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2, in order to prevent fuel injection due to return and reverse, you should open the pump port, according to the provisions of the steering wheel pump memory oil to the tank. At the same time check the oil level should be above the oil standard center, but not full of oil standard, more to be released.
3, determine the steering method of assistance. Pour the sheath on the pump port, such as after the pump is sucked, is the positive, was blown off, is the reverse. Normal sound is positive, abnormal sound is reversed.
4, as in the pump port equipped with inflatable solenoid valve, the general should be cross-loaded, and with the pump at the same time action.
5, the relative humidity is high or gas to be pumping gas condensable steam containing water vapor, the gas valve should be used.
6, according to the instructions recommended vacuum pump oil. Note Ester vacuum pump oil can not be mixed with mineral oil type vacuum pump oil and other oils, must be strictly cleaned before changing into the ester vacuum pump oil.
7, check the ultimate pressure of the pump to compression mercury vacuum gauge shall prevail. Total manometers should be carefully calibrated and calibrated against reserve and alignment. It is advisable to install a ball valve between the regulator and the pump under test. Off valve when not in use, can extend the regulation of the use of time.
Second, rotary vane vacuum pump maintenance 1, we must first understand the type of pump, characteristics, the current situation. Understand the requirements, determine the repair target. Before testing, prepare for testing.
2, to determine the fault, diagnosed fault. Judgment, may save trouble. Confirmed to verify.
3, troubleshooting, first Jane after the complex, the first easy hard. Do not disassemble without demolition. To reduce the lack of special tools and improper operation caused by new damage, reduce the position changes and run-in time. In general, the splicing rotor is not removable, otherwise the form of tolerance can not be guaranteed, the rotor scrapped.
4, toxic and harmful, corrosive pumps, users should be invited to clean, customs informed the necessary protective measures to protect the health of maintenance personnel.
5, fault classification:
It is recommended to divide the faults into operational faults and performance faults.
Operation failure can include pump does not turn, the pump temperature is too high, oil spills, water leakage, the maximum power exceeded.
Performance failure can include the ultimate pressure, extreme pressure, suction efficiency, noise, fuel injection, gas town performance, etc. can not meet the requirements or not.
Third, failure to determine and diagnosis Example 1, the pump does not turn. Unknown circumstances can not be opened pump, so as not to aggravate the fault. Can be used to move hands and can not move.
A, the pump can move without rotation. The reason can be coupling failure; belt slippage; motor wiring is wrong; motor damage; no power and so on.
B, can not be disc or disk is very heavy, the reason can be because the starting pump temperature is too low, the pump oil viscosity is too high; design and manufacture of pump stop to return too much. Too much oil caused by the pump back to the oil too much (too much fuel, or water vapor condensation in the pump, or condensate in the exhaust pipe back to the pump); foreign matter in the pump (intake manifold welding Slag, oxide; Rotor spring pump parts such as debris); Rotary deformation stuck; occurred occlusion (copper sleeve, rotor, the wall, pump cover, stator, bearings).
2, the pump temperature is too high. Refers to the lowest measured near the exhaust valve exceeds the maximum oil temperature specified in the manual. As the pump temperature will cause a substantial decline in the viscosity of the pump oil, and right to use the saturated vapor pressure pump oil increased pressure to pump the ultimate pressure and suction efficiency decreased; rubber parts easy to aging; thermal expansion of the operation of the reliability . Pump temperature is too high because the pump ambient temperature is too high, the intake air temperature is too high, the intake air cooling device fails, the pump long-term continuous operation into the pressure is too high; water cooling pump insufficient cooling water circulation design is not effective; Water control valve failure and so on.
3, oil spill. Can occur in the shaft seal, the sealing surface of the fuel tank and pump parts, drain plugs, oil standard, hole stuffy head, stator parts and bearing through-hole connections, gas ballast valve (for example, 2X-8) and other parts. Aging by the seal, improper installation, damage failure, the surface is not flat, there are impurities, rough and loose casting caused. If you stop the pump back to the oil, the oil will enter the gas town valve, the gas valve may not leak gas.
Homemade rubber mat, be sure to use oil rubber, according to the original design shape, sealing surface is too large when the pressure will leak.
