how to sketch a involute curve for centrifugal pump

I don't believe you can accurately sketch an involute curve; however, you can define it exactly using an equation-driven curve.

The best way to get an involute curve into a sketch is to project it from an external-to-the-sketch feature.

The reference can come from an equation driven edge or curve such as the result of a variable sweep or maybe a equation driven datum curve.

There is a similar problem with making graphs.  Using algebraic functions have to come from external sources, not always parametric either.  Graphs are great for making variable sweep sections using the evalgraph() function.