How to eliminate common faults of rotary vane vacuum pumps?

Methods of troubleshooting rotary vane vacuum pumps:

If the rotary vane vacuum pump is not operated properly, there will often be failures, such as the vacuum degree of the rotary vane vacuum pump decreases, oil injection, smoke, oil leakage at the oil seal, noise, etc., and the vacuum pump oil emulsification in the pump. In case this happens, don't panic at first, and eliminate the faults one by one after the shutdown. Here are a few ways to troubleshoot.

1. Smoke and oil injection from rotary vane vacuum pump: refers to smoke or oil injection from the exhaust port of rotary vane vacuum pump during operation.

1. Smoke, if the pump has just started to run and there is a phenomenon of smoking, it is normal, if it is smoking for a long time, it is abnormal. Solution: Smoke indicates that the air inlet of the pump, including pipes, valves, and containers, has been repaired.

After the leak detection, I deal with it, and the smoke will end. Vortex flowmeter.

2. Fuel injection, indicating that there are a large number of leaks outside the air intake, and even the air inlet is exposed to the atmosphere. Solution: Seal the air inlet of the pump to make the pump run, if you don't inject fuel, it means that there is a leakage; If the exhaust valve is damaged, check whether the exhaust valve is damaged and replace the broken exhaust valve.

2. Rotary vane vacuum pump noise: This refers to the noise of the pump.

1. Knock on the cylinder, the pump makes an irregular sound when it runs, like the sound of metal hitting metal. This is the sound of the rotary vane striking the pump. This condition is mainly caused by the spring break between the paired rotors or the failure of shrinkage or ejection.

Solution: Open the pump to check if the rotary vane spring is damaged. Replace the springs.

2. The noise of the exhaust valve is mainly due to the damage of the exhaust valve of the pump. The solution: replace the exhaust valve plate.

3. The vacuum degree of the rotary vane vacuum pump decreases: it means that the vacuum degree of the rotary vane vacuum pump measured at present is lower than the factory index or the vacuum degree when it was used before. There are many reasons for low vacuum, but here are a few of the main ones.

1. The brand of rotary vane vacuum pump oil added this time is different from the original. Different vacuum pump oil grades, because the saturated vapor pressure in different grades of oil is different, so the results are different. The solution:

Replace the correct new vacuum pump oil according to the model specification of the product.

2. In addition, it is also due to the low vacuum degree caused by the vacuum pump oil, that is, the vacuum pump oil is emulsified and discolored, or too dirty. Solution: Put all the vacuum pump oil in the pump, replace the same type of vacuum pump oil, and solve the problem that the water vapor and impurities in the pumped gas do not enter the pump.

3. The temperature of the pumped gas may be too high. The solution: reduce the temperature of the pumped gas, or add a corresponding heat exchanger.

4. The oil circuit in the pump is not open or smooth, and a certain amount of oil is not maintained in the pump chamber. Solution: Check whether the oil circuit is unblocked, and add the same type of vacuum pump oil.

5. The gap of the fit is increased. This is due to the fact that the gas that has been pumped for a long time contains dust, etc., which causes the gap between the rotary vane and the stator to increase after wear. Solution: Check whether the gap is too large and replace it with new parts.

The common faults and troubleshooting methods of rotary vane vacuum pumps are as follows:

1.Pump body leakage: Check the pump body seal for aging or damage, and replace the seal if necessary.

2.Pump oil contamination: Check whether the pump oil is contaminated, if it is contaminated, the pump oil needs to be replaced.

3.Insufficient pump oil: Check whether the pump oil is sufficient, if it is insufficient, you need to add pump oil.

4.Pump bearing damage: Check whether the pump bearing is damaged, if it is damaged, the pump bearing needs to be replaced.

5.Wear of the rotary vane: Check whether the rotary vane is worn, if it is worn, it needs to be replaced.

6.Motor failure: Check whether the motor is working normally, if it is not normal, the motor needs to be repaired or replaced.

7.Excessive gas in the pump: Check whether there is too much gas in the pump, if too much needs to be vented.

8.Overheating of the pump body: Check whether the pump body is overheated, if it is overheated, it needs to be shut down for cooling.

When troubleshooting, it is necessary to pay attention to safety and avoid accidents caused by improper operation. At the same time, the rotary vane vacuum pump needs to be regularly maintained to extend its service life.

