A parametric impeller with straight, flat blades used in centrifugal fans or pumps. Moves air or fluid radially outward from the center. Useful for mechanical design and prototyping.

// Impeller (Flat-bladed)
// A parametric impeller with straight, flat blades used in centrifugal fans or pumps. Moves air or fluid radially outward from the center. Useful for mechanical design and prototyping.
// Categories: Automotive, Aerospace

@settings(defaultLengthUnit = mm, kclVersion = 1.0)

// parameters
bladeCount = 4 // number of blades
outerDiameter = 120 // total impeller diameter
hubOutsideDiameter = 35 // outer diameter of the central hub
boreDiameter = 25 // shaft bore diameter
baseThickness = 5 // thickness of the back plate
hubHeight = 35 // height of cylindrical hub
bladeLength = 80 // radial length of blade (root to tip)
bladeHeight = 40 // vertical height of each blade
bladeThickness = 3 // width (thickness) of each blade


// derived
outerRadius = outerDiameter / 2
bladeRootRadius = hubOutsideDiameter / 2 + (outerDiameter - hubOutsideDiameter) / 4
bladeTipRadius = bladeRootRadius + bladeLength

// blade profile (positioned mid-height)
bladeSketch = startSketchOn(offsetPlane(XY, offset = -bladeHeight / 2))
bladeProfile = startProfile(bladeSketch, at = [bladeRootRadius, 0])
  |> xLine(length = bladeLength)
  |> yLine(length = bladeThickness)
  |> xLine(length = -bladeLength)
  |> close()
blade = extrude(bladeProfile, length = bladeHeight)

// pattern blades around center
blades = patternCircular3d(
  blade,
  axis = [0, 0, 1],
  center = [0, 0, 0],
  instances = bladeCount,
  arcDegrees = 360,
)

// back plate (base disk)
diskSketch = startSketchOn(offsetPlane(XY, offset = -baseThickness / 2))
disk = circle(diskSketch, center = [0, 0], radius = outerRadius)
backPlate = extrude(disk, length = baseThickness)

// hub cylinder
hubSketch = startSketchOn(backPlate, face = END)
hubCircle = circle(hubSketch, center = [0, 0], radius = hubOutsideDiameter / 2)
hub = extrude(hubCircle, length = hubHeight)

// bore cutout
boreSketch = startSketchOn(backPlate, face = START)
boreCircle = circle(boreSketch, center = [0, 0], radius = boreDiameter / 2)
boreCut = extrude(boreCircle, length = -(baseThickness + hubHeight))


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flat-bladed-impeller