2XZ rotary vane vacuum pump is a common mechanical vacuum pump, widely used in laboratories, the chemical industry, food processing, and other fields. To ensure the long-term stable operation of the 2XZ rotary vane vacuum pump, it needs regular maintenance and repair. Maintenance and troubleshooting of the vacuum pump is the key to ensuring its long-term stable operation. Regularly checking the oil level and replacing the vacuum pump oil, cleaning the air filter, and checking the pump body seal and rotary vane wear are the basic maintenance work, that can effectively prevent the pump body from overheating, poor pumping effect or leakage. At the same time, it is necessary to avoid overload operation and keep proper load and working time. For common failures, such as poor pumping effect, pump body overheating or unable to start, etc., timely check the oil quality, clean the exhaust port, check the motor and the electrical system, make sure the seals are intact, and eliminate the internal clogging, you can quickly troubleshoot the problem. These regular maintenance and timely troubleshooting measures, not only can extend the service life of the vacuum pump, but also improve its working efficiency.
Tips for 2XZ Rotary Vane Vacuum Pump Maintenance
The following are some common maintenance tips:
- Cleanliness: Keep the pump clean to prevent contaminants from entering the pump.
- Filter: A filter is recommended. Monitor and replace the filter regularly to prevent solids and liquids from entering the pump. The upper and lower connections of the filter are spaced about 3/5 of the overall filter height. When there is too much water solution, it can be drained through the drain screw plug and tightened promptly.
- Pay attention to the oil cleaning: If the pump oil becomes dirty, turbid, or contains water or other volatile substances, it will affect the ultimate vacuum. You can open the gas ballast valve to purify it at this time. Observe the ultimate vacuum recovery. If the ultimate vacuum is not recovered after several hours, the pump oil should be replaced.
- Replacement of pump oil method: The pump runs for about half an hour, making the oil thin. Stop the pump from the oil drain hole to drain the oil, and then open the air inlet to run for 10-20 seconds. During this time, you can slowly add a small amount of clean pump oil from the suction port to replace the oil in the pump chamber memory. If the oil coming out is dirty, the latter can be repeated.
- Maintain oil level: Check the oil level when the pump is running. It should be maintained in the middle of the sight glass.
- Oil: Change the oil regularly to prevent contamination, which can cause performance problems and pump failure. It is recommended that the oil be changed every 100 hours of operation or every six months to a year.
- Oil quality: Avoid mixing diesel fuel, gasoline, or other oils with high saturated vapor pressures with vacuum oil as this may reduce the ultimate vacuum.
- Vanes: Vanes should be replaced when they are one-fourth shorter than new. When replacing the vanes, the bearings and gaskets should also be replaced.
- Oil loss: Use a crude oil separator in the discharge line to minimize oil loss.
- Backup pump: Keep a spare pump on hand to minimize downtime.
- Storage: If improper storage causes moisture or other volatiles to enter the pump chamber, open the gas ballast valve to purge. If the ultimate vacuum is affected, consider changing the oil.
- Installation: Install the pump in a clean, dry, and ventilated area.
- Periodic inspection and maintenance: Periodically check the pump’s ultimate pressure and calibrate using a compression mercury vacuum gauge. Check that the pump steers properly and sounds normal.
- Cleaning and overhaul: If the pump needs to be disassembled for cleaning or overhauling, attention must be paid to the disassembly steps to avoid damaging the parts. When disassembling and cleaning the parts inside the 2XZ rotary vane vacuum pump, it is generally OK to wipe them with gauze. If there are metal chips, sand, mud or other harmful substances to be cleaned, gasoline can be used for scrubbing and drying before assembling, do not use gasoline to soak.
How to install a 2XZ rotary vane vacuum pump?
The steps for installing a 2XZ rotary vane vacuum pump are as follows
- Wipe the parts with gauze to prevent the return wire from blocking the oil holes, it is best to use cleaning fluid and brush cleaning.
- the rotor blade into the rotor groove, the senior rotor into the stator that spring body, the installation of L high-level pump cover, pins, screws, keys, couplings, rotating by hand, there should be no leakage of obstruction and the obvious weight, should be installed so that the top of the stator face down, to gravity to make the rotor close to the stator arc surface, the best in the 0.0lmm gap.
- Low-level rotor assembly method as above.
- 2XZ type rotary vane vacuum pump check valve impeller and other check parts, should make the check valve head plane aligned with the oil inlet nozzle oil holes, according to the work of the steering rotor and gently reverse hand blocking the impeller, the oil holes should be open and closed, adjust the valve head plane maximum opening height of O.8 ~ 1.2 mm, specifically can move the check valve seat, rubber check valve head in the valve stem hole position to achieve. Simple check method: face the impeller, make Φ3mm drive pin in the right-hand horizontal position, clockwise direction toggle the impeller, at this time the opening height of the check valve head plane is close to the maximum, it should be 0.8 ~ 1.2mm. rotor stops in any position, the hand from the impeller after the release of the check valve head should automatically fall off to close the oil holes.
