Introduction of air-cooled self circulating water ring vacuum pump unit

In the process of using water ring vacuum pump, because water is used as working fluid, and working fluid water is continuously injected into the pump, many users do not pay attention to environmental protection when directly working fluid (water) is discharged through the drain outlet of vacuum pump, which makes the waste of water resources and environmental pollution, and even increases the use cost of enterprises. Some users will make water tank for water ring vacuum pump alone or use soda separator at the upper position. The water ring vacuum pump will enter the water pump into the water tank or soda separator, and then it will be sucked into the pump cavity through the self-priming capacity of the pump itself, and then it will be discharged into the water tank to make the reciprocating cycle, but the working process of the water ring vacuum pump will generate heat, such as the invalid power heat of the vacuum pump and the heat of the vacuum pump As a result, the heat of the vacuum pump will be higher and higher in the water temperature of the water tank, and the higher the water temperature of the working fluid, the efficiency of the vacuum pump, many users will add water to the side of the water tank, so it will also lead to waste of water resources and environmental pollution.

In view of the above problems, the R & D team of Feiyao company independently developed the air-cooled self circulating water ring vacuum pump unit in combination with the characteristics of the water ring vacuum pump, cooled the circulating working liquid water through air cooling to ensure the water temperature requirements of the water ring vacuum pump, thus ensuring the service life of the water ring vacuum pump and zero discharge of the used working liquid (water).

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Development of screw vacuum pump

Screw vacuum pump is a kind of non-contact dry-type pump, which is an ideal kind of pump in the early 1990s. The core component is a pair of screw rotors with meshing clearance. There is no contact between metal and metal in the pump cavity, and the components in the air extraction cavity have no friction. The structure is simple and compact, and there are few vulnerable parts. It has the advantages of high vacuum, long service life, low energy consumption, no oil pollution, and small use site Point.

One lead of the screw vacuum pump is equivalent to the first stage pump, and the screw vacuum pump with multiple leads is equivalent to the multi-stage pump in series. Compared with the dry vacuum pump with multi-stage series connection such as claw vacuum pump and multi-stage Roots vacuum pump, the screw vacuum pump directly pushes the gas from the suction side to the exhaust side because there is no internal channel between the pumps at all levels, so the condensable gas, dust and The gas of particles is not easy to block and easy to clean. The single screw vacuum pump can realize the working range from 105Pa to 0.1pA. It has strong exhaust capacity, operates in dry mode, and is environmentally friendly. It is widely used in electronic, photovoltaic, pharmaceutical and chemical industries. The semiconductor industry is one of the most widely used screw vacuum pump industries.

In polysilicon preparation, semiconductor etching and other processes, corrosive gas and abrasive particles are often used or generated. In addition to the process that some products of semiconductors need particles, it is generally not expected that particles are mixed into the pump oil, but that the dry screw vacuum pump can meet the requirements except that particles are discharged from the pump. In the field of petroleum, chemical industry and biopharmaceutical industry, because there is no oil or water in the pump cavity, the dry screw vacuum pump is generally used as the pre-stage pump of the oil-free cleaning vacuum system to prevent oil pollution. Compared with the traditional processing technology, the vacuum degree is higher, the clean vacuum can be obtained, and the recovery of the intermediate volume agent can be realized, which has incomparable advantages in oil gas, solvent recovery and other aspects Potential. In the fields of electronics, vacuum coating, aviation, nuclear industry and so on, screw vacuum pump can pump out common air, inflammable and explosive gases, corrosive gases, especially to meet the requirements of high clean vacuum environment. In textile, metallurgy and other industries, the dry screw vacuum pump is more efficient and energy-saving than other types of vacuum pump in the process of vacuum defoaming and vacuum blowing decarburization (VOD) related to spandex, aramid, fiber and metallurgy.

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Why oil free vacuum pump is widely used

The oil-free vacuum pump has the advantages of simple structure, easy operation, convenient maintenance and no environmental pollution. In order to use oil-free vacuum pump products at ease, it is very necessary to choose a regular manufacturer to buy products, and for the sake of operation, it seems that we must follow the instructions in the manual! Today's products are suitable for many industries and have many advantages. The following is an introduction to the relevant information of the products:

The oil-free vacuum pump has good durability. It is a vacuum pumping, compression and dual-purpose vacuum pump. It is a basic equipment with a wide range of applications to obtain vacuum.

Compared with the oil pump, the oil-free vacuum pump has the advantages of low vacuum degree, small air volume, small size, easy installation, simple maintenance, convenient movement, no oil smoke and no environmental pollution, especially in the laboratory with high requirements. It is also one of the regular equipment in the laboratory. Therefore, when choosing oil-free vacuum pump, the vacuum degree required to work should be determined first. If the true degree of demand is high, the selected vacuum pump should be higher than the required vacuum degree, otherwise, it will fail to meet the requirements of vacuumizing. Secondly, the pumping rate of oil-free vacuum pump should be slightly higher than the required pumping rate in the selection, so as to meet the needs. See if the extracted gas is corrosive. The corrosive gas will corrode the pump. Special materials must be used to meet the requirements.

