Core structure and sealing principle

The shaft seal adopts an integrated structure design of "dynamic ring+static ring+elastic compensation mechanism+auxiliary seal", with the core centered around "dynamic fitting+adaptive compensation" to achieve efficient sealing. The moving ring rotates synchronously with the rotating shaft, and the stationary ring is fixed to the equipment housing. The sealing surfaces of the two are precisely ground to form a micrometer level bonding gap; The built-in elastic compensation mechanism (such as spring, bellows) provides continuous pre tightening force, ensuring that the sealing surface is always tightly adhered, and can automatically compensate for size changes caused by sealing surface wear, shaft movement, and thermal expansion.

The auxiliary seals are made of heat-resistant and corrosion-resistant elastic materials, and are installed between the moving ring and the shaft, and between the stationary ring and the housing, respectively, to block the side leakage path. For different working conditions, the product has evolved into various structural forms such as comb teeth (labyrinth), carbon ring, and container. The comb teeth reduce pressure through multi-stage gap throttling, utilizing the conversion of kinetic and thermal energy to achieve step-by-step pressure reduction. The steam leakage is controlled within 0.5% to 1% of the rated flow rate; Carbon ring type, with its self-lubricating properties, can automatically compensate for wear and is suitable for medium and low pressure scenarios; Containerized design adopts modular integration to simplify the installation process and improve sealing reliability.

Product series and material compatibility

• （1） Diversified series layout

According to the requirements of the working conditions, the shaft seal forms a product matrix covering the entire scene, accurately matching different equipment and working conditions:

• Single end face series: suitable for general industrial pumps, environmental protection equipment and other scenarios, can transport oil, water, low corrosive acid and alkali media, and can be adapted to fixed material content ≤ 20%;
• Double end series: specially designed for toxic, flammable and other high-risk media, equipped with isolation liquid system to meet the sealing requirements of chemical high-risk processes;
• High temperature and high pressure series: Strengthen structural strength and heat resistance, adapt to equipment such as steam turbines and high-pressure compressors, and can withstand impact loads under high temperature and high pressure;
• Containerized series: Modular integrated design, installation does not require on-site alignment, greatly reducing downtime for maintenance and adapting to the rapid maintenance needs of large pump and valve equipment.
• （2） Accurate material selection

Material selection focuses on precise matching of performance and working conditions: The sealing surface material is selected from silicon carbide (SiC), hard alloy (WC), ceramics, carbon graphite, etc. The hard to hard combination (such as SiC/SiC) is suitable for media containing solid particles, while the hard to soft combination (such as WC/carbon graphite) balances sealing effect and wear resistance; The elastic compensation mechanism uses fatigue resistant materials such as stainless steel and Inconel alloy to ensure stable elasticity during long-term use; The auxiliary seals are made of fluororubber (FKM), polytetrafluoroethylene (PTFE), perfluororubber (FFKM), etc., which are suitable for different temperature and medium scenarios.

The shell and metal components are selected according to the working conditions, such as 304 stainless steel, 316L stainless steel, Hastelloy alloy, etc., to resist strong corrosive media and adapt to harsh environments such as chemical and marine industries.

Core performance advantages

• Strong adaptability to all working conditions: the temperature resistance range covers -50 ℃ to 200 ℃, and some high-temperature models can withstand working conditions above 180 ℃. Low temperature models are suitable for deep cold scenarios below -50 ℃; The pressure resistance range ranges from vacuum to 40 bar, and the balanced design can withstand higher pressures and adapt to equipment of different pressure levels; Excellent chemical corrosion resistance, able to resist most media such as acids, alkalis, hydrocarbons, organic solvents, etc., with only a few special media requiring customized adaptation.
• Long term durability and low maintenance: The sealing surface is precision ground and treated with high wear-resistant materials, which significantly extends the service life compared to traditional seals. A case study of a coal-fired power plant shows that the annual maintenance frequency of this series of shaft seals has been reduced from 6 times to 2 times; Modular design and standardized production make spare parts replacement convenient, and containerized models can be installed without the need for professional personnel, significantly reducing operation and maintenance costs.
• High sealing accuracy: The leakage rate is strictly controlled, and the water medium leakage rate of the single end face model is ≤ 3ml/h, which meets international standards such as API 682. The double end face model can achieve near zero leakage, meeting environmental and safety requirements; The dynamic compensation mechanism can adapt to the radial and axial runout of the shaft, ensuring stable sealing even under equipment vibration conditions.

Application scenarios and quality assurance

The product application scenarios cover all fields of industry: in the petrochemical industry, it is compatible with reaction kettle stirring shafts and medium conveying pumps to resist high-pressure and highly corrosive media; In the power industry, it is used for steam turbine shaft end seals and desulfurization slurry circulation pumps to improve unit efficiency and stability; In the water treatment industry, it is suitable for various types of water supply pumps and sewage pumps to ensure that the medium is transported without leakage; In the pharmaceutical and semiconductor industries, meeting the requirements of clean environment and low pollution, and adapting to special process needs.