CN2385181Y

CN2385181Y - Pressure release valve

Info

Publication number: CN2385181Y
Application number: CN 99224210
Authority: CN
Inventors: 张俊岩
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-06-21
Filing date: 1999-06-21
Publication date: 2000-06-28
Anticipated expiration: 2009-06-21

Abstract

The utility model relates to a pressure release valve which belongs to a part of a transformer. The pressure release valve which is a pressure release device arranged on an outer shell of a transformer is applied to oil cooled transformers. The pressure release valve comprises a valve seat, a membranous disc, a sealing ring, etc. and is characterized in that a spring for pulling the membranous disc tightly is arranged inside a cavity of the valve seat, and the utility model is also provided with an air exhausting handle and a locking spring for test. The utility model has the advantages of small height and volume, high reliability, etc., and can exhaust air and keep accurate pressure within a certain range in testing.

Description

A kind of pressure relief valve

The utility model belongs to a kind of parts of transformer or claims assembly; be mounted in a kind of pressure protective device on the transformer case; mainly be applicable to oil immersed type or claim oil cooled transformer, also be applicable to on-load tap changers of transformers, high-voltage switch gear, power capacitor of oil-filled type etc.

When preventing that transformer from breaking down,, and adopt pressure relief valve that tank internal pressure is discharged because the hurried expansion of transformer oil damages fuel tank.At present, this pressure relief valve by valve seat and membranous disc and seal ring therebetween, be pressed in spring, the valve rod on the membranous disc or claim marker post and outer cover etc. to constitute; When oil tank of transformer is carried out intensity and experiments of sealing performance, for the membranous disc that prevents pressure relief valve is opened, the closedown structure that is adopted generally is to adopt the upper end that is pressed in the marker post above the membranous disc to be provided with nut or pin, pushes down or lock the closedown structure of membranous disc.Its deficiency is: 1. owing to the spring that compresses membranous disc is contained in above the membranous disc, therefore, this pressure relief valve is bigger at the height of fuel tank outside, and this not only influences the insulation distance with the electric outlet terminal of transformer, and its mounting point also is restricted; 2. because its closedown structure pressure when excessive, make the seal ring between valve seat and membranous disc produce bigger distortion or make membranous disc produce permanent set, when normally using, influence opens accuracy or test back generation oil leakage phenomenon, in the test pressurization, can produce seepage when pressure is too small, therefore, can not provide oil tank of transformer required quantitative within the specific limits pressure when intensity and leakage test.

The purpose of this utility model is to overcome the deficiency in the above-mentioned prior art, and provides height dimension less, can keep boost pressure accurately when oil tank of transformer carries out intensity and leakage test within the specific limits, and deflatable pressure relief valve.

The purpose of this utility model can reach by following technical measures: it comprises valve seat, membranous disc, seal ring, spring etc., its special way is: the top and the membranous disc of valve rod are fixed together, and tension membranous disc and the spring that makes membranous disc and seal by seal ring with valve base chamber place in the valve support chamber above the spring bracket that is contained in stem lower portion; In order making enough logical oil masses to be arranged in the valve support chamber, and membranous disc not to be inclined partially, the middle part of spring bracket is for to be recessed shape to the chamber of valve seat, and is provided with the oil through road thereon, and the chamber lower inner wall of the periphery of spring bracket and valve seat is slidingly matched; In order to make manually exhaust of the utility model, on membranous disc, be provided with the venting handle; For when oil tank of transformer carries out intensity and leakage test, membranous disc is not opened, make seal ring not because of bearing excessive pressure again, the cracking pressure when keeping the utility model to use accurately, on membranous disc, be equipped with the case spring of press mold dish; Case spring can be coil spring or leaf spring etc., the preferred case spring of the utility model is " bow " shape spring, and the one end is fixed on the locking frame inner face, and the other end can move freely along locking frame inner face, and the middle part is pressed on the eye ring seat end face above the membranous disc; For the pin that makes valve rod not be subjected to the effect of tilting force and to insert in its following stomidium does not come off, be with the pin lock tube that the lower end has cotter way or circular trough on the valve rod below spring bracket; In order to adjust the cracking pressure of membranous disc, on the valve rod of spring bracket and pinlock inner room, be with the adjustment packing ring.

The utility model is described in further detail below in conjunction with drawings and Examples:

Fig. 1 is the prior art structural representation;

Fig. 2 is the utility model embodiment's a plan structure schematic representation;

Fig. 3 is the A-A sectional view of Fig. 2;

Fig. 4 is the example structure schematic representation of the utility model spring bracket;

Fig. 5 is the B-B sectional view of Fig. 4.

