Precautions for the use of liquid ring vacuum pumps?

This is the precautions for the use of our unit, which is summarized by ourselves for the problems that often occur in users, and should have a certain reference value, I hope it will help you.

Precautions for the use of corrosion-resistant vacuum pumps.

1. The new device is prone to impurities, and the suction pump will cause damage to the impeller and pump casing.

2. The installation should be horizontal and firm, and the pipeline should not be heavily pressed on the pump.

3. When opening, there should be a certain amount of circulating liquid in the pump chamber (the liquid occupies the volume of the pump chamber 2 3, not too much or too little), otherwise it is easy to cause damage to the mechanical seal.

4. The best way of water supply is to use a closed-circuit circulation system or a water tank to supply water smoothly under normal pressure, and it is not possible to supply water under positive pressure or use tap water pipelines.

5. Choose a circulating fluid with good fluidity and less affected by temperature (it is best to use water as circulating fluid).

6. Check the bearings regularly to avoid damage to the equipment caused by lack of oil.

7. The line of the pump exhaust port shall not be higher than 1 meter (counting from the flange port).

8. When there is a sound in the pump chamber, it means that the ultimate vacuum has been reached and cavitation has occurred, and the inlet valve should be opened to enter the appropriate amount of atmosphere.

9. Pumps with motors of more than 11 kilowatts should be equipped with step-down starts.

10. When the pump stops running, the valve at the inlet of the circulating water of the pump must be closed, and the circulating water in the pump chamber should be emptied in winter.

11. The working environment temperature of the equipment should not be too high, and the equipment should not be exposed to the sun.

Use of vacuum tanks:

1. When turning on the pump, open the ball valve on the vacuum tank and close the venting valve.

2. When stopping the pump, close the ball valve on the vacuum tank, open half of the venting valve, and then close the circulating water valve into the vacuum pump, and then stop the pump.

First, pay attention to water volume and water level control;

The second is water quality, hard water, unfiltered impurity water is easy to produce scale, affecting the intermittent impeller and pump body, easy to increase the rotation resistance, causing temperature rise, excessive current, etc.

The design is more critical, it should be implemented according to the standard, pay attention to the pipeline system can not be mixed with impurities during installation, and pay attention to the medium situation when starting the shipment.

Summary. The water ring vacuum pump will produce a certain amount of water vapor and water during the working process, which needs to be discharged by discharge. The following is the method of air and water discharge of water ring vacuum pump:

1.Drain water: After the vacuum pump stops running, open the drain valve of the water ring vacuum pump to discharge the water.

The frequency of water discharge depends on the use of the water ring vacuum pump and the working environment. 2.Exhaust gases:

After the vacuum pump stops running, open the gas discharge valve of the vacuum pump and discharge the gas. The frequency of the discharge gas depends on the use of the water ring vacuum pump and the operating environment. It should be noted that when discharging water and gas, the position of the discharge port should be lower than the air inlet of the water ring vacuum pump to prevent gas and water from backing up to the inside of the vacuum pump.

In addition, protective gloves and goggles should be worn when venting moisture and gases to avoid injury.

The water ring vacuum pump will produce a certain amount of water vapor and water during the working process, which needs to be discharged by discharge. The following is the method of water ring vacuum pump gas and water discharge:1

Drain water: After the vacuum pump stops running, open the drain valve of the water ring vacuum pump to discharge the water. The frequency of water discharge depends on the use of the water ring Naming Dan vacuum pump and the working environment.

2.Exhaust gas: After the vacuum pump stops running, open the gas discharge valve of the vacuum pump and discharge the gas.

The frequency of the discharge gas depends on the use of the water ring vacuum pump and the operating environment. It should be noted that when discharging water and gas, it should be ensured that the position of the discharge port is lower than the air inlet of the water ring vacuum pump to prevent the gas and water from backflowing into the vacuum pump. In addition, protective gloves and goggles should be worn when venting moisture and gases to avoid injury.

The working principle of the water ring vacuum pump is that the water ring pump relies on the change of the pump chamber volume to achieve suction, compression and exhaust, so it belongs to the variable volume vacuum pump. The impeller is eccentrically installed in the pump body, when the impeller rotates, the water entering the water ring pump body is thrown around by the impeller, and due to the action of centrifugal force, the water forms a closed water ring of equal thickness similar to the shape of the pump cavity.

The upper inner surface of the water ring is tangent to the impeller hub, and the lower inner surface of the water ring is in contact with the tip of the blade. At this time, a crescent-shaped space bucket is formed between the impeller hub and the water ring, and this space is divided into several small cavities equal to the number of blades by the impeller. If the upper 0 ° of the impeller is taken as the starting point, then when the impeller rotates 180 ° before rotation, the volume of the small cavity gradually changes from small to large, the pressure is continuously reduced, and it is communicated with the suction port on the suction and exhaust plate, when the pressure in the small cavity space is lower than the pressure in the pumped container, according to the principle of gas pressure balance, the pumped gas is continuously pumped into the small cavity, and it is in the suction process at this time.

When the suction is completed, it is isolated from the suction port, from the - to the - section, the volume of the small cavity is gradually decreasing, the pressure is constantly increasing, and it is in the compression process at this time, when the compressed gas reaches the discharge pressure in advance, it is exhausted in advance from the auxiliary exhaust valve.

What should I pay attention to when using the water ring vacuum pump in winter? The machine introduces you to the maintenance method of vacuum pump in winter.

