What is an air-cooled Roots vacuum pump

Air cooled roots vacuum pump is a kind of Roots vacuum pump which can operate continuously under high pressure difference without overtemperature. It also has the advantages of high speed and small volume of ordinary roots vacuum pump. Its work and capital depend on the mechanical strength of the pump itself.

Air cooled roots vacuum pump adopts three blade rotor profile, which has large volume utilization coefficient and small volume. Equipped with a suitable motor and condenser, it can be started at any pressure or operated at any differential pressure. The air-cooled Roots vacuum pump can be used alone or form a unit. In some cases, that is, in the middle stage of the unit, the air-cooled Roots vacuum pump relies on the cooler outside the pump to achieve heat balance. If it is used as the end stage of the unit or separately, it can be cooled by air without condenser.

The pump and unit can reach various limit pressures and working pressures. Air cooled roots vacuum pump and unit 1 can be selected under the following conditions.

1. The load is very large;

2. Short extraction time;

3. High pumping speed is needed from low vacuum to high vacuum;

4. It is necessary to avoid the situation of ordinary pump working medium.

The pump and unit can be widely used in vacuum melting, vacuum drying, vacuum impregnation, vacuum distillation, vacuum degassing, aviation simulation experiment, gas transmission, vacuum suction, power station dust removal and other vacuum operations.

1、 How it works

When the air-cooled Roots pump is running, the extracted gas is vertically inhaled and vertically discharged. There are cooling air outlets at both ends of the pump to provide cooling air for the pump or use a cooler for cooling.

During the operation of the air-cooled pump, the rotor is driven by two synchronous gears, which rotate synchronously and reversely in the pump body, forming the process of upper air inlet, side air conditioner and lower air exhaust. Through the dynamic balance test, the rotor runs smoothly, the gearbox and lubricating oil are completely separated from the working chamber, and the working chamber is free of oil.

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Characteristic curve of water ring vacuum pump

For different types of water ring vacuum pumps, the suction volume flow curve is related to the suction volume cavity and the size of suction port: when the suction port is small and the suction volume cavity is relatively large, the suction volume flow increases with the increase of suction pressure; When the suction volume cavity is relatively small, with the increase of suction pressure, the suction volume flow will be full of the whole cavity when the suction volume flow increases to a certain value. When the suction port is large and the suction volume cavity is relatively small, the speed of air filling the cavity is faster to keep the suction volume flow unchanged. When the inspiratory pressure increases to a certain value, the inspiratory pressure in the volume cavity will increase and the inspiratory volume flow will decrease due to the constant inspiratory volume cavity and the continuous increase of the maximum flow rate of the inspiratory gas.

When the water ring pump is running, its suction temperature, working water temperature and suction cavity remain unchanged. According to the gas state equation PV = MKT, the suction mass flow is basically proportional to the suction pressure, that is, P1 / P'1 ≈ M1 / m'1

According to the relationship between inspiratory mass flow and inspiratory volume flow, with the increase of inspiratory pressure, inspiratory volume flow begins to increase, and then slowly decreases.

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Vacuum pump in vacuum grouting technology

Vacuum grouting is a commonly used technology in bridge concrete structure, and grouting is a key link. The traditional grouting technology will cause corrosion and component expansion crack after long-term use, which has a great potential safety hazard.

Vacuum grouting is a new technology in the construction of post tensioned prestressed concrete structure, which solves the problems left by the traditional grouting technology to a large extent. The adoption of vacuum grouting technology is an effective measure to improve the safety and durability of post tensioned prestressed concrete structure.

The main application of vacuum pump in vacuum grouting is that one end of the duct is vacuumized by vacuum pump to produce a vacuum of about - 0.1pA, and then the optimized special cement slurry is poured from the other end of the duct to fill the whole duct with a positive pressure of ≤ 0.7MPa to improve the fullness and compactness of the prestressed duct grouting.

Main technical advantages

1. In the vacuum state, the air and water in the duct and the bubbles mixed in the cement slurry are eliminated to reduce the porosity and bleeding.

2. In the process of grouting, the duct has good sealing performance, so that the slurry can keep pressure and fill the whole duct.

3. The optimization of technology and slurry can eliminate the generation of cracks and ensure the fullness and strength of grouting.

4. The vacuum grouting process is a continuous and rapid process, which shortens the grouting time.

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The working principle of different types of vacuum pump

The working principle of different types of vacuum pump

Different types of vacuum pumps have different functions and working principles, and the specific processes used are different. In this paper, the specific functions of various vacuum pumps are described as follows:

1. The working principle of Roots vacuum pump is: it has a pair of soled rotors with synchronous high-speed rotation, because of the continuous rotation of the rotors, The extracted gas is sucked into the gap between the rotor and the pump shell from the air inlet and discharged through the exhaust port. Since the gap is completely closed after suction, the gas in the pump cavity is not compressed and expanded. However, when the top of the rotor turns around the edge of the exhaust port and the gap is connected with the exhaust side, because of the high pressure of the gas in the exhaust side, a part of the gas in the side flows back into the gap, making the gas When the rotor continues to turn to the outlet, the gas is discharged out of the pump.

2. The function principle of water ring vacuum pump is: the impeller is eccentrically installed in the nearly circular pump body. When the impeller rotates clockwise, the water injected into the pump body forms a rotating water ring due to the centrifugal effect, and a crescent shaped space is formed between the inner surface of the water ring and the impeller hub. When the space increases, the gas is inhaled from the outside. When the impeller continues to rotate, the corresponding space becomes smaller, and the original suction is made When the pressure reaches or slightly exceeds the gas pressure, the gas is discharged.

