Vacuum pump in vacuum metallurgy

Each work of vacuum metallurgy needs to meet a certain degree of vacuum, and the requirements for different degrees of vacuum are also different.liquid_ring_vacuum_pump

Nowadays, a variety of pumps have been produced, which are constructed according to different pumping principles. They have different characteristics and reach different starting and stopping pressures, which is suitable for a certain range of pressures.rotary-vane-vacuum-pump-vacuum-thermoforming

Since the various pumps reach different pressures, the two or more pumps can be matched to meet the needs when the working pressure is low.

The gas generated in vacuum metallurgy may contain different substances, such as dust, fine metal particles, water vapor, volatile organic compounds, harmful gases, etc., and appropriate measures should be added to the pump or piping system to ensure smooth pumping and pump operation. Good, long life and no impact on the environment.rotary-vane-vacuum-pumps

Roots vacuum pump in paper mill

In small and medium-sized paper mills, most of them use low-speed small paper machines. For example, 1092 single cylinder (double cylinder) round wire machine, 1575 round mesh double cylinder paper machine, 1575 short net double cylinder paper machine, 1575 long net multi-cylinder paper machine, 1760 long net multi-cylinder paper machine. Most of the vacuum pumps that these paper machines used in the past were water ring pumps. With the advancement of technology, energy conservation and environmental protection, in the past ten years, the Roots vacuum pump and the Roots pump have been widely used in the vacuum system of paper machines at home and abroad. Satisfactory results can be obtained by matching the specifications of the machine with the relevant technical requirements of the paper type.rotary_vane_vacuum_pump

The choice of Roots vacuum pumps in the vacuum system of paper machines is based on several reasons:

(1) The effect of vacuum on the pumping speed and paper dryness of different quantitative papers The vacuum degree requirements of different quantitative paper sheets under different dryness. For example, when the basis weight is 24 g/m2, in order to obtain a dryness of 13%, the degree of vacuum must be 160 mmHg, and similarly, when the basis weight is 30 g/m2 and 65 g/m2, a dryness of 15% and 20%, respectively, is obtained. The degrees must be 200 mmHg and 450 mmHg, respectively. As this increases the thickness of the sheet due to the quantitative increase, it is necessary to increase the dryness in order to increase the wet strength of the wet sheet.vacuum-pump-vacuum-thermoforming

(2) Requirements for vacuum system according to the papermaking process From the working characteristics and characteristic curves of the ZBK11 wet four-leaf Roots vacuum pump, it can be clearly seen that the vacuum is in the range of 250-550 mmHg, and the curve is horizontal, and its essence is The pumping capacity of the pump remains essentially the same.

(3) Economical effect of using Roots vacuum pump The performance characteristics of Roots vacuum pump and water ring pump have been described in the previous chapters. What about the economic and technical benefits of the Roots pump and the water ring pump? This is also a concern of the paper industry. Take the practice of paper mills as an example to illustrate the following issues:

Roots vacuum pumps save energy. The Roots vacuum pump is highly efficient and is not generally comparable to a water ring vacuum pump. Rather, it means that the power consumed per unit of pumping capacity (so-called specific power) in the high efficiency zone (with a vacuum in the range of 100-200 mmHg) is much lower than that of the water ring pump. The reason is that the high-efficiency zone of the water ring pump is in the range of 400 mmHg of vacuum. In the paper machine net parts and felts similar to the factory, the vacuum requirements are less than 400mmHg, so the use of the Roots pump is the strength of the pump.Roots_Vacuum_Pump

Roots Vacuum Pump for Sale

The temperature rise of Roots vacuum pump refers to the difference between the highest temperature and room temperature measured in all parts of the pump exterior under the condition of stable operation of the limit vacuum or rated vacuum. The types of thermometers used to measure temperature rise are not limited, but they should have the measurement accuracy of <1 C. When marking the temperature rise, it should also indicate the room temperature at that time, the cooling conditions of the pump, including cooling methods, such as water cooling should indicate the temperature of the inlet and outlet water.vacuum-pump-in-vacuum-filtration

The outlet pressure of Roots vacuum pump refers to the pressure of measuring the jacket near the exhaust port corresponding to a certain inlet pressure value under the condition of stable operation of Roots vacuum pump. The outlet pressure can be measured at the same time as the pumping rate, starting from the appropriate value close to the limit vacuum until about the allowable inlet pressure of the pump. Measure the outlet pressure corresponding to each inlet pressure value.liquid_ring_vacuum_pump

