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How to properly install a single mechanical seal

by:Lepu Seal     2022-01-22

How to correctly install the single-end mechanical seal The installation sequence of the mechanical seal, after the installation preparations are completed, the installation can be carried out in a certain order to complete the installation of the stationary parts in the end cover and the installation of the rotating parts on the shaft, Finally complete the overall combined installation of the seal. Taking the unbalanced mechanical seal with built-in single end face for centrifugal pump shown in Figure 1 as an example, the installation sequence is described as follows:
1. Installation of static parts Insert the anti-rotation pin (1) into the corresponding hole of the sealing end cover, and then insert the auxiliary sealing ring of the static ring
(2) Insert it from the end of the static ring (3). If a V-ring is used, pay attention to its installation direction. If it is an O-ring, do not roll it. Then, align the anti-rotation pin groove on the back of the stationary ring with the anti-rotation pin and install it into the sealing end cap. The height of the anti-rotation pin should be appropriate, and a gap of 1~2mm should be reserved with the static ring, and the static ring should not be placed on top. Finally, measure the distance A from the end face of the static ring to the end face of the sealing end cap. After the static ring is installed in the end cover, check the verticality of the sealing end face and the center line of the end cover and the flatness of the sealing end face. For pumps that transport liquid hydrocarbon media, the verticality error is not greater than 0.02mm, and oil and other media can be controlled within 0.04mm. Figure 1 Example of mechanical seal installation
2. Determine the installation position of the spring seat on the shaft The installation position of the spring seat should be determined on the basis of adjusting the relative position of the rotating shaft and the sealing chamber shell. Begin by correctly drawing a reference line on the pump shaft along the seal chamber end face. Then, according to the seal working length marked on the seal assembly drawing, adjust the compression amount of the spring to the design specified value according to the positioning size of the spring seat. The positioning dimension of the spring seat (see Figure 1) can be obtained by the following formula: Bu003dL—(A+S) In the formula: B—the distance from the back end face of the spring seat to the reference line L—the total height of the working position of the rotating part , Lu003dL'—H; H—spring compression; A—the distance from the end face of the static ring to the end face of the end cover after the static ring is assembled into the sealing end cover; S—the thickness of the gasket of the sealing end cover. 3. Assembly of the rotating parts Put the two ends of the spring (8) in Fig. 1 on the spring seat (9) and the push ring (7) respectively, and make the two ends of the ground flat on the spring seat and the plane on the push ring. close. Then put the moving ring auxiliary sealing ring (5) into the moving ring (4), and combine it with the push ring, and then put the assembled rotating part on the shaft (or shaft sleeve), so that the back end of the spring seat is Aim at the specified position, tighten the screw (10) evenly several times, and press the moving ring backward by hand to see if it can float axially. 4. Installation of static parts components Install the sealed end caps with the installed static parts on the sealed cavity, press the end caps evenly, and do not install biased. Use a feeler gauge to check the gap between the end cap and the end face of the sealed cavity, and the error is not greater than 0.04 mm. Check the radial clearance between the end cover and the static ring to the shaft, and the error of each point along the circumference is not more than 0.1mm.

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