CN2437026Y

CN2437026Y - Pressure releasing device

Info

Publication number: CN2437026Y
Application number: CN 99225251
Authority: CN
Inventors: 张俊岩
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-10-12
Filing date: 1999-10-12
Publication date: 2001-06-27
Anticipated expiration: 2009-10-12

Abstract

The utility model discloses a pressure releasing device which belongs to a part of a transformer. The pressure releasing device which is mainly suitable for oil-filled transformers and load tapped switches of transformers comprises a base, a release cover, a sealing ring, etc. The pressure releasing device is characterized in that the lower side of the release cover is provided with a bottomed corrugated tube for starting a locking mechanism of the release cover, wherein, the locking mechanism is composed of a locking rod, a locking arm, a locking machine, a locking sleeve, etc. The corrugated tube is provided with a balance spring, and the lower side of the release cover is also provided with a limiting member of the corrugated tube. The utility model solves the defects of high opening pressure, large range, damping existence, non-reusable property, low reliability, high operating cost, etc. of the prior art.

Description

A kind of pressure relief device

The utility model belongs to a kind of parts of transformer ' s type product, is mounted in a kind of pressure relief device on transformer or the on-load tap changers of transformers shell, mainly is applicable to oil-filled transformer and on-load tap changers of transformers.

At present, the pressure relief device that adopts on transformer and on-load tap changers of transformers mainly contains two kinds: a kind of is pressure relief valve, and another kind is the explosion lid that is mainly used in on-load tap changers of transformers.Their purpose is: over pressure is carried out in its inside discharge, be not damaged with protecting sheathing.

Pressure relief valve mainly by valve seat or claim pedestal, on valve seat membranous disc or claim to discharge sealing ring between lid, valve seat and membranous disc, be pressed in spring above the membranous disc, outer cover etc. constitutes.Its weak point is: because in pressure releasing process, spring is being pressed membranous disc all the time, hinders internal liquid or gas and outwards flows, therefore, produce the release of pressure damping, and the release of pressure poor effect, the release of pressure reliability is low when serious accident.

The explosion lid is that the strength weak district of being processed into a circle or annular groove on the case lid of transformer loaded switch constitutes, when its inner overpressure, in the weak area explosion.Its weak point is: 1. because this structure is subjected to the restriction of factors such as machining, case lid material and overall structure, and therefore, release pressure is higher and scope is bigger, reliability is low; 2. because this structure can not be repaired behind the explosion release of pressure, need change case lid again, so product operating cost is higher.

The purpose of this utility model is to overcome the weak point in the above-mentioned prior art, and the unlatching value that provides pressure to discharge is low and scope is little, no release of pressure damping, reusable, reliability is higher, operating cost is lower a kind of pressure relief device.

The purpose of this utility model can reach by following measure; It comprises pedestal, discharge lid, sealing ring etc., and its special character is: discharge face seal under the lid be equipped with start discharge the locking mechanism that covers end bellows arranged; Locking mechanism is by passing that bearing that the locking bar, an end and the pedestal that discharge lid be provided with above flexibly connects and the flange that the other end is provided with by the locking bar upper end pushes down and push down that the hammerlock, the lock machine on locking bar, the lower end that discharge lid place bottom the bellows and the upper end is enclosed within the bottom of locking bar and the lock tube etc. that can pull lock machine constitutes; Be equipped with balancing spring between release lid and lock tube or between the bottom of bellows; Lock machine is to be made of dead bolt and the spring that promotes dead bolt etc.; Be equipped with in the outside of bellows and be fixed on the bellows locating part that discharges below the lid.

The utility model is described in further detail with embodiment with reference to the accompanying drawings:

Fig. 1 is the utility model example structure schematic diagram.

With reference to Fig. 1.The utility model is equipped with to discharge at the internal orifice of pedestal 8 and cover 19,

release cover

19 and 8 of pedestals be equipped with sealing ring 10.The utility model is to cover the bellows 12 that is equipped with the end below 19 through 15 sealings of end sealing ring in release, discharges the element that cover lock is decided mechanism as starting.The locking mechanism of present embodiment mainly is made of following part: locking bar 3 passes to discharge and covers 19, is pressed in to discharge the hammerlock 1 that covers above 19; The bearing 7 usefulness bearing pins 6 that one end of hammerlock 1 and pedestal 8 are provided with above flexibly connect, and the other end is pushed down by flange 4 structures that locking bar 3 upper ends are provided with; On locking bar 3, be provided with by spring 14 and promote the lock machine 5 that dead bolt 18 constitutes; The lower end of lock tube 13 places the bottom of bellows 12, and its upper end is enclosed within the bottom of locking bar 3, and lock tube 13 can be pulled the lock machine 5 that is made of spring 14 and dead bolt 18 etc. when moving up.In the bottom of bellows 12 or lock tube 13 and discharge and cover 19 and be equipped with balancing spring 17.Be equipped with in the outside of bellows 12 with discharging and cover the bellows locating part of fixing below 19 11.In the upper end of locking bar 3 rainproof protective cover 2 is housed also.When the utility model and 16 assemblings of product case lid, also be provided with seal 9.

When the utility model uses, when the product pressure inside surpasses limit value, oil in the product upwards promotes the bottom of bellows 12, drives lock tube 13 and moves up, and makes to be stuck in that to discharge the dead bolt 18 that cover 19 bottoms mobile in locking bar 3, at this moment, locking bar 3 ejects to discharge and cover 19, and hammerlock 1 opens, and discharges to cover 19 and upwards break away from pedestal 8 together with the part of adorning thereon, like this, just realized the pressure in the fuel tank is discharged.

The utility model compared with the prior art, good effect is as follows:

1. because the utility model carries out superpressure release in to transformer or on-load tap changers of transformers fuel tank The time, release caps etc. all are pushed out the bore of pedestal, do not have in the prior art the sort of being pressed in of pressure relief valve release Put the spring that covers, therefore, no release of pressure damping, reliability height;

2. because release pressure of the present utility model determines there is not prior art by bellows and balancing spring Borehole blasting lid is subjected to the restriction of the factors such as the material of machining, case lid and structure and the release pressure height (that causes As between 0.3～0.5Mpa), the disadvantage such as scope is big, therefore, earth pressure release unlatching value is low, scope is little, can Lean on the property height;

3. because the utility model can be contained on the product after the product superpressure is discharged again, overcome existing explosion and covered expendable deficiency, therefore reusable, reduced product operating cost.

Claims

1. pressure relief device comprises pedestal, discharges lid, sealing ring etc., it is characterized in that: discharge face seal under the lid be equipped with start discharge the locking mechanism that covers end bellows arranged.

2. a kind of pressure relief device according to claim 1 is characterized in that: locking mechanism is by passing that bearing that the locking bar, an end and the pedestal that discharge lid be provided with above flexibly connects and the flange that the other end is provided with by the locking bar upper end pushes down and push down that the hammerlock, the lock machine on locking bar, the lower end that discharge lid place bottom the bellows and the upper end is enclosed within the bottom of locking bar and the lock tube etc. that can pull lock machine constitutes.

3. a kind of pressure relief device according to claim 1 and 2 is characterized in that: be equipped with balancing spring between release lid and lock tube or between the bellows bottom.

4. a kind of pressure relief device according to claim 3 is characterized in that: lock machine is to be made of dead bolt and the spring that promotes dead bolt etc.

5. a kind of pressure relief device according to claim 4 is characterized in that: be equipped with in the outside of bellows and be fixed on the bellows locating part that discharges below covering.