The measuring position of the outlet pressure is specified in the standards issued by the Ministry. The distance between the pressure measuring tube and the flange of the pump outlet should not be greater than the diameter of the pump outlet, and the opening plane of the pressure measuring tube should be parallel to the direction of the airflow. The insertion depth is 1/4 d, but not greater than 50 mm.rotary-vane-vacuum-pumps

Vacuum Pump for Vacuum Furnace

To ensure high vacuum, besides reliable gas tightness and vacuum pipeline of furnace, appropriate vacuum pump equipment is also needed.vacuum-pump-paper-industry

The requirement of vacuum pump is put forward according to the condition of reducing period. After the pressure block is installed in the furnace and the furnace is closed, the air in the furnace must be extracted. Then, as the charge is heated, the inhaled and combined gases (water vapor and carbon dioxide) are separated from the briquette. When these gases precipitate at higher temperatures, they can greatly increase the blast furnace pressure and destroy the vacuum process, even in small quantities. In addition, when carbon dioxide and water vapor rush into hotter areas, gram reacts with silicon and precipitated water vapor. Therefore, it is necessary to ensure the rapid and full extraction of the released gas.Roots_Vacuum_Pump

Therefore, the vacuum pump should complete the following tasks: first, to ensure that a large number of gases are pumped out under normal pressure at the beginning of the cycle; second, to maintain a considerable gas extraction speed under low pressure throughout the operation cycle.rotary_vane_vacuum_pump

Liquid ring vacuum pump in vacuum conveying

The vacuum suction solid device is mainly composed of a nozzle, a feed pipe, a separator, a gas pipe, a dust remover and a vacuum pump.Roots_Vacuum_Pump

The liquid ring vacuum pump sucks solid powder materials and is characterized by reliable operation, simple structure, convenient operation and low noise. Since water is used as a medium, even if the air contains a small amount of dust, it enters the vacuum pump and is mixed with water, and is often discharged from the vent hole along with the water, and the wear on the pump is small. In addition, the particularly outstanding feature is that its working characteristic curve and suction process requirements are relatively close, which can ensure the smooth operation of the suction.vacuum-pump-system-in-metal-casting

When the degree of vacuum changes from 0 to 60%, the gas volume changes only between 695 and 616 m8/hour, and the rate of change is only 11.4%. Such a small change can satisfy the suction requirement.rotary_vane_vacuum_pump

In the vacuum suction, three kinds of liquid ring vacuum pumps are commonly used.

liquid ring vacuum pump by vacuum distillation

Correct Use of Cooling Tower and Cooling Condenser of Liquid Ring Vacuum Pump

We all know that the liquid ring vacuum pump usually uses water as working fluid, in the process of water suction and discharge to achieve the purpose of vacuum pumping. In the process of water suction and dispatch, because water strikes the pump wall, impeller and disc to do work and generate heat. If we continuously use water to suck in and drain out water, it will not produce water ring pump because of the increase of working fluid temperature. Vacuum decreases, but in many cases water or other working fluid is needed to be recycled. At this time, cooling towers or condensers are needed to make the liquid ring vacuum pump work normally.rotary-vane-vacuum-pumps

Cooling tower is a heat dissipation device, which uses the principle of evaporation and heat absorption of water to dissipate waste heat generated in industry or refrigeration and air conditioning to ensure the operation of the system. It can reduce the temperature of cooling water. Using this principle, we can solve the problem that the circulating liquid temperature of the liquid ring vacuum pump keeps rising and the vacuum degree is reduced. In the drainage port of the liquid ring vacuum pump, we connect a pipeline to the cooling tower, which reduces the temperature of the water by cooling the tower, and then let the water flow into the storage tank or pool so that the temperature of the circulating liquid can be controlled during the continuous working process of the liquid ring vacuum pump, thus solving the problem of the vacuum reduction of the liquid ring vacuum pump due to the increase of the temperature of the circulating liquid.liquid_ring_vacuum_pump

In the process of vacuum distillation or vacuum cooling, because the temperature of the exhausted gas is too high, the temperature of the liquid ring vacuum pump will rise, which will reduce the vacuum degree of the liquid ring vacuum pump, so we need to connect a condenser to the inlet of the liquid ring vacuum pump. After cooling, the temperature of the gas will decrease, and then it will be pumped into the liquid ring vacuum pump, which will solve the problem of vacuum drop caused by excessive temperature.roots-vacuum-pump-for-vacuum-casting

