Dual-tooth-form gas-tight thread
A gas-sealed and tooth-shaped technology, which is applied in the direction of drilling equipment, earthwork drilling, drill pipe, etc., can solve the problems of easily damaged oil and gas seals, failures, etc., and achieves strong anti-torque ability, good anti-sticking performance, and strong connection strength. high effect
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[0019] Such as 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.
[0020] Such as 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 diame...
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