1 / 11

a primer on dynamic sealing

a primer on dynamic sealing. or, how to keep water from messing up all your cool moving contraptions. STATIC. DYNAMIC. DYNAMIC. O-ring (static seal). Specifications and help from Parker O-ring Handbook Male gland seals usually preferable Easier to machine external groove

Samuel
Télécharger la présentation

a primer on dynamic sealing

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. a primer on dynamic sealing or, how to keep water from messing up all your cool moving contraptions M J Stanway

  2. STATIC DYNAMIC DYNAMIC dynamic sealing

  3. O-ring (static seal) • Specifications and help from Parker O-ring Handbook • Male gland seals usually preferable • Easier to machine external groove • Less likely to damage seal during assembly • BUT prone to failure in rotating applications dynamic sealing

  4. FlexiSeal • Specifications and help from Parker Flexi-Seal Handbook • “C” shaped open o-ring with enclosed spring • Used by SeaGrant in thrusters and other reciprocating seals • Sold as “Spring-loaded PTFE seals” in McMaster (pg. 3244) dynamic sealing

  5. FlexiSeal installation • “heel first” 2-part gland seal advisable • Open end of seal faces higher pressure • Easy to machine • Easy to assemble without damaging seal • Other options include step-cut glands with/without snap ring retainer dynamic sealing

  6. Magnetic Coupling • Good for thrusters, not high enough accuracy for positioning actuators • Simple concept, potentially difficult design • COMPLETELY separated from fluid by casing material dynamic sealing

  7. Magnetic Coupling • 2-3 manufacturers make something currently that MIGHT work • WHOI uses them for thrusters on something • Might be able to design and fabricate our own at low cost dynamic sealing

  8. MC Design Considerations • Use neodymium for high strength to volume ratio • Possible source: K&J Magnetics - $7.50 for 100 (1/4 x 1/8 x 1/16) • Even number of magnets, same on inner and outer rotor • Alternate poles around rotors dynamic sealing

  9. MC Design Considerations • Rotor that sits inside in coupling would be wet side • allows for thin wall thickness in endcap between magnets (that part is in tension) • possible quick-disconnect props • Endcap most likely Aluminum dynamic sealing

  10. Other waterproofing • Potting • Solid material • Insulates • Reduction in power • Good for sensors, not actuators • Oil pressure compensation • Can have power loss • System can be bulky & expensive dynamic sealing

  11. Seals in our ROV questions? NOTE: pictures taken from Parker, Magnetic Technologies Ltd, Magnetic Materials and Components, and Bluefin Robotics dynamic sealing

More Related