Internal-expanding-type tubular busbar intermediate joint

Abstract

The invention discloses an internal-expanding-type tubular busbar intermediate joint which is formed by an intermediate joint, expansion joints, a double-end screw rod, a turbine and a worm. The two ends of the intermediate joint are internally provided with the expansion joints respectively; the two ends of the double-end screw rod are engaged with center threaded holes of the expansion joints respectively; the middle portion of the double-end screw rod is fixedly connected with the turbine; the thread in the worm is engaged with the turbine; the inner wall aperture of the intermediate joint is of a gradually-changing structure, and dimension of the aperture close to the two ends is larger than that the dimension of the middle aperture; and each expansion joint is of a cone structure, and cross section diameter close to the port portion is larger than the cross section diameter close to the double-end screw rod portion. The inner wall aperture of the intermediate joint is designed to be in the gradually-changing structure, so that when the expansion joints expand, the contact area between the expansion joints and the inner wall of the intermediate joint is increased, better conductivity is achieved, and heat is not easy to accumulated; and meanwhile, the stress is large in the span installation process, and thus the joint portion does not sink.

Description

Technical field: [0001] The invention relates to a connection structure of pipe busbars, in particular to an internal expansion type middle joint of pipe busbars. Background technique: [0002] The existing internal expansion type pipe bus intermediate joint is to place an expansion joint at both ends of the intermediate joint, and double-ended screws are respectively fixed on the expansion joints, and then a 5-6mm×50- 60mm hole, when expanding, use a wrench to reach inside the intermediate joint and pull the double-ended screw to move the expansion joint to the center of the intermediate joint to achieve the purpose of expansion. The similar structure has the following disadvantages: (1) The dead wrench extends into the middle joint to pull the double-ended screw, and each rotation angle is small, and it takes a long time to work when tightening; (2) The size of the opening on the surface of the middle joint is relatively large , affect the conduction; (3) When the expansi...

AI Technical Summary

Problems solved by technology

The similar structure has the following disadvantages: (1) The dead wrench extends into the middle joint to pull the double-ended screw, and each rotation angle is small, and it takes a long time to work when tightening; (2) The size of the opening on the surface of the middle joint is relatively large , affect the conduction; (3) When the expansion is tight, the internal contact area between the expansion joint and the intermediate joint is small, and the long-term conductive work is prone to heat generation, causing safety hazards

(4) The existing double-headed screw has no self-locking function, and the weak vibration generated after the tube bus is energized will easily lead to gaps in the contact between the intermediate joint and the tube bus, which will affect the electrical conductivity

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