1、 What kind of equipment is this: Three screw pump
2、 According to the title represented by the figure in the picture: 1. Pump rear cover; 2 Pump body; 3 Safety valve; 4 Bushing; 5. Automatic screw; 6. Driven screw; 7. Shaft sleeve; 8. Mechanical seal; 9. Bearing; 10. Pump foundation.

3、 Describe the operating principle of the equipment: Screw pump It is a screw positive displacement pump. In the three screw pump, because the spiral grooves on the main screw and the driven screw are meshed with each other and they are matched with the inner and outer surfaces of the three holes of the bushing, several stages of dynamic seal chambers can be formed between the inlet and outlet of the pump. These dynamic seal chambers will continuously move the liquid from the pump inlet to the pump outlet axially, and make the liquid transported step by step boost. Thus forming a continuous, stable and axially moving pressure liquid. Because of the mutual engagement of each screw and the close cooperation between the screw and the inner wall of the liner, one or more sealing spaces will be separated between the suction inlet and the discharge outlet of the pump. With the rolling and meshing of the screw, these sealing spaces are continuously formed at the suction end of the pump, sealing the liquid in the suction chamber, and moving continuously from the suction chamber along the axial direction of the screw to the discharge end, continuously discharging the liquid enclosed in each space, just like the scene of a nut being constantly pushed forward when the thread rotates, in which the number of thread turns is regarded as liquid, When the screw rotates, the thread rolling is equivalent to the scene of liquid in the screw pump, which is the basic operating principle of the screw pump. Three screw pump, IMO pump

4、 Explain the vulnerable parts of the equipment: mechanical seal, shaft sleeve and bearing.

5、 What is the effect of this equipment: it can be used to transport all kinds of non solid particles, non corrosive oils and smooth liquids.

6、 What problems should be paid attention to when maintaining the equipment:

1) The screw pump parts shall be carefully cleaned and checked during equipment, and the damaged parts shall be replaced;

2) When the transmission shaft is equipped with two universal joints, check whether the sealing ring is damaged and fill the cavity with smooth grease;

3) The bearings of the correct equipment make the shaft roll flexibly without jamming.

4) . Shaft seal equipment: when stuffing box equipment is used, make sure that the packing gland compression bolt is located in the shell equipment window to facilitate the wrench to adjust the bolt; 5) When tightening the exhaust body pressure, the nuts shall be tightened uniformly;

6) The mechanical seal equipment shall be careful, and the friction pair end face shall be clean and coated with smooth grease;

7) When the stator of the equipment is used, the surface of the inner cavity of the rotor and stator shall be coated with smooth oil, which is beneficial to the stator equipment;

8) When equipment is used, coupling equipment error: △ Y ≤ 0.2mm, △ α≤ 30’。

7、 What problems should be paid attention to in the operation of the equipment:

1) . Make sure that no sundries enter the pump body:
The solid sundries mixed in the wet sludge will damage the rubber raw material stator of the screw pump, so it is important to ensure that the sundries do not enter the pump chamber. Many sewage plants have installed a grinder in front of the pump, and some equipment grid equipment or filter screens prevent sundries from entering the screw pump. The grid should be removed in time to avoid blocking. 　　

2) Maintain constant outlet pressure:
The screw pump is a positive displacement rotary pump. When the outlet end is blocked, the pressure will gradually increase, so that it will exceed the predetermined pressure value. At this time, the motor load will increase sharply. The load of related parts of the transmission machinery will also exceed the design value, and in serious cases, the motor will be burned and the transmission parts will crack. In order to prevent the screw pump from being damaged, the overflow valve will generally be bypassed at the outlet of the three screw pump, It is used to stabilize the outlet pressure and maintain the normal operation of the pump. 　　

3) The three screw pump to prevent material interruption is never allowed to work under the scene of material interruption. Once it is produced, the rubber stator will burn out due to dry friction and instant high temperature. Therefore, the grinder is intact and the grid is unblocked, which is one of the necessary conditions for the normal operation of the screw pump. Therefore, some screw pumps also have the equipment for material interruption and shutdown on the pump body. When material interruption occurs, Because the screw pump has the characteristic of self-priming function, vacuum will be generated in the cavity, and the vacuum equipment will stop the screw pump. , IMO pump