  We systematically search for magnetic flux rope structures in the solar wind
to within the closest distance to the Sun of 0.13 AU, using data from the third
and fourth orbits of the Parker Solar Probe. We extend our previous magnetic
helicity based technique of identifying magnetic flux rope structures. The
method is improved upon to incorporate the azimuthal flow, which becomes larger
as the spacecraft approaches the Sun. A total of 21 and 34 magnetic flux ropes
are identified during the third (21 days period) and fourth (17 days period)
orbits of the Parker Solar Probe, respectively. We provide a statistical
analysis of the identified structures, including their relation to the streamer
belt and heliospheric current sheet crossing.
