Centralizer for wireless MWD instrument

The utility model relates to the technical field of centralizers and discloses a centralizer for a wireless measurement while drilling (MWD) instrument. The centralizer for the wireless MWD instrument comprises a mandrel, an upper sliding sleeve, a lower sliding sleeve, an upper connector, a lower connector and a pulley, wherein a through hole penetrating through the mandrel in the axial direction is formed in the mandrel, an annular installation boss is integrally fixed to the outer wall of the middle of the mandrel, the portion, above the installation boss, of the mandrel and the portion, below the installation boss, of the mandrel are sleeved with the upper sliding sleeve and the lower sliding sleeve respectively, the upper connector is installed on the upper portion of the mandrel, an upper annular groove is formed in the outer wall of the upper portion of the mandrel, an upper jackscrew is fixedly installed on the upper connector corresponding to the upper annular groove, the inner end of the upper jackscrew is located in the upper annular groove, the lower connector is installed on the lower portion of the mandrel, and a lower annular groove is formed in the outer wall of the lower portion of the mandrel. The centralizer for the wireless MWD instrument is reasonable and compact in structure, convenient to use, safe, reliable and easy to manufacture; the centralizer can be fixed in a water hole of a drilling tool in a centralized mode all the time, the water hole of the drilling tool can be filled with the centralizer, and both the centralizing effect and the damping effect are good.