Oil free vacuum pump products are widely used because of its many advantages. And with the continuous progress of society, the product has made a qualitative leap in all aspects.

Water Ring Vacuum Pump

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Configuration of vacuum unit

Configuration of vacuum unit

Different vacuum systems require different vacuum degrees. Therefore, it is often necessary to complete by a set of vacuum units, that is, the vacuum pumps working in different pressure ranges are connected in series.

The vacuum pump on the high vacuum side can reach the vacuum degree required by the system, while the vacuum pump on the low vacuum side is directly discharged to the atmosphere. Obviously, the vacuum unit is a vacuum pump directly discharging the atmosphere. However, the high vacuum system generally needs three-stage units, and the medium vacuum system generally needs two-stage units.

It is difficult for a high vacuum pump and a low vacuum pump to form an effective high vacuum unit. There are several reasons for this. Flow continuity is one of them. The high vacuum pump has the limitation of pressure resistance of the front stage, that is, if the front stage is higher than a certain pressure, the pump cannot work normally. When the current stage pump reaches this critical pressure, the pumping speed will often decrease, so the exhaust flow of the former stage pump may be less than the exhaust flow of the main pump, and the inconsistent flow will destroy the requirements of flow continuity, which will inevitably cause the vacuum unit not to work normally. However, if another middle vacuum pump is connected between the high and low vacuum pumps, it can play a connecting role, with continuous flow, and each pump can work in the state. Roots pump can work in the middle vacuum range, which is suitable, so it is also called roots booster pump. Because of its low compression ratio, it can connect several PA to several hundred PA. When the three-stage high vacuum unit enters into a higher vacuum degree, because the exhaust flow of the main pump is significantly reduced, at this time, only a small front pump can maintain the continuity of pumping, which is often used in practice, so as to reduce the energy consumption of the unit.

Another reason why high vacuum units often need three-stage units is due to the limitation of suction pressure of high vacuum pump. All pumps have initial working pressure, and traditional high vacuum pumps are in the range of several PA. Therefore, the primary pump must be pre pumped to this pressure to start working. However, it often takes a long time for the front stage pump of direct exhaust to pump to this pressure, because the pumping speed of the pump is decreasing as the pressure decreases, especially for the vacuum unit with periodic pumping, there is a requirement for the time to reach the working vacuum degree. The longer the pre pumping time is, the longer the time to enter the working vacuum degree is. Therefore, adding a middle vacuum pump to cooperate with the front stage low vacuum pump can A short time to reach the main pump can work pressure, so that the system can enter the working pressure as soon as possible, to ensure the efficiency of the equipment.

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dry rotary vane vacuum pump characteristics and application

dry rotary vane vacuum pump characteristics and application

Features of dry rotary vane vacuum pump:

1. As the dry-type pump will not produce oil vapor gas, the environment of the production workshop and the items to be treated will not be polluted. It is a vacuum equipment used in the purification workshop and other industries.

2. Compared with water ring vacuum pump, water ring pump is limited by geography and resources, and causes serious waste of water resources. At the same time, the humidity in the production workshop will increase sharply, which is very easy to cause the goods to suffer from wet deterioration, while the dry pump does not have these problems.

3. Dry pump does not need oil and water, so compared with other vacuum pumps, regular maintenance work can be greatly reduced.

4. The dry-type pump adopts the high-speed operation of multiple blades, which avoids the pulse fluctuation of other vacuum pumps' suction and exhaust, and the transmission and suction are very stable.

Application scope of dry rotary vane vacuum pump:

Compared with the general vacuum pump, the dry vacuum pump is more widely used. It can be applied to:

Capsule filling, capsule printing, medicine mixing, conveying, vacuum drying and medicine packaging machine on pharmaceutical machinery;

Vacuum drawing, bag opening and loading on the automatic packaging line;

Low energy consumption vacuum suction on printing machine;

High efficiency vacuum filling of various liquid injection bottles;

Vacuum molding of various concurrent products; air tightness test of object surface in vacuum;

Vacuum delivery and pasting of labels of cartons and bottles;

Rotary Vane Vacuum Pump

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reciprocating vacuum pump Overview and principle

reciprocating vacuum pump Overview and principle

Limit vacuum of reciprocating vacuum pump (also known as piston vacuum pump), single stage is 4 x 102pa-103pa, double stage can reach 1pA, pumping speed range is 45m3 / h-20000m3 / h, which is used to extract gas from sealed container. The degree of extracted gas is not more than 35t. If auxiliary equipment, such as freezer, is added, swallow gas can also be extracted. The reciprocating vacuum pump has a large exhaust T, which is mainly used for vacuum impregnation, liquid steel vacuum treatment, vacuum distillation, vacuum Yanfa, vacuum concentration, vacuum crystallization, vacuum dry bath, vacuum filtration and vacuum operation of concrete.