With reference to Fig. 1～Fig. 5.Seal ring 6 and membranous disc 8a are housed on valve seat 5 successively; The top of valve rod 8b and membranous disc 8a are fixed together, tension membranous disc 8a and make

membranous disc

8a and 5 of the valve seats springs 4 by seal ring 6 sealings place in top valve seat 5 chambeies of the spring bracket 2 that is contained in valve rod 8b bottom.In order to make enough logical oil masses are arranged in valve seat 5 chambeies, even be not less than the logical oil mass of valve seat 5 upper end bores by the oil mass of spring bracket 2, the middle part of spring bracket 2 is for to be recessed shape to the chamber of valve seat 5, and is provided with the oil through road thereon, and the area in oil through road is not less than the area of valve seat 5 upper end bores.In order to make membranous disc 8a under the pulling force of spring 4, membranous disc 8a and valve rod 8b do not tilt, and the periphery of spring bracket 2 and valve seat 5 chamber lower inner walls are slidingly matched.In order to make manually exhaust of the utility model, on membranous disc 8a, be provided with venting handle 7.The venting handle 7 of present embodiment is to be contained on the eye ring seat 8c that is fixed on above the membranous disc 8a.During use, mention venting handle 7, just can mention membranous disc 8a, gas or oil are emitted from

membranous disc

8a and 6 of seal rings.For when oil tank of transformer carries out intensity and leakage test, membranous disc 8a is not opened, seal ring 6 is not out of shape because of bearing bigger pressure, the cracking pressure when keeping the utility model to use accurately, on membranous disc 8a, be equipped with the case spring 9a of press mold dish 8a.Case spring 9a can be cylindrical spring or leaf spring etc.Embodiment's of the present utility model case spring 9a is " bow " shape spring, and on the locking frame 9b inner face that the one end is fixed on be contained on the valve seat 5, the other end can move freely along locking frame 9b inner face, and the centre is pressed on the eye ring seat 8c end face above the membranous disc 8a.Present embodiment has only provided the structural type that case spring uses on a kind of pressure relief valve.This case spring also is applicable to the pressure relief valve of other structure, as long as the pressure of case spring is acted on the membranous disc.For the pin 11 that makes valve rod 8b not be subjected to the effect of tilting force and to insert in its following stomidium does not come off, be with the pin lock tube 1 that the lower end has cotter way or circular trough on the valve rod 8b below spring bracket 2.In order to adjust the opening force of membranous disc 8a, promptly spring 4 is with adjustment packing ring 10 by the pressure that spring bracket 2, pin lock tube 1, pin 11 and valve rod 8b etc. act on 6 of seal rings above membranous disc 8a and the valve seat 5 on the valve rod 8b of 1 of spring bracket 2 and pin lock tube.

Present embodiment adopts mounting flange 12 seal weldings on fuel tank cap at the mounting structure on the oil tank of transformer, valve seat 5 bottoms and mounting flange 12 is threaded togather again, and will seals therebetween by end seal ring 3.

Be not difficult to find out that from above-mentioned the utility model compared with the prior art good effect is as follows:

Since the spring that the utility model will strain membranous disc place in the valve support chamber, and in the middle part of adopting to valve seat The spring(-supported) mount that the chamber is recessed, therefore, height dimension is little, and volume is also little, is convenient to cover at oil tank of transformer Installation;

2. because the utility model is provided with case spring on membranous disc, overcome in the prior art at sign Bar 13 is provided with and easily makes sealing ring produce bigger distortion, impact in the closedown structure of nut or pin 14 The disadvantage such as the inaccurate and seepage of opening pressure during normal the use, therefore, oil tank of transformer carry out intensity and During leakage test, can keep within the specific limits increasing accurately pressure;

3. because the utility model is provided with the venting handle on membranous disc, can manually exits when therefore in oil tank of transformer, gas being arranged, and need not to install again bleed valve;

4. because spring bracket of the present utility model is peripheral and the valve seat lower inner wall is slidingly matched, be with the lower end on the valve rod below spring bracket and have the cotter way or the circular trough pin lock tube of lockable pin, and be equipped with the adjustment packing ring of adjusting cracking pressure, therefore, further improved precision and reliability.

In a word, the utlity model has that height dimension is little, volume is little, can exit, easy to install, and can when transformer carries out intensity and leakage test, keep boost pressure, reliability advantages of higher accurately.

Claims

1, a kind of pressure relief valve, comprise valve seat, membranous disc, seal ring, spring etc., it is characterized in that: the top and the membranous disc of valve rod are fixed together, and tension membranous disc and the spring that makes membranous disc and seal by seal ring with valve base chamber place in the valve support chamber above the spring bracket that is contained in stem lower portion;

2, a kind of pressure relief valve according to claim 1 is characterized in that: the middle part of spring bracket is for to be recessed shape to the chamber of valve seat, and is provided with the oil through road thereon, and the chamber lower inner wall of the periphery of spring bracket and valve seat is slidingly matched;

3, a kind of pressure relief valve according to claim 1 and 2 is characterized in that: be equipped with the venting handle on membranous disc;

4, a kind of pressure relief valve according to claim 3 is characterized in that: the case spring that is provided with the press mold dish on membranous disc;

5, a kind of pressure relief valve according to claim 4, it is characterized in that: case spring is " bow " shape spring, and the one end is fixed on the locking frame inner face, and the other end can move freely along locking frame inner face, and the middle part is pressed on the eye ring seat end face above the membranous disc;

6, a kind of pressure relief valve according to claim 5 is characterized in that: be with the pin lock tube that the lower end has cotter way or circular trough on the valve rod below spring bracket;

7, a kind of pressure relief valve according to claim 6 is characterized in that: be with the adjustment packing ring on the valve rod of spring bracket and pinlock inner room.