CN201352534Y - Locking device of outdoor high-voltage drop-out type fuse cutout - Google Patents

Abstract

The utility model discloses a locking device of an outdoor high-voltage drop-out type fuse cutout, which comprises a fuse cutout seat provided with a locking piece via a locking shaft pin. The locking piece consists of a locking plate and a locking plate shrapnel, the locking plate is fixedly connected with the locking plate shrapnel, and the locking plate is provided with locking shaft pin holes. The locking device of an outdoor high-voltage drop-out type fuse cutout is provided with a set of locking piece on the fuse cutout seat according to the working mechanism of a jet-type fuse cutout, can make the work state of the fuse cutout have sufficient contact pressure by a lever mechanism, and can ensure that fusion welding does not exist between the fuse cutout seat and a fuse holder in the cut-off process of the fuse cutout when a short-circuit current of 16kA is cut off. The reliable drop of the fuse holder is guaranteed, and ultra-large operation force is not needed in the process of switching on and off.

Description

A kind of locking device of outdoor high-voltage drop type fuse

Technical field

The utility model relates to a kind of locking device of outdoor high-voltage drop type fuse, especially relates to the locking device that a kind of connecting-disconnecting function reaches 16kA and above outdoor high-voltage drop type fuse.

Background technology

Fuse is a kind of protection equipment that the protection electric equipment was avoided the short circuit infringement.Its operation principle is when line short or overload, melt in the fuse fusing carrier is melted formation electric arc, and at the drop-down long arc of the effect of elastic body, high arc temperature makes the inner aerogenesis medium of fusing carrier resolve into gas simultaneously, in the fusing carrier pipe, set up very high pressure, free metal gas bleed pipe is made arc extinction outward, thereby cut-off short circuit current, fusing carrier falls under the effect of deadweight automatically simultaneously, forms a visible isolation fracture.The history in existing more than 50 year of the development of China's fuse switch, in early days based on imitative Soviet Union product, the mid-1970s has improved many products from grinding, because of product material and design level are limit, manufacture level improves little, the later stage eighties increases along with introducing with exchange of technology, and product has had tremendous development, has possessed world standard substantially.Because the short circuit interruption ability of fuse improves constantly and good and economic, now accepted and be extensive use of by vast power consumer, nearly 2,000,000 of annual demand.

In recent years along with economic development, growing industrial and agricultural development needs and living standards of the people improve constantly, and the demand of electric energy is multiplied, and the transmission capacity of current China electrical network is deficiency obviously, the phenomenon of power cuts to limit consumption happens occasionally, and is therefore imperative to the further increase-volume of electrical network.Yet along with having produced a new problem after the electrical network increase-volume again, the capacity of short circuit of 10kV circuit has also been brought up to 16kA thereupon.Because its short circuit energy that bears of fuse that connecting-disconnecting function reaches 16kA is bigger 2～3 times than 12.5kA's, for preventing that melting welding does not take place between fuse base and the fusing carrier, contact pressure between fuse base and the fusing carrier also must improve 2～3 times, if be still the operating pressure that adopts conventional method to strengthen touch spring, close in operation so, just need very big operating physical force in the separating brake process.Tradition outdoor high-voltage drop type fuse schematic diagram as shown in Figure 3.

The utility model content

The purpose of this utility model is to provide a kind of to reach 16kA and can guarantee that still the melting welding phenomenon does not take place fuse when above in interrupting process at connecting-disconnecting function for the deficiency that solves above-mentioned technology, guarantee reliably falling of fusing carrier, improve the locking device of the outdoor high-voltage drop type fuse of power supply reliability.

In order to achieve the above object, the locking device of a kind of outdoor high-voltage drop type fuse of the utility model design, it comprises fuse base, it is characterized in that on fuse base, being provided with locking member by the locking pivot pin, locking member is made up of latch and latch shell fragment, latch is fixedlyed connected with the latch shell fragment, is provided with the lock shaft pin-and-hole on latch.

