Upper cover subassembly, compressor and indirect heating equipment

The utility model provides an upper cover subassembly, compressor and indirect heating equipment. The upper cover subassembly includes: the lid, the lid has the through -hole, the blast pipe, the exit end of blast pipe passes the through -hole to make the exit end and the both sides that the entry end lies in the lid respectively of blast pipe, the pipeline section of entry end place one side of blast pipe has and is used for falling at least one of making an uproar and expands pipeline section. The exit end of blast pipe passes the through -hole so that the exit end of blast pipe and the both sides that the entry end lies in the lid respectively, and the pipeline section of entry end place one side of blast pipe has and is used for falling at least one expansion pipeline section of making an uproar to make to get into sound wave in the blast pipe and form reflection and cancel each other out in the expansion pipeline section, so as to effectively reduce the blast pipe air current pulsation noise, lengthened the life of blast pipe, and then improved compressor and heat transfer system's operational reliability.