Ventilation yoke, magnetic circuit system and double-sided loudspeaker

The utility model provides a ventilation yoke. The ventilation yoke comprises a bottom plate, a first column body, a second column body and a through hole. The bottom plate comprises a first surface and a second surface which are opposite to each other. The first column extends and protrudes from the first surface. The second column extends and protrudes from the second surface. The through hole penetrates through the bottom plate, the first column body and the second column body. The first column body and the second column body share the bottom plate and can be used for the double-sided loudspeaker, and the number of ventilation yokes used in the double-sided loudspeaker can be reduced. In addition, through the arrangement of the through holes, the LED lamp is communicated with outside air, and the functions of heat dissipation and ventilation are achieved. 本申请提供一种通气轭铁，包括底板、第一柱体、第二柱体以及通孔。底板包括彼此相对的第一表面及第二表面。第一柱体从第一表面延伸凸出。第二柱体从第二表面延伸凸出。通孔贯穿底板、第一柱体及第二柱体。透过配置第一柱体及第二柱体共用底板而能用于双面扬声器，可减少在双面扬声器中所使用的通气轭铁数量。另外，透过通孔的配置