Sealing device
A sealing device and sealing ring technology, applied in the components of pumping devices for elastic fluids, non-variable-capacity pumps, machines/engines, etc., can solve the problems of inconvenience, leakage of magnetic fluid, difficult installation and maintenance, etc.
Inactive Publication Date: 2013-10-09
龚祺允
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- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
However, affected by the centrifugal force of the rotating shaft, the conveying medium in the pump tends to infiltrate into the sealed chamber through the gap between the rotating shaft and the pole piece, and the magnetic fluid in the sealed chamber may also leak out through the gap between the rotating shaft and the pole piece.
In addition, conventional ferrofluid sealing devices still have the problems of difficult installation and maintenance
Method used
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Embodiment Construction
[0054] The structural design of the present invention will be further described with reference to the accompanying drawings by way of examples but not limiting embodiments:
[0055] refer to Figures 1 to 7 , shows the sealing device 10 according to the first embodiment of the present invention. The sealing device 10 is installed in a sealing cover 11 to form a shaft seal. There is a liquid seal between the rotating shaft 14 and the pump casing 12 (see image 3 ). In this embodiment, the sealing cover 11 includes an inner end surface 20 and an outer end surface 22 separated along an axis, and the inner end surface 20 is combined with an end portion 24 of the pump casing 12 . The seal cover 11 further includes a shaft hole 26 passing through the outer end surface 22 from the inner end surface 20 along the axis. The shaft hole 26 allows the shaft 14 to pass through and includes an annular enlarged portion 28 adjacent to the outer end surface 22 . The sealing cover 11 further ...
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The invention discloses a sealing device. The sealing device comprises a shaft sleeve, an external ring, a magnetic field generating unit and a seal ring, wherein the external ring is used for the passage of the shaft sleeve; the magnetic field generating unit is arranged in the external ring and surrounds at the exterior of the shaft sleeve, and the magnetic field generating unit comprises an inner magnetic ring and an outer magnetic ring; at least one of the inner magnetic ring and the outer magnetic ring is a magnet; a clearance is reserved between the inner magnetic ring and the outer magnetic ring and is used for filling magnetic fluid; the magnetic field generating unit can generate a magnetic field to keep the magnetic fluid in the clearance; and the seal ring is arranged in the external ring and comprises an outer periphery and an inner periphery which are radially separated, the inner periphery of the seal ring is used for the passage of the shaft sleeve, one end of the inner periphery of the seal ring facing to the external ring extends so as to form an arc lip, and the lip can prevent a conveying medium or cooling fluid on the exterior of the external ring from permeating into the external ring.
Description
technical field [0001] The invention relates to a shaft seal, in particular to a shaft seal structure formed by magnetic fluid. Background technique [0002] It is known to install mechanical seals and / or ferrofluidic seals in pumps to form a seal between the pump casing and the pump shaft. The magnetic fluid seal generally includes a plurality of ring magnets installed in a sealed chamber and sleeved on the rotating shaft. Each magnet is sandwiched between two pole pieces and sleeved on a rotating shaft. The rotating shaft and the pole pieces are made of magnetically conductive materials. As a result, a gap is formed between the outer periphery of the rotating shaft and the inner periphery of the pole piece, and the magnetic fluid is injected into the sealed chamber, and the magnetic fluid fills the gap. The magnetic field lines from the magnet through the pole piece, the rotating shaft and the magnetic fluid form a closed magnetic flux circuit with magnetic force, which k...
Claims
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IPC IPC(8): F04D29/12
Inventor 龚祺允
Owner 龚祺允