11/14/2018

Roots vacuum pump



Product characteristics:
Clean vacuum; there is no lubricant in the chamber, and it has stable exhaust performance for vapor, solvent and other gases; it can operate under high suction pressure.
Roots vacuum pump (referred to as roots pump) is a rotary variable volume vacuum pump. It evolved from roots blower. According to the different working range of Roots vacuum pump, it can be divided into low vacuum Roots pump with direct air discharge, medium vacuum Roots pump (also known as mechanical booster pump) and high vacuum multi-stage Roots pump. Generally speaking, roots pump has the following characteristics:
There is a larger pumping speed in a wider pressure range.
Quick start and immediate work.
It is not sensitive to the dust and steam contained in the gas.
The rotor need not be lubricated, and there is no oil in the pump cavity.
Vibration is small, rotor dynamic balance condition is better, no exhaust valve;
The driving power is small, and the mechanical friction loss is small.
Compact structure and small footprint.
Operation and maintenance costs are low.
Therefore, Roots pump is widely used in metallurgical, petrochemical, paper, food and electronic industries.
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11/08/2018

molecular pump energy saving lamp application


This paper mainly introduces the application of molecular pump in the manufacture of energy-saving lamp round car instead of Roots pump. The experiment shows that the effect of energy reduction and efficiency increase is remarkable, and it has great significance for popularization. With this, the application of molecular pump in lighting industry can be promoted, production efficiency can be improved, energy consumption and manufacturing cost can be reduced, and product quality can be guaranteed.
Nowadays, the rapid development of economy brings about huge consumption of energy and threatens the living environment of human beings. It is an urgent worldwide task to improve efficiency, reduce consumption, save energy and reduce emissions to protect the environment. In the application of wide molecular pump, diffusion pump or Roots pump are replaced in many occasions, and good energy-saving and consumption-reducing effects are achieved.
As we all know, the promotion and use of energy-saving lamps in the lighting industry is a measure to save energy and reduce consumption. If all the current ordinary incandescent lamps are replaced by energy-saving lamps, more than 60 billion kilowatt-hours of electricity can be saved throughout the year, which is equivalent to the annual power generation of a Three Gorges hydropower station. However, energy-saving lamps have been introduced to the market for a long time, but their popularity has failed to achieve the desired results. The reason is simple: the energy consumption cost in the manufacturing process of energy-saving lamps is higher, so their relative sales price is also expensive.
According to the relevant information, the high price of energy-saving lamps leads to the difficulty of household consumption, which affects the market promotion. For enterprises manufacturing energy-saving lamps, their previous research and development investment is too large, as well as the production cost is too high. Even if energy-saving lamps save 60% energy than traditional bulbs, their life is 8 times longer than the latter, but their price is 4-5 times the price of ordinary bulbs. In this way, although the energy-saving lamp can save energy and money, but in a certain period of time, considering the immediate interests, the one-time investment is indeed a little larger, moreover, there are doubts in product quality assurance and service life.
Promoting the use of energy-saving lamps is a long-term and arduous energy strategy for the country. Compared with the promotion of energy-saving lamps such as discount, the government should play an active role in this regard, which is not only the top priority, but also can do something. At the same time, the state should formulate corresponding policies and supporting laws and regulations, set up special financial subsidies for energy-saving products, tax relief and other preferential measures, encourage more enterprises to invest in the production and development of energy-saving products, innovate processes, help enterprises reduce production costs, so that energy-saving products have more price advantages in the market competition. In addition, the whole society should support the development of energy-saving and environmental protection research activities in order to achieve energy-saving and environmental protection in the whole society.
At present, in the enterprises that manufacture energy-saving lamps, most of them adopt automatic line of circular row machine, which has high production efficiency and good product quality consistency. However, in general, round row machines are equipped with direct-connected vacuum pumps and Roots vacuum pumps as units, which brings new problems: 1) high power consumption; 2) high noise; 3) large occupied area. For this reason, all lighting equipment enterprises and lighting production enterprises are actively looking for new technology and new methods to carry out technological transformation in order to improve these conditions. Replace the roots pump unit with molecular pump unit.
At present, in the promotion and application of energy-saving lamps, the government gives strong support and corresponding subsidies and policy support. Relevant enterprises are also actively looking for ways and means to save energy and reduce consumption. In the production process of energy-saving lamp, we should tap the potential of reducing consumption and adopt new technology and new means to realize energy-saving in production. This is a successful attempt to save energy and reduce emissions in the production of energy-saving lamps in the lighting industry.

