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Assembly method of mechanical seal for screw pump and three screw pump

Update:09-06-2020
Summary:

The assembly method of mechanical seal of screw pump an […]

The assembly method of mechanical seal of screw pump and three screw pump is very important. The correct assembly method can ensure that the seal of screw pump and three screw pump will not leak. The specific installation and use methods are as follows:
1. Check whether the model and specification of the mechanical seal for screw pump and three screw pump are correct.
2. Check whether the dimensional accuracy, geometric accuracy and interrelation of the parts related to the installation of screw pump and mechanical seal meet the technical requirements. There are mainly the following aspects:
(1) Radial runout tolerance of shaft (or sleeve) at the installation position of mechanical seal, surface finish and outer diameter dimension tolerance of shaft (or sleeve).
(2) The perpendicularity tolerance of the sealing cavity and gland joint positioning end face to the shaft (or shaft sleeve) centerline.
(3) Install the end of the shaft (or sleeve) of the moving ring seal ring, and the chamfer and finish of the end structure of the housing hole of the mechanical seal.
(4) The axial displacement of the rotating shaft of the mechanical seal when it works.
3. During the installation of mechanical seals for screw pumps, they shall be kept clean and shall not be knocked with tools to prevent damage and damage.
4. When the mechanical seal of screw pump is installed, the surface of dynamic and static rings shall be coated with a layer of clean engine oil and turbine oil. Before the installation of the auxiliary seal ring (including the moving ring seal ring and the static ring seal ring), a layer of clean oil or turbine oil shall also be applied to ensure the smooth installation.
5. Put the static ring seal ring behind the back of the static ring into the seal end cover, pay attention not to damage the end face of the static ring, ensure that the end face of the static ring is perpendicular to the center line of the end cover, and pay attention to that the anti rotation groove on the back of the static ring is aligned with the anti rotation pin, but cannot contact with each other.
6. The rotating part of the mechanical seal of screw pump is fixed with the shaft by two fixing screws on the spring seat. When tightening the fixing screws, the working length of the spring shall be ensured.

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