The locking device of the outdoor high-voltage drop type fuse of the utility model design, after being installed on the outdoor high-voltage drop type fuse, in making process, locking member is in relaxed state, this moment fusing carrier just can slip under the very little operating physical force fuse base on touch base, when closing a floodgate certain position, leverage contacts with the latch shell fragment of locking member, leverage promotes the latch shell fragment displacement backward on the locking member in LAP subsequently, and make latch progressively press touch base down, up to closing position.When closing position, product is in normal operating condition, and this moment, locking member played the reduction contact resistance on the one hand, reduced the heating and the loss of product, and melting welding does not take place to guarantee on the other hand that product normally cut-offs when short trouble, and fusing carrier reliably falls.In the separating brake process, locking member release pressure under the effect of leverage at first, fusing carrier this moment touch base on just can fuse base under the very little operating physical force skids off, and finishes separating brake.

The locking device of a kind of outdoor high-voltage drop type fuse of the utility model design, working mechanism according to expulsion fuse, on fuse base, install a cover locking spare additional, and make the operating state of fuse that enough contact pressures can be arranged by leverage, in the time of guaranteeing to cut-off the 16kA short circuit current, melting welding does not take place between fuse base and the fusing carrier in fuse in interrupting process, guarantee reliably falling of fusing carrier, and is closing, do not needing too big operating physical force again in the separating brake process.

Description of drawings

Fig. 1 is the combined floodgate operating state of the utility model embodiment;

Fig. 2 is the locking device structure schematic diagram;

Fig. 3 is traditional outdoor high-voltage drop type fuse structural representation.

Wherein: fuse base 1, locking member 2, fusing carrier 3, leverage 4, locking pivot pin 5, lever pivot pin 6, last touch base 7, latch 21, latch shell fragment 22, lock shaft pin-and-hole 23.

Embodiment

The utility model will be further described in conjunction with the accompanying drawings below by embodiment.

Embodiment 1

As shown in Figure 1 and Figure 2, the outdoor high-voltage drop type fuse of a kind of tight device with lock that present embodiment is described, it comprises fuse base 1, on fuse base 1, be provided with locking member 2 by locking pivot pin 5, locking member 2 is made up of latch 21 and latch shell fragment 22, latch 21 is fixedlyed connected with latch shell fragment 22, is provided with lock shaft pin-and-hole 23 on latch 21.

During installation, locking member 2 is fixed on the fuse base 1 by a locking pivot pin 5, leverage 4 by a lever pivot pin 6 fixedly on the fusing carrier 3, is contacted well by the assurance on electric of leverage 4 and fuse base 1 after locking member 2 will assemble, fusing carrier 3.

In making process, locking member 2 is in relaxed state, this moment fusing carrier 3 just can slip under the very little operating physical force fuse base 1 on touch base 7, when closing a floodgate certain position, leverage 4 contacts with the latch shell fragment 22 of locking member 2, leverage 4 promotes 22 displacements backward of latch shell fragment in LAP subsequently, and makes latch 21 progressively press touch base 7 down, up to closing position.When closing position, product is in normal operating condition, this moment, locking member 2 played the reduction contact resistance, reduce the heating and the loss of product, in the separating brake process, at first under the effect of leverage 4, make latch shell fragment 22 reset latch 21 release pressures, fusing carrier 3 this moment touch base 7 on just can fuse base 1 under the very little operating physical force skids off, and finishes separating brake.When short trouble appearred in system, fusing carrier 3 was at first finished and is cut-off, and extinguish arcs electric current, locking member 2 guarantee that melting welding does not take place product, and fusing carrier 3 reliably falls.

Claims (1)

1, a kind of locking device of outdoor high-voltage drop type fuse, it comprises fuse base (1), it is characterized in that upward being provided with locking member (2) by locking pivot pin (5) at fuse base (1), locking member (2) is made up of latch (21) and latch shell fragment (22), latch (21) is fixedlyed connected with latch shell fragment (22), is provided with lock shaft pin-and-hole (23) on latch (21).

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