Pressure adaptive mechanical seal

Abstract

The invention discloses a pressure self-adaptive mechanical seal device, which relates to the field of mechanical seal devices, and comprises a static ring assembly fixedly connected to the static part of the seal and a dynamic ring assembly that can rotate with the shaft. Discontinuous cavities uniformly distributed in the circumferential direction are processed on the radial side. There are through holes on the lower surface of each cavity. The through holes communicate with the low pressure area. The discontinuous cavities are sealed by sealing rings. According to different sealing conditions, the different The continuous cavity can adopt different structural forms to achieve the best sealing effect. This sealing device well solves the problem of seal end face wearing and tearing failure caused by sealing pressure fluctuations. Its notable feature is that it can adapt to sealing conditions with a wide pressure range. As the pressure of the sealed fluid increases, the bearing capacity of the seal will increase. The enhancement is adaptive.

Description

technical field [0001] The invention relates to the technical field of mechanical sealing devices, and is suitable for sealing devices of rotating shafts of fluid machines such as reactors and pumps, especially for end face sealing of rotating shafts of large vertical equipment. Background technique [0002] Whether the traditional mechanical seal is a contact seal or a non-contact seal, it is generally designed under certain working conditions. If the pressure of the sealed fluid increases, the seal will fail because it cannot withstand excessive pressure. However, in many occasions, the pressure that the seal can withstand is required to have a wide range. For example, the sealing system of the main pump of a nuclear power plant is composed of three different seals, which are arranged in a sealed housing. The first seal is the main seal. It is a hydrostatic pressure type, and under normal working conditions, the pressure can be reduced from 15.51MPa to 0.21MPa. The second...

AI Technical Summary

Problems solved by technology

In engineering practice, after the first-level seal fails, if the second-level seal cannot withstand excessive pressure, the seal will fail

[0004] Based on this situation, it is necessary to seek a mechanical seal device with a wide pressure range to solve the problem of seal failure due to increased pressure.

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