According to the temperature control requirements of a large photoelectric theodolite

a compact multiway fluid joint mechanism with skillful structure is researched and designed. The mechanism research background is introduced and the composition and principle of the mechanism are presented.The feasibility of the structure is verified through calculating the friction resistance torque. Finally

the reasonability of the structural design is verified through the theoretical analysis and experimental results. The experimental results indicate that the mechanism is no leak when the sealing ring made of PTFE combined with the bronze is utilized to seal

and the friction resistance torque is only 1.666 N·m.The mechanism runs reliably and realizes the fluid transmission from static state to the continuous rotated state

which can meet the performance requirements of large photoelectric instrumentations properly.