- Install 2XZ type rotary vane vacuum pump exhaust valve, oil baffle plate, and other parts.
- Install the pump part, key, coupling, and motor on the support.
- Install the oil tank.
- Insert the air inlet nozzle, gas ballast valve, and mounted flange fastening.
Note
- Assembly 2XZ type rotary vane vacuum pump friction surface coated with clean vacuum pump oil.
- Remember the parts of the original assembly position, can reduce the time to run together.
- Fasteners should be no looseness.
How to disassemble a 2XZ rotary vane vacuum pump?
The disassembly steps of a 2XZ type rotary vane vacuum pump are briefly described as follows
- Drain the oil
- Loosen the air inlet nozzle flange screw, pull out the air inlet nozzle, loosen the gas ballast valve flange screw, and pull out the gas ballast valve.
- Remove the oil tank of the 2XZ rotary vane vacuum pump.
- Remove the cotter pin and the impeller of the check valve.
- Remove the support and pump connection screws, and remove the 2XZ rotary vane vacuum pump assembly, and motor removal depending on convenience.
- Loosen the pump cover screws, remove the pump cover, and pull out the two rotors and rotary vane. When removing the low-level rotor, remove the cotter pin first.
2XZ Rotary Vane Vacuum Pump Troubleshooting Tips
2XZ rotary vane vacuum pump in the use of the process may appear a variety of faults, common faults and troubleshooting methods are as follows
| Faults | Solutions |
| The ultimate vacuum is not high | 1. Less oil is stored in the oil tank and the oil level is too low to act as an oil seal for the exhaust valve, and there is a big exhaust sound. Add clean vacuum pump oil to oil mark ZX. 2. The pump oil is contaminated by condensable vapors and the vacuum degree decreases. Can open the town to purify or replace the new oil. 3. The pump port external piping, container, test instrument piping, joints, and other leakage. Big leakage, there is a big exhaust sound, and an exhaust port with gas discharge, should find out the leakage parts, to eliminate. 4. The inlet nozzle or gas ballast valve rubber seal assembly is improper, damaged, or aging, and should be adjusted or changed. 5. The air inlet nozzle is free of blockage, and the vacuum degree decreases. Can first drain the oil, remove the oil tank, loosen the nozzle pressure plate, pull out the inlet nozzle, and dredge the oil hole. 6. The vacuum system that is seriously polluted, including containers, pipelines, etc., should be pre-cleaned. 7. The rotary disc spring is dismantled. Pre-swap the spring. 8. The rotary vane, pump body, or copper lining is worn, and the clearance is too large. Should be checked, trimmed, or replaced. 9. The pump temperature is too high, which not only makes the oil viscosity drop, and saturated vapor pressure increase but may also cause the pump oil to crack. Should be changed to ordinary gas cooling. If the pumping temperature is too high, it should be pre-cooled before entering the pump. |
| Oil spraying | 1. Excessive oil in the pump memory, the oil level is too high. Excess oil can be released. 2. Mist reducer in the pump oil or debris. Should be checked or cleaned up. 3. Whether the position of the oil plate is correct and firm. |
| Oil leakage | 1. Check whether the oil drain screw plug and oil tank gasket are damaged or improperly assembled and whether it is pressed flat; whether the screw is tightened. 2. Whether the oil label is tightened, or whether the plexiglass is overheated and deformed. If any of the above conditions, it should be pre-adjusted or replaced. 3. The connecting gasket between pump body parts and support is not well padded; the screw is not tightened, it should be checked and adjusted. 4. Improper oil seal device or wear, can be replaced. |
| Noise | 1. The rotary spring is broken. The spring can be replaced. 2. Burrs, dirt or deformation, running to obstacles. Should be checked and cleaned. 3. Bearing wear, parts wear, should be repaired or replaced. 4. The motor out of trouble, should be checked. |
| Oil return | 1. Check valve is closed, stop the pump, and the oil level drops quickly. Can open and stop again, observe the changes, or disassemble and check. 2. Two pump cover oil seal assemblies or wear, can be replaced. 3. The pump cover or pump body plane is not flat and can be trimmed. 4. The exhaust valve piece is damaged and should be replaced. |
By finding and eliminating these faults in time, the normal operation of the 2XZ rotary vane vacuum pump can be ensured, the service life can be extended and the working efficiency can be improved. If the problem is complicated, it is recommended to contact professional technicians for inspection and repair.
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