1. Molecular pump experiments introduction

The composite molecular pump adopts the integral rotor processing technology, which greatly improves the overall strength of the rotor, and greatly reduces the gas reflux between different levels of the movable sheet, so as to obtain better vacuum performance faster. The ingenious cavity design in the center of the rotor greatly reduces the probability of damage caused by foreign body falling into the pump. The molecular pump can work in the harsh environment such as large air flow impact or foreign body (broken glass) falling into. At the same time, it has the advantages of low noise, low energy consumption, small occupation, low maintenance cost, high vacuum, high pumping speed, no oil pollution and so on. Preliminary tests show satisfactory results and prove that the design meets the requirements. Finally, the compound molecular pump is used for the replacement test of the energy-saving lamp circulated machine to get the recognition of lighting.

2, Molecular pump comparative analysis

(1) the pumping rate of the molecular pump unit is higher than that of the roots roots pump unit, and the vacuum degree is one order of magnitude higher.
(2) less noise and less floor space.
(3) operation cost: 280 days a year, 24 h per day and 6720 h a year. Unit: The unit power consumption of Yuan Molecular Pump Unit is 2.38 kW *6720 H = annual power consumption of 15993.60 degrees *1 yuan/degree = 15993.60 yuan Roots Pump Unit power consumption of 8.8 kW *6720 H = annual power consumption of 59136 degrees *1 yuan/degree = 59136 yuan.
Through the above calculation, the investment cost can be recovered from the electricity charge in recent years (59136-15993.60 = 43142.40 yuan). The use of molecular pump units in second years saved 43142.40 yuan in profitability. If the cost of maintenance is considered more substantial, the molecular pump is almost maintenance free. The successful substitution of the molecular pump contributes tremendously to energy saving and emission reduction, achieves a win-win situation in manufacturing applications and expands the new application fields of the molecular pump, which is worthy of promotion.
The energy-saving lamp manufactured by the circular platoon car replaced by molecular pump is tested. The lamp life and quality are improved obviously. The oil pollution of the system is reduced by mass spectrometry analysis. Spectrum analysis shows that the lamp performance manufactured by molecular pump exhaust is greatly improved.
At the same time, according to the practical application feedback of many other special lamps (metal halide lamp, beacon lamp, etc.), car lamp, semiconductor lighting and other customers, molecular pump has played an obvious role in reducing production energy consumption, improving product performance and service life, and has been applied in some well-known lighting manufacturers at home and abroad. Molecular pumps have been well received and heavily replaced.
3. Conclusion
(1) Molecular pump units are directly used in circular row machines to adapt to the unavoidable high pressure caused by air leakage and breakage, the impact of atmospheric flow and glass debris in the manufacturing process, to achieve the goal of reducing consumption, saving energy and guaranteeing quality, so it can completely replace Roots pump units.
(2) Lighting industry has unlimited prospects, product manufacturing technology and product types are developing rapidly, and there is much room for innovation at the level of equipment manufacturing. Together, it contributes to improving the production efficiency of the industry, reducing energy consumption and manufacturing costs, and ensuring and improving product quality.
mailbox:contact@evpvacuum.com
Website source:www.evpvacuum.com
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11/06/2018