3. The working principle of reciprocating vacuum pump is: it uses the reciprocating motion of piston to pump air. This kind of pump has poor continuity and is relatively simple.

4. The principle of the steam jet pump is: the medium pressure steam of 8-12kg / cm2 is expanded through the heat insulation of the nozzle, the speed is increased to more than 1000m / s, the secondary steam and non condensable gas are sucked into the mixing chamber, after the secondary steam and non condensable gas are sucked and mixed with medium pressure steam, the speed is increased to about 200m / s, the medium pressure steam carrier inhales the steam into the diffuser, and the mixed steam is compressed and decompressed in the compressor After that, discharge the pump. The imported steam jet pump has high concentricity, good material and ingenious nozzle design. At present, the domestic steam jet production technology cannot be compared with the imported advanced steam jet.


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Introduction to the connection mode of water ring vacuum pump

1. When wrapping with polyester insulating tape, it is necessary to press half of the first circle, wrap 8-12 layers. After wrapping with water ring vacuum pump, wrap two layers with plastic tape for strength.

2. Strip the copper core of the cable on the water ring vacuum pump about 30-35mm long, and wipe the copper wire with abrasive cloth to make it bright. Similarly, strip the copper wire of the external three-core cable 30-35mm, and wipe it with abrasive cloth.

3. Insert the three core cable and the stripped copper wire part of the external cable in pairs, then bind and tie with a thin copper wire as shown in the figure, cut off the remaining part, and press flat with scissors to prevent tying.

4. The three wire ends shall be firmly welded with solder respectively, and the surface of the solder joint shall be smooth without burr and false welding. If the welding is not firm or smooth, the water ring vacuum pump shall be re welded until the requirements are met.

5. Wrap three wires together with plastic tape and bind two layers. The first layer shall be more than 50mm over the end of each conductor insulation layer and the second layer shall be more than 50mm over the end of the first layer.

6. After binding, take a basin of cold water to soak the wrapped thread in water safely. After 12 hours, use a 500V megohmmeter to measure the insulation not less than 50 megohm. Otherwise, bind it again until it meets the requirements.

7. The grounding wire of the water ring vacuum pump shall also be wrapped according to the wiring process requirements of the submersible cable.

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Common troubles of water ring vacuum pump

Water ring vacuum pump in use after a period of time there will be some failures, water ring vacuum pump common failures?

1、 Insufficient water ring vacuum pump

Possible causes: insufficient power supply of motor leads to insufficient speed; insufficient water supply; excessive clearance between impeller and distribution board; mechanical seal damage leads to water leakage and air leakage; impeller wear is too much; circulating water cannot be discharged.

Troubleshooting: check whether the power supply voltage is within the rated voltage range of the motor; increase the water supply (it must be controlled within the correct range, otherwise the motor will be overloaded and heated); reduce the clearance between the impeller and the distribution board (generally 0.15-0.20mm); replace the mechanical seal; replace the impeller; check the pipeline at the water outlet.

2、 It can't be started or it's noisy

Possible causes: insufficient power supply voltage of the motor; lack of phase operation of the motor; corrosion of the water ring vacuum pump due to long-term failure; suction of debris in the pump; impeller drag distribution board.

Troubleshooting: check whether the power supply voltage is too low; check whether the motor wiring is reliable; if the pump is not used for a long time, add a little rust remover or open the pump cover to remove the rust manually; open the pump cover to remove the sundries; adjust the distance between the impeller and the distribution board.

3、 Motor overheating

Possible causes: motor overload due to excessive water supply; motor phase loss; exhaust hole blockage; impeller driving other components.

Troubleshooting: reduce the water supply to the normal range (refer to the pump's operating instructions for the liquid supply); check whether the wiring is firm; check the exhaust port; open the water ring vacuum pump cover to adjust the clearance between the impeller and other components.

4、 Insufficient flow

Possible causes: pipeline air leakage and liquid leakage; increase of resistance loss;

Troubleshooting: check the mechanical seal at the connection; check the pipeline and check valve for failure.

The above is the main reason for the common failure of water ring vacuum pump.

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How does the vacuum unit work?

The roots vacuum pump needed by roots vacuum unit can't directly exhaust the atmosphere. For example, the pressure difference between the suction port and the exhaust port of Roots vacuum pump will be too large, which will overload the roots vacuum pump. For example, simply increasing the motor power of Roots vacuum pump will form the overheating of roots vacuum pump, which will cause the tiny gap between the roots vacuum pump rotors to get stuck quickly due to thermal contraction.

In order to ensure that the roots vacuum pump can reach a higher vacuum, the gap between the rotors of Roots vacuum pump must be ensured. Therefore, the roots vacuum pump must be equipped with a front-end pump when it is used. When the pressure in the system is pumped to a certain range, the roots vacuum pump can be started again, so as to prevent the overload of Roots vacuum pump. The front stage pump can select water (liquid) ring vacuum pump, rotary vane vacuum pump, slide valve vacuum pump, reciprocating vacuum pump and other vacuum pumps that can directly exhaust the atmosphere.

In general, water ring pump is more advantageous than other vacuum pumps in Roots vacuum unit. This is mainly because it can pump a lot of condensable steam, especially when the mechanical vacuum pump of gas ballast oil seal can not remove condensable steam, or the solvent used can make the pump oil deteriorate and affect the performance, or when the vacuum system does not allow oil pollution, it is more obvious Obvious.

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