Rotary vane vacuum pump is a kind of vacuum equipment commonly used in laboratory and industrial production, which is mainly composed of parts such as motor, rotor and stator. This article will introduce how to use rotary vane vacuum pumps correctly.

1.Plug it in.

First of all, the rotary vane vacuum pump needs to be connected to the power supply. Before powering up, make sure that the power supply voltage matches the voltage on the device label and that the ground wire is connected.

2.Prepare the interface.

Before using a rotary vane vacuum pump, the interface needs to be prepared and the size of the interface needs to be matched to the equipment. The interface needs to be cleaned to ensure that there are no impurities or damage.

3.Start the device.

Before starting a rotary vane vacuum pump, it is necessary to ensure that the gap between the rotor and stator is lubricated. Once the device is started, you need to wait for a while until the device reaches its maximum operating speed.

4.Start vacuuming.

When the rotary vane vacuum pump has reached its maximum operating speed, it is ready to start vacuuming. During the evacuation process, Huai Digmin needs to ensure the tightness of the joints and pipes to prevent leakage. The speed of evacuation needs to be properly controlled to avoid damage to the pump.

5.Stop the device.

When it is time to stop a rotary vane vacuum pump, you need to close the inlet valve and wait for the equipment to stop. Before stopping the equipment, the lubricating oil needs to be cleaned to ensure that the equipment is dry and clean.

In conclusion, the correct use of rotary vane vacuum pumps can increase the efficiency and longevity of the equipment, while also ensuring the quality of experiments and production.

2) The vacuum level of the oil is reduced due to condensable vapor pollution, and the vacuum pump oil should be replaced with a new one.

4) The rubber parts of the intake pipe should be adjusted or replaced if they are not properly assembled, damaged or aged.

5) The oil hole is blocked, the vacuum degree is reduced, the oil can be discharged, the oil tank can be removed, the grease nozzle pressure plate is loosened, the grease nozzle is pulled out, the oil hole is dredged, and the parts are not wiped with the yarn head.

6) The vacuum system is seriously polluted, including containers, pipelines, etc., and should be cleaned.

7) The rotary vane spring is broken and should be renewed.

8) If the rotary vane, stator or bushing is worn, it should be inspected, trimmed or replaced.

9) The pump temperature is too high, which not only reduces the viscosity of the oil and increases the saturated vapor pressure, but also may cause the cracking of the pump oil. Ventilation and cooling should be improved to reduce the ambient temperature. If the temperature of the pumped gas is too high, it should be cooled before entering the pump, and the ambient temperature is high, so a better high-speed vacuum pump oil or 3 diffusion pump oil should be used as much as possible.

10) Due to the deformation, wear or movement of the parts, the maximum opening height of the check valve head is reduced or even cannot be opened, and the vacuum degree of the rotary vane vacuum pump is reduced due to too little oil intake, which should be adjusted, see the assembly part for details. If the opening is high, the oil inlet is more, but if the opening is too high, the check valve will not be able to fall automatically when it stops in some positions, and it will lose the effect of preventing oil return. The commonly used rotary vane vacuum pumps mainly include:

Two-stage rotary vane vacuum pump: Single-stage rotary vane vacuum pump.

Pro, the reasons why the dry rotary vane vacuum pump cannot reach the round vacuum value can be as follows: (1) Insufficient lubricating oil: If the lubricating oil in the pump is not enough or uneven, the potential capacity of the rotary vane vacuum pump will be affected, resulting in the final failure to reach the vacuum value.

2) Excessive suction of air: If the inlet pressure in the pump is too large, it will have a negative impact on the potential capacity of the rotary vane vacuum pump, resulting in the final failure to reach the vacuum value. (3) Poor exhaust:

If there is air resistance at the vent, it will limit the ability of the vacuum pump to achieve the final vacuum value, resulting in the final vacuum value not being reached. (4) The operation of the crankshaft is unstable: the rotation of the rotary vane vacuum pump is unstable, which will also limit the ability of the rotary vane vacuum pump to finally achieve the vacuum value, resulting in the final failure to reach the vacuum value.

Dear, we are glad to answer the reasons why the dry rotary vane vacuum pump cannot reach the required vacuum value may be in the following aspects:1Poor sealing of the pump body:

Dry rotary vane vacuum pumps need to maintain good sealing performance during operation, otherwise leaks will occur, resulting in a decrease in vacuum level. Poor pump body sealing can be caused by aging, wearing, or loosening of the seal. 2.