Main factors affecting the power of slide valve vacuum pump


The key to affect the power of the sliding valve pump is the exhaust pressure of the pump, and the size of the exhaust pressure of the sliding valve pump depends on the design of the exhaust system.
The first is the structural design of the exhaust valve. The exhaust system of single stage slide valve pump can be made of composite structure of floating valve and spring valve. When the inlet pressure of the slide valve pump is very high, because of the large flow of gas, it can discharge large flow of gas through the combined action of floating valve and spring valve; when the inlet pressure is low, only a small amount of gas can be discharged through the action of floating valve. For a two-stage spool pump, when working near the limit pressure, the exhaust system of the two-stage spool pump can not adopt the structure of the floating valve because the flow rate of the gas extracted by the pump is too small to operate accurately by the floating valve.
The second is the reset device of the exhaust valve. Floating valve is operated by differential pressure without reset device. The spring valve is reset by spring force. On the premise that the exhaust valve can close in time at the end of exhaust, the spring elasticity coefficient of the exhaust valve should be smaller. Under the same exhaust pressure, the exhaust valve has a larger stroke, and the exhaust valve has better conductivity, which is conducive to reducing the exhaust pressure of the pump and reducing the slide valve. Pump power.
The third is the design of exhaust passage. From the point of view of reducing the power of the slide valve pump, when designing the exhaust passage, it is necessary to ensure that the compressed part of the pump is always connected with the exhaust passage during the exhaust process, so as to avoid ineffective compression and lubricant compression, which is conducive to reducing the power of the pump; secondly, the exhaust passage must have sufficient conductivity to ensure the rapid discharge of gas. It is helpful to reduce the exhaust pressure of the pump.
The viscosity of lubricating oil has great influence on pump power. The viscosity of the lubricating oil makes the moving parts of the pump suffer additional resistance in the course of operation. The higher the viscosity of the oil, the greater the resistance and the greater the power consumption. With the increase of temperature, the viscosity of lubricating oil decreases, the resistance caused by lubricating oil decreases, and the power consumption decreases. For example, when the inlet pressure of the H-150 slide valve pump is 3.3 *104 Pa, the power is 12.2 kW and 11.2 kW when the temperature of the pump is 50 centigrade and the temperature of the pump is 75 centigrade. The effect of lubricant viscosity on starting power of sliding valve pump is more obvious. For example, starting power of 412H sliding valve pump (normal operation with 7.5 kW motor) is 32 kW at 8 C and 34.5 kW at 4 C. This phenomenon can lead to difficulty in starting sliding valve pump in winter.
Mailbox:contact@evpvacuum.com
Website source:www.evpvacuum.com
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11/05/2018

Rotary vane vacuum pump


I. summary of 2X rotary vane vacuum pump.
Type 2X rotary vane vacuum pump is a two-stage structure. Its working performance consists of two parts: high-pressure stage and low-pressure stage. Its suction port is connected with vacuum vessel or vacuum equipment. During operation, the gas in the vessel will be sucked and discharged in large quantities. When the equipment obtains vacuum, the high-pressure exhaust valve sheet will be closed, and the gas inhaled by the high-pressure stage will be transferred to the second stage, and then inhaled and discharged by the second stage, so that the vacuum equipment can obtain a certain vacuum. The technical parameter of the pump is 6 * 10-2Pa. According to the user's usage, it can be equipped with vacuum booster pump (such as Roots vacuum pump). The 2X rotary vane vacuum pump can be used as the front pump. Because the booster pump's pumping force is strengthened, the front pump can be continuously pumped out, which can make your equipment obtain higher vacuum.
Two. Application and application scope of 2X rotary vane vacuum pump.
With the rapid development of modern science and technology, the application of 2X rotary vane vacuum pump has been widely applied in various fields of science and various enterprises and institutions.
1. It can be used for scientific research, production and teaching in metallurgical, chemical, light industry, petroleum, medical, pharmaceutical, printing and dyeing, electrical appliances, vacuum, semiconductor, food, atomic energy, textile and other scientific research institutions, colleges and universities, industrial and mining enterprises.
2. Because 2X type rotary vane vacuum pump is made of ferrous metal and is relatively precise, the whole work of the pump is connected with oil, so it is not suitable for pumping out all kinds of gases which contain too much oxygen, toxic, explosive erosion of ferrous metal and have chemical effect on vacuum oil, nor can it be used as a compressor. And delivery pump for use. If a pump is equipped with a pneumatic device, a certain amount of condensable steam can be removed.
3 and 2X rotary vane vacuum pumps can be used to obtain vacuum directly below 10-3 torres, and to obtain vacuum above 10-3 Torres with other vacuum equipment.
4 and 2X rotary vane vacuum pumps are generally used at room temperature of less than 5 C and relative temperature of less than 90%.
According to the user's usage, it can be equipped with vacuum booster pump, which can be used as the front pump to form Roots rotary vane vacuum unit. Because the booster pump's pumping force is strengthened, the front pump is continuously pumped out, which can make your equipment obtain higher vacuum.
Mailbox: contact@evpvacuum.com
Website source: www.evpvacuum.com
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7/09/2018