4, leaking. Can occur in the water pipe head, water jacket boring cover plane, drain hole plug, drain valve, etc., water jacket drill wear, casting defects, cracking, may also lead to water leakage.
5, the maximum power exceeded. Continuous long-term work by the inlet pressure is too high, the exhaust pressure is too high, debris into the occlusion occurs, the pump temperature is too high, the rotary vane with the gap is too small, the voltage is too high, too much pump back into the pump caused by the will Damage to the motor. Should try to avoid long-term continuous operation near the maximum power. If there is sediment on the surface, remove it regularly.
6, the ultimate pressure but the standard. Can be caused by external leakage, internal leakage, oil hole blockage, poor quality or pollution of pump oil, water vapor, etc. until the condensable material, instrument distortion, pump operation is not normal and so on.
More leakage, the exhaust can see the white steam. There are more bubbles at the oil mark, hand feeling exhaust pressure on the exhaust port. Low-level exhaust valve at the surface there are more bubbles. Power will increase. At this time, first check whether the gas ballast valve is closed. As the new pump factory in the pump each port to measure the ultimate pressure, so if the leakage phenomenon, the pump port and piping, valves, containers one by one inspection. Outer shaft seal failure, oil cup oil-free, gas-filled head can also cause leakage. Internal leakage can be the pump movement gap, exhaust valve and other planes, the exhaust valve sealing surface, the shaft seal, pump cover plane, intake pipe, gas valve seals and other wear and tear, corrosion, bite will make running clearance plus Big. When the oil hole is blocked, open the oil hole to hear the noise of the pump will be lighter. If the oil seal is good, the exhaust valve may fail if the hand is sucked on the exhaust port.
If the pump oil clean, unused long-term storage, open the town valve to purify the water vapor pump. If invalid, check the meter. If the pump oil yellow and white has emulsified, the gas can be fully open the town, adjust the atmosphere to purify the operation, if necessary, the amount of gas into the pump port operation, can speed up the purification process. If other volatile gases or liquids are pumped, please change the oil in time and wash the oil tank if necessary. Some pumps, in the interstital airway will be deposited pump fluid, in order to obtain a good oil change effect, to find ways to drain the pump fluid.
The ultimate pressure is measured using a seat compression mercury vacuum gauge. Measured values ​​increase with a full pressure gauge such as a calibrated thermocouple gauge. Note the regulation of the thermocouple gauge to be paired. It is advisable to back up a calibration that is calibrated at the same time for comparison against any suspected contamination regulation.
Increasing the ultimate pressure will decrease the pumping efficiency during high vacuum and will also raise the ultimate total pressure. Can refer to the above description to determine, check, deal with the decline in pumping efficiency and the ultimate pressure rise of the failure.
7, noise. Pump structure design, the motor and pump bearing noise, rotating pieces and other moving parts are smooth, too much oil into the fan, the noise generated by the transmission, a large intake, open air town operation, the oil pan and other pumps Loose parts, inequitable installation caused by vibration, will affect the pump noise.
8, fuel injection. To prevent the injection of fuel tank back to the oil hole size, location, sealing condition, oil retaining plate design, installation, exhaust port part of the mist reducer, oil cap, oil and gas separator, the level of oil into the oil The size of the volume will affect the pump fuel injection, open the oil pump air inlet, direct pump exhaust air flow rate can be as high as 30M / S, open the oil surface, the pump circulating oil and air out of the oil Will test the measures to prevent fuel injection.
Fourth, the other, some pump pumps, oil separator, there is a one-way valve on the oil road, a mist eliminator, an inlet filter (anti-oil steam backflow), a filter inlet and other parts or accessories, Also check. Pump failure will pump lubrication and seal failure, mist eliminator failure, may make the exhaust pressure increases, the power increases, damage to the motor, inlet filtration failure can increase the intake resistance, pumping speed, pumping efficiency decline.
Five, cleaning. Do not dipping, so as to avoid the lotion into the splicing rotor inside, not easy to discharge.
Six, disassembly. In accordance with the instructions for use and orderly manner, remember the location, reasonable display, so as not to mistake installed.
Rotary vacuum pump principle, structure, use and maintenance
Manual, check the shipping quality after unpacking. Receive good Spare Parts and technical documents, remove the exhaust guards. Install as required, wiring, test turn. Water Ling pump water.