Vacuum Pump in Coal Mine

The vacuum pump used in coal mine is 2BV water ring vacuum pump. The maximum vacuum obtained is 3300 Pa. The pump can be started in tens of seconds. The drainage arrangement is shown in Figure 1. The water ring vacuum pump is an axial single-acting structure, the impeller and the pump body are installed relatively eccentrically. Therefore, when the impeller rotates, the water is thrown around by the impeller. Because of the centrifugal force, the water forms a closed water ring which is approximately equal thickness depending on the shape of the pump chamber. The inner surface of the upper part of the water ring is just tangent to the impeller wheel, and the inner surface of the lower part of the water ring is just right to the top of the blade. Contact (actually the blade has a certain insertion depth in the water ring). A crescent-shaped space is formed between the impeller wheel and the water ring. According to the blade, the impeller is divided into several closed chambers with different volume, which rotate with the impeller.liquid_ring_vacuum_pump


If the upper part of the impeller is used. As a starting point, the volume of the small chamber increases from small to large when the impeller rotates 180 degrees, and is connected with the suction port on the end surface. At this time, the gas is absorbed, and at the end of the suction, the small chamber is isolated from the suction port. When the impeller continues to rotate, the small chamber becomes smaller and compresses the gas; when the small chamber is connected with the exhaust port, the gas is discharged out of the pump. The suction pipe of the vacuum pump is connected with the first stage pump housing of the main pump. The drainage pipe of the vacuum pump guides the water in the pump room ditch. The water sealing pipe of the vacuum pump continuously supplies water to the vacuum pump for sealing, and a one-way valve is installed on the discharge pipe of the balance chamber. Before starting the pump, open the valve and then start the vacuum pump. At this time, the solenoid valve opens automatically and fills the pump. Four mine water pumping houses have designed a wall 1 m3 water tank for vacuum pump irrigation.rotary-vane-vacuum-pumps

2BV water ring vacuum pump can achieve centrifugal pump without bottom valve drainage, need to set up water tank, artificial irrigation, water demand is not much, but the vacuum pump and motor to occupy the ground area, and one with one. The start-up time of the two pumps is also different. Each mine can choose freely according to the actual situation, which can achieve economic operation, high efficiency and energy saving, and meet the requirements of (design code for underground drainage in coal mine).liquid-ring-vacuum-pump-for-food-processing

Vacuum Pump System in Vacuum Drying

Vacuum drying process is to place the dried material in a closed drying chamber, vacuum pumping system is used while heating the dried material continuously, so that the moisture in the material diffuses to the surface through pressure difference or concentration difference, and the water molecule obtains enough kinetic energy on the surface of the material. After overcoming the mutual attraction between the molecules, it escapes to the low-pressure space of the vacuum chamber and is thus heated. Vacuum pump pumping process. Vacuum drying can easily recover useful and harmful substances, and can achieve good sealing. From the point of view of environmental protection, vacuum drying is called "green drying" in vacuum state, the boiling point of material moisture decreases and the vaporization process accelerates, so it is especially suitable for materials sensitive to temperature and easy to decompose.Roots_Vacuum_Pump



Vacuum drying is mainly carried out in low vacuum area. In the process of grain moisture vaporization, its boiling evaporation temperature is proportional to the ambient pressure. The high moisture grain is placed in a sealed drying cylinder to form and maintain a certain degree of vacuum. At the same time, the grain in the drying cylinder is heated continuously, so that the moisture in the grain diffuses to the surface through the pressure difference. After vaporization, it is pumped out by a vacuum pump to realize continuous pairing in vacuum and low temperature. High moisture grain is dehydrated and dried. Vacuum drying reduces the boiling evaporation temperature of water from 100 C to below 40 C. Because the evaporation temperature is lower than the gelatinization temperature of starch, the grain will not be damaged. It avoids the expansion of grain and bursting waist, and ensures the quality of grain after drying. It guarantees that the original color, aroma, taste, nutrient composition and quality of the material are basically unchanged after drying. It is a real low-temperature drying, which is completely different from the general hot air low-temperature drying.roots-vacuum-pump-in-condenser

