CN2385180Y

CN2385180Y - Small bore pressure release valve

Info

Publication number: CN2385180Y
Application number: CN 99224209
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 discloses a small bore pressure release valve which is a device arranged on an outer shell of a transformer for releasing pressure of a box. The small bore pressure release valve which is mainly applied to oil-immersed transformers comprises a valve body, a valve head, a sealing ring, a spring, etc. The small bore pressure release l is characterized in that a face which is arranged at the upper part of the valve body and matched with the sealing ring in the valve head is a concave shererical face, and the upper part of a valve body cavity is provided with a valve rod guiding rack, the middle part of which recesses downward and is provided with an oil pass hole; a valve rod at the lower end of the spring is provided with a spring bracket, an adjusting washer, pins, etc., wherein, the spring bracket is provided with a round pin groove; the valve head is provided with an air exhausting handle. The utility model solves the problems of poor sealing performance, large height, little oil pass amount, inconvenient air exhaustion, poor reliability, etc. in the prior art.

Description

A kind of small-bore pressure relief valve

The utility model belongs to a kind of parts of transformer, is mounted in the device that on the transformer case casing internal pressure is discharged, and mainly is applicable to oil immersed transformer, the high-voltage switch gear of also suitable oil or other liquid cooling or insulation and power capacitor etc.

At present; for the superpressure in the oil tank of transformer is discharged; do not damaged with the protection oil tank of transformer; employing is than the small-bore pressure relief valve of advanced configuration; be U. S. Patent 4431023 pressure releasing meanss (United States Patent 4; 431,023 PRESSURE RELIEF), as shown in Figure 1.This pressure releasing means is made up of valve body, valve head, valve rod, seal ring, helical spring, locking frame and locking screw etc.Its deficiency is: 1. the fitting surface through the seal ring sealing is an internal conical surface between valve body and valve head, locate not timing when valve rod valve head is tilted, it is bad to cause the seal ring that is contained on the valve head and being sealed and matched of valve body to contact between the conical surface, therefore, sealing is poor, and reliability is low; 2. because the correcting frame of supported spring upper end and correcting valve rod is one to have the plain washer of oil channel hole, and place the bottom in valve body chamber, this not only makes spring move down, and the oil duct opening area is a lot of less than the valve body bore, therefore, increased its whole height, and logical oil mass is little; 3. because the lower end of spring is length and the support of adjusting spring with two nuts of rotary valve rod bottom, this structure nut easily comes off, so poor reliability; 4. when the gas of superpressure is not arranged in the oil tank of transformer, can not discharge.

The purpose of this utility model is to overcome the deficiency in the above-mentioned prior art, and provides little, the logical oil mass of good seal performance, whole height big, and venting is convenient, the higher a kind of small-bore pressure relief valve of reliability.

The purpose of this utility model can reach by following measure: it comprises valve body, valve head, valve rod, seal ring, spring etc., and its special way is: the face that seal ring is sealed and matched mutually between valve body top inner face and valve head is the spill sphere; The middle part of valve rod saddle is following spill, and is provided with the oil through road that is not less than valve body opening footpath area in concave portions, and its upper end places the top in valve body chamber; Be with the spring bracing of supported spring lower end in the bottom of valve rod; Be provided with the circular trough that valve rod lower end pin is passed in locking in the bottom of spring bracing; Be equipped with the adjustment packing ring that is enclosed within on the valve rod in the circular trough of the spring bracing on pin; On valve head, be provided with the venting handle.

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 the utility model embodiment's plan structure schematic representation;

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

Fig. 1 is the U. S. Patent structural representation.With reference to Fig. 2, Fig. 3.The utility model comprises valve body 4 in the prior art, be contained in the valve head 8 of valve body 4 upper end-hole, be contained on the valve head 8 and with the seal ring 9 of valve body 4 sealings, be located at valve head 8 lower ends valve rod 2, be enclosed within on the valve rod 2 and place valve body 4 chambeies spring 3, be contained in the locking frame 11 above the valve head 4, be screwed on the locking frame 11 and press the screw 12 that pins valve head 8 etc.The utility model also is provided with protective housing 10 on valve head 8.Special way of the present utility model is: the face that is sealed and matched mutually at 8 seal rings 9 of valve body 4 top inner faces and valve head is spill sphere Rs; The middle part of valve rod saddle 6 is following spill, and is provided with the oil through road that is not less than valve body 4 bore areas in concave portions, and its upper end places the top in valve body 4 chambeies; Be with the spring bracing 1 of supported spring 3 lower ends in the bottom of valve rod 2; Be provided with the circular trough that valve rod 2 lower end pins 15 are passed in locking in the bottom of spring bracing 1; Be equipped with the adjustment pad 14 that is enclosed within on the valve rod 2 in the circular trough of the spring bracing 1 on pin 15; Be provided with venting handle 13 in valve head 8 upper ends.When installing, the utility model can and be fixed on the flange seat sealing that transformer case covers by end seal ring 5.

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

Since the utility model face that sealing ring is sealed and matched mutually between valve body top inner face and valve head be The spill sphere has overcome the bad disadvantage of sealing place contact when valve head tilts in the prior art, therefore, Good seal performance, the reliability height;

2. the middle part owing to valve rod saddle of the present utility model is concave, and is provided with not in concave portions Less than the oil through road of valve body opening footpath area, and its upper end places the top in valve body chamber, makes and moves on the spring, Overcome valve rod saddle in the prior art and be the oil through road of plain washer less than bore, and placed the valve body chamber The middle part make that its whole height is big to be waited not enoughly, therefore, whole height is little, logical oil mass is big;

3. because the utility model is provided with spring bracket on the valve rod of spring lower end, and the spring bracket bottom is provided with the circular trough of locking pin, come the power of Regulation spring with the adjustment packing ring, overcome in the prior art and adjusted spring length with nut, the nut that causes easily comes off, and adjust shortcomings such as inconvenience, therefore, further improved reliability;

4. because the utility model is provided with the venting handle on valve head, therefore, venting is convenient.

In a word, the utlity model has good seal performance, highly little, logical oil mass big, exit convenient and reliability advantages of higher.

Claims

1. a small-bore pressure relief valve comprises valve body, valve head, valve rod, seal ring, spring etc., it is characterized in that: the face that seal ring is sealed and matched mutually between valve body top inner face and valve head is the spill sphere;

2. a kind of small-bore pressure relief valve according to claim 1 is characterized in that: the middle part of valve rod saddle is following spill, and is provided with the oil through road that is not less than valve body opening footpath area in concave portions, and its upper end places the top in valve body chamber;

3. a kind of small-bore pressure relief valve according to claim 1 and 2 is characterized in that: the spring bracing that is with the supported spring lower end in the bottom of valve rod;

4. a kind of small-bore pressure relief valve according to claim 3 is characterized in that: be provided with the circular trough that the pin of valve rod lower end is passed in locking in the bottom of spring bracing;

5. a kind of small-bore pressure relief valve according to claim 4 is characterized in that: be equipped with the adjustment packing ring that is enclosed within on the valve rod in the circular trough of the spring bracing on pin;

6. a kind of small-bore pressure relief valve according to claim 5 is characterized in that: be provided with the venting handle on valve head.