CN101800368B

CN101800368B - Internal expanding centre coupling

Info

Publication number: CN101800368B
Application number: CN201010147771.5A
Authority: CN
Inventors: 钱秋英
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-03-18
Filing date: 2010-03-18
Publication date: 2014-05-07
Anticipated expiration: 2030-03-18
Also published as: CN101800368A

Abstract

The invention discloses an internal expanding centre coupling, which is cylindrical. The diameter of the coupling depends on the thickness and the current-carrying capacity of a bus; a protruding part is arranged in the middle of the coupling; an oblique groove is reserved in the axial direction of the coupling; an expansion pin is inserted into the oblique groove and is connected with a curved screw cap through a screw rod; a curved surface of the expansion pin is trapezoidal; the middle part of the protruding part on the coupling has a bigger diameter than the two ends of the protruding part on the coupling; and the diameter difference depends on the thickness of the bus. When the coupling is used, two ends of the coupling are inserted into the bus by external force; when a screw on the expansion pin is frapped, because the expansion pin is trapezoidal, the expansion pin stretches the oblique groove so that the diameter of the middle part of the oblique groove is increased and the expansion pin is tightly combined with the bus. The internal expanding centre coupling of the invention has the advantages of safe and reliable performances, good conductivity, convenient use, simple operation, cost-saving property and the like and can be widely promoted.

Description

Internal-expansion type transition joint

Technical field:

Patent of the present invention relates to a kind of pipe bus connection structure, relates in particular to that a kind of stress is large, gapless internal-expansion type transition joint between contact-making surface.

Background technology:

Along with scientific and technological progress, and the raising of living standards of the people, power consumption increasing gradually, originally the copper bar bus line in electric power system can not meet the operation of large load current, therefore a kind of novel product---tube type bus has been born, tube type bus has improved load ampacity greatly, yet, numerous pipe bus manufacturing firms all runs into a same difficult problem, that be exactly tube type bus in the middle of the part that connects can not guarantee good electric conductivity, be hem type joint or embedded joint all exist same problem be exactly under bus conduction stress the built on stilts part connecting easily sink, cause the generation gap, place of connection to increase contact resistance.

Summary of the invention:

Patent of the present invention is for above the deficiencies in the prior art, a kind of locking principle that adopts braking automobile is provided, and not only stress is large, and contact area is large, seamless generation between contact-making surface, therefore makes the almost nil internal-expansion type transition joint of contact resistance between tube bus connector.

For realizing the above object, the technical scheme that patent of the present invention adopts is:

Internal-expansion type transition joint, is comprised of joint, skewed slot, expansion pin, screw rod, curved surface nut; Its center tap is cylindric, and diameter is determined according to the size of bus thickness and ampacity, and joint centre is provided with bossing, joint axis to direction have a skewed slot, expansion pin is inserted in joint skewed slot, by screw rod, is connected with curved surface nut; It is characterized in that: skewed slot connects the cylindrical wall of joint in direction axially and radially; It is fan-shaped that the expansion pin cross section vertical with joint longitudinal axis is ring, near the arc limit of curved surface nut, is shorter than the arc limit away from curved surface nut, and curved surface nut is positioned at the space of joint, and the inner core face that curved surface nut can be positioned at skewed slot both sides with joint while tightening screw rod contacts.

The diameter of described joint projection part is greater than the diameter at joint two, has more size and determines according to the thickness of bus.

When patent of the present invention is used by external force by the partial insertion bus of joint two, during screw above tightening up expansion pin, because expansion pin is that trapezoidal shape is large by skewed slot support, cause medial head diameter to become large, itself and bus are combined closely, whole tool has the following advantages: (1) permission power is large, is 1.5 times of ordinary couplings stress through test of many times internal-expansion type joint; (2) contact area is large, because stress is large, therefore in allowing span, mid portion can not sink in installation process, thereby the part connecting does not have gap yet and produces, in addition because internal-expansion type joint need to not slotted on pipe bus, so can not cause because the distortion of bus connector fluting produces gap; (3) easy to operate, owing to only having a screw in the middle of inner intumescence type joint, only need to twist one screw and just can make joint expansion tighten up, played the effect of pulling one hair and move the whole body, saved greatly time and manpower; (4) production cost is little, avoid the fault causing because of manual operation, compare with original hem type joint, internal-expansion type joint has not only guaranteed enough sectional areas but also has saved many unnecessary materials, due to simple to operate, so internal-expansion type joint has also been avoided the contact gap producing because of manual operation carelessness.

Accompanying drawing explanation:

Fig. 1 is patent of invention structural representation;

Fig. 2 is patent of invention generalized section;

Embodiment:

As shown in the figure, internal-expansion type transition joint, by joint 1, skewed slot 2, expansion pin 3, screw rod 4, curved surface nut 5, formed, during concrete enforcement, by external force, joint 1 two is inserted in bus, after inserting, on joint, the part of intermediate projections is equal with bus, when tightening screw rod 4 and tighten up the screw above expansion pin 3, because expansion pin 3 is that trapezoidal shape is large by skewed slot 2 supports, cause transition joint 1 diameter to become large, itself and bus are combined closely.

Patent of the present invention have performance safety reliable, conduct electricity very well, the advantage such as easy to use, simple to operate, cost-saving, there is very large popularizing action.

Claims

1. internal-expansion type transition joint, it is cylindric that joint is, and diameter is determined according to the size of bus thickness and ampacity, joint centre is provided with bossing, joint axis to direction have a skewed slot, expansion pin is inserted in joint skewed slot, by screw rod, is connected with curved surface nut; It is characterized in that: skewed slot connects the cylindrical wall of joint in direction axially and radially; It is fan-shaped that the expansion pin cross section vertical with joint longitudinal axis is ring, near the arc limit of curved surface nut, is shorter than the arc limit away from curved surface nut, and curved surface nut is positioned at the space of joint, and the inner core face that curved surface nut can be positioned at skewed slot both sides with joint while tightening screw rod contacts.

2. internal-expansion type transition joint according to claim 1, is characterized in that: the diameter of described joint projection part is greater than the diameter at joint two, has more size and determines according to the thickness of bus.