Vacuum freeze drying technology is to freeze the material first, then heat up under vacuum conditions, so that ice sublimation can achieve the purpose of post-drying. The heating methods adopted include infrared heating and microwave heating. The heat provided should not only sublimate the ice quickly but also damage the surface of the product. Vacuum freeze-drying technology can keep food fresh by vacuum atmosphere in the past 20 years. The packaging technology has developed rapidly. Because this kind of packaging not only has the characteristics of free oxygen to make food not easy to decay and deteriorate, fitted and inflatable packaging can not be harmed by insects and can inhibit the growth of mould, can improve and prolong the degree of food preservation and storage time, but also has the advantages of simple structure, easy operation, low price, low cost, elegant appearance and easy popularization of plastic packaging materials. There are many kinds of food in vacuum packaging, such as mustard pickles, turnips, kelp, sausage, grilled chicken, roast duck, soybean products, milk powder, wheat milk essence and so on. Because fresh products go through a long period of time from harvesting to reselling, it is easy to increase the selling price because of the serious loss. The promotion of vacuum packaging technology will reduce the price and refrigeration cost of fresh products, thus alleviating the spearhead between supply and demand. Therefore, vacuum preservation will become a potential market and be active in people's lives.rotary_vane_vacuum_pump

Liquid ring vacuum pump in vinyl ketone

Liquid Ring Vacuum Pump in the Production of Ethylene Ketone Advantages

The application of liquid ring vacuum pump in the production of acetone has at least the following advantages:rotary-vane-vacuum-pumps

First, the liquid ring pump can run continuously for a long time. Because transformer oil is used as circulating medium, transformer oil can not only produce oil ring to form vacuum and lubricate the pump body, so the liquid ring pump not only solves the problem of periodic maintenance of dry pump, but also can run without fault for a long time because of the low failure rate of the vulnerable parts of the pump body itself.buy-liquid-ring-vacuum-pump

Second, the liquid ring pump is an isothermal compression process, because the nature of ketone is very unstable, it greatly reduces the waste of materials. Whether it is a W-type reciprocating pump or a sliding valve pump, because the gas temperature rises during compression, it will produce a large number of divinyl ketone, acetic anhydride and other substances. When the temperature is too high, it will also produce a lot of coke-like substances.

Thirdly, it is safer to use the liquid ring pump to produce. It is decided by the working principle of the liquid ring pump that it will never have cylinder or cylinder leakage as often as the reciprocating pump, which greatly avoids the danger of cooling brine entering the system and greatly reduces the sudden vacuum drop and even the leakage of ethylene ketone caused by the sudden failure of the vacuum pump.liquid_ring_vacuum_pump

Fourth, the use of liquid ring pumps is more environmentally friendly, low noise and pollution, no need for regular maintenance, reducing the outflow of acetone.

What is a Roots vacuum pump?

The Roots vacuum pump is a two-rotor, positive displacement vacuum pump. There are two symmetrical rotors in the pump chamber, and the rotor has two-leaf, three-leaf and four-leaf shapes. The two rotors rotate in opposite directions to each other and are driven to rotate synchronously by the shaft end gears. The rotors are not in contact with each other, and the rotor and the pump chamber wall are also not in contact, and there is usually a gap of 0.15 to 1.0 mm therebetween, and the pump chamber is sealed by the gap.

Because there is no friction in the pump chamber of the Roots vacuum pump, the rotor can run at high speed, generally 1500~3000r/min, and it is not necessary to use lubricating oil, which can realize the oil-free cleaning process. The lubrication of the pump is limited to bearings and gears, as well as to the dynamic seal. The pump has no reciprocating parts, so a good dynamic balance can be achieved. Therefore, the Roots pump runs smoothly, the rotation speed is high, and the size is small to obtain a large pumping speed.rotary-vane-vacuum-pump-food-packaging

At present, most of the Roots vacuum pumps at home and abroad are horizontal structures. The intake port of the pump is on the top and the exhaust port is on the bottom. This horizontal structure has a low center of gravity and good stability at high speed. The two rotors of the Roots vacuum pump are relatively synchronously rotated by a pair of high precision gears.rotary_vane_vacuum_pump

Pumps are mostly direct-coupled, while large pumps are belt-driven. The motor and the transmission gear are arranged on both sides of the rotor shaft for easy installation and disassembly. The drive shaft transmits a large torque, the shaft has sufficient strength and rigidity, and the shaft and the rotor are firmly fixed. The sealing of the Roots vacuum pump is critical. The outer shaft of the drive shaft, the bearing of the two rotors and the pump chamber are provided with a dynamic seal, and the pump chamber and each end cover are provided with a static seal.