VACUUM PUMP IN VACUUM DISTILLATION


The final step in the refining process of liquid products is usually rectification. The main purpose is to maintain the physical and chemical properties of the product. The refining yield of the product is as high as possible. Take the product as the normal distillation, remove the low boiling part as the solvent and the high boiling part as the bottom material, so as to achieve the product quality index. Liquid products are usually thermally sensitive to thermal deterioration, so it is especially important to refine at low temperature.

Similarly, for economic and environmental reasons, the solvent must be recycled. Refining of liquid products requires as high a vacuum as possible, usually operating under 10Pa (one standard atmosphere is 101325Pa). The configuration that satisfies this condition is: slide valve vacuum pump, claw pump two kinds of single pump, roots vacuum unit.
Roots and Screw Pump System(EVP).jpg
(1) roots vacuum unit

roots vacuum unit operating power is quite high. For the first stage pump to achieve equivalent of claw type pump swept volume of the same unit, the unit with power for 20 Kw, for day and night continuous operation of the vacuum generating device, the difference of 12.5 Kw, of charge of electricity of a year, 90000 yuan means that the gap (work day and night 300 meter per year. The electricity charge is one yuan per degree.

(2) Piston Vacuum Pump

It must have a vacuum pump in order to work effectively. When the gas flows through the vacuum pump, it is hard to avoid the vacuum pump oil out. This means you can't apply the recycled solvent directly, or waste it and pollute the environment. In addition, the operation and maintenance requirements of the slide valve pump are high, in cold season, a little careless switch machine, very easy to damage.
H Piston Vacuum Pump.jpg
(3) claw type pump

Using claw pump, there is no problem to recover the solvent at normal pressure after pump. In addition, due to its good structure, sophisticated processing and complete ancillary equipment, once put into use, it has low requirements for use, wide range of use, long service life and convenient cleaning and maintenance. When higher vacuum is required, it can be used as the front pump to form the vacuum unit conveniently.

7/06/2018

THE APPLICATION OF VACUUM PUMP IN INDUSTRIAL SECTOR


Vacuum pumps are widely used in industrial sectors, such as the manufacture of light bulbs, electronic tubes, food packaging, and semiconductor devices. Vacuum distillation, vacuum impregnation, ion nitriding, vacuum drying, vacuum carburizing, vacuum quenching, vacuum casting, etc. The harmful effects of gas can be avoided under vacuum condition because the number of gas molecules is small.

For example, heat treatment in vacuum can avoid oxidation and gas infiltration into the metallographic structure, so as to improve the quality of parts. Keeping high vacuum in electronic device can avoid the influence of electron motion. Keeping a high vacuum in vacuum packaging can improve the shelf life of food. In the modern advanced science and technology, vacuum technology is an indispensable means, such as high energy accelerator, controlled thermonuclear reaction, space simulation and other engineering needs high vacuum or ultra-high vacuum technology.
Turbo Molecular Vacuum Pump.JPG

Type of vacuum pump:

Gas transfer pump is a kind of vacuum pump that can make the gas inhalation and discharge continuously to achieve the purpose of air extraction. It includes variable capacity and momentum transfer.

