When repairing a vacuum pump, what should I start with? 5

Precautions for the installation and use of vacuum pumps.

1.Choose a reasonable piping scheme.

1) The shorter the distance between the outlet of the vacuum system and the inlet of the pump, the better;

2) The fewer bends in the pipeline, the better;

3) The inlet pipeline should be higher than the inlet centerline of the pump, and the outlet pipe should avoid factors that cause greater resistance, such as the outlet pipe climbing, right-angle bending, etc.;

4) The diameter of the inlet and outlet pipe should be consistent with the diameter of the inlet and outlet of the product, if the vacuum system is small, the diameter of the inlet and outlet pipe can be small, but not less than 70 of the diameter of the inlet and outlet of the product, and the diameter of the outlet should be greater than or equal to the diameter of the inlet pipe;

5) The bend of the pipeline should be smoothly transitioned;

6) The inlet pipeline of the vacuum pump should be equipped with a valve, which is used to adjust the amount of water intake, and the amount of water inlet has an impact on the vacuum degree, and the valve can be controlled by observing the pointer of the vacuum gauge when adjusting the water intake, and the ultimate vacuum can be reached, in the working state, because the pipeline is not completely sealed, the vacuum degree can meet the work needs around the right and left.

2.When installing or repairing pipes, prevent foreign objects from falling in.

3.The joints of the pipeline should be gasketed, and there should be no air leakage or water leakage.

4.A vacuum gauge is installed at the suction port of the vacuum system to grasp the changes in the vacuum.

5.A valve is installed on the line of the suction port.

When the vacuum degree reaches the limit, it will produce a lot of noise, called cavitation sound, adjust the vacuum degree through the valve, when the vacuum degree is high, open the valve and release the appropriate amount of gas, and the cavitation sound disappears immediately. Close the valve when the vacuum level drops.

When repairing a vacuum pump, what should I start with? Pronotek said that the analysis was mainly from the vacuum pump oil filter, vacuum pump oil, vacuum pump blades and vacuum pump seal kit.

1. Vacuum pump oil filter, this is one of the accessories that are often replaced by vacuum pumps.

2. Vacuum pump oil, vacuum pump oil is particularly important for vacuum pumps.

3. Vacuum pump blades.

4. Vacuum pump sealing kit.

There may be several reasons why the flow rate of the vacuum pump is not enough:

1.Blocked inlet or outlet of the pump: This may be due to impurities or sediment in the pipes, requiring cleaning of the pipes or replacement of filters.

2.Damage to the impeller or blades of the pump: The impeller or blades may be caused by long-term use or improper operation of the first carry, and the impeller or blades need to be replaced.

3.Poor seal of the pump: It may be caused by aging or damaged seals that need to be replaced.

4.Motor failure of the pump: It may be caused by motor damage or power supply issues, and the motor or power supply needs to be checked.

5.Insufficient vacuum of the pump: This may be caused by the pump not being vacuum high enough and a higher performance pump needs to be replaced.

The above are the common causes of insufficient flow of vacuum pumps, which need to be troubled and repaired according to the specific situation.

In the maintenance of vacuum pumps, there are two reasons for the lack of vacuum pump flow.

Pipeline leakage and leakage; The drag loss increases.

The insufficient power supply of the motor leads to insufficient speed; inadequate water supply; The gap between the impeller and the distribution plate is too large; Leakage of water and air due to broken mechanical seals; Excessive impeller wear; Circulating water cannot be discharged. (Pronock finishing).

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. 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.

<> precautions for the use of vacuum pump oil:

The shelf life of the oil for vacuum equipment can reach three years under sealed conditions;

The oil should be stored in a cool and dry place;

After the oil drum is opened for use, the remaining oil should be sealed with a sealed cap. At the same time, use up the remaining part as soon as possible, and do not mix with other powder and liquid impurities;

Environmental tools should be kept clean, and should be dried after cleaning with solvents;

According to the structural accuracy and use environment of the vacuum pump, the oil with corresponding precision and quality should be selected.

Precautions for choosing a vacuum pump:

1. Whether the vibration generated by the vacuum pump has any impact on the process and the environment. If the process does not allow it, a non-vibrating pump should be selected or anti-vibration measures should be taken. 2. Understand the composition of the pumped gas, whether the gas contains condensable vapor, whether there is particle dust, whether it is corrosive, etc.

When choosing a vacuum pump, you need to know the gas composition and select the appropriate pump for the gas being pumped. If the gas contains vapors, particles, and corrosive gases, auxiliary equipment, such as condensers, dust collectors, etc., should be considered on the pump inlet pipeline. 3. Under its working pressure, the vacuum pump should be able to discharge all the gas generated during the process of vacuum equipment.

4. Correctly combine the vacuum pumps. Because the vacuum pump has selective pumping, therefore, sometimes the selection of a pump can not meet the pumping requirements, and several pumps need to be combined to complement each other to meet the pumping requirements. For example, the titanium sublimation pump has a high pumping speed for hydrogen, but cannot pump helium, and the three-pole sputtering ion pump, (or the two-pole asymmetric cathode sputtering ion pump) has a certain pumping speed for argon.

