First, the screw pump's starting screw pump has dry suction capacity, but must prevent dry rotation, so as not to scratch the working surface.
The screw pump should be started with the suction and discharge stop valve fully open to prevent overload or suction.
When the bypass valve is opened, the liquid circulates continuously in the pump under throttling, and the more the circulating oil, the longer the circulation time, the more serious the heat of the liquid, and even the pump Damage caused by high temperature deformation must be noted.
If the pump needs to be started at a low oil temperature or high viscosity, it should be started with the suction and discharge valves and the bypass valve fully open, so that the load at the start of the pump is the lowest until the prime mover reaches the rated speed. The bypass valve is gradually closed.
Second, the operation of the screw pump The screw pump must be operated in the specified direction to produce a certain suction and discharge.
When working on the pump, pay attention to check the pressure, temperature and mechanical shaft seal work. A slight amount of leakage should be allowed for the shaft seal. If the leakage does not exceed 20-30 seconds per drop, it is considered normal. If the pump produces noise during operation, it is often caused by too low oil temperature, too high viscosity of the oil, air entering the fluid, loss of the coupling, or excessive pump wear.
3. When the screw pump stops and stops, the discharge stop valve should be closed first, and the suction stop valve should be closed after the pump is completely stopped.
Due to the large length of the working screw and the poor rigidity, the screw pump is easy to cause bending and cause work failure. The connection to the shafting system must be well centered; the centering work is preferably carried out after installation and positioning, so as to avoid deformation caused by the pipeline; when connecting the pipelines, it should be independently fixed to minimize the impregnation of the pump. In addition, the spare screw is preferably suspended and fixed during storage to avoid deformation caused by uneven placement.
4. Important notes on the selection and configuration of the screw pump set and important instructions for using the boot:
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. If the pipeline is too thin, it will cause cavitation, which will make the pump work under the condition of not eating enough, resulting in the pressure drop of the three-screw pump set and even abnormal vibration and noise. The long-term operation will also cause serious damage to the 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.
This is some of the considerations for the use of screw pumps by Huangshan Aiken Machinery Manufacturing Co., Ltd. For more information about screw pumps, please visit http://kpslgb.cn.gongchang.com/news.html
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