In order to avoid the misoperation of the Roots vacuum pump, a bypass relief valve is generally provided. According to the special needs of the Roots pump, the oil gear box, bearing and other components are separated from the pump chamber.

The heat generated during the compression of the Roots vacuum pump is transferred to the rotor and the pump body. It is difficult for the rotor to transfer heat to the outside of the pump, and the heat of the pump body is easily lost to the surrounding atmosphere. Thus, a temperature difference occurs between the rotor and the pump body. The thermal expansion of the rotor is exacerbated. When the pump load increases, the rotor expands and the gap disappears and is stuck. Therefore, an air-cooled Roots pump has emerged, which uses a cooled gas or atmosphere to directly cool the hot rotor, thereby reducing the temperature difference between the rotor and the pump casing, and improving the heat resistance of the Roots pump.Roots_Vacuum_Pump

This air-cooled Roots vacuum pump can be used for high pressure differentials and high compression ratios. The pump has a simple structure and the cooler is connected to the pump outlet for easy maintenance and replacement. Due to the uniform heat dissipation, the gap between the rotor and the pump body can be kept small, which is beneficial to the improvement of the pump volumetric efficiency.

Vacuum pump type

 A container is placed in the natural environment. If the internal gas pressure is not changed, the gas pressure inside and outside the container reaches an equilibrium state, which is equal to the atmospheric pressure. In order to bring the inside of the container to a vacuum, it is necessary to discharge the gas inside the container so that the internal gas pressure is less than the external atmospheric pressure. A device that removes gas from a container to obtain a vacuum by mechanical, physical, chemical, or physicochemical methods is called a vacuum pump. Vacuum pumps are classified into two types: compression type (variable volume type) and adsorption type according to their working principles. The compression type vacuum pump works by compressing the gas at the inlet end of the pump to the outlet end and discharging it to the outside of the pump.Roots_Vacuum_Pump

Common compression type vacuum pumps include: a rotary mechanical pump that utilizes a expansion-compression-discharge process, a turbomolecular pump that uses a turbine blade to remove gas, and the like. The working principle of the adsorption type vacuum pump is to adsorb the gas in the pump body, and the purpose of reducing the gas pressure has been achieved. Common adsorption vacuum pumps include: ion pumps that use ionizing suction, adsorption pumps that use physical or chemical adsorption, suction pumps, and cryogenic condensate pumps. The biggest difference between the adsorption type vacuum pump and the compression type vacuum pump is that the adsorption type vacuum pump does not discharge the gas outside the pump, but is stored in the pump. The former can achieve a higher degree of vacuum than the latter, but the pumping speed is small, and the applicable container is also small. The vacuum resistance furnace uses a compression type vacuum pump such as a mechanical pump, a Roots pump, and a diffusion pump.single-stage-liquid-ring-vacuum-pump-and-double-stage-liquid-ring-vacuum-pump

All kinds of vacuum pumps have their own working range. Some pumps can work directly from the atmosphere. For example, mechanical pumps and adsorption pumps, some pumps can't work directly from the atmosphere, such as diffusion pumps, molecular pumps, ion pumps. Wait, the inlet vacuum must reach a certain value before starting work.rotary_vane_vacuum_pump

Liquid Ring Vacuum Pump Plant

The liquid ring vacuum pump is an on-line operation, another standby, using the start-up of the liquid ring vacuum pump as operation instructions. Before starting, check whether the cooling water in the jacket sleeve of the imported pipeline is connected; whether the grounding wire is intact; whether the cooling water of the circulating liquid cooler of the vacuum pump is connected; whether there is overflow in the gas-liquid separating insert; check whether the import valve of the vacuum pump is closed (the vacuum pump checks this content when it is out of operation). After checking, start the vacuum pump according to the following steps:

1. Open the inlet valve of the vacuum pump;rotary-vane-vacuum-pumps

2. Start the vacuum pump and press the operation button (pay attention to observe and judge the operation of the vacuum pump).

liquid ring vacuum pump switching

When switching vacuum pumps, attention should be paid to prevent large fluctuations in vacuum, and the operation instructions should be switched to vacuum pumps. Before starting, check whether the cooling water in the jacket sleeve of the imported pipeline is connected; whether the grounding wire is intact; whether the cooling water of the circulating liquid cooler of vacuum pumps is connected; whether the gas-liquid separator is blown; and whether the inlet valve of vacuum pumps is closed. After the inspection, switch the vacuum pump according to the following steps:liquid-ring-vacuum-pump-china

1. Start the vacuum pump, press the operation button, observe the pressure indication, and then proceed to the next step when the vacuum degree reaches the given value.