1.Do not use in an excessively cold environment.

2.It can be properly warmed up before use.

3.Add bearing lubricating oil to the bearing body, observe the oil level should be at the center line of the oil standard, and the lubricating oil should be replaced or replenished in time.

4.Close the gate valve of the outlet pipeline, the outlet pressure gauge and the inlet.

Vacuum gauge. 5.Jog the motor and try to see if the motor is steering correctly.

6.If you find that the vacuum pump has abnormal sound, you should stop it immediately and take it to check the cause.

7.Try to control the flow of the vacuum pump and.

Head. Within the range indicated on the signage, to ensure that the vacuum pump operates at the highest efficiency point, the maximum energy saving effect can be obtained.

8.Adjust the packing gland frequently to ensure that the drip situation in the packing chamber is normal, and it is advisable to leak out the dripping.

9.If the vacuum pump is out of use for a long time, it is necessary to disassemble the pump, wipe off the water, coat the rotating parts and joints with grease, and keep them properly.

10.Regular check-ups.

Sleeve. The wear and tear of the grinding should be replaced in time after the loss is large.

11.When the vacuum pump is used in the cold winter Lingla Festival, the lower part of the pump body needs to be drained with water after stopping.

Screw plugs. Unscrew and put the medium clean to prevent.

Freeze cracking. 12.When the vacuum pump is to be stopped, close the gate valve and pressure gauge first, and then stop the motor.

13.The vacuum pump is oiled after 100 hours of operation within the first month of operation, and then every 500 hours.

Clause.

1. Always pay attention to whether the pump is running normally, whether there is any special sound, and whether the motor is overloaded.

Clause. 2. Pay attention to whether the cooling water is interrupted.

Clause. 3. Always pay attention to the oil level.

Clause. Fourth, if the temperature of the rotary vane vacuum pump is to drop below 5 after stopping, the cold water in the pump must be removed.

Clause. 5. Note that the temperature rise of the pump does not exceed 40

Clause. 6. After the pump starts, slowly open the valve.

Pay attention to the change of suction inlet pressure, the suction inlet position of the vacuum pump is determined, the pressure ratio is certain, the inlet pressure is high, although the outlet has a rubber ring for overpressure protection, but it is still easy to overload, in addition, pay attention to the liquid level of the pump working liquid, too high will cause starting difficulties or overcurrent operation.

I don't pay much attention to it, the main thing is that there can be no shortage of oil, and the voltage must match.

It depends on what type of vacuum pump it is.

(1) Before normal operation, the vacuum pump should be put into a test run to check whether the vacuum pump has abnormal vibration and impact sound. The ultimate pressure of the vacuum pump should also be measured for the first time and should comply with the technical specifications. Under the condition of long-term working of the vacuum pump, the temperature of the vacuum pump should not exceed 70 degrees.

Determination of dry pumping velocity. It is more complicated and generally not examined.

2) A mechanical vacuum pump that requires cooling water. The cooling water should be turned on before starting. The outlet water temperature of the cooling water should not exceed 30 degrees.

3) The pipeline between the continuous vacuum pump and the pumping system should be as short and thick as possible, and the inner diameter of the pipeline should generally not be small in the diameter of the air inlet of the dry vacuum pump, so as to avoid the pumping rate being affected by the resistance of the dry pipeline.

4) In order to keep the work room clean and hygienic, which is conducive to the health of the dry staff, the exhaust gas should be directly led to the outdoors by leather pipe.

5) When the vacuum pump does not work for a long time or the ambient temperature is low, it may cause difficulty in starting, at this time, the air intake port of the vacuum pump should be ventilated to the atmosphere, and the pulley should be rotated with Feng (not Jia is connected to the power supply to rotate the vacuum pump for several weeks before starting. If it is directly connected to the vacuum pump, the motor can be continued several times, and the oil storage in the vacuum pump chamber can be discharged into the oil tank, and then it can be started. If this is not possible, the vacuum pump can be heated directly with radiant heating or infrared lamps until it can be moved.

6) Before use, check whether the oil of the mechanical vacuum pump reaches the position of the oil mark line of the window. At the same time, the direction of rotation of the motor pulley must be checked. The observer is facing the pulley, the pulley should rotate in the clockwise direction, if it rotates in the opposite direction, any two-phase joint in the phase power supply can be replaced.

Otherwise, the rotary vane vacuum pump will not pump the air but will inject the vacuum pump oil and atmosphere into the pumping system, causing serious pollution.

7) After the work is over. The high vacuum valve should be closed first, and then the low vacuum valve. The rotary vane vacuum pump is then stopped and then deflated (if an electromagnetic vacuum with a degassing valve is used, it can be automatically deflated) to prevent the oil from returning to the vacuum system, and finally the main power supply is cut off. Stop the water.

8) Pay attention to prevent hard substances (metal shavings, glass fragments, etc.) from falling into the vacuum pump and scratching the moving parts of the vacuum pump. When the vacuum pump is out of use for a long time, it should be stored in a dry and clean environment, and the suction and exhaust ports should be blocked to prevent dirt from falling in.

9) When dismantling, washing and assembling the mechanical vacuum pump, it is necessary to pay attention not to damage the sealing surface, do not lose the screws, and blow dry or dry the parts that are cleaned and earned (the temperature should not be too high and the time should not be too long. When assembling, the vacuum pump wall is smeared with a small amount of grease to remove the dead space as much as possible.