1. Variable-volume vacuum pump is a device that USES the periodic change of pump chamber volume to complete the inhalation, compression and exhaust.

2. Momentum transfer vacuum pump is a kind of vacuum pump that USES high-speed rotating blade or high-speed jet flow to transmit momentum to the gas being pumped, so that it can inhale, compress and exhaust.

3. Gas trap pump is a vacuum pump that absorbs or condenses gas on the inner surface of the pump.

Many different kinds of vacuum pump, a mechanical vacuum pump (e.g., reciprocating vacuum pump, oil seal type vacuum pump, roots vacuum pump, turbomolecular pump, water ring vacuum pump, etc.), the jet vacuum pump (water steam injection pump, water injection pump, air injection pump, oil pump, oil diffusion pump, etc.), and physical and chemical adsorption pump (such as titanium pump, molecular sieve adsorption pump, cryogenic pump, etc.). Mainly used in mechanical industry department mechanical vacuum pump, other types of pump is used less.

7/05/2018

LIQUID RING VACUUM PUMP IN THE VACUUM DISTILLATION INDUSTRY


Liquid  ring vacuum pump in the industrial production process vacuum distillation is used more, how to choose correctly and use liquid  ring vacuum pump is particularly important. The vacuum distillation is one of the distillation methods. Under reduced pressure, commonly used in separation under atmospheric pressure is easy to decompose when heated to boiling point substances, or combined with other distillation methods such as steam distillation in order to reduce the distillation temperature and improve the separation efficiency. Used for separation and purification of chemical, organic, metal compounds, metal alcohol salts, etc.

Vacuum distillation is also used for deep purification of some special gases. Some compounds have high boiling points. To boil such compounds, it is better to lower the pressure of boiling rather than raise the temperature. Once the pressure is reduced to the vapor pressure of the compound (at a certain temperature), the compound begins to boil and the distillation can proceed. The technology is called vacuum distillation and is commonly used in the laboratory as a vacuum carburetor. This technique is useful for compounds that boil at atmospheric pressure above their decomposition temperature, and any attempt to boil them at atmospheric pressure will break them down.

Want better to use a product will need to have a comprehensive understanding to it, liquid  ring vacuum pump is the same, in order to facilitate everyone to use and improve your product operation proficiency, the next is to introduce the knowledge of vacuum distillation pressure.
2BE-series-bare-pump.jpg

1. The common vacuum distillation process of liquid  ring vacuum pump is mostly operated within the pressure range of more than 104Pa. The mechanism of vacuum distillation is similar to that of normal pressure distillation.

2. low liquid  ring vacuum pump vacuum distillation pressure range is 2.7 * 102 Pa, Pa 1.0 gas nearly transition flow state at this time, for the vacuum distillation device type selection, design, manufacture, installation, operation and so on all have more strict requirements.

3. The pressure range of crude vacuum distillation is 1.0*104Pa-2.7x102Pa, and the gas flow is viscous. Distillation within this pressure range is easy to achieve.

4. The pressure range of quasi-molecular distillation in liquid  ring vacuum pump is 1.0-1.0* 10-2pa. At this point, the average free path of gas molecules is similar to that of the distiller, and the gas is in transition flow.

5. The operating pressure of molecular distillation is below 1.33* 10-2pa. In liquid  ring vacuum pump molecular distillation or quasi molecular distillation device, the flow of the gas for the free movement of molecules, that is to say, you can ignore the other molecular collision and interference of the system, at this point, the distillation process governed by evaporation from the liquid surface.

In using the vacuum pump, please pay attention to:

1. What is the required vacuum degree and extraction speed in the vacuum distillation process?

2. Whether the gas pumped is corrosive.

3. Whether the gas pumped has inflammable, explosive and other risks.

4. Pipe connection of the gas pumped.

5. Whether the gas pumped contains condensable gases such as water vapor.