2. Open the inlet valve of the vacuum pump slowly, and do the next operation after the vacuum degree indicates stability.

3. Close the inlet valve of the vacuum pump slowly.

4. Stop the operation of the vacuum pump and press the stop button.

5. Stop the cooling water of the circulating liquid cooler of the vacuum pump and close the feed and return valves. The switching of vacuum pump is completed.

Liquid ring vacuum pump system

The liquid ring vacuum pump system overcomes the characteristic of limit pressure difference when using a single liquid ring vacuum pump. It also has the disadvantage of low pumping rate under certain pressure, and can keep the liquid ring vacuum pump system working fast. At this time, the pumping rate is relatively large; liquid ring vacuum pump equipped with explosion-proof motor and electrical appliances, can also be based on the corresponding safety rules to remove flammable and explosive gases.Roots_Vacuum_Pump

In daily work, product quality is the most important, liquid ring vacuum pump must be planned shutdown. After that, it should also be noted that when the pump is shut down according to the management requirements, the person in charge of the unit must pay attention to the relevant procedures of shutdown approval four hours in advance. The first point is that when the higher power department, the company needs to stop its internal operation or line maintenance failure.

In addition, when the line in the mine fails, the maintenance will be closed; when the liquid ring vacuum pump needs to stop due to failure or regular switching; when the circulation pool needs to be replaced by water; welding and other accessories are replaced; in this case, due to other special circumstances or reasons, the vacuum pump needs to be closed.medical-air-compressors-and-vacuum-system

water ring vacuum pump Energy saving

Water ring vacuum pump and water ring compressor are products with high energy consumption and low efficiency. It is generally acknowledged that small pumps are generally 30-35% and large pumps are up to 40% or slightly higher. Therefore, inefficiency and the requirements of national mechanical and electrical products are extremely incompatible with China's current energy shortage.rotary_vane_vacuum_pump

Therefore, the optimal design method should be adopted as soon as possible to establish the mathematical model of each geometric parameter of impeller, which is the key to the efficiency of pump and the starting position of suction and discharge holes and regions. Optimal design should be made to select the best combination scheme of each parameter, and relevant theories and calculation formulas of vapor-liquid two-phase flow should be adopted to minimize the eddy current loss of water ring and improve efficiency. Objective.liquid_ring_vacuum_pump

Therefore, the design and development of high-efficiency water-saving ring vacuum pumps and compressors, as soon as possible to eliminate high energy consumption and low efficiency products is an important task for the design and development of water-ring vacuum pumps and manufacturers.

liquid-ring-vacuum-pump-in-canning-machinery

What is a rotary vane vacuum pump?

Rotary vane vacuum pump is a kind of oil seal rotary pump, also known as Gade pump, mainly composed of stator, rotor and slider. The rotor is eccentrically mounted in the stator and is tangent to the vertex of the stator inner wall. The rotor is equipped with two sliding vanes, which are tightly attached to the stator wall by the action of spring and centrifugal force during rotation. The stator is divided into suction chamber, storage chamber and exhaust chamber by the rotor and slider. As the rotor rotates and drives the slider, the suction chamber expands and sucks. The gas in the exhaust chamber is compressed gradually until the pressure exceeds the atmospheric pressure, the exhaust valve is opened and the gas is discharged into the atmosphere.rotary-vane-vacuum-pump-in-salt-industry

In order to prevent the exhaust gas reflux pump, the exhaust valve is specially covered with oil and sealed. Vacuum pump oil not only lubricates the stator, rotor and slider, but also seals them. In addition, the pump oil fills all harmful spaces in the pump chamber, eliminating their influence on the limit vacuum.

The ordinary rotary vane vacuum pump is mostly used to extract pure dry gas. If the gas containing a large amount of condensate gas is extracted, the rotary vane gas town (valve) vacuum pump should be selected. An air ballast valve is installed in the "air storage chamber". It opens and inhales a certain amount of air. Its partial pressure is several times higher than that of water vapor in the air extraction chamber. When it reaches the exhaust chamber, the partial pressure of water vapor is still lower than that of saturated vapor. Therefore, it will not condense into liquid droplets, but keeps the gas and air together to discharge out of the pump.

