CN2445155Y

CN2445155Y - Electric contact pressure release valve

Info

Publication number: CN2445155Y
Application number: CN 00252631
Authority: CN
Inventors: 邵长青
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-10-26
Filing date: 2000-10-26
Publication date: 2001-08-29
Anticipated expiration: 2010-10-26

Abstract

The utility model relates to an electric contact pressure release valve which is a pressure protective device arranged on a transformer case and provided with electric contacts. The electric contact pressure release valve which is mainly used for oil-filling transformers comprises a valve seat, a membranous disc, a sealing ring, a spring, a sign post, etc. The electric contact pressure release valve is characterized in that the sign post is provided with a magnet, and one side of the magnet positioned on the sign post is provided with a reed switch which is matched with the magnet, wherein, the reed switch is fixed in a cylinder cover or other non-magnetic conducting magnets in a sealing mode. The utility model has the advantages of accurate open pressure, simple structure, moisture resistance, correct operations of electrical signals, etc.

Description

The electric contact pressure relief valve

The utility model belongs to a kind of parts of transformer or claims assembly; be mounted in the pressure protective device of a kind of charged contact 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 or other iknsulating liquid etc.

When preventing that transformer from breaking down,, generally adopt pressure relief valve that tank internal pressure is discharged and send electrical signal simultaneously because the hurried expansion of transformer oil damages fuel tank.At present, this pressure relief valve mainly is made up of valve seat and membranous disc and seal ring therebetween, spring, valve rod or the marker post etc. of straining or being pressed on the membranous disc; In order to carry out sending electrical signal when pressure discharges at pressure relief valve, electric contact sensitive switch and toggle mechanism thereof are housed on pressure relief valve.Its deficiency is: 1, because the power of stirring of the toggle mechanism of the pressure relief valve of this charged contact drive sensitive switch action is bigger, influence the accuracy and the complex structure of pressure relief valve opening force; 2, because its sensitive switch does not seal, under water inlet or dampness, easily produce misoperation.

The purpose of this utility model is to overcome the deficiency in the above-mentioned prior art, and the electric contact pressure that a kind of cracking pressure is accurate, simple in structure, moistureproof, electrical signal does not have misoperation relief valve is provided.

The purpose of this utility model can realize by following measure: it comprises valve seat, membranous disc, seal ring, spring, marker post etc., its special way is: magnet is housed on marker post, is positioned at that magnet one side has the reed switch that matches with magnet on the marker post; The reed switch sealing and fixing is at tube cover or other not in the magnet case.

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

Fig. 1 is an a kind of embodiment's of the present utility model plan view;

Fig. 2 is the A-A sectional drawing of Fig. 1;

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

With reference to Fig. 1～Fig. 3.Embodiment of the present utility model is the membranous disc 3 that is contained in inner chamber tension valve seat 1 top of valve seat 1 with spring 10, and is example in a kind of structure that

valve seat

1 and 3 of membranous discs are equipped with seal ring 2.Support 7 is positioned at the top of membranous disc 3, and its lower end is fixed on the valve seat 1.Sheath 8 is housed in the center hole on support 7.The lower end of marker post 9 drop on membranous disc 3 above, sheath 8 is passed in its upper end.Magnet 4 is housed on marker post 9, and magnet 4 one sides that are positioned on the marker post 9 have the reed switch 5 that matches with magnet 4.For moistureproof the utility model is at tube cover or other not in the magnet case 6 with reed switch 5 sealing and fixing.Tube cover or not magnet case 6 be fixed on the support 7.The electric contact plug 11 of reed switch 5 is positioned at a side of support 7, connects with signaling system during for use.

During use valve seat 1 lower seal of the present utility model is fixed on the shell of transformer.When the pressure of transformer case or title fuel tank internal increases to specified value, the seal ring 2 that this pressure promotes above the membranous disc 3 disengaging valve seats carries out pressure release, membranous disc 3 promotes marker post 9 risings simultaneously, magnet 4 on the marker post 9 is switched on or switched off the electric contact of reed switch 5, and sends signal by electric contact plug 11 to the signaling system of transformer.

The utility model also can adopt spring to be pressed in the pressure relief valve of structure above the membranous disc, has no longer described in detail here.

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

1, because the reed switch electric contact signal node that the utility model adopts magnet and matches with it Structure, and do not need to adopt in the prior art the required toggle mechanism of microswitch and the resistance that brings thereof Power, therefore, opening pressure is accurate, simple in structure;

2, because reed switch of the present utility model sealing is fixed on barrel cover or other not in the magnetic conductor, It is existing because of the moist misoperations such as electric short circuit that cause to have overcome in the prior art blow-by such as electric contact Resemble, therefore, moistureproof, signal error-free motion.

In a word, the utlity model has that cracking pressure is accurate, simple in structure, moistureproof, electrical signal does not have advantages such as misoperation.

Claims

1, electric contact pressure relief valve comprises valve seat, membranous disc, seal ring, spring, marker post etc., it is characterized in that: magnet is housed on marker post, is positioned at that magnet one side has the reed switch that matches with magnet on the marker post.

2, electric contact pressure relief valve according to claim 1 is characterized in that: the reed switch sealing and fixing is at tube cover or other not in the magnet case.