What about a combined sealing ring structure with an O-ring?
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This type of modular sealing ring uses a H7/g8 sliding fit between the cemented carbide ring and the ring seat. An O-ring made of polytetrafluoroethylene or synthetic rubber is placed between the two mating cylindrical surfaces to prevent leakage of the sealing fluid therebetween, and the cemented carbide ring is combined with the ring seat. A pin is placed at the planar joint between the cemented carbide ring and the ring seat to transmit torque. With this type of combined structure, no combined stresses are generated, nor is there any deformation of the sealing surface of the combined seal ring as a result thereof. However, the number of components in the combined seal ring increases, and it is necessary to drill holes or grooves in the cemented carbide ring, which makes manufacturing more difficult. Additionally, due to the addition of O-rings, the operating temperature of the seal ring is limited.
This combined seal ring structure with an O-ring is mainly composed of three parts: a cemented carbide ring, a ring seat, and an O-ring. 1. **Tungsten carbide ring**: This is the part that comes into contact with the medium to be sealed, and it possesses high hardness and wear resistance. It usually needs to have excellent corrosion resistance. 2. **Ring seat**: The ring seat is used to secure the cemented carbide ring and can be connected to other parts of the equipment. A sliding fit of H7/g8 is typically used between the cemented carbide ring and the ring seat; such a fit allows sufficient movement of the cemented carbide ring on the sealing surface, ensuring good contact between them. 3. **O-ring**: O-rings are typically made of polytetrafluoroethylene (PTFE) or synthetic rubber; they provide excellent sealing properties to prevent leakage of the sealed fluid. When compressed, they can exert a certain amount of preload on the cemented carbide ring, thereby securing the nozzle in place. However, the presence of the O-ring also limits the operating temperature of the sealing ring, as the material of the O-ring determines its heat resistance. The pin installed at the planar joint between the cemented carbide ring and the ring seat is used to transmit torque, ensuring that the cemented carbide ring can rotate together with the ring seat. The advantage of this combined structure is that: – the sealed end face does not deform due to combined stresses. - The fit between the cemented carbide ring and the ring seat ensures a good sealing effect. However, the disadvantages include: - An increase in the number of parts, which increases the difficulty of assembly. - The processing of cemented carbide rings requires additional steps, such as drilling or grooving. - The material of the O-ring limits the operating temperature range of the sealing ring. When designing such modular sealing rings, it is necessary to take into account factors such as application conditions, cost, and maintenance, to ensure that the performance of the sealing rings meets the actual operational requirements. .