Reciprocating vacuum pump is not suitable for pumping corrosive gas or gas containing granular dust. If there is dust in the aspirated valve, a filter must be installed at the inlet of the pump.

The oil-free reciprocating vacuum pump uses the piston ring and sealing ring of self-lubricating material, so there is no need to add oil for lubrication in the cylinder; an oil separation chamber is added between the cylinder and the engine body (its length is greater than one stroke length) to prevent the lubricating oil in the engine body from leaking into the cylinder along the piston rod, so the pump pairs the pumping system. Oil free reciprocating vacuum pump has vertical and horizontal structures.

The working principle of reciprocating vacuum pump is mainly composed of cylinder and piston which do reciprocating linear motion. The driving of the piston is done by the crank connecting rod. In addition to the above main components, when the exhaust valve and the suction valve are in operation, the piston in the cylinder will do reciprocating motion under the drive of the motor through the function of the crank connecting rod mechanism. When the piston moves from the left end to the right end in the cylinder, as the volume of the left cavity of the cylinder increases continuously, the density of the gas in the cylinder decreases, and the process of air extraction is formed. At this time, the gas in the container enters the left cavity of the pump body through the suction valve. When the piston reaches the right position, the cylinder is completely filled with gas. Then the piston moves from the right end to the left end, and the suction valve is closed. The gas in the cylinder is gradually compressed as the piston moves from right to left. When the pressure of the gas in the cylinder reaches or slightly exceeds the atmospheric pressure, the exhaust valve 4 is opened to exhaust the gas to the atmosphere and complete a working cycle. When the piston moves from left to right again, it sucks in a part of gas, and repeats the previous cycle, and so on, until a stable equilibrium pressure is reached in the pumped container.

Water Ring Vacuum Pump

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High frequency discharge in vacuum system

High frequency discharge is the discharge form caused by the existence of high frequency alternating electric field between two electrodes. When alternating voltage is applied to both ends of the discharge tube, the electrons and positive ions in the gas will generate additional harmonic vibration under the action of alternating electric field. Because the mass of positive ion is much larger than that of electron, the amplitude of harmonic vibration is very small. When the frequency is low and the amplitude of harmonic vibration is far greater than the distance between the two poles, the electron goes through the whole process of collapse, discharge and extinction in each half cycle, and the discharge condition is the same as that of DC. When the frequency is high, the amplitude of the harmonic vibration is much smaller than the distance between the two poles, and the ionization ability of the electron will be greatly enhanced because of the constant back and forth motion of the electron. Because of the small amplitude of the electronic harmonic vibration, the number of electrons entering the electrode will be greatly reduced. In this way, the electrons of gas self-sustaining discharge will not be provided by the secondary electrons produced by the electrode, but by the electrons produced by ionization when the electrons move back and forth. At this time, although a small number of positive ions and photons bombard the electrode to produce secondary electrons, the vibration direction of the secondary electrons is sometimes the same as the direction of the electron flow into the electrode, sometimes the opposite, because the polarity of the two electrodes is constantly changing. Therefore, it is not conducive to ensuring self-sustaining conditions.

This kind of high-frequency discharge, as long as there is a high-frequency electric field, can be formed. It is not necessary to use electrodes, so it is also called electrodeless discharge. The electrodeless discharge can be formed not only in alternating electric field, but also in alternating magnetic field. Because the alternating magnetic field can produce a disastrous electric field, the electrons in the gas produced by the residual ionization accelerate around the magnetic field line under the action of the eddy electric field, resulting in a large number of ionization. When the magnetic field direction is along the axis of the discharge tube, the eddy electric field will gradually weaken along the radius direction, and the ionization ability of electrons will also weaken along the radius direction, thus forming the concentration gradient of electrons and ions along the radius direction. Under the action of concentration gradient, electrons and ions diffuse from the axis to the tube wall. Because the electron diffusion is faster than the ion diffusion, the positive potential appears at the axis and the negative potential appears at the tube wall, which in turn produces the electrostatic field from the axis to the tube wall. Therefore, there are two kinds of electric fields in the discharge tube, one is the eddy electric field around the magnetic field line, the other is the electrostatic field from the axis to the tube wall. Under the simultaneous action of these two electric fields, electrons move around the axis and expand towards the tube wall, resulting in a series of concentric rings. Due to the different energy levels and numbers of electrons excited on different radii, rings with different radii have different colors.

The ignition voltage of high frequency discharge is the amplitude of the alternating potential difference on the electrode when the discharge occurs. The amplitude of this voltage is lower than the ignition voltage of DC discharge. The electric field strength of high frequency breakdown is related to air pressure. The higher the air pressure is, the stronger the breakdown electric field is and the higher the breakdown frequency is. High frequency discharge is widely used in radar and pulse technology.

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