Precautions for installation and disassembly of the screw pump
1. The screw pump parts should be carefully cleaned and inspected during assembly, and the damaged parts should be replaced;
2. When assembling the 20,000-way joint of the drive shaft, check whether the seal ring is damaged or not, and fill the cavity with grease;
3. The correctly installed bearing makes the shaft rotate flexibly and without jamming.
4. Shaft seal installation: When installing the stuffing box, the packing gland pressing bolt should be placed in the housing installation window to facilitate the wrench to adjust the bolt;
5, the timing of the discharge body pressure tightening, the nut tightening should be uniform;
6. Mechanical seal installation should be careful, the end face of the friction pair should be cleaned and coated with grease;
7. When installing the stator, apply lubricant to the surface of the rotor and stator cavity to facilitate stator installation;
8. When installing and assembling, the coupling installation deviation: △Y≤0.2mm, △α≤30'.
Second, the screw pump removal steps:
1. The screw pump is separated from the motor and the medium is drained (to prevent the motor and toxic medium from injuring);
2. Disassemble the screw pump discharge body;
3. Disassemble the screw pump stator, if necessary, according to the pump shaft steering shaft to assist;
4. Disassemble the rotor and the intermediate shaft;
5. Disassemble the drive shaft and shaft seal;
7. For long-term unused screw pumps, anti-rust treatment is required. The method is to apply non-painted metal surface with anti-rust grease, including shaft surface, packing shell inner cavity, etc., and lubricate.
Third, on the screw pump set selection configuration instructions and important instructions for using the boot precautions:
1. It is strictly forbidden to idling without medium. Be sure to add lubricity medium or conveying medium before starting the driving.
2. It is strictly forbidden to enter all the welding slag of the sundries into the pump cavity, and it is necessary to keep the cleanliness inside the pump cavity and the pipe.
3. It is strictly forbidden to use the pipeline filter or Y-type filter device. To configure the filter, please ensure that the filtration area is 20-40 times the cross-sectional area of ​​the pump inlet diameter. The mesh number of the filter is correctly configured according to the cleanliness of the media.
4. It is strictly forbidden that the inlet and outlet pipes of the pump do not match the inlet and outlet pipes of the pump. The pipe diameter configuration must be consistent with the inlet and outlet of the pump. To avoid cavitation or self-priming. Too thin a pipe must cause cavitation, which will cause the pump to work under insufficient conditions, resulting in a drop in the flow pressure of the three-screw pump set or even abnormal vibration and noise. Long-term operation will cause serious damage to the card pump and the screw pump.
5. The installation height of the three-screw pump must fully consider the cavitation condition of the pump and the self-priming capacity of the pump (the NPSH is related to the viscosity of the medium and the lead of the screw)
6. Due to the lifting and unloading of the packaging and transportation and the tightening of the pipeline bolts, the original factory positioning of the pump may be changed or even seriously misplaced. Therefore, after the installation and installation of the three-screw pump unit piping system is completed, it is necessary to re-check the three before starting the driving. The coaxiality of the screw pump and the motor.
7. It is strictly forbidden to start the machine when the back pressure is started and the inlet and outlet valves are closed.
8. It is strictly forbidden to start the rotation in the direction that does not meet the pump rotation mark.
9. The double pump must be connected in parallel with the check valve at the outlet and inlet of the pump to prevent the reverse flow of the medium to drive the three-screw pump reverse.
10. It is strictly forbidden to adjust the safety valve bolts at will. The safety valve is only used to protect the safety of the pump and the matching of the motor power and the working state of the pump. It is strictly prohibited to be used as a pressure regulating valve and a relief valve.
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