In addition, some vacuum pumps cannot work at atmospheric pressure and need to be pre-vacuumed; Some vacuum pump outlet pressure is lower than atmospheric pressure, and a backing pump is required, so the pumps need to be combined. 5. The requirements of vacuum equipment for oil pollution. If the equipment is strictly required to be oil-free, you should choose a variety of oil-free pumps, such as:

Water ring pump, molecular sieve adsorption pump, sputtering separation ballast spike pump, cryogenic pump, etc. If the requirements are not strict, you can choose to have an oil pump, plus some anti-oil pollution measures, such as cooling traps, baffles, oil traps, etc., can also meet the requirements of clean vacuum.

<> FFG-244 flexible plate-making color printing line produced by Emba Company in Sweden adopts vacuum adsorption feeding, so the vacuum pump is the key equipment of the assembly line, and there are two typical failures in use.

1.The noise is high, and the gauge shows that the vacuum pressure is very low.

The vacuum pump is noisy, the instrument shows that the vacuum pressure is very low, below 1kpa, the feed part is seriously misplaced, and the scrap rate is too high. Adjusting the vacuum plate and vacuum valve had no effect, and I contacted the Swedish manufacturer and could not solve it. The index test of the vacuum pump found that the dynamic unbalance was 28 40g, and the information was checked, and about 30g should not have much impact.

After the pump is disassembled and disassembled, and the impeller is dynamically balanced, the unbalance is there, the test machine is installed, the noise is gone, and the feeding is normal. After the analysis, this fault was caused by the failure of the filter, waste and paper scraps entered the impeller, which destroyed the balance of the impeller, resulting in the overall vibration and noise of the vacuum pump, and the misalignment of the feed part.

2.The vacuum pump impeller was blown into three pieces.

When the equipment is running, the pressure gauge swings loudly and the sound is loud, and then I hear a sound like **, most of the vacuum pump is blown up, and the impeller is blown into three pieces, and half of the shell is also broken, which is basically scrapped (the cause of the problem is still under further investigation).

Mapping impeller, remade with ballast spike. The original impeller material is aluminum alloy, but there is no label Gen Peibu decided to use ZAL215-217 sand turning according to experience, after 12 days of processing and installation, the effect is good after commissioning and operation.

The significance of solving this accident lies in the fact that there are 26 same assembly lines in China, and a vacuum pump needs about 300,000 yuan, and the benefits of solving it themselves are significant.

After the connection of each equipment is completed, it is necessary to open the switches or valves of each equipment in the required order according to the operation specifications, and then start the vacuum operation of the air conditioner pipeline system. In actual operation, you can refer to the following 6 steps: 1. First, use a live wrench to open the control valve of the three-way globe valve to make it in the three-way state.

2. Similarly, open the two-way stop valve on the outdoor unit to make it in a two-way state. 3. Open the valve of the three-way pressure gauge and make it in the three-way state. 4. Press the power switch of the vacuum pump to start vacuuming.

5. When the vacuum pump runs for more than 20min, or when the pressure gauge on the three-way pressure gauge valve displays the value, it meets the vacuum requirements. 6. After the vacuum is completed, first close the three-way pressure gauge valve, and then turn off the power supply of the vacuum pump. In the actual operation of vacuuming, before turning on the power supply of the vacuum pump, the whole pipeline system of the air conditioner should be ensured to be a closed circuit; The control chain of the two-way globe valve and the three-way globe valve should be opened, and the three-way pressure gauge valve should also be in the three-way state.

1. The principle of careful balance of the working limb is mainly to use the left screw and the right screw of the gear transmission synchronous reverse rotation without contact with each other to rotate at high speed, and use the pump casing and the propeller screw groove that meshes with each other to divide into multiple spaces and form multiple stages, and the gas is transmitted in each groove in equal terms, without compression, and only the spiral structure at the end of the screw has a compression effect on the gas.

2. The pressure ladder can be formed between the various levels of the screw to disperse the pressure difference and improve the compression ratio, and the gap between the parts and the pump speed have a great impact on the performance of the pump. When designing the clearance of each part of the screw, it is necessary to consider the expansion, processing and assembly accuracy, and working environment. Dry screw vacuum pumps, like roots vacuum pumps, do not have an exhaust valve.

When using a vacuum pump, you don't pay attention to maintenance, which makes the vacuum pump easy to age and wear. In fact, in the machinery industry, the more machinery needs to be well maintained, here, sort out some vacuum pump maintenance knowledge, vain can be useful to everyone.

1.Check whether there is loosening in the vacuum pump pipeline and joints. Turn the vacuum pump by hand to see if the vacuum pump is flexible.

2.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.

3.Unscrew the water diversion plug of the vacuum pump body, and pour the water or slurry.

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.Start the motor, when the vacuum pump is running normally, open the outlet pressure gauge and the inlet vacuum pump, and gradually open the gate valve after it shows the appropriate pressure, and check the motor load at the same time.

7.Try to control the flow and head of the vacuum pump within the range indicated on the signage to ensure that the vacuum pump operates at the highest efficiency point, so as to obtain the maximum energy saving effect.

8.During the operation of the vacuum pump, the bearing temperature should not exceed the ambient temperature of 35, and the maximum temperature should not exceed 80.

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

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

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

12.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 droplets.

13.Regularly check the wear of the shaft sleeve, and replace it in time after the wear is large.

14.When the vacuum pump is used in the cold winter season, after stopping, the lower part of the pump body needs to be unscrewed to discharge the medium. Prevents freeze cracking.

15.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.