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SE-4000 Portable Eye Wash Spray Fixture

SE-4000 Portable Eye Wash Spray Fixture. The Speakman Company University of Delaware Team: Wes Doyle Nate Griffith Matt Jaskot Jason McKnight. Overview. Present the problem State our goals Reveal the project constraints Traverse the design process Reveal the problem solution

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SE-4000 Portable Eye Wash Spray Fixture

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  1. SE-4000 Portable Eye WashSpray Fixture The Speakman Company University of Delaware Team: Wes Doyle Nate Griffith Matt Jaskot Jason McKnight

  2. Overview • Present the problem • State our goals • Reveal the project constraints • Traverse the design process • Reveal the problem solution • Validate the problem solution

  3. Existing design • Complicated and expensive brass valve • Many parts high assembly labor costs • Significant room for cost reduction in spray arms

  4. Current Design Components

  5. Sponsor’s Problem • High cost model in a low cost Market • Seeks to reposition eyewash at appropriate cost level More Features- Higher Cost Low Cost Commodity competition

  6. Our Task • Reduce cost of Spray-Arm Assembly under $15 • Maintain compliance with ANSI flow requirements

  7. Sponsor’s Wants • Utilize existing tank tooling • Aesthetic appeal • Minimize changes to shipping container • One year Return on capital expenditure

  8. ANSI Requirements • Minimum flow of 0.4 GPM for 15 minutes • Hands free operation • Nozzles protected from airborne contaminants • “On to Off” in 1 second or less • Nozzle at least 6” from nearest obstruction • Must not leak & operate reliably every time • Both eyes flushed simultaneously at safe water velocities

  9. Design Subsystems 3 Subsystems Spray-Arms perform: • - Regulation of flow on/off (valve) • - Direction of flow to user’s eyes (nozzles) • - Attachment to tank (threaded nut) • Any new design must perform these 3 functions at low cost • - Attachment to tank and flow direction are relatively easy to do • - Focus on flow regulation

  10. Concept generation - Initial ideas for flow regulation Ball Valve Linear Valve Snap-on Nozzle Caps - Low-cost design easy to prototype quickly, cheaply

  11. Ball Valve Prototype • Estimated Cost ~$30 (ball valve expensive, assembly costs) • One Attachment Point, Low Strength • Ugly.

  12. Pull-Off Caps Prototype • Estimated Cost Near $15 Target • Attached with Bolts / Screws (Stronger) • T-Handle Connected to Caps • Sharp Metal Edges • Plastic Molded Design • (it is a safety product)

  13. Design changes

  14. Design changes

  15. Design changes

  16. Design changes

  17. Design changes

  18. Design changes

  19. Design changes

  20. Design changes

  21. Pull-Off Strap Design • Angled rubber strap • Allows for user to easily grab onto handle • Expensive to mold due to complex shape • Cheaper, effective alternative?

  22. Pull-Off Strap Design • Straight rubber strap • Less expensive mold • Smaller surface area for user to grab onto • $6800 Tooling • $3.50 Piece price • Cheap, ergonomic alternative?...

  23. Pull-Off Strap Design • Inverted rubber strap • Inexpensive • Prominent • Peeling effect • Other alternative? • Widen the space between nozzles for more room

  24. Rapid prototyping/final design • Final Design • Rapid Prototyping using Stereolithography

  25. Cost • Reduced Unit Cost • Cheaper materials • Fewer parts • Easier to assemble

  26. Current/Proposed Design Comparison

  27. Testing • Flow Requirements Met

  28. t = 0 min t = 0 min

  29. t = 1 min t = 1 min

  30. t = 2 min t = 2 min

  31. t = 3 min t = 3 min

  32. t = 4 min t = 4 min

  33. t = 5 min t = 5 min

  34. t = 6 min t = 6 min

  35. t = 7 min t = 7 min

  36. t = 8 min t = 8 min

  37. t = 9 min t = 9 min

  38. t = 10 min t = 10 min

  39. t = 11 min t = 11 min

  40. t = 12 min t = 12 min

  41. t = 13 min t = 13 min

  42. t = 14 min t = 14 min

  43. t = 15 min t = 15 min

  44. t = 16 min t = 16 min

  45. t = 17 min t = 17 min

  46. t = 18 min t = 18 min

  47. t = 19 min t = 19 min

  48. t = 20 min t = 20 min

  49. t = 21 min t = 21 min

  50. t = 22 min t = 22 min

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