar boiling, evaporation, suction filter and vacuum water diversion. Compared with the hydraulic jet condenser, the vacuum pump can greatly reduce the water and sewage charges and save costs. The water consumption is only 1/5 of the water jet condenser, which greatly saves the water consumption of the river, especially for the sugar factory which is lack of water resources or the higher requirements for environmental protection.cleaning-of-water-ring-vacuum-pump

TYPE OF OIL DIFFUSION PUMP

The diffusion pump is called diffusion-type steam flow pump, and it is one of the steam flow pumps. Although there are many kinds of pump fluid, most of them are low saturated vapor pressure oil. As working liquid said by an oil diffusion pump oil diffusion pump, with mercury diffusion pump fluid called mercury diffusion pumps, oil diffusion pump is most commonly used, diffusion pump ensures the former level in 10-2 ~ 10-3 of vacuum conditions to be able to do the work well. Vacuum-pump-in-vacuum-distillation

A mechanical pump is usually used as a fore - stage pump. Ordinary diffusion pump can get 10-4 ~ 10 9 ultimate pressure, if the baffle or liquid nitrogen frozen cold trap, and to bake to gas containers, can get 10-8 to 10-11 of the ultra high vacuum, if the pump is well designed, coupled with the removal of oil steam reflux and strict measures such as permanent gas pollution sources, and then took in more than 10-14 supporting high vacuum can be reached.Type-of-oil-diffusion-pump

Diffusion pump's main advantage is: extraction capacity big, wide speed range, for various gases including inert gas (e.g., neon, helium, etc.) have the same pumping speed, this is unmatched by any other kind of pump; Moreover compared with other high vacuum or ultra high vacuum to obtain equipment, lower unit cost needed for pumping speed (no need to be very expensive, such as cryogenic pump condensing agent), simple structure, no mechanical rotation, easy to operate and can be recycled repeatedly, easy to maintain, long service life and is very easy to obtain high vacuum.
The-application-of-water-ring-vacuum-pump-in-coal-mine-industry