A double-layer drill pipe with internal teeth and external gear coupling

Abstract

The invention discloses an inner embedding tooth and outer gear coupler type double-layer drill rod, which comprises a double-layer drill rod body, wherein the double-layer drill rod body comprises an outer pipe, an inner pipe, an upper joint, a lower joint, an upper sealing ring and a lower sealing ring; the inner pipe and the outer pipe are arranged in the same axial direction; a gap is formed between the inner pipe and the outer pipe; the upper joint is arranged at the upper end of the outer pipe; the lower joint is arranged at the lower end of the outer pipe; the upper joint and the lower joint are respectively and fixedly connected with the outer pipe to form a bearing structure of the drill rod; the upper sealing ring and the lower sealing ring are respectively positioned in the upper joint and the lower joint of the drill rod and are connected with the inner pipe to form an inner layer structure of the drill rod; inner embedding teeth are arranged inside the upper joint along the circumferential direction; outer embedding teeth are arranged outside the lower joint along the circumferential direction; the outer periphery of the upper joint and the outer periphery of the lower joint are provided with outer gears in the same structures; an inner gear sleeve sleeves the outside of the outer gear of the lower joint. The drill rod provided by the invention is used as an engineering drilling machine drill rod, is used for power transmission and airlifting reverse circulation fluid transmission, and has the advantages that the bearing is safe, the fast dismounting can be realized, and the double-layer sealing is reliable.

Description

technical field [0001] The invention belongs to the technical field of large-scale engineering drilling rigs, and in particular relates to a double-layer drilling rod with internal teeth embedded with external gear couplings. Background technique [0002] Drilling rigs for large-scale projects (including vertical shafts) use drill pipes to transmit power, mud walls, compressed air to lift slag, and reverse circulation to wash wells. In the past, there were two main methods of drill pipe connection for large-scale engineering (or shaft) drilling rigs: flange bolt connection and internal hexagonal external tooth connection, both of which can be made into a double-layer drill pipe structure. [0003] Flange-type double-layer drill pipe: double-layer sealing is easy to achieve, but the connecting bolts are prone to fatigue and loosen during drilling, and drill drop accidents often occur; the disassembly of the drill pipe is time-consuming, which seriously affects the drilling ef...

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Problems solved by technology

[0003] Flange-type double-layer drill pipe: double-layer sealing is easy to achieve, but the connecting bolts are prone to fatigue and loosen during drilling, and drill drop accidents often occur; the disassembly of the drill pipe is time-consuming, which seriously affects the drilling efficiency, especially in deep drilling. In the construction of large shafts, the performance is more prominent

[0004] Internal hexagonal and external tooth insert type double-layer drill pipe: adopts hexagonal torsion transmission tooth insert to bear the tensile force, reliable load bearing and convenient disassembly, but the processing technology of the drill pipe joint is poor, and the machining accuracy is not easy to guarantee. In addition, the local stress is large, which is prone to uneven wear Many factors eventually lead to the failure of the high-pressure gas seal, and it is easy to leak air during work. At present, there is no precedent for successful gas sealing of double-layer drill pipe with inner hexagonal outer teeth

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