Magnetic Liquid Seal Structure for Large-Shaft Assembly
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Solution Overview
Problem
Large shaft diameters in magnetic liquid sealing devices make it difficult for the rotation shaft to pass through a housing under magnetic field force, leading to uneven magnetic liquid distribution and reduced pressure resistance.
Innovation Solution
A magnetic liquid sealing device design that includes a housing with a chamber, rotating shaft, pole shoes, permanent magnets, and a rotation ring with a through hole, allowing for adjustment of magnetic poles to reduce magnetic field interference and simplify shaft mounting, featuring a detachable sealing block and sealing rings for improved assembly and tightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a large diameter rotating shaft is used, then the shaft can support higher loads and transmit more power, but it becomes difficult for the shaft to pass through the housing under magnetic field force during assembly
Solution Approach 1:
The housing is divided into two separate parts: a first housing and a second housing. The rotating shaft is assembled through the first housing while the magnetic liquid sealing device is installed in the second housing. This segmentation allows the shaft to be assembled without passing through the entire housing structure, eliminating the magnetic field interference problem that would prevent large diameter shafts from being assembled through a complete housing.
2Power
If the shaft diameter is increased to handle higher loads, then power transmission capability improves, but the magnetic field force becomes insufficient to pull the shaft through the housing during assembly
Solution Approach 1:
The housing structure is segmented into two separate housings that are connected after assembly. This allows the rotating shaft to be installed in the first housing without needing to pass through the second housing where the magnetic liquid sealing device creates magnetic field interference. The shaft can therefore have a larger diameter for higher power transmission while still being easily installable.
3Device complexity
If a conventional single-piece housing is used, then the structure is simple, but the magnetic liquid distribution on adjacent pole teeth becomes uneven and no magnetic liquid seal is formed on some pole teeth
Solution Approach 1:
The housing is segmented into a first housing and a second housing with the magnetic liquid sealing device installed in the second housing. This segmentation allows for better control of magnetic liquid distribution within the sealing chamber, ensuring that magnetic liquid seals are properly formed on all adjacent pole teeth. The separated structure enables optimized positioning of the magnetic liquid and pole teeth arrangement, improving seal reliability.
4Ease of operation
If the housing is split into two parts, then shaft assembly becomes easier and magnetic liquid distribution improves, but the device complexity increases
Solution Approach 1:
The housing is divided into a first housing for shaft assembly and a second housing for the magnetic liquid sealing device. This segmentation simplifies the shaft assembly process by eliminating the need to pass the shaft through magnetic field interference zones. While the housing structure becomes more complex, the segmentation enables modular assembly where the two housing parts can be independently manufactured and assembled, potentially simplifying the overall manufacturing process.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design reduces magnetic field interference and mounting difficulty, ensuring a consistent magnetic liquid seal and enhanced pressure resistance by adjusting magnetic pole arrangements and using sealing rings to prevent leakage.
Implementation Method 1
magnetic liquid being filled between the first pole shoe and the rotating shaft, and magnetic liquid being filled between the second pole shoe and the rotating shaft; a plurality of permanent magnets located in the chamber, located between the first pole shoe and the second pole shoe
Implementation Method 2
the permanent magnet being provided with a first magnetic pole and a second magnetic pole opposite to each other in the axial direction of the rotating shaft
Data Source
AI summary
A magnetic liquid sealing device includes a housing, a rotating shaft, a first pole shoe, a second pole shoe, a plurality of permanent magnets, a rotation ring, and a sealing block. A chamber is defined in the housing including a first housing and a second housing. The rotating shaft passes through and is rotatable. The first pole shoe and the second pole shoe surround the rotating shaft and are spaced apart. The plurality of permanent magnets between the first pole shoe and the second pole shoe are spaced apart. The rotation ring surrounds the rotating shaft and is rotatable. The first housing, the rotation ring, and the second housing define the chamber. The rotation ring on outer sides of the plurality of permanent magnets is defined with a through hole running through the rotation ring. The sealing block in the through hole is detachably connected to the rotation ring.