Rotary vane vacuum pump can be used as an independent equipment to obtain low vacuum. The limit vacuum is about 6.7x10-1Pa. It is widely used in vacuum metallurgy, vacuum transportation, vacuum casting, medical equipment, freeze-drying, vacuum impregnation, vacuum heat treatment and other industries. Rotary vane vacuum pump can also be used as the pre-pump and pre-pump of high vacuum pump, such as the pre-pump of oil diffusion pump, Roots pump, oil vapor jet pump, turbomolecular pump and sputtering ion pump. It can also be used in various fields of national economy.liquid_ring_vacuum_pump

Roots Vacuum Pump Details

Roots vacuum pump can transport tens of thousands of centimeters of liquid when it works. There are mainly two rotors with opposite rotating directions in the pump body, which are driven by a pair of synchronous gears. For Roots vacuum pump, the rotors mesh with each other in the pump body, but have clearance. Therefore, we should pay special attention to the following aspects when we use them.

1. Roots Vacuum Pump needs to check the oil level frequently and adjust it to meet the requirements when it does not meet the requirements.

2. The oil change period should be considered according to the actual operating conditions and whether the performance requirements can be met. In general, when pumping clean and dry gas, it is recommended to change oil once in about 100 hours.vacuum-system-in-plasma-spraying

3. Check the oil quality regularly, and replace the new oil in time to ensure its normal operation.

4. After 2000 hours of work, it should be repaired to check the aging degree of the gum seals, check whether the exhaust valve sheet is cracked, and clean up the dirt deposited on the valve sheet and the exhaust valve seat.

5. Clean the parts in the whole Roots vacuum pump chamber, such as rotors, rotary blades, springs, etc., and generally use gasoline to clean and dry them.

6. Add bearing lubricating oil to the bearing body, observe the oil level should be at the center line of the oil mark, and the lubricating oil should be replaced or supplemented in time.

7. Trial operation should be carried out after reassembly. Generally, it should run idly for 2 hours and change oil twice. Because there will be a certain amount of volatile substances in Roots pump when cleaning, and then put into normal operation after normal operation.

All working intensities must be within the range of flow and head of Roots vacuum pump indicated on the label to ensure that it can operate at the most efficient point and achieve the greatest energy-saving effect.Roots_Vacuum_Pump

Vacuum pump system price

In order to understand the market price of vacuum pump system, we should first understand the components of vacuum pump system, and then consider the market price of vacuum unit synthetically according to different configurations and many other factors. Vacuum pump system generally includes Roots water ring vacuum unit, Roots rotary vane vacuum unit, Roots reciprocating vacuum unit, Roots sliding valve vacuum unit, Roots water jet vacuum unit, diffusion pump unit and so on. Emphasis is put on the influencing factors of market price of Roots water ring vacuum unit and Roots rotary vane vacuum unit.

Influencing factors of market price of Roots water ring vacuum unit: its accessories are composed of Roots vacuum pump, water ring vacuum pump, control cabinet, vacuum meter, check valve, bellows and rack; the other parts are roots vacuum pump and water ring vacuum pump compression ratio calculation technology (different process requirements and different environmental effects), Roots vacuum pump and water ring vacuum pump material, plus It is composed of the degree of Engineering precision, spraying technology, rotating coupling test and technical appraisal of the unit, etc. They will affect the market price of Roots water ring vacuum unit. Roots vacuum pump occupies a leading position in the whole vacuum unit, if it can not produce qualified Roots pump, there is no vacuum unit.roots-vacuum-pump-manufacturing

Influencing factors of market price of Roots rotary vane vacuum unit: its accessories are composed of Roots vacuum pump, rotary vane vacuum pump, control cabinet, vacuum meter, vacuum valve, bellows and rack; the other parts are composed of rotary vane vacuum pump and Roots vacuum pump material, compression calculation technology, large-scale processing and production equipment, operation guarantee test of vacuum unit, etc. The wear resistance of rotary vane vacuum pump, the treatment of oil return injection and oil leakage, and the key manufacturing technology of Roots vacuum pump are all factors affecting the market price of Roots rotary vane vacuum unit.roots-vacuum-pump-used-in-vacuum-furnace