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From the end of 2025 to the beginning of 2026, multiple domestic enterprises will intensively release patents related to double end face/double mechanical seal assembly , covering various types of equipment such as mixing kettles, rotary shell pumps, rotary pumps, Roots blowers, and submersible mixers. The core breakthroughs will focus on structural compactness, ease of installation and disassembly, improvement of sealing reliability, and intelligent collaborative control.
1. Background
Double mechanical seals (often referred to as double mechanical seal assembly ) are critical safety components under high-risk, high cleanliness, or high pressure conditions, widely used in fields such as chemical engineering, nuclear power, wastewater treatment, and new energy. It achieves "zero leakage" or "controllable internal leakage" through the design of two independent sealing surfaces and isolation liquid chambers, which is significantly better than single end face sealing. The recent trend of patents and products reflects the urgent demand of the industry for long lifespan, easy maintenance, and high adaptability.
2. Technological progress: new structures and new functions
Integrated design: Integrating the annular protrusion of the transmission sleeve with various sealing structures to simplify the assembly process and improve the sealing stability of the mixing kettle.
Radial double mechanical seal assembly innovation: proposing a "main seal with radial inner and outer distribution+secondary seal" structure, which makes the sealing performance of the rotary pump more stable and has a longer service life.
Internal leakage type high reliability solution: "Mechanical seal for internal leakage type high reliability double end face pump", which ensures long-term reliable operation by controlling the pressure difference between the medium side and the atmosphere side.
Split quick installation technology: a new type of large shaft diameter split seal, which can synchronously tighten the bolts at both ends by driving a knob, greatly reducing downtime for replacement.
Breakthrough in dual effect materials: Introducing dual effect silicone thread sealing tape, solving the problems of low efficiency and limited scenarios in traditional winding sealing, and expanding new paths for non rotating shaft sealing.
3. Application Upgrade: From Device to Standard
Roots blower: Clearly set the double mechanical seal assembly in the "sealing chamber between the wall panel and the shaft" and the "active shaft extension", becoming a standard solution for transporting toxic/flammable gases.
Submersible mixer: The standard requires the installation of dual mechanical seals - an inner seal to prevent oil from entering the motor and an outer seal to prevent medium from entering the oil chamber, and both operate independently.
4. Conclusion
The current dual mechanical seals are moving from "single sealing function" to "system level reliability engineering": more compact in structure, more convenient in installation, more diverse in materials, and more rigid in standards.
