Assembly skills and size check of light mechanical seal

In the process of using light mechanical seals, it is necessary to assemble and check the size, but in operation, in order to ensure the use efficiency and product quality of the seals, it is necessary to understand them accordingly. .

1. Measure the size of the dynamic ring sealing surface. This data is used to verify the radial width of the dynamic ring. When different conflicting materials are selected, the radial width of the conflicting surface of the hard material should be 1-3mm larger than that of the soft material, otherwise it is easy to form the edges and corners of the end face of the hard material embedded in the soft material. on the end.

2. Check the gap between the dynamic ring and the shaft or the shaft sleeve. The inner diameter of the static ring is usually 1~2mm larger than the shaft diameter. Regarding the dynamic ring, in order to ensure the floatability, the inner diameter is 0.5~1mm larger than the shaft diameter to compensate Vibration and deflection of the shaft, but the gap should not be too large, otherwise the moving ring seal will be stuck and the function of the seal will be damaged.

3. Check the tightness of the mechanical seal. The sealing force we usually talk about is the specific pressure of the end face, and the specific pressure of the end face should be appropriate. If it is too large, it will make the conflicting surface of the seal heat up, accelerate the wear of the end face, and increase the conflicting power; if it is too small, it is easy to leak. The specific pressure of the end face is determined during the design of the seal, and we can only determine it by measuring the tightness of the seal during assembly. The usual measurement method is to measure the vertical distance from the installed static ring end face to the gland end face, and then measure the vertical distance from the movable ring end face to the gland end face. The difference between the two is the tightness of the seal.

4. Measure whether the length of the compensation spring has changed. Changes in the function of the spring will directly affect the specific pressure on the end face of the seal. Under normal circumstances, the length of the spring will be shortened after long-term operation, and the seal of the compensation spring on the moving ring will also be deformed due to centrifugal force.

5. Measure the length of the anti-rotation pin of the static ring and the depth of the pin hole, so as to avoid the pin too long and the static ring cannot be assembled in place. The presence of this condition can damage the seal.

The above are the assembly skills and scale verification standards of light mechanical seals. According to its introduction, the user's operation and later use can be more clearly defined, so as to ensure the efficiency of the seal.