Rotor vane wear and dryness: The rotary vane of dry rotary vane vacuum pump is a component that is in direct contact with the gas, which will cause wear and tear after long-term operation, which will affect the vacuum level of the pump. When the rotary vane is severely worn, it needs to be replaced to restore the performance of the pump.

3.Gas regurgitation: During the operation of the dry rotary vane vacuum pump, if it encounters a medium containing a large amount of gas, it will lead to gas reflux, which will affect the vacuum degree of the pump.

At this time, the effect of gas reflux can be reduced by adding measures such as gas molecular sieves. 4.Pump Oil Contamination:

Dry rotary vane vacuum pumps do not need to be lubricated with oil, but in some cases, if the inside of the pump body is not cleaned in time during maintenance, oil may remain and affect the vacuum level of the pump. At this time, it is necessary to clean the inside of the pump body to completely remove the oil stain. In summary, the reason why the dry rotary vane vacuum pump cannot reach the required vacuum value may be caused by a variety of reasons such as poor or delayed sealing of the pump body, worn rotary vane, gas backflow or pump oil contamination, which need to be analyzed and treated on a case-by-case basis. 

Summary. Hello dear, glad to answer for you! The answer I have found for you is:

Generally speaking, when the pump temperature of the rotary vane vacuum pump increases, the viscosity of the pump oil will often decrease significantly, and the saturated vapor pressure of the pump oil will increase, so that the ultimate pressure of the pump will increase and the pumping efficiency will decrease; It is possible to directly affect the operation of the pump by making the rubber parts easy to age, so that the gap between thermal expansion and operation is narrowed, especially the thickness direction of some non-metallic rotary vanes inside the rotary vane vacuum pump and the gap between the inner holes of the copper sleeve. The reasons for the high pump temperature are usually the inlet air temperature is too high, the inlet air cooling device fails, the inlet pressure of the pump is too high for long-term continuous operation, the pump cooling water is insufficient, the circulating water design effect is not good, and the temperature control water control valve fails.

Hello dear, glad to answer for you! The answer I have found for you is: Generally speaking, when the pump temperature of the rotary vane vacuum pump rises, the viscosity of the pump oil will often drop significantly, and the saturated vapor pressure of the pump core oil will increase, so that the ultimate pressure of the pump will increase and the pumping efficiency will decrease; It is easy to age the rubber parts and narrow the gap for thermal expansion to operate, especially the thickness direction of some non-metallic rotary vanes inside the rotary vane vacuum pump and the gap between the inner holes of the copper sleeve, which can directly change the rock and affect the operation of the pump.

The reasons for the high pump temperature are usually the inlet air temperature is too high, the inlet air cooling device fails, the inlet pressure of the pump is too high for long-term continuous operation, the pump cooling water is insufficient, the circulating water design effect is not good, and the temperature control water control valve fails.

Now the circulating water can't be circulated, but the rotary vane is also broken, the pump is stuck, I want to know if the circulating water is not circulating and the pump body temperature is high, will cause the rotary vane to break.

Hello dear, glad to answer for you! The answer I got for you is: If the water temperature is too high, a large amount of vaporization will be carried out in the pump body, which will reduce the efficiency of the circulating water vacuum pump.

Therefore, the water temperature must be controlled, generally speaking, as long as the ambient temperature does not exceed the working environment requirements of the pump, there is no shortage of water. There will be no problems, it will be calculated at the time of manufacture. It depends on how high your temperature is and the design operating temperature of the pump, if your operating temperature is within 20 degrees higher than the design working temperature of the pump, there will generally be no problem.

Exceeding this range may result in reduced water flow in the pump base, increased power consumption, shorter bearing life, and even locking up of the pump due to overheating.

The oil is smoking, and the temperature is at least 80 degrees Celsius, which will cause the pump to freeze, right?

Hello Dear There is residual water in the pipe of the oil temperature machine or water in the composition of the heat transfer oil, which leads to the mixing of oil and water, and the water vaporization at high temperature causes the system pressure to be unstable. The system pressure is normal at room temperature, and when the temperature rises (above 80 degrees), the system pressure gauge shakes up and down, and the oil tank has a large amount of white smoke or heat conduction oil overflowing, and it can be buried to judge that there is water in the oil. During the heating process, as the water evaporates, a hot gas is generated, and when the water evaporates, this situation disappears.