CN200969410Y

CN200969410Y - Transformational structure for transformer low-voltage casing tube wiring terminal

Info

Publication number: CN200969410Y
Application number: CN 200620043401
Authority: CN
Inventors: 顾伟
Original assignee: Shanghai Zhixin Electric Co Ltd
Current assignee: Shanghai Zhixin Electric Co Ltd
Priority date: 2006-06-29
Filing date: 2006-06-29
Publication date: 2007-10-31
Anticipated expiration: 2016-06-29

Abstract

The utility model discloses a conversion structure of the transformer low pressure casing wiring bolt which includes a low pressure casing wiring bolt on the transformer cover, a conversion joint arranged on the wiring bolt and a locking nut, the wiring bolt has a screw rod structure, the conversion joint includes a wiring bolt connecting part, which is positioned under the conversion joint and the shape of the connecting part is cylinder, the lower end of the cylinder is arranged with a blind threaded hole which axially extends upwards and coordinates with the outer diameter of the wiring bolt; a conductor connecting part, which is positioned above the conversion joint and is composed by a straight plate extended by the upper end surface of the inner threaded connecting part of the conversion joint. By using the technology scheme, the length of the inner thread of the conversion joint is much longer than the nut, and because the former connecting mode of the screw rod is changed into the copper row connection mode that lessen the current density of the connecting part and correspondingly lessen the calorific value; relative to the traditional holding rod type copper joint, the conversion joint of the utility model is difficult to crack and is much more safer and reliable.

Description

The transformational structure of transformer low voltage conduit connection post

Technical field

The utility model relates to a kind of transformational structure of transformer low voltage conduit connection post.

Technical background

The low-tension bushing binding post is a screw-rod structure on traditional small capacity transformer case lid 1, the user is when wiring, carry out the crimping pad at wire termination, the crimping pad be placed on be enclosed between the packing ring on the screw rod then, again with locking nut with this crimping spacers on low tension terminal.The shortcoming of this mounting structure is that the junction heating is more serious, will pay special attention to the smooth of locking nut contact-making surface during construction, and the oxide-film of screw thread must clean down.In order to improve junction heating situation, now adopt a kind of pole grasp type joint 4 (see figure 1)s, its structure is divided into two parts, its underpart is pole grasp type and is provided with internal thread, screw rod on this internal thread and the low tension terminal 2 closely cooperates, top is that the flat structure that is provided with through wires hole can be used for terminal block, but owing to the screw rod contact portion with low tension terminal is to adopt the locking mode of pole form and bolted, joint and screw rod cooperation place are because the moment when being subjected to bolted and cracking easily influences the normal safe operation of product.

Summary of the invention

So the utility model purpose is overcoming the deficiencies in the prior art, a kind of transformational structure of transformer low voltage conduit connection post is provided, it can improve the current density of lead junction and caloric value is reduced.

The technical scheme that realizes above-mentioned purpose is: a kind of transformational structure of transformer low voltage conduit connection post, comprise the low-tension bushing binding post that transformer tank covers and be arranged on crossover sub and locking nut on the binding post, described binding post is a screw-rod structure, described crossover sub comprises: the binding post connecting portion, be positioned at the bottom of crossover sub, it is shaped as cylinder, be provided with in this cylindrical lower end axially extend upward and with the tapped blind hole of binding post external diameter coupling; Wire interconnecting piece is positioned at the top of crossover sub, and its extended one straight plate of upper surface by described binding post connecting portion constitutes.

The transformational structure of above-mentioned transformer low voltage conduit connection post, wherein, described wire interconnecting piece is vertical with the upper surface of binding post connecting portion.

The transformational structure of above-mentioned transformer low voltage conduit connection post, wherein, described locking nut is located at the bottom of crossover sub.

The transformational structure of above-mentioned transformer low voltage conduit connection post, wherein, the wire interconnecting piece of described crossover sub is provided with perforation.

After having adopted the technical solution of the utility model, with respect to the direct structure that the screw rod of conductor compression jointing pad and low tension terminal is connected, because the internal thread length of crossover sub of the present utility model uses nut much longer than now, the original screw rod connecting mode of reason changes the copper bar connected mode into again, the current density of coupling part is reduced, and caloric value just also correspondingly reduces; With respect to traditional pole grasp type copper sleeve, crossover sub of the present utility model is not easy cracking, and is more safe and reliable.

Description of drawings

Fig. 1 is the structural representation of transformational structure of the transformer low voltage conduit connection post of prior art;

Fig. 2 is the structural representation of the transformational structure of transformer low voltage conduit connection post of the present utility model;

Fig. 3 is the structural representation of the crossover sub in the transformational structure of transformer low voltage conduit connection post of the present utility model.

Embodiment

See also Fig. 2, Fig. 3, the transformational structure of a kind of transformer low voltage conduit connection post of the present utility model, by transformer case lid 1, low-tension bushing binding post 2, locking nut 3 and crossover sub 4, wherein low-tension bushing binding post 2 is fixed on the transformer case lid 1, and binding post 2 is a screw-rod structure.Crossover sub 4 is made of two parts, its underpart is a binding post connecting portion 41, it is shaped as cylinder, be provided with in this cylindrical lower end 410 axially extend upward and with the tapped blind hole 411 of binding post 2 external diameters coupling, the screw thread that relies on crossover sub 4 to carry can make these crossover sub 4 direct spinnings on the screw rod of binding post 2, the top of crossover sub 4 is wire interconnecting piece 42, its upper surface 412 extended one straight plates by binding post connecting portion 41 constitute, this straight plate is preferably vertical with the upper surface 412 of binding post connecting portion 41, central authorities at this straight plate are provided with a perforation 420, can be fastenedly connected with the perforation that bolt passes on perforation 420 and the crimping pad for the crimping pad (not shown) face contact back of wire termination; This crossover sub 4 can adopt the copper material integral cast to form.

For crossover sub 4 and low-tension bushing binding post 2 are connected firmly, a locking nut 3 conduct and caps can be set in the bottom of crossover sub 4.

Above embodiment is only for the usefulness that the utility model is described, but not to restriction of the present utility model, person skilled in the relevant technique, under the situation that does not break away from spirit and scope of the present utility model, can also make various conversion or modification, therefore all technical schemes that are equal to also should belong to category of the present utility model, should be limited by each claim.

Claims

1. the transformational structure of a transformer low voltage conduit connection post comprises the low-tension bushing binding post that transformer tank covers and is arranged on crossover sub and locking nut on the binding post that described binding post is a screw-rod structure, it is characterized in that, described crossover sub comprises:

The binding post connecting portion is positioned at the bottom of crossover sub, and it is shaped as cylinder, be provided with in this cylindrical lower end axially extend upward and with the tapped blind hole of binding post external diameter coupling;

Wire interconnecting piece is positioned at the top of crossover sub, and its extended one straight plate of upper surface by described binding post connecting portion constitutes.

2. the transformational structure of transformer low voltage conduit connection post according to claim 1 is characterized in that described wire interconnecting piece is vertical with the upper surface of binding post connecting portion.

3. the transformational structure of transformer low voltage conduit connection post according to claim 1 is characterized in that described locking nut is located at the bottom of crossover sub.

4. the transformational structure of transformer low voltage conduit connection post according to claim 1 is characterized in that the wire interconnecting piece of described crossover sub is provided with perforation.