Double tooth airtight thread
A gas-sealed and tooth-shaped technology, which is applied to drilling equipment, earthwork drilling, drill pipes, etc., can solve the problems of easily damaged oil and gas seals, failures, etc. buckle effect
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[0020] like figure 1 The shown drill tool has a male joint and a female joint at both ends; the male joint and the female joint are double-tooth air-tight threads, such as figure 2 , image 3 As shown, the thread of the male joint and the female joint is a tapered triangular thread, the tooth angle is 60°, and the internal and external threads have three sealing surfaces respectively: the shoulder surface, the end surface has a 15° angle cone surface seal, the tooth The sealing groove R formed by the convex arc sealing surface and the concave arc sealing surface on the side surface 0 -0.02 and R +0.02 0 , The tooth height of the thread is 3.095mm, the tooth top width is 1.66mm, the pitch is 4 teeth / inch, the taper is 1:6, and the sealing groove R=0.5mm.
[0021] like Figure 4 As shown, under the pretightening force of 9000N.m~12000N.m, the thread pair is tightly screwed. At this time, the gap between the major diameter of the external thread and the major diameter of ...
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