Centralizer

The embodiment of the utility model relates to the technical field of mechanical oil extraction, and discloses a centralizer and a submersible screw pump unit, the centralizer comprises a first half hoop, a second half hoop and a fastener; the first half hoop comprises a first limiting bulge; the second half hoop comprises a second limiting bulge; the second half hoop is detachably connected to the first half hoop through a fastening assembly, the second half hoop and the first half hoop are matched to define a clamping space, and the clamping space is used for clamping the submersible screw pump unit; the first limiting protrusion and the second limiting protrusion are both used for being arranged on the submersible screw pump unit in a clamped mode. In this way, the working efficiency of the submersible screw pump unit can be improved. In addition, the radial size of the clamping space can be conveniently adjusted, so that the requirements of submersible screw pump units with different sizes are met. 本实用新型实