How to design the seal between the rotating part and the stationary part of large-diameter rotating equipment
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For large-diameter rotating equipment such as rotary dryers, how to design the seal between the rotating part and the stationary part? The friction plate seal was originally used, but the effect was not good and it was easily damaged.
It is better to use mechanical seal. Of course, the specific form should be chosen according to the actual situation.
It is not practical to use mechanical sealing for large diameters, and the cost is too high to afford it! Our dryers generally use V-shaped packing.
Use a labyrinth seal, which is low cost and easy to install.
The diameter of 1.2m is sealed by a labyrinth seal and a pair of V-shaped sealing rings. I wonder if you can use it?
When it comes to sealing the rotating and stationary parts of large-diameter rotary equipment, large diameter is not the main contradiction. The main problems are: 1. The rotating part is generally a structural part rolled from a steel plate, and the roundness of the cylinder cannot be as round as that after machining; 2. The rotation of the rotating part is generally supported by a supporting wheel, and the center of rotation fluctuates greatly. Coupled with other reasons, the circumferential jump of the seal is relatively serious, which brings great difficulty to the seal. Mechanical sealing is difficult and costly, or impossible. In addition to the circular runout of the rotary body, there is also the problem of axial movement. Therefore, a labyrinth seal is generally used here. The grinding disc seal is essentially a labyrinth seal. As long as it is handled well, it can generally meet the requirements. If the requirements are higher, an air seal can also be added. This must be determined based on the specific situation. For reference only.