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After using the Roots vacuum pump for a period of time, some failures will occur. We must pay attention to check whether the bearings, oil seals, machine seals, belts, etc. are damaged during maintenance. If they are damaged, they must be replaced in time, and the installation of Roots pumps must be done.
1. Disassembly and cleaning
The first step is to remove the V-belt, the inlet and outlet pipes of the pump, the heat tracing steam line, and the nitrogen line; remove the anchor bolts and move the vacuum pump to the inspection platform;
The second step is to open the cover plates at the top of the pump and use a feeler gauge to insert a person from the upper cover to measure the back and forth gaps between the rotor and the partitions at all levels and make a record;
Finally, use a marker pen over the entire plane of the vacuum pump to make clear marks to avoid errors during recovery; mark the front and rear positions of the driving rotor and driven rotor; remove the pump body connection bolts of the vacuum pump, and gradually remove from the tail end at the same time Measure and record the thickness of the paper pad between each level of separator until it is completely disintegrated. Clean all parts of the vacuum pump with alcohol. The fouled part can be cleaned with gauze paper. The brushed part of the rotor wall plate and the partition is flattened with a file, and polished by a polishing machine.
2. Installation steps
Prepare new rotors, rolling bearings, oil seals, mechanical seals, and paper pads that need to be replaced; replace the oil seals on the front and rear bearing box wall plates for backup.
(1) Fix the maintenance platform with a rectangular frame, put the front partition of the first-stage rotor on it, place the driving and driven rotors according to the marks, and install the pump casing, partition, inter-stage sealing ring, and adjustment paper pads step by step. As well as the cylindrical positioning pins at the four corners, pay attention to the adjustment of the thickness of the paper pad and the record during disassembly, and tighten the pump body fastening bolts.
(2) The pump body is placed on the maintenance platform, and the throttle ring of the rotor at the two partitions is installed; the inner wall plate of the bearing box is installed; the bearing seat and the bearing are installed.
(3) Use a feeler gauge to check the front and rear clearances of the rotors and partitions at all levels. They are required to meet the clearance data of the maintenance manual of the vacuum pump. Generally, the clearance between the rotors and the front and rear partitions is required to be greater than the required minimum. The adjustment range is 0 ~ + 0.10mm.
(4) Pre-installed synchronizing gear: Install the synchronizing gear with the keyway locked, and the conical synchronizing gear can be lightly pressed by hand first.
(5) The angle of the two rotors is adjusted to cross 90 °. Use a feeler gauge to insert the rotor between the two rotors in the second stage, and fix the rotor with the long axis vertical. Turn the other rotor gently by hand. The tight nut is tightened on the conical synchronous gear; there should be no jamming by manual turning.
(6) Use a feeler gauge to check the gaps between the rotors at all levels, and check at the position where the two rotors are at ± 45 ° to the horizontal line; D is the total gap between the two rotors. Generally, the rotor is D / 3 at -45 °. The gap is 2D / 3 at + 45 °.
(7) Install the front cover of the front and rear bearing boxes, oil seals, and mechanical seals, install the rear cooling water tank, and install the pulleys;
(8) Install the roots vacuum pump back to the original equipment foundation, tighten the anchor bolts, adjust the tightness of the triangular belt, and restore the inlet and outlet pipe connections.
(9) Lubricate, check the seal, and prepare for test run.
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